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802.11ec: Collision Avoidance Without Control Messages

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Executive Summary

In this paper, the authors 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: efficiency, as it permits a near order of magnitude reduction of the control time; robustness, because codes are short and easily detectable even at low SINR and even while a neighbor is transmitting data.

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