MU-MIMO MAC protocols for wireless local area networks: a survey

Liao, Ruizhi; Bellalta, Boris; Oliver Riera, Miquel; Niu, Zhisheng

doi:http://dx.doi.org/10.1109/COMST.2014.2377373

MU-MIMO MAC protocols for wireless local area networks: a survey

Citation

Liao R, Bellalta B, Oliver M, Niu Z. MU-MIMO MAC protocols for wireless local area networks: a survey. IEEE Communications Surveys and Tutorials. 2014 Dec 4;18(1):162-83. DOI: 10.1109/COMST.2014.2377373

Abstract

As wireless devices boom and bandwidth-hungry applications (e.g., video and cloud uploading) get popular, today's wireless local area networks (WLANs) become not only crowded but also stressed at throughput. Multiuser multiple-input-multiple-output (MU-MIMO), an advanced form of MIMO, has gained attention due to its huge potential in improving the performance of WLANs. This paper surveys random access-based medium access control (MAC) protocols for MU-MIMO-enabled WLANs. It first provides background information about the evolution and the fundamental MAC schemes of IEEE 802.11 Standards and Amendments, and then identifies the key requirements of designing MU-MIMO MAC protocols for WLANs. After this, the most representative MU-MIMO MAC proposals in the literature are overviewed by benchmarking their MAC procedures and examining the key components, such as the channel state information acquisition, decoding/precoding, and scheduling schemes. Classifications and discussions on important findings of the surveyed MAC protocols are provided, based on which, the research challenges for designing effective MU-MIMO MAC protocols, as well as the envisaged MAC's role in the future heterogeneous networks, are highlighted.