CN1223765A - 在通信信道建立过程中有选择地抑制数据传输的cdma通信系统 - Google Patents
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Abstract
在通信节点所需的数据通信速率在整个CDMA系统中完全建立之前,能防止节点之间通信的CDMA系统,该系统能选择性地抑制接收节点向始发节点发送一个确认音调,在通信通路以所希望的速率建立之前能阻止话音、传真和调制解调数据的传送。这允许在一个不是精确同步的系统中以多种数据速率可靠地传送编码数据。
Description
本发明一般涉及无线通信系统。更具体地讲,本发明涉及一种根据通信所需带宽有选择地调节数据传输速率而在传输速率调节过程中没有数据丢失的无线数字CDMA通信系统。
最近,电信工业在包括蜂窝、卫星和微波通信的无线技术的应用中取得了很大的进展。随着无线通信系统的普及和使用的增加,分配给每一种无线通信类型的有限带宽显得越发宝贵。由于不可能为现有应用分配支持用户的增长的额外带宽,电信硬件和软件中的许多最近进展都集中于在使用相同或减小的带宽的同时提高数据传输速率。
与数据无线通信相关的一个问题是,当前使用着包括计算机、传真机、自动呼叫应答装置和其它类型的数据网络在内的许多不同类型的通信节点。这些节点可能能够以多种不同的数据速率进行通信,并且必须适当地同步化以避免在通信的建立或维持过程中丢失数据。
通信的建立与同步化通常是用各种不同技术进行的。例如,第4,384,307号美国专利(Kuzmik等)中披露的系统包括一种用于将收发信机连接到一通信线路的通信转接器。该系统需要数据的位电平操作以适当地同步化两个通信节点。利用这种技术的数据重新格式化需要大量的计算,并易于产生错误。
第4,583,124号美国专利(Tsuji等)中公开了另一种类型的系统,该系统通过把每个有关通信节点的信息存储在存储器中使两个节点能够以恰当的通信速度快速地完成同步化。但是,要求始发节点存储每个有关接收节点的信息对于当前通信环境来说是不现实的。
因此,需要有一种简单有效的技术,把一个通信网络的数据传输速率转换到需要的速率,同时保持两个通信节点之间发送数据的完整性。
本发明是一种在整个系统中完全建立起通信节点所需的数据传输速率之前防止通信节点之间的数据传输的CDMA通信系统。该系统有选择地抑制一个接收节点发送到一始发节点的确认音调。因此,直到以恰当的通信速率建立起通信路径之前防止了话音、传真或调制解调器数据的传输。这使得系统能够在可能是缺乏精确同步化的电信系统以多种数据速率可靠地输送编码数据。
因此,本发明的一个目的是要提供一种通过在通信系统达到通信节点所需的数据传输速率之前防止数据通信而可靠地发送编码数据的系统和方法。
在阅读了优选实施例的说明之后,将对本发明的其它目的和优点有更为清楚的了解。
图1是根据本发明的一种码分多址通信系统的示意图;
图2是连接于始发和终端节点的图1的通信系统的方框图;
图3是根据现有技术在始发和终端节点之间建立通信信道的流程图;
图4是根据本发明在始发和终端节点之间建立通信信道的流程图;和
图5是根据本发明的技术的一个基站的方框图。
以下参考附图对优选实施例进行说明,在所有附图中相同的标号代表相同的元件。
图1示出了一个体现本发明的通信网络10。通信网络10一般包括一个或多个基站14,每个基站与多个可能是固定的或移动的用户单元16进行无线通信。每个用户单元16与最靠近的基站14或是提供最强通信信号的基站14通信。基站14还与一个在各基站14之间协调通信的基站控制器20通信。通信网络10也可以连接于一个公共电话交换网(PSTN)22连接,其中基站控制器20也协调基站14与PSTN 22之间的通信。每个基站14最好通过无线链路与基站控制器20通信。尽管基站14与基站控制器20之间的链路显示为无线链路,但是熟悉本领域的技术人员应当清楚也可以为基站14与基站控制器20之间提供陆线。在基站14紧邻基站控制器20时,使用陆线是特别适合的。
基站控制器20执行数种功能。首先,基站控制器20提供与建立和维持用户16、基站14与基站控制器20之间所有无线通信有关的全部越区、管理和维持(OA&M)信号。基站控制器20也提供无线通信系统10与PSTN 22之间的连接。这种连接包括经过基站控制器20进入或离开系统10的多个通信信号的多路复用和多路分解。尽管所示无线通信系统10使用天线发射RF信号,但是熟悉本领域的技术人员应当知道通信也可以通过微波卫星上行线进行。
