Leader-Contention-Based User Matching for 802.11 Multiuser MIMO Networks
Leader-Contention-Based User Matching for 802.11 Multiuser MIMO Networks
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DOI：
10.1109/twc.2014.2320908
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发表时间：
2014-04
影响因子：
10.4
通讯作者：
Tung-Wei Kuo;Kuang-Che Lee;K. Lin;Ming-Jer Tsai
中科院分区：
文献类型：
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作者：
Tung-Wei Kuo;Kuang-Che Lee;K. Lin;Ming-Jer Tsai
在多用户 MIMO (MU-MIMO) LAN 中，客户端可实现的吞吐量取决于谁正在与其同时进行传输。然而，现有的 MU-MIMO MAC 协议使客户端能够使用传统的 802.11 竞争来争夺上行链路上的并发传输机会。这种基于竞争的协议不仅在多轮竞争上浪费了大量的信道时间，而且由于用户随机加入并发传输而没有考虑其信道特性，因此无法最大限度地提供MU-MIMO的增益。为了解决这种低效率问题，本文引入了 MIMOMate，这是一种基于领导者竞争的 MU-MIMO MAC 协议，可根据客户端的信道特性将客户端匹配为并发发送器，以最大程度地提供 MU-MIMO 增益，同时确保所有用户公平共享并发传输机会。此外，MIMOMate 使用传统的 802.11 CSMA/CA 选举匹配用户的领导者来争夺传输机会。因此，它只需要并发流的单个争用开销，并且可以与传统 802.11 设备兼容。 USRP N200 中的原型实现表明，对于两天线和三天线 AP 场景，MIMOMate 比传统的基于竞争的协议分别实现了 1.42 倍和 1.52 美元的平均吞吐量增益，并且还为客户端提供了公平性。
In multiuser MIMO (MU-MIMO) LANs, the achievable throughput of a client depends on who is transmitting concurrently with it. Existing MU-MIMO MAC protocols, however, enable clients to use the traditional 802.11 contention to contend for concurrent transmission opportunities on the uplink. Such a contention-based protocol not only wastes lots of channel time on multiple rounds of contention but also fails to maximally deliver the gain of MU-MIMO because users randomly join concurrent transmissions without considering their channel characteristics. To address such inefficiency, this paper introduces MIMOMate, a leader-contention-based MU-MIMO MAC protocol that matches clients as concurrent transmitters according to their channel characteristics to maximally deliver the MU-MIMO gain while ensuring all users fairly share concurrent transmission opportunities. Furthermore, MIMOMate elects the leader of the matched users to contend for transmission opportunities using traditional 802.11 CSMA/CA. It hence requires only a single contention overhead for concurrent streams and can be compatible with legacy 802.11 devices. A prototype implementation in USRP N200 shows that MIMOMate achieves an average throughput gain of 1.42× and $1.52× over the traditional contention-based protocol for two- and three-antenna AP scenarios, respectively, and also provides fairness for clients.