Improving QoS of Mobile Ad-hoc Network Using Cache Update Scheme in Dynamic Source Routing Protocol

The route caching plays significant role in on-demand routing protocol to improve the Quality of Service (QoS). QoS is very essential for various applications of MANET. Route discovery phase is used in on-demand protocol. To avoid route discovery scheme route caching strategy is used. Frequently use of route discovery is very cost effective solution in terms of QoS parameters. Hence, in this paper we have proposed new approach for cache updating using distributed route cache update algorithm. In conventional approach only the nodes involved in the routing path knows about the route error and those node only update their cache. But in U-DSR, by following distributed cache replacement algorithm, source node broadcasts the route error information of size 60 bytes to all its neighbours. Hence all neighbours replace the stale route in their cache. Experimental evaluation is done using network simulator (NS2) of monarch group. The proposed approach improves the performance up to 30%-40% using different QoS parameters like Packet Delivery Ratio (PDR), end to end delay, packet drop and energy consumption.