一种基于可靠最远转发的车载网广播协议

A Reliable Most Forward within Radius Scheme Based Broadcast Protocol for Vehicular Ad-hoc Networks

许多车载自组网应用依赖于可靠高效的广播,但车载自组网节点高速移动,网络连通性随场景和时间动态变化的特性给广播协议的设计带来巨大挑战。为了应对这种挑战,该文在分析和验证简单最远转发机制具有低可靠性的同时,提出一种基于广播方向的可靠最远转发策略,并结合捎带确认机制设计了一种新的自组网多跳广播协议。与简单最远转发相比,可靠最远转发能明显降低转发节点失效的概率,提高消息单跳传播的可靠性;捎带确认机制使得协议能够适应网络连通性较差的场景,提升了消息全网传播的可靠性。仿真结果表明,提出的协议能在各种场景中实现高可靠性、低冗余的广播。

Many applications in Vehicular Ad-hoc NETworks（VANETs） rely on reliable and efficient broadcast, however, the characters that nodes move quickly and connectivity changes with scenario and time will pose a huge challenge to broadcast protocol designing of VANETs. To cope with the challenge, a broadcast direction based reliable most forward within radius scheme is proposed on the basis of analyzing and verifying that simple most forward within radius scheme has poor reliability. Then, combined with piggybacked acknowledgement mechanism, a new multi-hop broadcast protocol is designed. Compared with simple most forward within radius, reliable most forward within radius can significantly reduce failure rate of relay nodes and improve the single-hop propagation reliability; piggybacked acknowledgement enables the protocol to adapt to poor connectivity scenarios and enhances the reliability of messages spreading though the whole network. The simulation results show that the proposed protocol can achieve high reliability and low redundancy broadcasts.