CN101883438A - 无线多址通信系统的随机接入 - Google Patents

无线多址通信系统的随机接入 Download PDF

Info

Publication number
CN101883438A
CN101883438A CN2010101292456A CN201010129245A CN101883438A CN 101883438 A CN101883438 A CN 101883438A CN 2010101292456 A CN2010101292456 A CN 2010101292456A CN 201010129245 A CN201010129245 A CN 201010129245A CN 101883438 A CN101883438 A CN 101883438A
Authority
CN
China
Prior art keywords
rach
random access
access channel
user terminal
message
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2010101292456A
Other languages
English (en)
Other versions
CN101883438B (zh
Inventor
J·R·沃尔顿
M·华莱士
J·W·凯彻姆
S·J·海华德
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of CN101883438A publication Critical patent/CN101883438A/zh
Application granted granted Critical
Publication of CN101883438B publication Critical patent/CN101883438B/zh
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0059—Convolutional codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0061—Error detection codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0067—Rate matching
    • H04L1/0068—Rate matching by puncturing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/002—Transmission of channel access control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0669—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different channel coding between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

本发明涉及无线多址通信系统中的随机接入的技术。定义一随机接入信道(RACH)包括“快”RACH(F-RACH)和“慢”RACH(S-RACH)。F-RACH和S-RACH能在不同工作状态下有效地支持用户终端并且采用不同的设计。F-RACH可用于快速接入系统，S-RACH更为稳健并且能在各种工作状态和条件下支持用户终端。F-RACH可由已向系统注册的用户终端使用，并且能通过适当的提前它们的发送定时来补偿它们的往返延迟(RTD)。S-RACH可由可能向系统注册或未向系统注册的用户终端所使用，并且也许能补偿或不能补偿它们的RTD。用户终端可以使用F-RACH或S-RACH或两者来接入系统。

