Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2014, Vol. 37 ›› Issue (1): 39-42.doi: 10.13190/j.jbupt.2014.01.009

• Papers • Previous Articles     Next Articles

Comprehensive Analysis Model for MAC Layer in Vehicular Networks Based on Markov Chain

SUN Wei1, ZHANG He-sheng1,2, PAN Cheng1, YANG Jun1   

  1. 1. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China;
    2. State Key Laboratory of Rail Traffic Control and Safety, Beijing 100044, China
  • Received:2013-04-24 Online:2014-02-28 Published:2014-01-07

Abstract:

The enhanced distributed channel access mechanism is adopted by IEEE 802.11p medium access control (MAC) layer,which is used for communication in vehicular ad hoc networks. An analysis model based on two-dimensional Markov chain, colligated the saturated and unsaturated condition, was proposed to study the quality of service (QoS) requirements of different applications, taking different contention windows, internal collision and frozen mechanism into account. On this basis, the performance metrics, such as normalized throughput and drop rate, were studied. The results show that the value of normalized throughput decreases with the increasing number of vehicles, but increases with the packet generation increasing. The drop rate increases with the increasing number of vehicles as well. However, the higher priority categories have larger value of normalized throughput, which verifies that the IEEE 802.11p can provide QoS for different messages.

Key words: IEEE 802.11p, enhanced distributed channel access, Markov chain, modeling and analyzing

CLC Number: