CN1068692A - 建立一条通信链路的方法和设备 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
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- 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
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- 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
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
- H04W52/0245—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal according to signal strength
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- 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
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
一种方法和装置,借此一个通信单元(10)以一第
一功率电平发送一个第一通信通道请求信号。如果
在预定一段时间内,与一个基站(12)的一条通信链路
未能建立,则通信单元以一第二功率电平发送第二通
信通道请求信号。此过程可继续到预定数目的次数
之后或直到一条通信链路被建立为止。于是,最近一
个基站,而不是更远处的基站,允准建立通信通道的
概率大大提高了。
Description
本发明总的说来涉及通信系统,具体地说,涉及无线电话通信系统。
无线电话通信系统(例如第二代无绳电话,或数字欧洲无绳电话)包括多个基站(亦称之为远端)及多个无线电话机(亦称之为手持机)。以第二代无绳电话(CT2)为例。CT2无线电话的用户通过基站与其它无线电话机工用户进行通信。
在那些有众多的人们要进行通话的区域(例如城市商业区域),需要有大量数目的基站以消除未被基站网络覆盖的空白区。然而,这些基站并不相互同步。当一个无线电话用户要想通话时,他或她要让无线电话单元去传送一个通道请求信号。因为每个基站都在独立地监视该CT2系统的通道,所以允准通道请求的那个基站并非正好是那个最靠近发送信道请求信号的无线电话单元的基站。这就可能是一个问题,因为该用户可能离开该基站的覆盖区,于是会将该通信键路丢失。另一方面,如果最近处的基站允准通道请求,则无线电话用户能在一个更大区域内移动过程中继续进行通信。于是便需要一用来获取一个通信通道且无上述问题的方法和装置。
简要地说,本发明提供了这样一方法和装置:一个通信单元以一第一功率电平发送一个第一通信通道请求,如果它与一个基站的通信链路在一个预定的周期未能建立起来,则该通信单元以比第一通信通道请求信号高的第二功率电平再发送一个第二通信通道请求信号。此过程可以继续一些预定的次数或继续到建立一个通信链路时为止。于是一被由附近的基站而不是由较远处的基站,允准此通信通道的概率大大地提高了。
图1是本发明的一个通信系统的简化方框图。
图2是本发明的一个基站的简化方框图。
图3是本发明的信道获取方法的流程图。
图4是本发明的另一信道获取方法的流程图。
参阅图1的本发明的通信系统的简化方框图。一个通信单元10(最好为一个无线电话手持机)在一个CT2通信系统中工作,该系统至少包括第一和第二基站12和14。该系统也可以包括几个其它的基站,通信单元及一个公共交换电话网(PSIN)16。与第二基站14相比,该通信单元10更靠近于第一基站12。当通信单元10的用户想要通话时,他或她让通信单元10发送一个第一通道请求信号(它包括该单元的标识号)请求一条通信通道。该第一通道请求信号具有一个为通信单元10的最大输出功率的预定分数的功率电平。此最大发送功率的分数是根据离批准该通信通道(建立所寻找的通信链路)的基站最佳的最小距离予以选定的。此离基站的最佳最小距离用区域18表示。在本例中,只有基站12是在区域18内,于是只有基站12接收此第一通道请求信号。因而,基站12(而不是基站14)允准通信单元10建立通信通道,从而解决了可能由较远距离的基站14允准通信通道的问题。一旦通信通道被建立,通信单元10再以其最大传输功率进行工作。
现参阅图2的本发明的无线电话机20。电话机20包括一个接收机22,一个被接收信号强度指示器(RSSI)32,一个控制器24(如传统的微处理器),一个发射机部分26,及一个射频功率放大器28和一个用来调节射频功率放大器28的增益或输出电平的功率电平控制电路30(如带可调电阻的反馈电路)。RSSI指示器32用来确定被接收信号(如从基站接收的)的强度电平。一个常规的麦克风40和音频放大器42接收语言信号并向发射机26提供代表该语音的音频信号。一个通道请求开关38与控制器24相连,从而使得在开关38启动时开始发送此开关38可以通过例如打开电话机的握键(flap)来机械地启动。
参阅图3,此处示出了本发明的用于CT2通信系统中的通道获取方法的流程图。在步100,一个无线电话机(即话机10)半其输出功率电平设定在功率电平1。功率电平1最好很低,(如0.16毫瓦,或为标称输出功率的-18dB)以求与最近的基站建立一条通信链路。在步102,话机10通过以此第一功率电平发送一个第一通信通道请求来搜寻一个基站。在判决框104中判定一条通信链路是否已允准。如果通信链路已允准,则由判决框106对发送功率是否为标称工作电平作出判断。如果发送功率不是在标称电平,则在步108步将其增加到标称电平。然后,在步110,根据在公共空间接口MPT1375文件即Document of common Air Interface MPT1375(Department of Trade and Industry)所规定的协议继续工作。
