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A New Congestion Control Algorithm for Vehicle to Vehicle Safety Communications

차량 안전 통신을 위한 새로운 혼잡 제어 알고리즘 제안

  • Yi, Wonjae (Defense Agency for Technology and Quality)
  • Received : 2017.01.23
  • Accepted : 2017.05.12
  • Published : 2017.05.31

Abstract

Vehicular safety service reduces traffic accidents and traffic congestion by informing drivers in advance of threats that may occur while driving using vehicle-to-vehicle (V2V) communications in a wireless environment. For vehicle safety services, every vehicle must broadcasts a Basic Safety Message(BSM) periodically. In congested traffic areas, however, network congestion can easily happen, reduce the message delivery ratio, increase end-to-end delay and destabilize vehicular safety service system. In this paper, to solve the network congestion problem in vehicle safety communications, we approximate the relationship between channel busy ratio and the number of vehicles and use it to estimate the total network congestion. We propose a new context-aware transmit power control algorithm which controls the transmission power based on total network congestion. The performance of the proposed algorithm is evaluated using Qualnet, a network simulator. As a result, the estimation of total network congestion is accurately approximated except in specific scenarios, and the packet error rate in vehicle safety communication is reduced through transmit power control.

Keywords

Congestion Control;Context Awareness;Transmit Power Control;Vehicular Safety Applications;V2X Communication

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