Description

无线多址通信系统的随机接入
本申请是申请号为200380104584.7、国际申请日为2003年10月24日、发明名称为“无线多址通信系统的随机接入”的发明专利申请的分案申请。
根据25U.S.C.§119要求优先权
本申请要求美国临时专利申请第60/421,309号的优先权，后者题为“MIMOWLAN System”，于2002年10月25日提交，被转让给本发明的受让人并且通过引用被完全结合于此。
本申请要求美国临时专利申请第60/432,440号的优先权，后者题为“RandomAccess For Wireless Multiple-Access Communication Systems”，于2002年12月10日提交，被转让给本发明的受让人并且通过引用被完全结合于此。
技术领域
本发明一般涉及数据通信，尤其涉及便于无线多址通信系统中的随机接入的技术。
背景技术
无线通信系统广泛用于提供各类通信，比如语音、分组数据等等。这些系统可以是能通过共享可用的系统资源来支持与多个用户终端通信的多址系统。这种多址系统的例子包括码分多址(CDMA)系统、时分多址(TDMA)系统和频分多址(FDMA)系统。
在多址通信系统中，多个用户终端可能希望在随机时刻接入系统。这些用户终端可能已经或可能未曾向系统注册，可能具有相对于系统定时偏离的定时，可能知道或可能不知道到其接入点的传播延迟。因而，在尝试接入系统的用户终端的传输可能在随机时刻发生，可能在或可能不在接收接入点处适当地时间对齐。接入点会需要检测这些传输以便标识期望接入系统的特定用户终端。
在为无线多址系统设计随机接入方案时遇到各种难题。例如，随机接入方案应使用户终端能以尽可能少的尝试快速接入系统。此外，随机接入方案应该有效并且消耗尽可能少的系统资源。
因此本领域中需要一种无线多址通信系统的有效且高效的随机接入方案。
发明内容
这里提供了便于无线多址通信系统中的随机接入的技术。一方面，定义一随机接入信道(RACH)包括“快”随机接入信道(F-RACH)和“慢”随机接入信道(S-RACH)。F-RACH和S-RACH能在不同工作状态下有效地支持用户终端并且采用不同的设计。F-RACH是有效的，并且可用于快速接入系统，S-RACH更为稳健并且能在各种工作状态和条件下支持用户终端。F-RACH可由已向系统注册的用户终端使用，并且能通过适当的提前它们的发送定时来补偿它们的往返延迟(RTD)。S-RACH可由可能向系统注册或未向系统注册的用户终端所使用，并且也许能补偿或不能补偿它们的RTD。用户终端可以使用F-RACH或S-RACH或两者来接入系统。
下面进一步详述本发明的各个方面和实施例。
附图说明
从结合附图提出的详细描述中，本发明的特征、特性和优点将变得更为明显，附图中相同的参考字符表示相同的元件，其中：
图1示出一无线多址通信系统；
图2示出一时分双工的(TDD)帧结构；
图3A和3B分别示出F-RACH和S-RACH的时隙结构；
图4示出使用F-RACH和/或S-RACH来接入系统的总过程；
图5和6分别示出使用F-RACH和S-RACH来接入系统的过程；
图7A和7B分别示出S-RACH和F-RACH上的示例性传输；
图8示出一接入点和两个用户终端；
图9示出终端处发送数据处理器的框图；
图10A和10B示出发送数据处理器内处理单元的框图；
图11示出终端内发送空间处理器的框图；
图12A示出OFDM调制器的框图；以及
图12B说明了一OFDM码元。
具体实施方式
这里使用单词“示例性”意指“充当示例、实例或说明”。这里描述为“示例性”的任何实施例或设计都不必被视为比其它实施例或设计更为优选或有利。
图1示出支持多个用户的无线多址通信系统100。系统100包括支持多个用户终端(UT)120的通信的多个接入点(AP)110。为了简洁，图1中仅示出两个接入点110a和110b。接入点一般是用来和用户终端通信的固定站。接入点也称为基站或某些其它术语。
用户终端120可以遍布在系统中。各个用户终端可以是能与接入点通信的固定或移动终端。用户终端也称为接入终端、移动站、远程站、用户设备(UE)、无线设备或某些其它术语。各个用户终端可以在任何给定的时刻在下行链路和/或上行链路上与一个或可能多个接入点进行通信。下行链路(即前向链路)是指从接入点到用户终端的传输，上行链路(即反向链路)是指从用户终端到接入点的传输。
图1中，接入点110a通过120f与用户终端120a通信，接入点110b通过120k与用户终端120f通信。系统控制器130耦合到接入点110，并且可以被设计成执行多个功能，比如(1)对耦合到它的接入点进行协调和控制，(2)在这些接入点间路由数据，以及(3)对于和这些接入点所服务的用户终端的接入和通信进行控制。
这里所述的随机接入技术可用于各种无线多址通信系统。例如，这些技术可用于采用以下的系统：(1)用于数据发送的一根或多根天线以及用于数据接收的一根或多根天线，(2)各种调制技术(例如CDMA、OFDM等等)，以及(3)下行链路和上行链路的一个或多个频带。
为了清楚，下面特别为一示例性的无线多址系统描述了随机接入技术。该系统中，各个接入点都装备有用于数据发送和接收的多根(例如四根)天线，各个用户终端可装备有一根或多根天线。
系统还采用正交频分复用(OFDM)，它有效的把总系统带宽分成多个(NF个)正交子带。在一种特殊设计中，系统带宽为20MHz，NF＝64，子带分配到索引-32到+31，各个经变换码元的持续期为3.2微秒，循环前缀为800nsec，各个OFDM码元的持续期为4.0微秒。OFDM码元周期也称为码元周期，它对应于一个OFDM码元的持续期。
系统还为下行链路和上行链路使用单个频带，下行链路和上行链路使用时分双工(TDD)来共享这一共同频带。此外，系统采用了多个传输信道来便于下行链路和上行链路上的数据传输。
图2示出可用于无线TDD多址系统的帧结构200。传输以TDD帧为单位发生，每个TDD帧都覆盖了一特定的时间持续期(例如2毫秒)。每个TDD帧被分成下行链路阶段和上行链路阶段。各个下行链路和上行链路阶段进一步被分成用于多个下行链路/上行链路传输信道的多个分段。
在图2所示的实施例中，下行链路传输信道包括广播信道(BCH)、前向控制信道(FCCH)和前向信道(FCH)，它们分别在分段210、220和230中被发送。BCH用于发送：(1)可用于系统定时和频率捕获的信标导频，(2)可用于信道估计的MIMO导频，以及(3)携带系统信息的BCH消息。FCCH用来发送对RACH的确认以及下行链路和上行链路资源的分配。FCH用来在下行链路上把用户专用的数据分组、寻呼和广播消息等等发送到用户终端。
在图2所示的实施例中，上行链路传输信道包括反向信道(RCH)和随机接入信道(RACH)，它们分别在分段240和250中被发送。RCH用来在上行链路上发送数据分组。RACH由用户终端用来接入系统。
图2所示的帧结构和传输信道在上述临时美国专利申请第60/421,309号中进一步详述。
1.RACH结构
一方面，RACH由“快”随机接入信道(F-RACH)和“慢”随机接入信道(S-RACH)组成。F-RACH和S-RACH被设计成在不同的工作状态下有效地支持用户终端，并且采用不同的设计。F-RACH可由已向系统注册的用户终端使用，并且能通过适当地提前它们的发送定时来补偿它们的往返延迟(RTD)，如下所述。S-RACH可由已捕获了系统频率(例如通过在BCH上发送的信标导频)但可能已向或未向系统注册的用户终端使用。在S-RACH上发送时，用户终端可能补偿或可能不补偿它们的RTD。
表1总结了F-RACH和S-RACH的要求和特征。
表1
  RACH类型   描述
  F-RACH   由以下类型的用户终端用于系统接入：(1)已向系统注册，(2)能补偿它们的往返延迟，以及(3)能实现所需的接收信噪比(SNR)，为F-RACH使用一分时隙的Aloha随机接入方案。
  RACH类型   描述
  S-RACH   由不能使用F-RACH的用户终端用于系统接入，例如因为未能满足
 使用F-RACH的任一要求。为S-RACH使用一Aloha随机接入方案。
为F-RACH和S-RACH使用了不同的设计来便于在可能时快速接入系统，并且使实现随机接入所需的系统资源量最小。在一实施例中，F-RACH使用一较短的协议数据单元(PDU)，采用较弱的编码方案，并且要求F-RACH PDU近似时间对齐地到达接入点处。在一实施例中，S-RACH使用较长的PDU，采用较强的编码方案，并且不要求S-RACH PDU时间对齐地到达接入点处。F-RACH和S-RACH的设计以及它们的用途在下面详细描述。
在一典型的无线通信系统中，各个用户终端将其定时与系统的定时对齐。这通常通过从接入点接收带有或嵌有定时信息的传输(例如在BCH上发送的信标导频)来实现。然后，用户终端基于接收到的定时信息设置其定时。然而，用户终端定时相对于系统定时偏离，其中偏离量一般对应于包含定时信息的传输的传播延迟。如果用户终端此后使用其定时进行发送，则接入点处接收到的传输被有效地延迟了两倍的传播延迟(即往返延迟)，其中一个传播延迟用于用户终端定时和系统定时之间的差异或偏离，另一传播延迟用于从用户终端到接入点的传输(见图7A)。为使一传输基于接入点定时在特定的瞬时到达，用户终端会需要调节其发送定时以补偿到接入点的往返延迟(见图7B)。
如这里所使用的，RTD补偿的传输是指以这样的方式被发送的传输：使其基于接收机定时在指定的瞬时到达接收机处。(可能存在一些误差，因此可以接近于但不必要完全在指定的瞬时接收到传输。)如果用户终端能将其定时与系统定时对齐(例如两者的定时都基于GPS时间获得)，则RTD补偿的传输仅会需要弥补从用户终端到接入点的传播延迟。
图2还示出RACH的结构的一实施例。在该实施例中，RACH分段250被分成三个分段：F-RACH的分段252、S-RACH的分段254以及保护分段256。F-RACH分段在RACH分段中是第一个，因为F-RACH上的传输经RTD补偿，因此不会干扰前面的RCH分段中的传输。S-RACH分段其次出现在RACH分段中，因为S-RACH上的传输未经RTD补偿，并且如果放在首位则会干扰前面的RCH分段中的传输。保护分段跟在S-RACH分段后，并且用于阻止S-RACH传输干扰下一TDD帧中BCH的下行链路传输。
在一实施例中，F-RACH和S-RACH两者的配置都能由系统为每个TDD帧动态地定义。例如，可以为每个TDD帧单独定义RACH分段的起始位置、F-RACH分段的持续期、S-RACH分段的持续期以及保护间隔。F-RACH和S-RACH分段的持续期可以基于各种因素选择，例如所注册的/未注册的用户终端数目、系统负载等等。为各个TDD帧传送F-RACH和S-RACH配置的参数可以通过在同一TDD帧内发送的BCH消息被发送到用户终端。
图3A示出可用于F-RACH的时隙结构300的一实施例。F-RACH分段被分成多个F-RACH时隙。每个TDD帧内可用的特定F-RACH时隙数目是一可配置的参数，它在同一TDD帧内发送的BCH消息中被传送。在一实施例中，各个F-RACH时隙具有一固定的持续期，它被定义为等于例如一个OFDM码元周期。
在一实施例中，一个F-RACH PDU可以在每个F-RACH时隙内被发送。F-RACH PDU包括一参考部份，它与一F-RACH消息多路复用。F-RACH参考部分包括在一组子带上被发送的一组导频码元，F-RACH消息包括在另一组子带上发送的一组数据码元。导频码元可用于信道估计和数据解调。下面进一步描述子带多路复用、F-RACH PDU的处理、以及用于系统接入的F-RACH操作。
表2列出一示例性F-RACH消息格式的各个字段。
表2-F-RACH消息
  字段名   长度(比特)   描述
  MAC ID   10   分配给用户终端的临时ID
  尾比特   6   卷积编码器的尾比特
媒介访问控制(MAC)ID字段包含标识发送F-RACH消息的特定用户终端的MAC ID。每个用户终端在通信会话开始时向系统注册，并且被分配到一个唯一的MAC ID。这个MAC ID此后用于在会话期间标识用户终端。尾比特字段包括一组零值，用于在F-RACH消息的末端将把卷积编码器重置为已知状态。
图3B示出可用于S-RACH的时隙结构310的实施例。S-RACH分段还被分成多个S-RACH时隙。可用于每个TDD帧的S-RACH时隙的特定数目是一个可配置的参数，该参数在同一TDD帧中发送的BCH消息内被传送。在一实施例中，每个S-RACH时隙具有一个固定的持续时间，该持续时间被定义为等于例如四个OFDM码元周期。
在一实施例中，一个S-RACH PDU可以在每个S-RACH时隙内被发送。S-RACH PDU包括一参考部份，后面跟着一S-RACH消息。在一特定的实施例中，参考部份包括两个导频OFDM码元，它们便于捕获和检测S-RACH传输以及帮助对S-RACH消息部份进行相干解调。导频OFDM码元可如下生成。
表3列出一示例性S-RACH消息格式的各个字段。
表3-S-RACH消息
  字段名   长度(比特)   描述
  MAC ID   10   分配给用户终端的临时ID
  CRC   8   S-RACH消息的CRC值
  尾比特   6   卷积编码器的尾比特
对于表3所示的实施例，S-RACH消息包括三个字段。MAC ID和尾比特字段如上所述。S-RACH可由未注册的用户终端用于系统接入。对于未注册的用户终端进行的第一次系统接入，尚未把唯一的MAC ID分配给用户终端。该情况下，在分配唯一的MAC ID以前，为注册目的保留的注册MAC ID可由未注册的用户终端使用。注册MAC ID是一特定的值(例如0x0001)。循环冗余校验(CRC)字段包含S-RACH消息的一CRC值。该CRC值可由接入点用来确定接收到的S-RACH消息是被正确解码还是被错误解码。因此，CRC值用来使不正确地检测到S-RACH消息的可能性最小。
表2和3示出F-RACH和S-RACH消息的格式的特定实施例。也可以为这些消息定义具有较少、附加和/或不同字段的其它格式，这在本发明的范围内。例如，可以定义S-RACH消息包括一时隙ID字段，该字段带有其中发送S-RACH PDU的特定S-RACH时隙的索引。举另一个例子，F-RACH消息可以被定义为包括一CRC字段。
图3A和3B示出F-RACH和S-RACH的特殊结构。也可以为F-RACH和S-RACH定义其它结构，这在本发明的范围内。例如，F-RACH和/或S-RACH可以被定义为具有可配置的时隙持续期，所述时隙持续期可在BCH消息中被传送。
图3A和3B还示出F-RACH和S-RACH PDU的特定实施例。也可以定义其它PDU格式，这在本发明的范围内。例如，也可以为S-RACH PDU使用子带复用。此外，各个PDU的部份可以被定义为具有不同于上述的尺寸。例如，S-RACH PDU的参考部份可以被定义为仅包括一个导频OFDM码元。
F-RACH和S-RACH用于随机接入能提供各种好处。首先，通过把用户终端分隔成两组能实现改进的效率。满足定时和接收到的SNR要求的用户终端能使用更为有效的F-RACH进行随机接入，全部其它用户终端都能被S-RACH支持。F-RACH可以向分时隙的Aloha信道那样工作，该分时隙的Aloha信道已知比未分实现的Aloha信道的效率近似高两倍。不能补偿其RTD的用户终端可以被限制为S-RACH，并且不会干扰F-RACH上的用户终端。
其次，可以为F-RACH和S-RACH使用不同的检测阈值。这一灵活性使系统能实现不同的目标。例如，F-RACH的检测阈值可以被设为高于S-RACH的检测阈值。于是，这使系统能有助于经由F-RACH更有效地(即具有较高的接收SNR)接入系统的用户终端，能提供较高的总系统吞吐量。S-RACH的检测阈值可以被设得较低，以便使全部用户终端(具有特定的最小接收SNR)都能接入系统。
其三，可以为F-RACH和S-RACH使用不同的设计和PDU。对于上述特定实施例，F-RACH PDU由一个OFDM码元组成，S-RACH PDU由四个OFDM码元组成。不同的PDU尺寸是由于F-RACH的用户和S-RACH的用户所发送的不同数据，也是由于F-RACH和S-RACH的不同编码方案和所需的接收SNR。总的来说，F-RACH会比S-RACH效率近似高八倍，其中因子4源自于较短的PDU尺寸，因子2源自于F-RACH的分时隙特性。因此，对于同一分段持续期，F-RACH能支持八倍于S-RACH的用户终端数目。从另一个角度来看，持续期为S-RACH分段的1/8的F-RACH分段能支持相同数量的用户终端。
2.随机接入过程
用户终端可以使用F-RACH或S-RACH或其两者来接入系统。首先，未向系统注册的用户终端(即未分配到唯一MAC ID的用户终端)使用S-RACH来接入系统。一旦已注册，用户终端就可以使用F-RACH和/或S-RACH进行系统接入。
由于为F-RACH和S-RACH使用了不同的设计，因此成功检测到F-RACH上的传输要求比S-RACH上传输所需的接收SNR更高的接收SNR。为此，不能以足够的功率电平发送以实现F-RACH所需的接收SNR的用户终端缺省会使用S-RACH。此外，如果未能在F-RACH上一指定数量的连续尝试后接入系统，则它也缺省会使用S-RACH。
图4示出用户终端使用F-RACH和/或S-RACH来接入系统所执行的过程400的实施例流程图。首先，确定用户终端是否向系统注册(步骤412)。如果回答为都，则使用S-RACH进行系统接入，过程前进到步骤430。否则，接着确定为用户终端实现的接收SNR是否大于或等于F-RACH所需的接收SNR(即F-RACH阈值SNR)(步骤414)。如果用户终端的接收SNR未知则跳过步骤414。如果步骤414的回答为否，则过程也前进到步骤430。
如果用户终端已注册并且满足F-RACH阈值SNR，则执行F-RACH接入过程以尝试接入系统(步骤420)。在F-RACH接入过程完成后(其实施例在下面图5所述)，确定接入是否成功(步骤422)。如果回答为是，则宣布接入成功(步骤424)，该过程终止。否则，过程前进到步骤430以尝试经由S-RACH接入。
如果终端未注册、不能实现F-RACH阈值SNR或者在经由F-RAHC接入时不成功，则它执行S-RACH接入过程来尝试接入系统(步骤430)。在S-RACH接入过程完成后(其实施例如下面图6所述)，确定接入是否成功(步骤432)。如果回答为是，则宣布接入成功(步骤424)。否则，宣布接入失败(步骤434)。在任一情况下，过程都终止。
为了简洁，图4所示的实施例假定用户终端具有有关它是否向系统注册的最新RTD信息。如果用户终端是静止的(即处在固定站)或如果无线信道没有怎么改变得，则这一假设一般是实际的。对于移动的用户终端，RTD可能在系统接入间显著地变化，或者可能在接入尝试间显著地变化。因此，可以修改过程400以包括确定用户终端是否有最新的RTD信息的步骤。这一确定可以基于以下作出，例如：自上一次系统接入逝去的时间、在上一次系统接入期间观察到的信道行为、等等。
通常，有多类随机接入信道可供使用，首先基于用户终端的工作状态来选用一随机接入信道。工作状态可由以下定义，例如：用户终端的注册状态、接收SNR、当前的RTD信息等等。用户终端可以为系统接入使用多个随机接入信道，每次使用一个信道。
A.F-RACH过程
在一实施例中，F-RACH使用一分时隙的Aloha随机接入方案，借此用户终端在随机选择的F-RACH时隙中发送以尝试接入系统。假定用户终端在F-RACH上发送时具有当前的RTD信息。结果，假定F-RACH PDU在接入点处与F-RACH时隙边界时间对齐。这能大大简化检测过程并且缩短用户终端的接入时间，这能满足使用F-RACH的要求。
在获得接入或者超过最大允许的接入尝试次数以前，用户终端可以在F-RACH上发送多个传输。可以为每个F-RACH传输改变各种参数以提高成功的概率，如下所述。
图5示出用户终端使用F-RACH来接入系统所执行的过程420a的实施例流程图。过程420a是图4中步骤420中执行的F-RACH接入过程的一实施例。
在F-RACH上的第一次传输以前，用户终端初始化用于F-RACH上传输的各个参数(步骤512)。这种参数可以包括例如：接入尝试次数、初始发送功率等等。可以维持一计数器来对接入尝试次数进行计数，对于第一次接入尝试，该计数器可以被初始化为1。初始发送概率的设置使得预期能在接入点处实现F-RACH所需的接收SNR。初始发送概率可以基于用户终端处所度量的接入点的接收信号强度或SNR来估计。然后该过程进入循环520。
对于F-RACH上的每个传输，用户终端都处理BCH以便获得当前TDD帧的相关系统参数(步骤522)。如上所述，每个TDD帧内可用的F-RACH时隙数目以及F-RACH分段的起始是可配置的参数，它们会随着帧的改变而改变。当前TDD帧的F-RACH参数从同一帧内发送的BCH消息中获得。然后，用户终端随机地选择可用的F-RACH时隙之一以便把F-RACH PDU发送到接入点(步骤524)。用户终端接着发送F-RACH PDU以补偿RTD，使得PDU到达接入点处时与所选F-RACH时隙的起始近似时间对齐。
接入点接收并处理F-RACH PDU、恢复所封装的F-RACH消息、并且确定所恢复的消息中包括的MAC ID。对于表2所示的实施例，F-RACH消息不包括一CRC值，因此接入点不能确定消息是被正确解码还是被错误解码。然而，由于仅仅注册的用户终端才使用F-RACH进行系统接入，并且由于每个注册的用户终端都分配到一唯一的MAC ID，因此接入点会依据所分配的MAC ID来校验接收到的MAC ID。如果接收到的MAC ID是所分配的MAC ID之一，则接入点确认接收F-RACH PDU的接收。该确认可以各种方式发送，如下所述。
在发送F-RACH PDU之后，用户终端确定是否为所发送的PDU接收到确认(步骤528)。如果回答为是，则用户终端转变为活动状态(步骤530)，过程终止。否则，如果在指定数目的TDD帧内没有为所发送的F-RACH PDU接收到确认，则用户终端假定接入点未曾接收到F-RACH PDU并且继续F-RACH上的接入过程。
对于每次后续的接入尝试，用户终端首先更新F-RACH传输参数(步骤534)。更新可能需要(1)对于每次后续的接入尝试将计数器增一，以及(2)调节发送功率(例如将其提高一特定数量)。然后基于更新后的计数器值来确定是否超出F-RACH上最大允许的接入尝试次数(步骤536)。如果回答为是，则用户终端保持在接入状态(步骤538)，过程终止。
如果未超出最大允许的接入尝试次数，则用户终端确定在为下一次接入尝试发送F-RACH PDU之前需要等待的时间量。为了确定该等待时间，用户终端首先确定下一次接入尝试要等待的最大时间量，也称为争用窗(CW)。在一实施例中，争用窗(以TDD帧为单位)对于每次接入尝试呈指数增长(即CW＝2access_attempt)。争用窗也可以基于接入尝试次数的某些其它函数(例如线性函数)来确定。然后在零和CW之间随机选择下一次接入尝试要等待的时间量。用户终端在为下一次接入尝试发送F-RACH PDU之前会等待该时间量(步骤540)。
在等待了随机选择的等待时间后，用户终端通过处理BCH消息再次为当前TDD帧确定F-RACH参数(步骤522)，随机选择一F-RACH时隙进行传输(步骤524)，并且在随机选择的F-RACH时隙中发送F-RACH PDU(步骤526)。
F-RACH接入过程继续，直到以下任一发生：(1)用户终端从接入点接收一确认，或者(2)已经超出最大允许的接入尝试次数。对于每个后续的接入尝试，可以如上所述地选择在发送F-RACH PDU前要等待的时间量、要为F-RACH传输使用的特定F-RACH时隙、以及F-RACH PDU的发送功率。
B.S-RACH过程
在一实施例中，S-RACH使用一Aloha随机接入方案，借此用户终端在随机选择的S-RACH时隙中发送以尝试接入系统。即使用户终端尝试在特定的S-RACH时隙上进行发送，也没有假定用于S-RACH上传输的发送定时经RTD补偿。结果，在用户终端没有其RTD的良好估计时，S-RACH的行为类似于未分时隙的Aloha信道的行为。
图6示出用户终端使用S-RACH来接入系统所执行的过程430a的实施例流程图。过程430a是在图4的步骤430中执行的S-RACH接入过程的实施例。
在S-RACH上的第一次传输以前，用户终端初始化用于S-RACH上传输的各个参数(例如接入尝试次数、初始发送功率等等)(步骤612)。然后该过程进入循环620。
对于S-RACH上的每个传输，用户终端处理BCH来为当前TDD帧获得S-RACH的相关参数，比如可用的S-RACH时隙数目以及S-RACH分段的起始(步骤622)。用户终端接着选择可用的S-RACH时隙之一来发送一S-RACH PDU(步骤624)。S-RACH PDU包括具有表3所示字段的S-RACH消息。RACH消息或包括所分配的MAC ID，或者如果用户终端向系统注册则包括注册MAC ID。然后，用户终端在所选的S-RACH时隙中把S-RACH PDU发送到接入点(步骤626)。如果用户终端获悉RTD，它就能相应地调节其发送定时以弥补RTD。
接入点接收并处理S-RACH PDU、恢复S-RACH消息、并且使用消息中包括的CRC值来校验所恢复的消息。如果CRC失败，接入点就丢弃S-RACH消息。如果CRC通过，接入点就获得所恢复的消息中包括的MAC ID，并且确认S-RACHPDU的接收。
在发送S-RACH PDU之后，用户终端确定是否已经为所发送的PDU接收到确认(步骤628)。如果回答为是，用户终端就转变为活动状态(步骤630)，过程终止。否则，用户终端假定接入点未曾接收到S-RACH PDU并且在S-RACH上继续接入过程。
对于每次后续的接入尝试，用户终端首先更新S-RACH传输参数(例如递增计数器、调节发送功率等等)(步骤634)。然后确定是否超出S-RACH上的最大允许的接入尝试次数(步骤636)。如果回答为是，则用户终端会保持在接入状态(步骤638)，过程终止。否则，用户终端确定在为下一接入尝试发送S-RACH PDU以前要等待的时间量。等待时间如上为图5所述地确定。用户终端会等待该时间量(步骤640)。在等待了随机选择的时间后，用户终端通过处理BCH消息再次为当前TDD帧确定S-RACH参数(步骤622)，随机选择用于传输的S-RACH时隙(步骤624)，并且在随机选择的S-RACH时隙中发送S-RACH PDU(步骤626)。
上述S-RACH接入过程继续，直到以下的任一发生：(1)用户终端从接入点接收一确认，或者(2)已经超出最大允许的接入尝试次数。
C.RACH确认
在一实施例中，为了确认正确接收到的F/S-RACH PDU，接入点在BCH消息中设置一F/S-RACH确认比特，并且在FCCH上发送一RACH确认。可以为F-RACH和S-RACH分别使用分开的F-RACH和S-RACH确认比特。在BCH上设置F/S-RACH确认比特和在FCCH上发送RACH确认之间存在延迟，它可以用来弥补调度延迟等等。F/S-RACH确认比特阻止用户终端重试并允许不成功的用户终端快速重试。
在用户终端发送F/S-RACH PDU后，它监视BCH和FCCH以确定其PDU是否已被接入点接收。用户终端监视BCH以确定是否设置了相应的F/S-RACH确认比特。如果设置了该比特，这表明可以在FCCH上为这个和/或某些其它用户终端发送确认，则用户终端进一步对RACH确认处理FCCH。否则，如果未设置该比特，则用户终端继续监视BCH或继续其接入过程。
FCCH用来传送成功接入尝试的确认。每个RACH确认包含与为其发送确认的用户终端相关联的MAC ID。可以使用快速确认来通知用户其接入请求已被接收但与FCH/RCH资源的分配不相关联。基于分配的确认与FCH/RCH分配相关联。如果用户终端在FCCH上接收一快速确认，它转变为休眠状态。如果用户终端接收一基于分配的确认，它获得与确认一起发送的调度信息，并且开始根据系统的分配使用FCH/RCH。
如果用户终端正在执行注册，它就使用注册MAC ID。对于未注册的用户终端，RACH确认会指示用户终端开始与系统的注册过程。通过注册过程，基于例如对于系统中每个用户终端唯一的电子序列号(ESN)来确定用户终端的唯一标识。然后，系统会向用户终端分配唯一的MAC ID(例如通过在FCH上发送的MAC ID分配消息)。
对于S-RACH，所有未注册的用户终端都使用相同的注册MAC ID来接入系统。因此，多个未注册的用户终端可能巧合地在同一S-RACH时隙中发送。该情况下，如果接入点能检测到该S-RACH时隙上的传输，系统就会(未知地)同时与多个用户终端开始注册过程。通过注册过程(例如通过为这些用户终端使用CRC和唯一的ESN)，系统将能解决冲突问题。一个可能的结果是，系统也许不能正确地接收来自这些用户终端的任一个的传输，因为它们彼此干扰，该情况下用户终端可以重启接入过程。或者，系统也许能正确地接收来自最强用户终端的传输，该情况下较弱的用户终端可以重启接入过程。
D.RTD确定
来自未注册的用户终端的传输不能对RTD补偿，并且在到达接入点时与S-RACH时隙边界不对齐。作为接入/注册过程的一部分，确定RTD并将其提供给用户终端，供后续的上行链路传输所用。RTD可以各种方式确定，如下所述。
