Distributed cache updating for the dynamic source routing protocol pdf

The algorithm does not use any ad hoc parameters, thus making route caches fully adaptive to topology changes.We show that the algorithm outperforms DSR with path caches and with Link-Max Life, an adaptive timeout mechanism for link caches.Proactive protocols attempt to maintain up-to-date routing information to all nodes by periodically disseminating topology updates throughout the network.On-demand protocols attempt to discover a route only when a node originates a packet.Each node maintains in its cache table the information necessary for cache updates.When a link failure is detected, the algorithm notifies all reachable nodes that have cached the link in a distributed manner.

Routing protocols can be classified into two major types: proactive and on-demand.On demand routing protocols use route caches to make routing decisions.Due to mobility, cached routes easily become stale.To address the cache staleness issue, prior work in DSR used heuristics with ad hoc parameters to predict the lifetime of a link or a route.

However, heuristics cannot accurately predict timeouts because topology changes are unpredictable.To reduce the overhead and the latency of initiating a route discovery for each packet, on-demand routing protocols use route caches.

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