如果在判决框104中判断到:通信链路还未允准。则下一个判决框112对现功率电平是否为标称值作出判断。如果现功率是标称值,则在步114向用户指示“无链路”(“no link”)。如果该功率电平不是标称值,则在步110时,增加发送功率,并返回步102。
在建立一条通信链路可以进行预定数目的若干次试探,每次试探使用一个递增的发送功率电平。例如,第二次试探可以为0.63毫瓦ERP(标称值的-12dB),第三次试探可以为2.50毫瓦ERP(标称值的-6dB),和第四次为10.00毫瓦ERP(CAI的标称值)。本方法的优点在于:按照CT2协定,话机在750毫秒之后不会切换通道。
现参阅图4,它示出了本发明的另一个通道获取方法的流程图。在有些情况下,根据一个通道请求信号所允准的第一通道并不是最佳的基站与请求链路的话机之间所建立通信链路。例如,当话机发送通道请求时,可能正好因一临时障碍物将那最佳基站与话机相遮档。此时,可能要求不接受此允许的第一通道。在步200时,无线电话机将其发送功率设定在电平1。在步202时,无线电话机以电平1(它是可提供的最在或标称发送功率的一个分数)发送一个第一通道请求信号。在判决框204时,无线电话机确定是否从基站接收了通道允准信号。此通道允许信号也可能是其它用以确定由一个特定基站所发送的信号的被接收的信号强度(RSS)的信号。
如果通道允准信号已被接收,则在步206,话机测量并存储此被接收的通道允准信号的接收信号的强度电平(RSS电平)。然后,在步208,将发送功率设定在高于电平1的电平2上并发送第二通道允准信号。
在步212,进行第二判决已确定是否已根据第二通道请求信号接收了任何通道允准信号。如果已接收到一个允准信号,则话机测量并存储(步214)一个或多个所接收的通道允许信号。然后,在步216,话机每个接收到的通道允准信号的RSS电平与已被接收(并已存储)的任何其它通道允许信号的诸电平作一比较。
在判定框218话机确定一个基站是否能依据RSS和发送功率电平被选定,有些状况可能会是模糊的,从而产生“NO”(否)的回答。例如,如果第二通道允准信号的RSS电平比第一通道允准信号的RSS电平高,则无明确的最佳基站,于是需要做第三次比较。这样,如果在判决框218中的回答是“NO”,则在步224发送功率被增加到第三电平3。然后,在步224发送一个第三通道请求。
然后,第三判决框226确定是否任何通道允准信号已根据该第三通道请求信号被接收到。如果没有收到,则功率电平可被增加n次,并在步230将过程继续下去或在此点中断。如果已响应该第三通道请求已接收到一个或数个通道允准,则过程进到步214。在此点,在步218时应有充足的信息对最佳基站作出判断。
如果第一和第二通道请求信号并不致于接到一个通道允准信号,而响应于第三通道信号接到了一个通道允准信号,那末此第三通道允准信号是可接受的,由此建立一个链路。
在步220,话机确定并挑选具有最低发送功率电平而有最高RSS的基站,并据此建立一条通信链路。
本发明的此种选择一个基站的方法大大地增加了由最近的基站允准通信链路的概率。
Claims (9)
1、在一个具有多个基站的通信系统中,各基站能够响应于一个自来通信单元的通道请求信号分配给该通信单元使用一个通信通道,一种在上述系统中有助于使通信单元使用一个特定基站的方法,其特征在于通信单元包括如下步骤:
发送一系列通道请求信号直到接到一个通道允准或发完了一个预定数目的通道请求信号时为止,依次发送的每个上述一系列通道信号的功率电平依次比其前一个大。
2、在一个具有多个基站的通信系统中,各基站能够响应于一个来自通信单元的通道请求信号分配给该通信单元使用一个通信通道,一种有助于通信单元使用一个特定基站的方法,包括如下步骤:
(a)以第一功率电平发送一个第一通道请求信号;
(b)如果未收到一个通信通道允准信号,则在一段时间之后发射一个第二通道请求信号,该第二通道请求信号具有比第一通道请求信号高的功率电平。
3、根据权利要求2的方法,通信单元还包括如下步骤:
(c)接收一个通道允准信号;
(d)以一个正常通信模式工作,同时各信号以一预定功率电平发送。
4、根据权利要求2的方法,其中所述预定功率电平是第二通道请求信号的功率电平。
5、根据权利要求的方法,通信单元还包括如下步骤:
(c)发送一系列通道请求信号,直到收到一个通道允准或直到在发完了一预定数目的通道请求信号每个依次发送的通道请求信号功率电平比前一个的大。
6、根据权利要求5的方法,通信单元还包括如下步骤:
(e)接收一个通道允准;
(f)以正常通信模式工作,同时诸信号以预定功率电平发送。
7、在一个具有多个基站的通信系统中,各基站能够响应于一个来自通信单元的通道请求信号,分配给该通信单元使用一个通信通道,一种在上述系统中有助于使通信单元使用一个特定基站的方法,其特征在于通信单元包括如下步骤:
(a)给该通信单元设定一个第一发送功率电平;
(b)发送第一通道请求信号;
(c)确定是否收到一个通道允准信号;
(d)确定此第一发送功率是否等于一个预定电平;及
(e)当一个通道允准信号未被接收到而第一发送功率不等于预定电平时,设定一个第二发送功率电平,此第二发送功率电平是比第一发送功率电平大。
8、一个通信单元,包括
发送装置;
用来发送具有一可变功率电平的通道请求信号的装置;
用于接收通道允准信号的装置增加可变功率电平的装置。
9、在一个具有多个能够根据来自通信单元的通道请求信号而向该通信单元分配其使用一条通信通道的基站的通信系统中,一种有助于使用一个特定基站的方法,通信单元包括如下步骤:
(a)以第一功率电平发送一个第一通道请求信号;
(b)接收来自一个基站的第一通道允准信号;
(c)测量并存储该第一通道允准信号的第一信号强度电平;
(d)以一个比第一功率电平高的第二功率电平发送一个第二通道请求信号;
(e)接收一个第二通道允准信号;
(f)测量并存储第二通道允准信号的接收到的信号强度电平;
(g)对第一通道允准信号的接收到的信号强度电平与第二通道允准信号的接收到的信号强度电平作一比较,由此确定那个通道允准信号具有较大的被接收信号强度;及
