한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

  • 제38B권7호
  • /
  • Pages.543-552
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  • 2013
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  • 1226-4717(pISSN)
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  • 2287-3880(eISSN)
한국통신학회 (The Korean Institute of Commucations and Information Sciences)
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베이지안 게임모델을 적용한 P-persistent MAC 기반 주기적 안정 메시지 전송 방법

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

  • 권영호 (한양대학교 전자컴퓨터통신공학부 차세대네트워크 연구실) ;
  • 이병호 (한양대학교 컴퓨터공학부 차세대네트워크 연구실)
  • 투고 : 2013.06.10
  • 심사 : 2013.07.17
  • 발행 : 2013.07.31
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초록

차량통신간 자동차의 정보를 포함하는 메시지인 비콘을 주변의 자동차들에게 주기적으로 전송함으로 차량간의 안전을 보장해야 할 필요가 있다. 그러나 IEEE 802.11p/WAVE 환경에서는 혼잡상황에서 비콘 전송을 경쟁윈도우(Contention window)를 기반으로 한 MAC (Medium Access Control)에서 해결하도록 하였기 때문에 비콘 전송 과정에 충돌이 발생한다. 본 논문에서는 차량 혼잡 상황에서 비콘의 충돌을 막기 위해서 MAC 구조를 슬롯 p-persistent CSMA (Carrier Sense Multiple Access)라 가정하여 전송 확률에 대한 보수행렬(payoff)을 이용한 비 협조적 베이지안 게임이론을 적용하여 베이지안 내쉬 균형점(BNE)을 도출하였다. 본 논문에서는 도출된 BNE를 가지고 포화 상태에서 비콘 전송률을 높일 수 있는 혼잡 제어 알고리즘을 제안했다. 제안된 알고리즘으로 경쟁윈도우크기와 주변 자동차 수에 관련된 함수를 통해 전송 확률을 계산하였다. 시뮬레이션 결과를 통해서 제안된 알고리즘이 안정적으로 동작함을 보였다.

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.

키워드

참고문헌

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피인용 문헌

  1. Channel assignment for 802.11p-based multi-radio multi-channel networks considering beacon message dissemination using Nash bargaining solution vol.15, pp.3, 2014, https://doi.org/10.7472/jksii.2014.15.3.63
  2. Bayesian game-theoretic approach based on 802.11p MAC protocol to alleviate beacon collision under urban VANETs vol.17, pp.1, 2016, https://doi.org/10.1007/s12239-016-0018-9