参考图2,通信系统10一般连接于始发节点40和终端节点44。为了保存尽可能大的带宽,通信系统10有选择地分配支持始发和终端节点40、44要求的数据传输速率所需的带宽。以这种方式,系统10保证了带宽的有效利用。通过32 Kb自适应脉码调制(ADPCM)信道可以有效地发送话音通信。但是,高速传真或数据调制解调器信号需要至少64 Kb脉码调制(PCM)信号,以可靠地发送通信。始发和终端节点40,44也可以利用许多其它类型的调制技术和数据传输速率。系统10必须能够有效地分配带宽,并且根据要求在这些数据通信速率与调制方案之间动态转换。
通信系统10提供了始发和终端节点40,44之间的通信链路。始发和终端节点40,44可以包括计算机、传真机、自动呼叫应答装置、数据网络或这种装置的任何组合。为了健全的数据通信,一定要保证通信系统10在发送任何数据之前转换到通信节点40,44要求的数据传输速率。
参考图3,图3示出了在始发节点40与终端节点44之间建立通信的典型过程。始发节点40周期性地发送指示将要发送数据通信(不是话音通信)的呼叫音调(步骤100)。终端节点44检测从始发节点40发送到终端节点44的呼叫音调(步骤102),终端节点44启动几种动作。首先,终端节点44准备发送数据通信(步骤104)。接着,终端节点44向始发节点40发送应答音调(步骤106)以确认终端节点44已经接收到呼叫音调。一旦接收到应答音调(步骤108),始发节点40开始数据的传输(步骤110),终端节点44接收传输的数据(步骤112)。利用以所需数据传输速率建立起的通信链路,始发和终端节点40,44发送和接收数据,直到通信终止。
使用这种过程的一个问题是,通信系统10的传输速率对于始发和终端节点40,44都是透明的。传输速率从一个低速率(其支持话音通信)至一个高速率(其支持编码数据通信)的变更保证了数据将通过一通信信道可靠和快速地发送。但是,必须在整个通信系统10中完全地建立起这种新的传输速率,以防止错误地解释始发节点40发送的音调。始发节点40可能在系统10从32 Kb的ADPCM完全转换为64Kb的PCM之前开始数据的发送,这将导致数据丢失。
为了避免音调的错误解释和防止致使始发或终端节点40,44的错误操作,本发明在新的传输速率于整个通信系统10中完全建立起之前阻止确认音调传输到始发节点40。这防止了在始发节点40接收应答音调,并保证了通过缺乏必要的精确同步化的通信系统10可靠地以高速率传送编码数据。
以下参考图4说明本发明的系统10的操作。通信系统10用于进行在始发节点40与终端节点44之间的通信。如图所示,始发节点40的动作(步骤202,212和214)和终端节点44的动作(步骤206,207,208和218)与图3中的相同。通信系统10的操作对于始发节点40和终端节点44都是透明的。
在操作中,始发节点40周期性地发送指示数据通信的呼叫音调(步骤202)。通信系统10响应接收的呼叫音调执行几个动作(步骤204)。首先,以用于话音通信的标准通信设置的32Kb的ADPCM接收呼叫音调。系统10检测呼叫音调并启动转换到64Kb的PCM,以便处理高速数据传输。这个转换必须由基站14、用户单元16和基站控制器20执行。尽管系统10立即就开始到新的数据传输速率的转换,但过程要用大约1500msec来执行。因此,系统10以32Kb的ADPCM向终端节点44发送呼叫音调。
终端节点44检测呼叫音调(步骤206)并且准备发送数据通信(步骤207)。终端节点44随后发送当始发节点40接收到时将导致始发节点40开始数据传输的应答音调(步骤208)。
通信系统10接收来自终端节点44的应答音调。但是,系统10在转换到64Kb的PCM在整个系统10中完成之前不将应答音调向前发送给始发节点40。在系统10确认转换到64Kb的PCM已经完成之后,它允许应答音调通过至始发节点40,始发节点40接收应答音调(步骤212)。响应应答音调,始发节点40开始数据传输(步骤214)。系统10接收数据并开始以新的数据传输速率(64Kb的PCM)向终端节点44传输数据(步骤216),终端节点44接收数据(步骤218)。由于已经建立了通信信道,始发和终端节点40,44继续以这种方式通过系统10通信(步骤214,216和218),直到通信终止。
参考图5,图5示出了基站控制器20的更为详细的方框图。基站控制器20至少控制两个通信节点40,44之间的通信链路的一部分。这个链路包括从第一通信节点至基站控制器20的传输路径300,基站控制器20内的传输路径302,和从基站控制器20至第二通信节点的传输路径304。通向和来自基站控制器20的传输路径300,304可以包括多个由基站控制器20控制的基站14和用户单元16。
