Multipath Routing Protocol Based On QoS In Ad Hoc Networks

A mobile ad hoc network (MANET) is a collection of mobile nodes without any base station or infrastructure support. Mobile nodes communicate with other nodes directly within a wireless coverage, otherwise they communicate via multi-hop routes. Because ad hoc networks can be easily deployed, they have been applied in many successful fields such as military, disaster recovery, conference et al.In ad hoc networks, however, many protocols are not flexible enough to cope with the dynamics of network environment, thus it will prevent performance optimization. Majority of routing protocols considering energy efficiency as the main objective can not assure QoS requirements. In order to save energy and ensure QoS assurance, the information of data link layer must be added to design a route protocol. So, a new multi-path protocol called QoS support AOMDV protocol based on cross layer design in Ad Hoc network (QoS-AOMDV)is proposed which is based on energy saving and the shortest queue length of buffer in data link layer. It cooperate the information of the network layer with that of data link layer to make a general criterion on route selection. By using the technology of buffer and timing, it saves the RREQs arriving at the destinations. When the timer is expired, it builds multiple paths on the criterion of general function. The performance is compared between QoS-AOMDV and AOMDV by NS2. It is shown that QoS-AOMDV is able to decrease the end to end delay significantly in heavy traffic loads. It is also shown that the network throughput increase no less than 13.8% and the network lifetime increase about 15% with the increase of packet rate.