CN103081373A - 用于ul mu mimo信令和差错处理的技术 - Google Patents
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Abstract
本发明的一个实施例提供一种无线站(STA),该STA包括可操作以在无线网络中进行通信的收发器,其中收发器适于使用使无线站能够传递包括期望调制编码方案(MCS)的必要信息的信令。
Description
背景技术
有可能使用上行链路(UL)多用户多输入多输出(MU MIMO)技术来增加无线网络中的基本服务集(BSS)的网络容量。通过UL MU MIMO,准许多个STA同时(在时间和频率上)向多天线接入点(AP)进行传送;所产生的信号由AP的MIMO均衡器来分离。
为了促进UL MU MIMO传输,AP基于从STA所传递的信息来调度来自多个STA的上行链路传输。但是,当前,不存在用于在无线网络中操作的无线站(STA)关于UL MU MIMO传输的相关信息通知AP的信令(signaling)机制以及区分因干扰和噪声引起的分组差错(packet error)与来自冲突的分组差错的差错处理机制。
因此,迫切需要解决MAC信令问题以支持上行链路多用户MIMO(UL MU MIMO)传输的技术。
附图说明
在本说明书的结束部分具体指出并且明确要求保护被看作是本发明的主题。但是,通过在结合附图阅读时参照以下详细描述,可最好地了解关于本发明的操作的组织和方法及其目的、特征、优点,附图包括:
图1提供按照本发明的实施例的请求传送(request to transmit: RTX)的示例帧格式;
图2是按照本发明的实施例的UL MU MIMO TXOP的图示;
图3提供按照本发明的实施例的清除传送(clear to transmit: CTX)的第一示例帧格式;
图4提供按照本发明的实施例的清除传送(CTX)的第二示例帧格式;
图5示出按照本发明的实施例的UL MU MIMO TXOP(差错处理)的图示;以及
图6示出按照本发明的实施例、可包含在UL MU MIMO TXOP中的不同接入类别(AC)的图示。
将会理解,为了说明的简洁和清楚起见,图中所示的元件不一定按比例绘制。例如,为了清楚起见,一部分元件的尺寸相对于其它元件进行放大。此外,在认为适当的情况下,附图之中重复参考标号,以表示对应或相似的元件。
具体实施方式
在以下详细描述中,提出大量特定细节,以便提供对本发明的透彻了解。但是,本领域的技术人员会理解,即使没有这些具体细节,也可实施本发明。在其它情况下,没有详细描述众所周知的方法、过程、组件和电路,以免使本发明模糊不清。
虽然本发明的实施例不限于这个方面,但是利用例如“处理”、“计算”、“确定”、“建立”、“分析”、“检查”等的术语的论述可表示计算机、计算平台、计算系统或者其它电子计算装置的操作(一个或多个)和/或过程(一个或多个),其将表示为计算机的寄存器和/或存储器中的物理(例如电子)量的数据操纵和/或转换为其它数据,其它数据类似地表示为计算机的寄存器和/或存储器或者可存储执行操作和/或过程的指令的其它信息存储介质中的物理量。
虽然本发明的实施例不限于这个方面,但是本文所使用的术语“多个”可包括例如“多个”或者“两个或更多”。术语“多个”可在本说明书中通篇用于描述两个或更多组件、装置、元件、单元、参数等。例如,“多个站”可包括两个或更多站。
本发明的实施例提供使无线站(STA)能够与AP之间传递诸如期望调制编码方案(MCS)和接入类别(AC)之类的必要信息的信令机制。此外,本发明的实施例可提供用于上行链路多用户多输入多输出无线站(UL MU MIMO STA)的差错处理机制。
启用UL MU MIMO的STA使用增强分布信道接入(EDCA)来竞争介质。在STA赢得竞争之后,它向AP传送请求传送(RTX)帧。RTX帧包含每一AC的缓冲业务信息、即将到来的UL MU MIMO传输的期望MCS以及即将到来的UL MU MIMO传输的期望AC数量。
现在来看图1,一般示为100的是RTX的示例帧格式。它可包括帧控制105、持续时间110、RA 115、TA 120、AC VI 125的缓冲业务12、AC BK 130的缓冲业务以及期望MCS 135。要注意,期望MCS字段135是RTX帧中的强制字段,而缓冲业务字段125和130是可选的。缓冲业务字段125和130表示在即将到来的UL MU MIMO传输之后的剩余缓冲业务。