熟悉本领域的技术人员应当知道通信节点40,44之间的通信信道的建立是一个包括由基站14、用户单元16和基站控制器20执行的多种任务的复杂过程。对整个过程的详细说明超出了本发明的范围。因此,以下仅说明过程中与本发明有关的通信信道的建立的那些部分。
熟悉本领域技术人员都知道,始发节点40与终端节点44之间的通信是通过一个虚信道发送的。由于整个频谱被CDMA通信系统10使用,因此从始发节点40至终端节点44的通信是通过与从终端节点44至始发节点40的通信相同的频带发送的。在建立了虚信道之后,始发和终端节点40,44可以自由地通信。
基站控制器20包括一个呼叫音调检测器310,一个微处理器312,和一个应答音调阻塞器314。呼叫音调检测器310监视已经建立起的通信信道,以便检测呼叫音调。当一个呼叫音调从始发节点40发出时,呼叫音调检测器310检测该呼叫音调,该呼叫音调导致基站控制器20启动至一较高数据传输速率的转换。接下来,微处理器312向通信将要路过的任何其它基站14或用户单元16(以下称为通信装置)发送信息,以便启动至一较高数据传输速率的转换。
微处理器312启动防止应答音调通过系统10发送的应答音调阻塞器314。每个通信装置14,16,20在完成了较高数据传输速率的转换时向基站控制器20的微处理器312发送确认信息。微处理器312随后关闭应答音调阻塞器314,使得应答音调能够向前传送到始发节点40。通信节点40,44通过通信系统10以较高的数据传输速率开始数据传输。
尽管本发明是通过详细地参考优选实施例部分地说明的,但是这种详细的说明只是指导性的,而不是限制性的。例如,在一个替代实施例中,图5中所示基站控制器20执行的功能可以由耦合于始发或终端节点40的基站14执行。基站14的功能也可以与基站控制器20组合在一起,以形成一个主基站。此外,还可以使用不同的数据速率和调制方案。熟悉本领域的技术人员应当了解,可以在结构上和操作模式上进行各种改变而不脱离这里说明中所披露的本发明的精神和范围。
Claims (21)
1.一种在通信网络中承载速率变更过程中抑制选择通信的系统,该系统包括:
用于在第一和第二通信节点之间建立以第一数据速率通信的通信信道的装置;
用于在所述信道上检测来自所述第一节点的传输的装置;
用于确定所述传输是否需要在数据速率上改变为第二数据速率的装置;
用于响应所述确定装置把所述通信信道转换至所述第二数据速率的转换装置;和
用于响应所述确定装置在所述第二数据速率被建立起之前阻塞来自所述第二节点的传输的阻塞装置。
2.如权利要求1所述的系统,其中所述检测装置检测多个选择频率上的音调,和所述音调启动至所述第二数据速率的改变。
3.如权利要求2所述的系统,其中所述转换装置将所述第一数据速率转换为所述较高的第二数据速率。
4.如权利要求3所述的系统,其中所述第一数据速率是32kb/s,和所述第二数据速率是64kb/s。
5.如权利要求4所述的系统,其中所述第一数据速率使用脉码调制,和所述第二数据速率使用自适应脉码调制。
6.如权利要求1所述的系统,其中所述转换装置响应所述确定装置根据所需数据速率和调制类型把所述建立的信道转换到多个替代信道中的一个。
7.一种在传输速率调节过程中有选择地调节数据传输速率而不丢失数据的通信系统,该系统包括:
用于在一始发节点与一终端节点之间建立一通信信道的装置,所述信道包括从所述始发节点至所述终端节点的第一通信路径,和从所述终端节点至所述始发节点的第二通信路径;
用于监视所述第一通信路径的一个信号的装置,所述信号指示对传输速率调节的请求;
用于响应所述检测装置调节所述通信信道的传输速率的调节装置;和
用于响应所述检测装置在建立起恰当的通信速率之前在所述第二通信路径上抑制通信的抑制装置。
8.如权利要求7所述的系统,其中所述监视装置检测具有指示提高数据传输速率请求的选择频率的信号。
9.如权利要求8所述的系统,其中所述调节装置将所述通信信道转换至具有所述较高数据传输速率的第二通信信道。
10.如权利要求9所述的系统,其中所述通信信道具有32kb/s的数据速率,和所述第二通信信道具有64kb/s的数据速率。
11.如权利要求10所述的系统,其中所述通信信道使用脉码调制,和所述第二通信信道使用自适应脉码调制。