在第一种方案中，定义S-RACH时隙持续期比系统中所有用户终端最长的预期RTD还大。对于该方案，每个所发送的S-RACH PDU会从传输所指向的同一S-RACH时隙开始被接收。于是，对于使用哪个S-RACH时隙来发送S-RACH PDU将没有多义性。
在第二种方案中，通过接入和注册过程分段地确定RTD。对于该方案，可以定义S-RACH时隙持续期比最长的预期RTD要小。然后所发送的S-RACH PDU会在所指向的S-RACH时隙后的零个、一个或多个S-RACH时隙被接收。RTD可以被分成两部份：(1)整数个S-RACH时隙的第一部份(第一部份可以等于0、1、2或某些其它值)，以及(2)一S-RACH时隙一部分的第二部份。接入点可以基于接收到的S-RACH PDU来确定所述一部分。在注册期间，可以调节用户终端的发送定时来补偿所述一部分，使得来自用户终端的传输到达时与S-RACH时隙边界对齐。然后在注册过程期间确定第一部份并将其报告给用户终端。
在第三种方案中，定义S-RACH消息包括一时隙ID字段。该字段带有其中发送S-RACH PDU的特定S-RACH时隙的索引。然后，接入点能基于时隙ID字段中包括的时隙索引来确定用户终端的RTD。
时隙ID字段可以各种方式实现。在第一种实现中，在保持相同编码速率的同时增加S-RACH消息持续期(例如从2到3个OFDM码元)。在第二种实现中，保持S-RACH消息持续期但增加编码速率(例如从速率1/4到速率1/2)，这允许更多的信息比特。在第三种实现中，保持S-RACH PDU持续期(例如保持在4个OFDM码元)但延长S-RACH消息部份(例如从2到3个OFDM码元)，并且缩短参考部份(例如从2缩短到1个OFDM码元)。
缩短S-RACH PDU的参考部份会降低参考的接收信号质量，这于是会提高未检测到S-RACH传输的可能性(即高于丢失的检测概率)。该情况下，可以降低检测阈值(用来表明是否存在S-RACH传输)以实现期望的丢失检测概率。较低的检测阈值提高了在不存在S-RACH传输时宣布接收到S-RACH传输的可能性(即较高的误警概率)。然而，每个S-RACH消息中包括的CRC值可以用来实现可接受的误检测概率。
在第四种方案中，时隙索引嵌入在S-RACH消息的CRC值中。S-RACH消息的数据(例如对于表3所示的实施例是MAC ID)和时隙索引可以被提供给CRC生成器并且用来生成一CRC值。然后为S-RACH消息发送MAC ID和CRC值(但不是时隙索引)。在接入点处，接收到的S-RACH消息(例如接收到的MAC ID)和预期的时隙索引用来为接收到的消息生成一CRC值。所生成的CRC值接着与接收到的S-RACH消息中的CRC值相比较。如果CRC通过，则接入点宣布成功并且继续处理该消息。如果CRC失败，则接入点宣布失败并忽视该消息。
E.F-RACH和S-RACH传输
图7A示出S-RACH上的示例性传输。用户终端选择一特定的S-RACH时隙(例如时隙3)用于S-RACH PDU的传输。然而，如果S-RACH传输未经RTD补偿，则基于接入点定时，所发送的S-RACH PDU在到达时不会与所选S-RACH时隙的起始点时间对齐。接入点能够如上所述确定RTD。
图7B示出F-RACH上的示例性传输。用户终端选择一特定的F-RACH时隙(例如时隙5)用于F-RACH PDU的传输。F-RACH传输经RTD补偿，所发送的F-RACHPDU在到达接入点时与所选F-RACH时隙的起始点近似时间对齐。
3.系统
为了简洁，在以下描述中，根据术语所使用的环境，术语“RACH”可以指F-RACH或S-RACH或RACH。
图8示出系统100中一接入点110x以及两个用户终端120x和120y的实施例框图。用户终端120x装备有单根天线，用户终端120y装备有Nut根天线。通常，接入点和用户终端各装备有任何数量的发送/接收天线。
在上行链路上，在每个用户终端处，发送(TX)数据处理器810接收来自数据源808的话务数据以及来自控制器830的信令和其它数据(例如RACH消息的数据)。发送数据处理器810对数据进行格式化、编码、交织和调制以提供调制码元。如果用户终端装备有单根天线，则这些调制码元对应于一发送码元流。如果用户终端装备有多根天线，则发送空间处理器820接收调制码元并对其进行处理以便为每根天线提供一发送码元流。各个调制器(MOD)822接收并处理一相应的发送码元流以提供一相应的上行链路已调信号，后者接着从相关的天线824发出。
在接入点110x处，Nap根天线852a到852ap从用户终端接收所发送的上行链路已调信号，各个天线把接收到的信号提供给相应的解调器(DEMOD)854。各个解调器854执行与调制器822处的处理相反的处理，并且提供接收码元。接收(RX)空间处理器856接着对来自所有解调器854a到854ap的接收码元进行空间处理以提供经恢复的码元，经恢复的码元是用户终端所发送的调制码元的估计。接收数据处理器858进一步处理(例如码元解映射、解交织和解码)经恢复的码元以提供经解码的数据(例如经恢复的RACH消息的数据)，后者被提供给数据宿860用于存储以及/或者被提供个控制器870用于进一步处理。接收空间处理器856也可以为每个用户终端估计并提供接收SNR，它可用来确定应该为系统接入使用F-RACH还是S-RACH。
下行链路的处理可以与上行链路的处理相同或不同。来自数据源88的数据以及来自控制器870和/或调度器880的信令(例如RACH确认)由发送数据处理器890处理(例如编码、交织和调制)，并且由发送空间处理器892进一步空间处理。来自发送空间处理器892的发送码元由调制器854a到854ap进一步处理以便生成Nap个下行链路已调信号，后者接着经由天线852a到852ap发出。
在每个用户终端120处，下行链路已调信号被天线824接收、经解调器822解调、并且由接收空间处理器840和接收数据处理器842以和接入点处执行的处理相反的方式进行处理。下行链路的已解码数据被提供给数据宿844用于存储以及/或者被提供给控制器830用于进一步处理。
控制器830和870分别控制用户终端和接入点处各个处理单元的操作。存储器单元832和872分别保存控制器830和870所使用的数据和程序代码。
图9示出发送数据处理器810a一实施例的框图，该处理器能为F-RACH和S-RACH执行数据处理并且可用于图8中的发送数据处理器810x和810y。
在发送数据处理器810a内，CRC生成器912接收RACH PDU的数据。RACH数据仅包括表2和3所示实施例的MAC ID。如果使用S-RACH进行系统接入，则CRC生成器912为MAC ID生成一CRC值。组帧单元914对MAC ID和CRC值(对于S-RACH PDU)进行多路复用以形成RACH消息的主要部份，如表2和3所示。然后，扰乱器916扰乱经组帧的数据以便使数据随机化。
编码器918接收经扰乱的数据经将其与尾比特多路复用，并进一步按照所选的编码方案对经多路复用的数据和尾比特进行编码以提供编码比特。然后，重复/截短单元920重复或截短(即删除)一些编码比特以获得期望的编码速率。交织器922接着基于特定的交织方案来交织(即重排)编码比特。码元映射单元942按照特定的调制方案映射经交织的数据以提供调制码元。然后，多路复用器(MUX)926接收调制码元并将其与导频码元多路复用以提供经多路复用的码元流。下面进一步详述发送数据处理器810a中的各个单元。
4.F-RACH和S-RACH设计
如上所述，为F-RACH和S-RACH使用不同的设计以便于注册用户终端的快速系统接入，并且使实现RACH所需的系统资源量最小。表4示出F-RACH和S-RACH的示例性设计的各种参数。
表4
  参数   F-RACH   S-RACH   单位
  PDU长度   1   4   OFDM码元
  CRC   否   是
  编码速率   2/3   1/4
  调制方案   BPSK   BPSK
  频谱效率   0.67   0.25   bps/Hz
图10A示出CRC生成器912的实施例框图，其实现了以下8比特生成器多项式：
g(x)＝x8+x7+x3+x+1    公式(1)
也可以为CRC使用其它生成器多项式，这在本发明的范围内。
CRC生成器912包括串联耦合的八个延迟元件(D)1012a到1012h以及五个加法器1014a到1014e，它们实现了公式(1)所示的生成器多项式。开关(1016a)把RACH数据(例如MAC ID)提供给生成器用于计算CRC值，而在读出CRC值时把N个零值提供给生成器，其中N是CRC的比特数，对于公式(1)所示的生成器多项式等于8。对于上述实施例，其中CRC中嵌有一m比特时隙索引，开关1016a可用来在读出CRC值时提供m比特时隙索引后面跟着N-m个零(而不是N个零)。开关1016b在CRC值计算期间为生成器提供反馈，而在读出CRC值时向生成器提供零值。加法器1014e在所有RACH数据比特都已被提供给生成器后提供CRC值。对于上述实施例，开关1016a和1016b首先在10比特内在“上”(UP)位置(对于MAC ID)，接着在8比特内在“下”(DOWN)位置(对于CRC值)。
图10A也示出组帧单元914的一实施例，它包括一开关1020，开关1020首先选择RACH数据(或MAC ID)，然后选择任选的CRC值(如果要发送S-RACHPDU)。
图10进一步示出扰乱器916的一实施例，其实现了以下生成器多项式：
G(x)＝x7+x4+x    公式(2)
扰乱器916包括串联的七个延迟元件1032a到1032g。对于每个时钟周期，加法器1034对延迟元件1032d和1032g中保存的两个比特进行模2加，并且向延迟元件1032a提供一扰乱比特。经组帧的比特(d1 d2 d3...)被提供给加法器1036，加法器1036也从加法器1034接收扰乱比特。加法器1036对每个组帧的比特dn和相应的扰乱比特进行模2加，以提供经扰乱的比特qn。
图10B示出编码器918一实施例的框图，该编码器用生成器133和171(八进制)实现了速率为1/2、约束长度为7(K＝7)的二进制卷积编码。在编码器918内，多路复用器1040接收经扰乱的数据并将其与尾比特多路复用。编码器918进一步包括串联耦合的六个延迟元件1042a到1042f。四个加法器1044a到1044d也串联耦合，并且用来实现第一生成器(133)。类似地，四个加法器1046a到1046d也串联耦合，并且用来实现第二生成器(171)。如图10B所示，加法器以实现两个生成器131和171的方式进一步耦合到延迟元件。多路复用器1048从两个生成器接收两个编码比特流并将其多路复用为单个编码比特流。对于每个输入比特qn，生成两个编码比特an和bn，导致编码速率1/2。
图10B还示出重复/截短单元920的一个实施例，该单元可用来基于基编码速率1/2生成其它编码速率。在单元920内，编码器918中的速率1/2的编码比特被提供给重复单元1052和截短单元1054。重复单元1052把每个速率1/2的编码比特重复一次以得到有效的编码速率1/4。截短单元1054基于特定的截短模式删除一些速率1/2的编码比特以提供期望的编码速率。在一实施例中，基于截短模式“1110”为F-RACH实现速率2/3，该模式表示每到第四个速率1/2的编码比特就被删除以得到有效的编码速率2/3。
回过头参照图9，交织器922为各个RACH PDU重排编码比特以得到频率分集(对于S-RACH和F-RACH两者)以及时间分集(对于S-RACH)。对于表2所示的实施例，F-RACH PDU包括16个数据比特，它们用速率2/3的编码进行编码以生成24个编码比特，所述24个编码比特使用BPSK在一个OFDM码元中在24个数据子带上被发送。
表5示出F-RACH的子带交织。对于每个F-RACH PDU，交织器922首先把码片索引0到23分配给F-RACH PDU的24个编码比特。然后每个编码比特基于其码片索引被映射到一特定的数据子带，如表5所示。例如，码片索引为0的编码比特被映射到子带-24，码片索引为1的编码比特被映射为子带-12，码片索引为2的编码比特被映射到子带2，依此类推。
表5-F-RACH的导频码元和数据子带交织
  子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引
  -32   0   -16   8   0   0   16   15
  -31   0   -15   1+j   1   -1-j   17   1-j
  -30   0   -14   20   2   2   18   7
  -29   0   -13   1+j   3   -1-j   19   -1-j
  -28   0   -12   1   4   14   20   19
  -27   0   -11   1+j   5   1+j   21   -1-j
  -26   -1+j   -10   13   6   6   22   11
  -25   -1+j   -9   1-j   7   -1-j   23   -1-j
  -24   0   -8   5   8   18   24   23
  -23   -1-j   -7   -1+j   9   1-j   25   -1+j
  -22   12   -6   17   10   10   26   1-j
  -21   -1-j   -5   -1-j   11   1+j   27   0
  子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引
  -20   4   -4   9   12   22   28   0
  -19   -1-j   -3   -1+j   13   1-j   29   0
  -18   16   -2   21   14   3   30   0
  -17   -1+j   -1   -1+j   15   -1+j   31   0
对于表3所示的实施例，S-RACH PDU包括24个数据比特，它们经编码和重复以生成96个编码比特，所述96个编码比特使用BPSK在两个OFDM中在48个数据子带上被发送。表6示出S-RACH的子带交织。对于每个S-RACH PDU，交织器922首先形成两组48个编码比特。在每组内，48个编码比特分配到码片索引0到47。然后每个编码比特基于其码片索引被映射到特定的数据子带，如表6所示。例如，码片索引为0的编码比特被映射到子带-26，码片索引为1的编码比特被映射为子带1，码片索引为2的编码比特被映射为子带-17，依此类推。
表6-S-RACH的导频码元和数据子带交织
  子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引
  -32   0   -16   -1+j   8   0   0   16   -1+j   39
  -31   0   -15   1-j   14   1   1-j   1   17   -1+j   45
  -30   0   -14   1+j   20   2   -1-j   7   18   1-j   5
  -29   0   -13   1-j   26   3   -1-j   13   19   1+j   11
  -28   0   -12   1-j   32   4   -1-j   19   20   -1+j   17
  -27   0   -11   -1-j   38   5   -1+j   25   21   1+j
  -26   -1-j   0   -10   -1-j   44   6   1+j   31   22   -1+j   23
  -25   -1+j   6   -9   1-j   4   7   -1-j   23   1+j   29
  -24   -1+j   12   -8   -1-j   10   8   -1+j   37   24   -1+j   35
  -23   -1+j   18   -7   1+j   9   -1-j   43   25   1-j   41
  -22   1-j   24   -6   -1+j   16   10   -1-j   3   26   -1-j   47
  -21   1-j   -5   -1-j   22   11   1+j   9   27   0
  子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引   子带索引   导频码元p(k)   码片索引
  -20   1+j   30   -4   -1+j   28   12   1-j   15   28   0
  -19   -1-j   36   -3   -1+j   34   13   -1+j   21   29   0
  -18   -1+j   42   -2   1-j   40   14   -1-j   27   30   0
  -17   1+j   2   -1   -1+j   46   15   1+j   33   31   0
码元映射单元942映射经交织的比特以得出调制码元。在一实施例中，BPSK用于F-RACH和S-RACH两者。对于BPSK，每个经交织的编码比特(“0”或“1”)可以被映射为相应的调制码元，例如如下：
Figure GSA00000039424000201
和
Figure GSA00000039424000202
来自单元924的调制码元也称为数据码元。
多路复用器926对于每个RACH PDU把数据码元与导频码元多路复用。多路复用可以各种方式执行。下面描述F-RACH和S-RACH的特定设计。
在一实施例中，对于F-RACH，数据码元和导频码元经子带复用。每个F-RACHPDU包括与24个数据码元多路复用的28个导频码元，如表5所示。子带复用使每个数据码元的两侧都被导频码元包围。导频码元可以用来估计数据子带的信道响应(例如通过对每个数据子带两侧的导频子带的信道响应取平均)，所述信道响应可用于数据解调。
在一实施例中，对于S-RACH，如图3B所示，数据码元和导频码元是时分复用的。每个S-RACH PDU包括对于第一个两码元周期的每一个的一导频OFDM码元以及对于接下来两个码元周期的两个数据OFDM码元。在一实施例中，导频OFDM码元包括对于52个子带的52个QPSK调制码元(或导频码元)以及对于其余12个子带的零值信号，如表6所示。选择这52个导频码元使基于这些导频码元生成的波形中有最小的峰均变化。这一特征能够以较高的功率电平发送导频OFDM码元，而不生成过度的失真量。
多路复用也可以基于某些其它方案为S-RACH和F-RACH执行，这在本发明的范围内。在任一情况下，多路复用器926都为每个RACH PDU提供一经多路复用的数据和导频码元序列(标记为s(n))。
每个用户终端可装备有一根或多根天线。对于具有多根天线的用户终端，RACH PDU可以使用波束控制、波束成形、发送分集、空间多路复用等等从多根天线发出。对于波束控制，RACH PDU在与最佳性能(例如最高的接收SNR)相关的单个空间信道上被发送。对于发送分集，从多根天线和子带冗余地发出RACHPDU的数据以提供分集。波束控制可以如下所述地执行。
在上行链路上，由Nut根终端天线和Nap根接入点天线形成的MIMO信道可由一信道响应矩阵H(k)来表征，对于k∈K，其中K表示所关注的子带集合(例如K＝{-26...26})。每个矩阵H(k)包括NapNut个项，其中项hij(k)(对于i∈{1...Nap}，j∈{1...Nut})是对于第k个子带在第j根用户终端天线和第i根接入点天线之间的耦合(即复增益)。
每个子带的上行链路信道响应矩阵H(k)可以被“对角线化”(例如使用本征值分解或奇异值分解)以得出该子带的本征模式。矩阵H(k)的奇异值分解可以表示为：
H(k)＝U(k)∑(k)V H(k)，对于k∈K    公式(3)
其中U(k)是H(k)左边本征向量的(Nap×Nap)酉阵；
∑(k)是H(k)奇异值的(Nap×Nut)对角矩阵；以及
V(k)是H(k)右边本征向量的(Nut×Nut)酉阵。
可以为每个所关注的子带独立地为信道响应矩阵H(k)进行本征值分解，以便确定该子带的本征模式。每个对角矩阵∑(k)的奇异值可以被排序，使
Figure GSA00000039424000211
Figure GSA00000039424000212
其中σ1(k)是对于第k个子带最大的奇异值，是对于第k个子带最小的奇异值。当每个对角矩阵∑(k)的奇异值被排序时，相关矩阵V(k)的本征向量(或列)也相应地排序。“宽带”本征模式可以被定义为排序后所有子带的相同阶本征模式的集合。“主要”本征模式是在排序后与每个矩阵∑(k)中的最大奇异值相关的本征模式。
对于主要宽带本征模式，波束控制仅使用本征向量v 1(k)中的相位信息，对于k∈K，并且标准化每个本征向量，使本征向量中的所有元素都有相等的大小。第k个子带经标准化的本征向量可以表示为：
v ‾ ~ ( k ) = Ae jθ 1 ( k ) Ae j θ 2 ( k ) . . . Ae jθ N ut ( k ) T , 公式(4)
其中A是一常数(例如A＝1)；以及
θi(k)是第i根用户终端天线的第k个子带的相位，给出为：
θ i ( k ) = ∠ v 1 , i = tan - 1 { Im { v 1 , i ( k ) } Re { v 1 , i ( k ) } } 公式(5)
其中 v ‾ 1 ( k ) = v 1,1 ( k ) v 1,2 ( k ) . . . v 1 , N ut ( k ) T .
波束控制的空间处理于是可以表示为：
x ‾ ~ ( k ) = v ‾ ~ ( k ) s ( k ) , 对于k∈K    公式(6)
其中s(k)是要在第k个子带上发送的数据或导频码元；以及
Figure GSA00000039424000219
是波束控制的第k个子带的发送向量。
图11示出为波束控制执行空间处理的发送空间处理器820y的实施例框图。在处理器820y内，多路分解器1112接收经交织的数据和导频码元s(n)并将其多路分解成用于发送数据和导频码元的K个子带的K个子流(标记为s(1)到s(k))。每个子流包括对于F-RACH PDU的一个码元以及对于S-RACH PDU的四个码元。每个子流被提供给相应的发送子带波束控制处理器1120，后者对一个子带执行公式(6)所示的处理。
在每个发送子带波束控制处理器1120内，码元子流被提供给Nut个乘法器1122a到1122ut，后者也分别接收标准化本征向量
Figure GSA00000039424000221
的Nut个元素
Figure GSA00000039424000222
到各个乘法器1122将各个接收码元与其标准化本征向量值
Figure GSA00000039424000224
相乘以提供相应的发送码元。乘法器1122a到1122ut把Nut个发送码元子流分别提供给缓冲器/多路复用器1130a到1130ut。各个缓冲器/多路复用器1130从发送子带波束控制处理器1120a到1120k接收发送码元并对其多路复用，以便为一根天线提供一发送码元流xi(n)。
波束控制的处理在上述第60/421,309号美国临时专利申请和第10/228,393号美国专利申请中进一步详述，后者题为“Beam-Steering and Beam-Forming forWideband MIMO/MISO Systems”，于2002年8月27日提交，被转让给本发明的受让人并且通过引用被结合于此。RACH PDU也可由多天线用户终端使用发送分集、波束成形或空间多路复用来发送，在上述第60/421,309号美国临时专利申请中描述。
图12A示出一OFDM调制器822x的实施例框图，该调制器可用于图8中的每个调制器822。在OFDM调制器822x内，快速傅立叶逆变换(IFFT)单元1212接收一发送码元流xi(n)，并且使用64点的快速傅立叶逆变换(其中64对应于子带总数)把各个64发送码元的序列转换成其时域表示(也称为“经变换的”码元)。每个经变换的码元包括64个时域采样。对于每个经变换的码元，循环前缀生成器1214重复经变换码元的一部分以形成一相应的OFDM码元。在一实施例中，循环前缀包括16个采样，每个ORDM码元包括80个采样。
图12B说明了一OFDM码元。OFDM码元由两部份组成：持续期为16个采样的循环前缀，以及持续期为64个采样的经变换码元。循环前缀是经变换码元的后16个采样的副本(即循环持续)，并且被插在经变换码元的前部。循环前缀确保了OFDM码元在存在多径延迟扩展时保持其正交特性，从而提高了相对于有害路径效应的性能，所述有害路径效应比如由频率选择性衰落造成的多径和信道扩散。
循环前缀生成器1214把一OFDM码元流提供给发射机单元(TMTR)1216。发射机单元1216把OFDM码元流转换成一个或多个模拟信号，并且进一步放大、两倍和下变频所述模拟信号，以便生成使用于从相关天线发出的上行链路已调信号。
5.接入点处理
对于每个TDD帧，接入点处理F-RACH和S-RACH以便检测期望接入系统的用户终端所发送的F/S-RACH PDU。由于F-RACH和S-RACH与不同的设计相关并且具有不同的发送定时要求，因此接入点可以使用不同的接收机处理技术来检测F-RACH和S-RACH PDU。
对于F-RACH，F-RACH PDU的发送定时对于RTD补偿，接收到的F-RACHPDU在接入点处与F-RACH时隙边界近似对齐。工作在频域的判决引导的检测器可以用来检测F-RACH PDU。在一实施例中，检测器处理F-RACH分段中的全部F-RACH时隙，每次处理一个时隙。对于每个时隙，检测器确定该时隙中接收到的OFDM码元的期望信号能量是否足够高。如果回答为是，则进一步解码OFDM码元以恢复F-RACH消息。
对于S-RACH，S-RACH PDU的发送定时可能未对RTD补偿，接收到的S-RACH PDU的定时是未知的。工作在时域的滑动相关检测器可以用来检测S-RACH PDU。在一实施例中，检测器滑过S-RACH分段，每次一个采样周期。对于每个采样周期，其对应于一假设，检测器确定是否为假设从该采样周期开始接收到的S-RACH PDU的两个导频OFDM码元接收到足够的信号能量。如果回答为是，则进一步解码S-RACH PDU以恢复S-RACH消息。
用于检测和解调F-RACH和S-RACH传输的技术在上述第60/432,626号美国专利申请中详细描述。
为了清楚，已经为特殊的设计描述了随机接入技术。可以对这些设计作出各种修改，这在本发明的范围内。例如，可能期望有不止两种不同类型的RACH供随机接入。此外，RACH数据可以用其它编码、交织和调制方案来处理。
随机接入技术可用于各种无线多址通信系统。一种这样的系统是在上述第60/421,309号美国临时专利申请中描述的无线多址MIMO系统。通常，这些系统可能或可能不采用OFDM，或者可能代替OFDM而采用某些其它多载波调制方案，并且可能使用或可能不使用MIMO。
这里所述的随机接入技术可以提供各种优点。首先，F-RACH允许特定的用户终端(例如已向系统注册并且能补偿其RTD的用户终端)快速地接入系统。这对于分组数据应用是尤其期望的，分组数据应用一般特征是被话务突发零星截短的长无声周期。快速系统接入于是使用户终端能快速地获得这些零星数据突发的系统资源。其次，F-RACH和S-RACH的组合能在各种工作状态和条件下(例如已注册和未注册的用户终端、高和低的接收SNR等等)有效地处理用户终端。
这里所述的技术可由各种手段实现。例如，这些技术可以用硬件、软件或者它们的组合来实现。对于硬件实现而言，便于用户终端和接入点处的随机接入的元件可以在以下元器件内实现：一个或多个专用集成电路(ASIC)、数字信号处理器(DSP)、数字信号处理设备(DSPD)、可编程逻辑器件(PLD)、场可编程门阵列(FPGA)、处理器、控制器、微控制器、微处理器、被设计成执行这里所述功能的其它电子单元或者它们的组合。
对于软件实现而言，随机接入技术可以用执行这里所述功能的模块(例如过程、功能等等)来实现。软件代码可以被保存在存储器单元(例如图8中的存储器单元832和872)中并由处理器执行(例如控制器830和870)。存储器单元可以在处理器内或在处理器外实现，后一情况下它可以通过本领域公知的各种手段在通信上耦合到处理器。
这里包括的标题是为了索引，并且帮助定位特定的章节。这些标题不是为了限制其下所述概念的范围，这些概念可应用于整篇说明书中的其它章节。
所公开实施例的以上描述使本领域的技术人员能制造或使用本发明。对这些实施例的修改对于本领域技术人员是显而易见的，这里定义的基本原理可以应用于其它实施例而不背离本发明的精神或范围。因此，本发明不限于这里所示的实施例，而是应该符合与这里公开的原理和新颖性特征一致的最宽泛的范围内。

