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Uni-MUMAC: A Unified Down/Up-link MU-MIMO MAC Protocol for IEEE 802.11ac WLANs

机译：Uni-mUmaC：用于IEEE 802.11ac的统一下行/上行链路mU-mImO maC协议   无线局域网

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Due to the dominance of the downlink traffic in Wireless Local Area Networks(WLANs), a large number of previous research efforts have been put to enhancethe transmission from the Access Point (AP) to stations (STAs). The downlinkMulti-User Multiple-Input Multiple-Output (MU-MIMO) technique, supported by thelatest IEEE amendment-802.11ac, is considered as one of the key enhancementsleading WLANs to the Gigabit era. However, as cloud uploading services,Peer-to-Peer (P2P) and telepresence applications get popular, the need for ahigher uplink capacity becomes inevitable. In this paper, a unified down/up-link Medium Access Control (MAC) protocolcalled Uni-MUMAC is proposed to enhance the performance of IEEE 802.11ac WLANsby exploring the multi-user spatial multiplexing technique. Specifically, inthe downlink, we implement an IEEE 802.11ac-compliant MU-MIMO transmissionscheme to allow the AP to simultaneously send frames to a group of STAs. In theuplink, we extend the traditional one round channel access contention to tworounds, which coordinate multiple STAs to transmit frames to the APsimultaneously. 2-nd round Contention Window (CW2nd), a parameter that makesthe length of the 2-nd contention round elastic according to the trafficcondition, is introduced. Uni-MUMAC is evaluated through simulations insaturated and non-saturated conditions when both downlink and uplink trafficare present in the system. We also propose an analytic saturation model tovalidate the simulation results. By properly setting CW2nd and otherparameters, Uni-MUMAC is compared to a prominent multi-user transmission schemein the literature. The results exhibit that Uni-MUMAC not only performs well inthe downlink-dominant scenario, but it is also able to balance both thedownlink and uplink throughput in the emerging uplink bandwidth-hungryscenario.
机译：由于无线局域网（WLAN）中下行链路流量的优势，已经进行了大量的先前研究工作，以增强从接入点（AP）到站点（STA）的传输。最新的IEEE修正案802.11ac支持的下行链路多用户多输入多输出（MU-MIMO）技术被认为是将WLAN引入千兆时代的关键增强之一。但是，随着云上载服务，对等（P2P）和远程呈现应用程序的普及，对更高的上行链路容量的需求变得不可避免。本文通过探索多用户空间复用技术，提出了一种统一的下行/上行媒体访问控制（MAC）协议Uni-MUMAC，以提高IEEE 802.11ac WLAN的性能。具体而言，在下行链路中，我们实现了符合IEEE 802.11ac的MU-MIMO传输方案，以允许AP同时向一组STA发送帧。在上行链路中，我们将传统的一轮信道访问竞争扩展到两轮，它们协调多个STA同时向AP发送帧。引入了第二轮争用窗口（CW2nd），该参数根据交通状况使第二轮争用轮的长度具有弹性。当系统中同时存在下行链路和上行链路流量时，Uni-MUMAC通过模拟饱和和非饱和条件进行评估。我们还提出了一个解析饱和度模型来验证仿真结果。通过正确设置CW2nd和其他参数，Uni-MUMAC与文献中著名的多用户传输方案进行了比较。结果表明，Uni-MUMAC不仅在下行链路占主导的情况下表现良好，而且还能够在新兴的上行链路带宽匮乏的情况下平衡下行链路和上行链路吞吐量。

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