CN1600041A - 通信系统中点对多点服务的信道管理的方法和装置 - Google Patents
通信系统中点对多点服务的信道管理的方法和装置 Download PDFInfo
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Abstract
为了在现有的蜂窝通信系统基础设施中同时启用点对多点以及点对点通信服务,本发明揭示了一种用于蜂窝通信系统基础设施中与分配用于点对多点服务的使用相关的信道管理和杂项开销的装置和系统。
Description
本申请要求2001年3月28日提交的待审临时申请No.60/279970题为“METHOD AND APPARATUS FOR GROUOP CALLS USING DEDICATED AND COMMONCHANNELS IN WIRENESS NETWORKS”的优先权。
发明领域
本发明涉及有线或无线通信系统点对多点服务。具体而言,本发明涉及通信系统中这种点对多点服务的信道管理的方法和装置。
背景技术
通信系统已经发展到使信息信号从始发站到物理上各目的站的传播。在通过通信信道从始发站发送信息信号中,信息信号首先被转换成适合于在通信信道上有效传输的形式。信息信号的转换或调制涉及到按照信息信号以限制最后经调制的载波频谱在通信信道带宽之内的方式来改变载波的参数。在目的站,从通过通信信道接收到的调制载波复现原始的信号。这种复现通常是通过使用始发站采用的调制的逆过程来达到的。
调制还有助于几个信号在公共通信信道上的多址即同时发送和/或接收。多址通信系统经常包括多个远端用户终端,它们要求相对短期间的间断服务而不是连续接入公共通信信道。已知有几种多址技术如时分多址(TDMA)、频分多址(FDMA)以及调制多址(AM)。另一类多址技术是码分多址(CDMA)扩谱系统,它符合“双模式宽带扩散蜂窝式系统的TIA/EIA(IS-95移动站-基站兼容性标准”(以下称为IS-95标准)。多址通信系统中CDMA技术的应用在以下的专利中有揭示:美国专利4,901,307,题为“SPREAD SPECTRUMMULTIPLE-ACCESS COMMUNICATION SYSTEM USING SATELLITE OR TERRESTRIALREDEATERS”,和美国专利5,103,459,题为“SYSTEM AND METHOD FOR GENERATINGWAVEFORMS IN A CDMA CELLULAR TELEPHONE SYSTEM”,两者都已转让给本发明的受让人。
多址通信系统可以是无线或有线的且可以载送语音和/或数据。载语音和数据的通信系统的例子是按照IS-95标准的在通信信道上规定发送语音和数据的系统。在美国专利5,504,773、题为“METHOD AND APPARATUS FOR THEFORMATTING OF DATA FOR TRANSMISSION”(转让给本发明的受认人)中详述了以固定大小的码信道帧发送数据的一种方法。按照IS-95标准,数据或语音被分成码信道帧,20ms宽、数据速率高达14.4Kbps。载送语音和数据的另外的例子包括符合“第3代协作项目”(3GPP)的通信系统,收纳在一组文件中:文件Nos。3G TS 252111、3G TS25212、3G TS25213以及3G TS 25214(W-CDMA标准),或“cdma 2000扩谱系统的TR-45.5物理层标准”(IS-2000标准)。
多址通信系统中,用户间的通信通过一个或多个基站进行。一个用户站的第1用户向第2用户站的第2用户通信通过在反向链路上向基站发送数据进行。基站接收该数据并将该数据路由至另一基站。该数据在该同一基站或另一基站的正向链路上发送至第2用户站。同样可在移动用户站上的第1用户与陆上通信站上的第2用户站之间进行通信。基站接收来自反向链路上用户的数据并将该数据公共交换电话网(PSTN)路由至第2用户。
上述的无线通信服务是点对点通信服务的例子。与之相对,点对多点服务是一种将信息源提供的信息分配给多个用户的服务。点对多点的基本模型包括一组用户站上的用户,它们通过有线或无线网络从一或多个信息源接收信息。点对多点服务中,源固定地决定信息内容如新闻、电影、运动事项等,用户一般不作返回通信。为节约资源,一般参照点对多点服务的每个用户站(成员用户站)监视由信息调制的共享信道。这种点到每点服务也称作广播或多路广播,其一般应用的例子包括TV广播、无线电广播等。另一方面,信息源是用户、组的成员,它们发送打算给其余组员的信息。如用户想说话,则他按下说话钮(PTT)。通常,用户的语音从用户站路由至专用反向链路信道上的网络。然后在正向链路公共信道上网络发送该说话者的语音。如同点对点通信系统情况一样,这种通信系统使陆线和无线用户站接入该系统。这种点对多点服务也称为组服务。组服务通信应用的例子是调度服务,如本地警察无线电系统、出租车调度系统、联邦情报局与秘密服务工作、以及一般军事通信系统。
上述的点对多点服务通信系统通常是高度专用通信系统。随着近来无线蜂窝式电话系统的进展,人们有兴趣利用现有的基础结构——主要是点对点蜂窝式系统——用作点对多点服务。如这里所用,术语“蜂窝式”系统包含既工作于蜂窝式又工作于个人通信系统(PCS)频率的系统。
如所讨论,为节约资源,通常点对多点服务依靠提定由所有成员用户待监视的共用正向链路信道。与之相对,无线蜂窝电话系统分配在基站或其覆盖区包含想要通信的用户的扇区之间的专用正反向链路信道。由于能得到无线蜂窝式电话系统支持的这种专用的正反向链路信道数有限,因此能加入通过专用的正反向链路信道提供的点对多点服务的成员数有限。此外还要求在无线蜂窝式电话系统中使既能组服务又能电话服务。因此在技术上要求利用无线蜂窝式电话系统的基础结构能提供分组服务和电话服务的这种信道管理的方法和装置。
发明内容
在本发明的一个方面,由通信系统中的信道管理来说明上述要求,包括在主动期间内对属于一个组的每个用户站分配共享的正向信道;并在寂静时间对属于一个组的每个用户站分配正向信道。
