802.11ec: Collision avoidance without control messages

Eugenio Magistretti, Omer Gurewitz, Edward W. Knightly

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

58 Scopus citations

Abstract

In this paper, we design, implement and evaluate 802.11ec (Encoded Control), an 802.11-based protocol without control messages: instead, 802.11ec employs correlatable symbol sequences, which together with the timing the codes are transmitted, encode all control information and change the fundamental design properties of the MAC. The use of correlatable symbol sequences provides two key advantages: (i) efficiency, as it permits a near order of magnitude reduction of the control time; (ii) robustness, because codes are short and easily detectable even at low SINR and even while a neighbor is transmitting data. We implement 802.11ec on an FPGA-based software defined radio. We perform a large number of experiments and show that, compared to 802.11 (with and without RTS/CTS), 802.11ec achieves a vast efficiency gain in conveying control information and resolves key throughput and fairness problems in the presence of hidden terminals, asymmetric topologies, and general multi-hop topologies.

Original languageEnglish
Title of host publicationMobiCom'12 - Proceedings of the 18th Annual International Conference on Mobile Computing and Networking
Pages65-76
Number of pages12
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
Country/TerritoryTurkey
CityIstanbul
Period22/08/1226/08/12

Keywords

  • 802.11
  • Channel access
  • Collision avoidance
  • Control messages
  • RTS/CTS
  • Signal correlation
  • WLANs

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