一种分发车用安全信息的单跳广播协议

单跳广播是分发车用安全信息的基本方法。在车用安全信息广播中,预约信道机制和信道状态指示机制是影响安全信息及时可靠传输的关键问题。本文首先研究了现有的信道预约机制和信道状态指示机制,分析了其对于车用安全信息分发的局限性,提出了一种利用忙音预约一跳信道、指示一跳信道状态的单跳广播协议,并在OPNET网络仿真平台上,进行了仿真实验。实验结果表明,和没有预约信道、以及预约两跳信道的单跳广播协议相比,本文提出的单跳广播协议的性能稳健性较好,更适合于分发车用安全信息。

A One-hop Broadcasting Protocol for Vehicular Safety Message Dissemination

one-hop broadcasting is a basic method to disseminate vehicular safety message. In vehicular safety message broadcasting, channel reservation and channel state indication are two key problems effecting safety message transferring. In this paper, the existing channel reservation and channel state indication mechanisms are studied, the limitations to disseminate vehicular safety message are analyzed, a one-hop broadcasting protocol with busy tone reserving one hop channel and indicating one hop channel state is proposed, and the experiments are implemented with OPNET simulator. Experimental results show that, with respect to the one-hop broadcasting protocol with no channel reservation and the broadcasting protocol with two-hop channel reservation, performance of the proposed broadcasting protocol is more stable and more applicable for vehicular safety message dissemination.