12.如权利要求11所述的系统,其中所述信号指示所需的数据速率和调制类型,和所述调节装置响应所述监视装置根据所需数据速率和调制把所述信道转换至多个替代信道中的一个。
13.一种用于变更一通信系统的数据传输速率的方法包括:
以第一数据通信率接收来自一始发节点的第一通信;
检测对所述数据通信率变更的请求;
启动对所述请求的数据通信率的变更;
以所述第一数据速率向一终端节点发送所述第一通信;
接收来自所述终端节点的第二通信;
在所述变更完成之前抑制所述应答音调;
完成所述变更;和
向所述始发节点发送所述第二通信。
14.一种在一通信网络中在信道变更过程中抑制选择通信的系统,该系统包括:
用于在第一和第二通信节点之间建立起一个第一双工通信信道的装置包括一个发射(Tx)部分和一个接收(Rx)部分,所述信道具有第一数据通信率和调制类型;
用于在所述Tx部分检测来自所述第一节点的传输的装置;
用于确定所述传输是否需要改变到一个具有第二数据通信率和调制类型的第二双工通信信道的装置;
用于响应所述确定装置把所述第一通信信道转换到所述第二通信信道的转换装置;和
用于响应所述确定装置在所述第二通信信道建立之前在所述Rx部分上阻塞传输的阻塞装置。
15.如权利要求1所述的系统,其中所述检测装置在所述Tx部分上检测指示需要改变到所述第二通信信道的选择发射频率。
16.如权利要求2所述的系统,其中所述第二通信信道具有比所述第一通信率更快的数据速率。
17.如权利要求3所述的系统,其中所述第一数据通信率是32kb/s,和所述第二数据通信率是64kb/s。
18.如权利要求4所述的系统,其中所述第一数据通信信道使用脉码调制,和所述第二通信信道使用自适应脉码调制。
19.如权利要求1所述的系统,其中所述转换装置响应所述确定装置,根据请求的数据速率和调制将所述建立的信道转换到多个替代信道中的一个。
20.一种在一通信网络中在承载速率变更过程中抑制选择的通信的系统,所述系统包括:
用于在第一和第二通信实体之间建立一通信信道的装置;
用于检测通过所述信道来自所述第一实体的传输的装置;
用于响应所述检测装置确定是否需要一个新的通信信道的确定装置;
用于响应所述确定装置把所述通信信道转换到一个通信信道的转换装置;
用于响应所述确定装置在所述转换完成之前阻塞来自所述第二实体的传输的阻塞装置。
21.一种用于变更一个通信系统的数据传输速率的方法包括:
以第一数据通信率接收来自一始发节点的第一通信;
检测支持所述第一通信所需的数据速率和调制类型;
启动向具有所述数据速率和调制类型的第二通信信道的变更;
以所述第一数据速率向一终端节点发送所述第一通信;
接收来自所述终端节点的第二通信;
在所述变更成之前抑制所述第二通信;和
向所述始发节点发送所述第二通信。
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1996
- 1996-06-27 US US08/671,067 patent/US5953346A/en not_active Expired - Lifetime
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1997
- 1997-06-20 WO PCT/US1997/010760 patent/WO1997050206A1/en active IP Right Grant
- 1997-06-20 CN CN97195947A patent/CN1118981C/zh not_active Expired - Lifetime
- 1997-06-20 EP EP01117741A patent/EP1152564B1/en not_active Expired - Lifetime
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- 1997-06-20 CA CA002259355A patent/CA2259355C/en not_active Expired - Lifetime
- 1997-06-20 EP EP97931304A patent/EP0908036B1/en not_active Expired - Lifetime
- 1997-06-20 EP EP08102289A patent/EP1931078A3/en not_active Withdrawn
- 1997-06-20 PT PT97931304T patent/PT908036E/pt unknown
