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An important technique for discovering routes between two nodes in an ad-hoc network involves applying the face routing algorithm on a planar spanner of the network. Face routing guarantees message delivery in networks that contains large holes, where greedy algorithms fail. Existing techniques for constructing a suitable planar subgraph involve local tests that eliminate crossings between existing...
In WiMAX/IEEE 802.16 with mobility support, scanning for an available channel by a mobile station, especially during a handover, must be done promptly in order to reduce delays in network access. We have shown previously that mobile stations can reduce scanning times by maintaining a most probable list of frequencies in use. In this paper, we extend this idea to further capture the mobility patterns...
We focus on the interference between mobile stations as they attempt to gain access to an OFDMA-based WiMAX/IEEE 802.16 network. We propose a set of strategies that enable base stations to 1) reduce or eliminate the interference between emergency and non-emergency mobile stations and 2) provide prioritized access to emergency mobile stations. Our strategies include introducing a sliding contention...
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