在本发明的另一个方面,由通信系统中的信道管理来说明上述要求,包括当主动期间对属于一个组的每个用户站分配专用反向信道;由属于该组的主动用户站用户数据和控制数据调制该专用反向信道;以及由属于该组的被动用户站用控制数据调制该专用反向信道。
在本发明的又一个方面,由属于一个组的用户站以发送请求调制反向链路信道来说明上述要求;以及通过用户站监视的正向链路信道接收发送请求的响应。所有的反向链路信道和用户站监视的正向链路信道取决于点对多点服务活动(如静止)和主动周期。响应可包括反向链路信道分配和明确的发送许可。
在本发明的又一个方面,根据点对多点服务活动(如静止)和主动期间通过分配由成员移动站要监视的不同正向链路和要用的反向链路来说明上述的要求。
附图说明
图1为说明点对多点服务通信系统的概念图。
具体实施方法
词语“示例性”在这里专指“用作例子、示例或说明”。虽然这里包含最佳模式的实施例,但描述为“示例性”的实施例未必解释为优于其他实施例。
术语“点对点通信”在这里指两个用户站之间通过专用正向通信信道和专用反向通信道的通信。
术语“点对多点通信服务”在这里指多个用户站正在从(一般为)一个信源接收通信的通信。这种服务可以包括如:分组服务,其中信源是用户站;广播服务,其中信源是中央站;或多路广播服务,其中接收者包括一个子组的多个用户站。
术语“接入网络”在这里指一批基站和一个或多个基站的控制器。接入网络在多个用户站之间传送数据。接入网络还可连接到在接入网络之外的附加网络如公共内部网或联网,可在每个接入终端与此外部网之间传送数据。
术语“基站”在这里指借此用户站进行通信的硬件。“小区”是指硬件或地理覆盖区,取决于该术语所用处的上下文。“扇区”是小区的一部分。由于扇区具有小区的属性,因此用基站/小区描述的原理可以扩展到扇区。
术语“用户站”在这里指借此接入网络进行通信的硬件。用户站可以是移动的或固定的。用户站可以是任何通过无线信道或有线信道如应用光纤或同轴电缆进行通信的数据设备,用户站还可以是几种设备中的任一种,这些设备包括但不限于PC卡、小型闪速存储器、外部或内部调制解调器、或者无线或有线电话。在与基站建立有效业务连接的过程中的用户站被称为连接状态。
术语“物理信道”在这里指用调制特性和编码所描述的信号在其上传播的通信路由。
术语“逻辑信道”在这里指在基站或用户站的协议层中的通信路由。
术语“通信信道/链路”在这里指按照上下文的物理信道或逻辑信道。
术语“反向信道/链路”在这里指用户站通过其发送信号到基站的通信信道/链路。
术语“正向信道/链路”在这里指基站通过其发送信号到用户站的通信信道/链路。
术语“软越区切换”在这里指在用户站和两个或多个扇区之间的通信,其中每个扇区属于不同小区。反向链路通信由两个扇区接收,正向链路通信同时携带在两个或多个扇区的正向链路上。
术语“更软越区切换”在这里指在用户站和两或多个扇区之间的通信,其中每个扇区属于不同小区。反向链路通信由两个扇区接收,正向链路通信同时携带在两个或多个扇区之一的正向链路上。
术语“收缩”在这里指用第1种规模的第2信息内容代替第1种规模的第1信息内容。
术语“专用信道”在这里指用分配个别用户站的信息调制的信道。
术语“公共信道”在这里指用在所有用户站中共用的信息调制的信道。
术语“用户数据”或“有效负载”在这里指控制数据以外的数据。
术语“控制数据”在这里指使通信系统中实体的运转的数据。控制数据包括如呼叫保持信令、诊断以及报告信息,等。
图1示出按照本发明能提供点对点服务的通信系统100的概图。为清楚起见,下面的说明表明分组服务,然而本专业的技术人员明白如何将所揭示的概念应用于点对多点服务。(呼叫)组由小组的成员来确定,包括互相经常谈话足以建立呼叫组的用户组的用户。当没有成员或空闲或主动,即所有成员或不参加呼叫组成关闭其用户站时,据认为该呼叫组处于睡眠状态。当至少一个成员参加该组时,该呼叫组为空闲状态。当至少2个成员之一开始组呼叫,该呼叫组为主动状态。组呼叫分为主动的和静止的期间。当成员之间有传播而没有长的空闲期间时,该组呼叫为主动期间。当一个第的空闲期间中没有成员发送任何业务时,该组呼叫为寂静时间。
在主动期间,用户站如用户小102(1)的组用户通过包括基站104和控制器110的接入网络将用户信息(语音或数据)通知用户站102(2)至102(5)上的其他小组用户。为简时计,术语“成员用户站”在这里指“用户站上的小组用户”,除非另有说明。基站104通过回程112连接到控制器110。术语“回程”在这里指控制器与基站间的通信链路。回程112可以多种连接型式来实施,包括如微波或有线E1或T1,光纤,以及如业内人士所知的其他连接型式。控制器110连接接口单元114,后者将通信系统100连接其他服务(未图示)如公共交换电话网(PSTN),分组数据服务节点(PDSN)以及业内一般人士所知的其他服务。
当成员用户组如用户组102(1)要通过反向链路将用户数据发送到该组时,成员用户组需要请求反向链路的分配及发送许可。位于单个扇区、包含扇区的基站、控制器或包含接入网络的任何其他单元的控制单元负责信道分配。然后通过由用户站监视的正向链路信道将分配提供给成员用户站。反向链路被分成诸反向链路信道。一旦分配成员用户站102(1)某一反向链路信道108(1),用户站102(1)就可发送信息至基站104(1)。这样的发送成员用户站称为主动成员或说话者。基站104(1)将接收的信息路由至基站104(2)和104(3),并在正向链路共享信道106(1)上发送所接收信息至用户站102(2)。基站104(2)和10493)在正向链路公共信道106(2)和106(3)上发送该路由的信息。为接收来自该主动的成员用户站102(1)的信息,在主动组呼叫时分配主动组即用户组102(1)至102(5)的所有成员用户站监视其单个基站104的正向链路公共信道106。一般说,各基站104(1)、104(2)和104(3)所分配的正向链路共享信道106(1)、106(2)和106(3)互不相同。然而为改进位于重叠覆盖区的成员用户站102的接收,可由一个以上的扇区或基站104同步地发送正向链路共享信道106。关于重叠覆盖区中正向链路公共共享信道的改进接收的方法在待审申请专利No.09/333,607题为“METHOD AND SYSTEM A HANDORR IN A BROADCASTCOMMUNICATION SYSTEM”(2001年8月20提交)中有揭示(转让给本发明的受让人)。业内人士认识到服务一个区域的基站可划分扇区。因而,术语扇区和基站可互换使用,除非有专门说明。