Claims (23)

1.一种接入无线多址通信系统的方法，包括：
接收一广播消息，所述广播消息包括为一帧配置至少两个随机接入信道的信息；
确定一终端的当前工作状态；
基于所述当前工作状态，从至少两个随机接入信道中选择一个随机接入信道；以及
在所述帧期间，在所选的随机接入信道上发送一消息，以接入所述系统。
2.如权利要求1所述的方法，其特征在于，所述至少两个随机接入信道包括由注册终端进行系统接入所使用的第一随机接入信道，以及由注册和未注册终端进行系统接入所使用的第二随机接入信道。
3.如权利要求2所述的方法，其特征在于，对在所述第一随机接入信道上的传输补偿传播延迟。
4.如权利要求1所述的方法，其特征在于，所述当前工作状态表示所述终端是否已向系统注册。
5.如权利要求1所述的方法，其特征在于，所述当前工作状态表示所述终端是否能补偿到达接收该消息的接入点的传播延迟。
6.如权利要求1所述的方法，其特征在于，所述当前工作状态表示是否为所述终端实现一特定的、接收到的信噪比SNR。
7.如权利要求1所述的方法，其特征在于还包括：
在为所述消息接收到确认或者超过了最大接入尝试次数以前，重发所述消息。
8.如权利要求1所述的方法，其特征在于还包括：
如果未通过所选的随机接入信道获得接入，则在从所述至少两个随机接入信道中选择的另一随机接入信道上发送另一消息。
9.如权利要求1所述的方法，其特征在于，所述发送步骤包括：
从所选的随机接入信道可用的多个时隙中选择一时隙；以及
在所选的时隙中发送所述消息。
10.如权利要求1所述的方法，其特征在于，所述消息包括所述终端的标识符。
11.如权利要求10所述的方法，其特征在于，所述标识符对于所述终端是唯一的。
12.如权利要求10所述的方法，其特征在于，所述标识符是未注册终端所使用的公共标识符。
13.如权利要求1所述的方法，其特征在于，所述多址通信系统支持带有单根天线的终端和带有多根天线的终端。
14.如权利要求1所述的方法，其特征在于，所述多址通信系统使用正交频分复用。
15.一种接入无线多址多输入多输出通信系统的方法，包括：
确定是已向系统注册一终端还是未向系统注册终端；
如果所述终端已注册，则在第一随机接入信道上发送第一消息，以接入所述系统；以及
如果所述终端未注册，则在第二随机接入信道上发送第二消息，以接入所述系统。
16.如权利要求15所述的方法，其特征在于，所述第一消息的方式弥补了到达接收第一消息的接入点的传播延迟。
17.一种便于无线多址通信系统中的随机接入的方法，包括：
处理由已注册终端用来接入所述系统的第一随机接入信道；以及
处理由已注册和未注册终端用来接入所述系统的第二随机接入信道，
其中，所述第一和第二随机接入信道是同一帧的不同部分。
18.如权利要求17所述的方法，其特征在于，对所述第一和第二随机接入信道中每个信道的所述处理都包括检测是否在所述随机接入信道上存在传输。
19.如权利要求18所述的方法，其特征在于，所述检测的步骤基于一导频，所述导频包括在所述第一和第二随机接入信道上的每个传输中。
20.如权利要求18所述的方法，其特征在于还包括：
为在所述第二随机接入信道中检测到其传输的终端，确定往返延迟。
21.如权利要求17所述的方法，其特征在于，为在所述第一随机接入信道上的传输弥补传播延迟，并且对第一随机接入信道的处理包括：
检测在第一随机接入信道可用的多个时隙的每个时隙中是否存在传输。
22.如权利要求21所述的方法，其特征在于，所述检测步骤基于一判决引导的检测器。
23.如权利要求17所述的方法，其特征在于，对第二随机接入信道的所述处理包括：
通过执行滑动相关，来检测是否在第二随机接入信道上存在传输。
CN2010101292456A 2002-10-25 2003-10-24 无线多址通信系统的随机接入 Expired - Lifetime CN101883438B (zh)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US42130902P 2002-10-25 2002-10-25
US60/421,309 2002-10-25
US43244002P 2002-12-10 2002-12-10
US60/432,440 2002-12-10
US10/693,532 US8169944B2 (en) 2002-10-25 2003-10-23 Random access for wireless multiple-access communication systems
US10/693,532 2003-10-23

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN 200380104584 Division CN1717901A (zh) 2002-10-25 2003-10-24 无线多址通信系统的随机接入

Publications (2)

Publication Number Publication Date
CN101883438A true CN101883438A (zh) 2010-11-10
CN101883438B CN101883438B (zh) 2013-06-05

Family

ID=32180512

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2010101292456A Expired - Lifetime CN101883438B (zh) 2002-10-25 2003-10-24 无线多址通信系统的随机接入

Country Status (15)

Country Link
US (2) US8169944B2 (zh)
EP (3) EP1557003B1 (zh)
JP (1) JP4509793B2 (zh)
KR (2) KR101149096B1 (zh)
CN (1) CN101883438B (zh)
AT (1) ATE556512T1 (zh)
AU (2) AU2003287294C1 (zh)
BR (1) BR0315561A (zh)
CA (2) CA2810036C (zh)
ES (2) ES2417354T3 (zh)
HK (2) HK1121899A1 (zh)
IL (2) IL167570A (zh)
MX (1) MXPA05004396A (zh)
TW (1) TWI343724B (zh)
WO (1) WO2004038951A2 (zh)

Families Citing this family (142)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7295509B2 (en) 2000-09-13 2007-11-13 Qualcomm, Incorporated Signaling method in an OFDM multiple access system
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US8194770B2 (en) 2002-08-27 2012-06-05 Qualcomm Incorporated Coded MIMO systems with selective channel inversion applied per eigenmode
US8134976B2 (en) 2002-10-25 2012-03-13 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8570988B2 (en) 2002-10-25 2013-10-29 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US20040081131A1 (en) 2002-10-25 2004-04-29 Walton Jay Rod OFDM communication system with multiple OFDM symbol sizes
US8208364B2 (en) 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
US8218609B2 (en) 2002-10-25 2012-07-10 Qualcomm Incorporated Closed-loop rate control for a multi-channel communication system
US7986742B2 (en) 2002-10-25 2011-07-26 Qualcomm Incorporated Pilots for MIMO communication system
US8169944B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US7002900B2 (en) 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US8320301B2 (en) 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US7324429B2 (en) 2002-10-25 2008-01-29 Qualcomm, Incorporated Multi-mode terminal in a wireless MIMO system
US8170513B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Data detection and demodulation for wireless communication systems
KR100539854B1 (ko) * 2003-01-09 2005-12-28 삼성전자주식회사 시공간 트렐리스 코드를 사용하는 이동 통신 시스템에서다중화 이득과 다이버시티 이득을 동시에 획득하기 위한데이터 송수신 장치 및 방법
KR100526511B1 (ko) * 2003-01-23 2005-11-08 삼성전자주식회사 시공간 트렐리스 코드를 사용하는 이동 통신 시스템에서파일럿 시퀀스 송수신 장치 및 방법
US20040223472A1 (en) * 2003-03-06 2004-11-11 Sankaran Sundar G. Data randomization in a wireless communication system
US7043250B1 (en) * 2003-04-16 2006-05-09 Verizon Corporate Services Group Inc. Systems and methods for forming and operating a communications network
KR20050015913A (ko) * 2003-08-14 2005-02-21 삼성전자주식회사 직교 주파수 분할 다중 방식 통신 시스템에서 파일럿송수신 장치 및 방법
US8249550B2 (en) * 2003-09-26 2012-08-21 Nokia Corporation Method and apparatus for achieving good usability for networked applications in multi mode mobile terminals
US9473269B2 (en) 2003-12-01 2016-10-18 Qualcomm Incorporated Method and apparatus for providing an efficient control channel structure in a wireless communication system
CN102064848B (zh) 2004-01-29 2012-07-25 桥扬科技有限公司 用于多小区宽带无线系统中的移动站和基站的方法和装置
KR100804667B1 (ko) * 2004-03-09 2008-02-20 포스데이타 주식회사 다중-반송파 통신 시스템에서의 랜덤 억세스 방법 및 장치
BRPI0512001B1 (pt) * 2004-06-10 2019-07-09 Godo Kaisha Ip Bridge 1 Aparelho de terminal de comunicação para realizar uma comunicação por rádio com base em um aparelho de estação base
US8111663B2 (en) 2004-07-20 2012-02-07 Qualcomm Incorporated Methods and systems for variable rate broadcast with soft handoff
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US7475323B2 (en) 2004-08-20 2009-01-06 Qualcomm Incorporated Method and apparatus for receiving a control channel in a wireless communication system
US20060045169A1 (en) * 2004-08-27 2006-03-02 Qualcomm Incorporated Coded-bit scrambling for multi-stream communication in a mimo channel
US8135088B2 (en) * 2005-03-07 2012-03-13 Q1UALCOMM Incorporated Pilot transmission and channel estimation for a communication system utilizing frequency division multiplexing
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US7423988B2 (en) * 2005-03-31 2008-09-09 Adc Telecommunications, Inc. Dynamic reconfiguration of resources through page headers
US7640019B2 (en) 2005-03-31 2009-12-29 Adc Telecommunications, Inc. Dynamic reallocation of bandwidth and modulation protocols
US20060221913A1 (en) * 2005-03-31 2006-10-05 Adc Telecommunications, Inc. Integrated network management of a software defined radio system
US20060223514A1 (en) * 2005-03-31 2006-10-05 Adc Telecommunications, Inc. Signal enhancement through diversity
US7424307B2 (en) * 2005-03-31 2008-09-09 Adc Telecommunications, Inc. Loss of page synchronization
US7474891B2 (en) * 2005-03-31 2009-01-06 Adc Telecommunications, Inc. Dynamic digital up and down converters
US20060223515A1 (en) * 2005-03-31 2006-10-05 Adc Telecommunications, Inc. SNMP management in a software defined radio
US7583735B2 (en) * 2005-03-31 2009-09-01 Adc Telecommunications, Inc. Methods and systems for handling underflow and overflow in a software defined radio
US20060222020A1 (en) * 2005-03-31 2006-10-05 Adc Telecommunications, Inc. Time start in the forward path
US20060222019A1 (en) * 2005-03-31 2006-10-05 Adc Telecommunications, Inc. Time stamp in the reverse path
US20060227805A1 (en) * 2005-03-31 2006-10-12 Adc Telecommunications, Inc. Buffers handling multiple protocols
US7398106B2 (en) * 2005-03-31 2008-07-08 Adc Telecommunications, Inc. Dynamic readjustment of power
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US7953039B2 (en) 2005-04-21 2011-05-31 Samsung Elecronics Co., Ltd. System and method for channel estimation in a delay diversity wireless communication system
US7480517B2 (en) * 2005-04-27 2009-01-20 Motorola, Inc. Method of power control in a wireless communication system
US7466749B2 (en) 2005-05-12 2008-12-16 Qualcomm Incorporated Rate selection with margin sharing
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8611284B2 (en) 2005-05-31 2013-12-17 Qualcomm Incorporated Use of supplemental assignments to decrement resources
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US7574224B2 (en) 2005-06-13 2009-08-11 Qualcomm Incorporated Methods and apparatus for performing timing synchronization with base stations
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US8358714B2 (en) 2005-06-16 2013-01-22 Qualcomm Incorporated Coding and modulation for multiple data streams in a communication system
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US20070041457A1 (en) 2005-08-22 2007-02-22 Tamer Kadous Method and apparatus for providing antenna diversity in a wireless communication system
US7889709B2 (en) * 2005-08-23 2011-02-15 Sony Corporation Distinguishing between data packets sent over the same set of channels
US20070064665A1 (en) 2005-08-23 2007-03-22 Interdigital Technology Corporation Method and apparatus for accessing an uplink random access channel in a single carrier frequency division multiple access system
US8644292B2 (en) 2005-08-24 2014-02-04 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
US8731562B2 (en) * 2005-08-30 2014-05-20 Telefonaktiebolaget L M Ericsson (Publ) Detection of control messages for HSDPA
EP1916856A1 (en) * 2005-09-30 2008-04-30 Matsushita Electric Industrial Co., Ltd. Wireless communication mobile station apparatus and rach data transmitting method
US9144060B2 (en) * 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US9210651B2 (en) * 2005-10-27 2015-12-08 Qualcomm Incorporated Method and apparatus for bootstraping information in a communication system
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US8582509B2 (en) 2005-10-27 2013-11-12 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8045512B2 (en) * 2005-10-27 2011-10-25 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
CA2625114C (en) * 2005-11-01 2016-01-12 Telefonaktiebolaget Lm Ericsson (Publ) Methods and arrangements in a radio communication system
GB2445336B (en) * 2005-11-04 2010-12-08 Nec Corp Wireless communication system and method of controlling a transmission power
EP3461213A1 (en) * 2005-11-04 2019-03-27 LG Electronics Inc. Random access dimensioning methods and procedures for frequency division multiplexing access systems
US8582548B2 (en) 2005-11-18 2013-11-12 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US20070140190A1 (en) * 2005-12-21 2007-06-21 Samsung Electronics Co., Ltd. Method and system for uplink scheduling in an orthogonal frequency division multiple access network
JP4711835B2 (ja) 2006-01-17 2011-06-29 株式会社エヌ・ティ・ティ・ドコモ 送信装置および受信装置並びにランダムアクセス制御方法
US9232537B2 (en) 2006-02-07 2016-01-05 Qualcomm Incorporated Apparatus and method for fast access in a wireless communication system
US9130791B2 (en) 2006-03-20 2015-09-08 Qualcomm Incorporated Uplink channel estimation using a signaling channel
JP2007295549A (ja) * 2006-03-31 2007-11-08 Matsushita Electric Ind Co Ltd Ｍｉｍｏ受信装置およびｍｉｍｏ通信システム
KR101396558B1 (ko) * 2006-04-19 2014-05-21 삼성전자주식회사 랜덤액세스 다이버시티를 얻기 위한 이동국의 송신 방법
US8165097B2 (en) 2006-04-19 2012-04-24 Electronics and Telecommincations Research Institute Transmission method of mobile station for random access channel diversity
WO2007125910A1 (ja) * 2006-04-25 2007-11-08 Panasonic Corporation 無線通信端末装置、無線通信基地局装置及び無線通信方法
KR101151817B1 (ko) 2006-05-03 2012-06-01 한국전자통신연구원 이동 통신 시스템에서의 상향 링크 제어 정보 전송 방법
TWI551080B (zh) * 2006-05-09 2016-09-21 內數位科技公司 Ｏｆｄｍ-ｍｉｍｏ系統隨機存取頻道
JP4745391B2 (ja) 2006-06-01 2011-08-10 シャープ株式会社 移動局と基地局との間の接続処理方法、移動局、基地局、マルチキャリア移動体通信システムおよびランダムアクセスチャネルのマッピング方法
US8295243B2 (en) 2006-08-21 2012-10-23 Qualcomm Incorporated Method and apparatus for random access in an orthogonal multiple-access communication system
WO2008033463A1 (en) * 2006-09-15 2008-03-20 Interdigital Technology Corporation Method and apparatus for dynamic updates of random access parameters
EP1903689B1 (en) * 2006-09-22 2016-11-09 Mitsubishi Electric R&D Centre Europe B.V. Method and device for transferring signals representative of a pilot symbol pattern
KR100922983B1 (ko) * 2006-09-26 2009-10-22 삼성전자주식회사 무선통신시스템에서 스케줄링 채널 신호의 송수신 방법 및 장치
KR100788901B1 (ko) 2006-09-29 2007-12-27 한국전자통신연구원 이동통신 시스템에서 임의 접속 채널 운용 방법
US8976727B2 (en) * 2006-10-22 2015-03-10 Viasat, Inc. Cyclical obstruction communication system
JP4818081B2 (ja) * 2006-11-30 2011-11-16 京セラ株式会社 割当方法およびそれを利用した基地局装置
WO2008085092A1 (en) * 2007-01-09 2008-07-17 Telefonaktiebolaget Lm Ericsson (Publ) Synchronisation in ofdm using polynomial cancellation coding
KR101346368B1 (ko) 2007-01-12 2013-12-31 삼성전자 주식회사 고속의 이동국을 위한 랜덤액세스 프리앰블과 저속의이동국을 위한 랜덤액세스 프리앰블을 주파수축 상에서다중화하는 방법
JP4850737B2 (ja) * 2007-02-02 2012-01-11 三菱電機株式会社 無線通信装置
US8169957B2 (en) 2007-02-05 2012-05-01 Qualcomm Incorporated Flexible DTX and DRX in a wireless communication system
KR101260079B1 (ko) * 2007-02-06 2013-05-02 엘지전자 주식회사 무선 통신 시스템의 랜덤 액세스 방법
EP3096569A1 (en) * 2007-02-12 2016-11-23 I.P.Access Limited Network element and method for setting a power level in a wireless communication system
US7990920B2 (en) 2007-04-26 2011-08-02 Samsung Electronics Co., Ltd. Transmit diversity for acknowledgement and category 0 bits in a wireless communication system
WO2008150206A1 (en) * 2007-06-07 2008-12-11 Telefonaktiebolaget Lm Ericsson (Publ) Dual random access channels in extended range
KR100884384B1 (ko) * 2007-07-03 2009-02-17 한국전자통신연구원 전송 방식 변경 방법, 패킷 재전송 요구 방법 및 패킷재전송 방법
US8848913B2 (en) * 2007-10-04 2014-09-30 Qualcomm Incorporated Scrambling sequence generation in a communication system
CN101843007B (zh) * 2007-10-31 2014-09-24 艾利森电话股份有限公司 随机接入过程期间传输模式的选择
US8787181B2 (en) * 2008-01-14 2014-07-22 Qualcomm Incorporated Resource allocation randomization
JP5109707B2 (ja) * 2008-02-19 2012-12-26 コニカミノルタビジネステクノロジーズ株式会社 定着装置及び画像形成装置
US8923249B2 (en) * 2008-03-26 2014-12-30 Qualcomm Incorporated Method and apparatus for scrambling sequence generation in a communication system
WO2010000312A1 (en) * 2008-07-01 2010-01-07 Nokia Siemens Networks Oy Apparatus for ranging, in particular for use in a multiple user multiple input multiple output wireless telecommunications network
KR20100004146A (ko) * 2008-07-03 2010-01-13 삼성전자주식회사 이동통신 시스템에서 음영 지역의 단말의 통신을 위한 장치및 방법
US8243690B2 (en) 2008-07-09 2012-08-14 Intel Corporation Bandwidth allocation base station and method for allocating uplink bandwidth using SDMA
WO2010045884A1 (en) * 2008-10-24 2010-04-29 Mediatek Inc. Contention-based access channel design in mimo ofdm/ofdma systems
EP2214447B1 (en) * 2009-01-29 2016-03-30 Stichting IMEC Nederland Access method and data frame structure for use in body area networks
KR101636258B1 (ko) * 2009-03-20 2016-07-05 삼성전자 주식회사 이동통신시스템에서 네트워크의 ｒａｃｈ 관련 시스템 자원자동적 최적화 방법
US8559325B2 (en) * 2009-09-15 2013-10-15 Qualcomm Incorporated Systems and methods for over the air load indicator for wireless scheduling
US8868091B2 (en) 2010-01-18 2014-10-21 Qualcomm Incorporated Methods and apparatus for facilitating inter-cell interference coordination via over the air load indicator and relative narrowband transmit power
KR20110113897A (ko) * 2010-04-12 2011-10-19 주식회사 팬택 다수의 요소 반송파를 운영하는 무선 통신 시스템에서 업링크 타이밍 그룹에 대한 정보를 송수신하는 방법 및 장치
US9668283B2 (en) 2010-05-05 2017-05-30 Qualcomm Incorporated Collision detection and backoff window adaptation for multiuser MIMO transmission
US20120195268A1 (en) * 2011-01-31 2012-08-02 Industrial Technology Research Institute Network access method and wireless communication device and base station using the same
US8396072B2 (en) * 2011-02-21 2013-03-12 Renesas Mobile Corporation Method and apparatus for channel traffic congestion avoidance in a mobile communication system
CN103298136B (zh) * 2012-02-29 2016-11-23 华为技术有限公司 一种随机接入方法、终端、基站及系统
US9332570B2 (en) * 2012-03-02 2016-05-03 Telefonaktiebolaget Lm Ericsson (Publ) Access response signaling in a cellular communication system
US9590687B2 (en) * 2012-06-18 2017-03-07 Telefonaktiebolaget Lm Ericsson (Publ) Prefiltering in MIMO receiver
US9805442B2 (en) * 2012-10-03 2017-10-31 Avago Technologies General Ip (Singapore) Pte. Ltd. Fine-grained bit-rate control
KR20150093161A (ko) * 2012-12-04 2015-08-17 엘지전자 주식회사 무선 통신 시스템에서 단말의 이동 속도에 따른 참조 신호의 패턴 변경 방법 및 이를 위한 장치
CN104919885A (zh) * 2013-01-17 2015-09-16 瑞典爱立信有限公司 动态随机接入资源大小配置和选择
CN105874745B (zh) * 2013-10-30 2019-08-13 交互数字专利控股公司 无线系统中的载波聚合配置
US11637763B2 (en) 2013-10-30 2023-04-25 Interdigital Patent Holdings, Inc. Connectivity robustness in wireless systems
EP3793304B1 (en) * 2014-03-21 2023-09-06 Sun Patent Trust Scheduling request procedure for d2d communication
US10499421B2 (en) 2014-03-21 2019-12-03 Qualcomm Incorporated Techniques for configuring preamble and overhead signals for transmissions in an unlicensed radio frequency spectrum band
CN104199315B (zh) * 2014-09-22 2017-01-11 哈电发电设备国家工程研究中心有限公司 基于rtds的微电网储能系统试验平台
US20180069677A1 (en) * 2016-09-02 2018-03-08 Qualcomm Incorporated Pre-association multi-user acknowledgement
CN111988862B (zh) * 2019-05-21 2022-07-19 大唐移动通信设备有限公司 随机接入信道的选择、配置方法、接入设备及网络设备
US11696145B2 (en) * 2020-03-05 2023-07-04 Nokia Solutions And Networks Oy Registered and unregistered operation for shared band wireless nodes within wireless networks