- 1997-06-20 JP JP50339598A patent/JP3965494B2/ja not_active Expired - Lifetime
- 1997-06-20 ES ES97931304T patent/ES2137907T3/es not_active Expired - Lifetime
- 1997-06-20 AU AU34968/97A patent/AU3496897A/en not_active Abandoned
- 1997-06-20 DE DE0908036T patent/DE908036T1/de active Pending
- 1997-06-20 DK DK97931304T patent/DK0908036T3/da active
- 1997-06-20 KR KR10-2004-7004090A patent/KR100500224B1/ko not_active IP Right Cessation
- 1997-06-20 DE DE69740052T patent/DE69740052D1/de not_active Expired - Lifetime
- 1997-06-20 DE DE69710892T patent/DE69710892T2/de not_active Expired - Lifetime
- 1997-06-20 AT AT97931304T patent/ATE214220T1/de active
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1999
- 1999-07-15 US US09/354,042 patent/US6608825B1/en not_active Expired - Lifetime
- 1999-10-06 HK HK99104357A patent/HK1019276A1/xx not_active IP Right Cessation
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2002
- 2002-02-28 US US10/086,667 patent/US6965611B2/en not_active Expired - Fee Related
- 2002-02-28 US US10/087,640 patent/US6741564B2/en not_active Expired - Lifetime
- 2002-02-28 US US10/086,664 patent/US6741609B2/en not_active Expired - Lifetime
- 2002-02-28 US US10/086,666 patent/US6744781B2/en not_active Expired - Lifetime
- 2002-03-20 HK HK02102141.2A patent/HK1041382B/zh not_active IP Right Cessation
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2004
- 2004-05-24 US US10/852,024 patent/US7835308B2/en not_active Expired - Fee Related
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2010
- 2010-11-15 US US12/946,258 patent/US8699469B2/en not_active Expired - Fee Related
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2013
- 2013-07-26 US US13/952,399 patent/US9247533B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101888260A (zh) * | 2002-04-29 | 2010-11-17 | 美商内数位科技公司 | 无线通信系统用简易及强韧数字码追踪回路 |
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