Rate adaptation for 802.11 multiuser MIMO networks

Wei Liang Shen*, Yu Chih Tung, Kuang Che Lee, Ching-Ju Lin, Shyamnath Gollakota, Dina Katabi, Ming Syan Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

62 Scopus citations

Abstract

In multiuser MIMO (MU-MIMO) networks, the optimal bit rate of a user is highly dynamic and changes from one packet to the next. This breaks traditional bit rate adaptation algorithms, which rely on recent history to predict the best bit rate for the next packet. To address this problem, we introduce TurboRate, a rate adaptation scheme for MU-MIMO LANs. TurboRate shows that clients in a MU-MIMO LAN can adapt their bit rate on a per-packet basis if each client learns two variables: its SNR when it transmits alone to the access point, and the direction along which its signal is received at the AP. TurboRate also shows that each client can compute these two variables passively without exchanging control frames with the access point. A TurboRate client then annotates its packets with these variables to enable other clients to pick the optimal bit rate and transmit concurrently to the AP. A prototype implementation in USRP-N200 shows that traditional rate adaptation does not deliver the gains of MU-MIMO WLANs, and can interact negatively with MU-MIMO, leading to low throughput. In contrast, enabling MUMIMO with TurboRate provides a mean throughput gain of 1.7x and 2.3x, for 2-antenna and 3-antenna APs respectively.

Original languageEnglish
Title of host publicationMobiCom'12 - Proceedings of the 18th Annual International Conference on Mobile Computing and Networking
Pages29-39
Number of pages11
DOIs
StatePublished - 28 Sep 2012
Event18th Annual International Conference on Mobile Computing and Networking, MobiCom 2012 - Istanbul, Turkey
Duration: 22 Aug 201226 Aug 2012

Publication series

NameProceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM

Conference

Conference18th Annual International Conference on Mobile Computing and Networking, MobiCom 2012
CountryTurkey
CityIstanbul
Period22/08/1226/08/12

Keywords

  • Multiuser MIMO networks
  • Rate adaptation

Fingerprint Dive into the research topics of 'Rate adaptation for 802.11 multiuser MIMO networks'. Together they form a unique fingerprint.

  • Cite this

    Shen, W. L., Tung, Y. C., Lee, K. C., Lin, C-J., Gollakota, S., Katabi, D., & Chen, M. S. (2012). Rate adaptation for 802.11 multiuser MIMO networks. In MobiCom'12 - Proceedings of the 18th Annual International Conference on Mobile Computing and Networking (pp. 29-39). (Proceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM). https://doi.org/10.1145/2348543.2348551