A Fault-Tolerant and Region-Based Scheme for Mobility Management

Abstract

One of the most important and challenging issues in the design of personal communication service (PCS) systems is the management of location information. In this paper, we propose a new fault-tolerant and region-based location management scheme, which is based on the cellular quorum system. Due to quorum’s salient set property, our scheme can tolerate the failures of one or more location server(s). Meanwhile, with a region-based approach, our scheme stores/retrieves the MH location information in the location servers of a quorum set of the local region as much as possible to avoid long delays caused by the possible long-distance of VLR and HLR. Thus, it yields better connection establishment delay.