Family Cites Families (472)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4736371A (en) 1985-12-30 1988-04-05 Nec Corporation Satellite communications system with random multiple access and time slot reservation
US4750198A (en) 1986-12-12 1988-06-07 Astronet Corporation/Plessey U.K. Cellular radiotelephone system providing diverse separately-accessible groups of channels
US4797879A (en) * 1987-06-05 1989-01-10 American Telephone And Telegraph Company At&T Bell Laboratories Packet switched interconnection protocols for a star configured optical lan
IL100213A (en) 1990-12-07 1995-03-30 Qualcomm Inc Mikrata Kedma phone system and its antenna distribution system
US5239677A (en) 1991-07-01 1993-08-24 Motorola, Inc. Method and apparatus for initiating communication on an assigned frequency
IT1250515B (it) 1991-10-07 1995-04-08 Sixtel Spa Rete per area locale senza fili.
US5241544A (en) 1991-11-01 1993-08-31 Motorola, Inc. Multi-channel tdm communication system slot phase correction
US5592490A (en) 1991-12-12 1997-01-07 Arraycomm, Inc. Spectrally efficient high capacity wireless communication systems
US6850252B1 (en) 1999-10-05 2005-02-01 Steven M. Hoffberg Intelligent electronic appliance system and method
US5295159A (en) 1992-04-17 1994-03-15 Bell Communications Research, Inc. Coordinated coding for digital transmission
RU2015281C1 (ru) 1992-09-22 1994-06-30 Борис Михайлович Кондрашов Запорное устройство
GB2300337B (en) 1992-10-05 1997-03-26 Ericsson Ge Mobile Communicat Digital control channel
US5404355A (en) 1992-10-05 1995-04-04 Ericsson Ge Mobile Communications, Inc. Method for transmitting broadcast information in a digital control channel
US5471647A (en) 1993-04-14 1995-11-28 The Leland Stanford Junior University Method for minimizing cross-talk in adaptive transmission antennas
US5479447A (en) 1993-05-03 1995-12-26 The Board Of Trustees Of The Leland Stanford, Junior University Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines
US5483667A (en) 1993-07-08 1996-01-09 Northern Telecom Limited Frequency plan for a cellular network
DE69423546T2 (de) 1993-07-09 2000-09-21 Koninkl Philips Electronics Nv Telekommunikationsnetzwerk, Hauptstation und Nebenstation zum Gebrauch in solchem Netzwerk
US5506861A (en) 1993-11-22 1996-04-09 Ericsson Ge Mobile Comminications Inc. System and method for joint demodulation of CDMA signals
US5490087A (en) 1993-12-06 1996-02-06 Motorola, Inc. Radio channel access control
US5422733A (en) 1994-02-04 1995-06-06 Motorola, Inc. Method and apparatus for facsimile communication of first and second type information with selective call communication systems
US5491837A (en) * 1994-03-07 1996-02-13 Ericsson Inc. Method and system for channel allocation using power control and mobile-assisted handover measurements
US5493712A (en) 1994-03-23 1996-02-20 At&T Corp. Fast AGC for TDMA radio systems
WO1995030316A1 (en) 1994-05-02 1995-11-09 Motorola Inc. Multiple subchannel flexible protocol method and apparatus
US5677909A (en) * 1994-05-11 1997-10-14 Spectrix Corporation Apparatus for exchanging data between a central station and a plurality of wireless remote stations on a time divided commnication channel
US6157343A (en) 1996-09-09 2000-12-05 Telefonaktiebolaget Lm Ericsson Antenna array calibration
DE4425713C1 (de) 1994-07-20 1995-04-20 Inst Rundfunktechnik Gmbh Verfahren zur Vielträger Modulation und Demodulation von digital codierten Daten
FR2724084B1 (fr) 1994-08-31 1997-01-03 Alcatel Mobile Comm France Systeme de transmission d'informations par un canal de transmission variant dans le temps, et equipements d'emission et de reception correspondants
US5710768A (en) 1994-09-30 1998-01-20 Qualcomm Incorporated Method of searching for a bursty signal
MY120873A (en) 1994-09-30 2005-12-30 Qualcomm Inc Multipath search processor for a spread spectrum multiple access communication system
JP3231575B2 (ja) * 1995-04-18 2001-11-26 三菱電機株式会社 無線データ伝送装置
KR0155818B1 (ko) 1995-04-29 1998-11-16 김광호 다중 반송파 전송시스템에서 적응형 전력 분배 방법 및 장치
US5606729A (en) 1995-06-21 1997-02-25 Motorola, Inc. Method and apparatus for implementing a received signal quality measurement in a radio communication system
US5729542A (en) 1995-06-28 1998-03-17 Motorola, Inc. Method and apparatus for communication system access
US7929498B2 (en) 1995-06-30 2011-04-19 Interdigital Technology Corporation Adaptive forward power control and adaptive reverse power control for spread-spectrum communications
US5638369A (en) 1995-07-05 1997-06-10 Motorola, Inc. Method and apparatus for inbound channel selection in a communication system
DE69535033T2 (de) 1995-07-11 2007-03-08 Alcatel Zuweisung von Kapazität bei OFDM
GB9514659D0 (en) 1995-07-18 1995-09-13 Northern Telecom Ltd An antenna downlink beamsteering arrangement
US5867539A (en) 1995-07-21 1999-02-02 Hitachi America, Ltd. Methods and apparatus for reducing the effect of impulse noise on receivers
JP2802255B2 (ja) 1995-09-06 1998-09-24 株式会社次世代デジタルテレビジョン放送システム研究所 直交周波数分割多重伝送方式及びそれを用いる送信装置と受信装置
GB9521739D0 (en) 1995-10-24 1996-01-03 Nat Transcommunications Ltd Decoding carriers encoded using orthogonal frequency division multiplexing
US6005876A (en) 1996-03-08 1999-12-21 At&T Corp Method and apparatus for mobile data communication
US5699365A (en) 1996-03-27 1997-12-16 Motorola, Inc. Apparatus and method for adaptive forward error correction in data communications
JPH09266466A (ja) 1996-03-28 1997-10-07 Sumitomo Electric Ind Ltd デジタル伝送システム
US5924015A (en) 1996-04-30 1999-07-13 Trw Inc Power control method and apparatus for satellite based telecommunications system
JPH09307526A (ja) 1996-05-17 1997-11-28 Mitsubishi Electric Corp デジタル放送受信機
DE69705356T2 (de) 1996-05-17 2002-05-02 Motorola Ltd Verfahren und Vorrichtung zur Gewichtung eines Uebertragungsweges
US5822374A (en) 1996-06-07 1998-10-13 Motorola, Inc. Method for fine gains adjustment in an ADSL communications system
FI101920B (fi) 1996-06-07 1998-09-15 Nokia Telecommunications Oy Kanavanvarausmenetelmä pakettiverkkoa varten
US6072779A (en) 1997-06-12 2000-06-06 Aware, Inc. Adaptive allocation for variable bandwidth multicarrier communication
US6798735B1 (en) 1996-06-12 2004-09-28 Aware, Inc. Adaptive allocation for variable bandwidth multicarrier communication
US6097771A (en) 1996-07-01 2000-08-01 Lucent Technologies Inc. Wireless communications system having a layered space-time architecture employing multi-element antennas
JPH1051402A (ja) 1996-08-01 1998-02-20 Nec Corp 受信電界検出回路
WO1998009385A2 (en) 1996-08-29 1998-03-05 Cisco Technology, Inc. Spatio-temporal processing for communication
JP2001359152A (ja) 2000-06-14 2001-12-26 Sony Corp 無線通信システム、無線基地局装置、無線移動局装置、無線ゾーン割当て方法及び無線通信方法
JP2846860B2 (ja) 1996-10-01 1999-01-13 ユニデン株式会社 スペクトル拡散通信方式を用いた送信機、受信機、通信システム及び通信方法
US6275543B1 (en) 1996-10-11 2001-08-14 Arraycomm, Inc. Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing
US5886988A (en) 1996-10-23 1999-03-23 Arraycomm, Inc. Channel assignment and call admission control for spatial division multiple access communication systems
US6049548A (en) * 1996-11-22 2000-04-11 Stanford Telecommunications, Inc. Multi-access CS-P/CD-E system and protocols on satellite channels applicable to a group of mobile users in close proximity
EP0948847A1 (en) 1996-11-26 1999-10-13 TRW Inc. Cochannel signal processing system
US6232918B1 (en) 1997-01-08 2001-05-15 Us Wireless Corporation Antenna array calibration in wireless communication systems
JPH10209956A (ja) * 1997-01-28 1998-08-07 Nippon Telegr & Teleph Corp <Ntt> 無線パケット通信方法
US6128276A (en) 1997-02-24 2000-10-03 Radix Wireless, Inc. Stacked-carrier discrete multiple tone communication technology and combinations with code nulling, interference cancellation, retrodirective communication and adaptive antenna arrays
JPH10303794A (ja) 1997-02-27 1998-11-13 Mitsubishi Electric Corp 既知系列検出器
US6084915A (en) 1997-03-03 2000-07-04 3Com Corporation Signaling method having mixed-base shell map indices
US6175550B1 (en) 1997-04-01 2001-01-16 Lucent Technologies, Inc. Orthogonal frequency division multiplexing system with dynamically scalable operating parameters and method thereof
KR100267856B1 (ko) 1997-04-16 2000-10-16 윤종용 이동통신시스템에서오버헤드채널관리방법및장치
US6308080B1 (en) 1997-05-16 2001-10-23 Texas Instruments Incorporated Power control in point-to-multipoint systems
US6008760A (en) 1997-05-23 1999-12-28 Genghis Comm Cancellation system for frequency reuse in microwave communications
FR2764143A1 (fr) 1997-05-27 1998-12-04 Philips Electronics Nv Procede de determination d'un format d'emission de symboles dans un systeme de transmission et systeme
US5867478A (en) 1997-06-20 1999-02-02 Motorola, Inc. Synchronous coherent orthogonal frequency division multiplexing system, method, software and device
US6067458A (en) 1997-07-01 2000-05-23 Qualcomm Incorporated Method and apparatus for pre-transmission power control using lower rate for high rate communication
US6333953B1 (en) 1997-07-21 2001-12-25 Ericsson Inc. System and methods for selecting an appropriate detection technique in a radiocommunication system
EP0895387A1 (de) 1997-07-28 1999-02-03 Deutsche Thomson-Brandt Gmbh Erkennung des Übertragungsmodus eines DVB-Signales
US6141542A (en) 1997-07-31 2000-10-31 Motorola, Inc. Method and apparatus for controlling transmit diversity in a communication system
CN1086061C (zh) 1997-08-12 2002-06-05 鸿海精密工业股份有限公司 电连接器的固持装置
EP0899896A1 (de) 1997-08-27 1999-03-03 Siemens Aktiengesellschaft Verfahren und Einrichtung zur Schätzung räumlicher Parameter von Überstragungskanälen
US6131016A (en) 1997-08-27 2000-10-10 At&T Corp Method and apparatus for enhancing communication reception at a wireless communication terminal
JP2991167B2 (ja) 1997-08-27 1999-12-20 三菱電機株式会社 Ｔｄｍａ可変スロット割当方法
US6167031A (en) 1997-08-29 2000-12-26 Telefonaktiebolaget Lm Ericsson (Publ) Method for selecting a combination of modulation and channel coding schemes in a digital communication system
BR9812816A (pt) 1997-09-15 2000-08-08 Adaptive Telecom Inc Processos para comunicação sem fio, e para eficientemente determinar na estação base um canal espacial da unidade móvel em um sistema de comunicação sem fio, e, estação base de cdma
US6590928B1 (en) 1997-09-17 2003-07-08 Telefonaktiebolaget Lm Ericsson (Publ) Frequency hopping piconets in an uncoordinated wireless multi-user system
AUPO932297A0 (en) 1997-09-19 1997-10-09 Commonwealth Scientific And Industrial Research Organisation Medium access control protocol for data communications
KR100234329B1 (ko) 1997-09-30 1999-12-15 윤종용 Ofdm 시스템 수신기의 fft 윈도우 위치 복원장치 및 그 방법_
US6178196B1 (en) 1997-10-06 2001-01-23 At&T Corp. Combined interference cancellation and maximum likelihood decoding of space-time block codes
US6574211B2 (en) 1997-11-03 2003-06-03 Qualcomm Incorporated Method and apparatus for high rate packet data transmission
US6377812B1 (en) 1997-11-20 2002-04-23 University Of Maryland Combined power control and space-time diversity in mobile cellular communications
US6122247A (en) 1997-11-24 2000-09-19 Motorola Inc. Method for reallocating data in a discrete multi-tone communication system
JPH11163823A (ja) 1997-11-26 1999-06-18 Victor Co Of Japan Ltd 直交周波数分割多重信号伝送方法、送信装置及び受信装置
US5936569A (en) 1997-12-02 1999-08-10 Nokia Telecommunications Oy Method and arrangement for adjusting antenna pattern
US6154661A (en) 1997-12-10 2000-11-28 Arraycomm, Inc. Transmitting on the downlink using one or more weight vectors determined to achieve a desired radiation pattern
US6084917A (en) 1997-12-16 2000-07-04 Integrated Telecom Express Circuit for configuring and dynamically adapting data and energy parameters in a multi-channel communications system
US6175588B1 (en) 1997-12-30 2001-01-16 Motorola, Inc. Communication device and method for interference suppression using adaptive equalization in a spread spectrum communication system
US6088387A (en) 1997-12-31 2000-07-11 At&T Corp. Multi-channel parallel/serial concatenated convolutional codes and trellis coded modulation encoder/decoder
EP2254300B1 (en) 1998-01-06 2013-05-15 Mosaid Technologies Incorporated Multicarrier modulation system with variable symbol rates
US5982327A (en) 1998-01-12 1999-11-09 Motorola, Inc. Adaptive array method, device, base station and subscriber unit
US6608874B1 (en) 1998-01-12 2003-08-19 Hughes Electronics Corporation Method and apparatus for quadrature multi-pulse modulation of data for spectrally efficient communication
US5973638A (en) 1998-01-30 1999-10-26 Micronetics Wireless, Inc. Smart antenna channel simulator and test system
EP0938208A1 (en) 1998-02-22 1999-08-25 Sony International (Europe) GmbH Multicarrier transmission, compatible with the existing GSM system
JP3082756B2 (ja) 1998-02-27 2000-08-28 日本電気株式会社 マルチキャリア伝送システム及びその方法
AU2754899A (en) 1998-02-27 1999-09-15 Telefonaktiebolaget Lm Ericsson (Publ) Multiple access categorization for mobile station
US6141388A (en) 1998-03-11 2000-10-31 Ericsson Inc. Received signal quality determination method and systems for convolutionally encoded communication channels
US6058107A (en) 1998-04-08 2000-05-02 Motorola, Inc. Method for updating forward power control in a communication system
US6317466B1 (en) 1998-04-15 2001-11-13 Lucent Technologies Inc. Wireless communications system having a space-time architecture employing multi-element antennas at both the transmitter and receiver
US6615024B1 (en) 1998-05-01 2003-09-02 Arraycomm, Inc. Method and apparatus for determining signatures for calibrating a communication station having an antenna array
US7123628B1 (en) 1998-05-06 2006-10-17 Lg Electronics Inc. Communication system with improved medium access control sub-layer
US6205410B1 (en) 1998-06-01 2001-03-20 Globespan Semiconductor, Inc. System and method for bit loading with optimal margin assignment
EP1088412B1 (en) 1998-06-19 2007-12-26 Telefonaktiebolaget LM Ericsson (publ) Frame synchronization techniques and systems
US6795424B1 (en) 1998-06-30 2004-09-21 Tellabs Operations, Inc. Method and apparatus for interference suppression in orthogonal frequency division multiplexed (OFDM) wireless communication systems
JP2000092009A (ja) 1998-07-13 2000-03-31 Sony Corp 通信方法、送信機及び受信機
RU2183387C2 (ru) 1998-07-16 2002-06-10 Самсунг Электроникс Ко., Лтд. Обработка пакетированных данных в мобильной системе связи
US6154443A (en) 1998-08-11 2000-11-28 Industrial Technology Research Institute FFT-based CDMA RAKE receiver system and method
EP1119932A4 (en) 1998-08-18 2002-10-09 Beamreach Networks Inc DISCRETE MULTI-TONE COMMUNICATION TECHNOLOGY WITH STACKED CARRIERS
KR100429540B1 (ko) 1998-08-26 2004-08-09 삼성전자주식회사 이동통신시스템의패킷데이터통신장치및방법
US6515617B1 (en) 1998-09-01 2003-02-04 Hughes Electronics Corporation Method and system for position determination using geostationary earth orbit satellite
DE19842712C1 (de) 1998-09-17 2000-05-04 Siemens Ag Verfahren und Anordnung zur Minimierung des Autokorrelationsfehlers bei der Demodulation eines Spreizspektrum-Signals unter Mehrwegeausbreitung
US6292917B1 (en) 1998-09-30 2001-09-18 Agere Systems Guardian Corp. Unequal error protection for digital broadcasting using channel classification
EP0993211B1 (en) 1998-10-05 2005-01-12 Sony International (Europe) GmbH Random access channel partitioning scheme for CDMA system
EP0993212B1 (en) 1998-10-05 2006-05-24 Sony Deutschland GmbH Random access channel partitioning scheme for CDMA system
US6711121B1 (en) 1998-10-09 2004-03-23 At&T Corp. Orthogonal code division multiplexing for twisted pair channels
ES2183651T3 (es) 1998-10-27 2003-03-16 Siemens Ag Procedimiento de asignacion de canal y dispositivo para conjuntos de informacion codificados y combinados.
JP4287536B2 (ja) 1998-11-06 2009-07-01 パナソニック株式会社 Ｏｆｄｍ送受信装置及びｏｆｄｍ送受信方法
AU1966699A (en) 1998-12-03 2000-07-03 Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V. Apparatus and method for transmitting information and apparatus and method for receiving information
GB9827182D0 (en) * 1998-12-10 1999-02-03 Philips Electronics Nv Radio communication system
FI108588B (fi) 1998-12-15 2002-02-15 Nokia Corp Menetelmä ja radiojärjestelmä digitaalisen signaalin siirtoon
JP2000244441A (ja) 1998-12-22 2000-09-08 Matsushita Electric Ind Co Ltd Ｏｆｄｍ送受信装置
US6266528B1 (en) 1998-12-23 2001-07-24 Arraycomm, Inc. Performance monitor for antenna arrays
US6310909B1 (en) 1998-12-23 2001-10-30 Broadcom Corporation DSL rate adaptation
US6463290B1 (en) 1999-01-08 2002-10-08 Trueposition, Inc. Mobile-assisted network based techniques for improving accuracy of wireless location system
US6348036B1 (en) 1999-01-24 2002-02-19 Genzyme Corporation Surgical retractor and tissue stabilization device
RU2152132C1 (ru) 1999-01-26 2000-06-27 Государственное унитарное предприятие Воронежский научно-исследовательский институт связи Линия радиосвязи с пространственной модуляцией
JP3619729B2 (ja) 2000-01-19 2005-02-16 松下電器産業株式会社 無線受信装置および無線受信方法
KR100651457B1 (ko) 1999-02-13 2006-11-28 삼성전자주식회사 부호분할다중접속 이동통신시스템의 불연속 전송모드에서 연속적인 외부순환 전력제어장치 및 방법
US6574267B1 (en) 1999-03-22 2003-06-03 Golden Bridge Technology, Inc. Rach ramp-up acknowledgement
US6346910B1 (en) 1999-04-07 2002-02-12 Tei Ito Automatic array calibration scheme for wireless point-to-multipoint communication networks
US6363267B1 (en) 1999-04-07 2002-03-26 Telefonaktiebolaget Lm Ericsson (Publ) Mobile terminal decode failure procedure in a wireless local area network
EP1075093A1 (en) 1999-08-02 2001-02-07 Interuniversitair Micro-Elektronica Centrum Vzw A method and apparatus for multi-user transmission
US6594798B1 (en) 1999-05-21 2003-07-15 Microsoft Corporation Receiver-driven layered error correction multicast over heterogeneous packet networks
US6532562B1 (en) 1999-05-21 2003-03-11 Microsoft Corp Receiver-driven layered error correction multicast over heterogeneous packet networks
US6594473B1 (en) 1999-05-28 2003-07-15 Texas Instruments Incorporated Wireless system with transmitter having multiple transmit antennas and combining open loop and closed loop transmit diversities
KR100605978B1 (ko) 1999-05-29 2006-07-28 삼성전자주식회사 부호분할다중접속 이동통신시스템의 불연속 전송모드에서 연속적인 외부순환 전력제어를 위한 송수신 장치 및 방법
US7072410B1 (en) 1999-06-01 2006-07-04 Peter Monsen Multiple access system and method for multibeam digital radio systems
US6141567A (en) 1999-06-07 2000-10-31 Arraycomm, Inc. Apparatus and method for beamforming in a changing-interference environment
US6385264B1 (en) 1999-06-08 2002-05-07 Qualcomm Incorporated Method and apparatus for mitigating interference between base stations in a wideband CDMA system
US6976262B1 (en) 1999-06-14 2005-12-13 Sun Microsystems, Inc. Web-based enterprise management with multiple repository capability
KR100330244B1 (ko) 1999-07-08 2002-03-25 윤종용 이동 통신시스템의 데이터 레이트 검출 장치 및 방법
US6163296A (en) 1999-07-12 2000-12-19 Lockheed Martin Corp. Calibration and integrated beam control/conditioning system for phased-array antennas
RU2168278C2 (ru) 1999-07-16 2001-05-27 Корпорация "Самсунг Электроникс" Способ произвольного доступа абонентов мобильной станции
US6532225B1 (en) * 1999-07-27 2003-03-11 At&T Corp Medium access control layer for packetized wireless systems
JP2001044930A (ja) 1999-07-30 2001-02-16 Matsushita Electric Ind Co Ltd 無線通信装置および無線通信方法
US6067290A (en) 1999-07-30 2000-05-23 Gigabit Wireless, Inc. Spatial multiplexing in a cellular network
US6735188B1 (en) * 1999-08-27 2004-05-11 Tachyon, Inc. Channel encoding and decoding method and apparatus
US6278726B1 (en) 1999-09-10 2001-08-21 Interdigital Technology Corporation Interference cancellation in a spread spectrum communication system
US6115406A (en) 1999-09-10 2000-09-05 Interdigital Technology Corporation Transmission using an antenna array in a CDMA communication system
US6426971B1 (en) 1999-09-13 2002-07-30 Qualcomm Incorporated System and method for accurately predicting signal to interference and noise ratio to improve communications system performance
SG80071A1 (en) 1999-09-24 2001-04-17 Univ Singapore Downlink beamforming method
JP3421671B2 (ja) 1999-09-30 2003-06-30 独立行政法人通信総合研究所 通信システム、選択装置、送信装置、受信装置、選択方法、送信方法、受信方法、および、情報記録媒体
JP3961829B2 (ja) 1999-10-02 2007-08-22 サムスン エレクトロニクス カンパニー リミテッド 符号分割多重接続通信システムの制御チャネル信号を断続的に送受信する装置及び方法
