车载网络中基于混合地理路由协议

A novel hybrid geographic routing protocol in VANETs

车载网络(VANETs)中的多跳转发仍是一项挑战工作。现存的路由协议以高数据包传递率或以低时延为目的。为此,提出基于发送和接收节点的混合地理路由协议(SRHGR)。SRHGR协议结合了基于发送节点和接收节点转发节点的选择特性,首先利用Beacon包建立一跳邻居集,再通过距离建立候选转发节点,然后利用节点距离因子和相对速度因子计算节点的权重,最后依据权重设置节点转发消息的时延,进而选择最优的转发节点。仿真结果表明,提出的SRHGR协议既降低了传输时延,又提高了数据包传递率。

The multi-hop forwarding remains a challenging task in vehicle Ad Hoc networks(VANETs).The available routing protocol either focus on the high packet transmission ratio or low latency.Therefore,a sender-receiver based hybrid geographic routing(SRHGR)protocol is proposed in this paper,in which the selection feature of sending node,receiving node and forwarding node is combined.The beacon packet is used in SRHGR protocol to construct one-hop neighbor set,and then the candidate forwarding node is established according to the node distance.The node distance factor and relative speed factor are adopted to calculate the weight of the node.The delay of node forwarding message is set according to its weight,so as to select the optimal forwarding node.The simulation results show that the proposed SRHGR protocol can reduce the transmission delay,and also improve the data packet transmission ratio.