基于期望MCS和缓冲业务信息,STA计算TXOP的持续时间。RTX中的持续时间字段设置TXOP的持续时间。在接收RTX帧时,AP采用清除传送(CTX)帧进行应答。图2在200处示出UL MU MIMO TXOP的过程。STA(即,STA1)向AP传送RTX 205。RTX 205发起TXOP。在AP传送包括作为RA的多播地址或广播地址的CTX 210之后,由CTX轮询的STA基于CTX帧210中指示的信息来传送数据帧215、220和225。在正确地接收一个或多个帧之后,AP采用一个或多个BA 230进行应答。
在CTX帧210中,AP包括一列STA的AID、每个STA的最大MCS或流数量以及即将到来的UL MU MIMO传输的AC数量。
图3在300处提供按照本发明的实施例的清除传送(CTX)的第一示例帧格式。它可包括帧控制305、持续时间310、RA 315、AID1 320、AID 1的最大MCS 325、AID N 330以及AIDN的最大MCS 335。
图4在400处提供按照本发明的实施例的清除传送(CTX)的第二示例帧格式。这个实施例可包括帧控制405、持续时间410、RA 415、AID1 420、AID 1的流数量425、AID N 430以及AID N的流数量435。
现在来看图5,在500处是按照本发明的实施例的UL MU MIMO TXOP(差错处理)的图示。图5示出没有正确地接收UL MU MIMO传输之一时的示例。如果STA 2没有接收其自己的BA(示为510,其中除去ST2的数据)而是从AP接收到其它STA的BA(例如,Data(STA1)520和Data(STA3)530),则该STA应当通过设置CW=CWmin来发起成功补偿(backoff)。这是因为,如果AP能够对UL MU MIMO传输中的数据帧的任一个进行解码并且回送至少一个BA,则在AP不存在冲突。因此,分组破坏的最可能原因归因于干扰、信道变化和噪声。在这种情况下,STA不应当发起指数补偿。类似地,如果STA具有更多业务要发送并且它从AP接收到至少一个BA,则即使BA不是预计送往它自己,它也能够发起成功补偿。如果没有从AP接收到BA,则STA发起指数补偿。
现在来看图6,图6是示出不同接入类别(AC)可包含在同一UL MU MIMO传输中的图示600。AC_VI 610:视频接入类别,AC_VO 620:语音接入类别,以及AC_BE 630:尽力(best effort)接入类别。虽然本文中未示出,但是AC_BK(背景接入类别)可作为本发明的一个实施例来提供。
虽然本文中示出和描述了本发明的某些特征,但是本领域的技术人员可想到许多修改、替换、变更以及等效方案。因此要理解,所附权利要求书预计涵盖落入本发明的真实精神之内的所有这类修改和变更。
Claims (21)
1. 一种无线站(STA),包括:
收发器,可操作以用于在无线网络中进行通信,其中所述收发器适于使用使所述无线站能够传递包括期望调制编码方案(MCS)的必要信息的信令。
2. 如权利要求1所述的无线站,其中,所述收发器还适于实现用于上行链路多用户多输入多输出(UL MU MIMO)无线站的差错处理。
3. 如权利要求2所述的无线站,其中,所述收发器还适于在所述UL MU MIMO传输中包含下列接入类别(AC)的一个或多个:AC_VI:视频接入类别,AC_VO:语音接入类别,AC_BE 630:尽力接入类别,以及AC_BK:背景接入类别。
4. 如权利要求2所述的无线站,其中,所述差错处理区分因干扰和/或噪声引起的分组差错与冲突。
5. 如权利要求4所述的无线站,其中,所述STA使用请求传送(RTX)帧,并且所述帧包含每一所述AC的缓冲业务信息以及即将到来的UL MU MIMO传输的所述期望MCS。
6. 如权利要求5所述的无线站,其中,所述STA能够与所述无线网络中的接入点(AP)进行通信,并且能够向所述AP发送清除传送(CTX)帧,所述CTX帧包括一列STA的AID以及每个STA的最大MCS或流数量。
7. 如权利要求6所述的无线站,其中,当没有正确地接收从所述STA到所述AP的所述UL MU MIMO传输之一时,如果在所述无线网络中进行通信的附加无线站没有接收其自己的BA而是从所述AP接收到其它STA的BA,则所述STA将通过设置CW=CWmin来发起成功补偿,因为所述AP能够对所述UL MU MIMO传输中的任何数据帧进行解码,并且在所述AP不存在冲突时回送至少一个BA,由此所述STA不应当发起指数补偿,以及其中如果所述STA具有更多业务要发送并且从所述AP接收到至少一个BA,则即使所述BA不是预计送往它自己,它也能够发起成功补偿,而如果没有从所述AP接收到BA,则所述STA发起指数补偿。