DE19950005A1 (de) * 1999-10-18 2001-04-19 Bernhard Walke Verfahren zum Betrieb drahtloser Basisstationen für paketvermittelnde Funksysteme mit garantierter Dienstgüte
DE19951525C2 (de) 1999-10-26 2002-01-24 Siemens Ag Verfahren zum Kalibrieren einer elektronisch phasengesteuerten Gruppenantenne in Funk-Kommunikationssystemen
US6492942B1 (en) 1999-11-09 2002-12-10 Com Dev International, Inc. Content-based adaptive parasitic array antenna system
JP3416597B2 (ja) 1999-11-19 2003-06-16 三洋電機株式会社 無線基地局
US7088671B1 (en) 1999-11-24 2006-08-08 Peter Monsen Multiple access technique for downlink multibeam digital radio systems
US7110785B1 (en) 1999-12-03 2006-09-19 Nortel Networks Limited Performing power control in a mobile communications system
US6351499B1 (en) 1999-12-15 2002-02-26 Iospan Wireless, Inc. Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter
US6298092B1 (en) 1999-12-15 2001-10-02 Iospan Wireless, Inc. Methods of controlling communication parameters of wireless systems
EP1109326A1 (en) 1999-12-15 2001-06-20 Lucent Technologies Inc. Peamble detector for a CDMA receiver
JP3975629B2 (ja) 1999-12-16 2007-09-12 ソニー株式会社 画像復号装置及び画像復号方法
US6298035B1 (en) 1999-12-21 2001-10-02 Nokia Networks Oy Estimation of two propagation channels in OFDM
JP2001186051A (ja) 1999-12-24 2001-07-06 Toshiba Corp データ信号判定回路及び方法
CN100385833C (zh) 1999-12-28 2008-04-30 株式会社Ntt都科摩 路径搜索方法与信道估计方法以及通信装置
US6718160B2 (en) 1999-12-29 2004-04-06 Airnet Communications Corp. Automatic configuration of backhaul and groundlink frequencies in a wireless repeater
US6888809B1 (en) 2000-01-13 2005-05-03 Lucent Technologies Inc. Space-time processing for multiple-input, multiple-output, wireless systems
US7254171B2 (en) 2000-01-20 2007-08-07 Nortel Networks Limited Equaliser for digital communications systems and method of equalisation
KR100325367B1 (ko) 2000-01-28 2002-03-04 박태진 직교 주파수 분할 다중 통신 시스템에서의 비트 오율 측정장치및 방법
JP2001217896A (ja) 2000-01-31 2001-08-10 Matsushita Electric Works Ltd 無線データ通信システム
US7003044B2 (en) 2000-02-01 2006-02-21 Sasken Communication Technologies Ltd. Method for allocating bits and power in multi-carrier communication system
FI117465B (fi) 2000-02-03 2006-10-31 Danisco Sweeteners Oy Menetelmä pureskeltavien ytimien kovapinnoittamiseksi
US6868120B2 (en) 2000-02-08 2005-03-15 Clearwire Corporation Real-time system for measuring the Ricean K-factor
US6704374B1 (en) 2000-02-16 2004-03-09 Thomson Licensing S.A. Local oscillator frequency correction in an orthogonal frequency division multiplexing system
DE10008653A1 (de) 2000-02-24 2001-09-06 Siemens Ag Verbesserungen an einem Funkkommunikationssystem
US6956814B1 (en) 2000-02-29 2005-10-18 Worldspace Corporation Method and apparatus for mobile platform reception and synchronization in direct digital satellite broadcast system
JP2001244879A (ja) 2000-03-02 2001-09-07 Matsushita Electric Ind Co Ltd 送信電力制御装置及びその方法
EP1137217A1 (en) 2000-03-20 2001-09-26 Telefonaktiebolaget Lm Ericsson ARQ parameter negociation in a data packet transmission system using link adaptation
US6952454B1 (en) 2000-03-22 2005-10-04 Qualcomm, Incorporated Multiplexing of real time services and non-real time services for OFDM systems
US6473467B1 (en) 2000-03-22 2002-10-29 Qualcomm Incorporated Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system
US20020154705A1 (en) 2000-03-22 2002-10-24 Walton Jay R. High efficiency high performance communications system employing multi-carrier modulation
DE10014676C2 (de) 2000-03-24 2002-02-07 Polytrax Inf Technology Ag Datenübertragung über ein Stromversorgungsnetz
US7113499B2 (en) 2000-03-29 2006-09-26 Texas Instruments Incorporated Wireless communication
EP1143754B1 (en) 2000-04-04 2007-06-27 Sony Deutschland GmbH Event triggered change of access service class in a random access channel
DE60021772T2 (de) 2000-04-07 2006-04-20 Nokia Corp. Verfahren und vorrichtung zur übertragung mit mehreren antennen
US7289570B2 (en) 2000-04-10 2007-10-30 Texas Instruments Incorporated Wireless communications
US6757263B1 (en) 2000-04-13 2004-06-29 Motorola, Inc. Wireless repeating subscriber units
US20020009155A1 (en) 2000-04-18 2002-01-24 Tzannes Marcos C. Systems and methods for a multicarrier modulation system with a variable margin
US6751199B1 (en) 2000-04-24 2004-06-15 Qualcomm Incorporated Method and apparatus for a rate control in a high data rate communication system
JP3414357B2 (ja) 2000-04-25 2003-06-09 日本電気株式会社 Ｃｄｍａ移動通信システムにおける送信電力制御方式
DE60024502T2 (de) * 2000-04-25 2006-08-24 Nortel Networks Ltd., St. Laurent Drahtloses Telekommunikationssystem mit einer reduzierten Verzögerung für die Datenübermittlung
US7068628B2 (en) 2000-05-22 2006-06-27 At&T Corp. MIMO OFDM system
US7139324B1 (en) 2000-06-02 2006-11-21 Nokia Networks Oy Closed loop feedback system for improved down link performance
US6744811B1 (en) 2000-06-12 2004-06-01 Actelis Networks Inc. Bandwidth management for DSL modem pool
US7512086B2 (en) 2000-06-12 2009-03-31 Samsung Electronics Co., Ltd Method of assigning an uplink random access channel in a CDMA mobile communication system
US7248841B2 (en) 2000-06-13 2007-07-24 Agee Brian G Method and apparatus for optimization of wireless multipoint electromagnetic communication networks
US6628702B1 (en) 2000-06-14 2003-09-30 Qualcomm, Incorporated Method and apparatus for demodulating signals processed in a transmit diversity mode
US6760313B1 (en) 2000-06-19 2004-07-06 Qualcomm Incorporated Method and apparatus for adaptive rate selection in a communication system
SE519303C2 (sv) 2000-06-20 2003-02-11 Ericsson Telefon Ab L M Anordning för smalbandig kommunikation i ett multicarrier- system
US6891858B1 (en) 2000-06-30 2005-05-10 Cisco Technology Inc. Dynamic modulation of modulation profiles for communication channels in an access network
WO2002003557A1 (en) 2000-06-30 2002-01-10 Iospan Wireless, Inc. Method and system for mode adaptation in wireless communication
CN1140147C (zh) 2000-07-01 2004-02-25 信息产业部电信传输研究所 一种外环功率控制的方法和系统
AU2001267891A1 (en) 2000-07-03 2002-01-14 Matsushita Electric Industrial Co., Ltd. Base station unit and method for radio communication
EP1170897B1 (en) 2000-07-05 2020-01-15 Wi-Fi One Technologies International Limited Pilot pattern design for a STTD scheme in an OFDM system
FI109393B (fi) 2000-07-14 2002-07-15 Nokia Corp Menetelmä mediavirran enkoodaamiseksi skaalautuvasti, skaalautuva enkooderi ja päätelaite
WO2002007327A1 (en) 2000-07-17 2002-01-24 Koninklijke Philips Electronics N.V. Coding of data stream
KR100493152B1 (ko) 2000-07-21 2005-06-02 삼성전자주식회사 이동 통신 시스템에서의 전송 안테나 다이버시티 방법 및이를 위한 기지국 장치 및 이동국 장치
EP1176750A1 (en) 2000-07-25 2002-01-30 Telefonaktiebolaget L M Ericsson (Publ) Link quality determination of a transmission link in an OFDM transmission system
DE60035683T2 (de) 2000-08-01 2008-06-26 Sony Deutschland Gmbh Frequenzwiederverwendungsschema für OFDM-Systeme
US6920192B1 (en) 2000-08-03 2005-07-19 Lucent Technologies Inc. Adaptive antenna array methods and apparatus for use in a multi-access wireless communication system
AU2001284723A1 (en) 2000-08-03 2002-02-18 Morphics Technology, Inc. Dynamically reconfigurable universal transmitter system
DE60037545T2 (de) 2000-08-10 2008-12-04 Fujitsu Ltd., Kawasaki Senderdiversität Kommunikationsvorrichtung
US6582088B2 (en) 2000-08-10 2003-06-24 Benq Corporation Optical path folding apparatus
KR100526499B1 (ko) 2000-08-22 2005-11-08 삼성전자주식회사 두 개 이상 안테나를 사용하는 안테나 전송 다이버시티방법 및 장치
EP1182799A3 (en) 2000-08-22 2002-06-26 Lucent Technologies Inc. Method for enhancing mobile cdma communications using space-time transmit diversity
IT1318790B1 (it) 2000-08-29 2003-09-10 Cit Alcatel Metodo per gestire il cambio di allocazione dei time-slot in reti adanello ms-spring di tipo transoceanico.
US6985434B2 (en) 2000-09-01 2006-01-10 Nortel Networks Limited Adaptive time diversity and spatial diversity for OFDM
US6850481B2 (en) 2000-09-01 2005-02-01 Nortel Networks Limited Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system
US7233625B2 (en) 2000-09-01 2007-06-19 Nortel Networks Limited Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system
US7009931B2 (en) 2000-09-01 2006-03-07 Nortel Networks Limited Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications
US6937592B1 (en) 2000-09-01 2005-08-30 Intel Corporation Wireless communications system that supports multiple modes of operation
FR2814014B1 (fr) 2000-09-14 2002-10-11 Mitsubishi Electric Inf Tech Methode de detection multi-utilisateur
US6760882B1 (en) 2000-09-19 2004-07-06 Intel Corporation Mode selection for data transmission in wireless communication channels based on statistical parameters
US6802035B2 (en) 2000-09-19 2004-10-05 Intel Corporation System and method of dynamically optimizing a transmission mode of wirelessly transmitted information
US7062294B1 (en) 2000-09-29 2006-06-13 Arraycomm, Llc. Downlink transmission in a wireless data communication system having a base station with a smart antenna system
US6650714B2 (en) 2000-11-30 2003-11-18 Arraycomm, Inc. Spatial processing and timing estimation using a training sequence in a radio communications system
US7110378B2 (en) 2000-10-03 2006-09-19 Wisconsin Alumni Research Foundation Channel aware optimal space-time signaling for wireless communication over wideband multipath channels
US7016296B2 (en) 2000-10-16 2006-03-21 Broadcom Corporation Adaptive modulation for fixed wireless link in cable transmission system
US6907270B1 (en) 2000-10-23 2005-06-14 Qualcomm Inc. Method and apparatus for reduced rank channel estimation in a communications system
US6369758B1 (en) 2000-11-01 2002-04-09 Unique Broadband Systems, Inc. Adaptive antenna array for mobile communication
JP3553038B2 (ja) 2000-11-06 2004-08-11 株式会社エヌ・ティ・ティ・ドコモ 信号送信方法、信号受信方法、送信装置、受信装置および記録媒体
US6768727B1 (en) 2000-11-09 2004-07-27 Ericsson Inc. Fast forward link power control for CDMA system
US8634481B1 (en) 2000-11-16 2014-01-21 Alcatel Lucent Feedback technique for wireless systems with multiple transmit and receive antennas
US6980601B2 (en) 2000-11-17 2005-12-27 Broadcom Corporation Rate adaptation and parameter optimization for multi-band single carrier transmission
US7006464B1 (en) 2000-11-17 2006-02-28 Lucent Technologies Inc. Downlink and uplink channel structures for downlink shared channel system
JP3695316B2 (ja) 2000-11-24 2005-09-14 株式会社日本自動車部品総合研究所 スペクトラム拡散受信機の相関検出器
US6751480B2 (en) 2000-12-01 2004-06-15 Lucent Technologies Inc. Method for simultaneously conveying information to multiple mobiles with multiple antennas
JP4505677B2 (ja) 2000-12-06 2010-07-21 ソフトバンクテレコム株式会社 送信ダイバーシチ装置および送信電力調整方法
US6952426B2 (en) 2000-12-07 2005-10-04 Nortel Networks Limited Method and apparatus for the transmission of short data bursts in CDMA/HDR networks
KR100353641B1 (ko) 2000-12-21 2002-09-28 삼성전자 주식회사 부호분할다중접속 이동통신시스템의 기지국 전송 안테나다이버시티 장치 및 방법
US6850498B2 (en) 2000-12-22 2005-02-01 Intel Corporation Method and system for evaluating a wireless link
US6987819B2 (en) 2000-12-29 2006-01-17 Motorola, Inc. Method and device for multiple input/multiple output transmit and receive weights for equal-rate data streams
US7050510B2 (en) 2000-12-29 2006-05-23 Lucent Technologies Inc. Open-loop diversity technique for systems employing four transmitter antennas
US20020085641A1 (en) 2000-12-29 2002-07-04 Motorola, Inc Method and system for interference averaging in a wireless communication system
US6731668B2 (en) 2001-01-05 2004-05-04 Qualcomm Incorporated Method and system for increased bandwidth efficiency in multiple input—multiple output channels
EP1223776A1 (en) 2001-01-12 2002-07-17 Siemens Information and Communication Networks S.p.A. A collision free access scheduling in cellular TDMA-CDMA networks
US6693992B2 (en) 2001-01-16 2004-02-17 Mindspeed Technologies Line probe signal and method of use
US6801790B2 (en) 2001-01-17 2004-10-05 Lucent Technologies Inc. Structure for multiple antenna configurations
US7164669B2 (en) 2001-01-19 2007-01-16 Adaptix, Inc. Multi-carrier communication with time division multiplexing and carrier-selective loading
US7054662B2 (en) 2001-01-24 2006-05-30 Qualcomm, Inc. Method and system for forward link beam forming in wireless communications
JP2002232943A (ja) 2001-01-29 2002-08-16 Sony Corp データ送信処理方法、データ受信処理方法、送信機、受信機、およびセルラー無線通信システム
GB0102316D0 (en) 2001-01-30 2001-03-14 Koninkl Philips Electronics Nv Radio communication system
US6961388B2 (en) 2001-02-01 2005-11-01 Qualcomm, Incorporated Coding scheme for a wireless communication system
US6885654B2 (en) 2001-02-06 2005-04-26 Interdigital Technology Corporation Low complexity data detection using fast fourier transform of channel correlation matrix
US7120134B2 (en) 2001-02-15 2006-10-10 Qualcomm, Incorporated Reverse link channel architecture for a wireless communication system
US6975868B2 (en) 2001-02-21 2005-12-13 Qualcomm Incorporated Method and apparatus for IS-95B reverse link supplemental code channel frame validation and fundamental code channel rate decision improvement
US7006483B2 (en) 2001-02-23 2006-02-28 Ipr Licensing, Inc. Qualifying available reverse link coding rates from access channel power setting
WO2002069523A1 (en) 2001-02-26 2002-09-06 Magnolia Broadband, Inc Smart antenna based spectrum multiplexing using a pilot signal
GB0105019D0 (en) * 2001-03-01 2001-04-18 Koninkl Philips Electronics Nv Antenna diversity in a wireless local area network
US7039125B2 (en) 2001-03-12 2006-05-02 Analog Devices, Inc. Equalized SNR power back-off
EP1241824A1 (en) 2001-03-14 2002-09-18 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Multiplexing method in a multicarrier transmit diversity system
US6478422B1 (en) 2001-03-19 2002-11-12 Richard A. Hansen Single bifocal custom shooters glasses
US7046746B1 (en) 2001-03-19 2006-05-16 Cisco Systems Wireless Networking (Australia) Pty Limited Adaptive Viterbi decoder for a wireless data network receiver
US6771706B2 (en) 2001-03-23 2004-08-03 Qualcomm Incorporated Method and apparatus for utilizing channel state information in a wireless communication system
US7248638B1 (en) 2001-03-23 2007-07-24 Lsi Logic Transmit antenna multi-mode tracking
US7386076B2 (en) 2001-03-29 2008-06-10 Texas Instruments Incorporated Space time encoded wireless communication system with multipath resolution receivers
GB2373973B (en) 2001-03-30 2003-06-11 Toshiba Res Europ Ltd Adaptive antenna
US8290098B2 (en) 2001-03-30 2012-10-16 Texas Instruments Incorporated Closed loop multiple transmit, multiple receive antenna wireless communication system
US20020176485A1 (en) 2001-04-03 2002-11-28 Hudson John E. Multi-cast communication system and method of estimating channel impulse responses therein
US6785513B1 (en) 2001-04-05 2004-08-31 Cowave Networks, Inc. Method and system for clustered wireless networks
US6859503B2 (en) 2001-04-07 2005-02-22 Motorola, Inc. Method and system in a transceiver for controlling a multiple-input, multiple-output communications channel
KR100510434B1 (ko) 2001-04-09 2005-08-26 니폰덴신뎅와 가부시키가이샤 Ｏｆｄｍ신호전달 시스템, ｏｆｄｍ신호 송신장치 및ｏｆｄｍ신호 수신장치
FR2823620B1 (fr) 2001-04-12 2003-08-15 France Telecom Procede de codage/decodage d'un flux de donnees numeriques codees avec entrelacement sur bits en emission et en reception multiple en presence d'interference intersymboles et systeme correspondant
US7310304B2 (en) 2001-04-24 2007-12-18 Bae Systems Information And Electronic Systems Integration Inc. Estimating channel parameters in multi-input, multi-output (MIMO) systems
US6611231B2 (en) 2001-04-27 2003-08-26 Vivato, Inc. Wireless packet switched communication systems and networks using adaptively steered antenna arrays
US7133459B2 (en) 2001-05-01 2006-11-07 Texas Instruments Incorporated Space-time transmit diversity
US7480278B2 (en) 2001-05-04 2009-01-20 Nokia Corporation Admission control with directional antenna
EP1255369A1 (en) 2001-05-04 2002-11-06 TELEFONAKTIEBOLAGET LM ERICSSON (publ) Link adaptation for wireless MIMO transmission schemes
DE10122788A1 (de) 2001-05-10 2002-06-06 Basf Ag Verfahren der kristallisativen Reinigung einer Roh-Schmelze wenigstens eines Monomeren
US6785341B2 (en) 2001-05-11 2004-08-31 Qualcomm Incorporated Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information
US6718493B1 (en) 2001-05-17 2004-04-06 3Com Corporation Method and apparatus for selection of ARQ parameters and estimation of improved communications
US7688899B2 (en) 2001-05-17 2010-03-30 Qualcomm Incorporated Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion
US7072413B2 (en) 2001-05-17 2006-07-04 Qualcomm, Incorporated Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion
US6751187B2 (en) 2001-05-17 2004-06-15 Qualcomm Incorporated Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel transmission
US7492737B1 (en) 2001-05-23 2009-02-17 Nortel Networks Limited Service-driven air interface protocol architecture for wireless systems
ES2188373B1 (es) 2001-05-25 2004-10-16 Diseño De Sistemas En Silencio, S.A. Procedimiento de optimizacion de la comunicacion para sistema de transmision digital ofdm multiusuario sobre red electrica.
US6920194B2 (en) 2001-05-29 2005-07-19 Tioga Technologies, Ltd. Method and system for detecting, timing, and correcting impulse noise
US7158563B2 (en) 2001-06-01 2007-01-02 The Board Of Trustees Of The Leland Stanford Junior University Dynamic digital communication system control
US20020183010A1 (en) 2001-06-05 2002-12-05 Catreux Severine E. Wireless communication systems with adaptive channelization and link adaptation
GB2376315B (en) 2001-06-05 2003-08-06 3Com Corp Data bus system including posted reads and writes
US7190749B2 (en) 2001-06-06 2007-03-13 Qualcomm Incorporated Method and apparatus for canceling pilot interference in a wireless communication system
US20020193146A1 (en) 2001-06-06 2002-12-19 Mark Wallace Method and apparatus for antenna diversity in a wireless communication system
DE60127944T2 (de) 2001-06-08 2007-09-06 Sony Deutschland Gmbh Mehrträgersystem mit adaptiver bitweiser verschachtelung
US20030012308A1 (en) 2001-06-13 2003-01-16 Sampath Hemanth T. Adaptive channel estimation for wireless systems
US7027523B2 (en) 2001-06-22 2006-04-11 Qualcomm Incorporated Method and apparatus for transmitting data in a time division duplexed (TDD) communication system
US6842460B1 (en) * 2001-06-27 2005-01-11 Nokia Corporation Ad hoc network discovery menu
CN1547861A (zh) 2001-06-27 2004-11-17 ���˹���Ѷ��� 无线通信系统中控制信息的传递
US6751444B1 (en) 2001-07-02 2004-06-15 Broadstorm Telecommunications, Inc. Method and apparatus for adaptive carrier allocation and power control in multi-carrier communication systems
FR2827731B1 (fr) 2001-07-23 2004-01-23 Nexo Haut-parleur a radiation directe et rayonnement optimise
US6996380B2 (en) 2001-07-26 2006-02-07 Ericsson Inc. Communication system employing transmit macro-diversity
US6738020B1 (en) 2001-07-31 2004-05-18 Arraycomm, Inc. Estimation of downlink transmission parameters in a radio communications system with an adaptive antenna array
ATE400097T1 (de) 2001-08-13 2008-07-15 Motorola Inc Drahtlose kommunikation mit sendediversität
KR100703295B1 (ko) 2001-08-18 2007-04-03 삼성전자주식회사 이동통신시스템에서 안테나 어레이를 이용한 데이터 송/수신 장치 및 방법
US20030039317A1 (en) 2001-08-21 2003-02-27 Taylor Douglas Hamilton Method and apparatus for constructing a sub-carrier map
FR2828981B1 (fr) 2001-08-23 2004-05-21 Commissariat Energie Atomique Creuset a chauffage par induction et refroidissement par caloducs
EP1289328A1 (en) 2001-08-28 2003-03-05 Lucent Technologies Inc. A method of sending control information in a wireless telecommunications network, and corresponding apparatus
US6990059B1 (en) 2001-09-05 2006-01-24 Cisco Technology, Inc. Interference mitigation in a wireless communication system
FR2829326A1 (fr) 2001-09-06 2003-03-07 France Telecom Procede et systeme de reception iterative sous optimale pour systeme de transmission haut debit cdma
US7149254B2 (en) 2001-09-06 2006-12-12 Intel Corporation Transmit signal preprocessing based on transmit antennae correlations for multiple antennae systems
