Uni-MUMAC: a unified down/up-link MU-MIMO MAC protocol for IEEE 802.11ac WLANs
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- 作者：Ruizhi Liao ; Boris Bellalta ; Trang Minh Cao ; Jaume Barcelo…
- 关键词：MAC ; MU ; MIMO ; Down/up ; link ; IEEE 802.11ac ; WLANs
- 刊名：Wireless Networks
- 出版年：2015
- 出版时间：July 2015
- 年：2015
- 卷：21
- 期：5
- 页码：1457-1472
- 全文大小：1,472 KB
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31.Kumar, A., Altman, E - 作者单位：Ruizhi Liao (1)
Boris Bellalta (1)
Trang Minh Cao (1)
Jaume Barcelo (1)
Miquel Oliver (1)
1. Department of Information and Communication Technologies, Universitat Pompeu Fabra, 08018, Barcelona, Spain - 刊物类别：Computer Science
- 刊物主题：Computer Communication Networks
Electronic and Computer Engineering
Business Information Systems - 出版者：Springer Netherlands
- ISSN：1572-8196
文摘
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 enhance the downlink?transmission, namely, from the Access Point (AP) to stations (STAs). The downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) technique, supported by the latest IEEE amendment-802.11ac, is considered as one of the key enhancements leading WLANs to the Gigabit era. However, as cloud uploading services, Peer-to-Peer and telepresence applications get popular, the need for higher uplink capacity becomes inevitable. In this paper, a unified down/up-link Medium Access Control (MAC) protocol called Uni-MUMAC is proposed to enhance the performance of IEEE 802.11ac WLANs by exploring the multi-user spatial multiplexing technique. Specifically, in the downlink, we implement an IEEE 802.11ac-compliant MU-MIMO transmission scheme to allow the AP to simultaneously send frames to a group of STAs. In the uplink, we extend the traditional one round channel access contention to two rounds, which coordinate multiple STAs to transmit frames to the AP simultaneously. 2-nd round Contention Window \((CW_{\rm 2nd})\), a parameter that makes the length of the 2-nd contention round elastic according to the traffic condition, is introduced. Uni-MUMAC is evaluated through simulations in saturated and non-saturated conditions when both downlink and uplink traffic are present in the system. We also propose an analytic saturation model to validate the simulation results. By properly setting \(CW_{\rm 2nd}\) and other parameters, Uni-MUMAC is compared to a prominent multi-user transmission scheme in the literature. The results exhibit that Uni-MUMAC not only performs well in the downlink-dominant scenario, but it is also able to balance both the downlink and uplink throughput in the emerging uplink bandwidth-hungry scenario.