在一个实施例中,正向链路共享信道106由打算给成员用户站的用户信息和控制信息所控制,控制信息如信令信息、功率控制信息和业内人士所知的通信系统整体操作所必须的其他型式信息。然而,有限的正向链路共享信道的容量阻止了呼叫信息与呼叫维持信息两者的调制。因而在另一实施例中,在正向链路共享信道106上只发送用户信息,控制信息可调制在附加的正向链路信道(后而称为控制/信令正向链路信道)上。这里,每个成员用户组102除监视正向链路共享信道外,必须监视控制/信令正向链路信道。这种控制/信令信道可以是专用信道或共享信道。
当主动期间结束,即,成员用户站102(1)结束通信且没有其他成员用户站102开始第1决定时间段的通信时,寂静期开始。为减小能力的浪费,成员用户站102停止监视正向链路共享信道106,以及控制/信令正向链路(如果有的话),并开始监视决定的正向链路信道,因此转移到待用状态。在一个实施例中,正向链路共享信道106的发送可以停止。术语待用状态在这里指从此成员用户站102按照预定程序转到正向链路公共信道监视的状态。这种预定程序可作为状态机来实现。在没有组通信活动的第2决定时间段之后,成员用户站102从待用状态转到空闲状态。在空闲状态,成员用户站102监视决定的正向链路信道,但是向正向链路共享信道监视的转移是按照预定的程序执行的,它不同地从待用状态转移到正向链路信道监视的预定程序。此外,如果成员用户站102知道组呼叫被结束,该成员用户站102可直接转移到空闲状态。在另一实施例中,由控制体通过基站104指令成员用户102转到适当的状态。
当寂静期结束、主动期开始,成员用户站102从待用或空闲状态转回正向链路共享信道106。成员用户站102由通过基站104在待用或空闲状态中被成员用户站102所监视的正向链路信道发送的信道消息告知有关主动期间开始的消息。
对通信系统的上述概念的请求以下按IS-2000标准详作解释。虽然下文用采用按IS-2000标准规定的通信系统的信道来说明。但业内的技术人员当能将上述概念引伸到按其他标准的通信系统的信道上。
正向链路信道分配
为使容量最大化和功耗最小化,同时允许多用户接收用户通信(语音或数据),当主动组呼叫时,即将允许成员用户站接收在正向链路共享信道上调制的数据的信息提供给成员用户站时,主动组的成员被分配其单个扇区的正向链路共享信道。在一个实施例中,按照IS-2000标准的通信系统中,正向链路共享信道包括正向补充信道(F-SCH),它由用户数据和控制数据两者所调制并由扇区的覆盖区中的成员用户站所共享。当成员用户站加入主动组,控制体就通过适当的扇区分配该成员用户站监视(解调)该共用的F-SCH一段有限的或无限的期间。通过在信道上发送一个分配消息,哪个用户站一面监视,一面在空闲或待用状态,由此来完成这种分配。为简单起见,共用的F-SCH可以工作在固定速率模式,或为更灵活起见可工作在变速率模式。术语可变模式在这里指在一致同意的一组数据速率内改变而不必通知。
一旦成员用户站正在监视F-SCH,就可在F-SCH上发送为维持呼叫所必需的控制数据如导频强度测量消息、越区切换方向消息、越区切换完成消息和业内人士所知的其他消息,以及与组呼叫有关的控制数据。与组呼叫有关的消息包括如组呼叫的开始与结束、发送权的请求与许可、以及其他为业内人士所知的消息。由于F-SCH是共享信道,故必须采用适当的成员用户站访问信息,使成员用户站能将针对所有成员用户站的共用信息与针对特定成员用户站的专用信息区别开来。该控制数据及成员用户站访问的开销不利地影响着F-SCH的用户数据负载能力。所以,或者将控制数据消息装载于控制/信令正向链路信道。
在一个实施例中,按照IS-2000标准在通信系统中对各单个成员用户站经过扇区分配来控制整体的控制/信令正向链路信道,包括正向专用控制信道(F-SCH)。除其他控制数据外,F-DCCH还可用控制成员用户站在反向链路信道上发送的发送功率电平的反向链路功率控制命令来调制。功率控制命令包括收缩进入F-DCCH的正向功率控制子信道(F-PCSCH)。术语“收缩”在这里指发送反向链路功率控制命令代替F-DCCH命令。当F-DCCH上没有信令负载,只发送F-DCSCH时,就消耗较少的功率和容量。在下述专利中揭示了点对多点服务通信系统中的其他功率控制方法:待审申请NO.××××××题为“POWERCONTROL FOR POINT-TO-MULTIPOINT SERVICES PROVIDED IN COMMUNICATIONSTSTEMS”,2002年3月28日申请,打算转让给本发明人受让人。
或者,按照IS-2000标准在通信系统中,对各单个成员用户站经扇区分配来控制实体的控制/信令正向链路信道,包括正向公用控制信道(F-CCCH)、正向广播信道(F-BCCH)、或F-CCCH和F-BCCH的组合。因此,成员用户站的信令消息被调制在F-CCCH/F-BCCH上。此外,控制成员用户站反向链路信道发送的发送功率电平的反向链路功率控制命令可被调制在正向公共功率控制信道(F-CPCCH)上。当F-CCCH/F-BCCH上无信令只是发送F-CPCCH时,就消耗较少的功率和容量。下一CPCCH的应用揭示在上述的专利中,即待审申请NO.×××××题为“POWER CONTROL FOR POINT-TO-MULTIPOINT SERVICES PROVIDEDIN COMMUNICATION SYSTEMS”,2002年3月28日提交,转让给本发明的受让人。