US7133070B2 (en) 2001-09-20 2006-11-07 Eastman Kodak Company System and method for deciding when to correct image-specific defects based on camera, scene, display and demographic data
US7024163B1 (en) 2001-09-28 2006-04-04 Arraycomm Llc Method and apparatus for adjusting feedback of a remote unit
US7277679B1 (en) 2001-09-28 2007-10-02 Arraycomm, Llc Method and apparatus to provide multiple-mode spatial processing to a terminal unit
US6788948B2 (en) 2001-09-28 2004-09-07 Arraycomm, Inc. Frequency dependent calibration of a wideband radio system using narrowband channels
US7035359B2 (en) 2001-10-11 2006-04-25 Telefonaktiebolaget L.M. Ericsson Methods and apparatus for demodulation of a signal in a signal slot subject to a discontinuous interference signal
US7773699B2 (en) 2001-10-17 2010-08-10 Nortel Networks Limited Method and apparatus for channel quality measurements
US7548506B2 (en) 2001-10-17 2009-06-16 Nortel Networks Limited System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design
US7248559B2 (en) 2001-10-17 2007-07-24 Nortel Networks Limited Scattered pilot pattern and channel estimation method for MIMO-OFDM systems
US7116652B2 (en) 2001-10-18 2006-10-03 Lucent Technologies Inc. Rate control technique for layered architectures with multiple transmit and receive antennas
US7349667B2 (en) 2001-10-19 2008-03-25 Texas Instruments Incorporated Simplified noise estimation and/or beamforming for wireless communications
US20030119452A1 (en) 2001-10-19 2003-06-26 Samsung Electronics Co., Ltd. Apparatus and method for controlling transmission power of downlink data channel in a mobile communication system supporting MBMS
US7130592B2 (en) 2001-10-31 2006-10-31 Matsushita Electric Industrial Co., Ltd. Radio transmission apparatus and radio communication method
US7218684B2 (en) 2001-11-02 2007-05-15 Interdigital Technology Corporation Method and system for code reuse and capacity enhancement using null steering
US7164649B2 (en) 2001-11-02 2007-01-16 Qualcomm, Incorporated Adaptive rate control for OFDM communication system
US20030125040A1 (en) 2001-11-06 2003-07-03 Walton Jay R. Multiple-access multiple-input multiple-output (MIMO) communication system
US8018903B2 (en) 2001-11-21 2011-09-13 Texas Instruments Incorporated Closed-loop transmit diversity scheme in frequency selective multipath channels
EP1450505B1 (en) 2001-11-28 2008-10-29 Fujitsu Limited Orthogonal frequency-division multiplex transmission method
US7346126B2 (en) 2001-11-28 2008-03-18 Telefonaktiebolaget L M Ericsson (Publ) Method and apparatus for channel estimation using plural channels
US7263119B1 (en) 2001-11-29 2007-08-28 Marvell International Ltd. Decoding method and apparatus
US7154936B2 (en) 2001-12-03 2006-12-26 Qualcomm, Incorporated Iterative detection and decoding for a MIMO-OFDM system
US6760388B2 (en) 2001-12-07 2004-07-06 Qualcomm Incorporated Time-domain transmit and receive processing with channel eigen-mode decomposition for MIMO systems
US7155171B2 (en) 2001-12-12 2006-12-26 Saraband Wireless Vector network analyzer applique for adaptive communications in wireless networks
US20030112745A1 (en) 2001-12-17 2003-06-19 Xiangyang Zhuang Method and system of operating a coded OFDM communication system
AU2002364572A1 (en) 2001-12-18 2003-07-09 Globespan Virata Incorporated System and method for rate enhanced shdsl
US7099398B1 (en) 2001-12-18 2006-08-29 Vixs, Inc. Method and apparatus for establishing non-standard data rates in a wireless communication system
JP4052835B2 (ja) 2001-12-28 2008-02-27 株式会社日立製作所 多地点中継を行う無線伝送システム及びそれに使用する無線装置
US7573805B2 (en) 2001-12-28 2009-08-11 Motorola, Inc. Data transmission and reception method and apparatus
CA2366397A1 (en) 2001-12-31 2003-06-30 Tropic Networks Inc. An interface for data transfer between integrated circuits
US7209433B2 (en) 2002-01-07 2007-04-24 Hitachi, Ltd. Channel estimation and compensation techniques for use in frequency division multiplexed systems
US7020110B2 (en) 2002-01-08 2006-03-28 Qualcomm Incorporated Resource allocation for MIMO-OFDM communication systems
US7020482B2 (en) 2002-01-23 2006-03-28 Qualcomm Incorporated Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems
US7058116B2 (en) 2002-01-25 2006-06-06 Intel Corporation Receiver architecture for CDMA receiver downlink
US7283508B2 (en) 2002-02-07 2007-10-16 Samsung Electronics Co., Ltd. Apparatus and method for transmitting/receiving serving HS-SCCH set information in an HSDPA communication system
US7046978B2 (en) 2002-02-08 2006-05-16 Qualcomm, Inc. Method and apparatus for transmit pre-correction in wireless communications
US6980800B2 (en) * 2002-02-12 2005-12-27 Hughes Network Systems System and method for providing contention channel organization for broadband satellite access in a communications network
US7292854B2 (en) 2002-02-15 2007-11-06 Lucent Technologies Inc. Express signaling in a wireless communication system
US7076263B2 (en) 2002-02-19 2006-07-11 Qualcomm, Incorporated Power control for partial channel-state information (CSI) multiple-input, multiple-output (MIMO) systems
US20030162519A1 (en) 2002-02-26 2003-08-28 Martin Smith Radio communications device
US6862271B2 (en) 2002-02-26 2005-03-01 Qualcomm Incorporated Multiple-input, multiple-output (MIMO) systems with multiple transmission modes
US6959171B2 (en) 2002-02-28 2005-10-25 Intel Corporation Data transmission rate control
US6636568B2 (en) 2002-03-01 2003-10-21 Qualcomm Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (MIMO) system
US6687492B1 (en) 2002-03-01 2004-02-03 Cognio, Inc. System and method for antenna diversity using joint maximal ratio combining
US6873651B2 (en) 2002-03-01 2005-03-29 Cognio, Inc. System and method for joint maximal ratio combining using time-domain signal processing
JP3561510B2 (ja) 2002-03-22 2004-09-02 松下電器産業株式会社 基地局装置及びパケット伝送方法
US7042858B1 (en) 2002-03-22 2006-05-09 Jianglei Ma Soft handoff for OFDM
US20040198276A1 (en) 2002-03-26 2004-10-07 Jose Tellado Multiple channel wireless receiver
US7012978B2 (en) 2002-03-26 2006-03-14 Intel Corporation Robust multiple chain receiver
US7197084B2 (en) 2002-03-27 2007-03-27 Qualcomm Incorporated Precoding for a multipath channel in a MIMO system
KR100456693B1 (ko) 2002-03-28 2004-11-10 삼성전자주식회사 다중채널 통신 시스템의 비트 할당을 최적화하여 셋업시간을 최소화하는 방법
US20030186650A1 (en) 2002-03-29 2003-10-02 Jung-Tao Liu Closed loop multiple antenna system
US7224704B2 (en) 2002-04-01 2007-05-29 Texas Instruments Incorporated Wireless network scheduling data frames including physical layer configuration
US7099377B2 (en) 2002-04-03 2006-08-29 Stmicroelectronics N.V. Method and device for interference cancellation in a CDMA wireless communication system
US6850741B2 (en) 2002-04-04 2005-02-01 Agency For Science, Technology And Research Method for selecting switched orthogonal beams for downlink diversity transmission
US7103325B1 (en) 2002-04-05 2006-09-05 Nortel Networks Limited Adaptive modulation and coding
US6804191B2 (en) 2002-04-05 2004-10-12 Flarion Technologies, Inc. Phase sequences for timing and access signals
US7623871B2 (en) 2002-04-24 2009-11-24 Qualcomm Incorporated Position determination for a wireless terminal in a hybrid position determination system
US7876726B2 (en) 2002-04-29 2011-01-25 Texas Instruments Incorporated Adaptive allocation of communications link channels to I- or Q-subchannel
US6690660B2 (en) 2002-05-22 2004-02-10 Interdigital Technology Corporation Adaptive algorithm for a Cholesky approximation
US7327800B2 (en) 2002-05-24 2008-02-05 Vecima Networks Inc. System and method for data detection in wireless communication systems
US6862440B2 (en) 2002-05-29 2005-03-01 Intel Corporation Method and system for multiple channel wireless transmitter and receiver phase and amplitude calibration
US7421039B2 (en) 2002-06-04 2008-09-02 Lucent Technologies Inc. Method and system employing antenna arrays
KR100498326B1 (ko) 2002-06-18 2005-07-01 엘지전자 주식회사 이동통신 단말기의 적응 변조 코딩 장치 및 방법
US7184713B2 (en) 2002-06-20 2007-02-27 Qualcomm, Incorporated Rate control for multi-channel communication systems
US7095709B2 (en) 2002-06-24 2006-08-22 Qualcomm, Incorporated Diversity transmission modes for MIMO OFDM communication systems
US7359313B2 (en) 2002-06-24 2008-04-15 Agere Systems Inc. Space-time bit-interleaved coded modulation for wideband transmission
US7613248B2 (en) 2002-06-24 2009-11-03 Qualcomm Incorporated Signal processing with channel eigenmode decomposition and channel inversion for MIMO systems
EP1520360B1 (en) 2002-06-27 2007-01-24 Koninklijke Philips Electronics N.V. Measurement of channel characterisitics in a communication system
US7551546B2 (en) * 2002-06-27 2009-06-23 Nortel Networks Limited Dual-mode shared OFDM methods/transmitters, receivers and systems
US7342912B1 (en) 2002-06-28 2008-03-11 Arraycomm, Llc. Selection of user-specific transmission parameters for optimization of transmit performance in wireless communications using a common pilot channel
EP1379020A1 (en) 2002-07-03 2004-01-07 National University Of Singapore A wireless communication apparatus and method
US7912999B2 (en) 2002-07-03 2011-03-22 Freescale Semiconductor, Inc. Buffering method and apparatus for processing digital communication signals
US20040017785A1 (en) 2002-07-16 2004-01-29 Zelst Allert Van System for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to/from a central processing base station
US6683916B1 (en) 2002-07-17 2004-01-27 Philippe Jean-Marc Sartori Adaptive modulation/coding and power allocation system
US6885708B2 (en) 2002-07-18 2005-04-26 Motorola, Inc. Training prefix modulation method and receiver
KR20040011653A (ko) 2002-07-29 2004-02-11 삼성전자주식회사 채널 특성에 적응적인 직교 주파수 분할 다중 통신 방법및 장치
EP1983651B1 (en) 2002-07-30 2014-11-05 IPR Licensing, Inc. Device for multiple-input multiple output (MIMO) radio communication
US6961595B2 (en) * 2002-08-08 2005-11-01 Flarion Technologies, Inc. Methods and apparatus for operating mobile nodes in multiple states
US7653415B2 (en) 2002-08-21 2010-01-26 Broadcom Corporation Method and system for increasing data rate in a mobile terminal using spatial multiplexing for DVB-H communication
EP1392004B1 (en) 2002-08-22 2009-01-21 Interuniversitair Microelektronica Centrum Vzw Method for multi-user MIMO transmission and apparatuses suited therefore
US20040037257A1 (en) * 2002-08-23 2004-02-26 Koninklijke Philips Electronics N.V. Method and apparatus for assuring quality of service in wireless local area networks
US8194770B2 (en) 2002-08-27 2012-06-05 Qualcomm Incorporated Coded MIMO systems with selective channel inversion applied per eigenmode
US6940917B2 (en) 2002-08-27 2005-09-06 Qualcomm, Incorporated Beam-steering and beam-forming for wideband MIMO/MISO systems
WO2004023674A1 (en) * 2002-09-06 2004-03-18 Nokia Corporation Antenna selection method
US7260153B2 (en) 2002-09-09 2007-08-21 Mimopro Ltd. Multi input multi output wireless communication method and apparatus providing extended range and extended rate across imperfectly estimated channels
US20040052228A1 (en) 2002-09-16 2004-03-18 Jose Tellado Method and system of frequency and time synchronization of a transceiver to signals received by the transceiver
US7426176B2 (en) 2002-09-30 2008-09-16 Lucent Technologies Inc. Method of power allocation and rate control in OFDMA systems
US7961774B2 (en) 2002-10-15 2011-06-14 Texas Instruments Incorporated Multipath interference-resistant receivers for closed-loop transmit diversity (CLTD) in code-division multiple access (CDMA) systems
US6850511B2 (en) 2002-10-15 2005-02-01 Intech 21, Inc. Timely organized ad hoc network and protocol for timely organized ad hoc network
US7453844B1 (en) * 2002-10-22 2008-11-18 Hong Kong Applied Science and Technology Research Institute, Co., Ltd. Dynamic allocation of channels in a wireless network
US7200404B2 (en) 2002-10-22 2007-04-03 Texas Instruments Incorporated Information storage to support wireless communication in non-exclusive spectrum
US8169944B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Random access for wireless multiple-access communication systems
US7002900B2 (en) 2002-10-25 2006-02-21 Qualcomm Incorporated Transmit diversity processing for a multi-antenna communication system
US8570988B2 (en) 2002-10-25 2013-10-29 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8134976B2 (en) 2002-10-25 2012-03-13 Qualcomm Incorporated Channel calibration for a time division duplexed communication system
US8170513B2 (en) 2002-10-25 2012-05-01 Qualcomm Incorporated Data detection and demodulation for wireless communication systems
US8208364B2 (en) 2002-10-25 2012-06-26 Qualcomm Incorporated MIMO system with multiple spatial multiplexing modes
BR0315664A (pt) 2002-10-25 2005-08-30 Qualcomm Inc Detecção e demodulação de dados para sistemas de comunicação sem fio
US7324429B2 (en) 2002-10-25 2008-01-29 Qualcomm, Incorporated Multi-mode terminal in a wireless MIMO system
US7151809B2 (en) 2002-10-25 2006-12-19 Qualcomm, Incorporated Channel estimation and spatial processing for TDD MIMO systems
US20040081131A1 (en) 2002-10-25 2004-04-29 Walton Jay Rod OFDM communication system with multiple OFDM symbol sizes
US8320301B2 (en) 2002-10-25 2012-11-27 Qualcomm Incorporated MIMO WLAN system
US7986742B2 (en) 2002-10-25 2011-07-26 Qualcomm Incorporated Pilots for MIMO communication system
US8218609B2 (en) 2002-10-25 2012-07-10 Qualcomm Incorporated Closed-loop rate control for a multi-channel communication system
JP2006504324A (ja) 2002-10-26 2006-02-02 エレクトロニクス アンド テレコミュニケーションズ リサーチ インスチチュート ｃｏｍｂパターンシンボルの周波数跳躍直交周波数分割多重接続方法
US7317750B2 (en) 2002-10-31 2008-01-08 Lot 41 Acquisition Foundation, Llc Orthogonal superposition coding for direct-sequence communications
EP1416688A1 (en) 2002-10-31 2004-05-06 Motorola Inc. Iterative channel estimation in multicarrier receivers
US7280625B2 (en) 2002-12-11 2007-10-09 Qualcomm Incorporated Derivation of eigenvectors for spatial processing in MIMO communication systems
US7280467B2 (en) 2003-01-07 2007-10-09 Qualcomm Incorporated Pilot transmission schemes for wireless multi-carrier communication systems
US7058367B1 (en) 2003-01-31 2006-06-06 At&T Corp. Rate-adaptive methods for communicating over multiple input/multiple output wireless systems
US7583637B2 (en) 2003-01-31 2009-09-01 Alcatel-Lucent Usa Inc. Methods of controlling data rate in wireless communications systems
US20040176097A1 (en) 2003-02-06 2004-09-09 Fiona Wilson Allocation of sub channels of MIMO channels of a wireless network
EP1447934A1 (en) 2003-02-12 2004-08-18 Institut Eurecom G.I.E. Transmission and reception diversity process for wireless communications
JP2004266586A (ja) 2003-03-03 2004-09-24 Hitachi Ltd 移動通信システムのデータ送受信方法
JP4250002B2 (ja) 2003-03-05 2009-04-08 富士通株式会社 適応型変調伝送システム及び適応型変調制御方法
US6927728B2 (en) 2003-03-13 2005-08-09 Motorola, Inc. Method and apparatus for multi-antenna transmission
US7822140B2 (en) 2003-03-17 2010-10-26 Broadcom Corporation Multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining
US7885228B2 (en) 2003-03-20 2011-02-08 Qualcomm Incorporated Transmission mode selection for data transmission in a multi-channel communication system
JP4259897B2 (ja) 2003-03-25 2009-04-30 シャープ株式会社 無線データ伝送システム及び無線データ送受信装置
US7242727B2 (en) 2003-03-31 2007-07-10 Lucent Technologies Inc. Method of determining transmit power for transmit eigenbeams in a multiple-input multiple-output communications system
US7403503B2 (en) 2003-07-09 2008-07-22 Interdigital Technology Corporation Resource allocation in wireless communication systems
DE602004013592D1 (de) 2003-07-11 2008-06-19 Qualcomm Inc Dynamischer gemeinsam benutzter vorwärtsstreckenka
CN100429311C (zh) 2003-08-08 2008-10-29 四川禾本生物工程有限公司 高抗草苷膦的epsp合成酶及其编码序列
US7065144B2 (en) 2003-08-27 2006-06-20 Qualcomm Incorporated Frequency-independent spatial processing for wideband MISO and MIMO systems
WO2005022833A2 (en) 2003-08-27 2005-03-10 Wavion Ltd. Wlan capacity enhancement using sdm
US7356089B2 (en) 2003-09-05 2008-04-08 Nortel Networks Limited Phase offset spatial multiplexing
KR100995031B1 (ko) 2003-10-01 2010-11-19 엘지전자 주식회사 다중입력 다중출력 시스템에 적용되는 신호 전송 제어 방법
US8233462B2 (en) 2003-10-15 2012-07-31 Qualcomm Incorporated High speed media access control and direct link protocol
US8483105B2 (en) 2003-10-15 2013-07-09 Qualcomm Incorporated High speed media access control
US8842657B2 (en) 2003-10-15 2014-09-23 Qualcomm Incorporated High speed media access control with legacy system interoperability
US7508748B2 (en) 2003-10-24 2009-03-24 Qualcomm Incorporated Rate selection for a multi-carrier MIMO system
JP2007509586A (ja) 2003-10-24 2007-04-12 クゥアルコム・インコーポレイテッド マルチ−キャリア通信システムにおける複数データストリームの周波数分割多重方式
US7616698B2 (en) 2003-11-04 2009-11-10 Atheros Communications, Inc. Multiple-input multiple output system and method
US7298805B2 (en) 2003-11-21 2007-11-20 Qualcomm Incorporated Multi-antenna transmission for spatial division multiple access
US9473269B2 (en) 2003-12-01 2016-10-18 Qualcomm Incorporated Method and apparatus for providing an efficient control channel structure in a wireless communication system
US7231184B2 (en) 2003-12-05 2007-06-12 Texas Instruments Incorporated Low overhead transmit channel estimation
EP1698086A2 (en) 2003-12-27 2006-09-06 Electronics and Telecommunications Research Institute A mimo-ofdm system using eigenbeamforming method
US7333556B2 (en) 2004-01-12 2008-02-19 Intel Corporation System and method for selecting data rates to provide uniform bit loading of subcarriers of a multicarrier communication channel
JP2005223829A (ja) 2004-02-09 2005-08-18 Nec Electronics Corp 分数分周回路及びこれを用いたデータ伝送装置
US7206354B2 (en) 2004-02-19 2007-04-17 Qualcomm Incorporated Calibration of downlink and uplink channel responses in a wireless MIMO communication system
US7746886B2 (en) 2004-02-19 2010-06-29 Broadcom Corporation Asymmetrical MIMO wireless communications
US7274734B2 (en) 2004-02-20 2007-09-25 Aktino, Inc. Iterative waterfiling with explicit bandwidth constraints
US7486740B2 (en) 2004-04-02 2009-02-03 Qualcomm Incorporated Calibration of transmit and receive chains in a MIMO communication system
US7848442B2 (en) 2004-04-02 2010-12-07 Lg Electronics Inc. Signal processing apparatus and method in multi-input/multi-output communications systems
US7110463B2 (en) 2004-06-30 2006-09-19 Qualcomm, Incorporated Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system
US7606319B2 (en) 2004-07-15 2009-10-20 Nokia Corporation Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels
US20060018247A1 (en) 2004-07-22 2006-01-26 Bas Driesen Method and apparatus for space interleaved communication in a multiple antenna communication system
US7599443B2 (en) 2004-09-13 2009-10-06 Nokia Corporation Method and apparatus to balance maximum information rate with quality of service in a MIMO system
KR100905605B1 (ko) 2004-09-24 2009-07-02 삼성전자주식회사 직교주파수분할다중화 다중입출력 통신 시스템의 전송 방법
TWI296753B (en) 2004-10-26 2008-05-11 Via Tech Inc Usb control circuit for saving power and the method thereof
EP2375584B1 (en) 2004-11-16 2024-03-13 Qualcomm Incorporated Closed-loop rate control for a mimo communication system
US8498215B2 (en) 2004-11-16 2013-07-30 Qualcomm Incorporated Open-loop rate control for a TDD communication system
US7525988B2 (en) 2005-01-17 2009-04-28 Broadcom Corporation Method and system for rate selection algorithm to maximize throughput in closed loop multiple input multiple output (MIMO) wireless local area network (WLAN) system
US7466749B2 (en) 2005-05-12 2008-12-16 Qualcomm Incorporated Rate selection with margin sharing
US7603141B2 (en) 2005-06-02 2009-10-13 Qualcomm, Inc. Multi-antenna station with distributed antennas
US8358714B2 (en) 2005-06-16 2013-01-22 Qualcomm Incorporated Coding and modulation for multiple data streams in a communication system
US20090291642A1 (en) 2008-05-23 2009-11-26 Telefonaktiebolaget Lm Ericsson (Publ) Systems and Methods for SIR Estimation for Power Control
US8619620B2 (en) 2008-09-16 2013-12-31 Qualcomm Incorporated Methods and systems for transmission mode selection in a multi channel communication system
US20100260060A1 (en) 2009-04-08 2010-10-14 Qualcomm Incorporated Integrated calibration protocol for wireless lans

