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http://dx.doi.org/10.7840/kics.2013.38B.7.543

A Stability of P-persistent MAC Scheme for Periodic Safety Messages with a Bayesian Game Model  

Kwon, YongHo (한양대학교 전자컴퓨터통신공학부 차세대네트워크 연구실)
Rhee, Byung Ho (한양대학교 컴퓨터공학부 차세대네트워크 연구실)
Abstract
For the safety messages in IEEE 802.11p/WAVE vehicles network environment, strict periodic beacon broadcasting requires status advertisement to assist the driver for safety. In crowded networks where beacon message are broadcasted at a high number of frequencies by many vehicles, which used for beacon sending, will be congested by the wireless medium due to the contention-window based IEEE 802.11p MAC. To resolve the congestion, we consider a MAC scheme based on slotted p-persistent CSMA as a simple non-cooperative Bayesian game which involves payoffs reflecting the attempt probability. Then, we derive Bayesian Nash Equilibrium (BNE) in a closed form. Using the BNE, we propose new congestion control algorithm to improve the performance of the beacon rate under saturation condition in IEEE 802.11p/WAVE vehicular networks. This algorithm explicitly computes packet delivery probability as a function of contention window (CW) size and number of vehicles. The proposed algorithm is validated against numerical simulation results to demonstrate its stability.
Keywords
vehicular safety communications; game theory; 802.11p; beacon; p-persistent;
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