8. 一种方法,包括:
操作无线网络中的收发器,并且使所述收发器适于使用使所述无线站能够传递包括期望调制编码方案(MCS)的必要信息的信令。
9. 如权利要求8所述的方法,还包括使所述收发器适于实现用于上行链路多用户多输入多输出(UL MU MIMO)无线站的差错处理。
10. 如权利要求9所述的方法,还包括所述差错处理区分因干扰和/或噪声引起的分组差错与冲突。
11. 如权利要求10所述的方法,其中,所述STA使用请求传送(RTX)帧,并且所述帧包含每一所述AC的缓冲业务信息以及即将到来的UL MU MIMO传输的所述期望MCS。
12. 如权利要求11所述的方法,其中,所述STA能够与所述无线网络中的接入点(AP)进行通信,并且能够向所述AP发送清除传送(CTX)帧,所述CTX帧包括一列STA的AID以及每个STA的最大MCS或流数量。
13. 如权利要求12所述的方法,其中,当没有正确地接收从所述STA到所述AP的所述UL MU MIMO传输之一时,如果在所述无线网络中进行通信的附加无线站没有接收其自己的BA而是从所述AP接收到其它STA的BA,则所述STA将通过设置CW=CWmin来发起成功补偿,因为所述AP能够对所述UL MU MIMO传输中的任何数据帧进行解码,并且在所述AP不存在冲突时回送至少一个BA,由此所述STA不应当发起指数补偿,以及其中如果所述STA具有更多业务要发送并且从所述AP接收到至少一个BA,则即使所述BA不是预计送往它自己,它也能够发起成功补偿,而如果没有从所述AP接收到BA,则所述STA发起指数补偿。
14. 一种基站(BS),包括:
收发器,适于与无线网络中的无线站(STA)的通信,所述STA适于使用使所述STA能够向所述BS传递包括期望调制编码方案(MCS)的必要信息的信令。
15. 如权利要求14所述的BS,其中,所述STA还适于实现用于上行链路多用户多输入多输出(UL MU MIMO)无线站的差错处理。
16. 如权利要求15所述的BS,其中,所述差错处理区分因干扰和/或噪声引起的分组差错与冲突。
17. 一种采用计算机可执行指令来编码的计算机可读介质,所述指令在被访问时使机器执行包括下列步骤的操作:
操作无线网络中的收发器,并且使所述收发器适于使用使所述无线站能够传递包括期望调制编码方案(MCS)的必要信息的信令。
18. 如权利要求17所述的计算机可读介质,所述机器使所述收发器适于实现用于上行链路多用户多输入多输出(UL MU MIMO)无线站的差错处理。
19. 如权利要求18所述的计算机可读介质,还包括所述差错处理区分因干扰和/或噪声引起的分组差错与冲突。
20. 如权利要求19所述的计算机可读介质,其中,所述STA使用请求传送(RTX)帧,并且所述帧包含每一所述AC的缓冲业务信息、即将到来的UL MU MIMO传输的所述期望MCS以及即将到来的UL MU MIMO传输的所述期望AC数量。
21. 如权利要求20所述的计算机可读介质,其中,所述STA能够与所述无线网络中的接入点(AP)进行通信,并且能够向所述AP发送清除传送(CTX)帧,所述CTX帧包括一列STA的AID、每个STA的最大MCS或流数量以及即将到来的UL MU MIMO传输的所述AC数量。
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EP2614601A1 (en) | 2013-07-17 |
WO2012033665A1 (en) | 2012-03-15 |
US8649358B2 (en) | 2014-02-11 |
US20140204858A1 (en) | 2014-07-24 |
EP2614601A4 (en) | 2016-07-06 |
US20120060075A1 (en) | 2012-03-08 |
KR20130045396A (ko) | 2013-05-03 |
KR101461347B1 (ko) | 2014-11-13 |
BR112013004783A2 (pt) | 2017-09-19 |
US9143268B2 (en) | 2015-09-22 |
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