An adaptive distance-based mobility management method using cell code and selective paging

Abstract

Due to scarce radio bandwidth, efficient mobility management method is necessary for the PCS. This paper presents a new mobility management method for the PCS networks. It consists of three parts: cell coding scheme, location update strategy and paging strategy. The cell code scheme, which provides information about the topology of the network to mobile terminals, is the basis for the location update strategy in this paper. The location update strategy is a simplified derivative of distance-based scheme. An adaptive distance threshold is obtained by exploiting the mobile terminal’s individual call and mobility pattern. Since the location update strategy is not designed for certain mobility model such as random walk or fluid flow model, the computation of distance threshold is not only simplified but also better matches the real moving behavior of different mobile terminals. The paging strategy in this method is two-step. The moving direction vector is introduced here to optimize the paging procedure. Two-step paging will significantly reduce the signaling cost for paging. And it can be easily generalized to multi-step paging within the call setup delay constraint. A numerical analysis between mobile terminals with various moving and call patterns is provided. The mobility management method helps optimize the location update cost for all kinds of users.