成员用户站可将有关服务质量(QoS)通知发送扇区。这样,在一个实施例中,当接收调制正向链路共享信道的公用信息有错时,成员用户站可通知发送扇区有关错误并重发该信息。在按照IS-2000的通信系统中,可对QoS报告使用反向加强访问信道(R-EACH)。在一个实施例中,重发发生在正向链路共享信道上。在另一实施例中,重发发生在分配给成员用户站的控制/信道正向链路信道,如F-DCCH、F-CCCH、F-BCCH。当重发引起的时延和延时变化对应用来说可以忍受时,这是方便的。有关重发的细节在下述专利中揭示:待审申请No.09/989,347,题为“SYSTEM AND METHOD FOR FRAME RE-TRANSMISSION IN ABROADCAST COMMUNICATION STSTEM”,2001年7月2日申请,已转让给本发明的受让人。
在另一实施例,正向链路共享信道包括:F-CCCH、F-BCCH或F-CCCH和F-BCCH的组合。成员用户可共用F-CCCh和F-BCCH作组呼叫,同时非成员用户站监视F-CCCH和F-BCCH作寻呼。为组呼叫的F-CCCH和F-BCCH可简单地以固定速率模式运作或灵活地可变速率模式运作。因F-CCCH和F-BCCH是公共信道,必须采用适当的用户站访问信息,以使用户站能将打算用于成员用户站的共用信息与专用于个别用户站的信息区分开来。
为避免寻址开销,在一个实施例中可以分开F-CCCH和F-BCCH使得扇区中一些F-CCCH和F-BCCH被分配为成员用户站的正向链路公共信道用于点对多点服务,其余的F-CCCH和F-BCCH被分配为非成员用户站的寻呼专用。
如所讨论,用户站访问的信道消息和开销不利地影响正向链路共享信道的业务容量,所以或者将信令消息载于控制/信道正向链路信道上。因此,当扇区或基站中的一些F-CCCH和F-BCCH被分配为点对多点服务的正向链路共享信道时,可以利用附加的F-CCCH和与其有关的正向快速寻呼信道(F-QPCH)用于寻呼,利用附加的F-BCCH用于点对多点服务信令。成员用户站继续监视分配给该组作为正向链路共享信道的F-CCCH和F-BCCH和信令F-BCCH。此外,分配每个成员用户站监视F-QPCH上的时隙以决定是否需要监视与F-QPCH有关的F-CCCH的应用在IS-2000中有充分的说明,为业内一般人士所知。
当主动成员用户站与基站通信时,一个实施例中,反向链路功率命令在正向链路共享信道即F-CCCH/F-BCCH上发送。另一实施例中,成员用户站和非成员用户站两者的反向链路功率命令调制到F-PCSCH上。为适当地解释反向链路功率命令,每单个用户站监视分配给用户站的F-PCSCH上功率控制命令的不同子流。或者扇区或基站中对成员用户站分配某些F-PCSCH,同时对非成员用户站分配F-CPCCH。又,分配每单个用户站监视分配的F-PCSCH上功率控制命令的不同子流。F-CPCCH的应用揭示在上述待审申请NO.×××××,题为“METHODAND APPARATUS FOR A POWER CONTROL IN A POINT-TO-MULTIPOINT SERVICES INA COMMUNICATION SYSTEM”,2002年3月28日提交,转让给本发明人的受让人。
成员用户站可将有关服务质量(QoS)通知发送扇区。这样,在一个实施例中当成员用户站接收调制正向链路共享信道F-CCCH或F-BCCH的公用信息有错时,成员用户站可用反向加强访问信道(R-EACH)通知发送扇区有关错误,并重发该信息。重发发生在组呼叫F-CCCH或F-BCCH上。当时间延迟和重发引起延迟变化在应用中可以承受时重发是方便的。重发的细节揭示在上述2001年7月2日申请的No.009/989,347中,题为“SYSTEM AND METHOD FOR FRAMERE-TRANSMISSION IN A BROADCAST COMMUNICATION SYSTEM”,已转让给本发明的受让人。
反向链路信道分配
如上所述,一般一次只有一个成员用户站在反向链路上进行发送。因此,虽然被动成员用户站不在任一扇区的反向链路上发送用户数据,但被动成员用户站需要使用反向链路通知为呼叫维持所需的扇区信息,如:越区切换消息、功率控制以及业内人士所知的其他信息。术语“被动”在这里指监视正向链路共享信道的成员用户站,及对分组呼叫需要的任何控制/信令正向链路信道但不在反向链路信道上发送用户数据。此外,被动成员用户站可以希望通知某些数据,因此被动成员用户站需要用来请求反向业务信道分配的设备。因此被动成员用户站可要求被分配的反向链路信道。
根据一个实施例,控制实体通过扇区对每单个成员用户站分配反向专用信道,它在按照IS-2000标准的通信系统中包括加入主动组的反向专用控制信道(R-DCCH)。被动成员用户站使用R-DCCH用于对规则的呼叫(如正向链路导频的报告)发送控制数据,并发送有关组呼叫的控制数据(如正向链路广播信道的质量测量报告、反向链路业务信道分配的请求)。主动成员用户站还使用R-DCCH用来发送用户数据。当发送R-DCCH时,成员用户站还发送反向导频信道(R-PICH)和反向功率控制子信道(R-PCSCH)。R-PCSCH载送关于正向链路共享信道的质量测量的反馈。
因为R-DCCH只用控制数据调制,故存在不需要发送这种信息的期间。因此被动成员用户站可停止发送R-DCCH,并只发送与R-PCSCH多路复用的R-PICH。这种操作模式说明于IS-2000标准。
如果不活动期间超过预定时段,可通过门控来进一步达到功率和容量消耗的减小。术语“门控”在这里指只在预定功率控制组(PCG)内激发R-PICH/R-PCSCH的发送。此外,如同在扇区功率测量的频率下降一样,因为对精密反向链路功率控制的要求变得较不重要,因此在运载反向控制功率命令的F-CPCCH上对应的子流的数据速率下降。通过对较低速率子流分配该门控的成员用户站或由多路门控成员用户站共用较高速率子流可达到F-CPCCH的速率下降。
此外,如不需要发送功率控制命令,则按照IS-2000标准,R-PCSCH的发送可以中止,他只需从用户站发送的是R-PICH,即R-PICM继续发送而无多路复用的R-PCSCH。此外,R-PICH/R-PCSCH的发送可完全停止。这导致在对应的F-CPCCH上停止子流。
而且可用两种方法的组合。这种方法中,成员用户站在第1无效时段后开始门控的R-PICH/R-PCSCH发送,并在第2无效的段后停止R-PICH/R-PCSCH发送。对应的F-CPCCH的数据速率被相应降低。
