车载自组织网络中基于定向传播的自适应路由协议

Adaptive Routing Protocol Based on Directional Transmission in VANETs

数据分组在转发过程中需要在其转发范围内寻找一个中继节点进行转发。为了降低转发过程中寻找中继节点的复杂程度,减少从源节点到达目的节点的平均跳数,提出了一种车载自组织网络中基于定向传播的自适应路由协议(Adaptive Routing Protocol Based on Directional Transmission,ARPBDT)。该路由协议有两个关键参数:转发角度和平均每跳前进距离。首先为了缩小转发范围,设置一个始终朝着目的节点方向的转发角度,以减少转发范围内的节点数以及寻找中继节点的计算量;其次为了减少平均跳数,在转发范围内根据前进距离自适应地选择较优或次优的邻居节点作为中继节点进行转发。仿真结果表明,与OBDR相比,所提路由协议的平均跳数较少,平均每跳前进距离较大,能够使数据分组快速地到达目的节点。

The relay node needs to be found in the range of forwarding when packets data is forwarded.In order to reduce the complexity of searching relay nodes and the average number of hops from source node to destination node in the process of forwarding,an adaptive routing protocol based on directional transmission in vehicular ad hoc networks was proposed.Forwarding angle and the average distance of one-hop progress are the two key parameters of the routing protocol.Firstly,in order to reduce the forwarding range,a forwarding angle always to awards the destination node is designed,which can reduce the number of nodes in the forwarding range and simplify the calculation of searching relay nodes.And then,in order to reduce the average number of hops,optimal or sub-optimal neighbor nodes are chosen adaptively as relay node based on the distance of progress in the forwarding range.Simulation results show that compared with the OBDR,the proposed adaptive routing protocol is superior in terms of both the average number of hops and the average distance of one-hop progress,with which the data packets can be transmitted quickly to the destination node.