Also Published As

Publication number Publication date
KR20120031091A (ko) 2012-03-29
EP2150005A2 (en) 2010-02-03
EP1557003A2 (en) 2005-07-27
US8169944B2 (en) 2012-05-01
KR101236306B1 (ko) 2013-02-22
TW200419969A (en) 2004-10-01
EP2337292A3 (en) 2011-08-17
AU2009233866A1 (en) 2009-11-26
IL204412A (en) 2012-10-31
CA2501398A1 (en) 2004-05-06
CA2501398C (en) 2015-10-27
JP2006504338A (ja) 2006-02-02
IL167570A (en) 2010-11-30
US20040156328A1 (en) 2004-08-12
KR101149096B1 (ko) 2012-09-20
JP4509793B2 (ja) 2010-07-21
EP1557003B1 (en) 2013-05-01
AU2003287294B2 (en) 2009-08-06
EP2337292A2 (en) 2011-06-22
ES2383937T3 (es) 2012-06-27
US8711763B2 (en) 2014-04-29
KR20050070085A (ko) 2005-07-05
ES2417354T3 (es) 2013-08-07
CN101883438B (zh) 2013-06-05
ATE556512T1 (de) 2012-05-15
WO2004038951A3 (en) 2004-06-10
MXPA05004396A (es) 2005-07-26
HK1121899A1 (en) 2009-04-30
WO2004038951A2 (en) 2004-05-06
CA2810036A1 (en) 2004-05-06
AU2009233866B2 (en) 2012-05-17
HK1150709A1 (en) 2012-01-06
CA2810036C (en) 2014-09-02
US20120140664A1 (en) 2012-06-07
AU2003287294A1 (en) 2004-05-13
TWI343724B (en) 2011-06-11
EP2150005B1 (en) 2012-05-02
BR0315561A (pt) 2005-08-30
EP2150005A3 (en) 2010-10-13
AU2003287294C1 (en) 2010-01-21
EP2337292B1 (en) 2013-05-08

Similar Documents

Publication Publication Date Title
CN101883438B (zh) 无线多址通信系统的随机接入
CN101232726B (zh) 无线多址通信系统的随机接入
US10165591B2 (en) Multi-user multiple input multiple output wireless communications
RU2417560C2 (ru) Произвольный доступ для беспроводных коммуникационных систем с множественным доступом
CN1906892B (zh) 在无线通信系统中提供高效控制信道结构的方法和装置
JP3471813B2 (ja) 移動体通信システムにおけるランダムアクセス
JP2003524986A (ja) リバースリンク初期パワー設定
US7715864B2 (en) Arrangement and method for contention-based multi-access in a wireless communication system
CN101248697B (zh) 无线电装置
AU2011253751B2 (en) Random access for wireless multiple-access communication systems

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
REG Reference to a national code

Ref country code: HK

Ref legal event code: DE

Ref document number: 1150709

Country of ref document: HK

C14 Grant of patent or utility model
GR01 Patent grant
REG Reference to a national code

Ref country code: HK

Ref legal event code: GR

Ref document number: 1150709

Country of ref document: HK

CX01 Expiry of patent term

Granted publication date: 20130605

CX01 Expiry of patent term