Abstract

We present a self-stabilizing optimal (in terms of the distance) local routing algorithm (𝒮𝒪ℒℛ) for a wireless mobile ad hoc network. The distance may represent various metrics, including the real distance and the number of hops. The optimal routing for any node is computed for t closest nodes (called t -set) where t is an application-dependent parameter and is decided in advance. The locality is defined with respect to the t -set, not with respect to the direct neighbours. Our protocol is a particular case of distance vector routing protocol, where the number of entries in the routing table is limited to t . A self-stabilizing system has the ability to automatically recover to normal behaviour in case of transient faults without a centralized control. Each node can start in some arbitrary state and with no knowledge of the network architecture, but still eventually computes a correct routing table for the nodes in its t -set. If we assume that the t -set represents the set of destinations for which the shortest path needs to be computed, 𝒮𝒪ℒℛ becomes an optimal on-demand routing protocol. It can be extended to a global routing protocol by using features specific to other protocols (e.g. hierarchical routing, cluster routing, interval routing, etc.).

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