如果当R-DCCH上门控的或停止模式期间成员用户站要求发送控制数据信令消息,则第1信令消息的发送结束了门控,即,在信令消息期间,R-PICH、R-PCSCH和R-DCCH连续被激发。一旦信令消息已发送,用户站就回复到如上的门控的或停止的模式。而且,为帮助扇区获得用户站信号,能以提高的功率电平在R-DCCH消息之前激发R-PICH,作为前同步信号。
在另一实施例中,只分配主动用户站专用反向链路信道如R-DCCH。不分配被动用户站专用反向链路信道。而当需要时被动成员用户站对反向链路信令使用反向加强的访问信道R-EACH,使用基本访问、存储访问和功率控制访问。在IS-2000标准中定义了基本访问、存储访问和功率控制访问,为业内人士所熟知。
按照基本访问模式,成员用户站随机选择R-EACH并用增大的功率在R-PICH上发送报头,接着在R-EACH上发送消息。然后成员用户站监视正向链路共用信息以便确认,并在接收该确认后开始在R-EACH上发送。
按照存储访问模式,成员用户站随机选择R-EACH,并在R-EACH上对扇区发送短报头以减小在R-EACH上与其他访问尝试冲突的可能性,冲突会造成访问尝试的损失。扇区在正向公共分配信道(F-CACH)上发送早期确认信道分配消息(EACAM)以对成员用户站分配反向公共控制信道(R-CCCH)。然后成员用户站为EACAM监视正向链路共享信道,并在接收EACAM后在R-CCCH上开始发送。
在另一实施例中,成员用户站在R-EACH上以功率控制访问模式(PCAM)发送。在PCAM中,访问程序类似于存储访问,并在R-EACH上的发送是功率控制的,它是通过在正向公共功率控制信道(F-CPCCH)上接收到R-EACH后分配由基站发送的功率控制位来进行的。
对分组进行发送
当成员用户站想要将语音或数据发送到分组时,成员用户站必须待分配一个反向信道并接到发送的许可。
如上所述,在一实施例中,根据参加主动组后各成员用户站被分配反向链路信道用来发送控制数据,例如R-DCCH。当该组活动结束,成员用户站不需要发送控制数据,因此在组呼叫不活动的预定期后,成员用户站释放该反向链路信道并开始监视用于通信系统访问的不同反向链路信道。在一个实施例中,成员用户站监视反向访问信息(R-ACH)或反向加强访问信道(R-EACH)。接着,当主动呼叫中的成员用户站其不活动相不超过预定期间要求发送用户数据时,通过R-DCCH将控制数据信令消息从成员用户站发送到扇区。如该成员用户站已经释放R-DCCH,则成员用户站在R-ACH或R-EACH上发送控制数据信令消息。
在一实施例中,控制数据信令消息是允许发送的请求。接收到请求后扇区通过成员用户组监视的正向链路信道发出发送的许可。如上所述,当寂静时间超过预定时段,成员用户站停止监视正向链路共享信道,及控制/信令正向链路信道(如果被监视的话),并开始监视决定的正向链路信道,从而转入待用状态。因此,如果存在最近的组活动动不超过预定的不活动期间,则成员用户站正在监视正向链路共享信道或控制/信令正向链路信道;接着在该正向链路共享信道或控制/信令正向链路信道上发出许可。如该成员用户站已经释放正向链路共享信道和控制/信令正向链路信道,则在由成员用户站监视的正向链路信道发出许可。这种情况下,必须对所有成员用户站发送信令消息以在其扇区开始监视正向链路共享信道,以及控制/信令正向信道(如果使用这些信道的话)。
一旦成员用户站接收到使用R-DCCH许可时,反向链路传输可在反向链路信道如R-DCCH上进行。或者,为通信分配的反向链路信道可包括:如反向公共控制信道(R-CCCH),反向基础信道(R-FCH),或反向补充信道(R-SCH)。
R-SCH的分配可以是无限的。当成员用户站通过R-DCCH通知扇区通信已结束,或当扇区检测到成员用户站发送停止达预定的时间量时,该分配就撤消。然后基站可将R-SCH分配给另一要发送到该组的成员用户站。因此在给定时刻至多存在一个成员用户站发送,故在包含支持组呼叫的主动成员用户站的所有扇区中至多有一个R-SCH。
如上所述,在一实施例中,成员用户站不被分配单独R-DCCH,但当需要时对反向链路信令和通信使用R-EACH。因而发送许可的请求就用R-EACH、或R-EACH和R-CCCH来发出。以IS-2000标准中所定义的基本访问、存储访问和功率控制访问的模式使用R-EACH或R-EACH/R-CCCH。
接到请求后,基站将R-FCH、R-DCCH、R-CCCH,或R-SCH分配给成员用户站,并通过成员用户站监视的正向信道发出开始传输的许可。因此,如最近有小组活动且成员用户组正在监视正向链路广播信道,则在正向链路广播信道如成员用户站所监视的F-SCH、F-CCCH/F-BCCH、或F-DCCH上发出该许可。如成员用户站释放正向链路共享信道或F-DCCH,则在F-PDH、F-CCCH上发出许可。这种情况下,还必须对其扇区内的所有成员用户站发送信令消息以开始监视正向链路广播信道,及控制/信令正向信道(如使用的话)。
如果要求发送的成员用户站被授予R-FCH或R-DCCH,则建立并释放R-FCH或R-DCCH的程序按IS-2000标准施行。在分配的R-FCH或R-DCCH或R-EACH/CCCH上发生主动成员用户站与该系统间的信令。
如果要求发送的成员用户站被授予R-CCCH,则由扇区将R-CCCH专门分配给该成员用户站一预定期间以避免与其他成员用户站冲突,或者共用该R-CCCH来提高效率。
如果要求发送的成员用户站被授予R-SCH,则由扇区将R-SCH专门分配给该成员用户站一预定期间。对用户数据传输,R-SCH的分配可以是无限的。当成员用户站通过R-EACH通知扇区其谈话部分已经结束,或当扇区检测到成员用户站不再发送,分配就终止。然后扇区可分配另一成员用户站在R-SCH上进行发送。
另一方面,短于某一阈值对该分组进行的发送发生在R-EACH上而没有请求许可交换。基本访问、存储访问和功率控制访问是对这些信道应用的三个示例性实施例,并在IS-2000中所定义。在这个实施例中,长于阈值的从成员用户组发送到该分组必须遵循请求许可交换。