(h)根据所存储的信号强度电平及其相应的功率电平选择一个基站。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US72054591A | 1991-06-25 | 1991-06-25 | |
US720,545 | 1991-06-25 |
Publications (2)
Publication Number | Publication Date |
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CN1068692A true CN1068692A (zh) | 1993-02-03 |
CN1027611C CN1027611C (zh) | 1995-02-08 |
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CN92105006A Expired - Fee Related CN1027611C (zh) | 1991-06-25 | 1992-06-24 | 建立一条通信链路的方法和设备 |
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US (1) | US5345596A (zh) |
EP (1) | EP0591356A1 (zh) |
KR (1) | KR960006140B1 (zh) |
CN (1) | CN1027611C (zh) |
AU (1) | AU659349B2 (zh) |
BR (1) | BR9206187A (zh) |
CA (1) | CA2102502A1 (zh) |
FI (1) | FI935810A (zh) |
MX (1) | MX9203111A (zh) |
NO (1) | NO934735L (zh) |
WO (1) | WO1993000750A1 (zh) |
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-
1992
- 1992-06-05 EP EP92913694A patent/EP0591356A1/en not_active Withdrawn
- 1992-06-05 BR BR9206187A patent/BR9206187A/pt not_active Application Discontinuation
- 1992-06-05 WO PCT/US1992/004720 patent/WO1993000750A1/en not_active Application Discontinuation
- 1992-06-05 CA CA002102502A patent/CA2102502A1/en not_active Abandoned
- 1992-06-05 KR KR1019930703847A patent/KR960006140B1/ko active IP Right Grant
- 1992-06-22 MX MX9203111A patent/MX9203111A/es not_active IP Right Cessation
- 1992-06-24 CN CN92105006A patent/CN1027611C/zh not_active Expired - Fee Related
-
1993
- 1993-05-26 US US08/068,274 patent/US5345596A/en not_active Expired - Fee Related
- 1993-11-01 AU AU50389/93A patent/AU659349B2/en not_active Ceased
- 1993-12-21 NO NO934735A patent/NO934735L/no unknown
- 1993-12-23 FI FI935810A patent/FI935810A/fi not_active Application Discontinuation
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US8391839B2 (en) | 2000-05-05 | 2013-03-05 | Nokia Corporation | Communication devices and method of communication |
Also Published As
Publication number | Publication date |
---|---|
CN1027611C (zh) | 1995-02-08 |
CA2102502A1 (en) | 1992-12-26 |
KR960006140B1 (ko) | 1996-05-09 |
NO934735D0 (no) | 1993-12-21 |
MX9203111A (es) | 1992-12-01 |
FI935810A0 (fi) | 1993-12-23 |
EP0591356A4 (en) | 1994-03-18 |
KR940701604A (ko) | 1994-05-28 |
WO1993000750A1 (en) | 1993-01-07 |
AU5038993A (en) | 1994-09-22 |
US5345596A (en) | 1994-09-06 |
FI935810A (fi) | 1993-12-23 |
EP0591356A1 (en) | 1994-04-13 |
AU659349B2 (en) | 1995-05-11 |
BR9206187A (pt) | 1994-11-14 |
NO934735L (no) | 1993-12-21 |
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