The redundant cache: An enhancement of cache mechanism in DSR

One of the critical challenges in the design of the mobile ad hoc networks (MANET) is the development of efficient routing protocols, among which Dynamic Source Routing (DSR) is a representative and prevailing one. Caches are extensively used in DSR to keep the routing paths for current and future use. All the available paths are collected after the route-discovery process and cached as candidate routes towards certain destinations. Also, intermediate hosts can reply to a RREQ (route request) if they have cached proper paths to the wanted node, which reduces the end-to-end delay. In this paper, we enhance the current cache-storage mechanism by attaching some redundant information to the cached paths. This information helps to make a quicker response to some RREQs and thus can reduce the average end-to-end latency further. The simulation results have proven the validity of redundant cache in reducing the average end-to-end delay and overall overhead.