Abstract:

The hierarchical mobile IP (HMIP) is efficient for reducing signaling cost and handover latency. However, since user mobility characteristics and traffic load between different cells are always changing, the preplaned hierarchical topology is likely to be invalid or even causes more signaling cost. A novel algorithm based on domain discovery and topology adaptive optimization was proposed, which can discover those cells with high handover frequency or heavy traffic load through realtime measurement and make these cells gather into the same administrative domain. In this way, the interdomain handover/traffic will change to intradomain handover/traffic. The theoretic analysis and simulation results both show that the algorithm reduces the signaling costs and handover latency and increases the throughput of mobile nodes obviously.

Key words: hierarchical mobile IP, handover, domain discovery , topology adaptive optimization