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Recent advances in network and computer technologies have led to the development of the mobile computing environment. In this environment, the location management is one of the most important issues. In this paper, for reducing the traffic volume of the location management, we propose a hierarchzcal location management method. This method divides a network into multiple groups (areas) where each area has a t least one router. T h e locations of mobile hosts in an area are managed within the area, independently from those in other areas. Furthermore, the most suitable location management method for an area is used in this area. We also show results of simulation experiments for verifying the efficiency of the method. These results show that our proposed method can reduce the traffic volume of the location management.

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In mobile computing environments, the location of each mobile host should be managed by the networking system to realize communication among mobile hosts. Thus, traffic is caused not only by the communication but also by the location management. In this paper, we propose a location management method for improving the mobile communication throughput based on grouping of touters. First, this method divides the routers in a fixed network into multiple groups. Then, the routers in each group manage the location information independently of other groups by choosing a location management strategy from several conventional strategies. We show the results of our simulation experiments to compare the traffic volume of our method and Mobile-IP. The results show that our method can greatly reduce the traffic volume compared with Mobile-IP. We also discuss the communication overhead of our method and show that our method can be practically used in the real environment. Moreover, we address some problems of our method and show possible extensions to solve them.