A New Incremental Rerouting for Handoff in Wireless ATM Networks

Whenever a handoff occurs in wireless ATM network, the connection for mobile user must be reestablished in the new area. This paper proposes a new path re-routing scheme based on the incremental re-establishment approach, which decides the crossover node by comparing the distances between each node in the existing path and the new location, while traversing the path backward. This scheme allows us to efficiently decide a new path close to the shortest path. In order to realistically evaluate and compare the proposed scheme, we model the distance a mobile user makes for the given mobile speed and call duration statistics and propose a new approach for generating realistic random network. Comprehensive computer simulation for various random networks shows that the proposed scheme outperforms previous schemes in terms of path efficiency and handoff delay. We also obtain path reuse efficiency of more than 80%. The proposed scheme can be implemented by making use of the information in the routing table in the existing network structure.