在上述实施例中,成员用户站在所分配的反向链路信道中开始发送之前,必须送出请求并收到许可。信道分配和发送许可不一定是两个不同的请求。反向信道分配出现在低层例如扇区,而发送许可是在较高层,例如组呼叫管理部门。因此在一个实施例中,成员用户站在信道分配之后就开始发送。这意味着发送许可已经给予。
寂静时间决定
为减小容量浪费,在主动分组呼叫期间,只分配成员用户站正向链路共享信道。因此,扇区和成员用户站必须能确定寂静时间的开始。术语“寂静时间”在这里是用来识别待用或空闲状态。寂静时间开始例如是因为对预定的时段中不再存在对分组的发送请求,或者因为对分组呼叫的预定安排的日程已经到期。在一个实施例中,由接入网络作出决定,并通知成员用户站。或者,成员用户站从长时期活动中决定寂静时间的开始并自动转移成待用/空闲模式,通知或不通知扇区。在另一实施例中,成员用户站和接入网络根据单独日程安排转移成寂静时间。
一旦决定寂静时间的开始,成员用户站就转移成时隙模式运作,只是周期地监视有关公共信道的组呼叫或有关可任选地提供的快速寻呼信道(QPCH)的公共信道。
或者,成员用户组转移到其将有规则地监视的寻呼信道(F-PCH,或F-CCCH和F-BCCH的组合,各任选地与QPCH有关)。
如果成员用户站在主动期间正在监视F-SCH和F-DCCH,那末在寂静时间监视F-DCCH。
在第3替换实施例中,控制实体通过扇区分配成员用户站为分组活动监视组呼叫有关的F-CCCH和F-BCCH,以及为规则的寻呼和发消息监视另一F-CCCH或一对F-CCCH/F-BCCH。
在第4替换实施例中,控制实体通过扇区分配成员用户站为分组活动监视一组F-CCCH和F-BCCH,为规则的寻呼监视F-CCCH、与规则寻呼F-CCCh有关的PQCH,以及为点对多点服务信令监视F-BCCH。成员用户站连续监视组F-CCCH和F-BCCH,以及F-BCCH和QPCH上分配的位置(在IS-2000中称寻呼指示器),为成员用户站决定是否需要也监视它分配的规则寻呼F-CCCH。
主动期间通知
一旦主动期间开始,就通过在寂静时间由成员用户站监视的正向链路信道上发送的消息通知该成员用户站。
在一实施例中,为每个成员用户站在主动状态中所用的正向链路信道是正向公共控制信道(F-CCCH)、正向广播公共信道(F-BCCH),或者F-CCCH或F-BCCH两者。
在一实施例中,所有F-CCCH和F-BCCH由分组呼叫的成员用户站和给定扇区中为其寻呼需要的非成员所共用。这通过在这些正向链路信道上发送中具有适当访问信息来达到。
在另一实施例中,扇区中一些F-CCCH和F-BCCH被专门分配用户组呼叫,其余F-CCCH和F-BCCH被专门分配用于非成员用户站的寻呼。
业内的技术人士将认识到虽然用流程图和方法对各实施例作了说明,但这仅是为了说明。该方法可由装置来实施,在一个实施例中装置包括一处理器,它与发送器、接收器和任何其他适当的AT和/或AP块相连接。
业内的技术人士将理解信息和信号可用多种不同工艺和技术中的任一种来表示。例如,可作为所有上述说明的基准的数据、指令、命令、信息、信号、比特、符号、以及码片均可表示为电压、电流、电磁波、磁场或粒子、光学场或粒子,或它们的任意组合。
业内人士还理解与此处所揭示的实施例有关描述的各种示例的逻辑块、模块、线路和算法步骤等均可作为电子硬件、计算机软件或两者的组合来实施、为清楚地示明这种硬件和软件的互换性,上面描述的各种说明部件、块、模块、线路和步骤一般用它们的功能来描述。是硬件还是软件来实施这种功能取决于特定应用和对整个系统所加的设计限制。熟练的技艺人士可以各种方式对每种特定应用实现所述的功能,但这种实施的决策不应解释为偏离本发明范围的理由。
有关这里揭示的实施例所描述的各说明性逻辑块、模块和电路可以用下列来实施或完成:通用处理器,数字信号处理器(DSP),专用集成电路(ASIC),场可编程阵门阵列(EPGA),或其他可编程逻辑器件,分立门成晶体管逻辑,分立硬件元件,或任何设计用来完成上述功能的它们的组合。通用处理器可以是微处理器,但在替换物中,处理器可以是任何传统处理器、控制器、微控制器、或状态机。处理器也可以实现为计算设备的组合,例如DSP和微处理器的组合,多个微处理器的组合,一个或多个微处理器与DSP芯的结合,或任何其它的这种配置。
有关这里揭示的实施例所描述的方法和算法的步骤,可以直接以硬件、以处理器执行的软件模块,或以两种的组合来实现。软件模块可置于RAM存储器、闪速存储器、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、可拆装盘、CD-ROM,或其他业内人士所知的任何存储媒体形式中。一种示例性的存储媒体连接到处理器,使处理器可以从存储媒体读信息,并写信息到其中。在另一替换实施例中,存储媒体可与处理器成一整体。处理器和存储媒体可置入ASIC中。ASIC可置于用户终端。在一替换性实施例中,处理器和存储媒体可作为分立组件存在于用户终端。
所揭示实施例的前述说明使任一业内技术人士能制造或使用本发明。对业内技术人士而言对这些实施例的各种修改显然是容易的,这里所确定的一般原理可用于其他实施例的不偏离本发明的精神和范围。因此,本发明并不打算受到这里所示的实施例的限制,而是符合与这里揭示的原理和新颖特征一致的最广泛的范围。
本专利文件披露的一部分包括版权保护的材料。版权所有者并不反对专利文件或专利披露的任何人传真复制,如登载在专利商标局专利文件或记录中,但在其他形态下无论如何都在版权所有之列。
Claims (36)
1.一种通信系统中的信道管理方法,其特征在于,它包括:
在对属于一个组的用户站的主动期间,分配至少一个正向链路共享信道;以及
在对用户站的寂静时间分配至少一个正向链路信道。
2.如权利要求1所述的方法,其特征在于,所述在对所述用户站的寂静时间内所述分配至少一个正向链路信道包括:
在对用户站的寂静时间内,分配至少一个正向链路信道;所述至少一个正向链路信道被有关点对点服务和点对多点服务的信息所调制。
3.如权利要求1所述的方法,其特征在于,所述在对所述用户站的寂静时间内分配至少一个正向链路信道包括:
