一种基于局部连通性的增强型车载网多跳广播协议

An enhanced local connectivity-based multi-hop broadcast protocol for VANETs

在车载网中,许多应用都依赖于可靠高效的消息广播。由于无线信道共享介质的特性,消息广播不得不面临广播风暴问题。概率广播是一类能抑制广播风暴的简单有效的方法,然而车载网中除DV-CAST以外的概率广播协议均未考虑稀疏节点场景下的网络分割问题。在分析和验证DV-CAST协议固有缺点的基础上,借鉴其利用局部连通性进行转发决策的思想,提出了一种基于局部连通性的增强型多跳广播协议。实验表明,提出的协议能在稠密节点及稀疏节点场景中均取得较好的可靠性并具有较低开销。

Many applications in VANETs rely on reliable and efficient broadcast while broadcast has to face the so called broadcast storm problem due to the shared medium characteristic of radio channels. Probabilistic broadcast is a simple and effective way to suppress broadcast storm. However, all the existing probabilistic broadcast protocols for VANETs, except the DV-CAST, do not take the network division problem in low traffic density into consideration. On the basis of demonstrating the inherent shortcomings of DV-CAST and taking its idea of handling broadcast with local connectivity, we design and implement an enhanced local connectivity-based broadcast protocol. Simulation results show that the new protocol can achieve better reliability with lower overhead in both dense and sparse traffic scenarios.