基于链路生存时间的AOMDV协议的研究

RESEARCH ON LINK EXPIRATION TIME-BASED AOMDV ROUTING PROTOCOL

针对AOMDV路由协议中,以跳数作为路径选择标准不能提供足够稳定的链路,使得路由的整体开销较大的问题,提出基于链路生存时间的AOMDV协议(LET-AOMDV)。该协议中每个节点通过GPS获取移动的速度和方向,计算链路持续时间,同时根据牛顿插值公式估算出节点剩余能量所能使用的时间,选择路由有效时间最长的路径,从而提高链路的稳定性。NS2仿真结果表明,与AOMDV协议及MP-AOMDV协议相比,采用LET-AOMDV协议能够减少路由请求次数,降低路由开销,减少时延,同时增加网络的吞吐率。

In AOMDV routing protocol, taking the number of hops as the selection criteria of routing path cannot provide the link with sufficient stability, which makes the overall cost of the route increase. To solve this problem, we propose a new AOMDV routing protocol which is based on link expiration time. Each node in the protocol obtains its speed and direction of movement through GPS, calculates the duration of link, and meanwhile estimates the remained time for residual energy of itself with Newton＇s interpolation formula, then selects the path with longest effective routing time so as to improve the stability of the link. NS2 simulation results show that compared with AOMDV protocol and MP-AOMDV protocol, to use LET-AOMDV protocol can decrease the number of routing requests, reduce the routing overhead, shorten the latency and increase the network throughput at the same time.