分配的至少一个正向链路信道被有关点对点服务的信息所调制;以及
分配的至少一个正向链路信道被有关点对多点服务的信息所调制。
4.如权利要求1所述的方法,其特征在于,所述在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道包括:
在对属于一个组的用户站的主动期间内,分配至少一个正向链路共享信道;该正向链路共享信道被用户数据和控制数据所调制。
5.如权利要求1所述的方法,其特征在于,还包括:
在对每个用户站的主动期间内,分配一个正向链路专用信道。
6.如权利要求5所述的方法,其特征在于,所述在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道包括:
在对属于一个组的用户站的主动期间内,分配至少一个正向链路共享信道;该正向链路共享信道被用户数据所调制;并且
其中,在对每个用户站的主动期间内分配一个正向链路专用信道包括:
在对每个用户站的主动期间内,分配一个正向链路专用信道;该正向链路专用信道被控制数据所调制。
7.一种通信系统中的信道管理方法,其特征在于,包括:
在对属于一个组的每一用户站的主动期间内,分配至少一个反向链路专用信道;以及
由属于该组的主动用户站,用用户数据和控制数据调制该至少一个反向链路专用信道。
8.如权利要求7所述的方法,其特征在于,还包括:
由属于该组的被动用户站,用控制数据调制该至少一个反向链路专用信道。
9.一种通信系统中的信道管理方法,其特征在于,包括:
对属于一个组的主动用户站,分配至少一个反向链路专用信道;以及
对属于一个组的被动用户站,分配至少一个反向链路公共信道。
10.如权利要求9所述的方法,其特征在于,包括:用用户数据和控制数据调制所述至少一个反向链路专用信道。
11.如权利要求9所述的方法,其特征在于,还包括
用控制数据调制所述至少一个反向链路公共信道。
12.如权利要求9所述的方法,其特征在于,还包括:
用对反向链路信道分配的请求调制所述至少一个反向链路公共信道;以及
用控制数据调制所述分配的反向链路信道。
13.一种通信系统中的信道管理装置,其特征在于,包括:
在对属于一个组的用户站的主动期间内用于分配至少一个正向链路共享信道的装置;以及
在对用户站的寂静时间内用于分配至少一个正向链路信道的装置。
14.如权利要求13所述的装置,其特征在于,所述在对用户站的寂静时间内用于分配至少一个正向链路信道的装置包括:
在对用户站的寂静时间内用于分配至少一个正向链路信道的装置;所述至少一个正向链路信道被有关点对点服务和点对多点服务的信息所调制。
15.如权利要求13所述的装置,特征在于,所述在对用户站的寂静时间内用于分配至少一个正向链路信道的装置包括:
用于分配至少一个被有关点对点服务的信息所调制的正向链路信道;以及
用于分配至少一个被有关点对多点服务的信息所调制的正向链路信道。
16.如权利要求13所述的装置,其特征在于,所述在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道的装置包括:
在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道的装置;所述正向链路共享信道被用户数据和控制数据所调制。
17.如权利要求13所述的装置,其特征在于,还包括:
在对每个用户站的主动期间内分配正向链路专用信道的装置。
18.如权利要求17所述的装置,其特征在于,所述在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道的装置包括:
在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道的装置;所述正向链路共享信道被用户数据所调制;并且
其中,在对每个用户站的主动期间内分配一个正向链路专用信道的装置包括:
在对每个用户站的主动期间内分配正向链路专用信道的装置;所述正向链路专用信道被控制数据所调制。
19.一种通信系统中的信道管理装置,其特征在于,包括:
在对属于一个组的每个用户站的主动期间内分配至少一个反向链路专用信道的装置;以及
由属于所述组的主动用户站用用户数据和控制数据调制所述至少一个反向链路专用信道的装置。
20.如权利要求19所述的装置,其特征在于,还包括:
由属于一个组的被动用户站用控制数据调制该至少一个反向链路专用信道的装置。
21.一种通信系统中的信道管理装置,其特征在于,它包括:
对属于一个组的主动用户站分配至少一个反向链路专用信道的装置;以及
对属于一个组的被动用户站分配至少一个反向链路公共信道的装置。
22.如权利要求21所述的装置,其特征在于,还包括:
用用户数据和控制数据调制所述至少一个反向链路专用信道的装置。
23.如权利要求21所述的装置,其特征在于,还包括:
用控制数据调制所述至少一个反向链路公共信道的装置。
24.如权利要求21所述的装置,其特征在于,还包括:
用对反向链路分配的请求调制所述至少一个反向链路公共信道的装置;以及
用控制数据调制所述分配的反向链路的装置。
25.一种通信系统中的信道管理装置,其特征在于,包括:
在接入网络处的控制单元,被配置成:
在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道;以及
在对所述用户站的寂静时间内分配至少一个正向链路信道;以及
通信耦合于所述控制单元的扇区,配置成发送有关所述分配的信息。
26.如权利要求25所述的装置,其特征在于,通过配置成在对用户站的寂静时间内分配至少一个正向链路信道,所述控制单元在对所述用户站的寂静时间内分配至少一个正向链路信道;所述至少一个正向链路信道用有关点对点服务和点对多点服务的信息所调制。
27.如权利要求25所述的装置,其特征在于,所述控制单元在对所述用户站的寂静时间内分配至少一个正向链路信道被配置成:
分配至少一个用有关点对点服务的信息调制的正向链路信道;以及
分配至少一个用有关点对多点服务的信息调制的正向链路信道。
28.如权利要求25所述的装置,其特征在于,所述控制单元在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道,被配置成:
在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道;所述正向链路共享信道用用户数据和控制数据进行调制。
29.如权利要求25所述的装置,其特征在于,所述控制单元进一步配置成在每个用户站的主动期间内分配一个正向链路专用信道。
30.如权利要求29所述的装置,其特征在于,所述控制单元在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道,被配置成:
在对属于一个组的用户站的主动期间内分配至少一个正向链路共享信道;所述正向链路共享信道用用户数据进行调制;并且
其中,所述控制单元在对每个用户组的主动期间内分配一个正向链路专用信道,被配置成:
在对每个用户站的主动期间内分配一个正向链路专用信道;所述正向链路专用信道用控制数据进行调制。
31.一种通信系统中的信道管理装置,其特征在于,包括:
在接入网络处的控制单元,被配置成在对属于一个组的每个用户站的主动期间内分配至少一个反向链路专用信道;以及
属于所述组的主动用户站,被配置成用用户数据和控制数据调制所述分配的至少一个反向链路专用信道。
32.如权利要求31所述的装置,其特征在于,还包括:
属于所述组的被动用户站,配置成用控制数据调制所述至少一个反向链路专用信道。
33.一种通信系统中的信道管理装置,其特征在于,包括:
在接入网络处的控制单元,配置成:
对属于一个组的主动用户站分配至少一个反向链呼专用信道;以及
对属于所述组的被动用户站分配至少一个反向链呼公共信道;以及
通信耦合于所述控制单元的扇区,配置成发送有关分配的信息。
34.如权利要求33所述的装置,其特征在于,还包括:
属于所述组的主动用户站,配置成用用户数据和控制数据调制所述至少一个反向链路专用信道。
35.如权利要求33所述的装置,其特征在于,还包括:
属于所述组的被动用户站,配置成用控制数据调制所述至少一个反向链路公共信道。
36.如权利要求33所述的装置,其特征在于,还包括:
属于所述组的被动用户站,配置成:
用对反向链路信道分配的请求来调制所述至少一个反向链路公共信道;以及
用控制数据调制所述分配的反向链路信道。
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- 2003-09-29 NO NO20034339A patent/NO20034339L/no not_active Application Discontinuation
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2004
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2005
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2007
- 2007-09-25 AU AU2007219304A patent/AU2007219304C1/en not_active Ceased
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2008
- 2008-06-25 JP JP2008166480A patent/JP2009021996A/ja active Pending
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2010
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101198082B (zh) * | 2006-12-04 | 2011-04-06 | 中兴通讯股份有限公司 | 多载频小区提供mbms业务的方法 |
CN105580379A (zh) * | 2014-08-22 | 2016-05-11 | Lg电子株式会社 | 广播发送设备、广播发送设备的操作方法、广播接收设备、以及广播接收设备的操作方法 |
CN105580379B (zh) * | 2014-08-22 | 2019-08-16 | Lg电子株式会社 | 广播发送设备、广播发送设备的操作方法、广播接收设备、以及广播接收设备的操作方法 |
US10470240B2 (en) | 2014-08-22 | 2019-11-05 | Lg Electronics Inc. | Broadcast transmission apparatus, operation method of broadcast transmission apparatus, broadcast reception apparatus, and operation method of broadcast reception apparatus |
US11019679B2 (en) | 2014-08-22 | 2021-05-25 | Lg Electronics Inc. | Broadcast transmission apparatus, operation method of broadcast transmission apparatus, broadcast reception apparatus, and operation method of broadcast reception apparatus |
CN112672410A (zh) * | 2020-12-21 | 2021-04-16 | 紫光展锐(重庆)科技有限公司 | 一种通信方法、装置、设备及系统 |
CN112672410B (zh) * | 2020-12-21 | 2023-03-07 | 紫光展锐(重庆)科技有限公司 | 一种通信方法、装置、设备及系统 |
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