(A) study on mobility management schemes for future wireless communication network

Abstract

Future wireless communication network will provide integrated services such as voice, data and multimedia to personal stations (PS’s) anywhere, anytime using advanced microcellular concept. In such a network, service areas are partitioned into a number of registration areas (RA’s). Each RA consists of a group of cells, each of which is served by a base station (BS). The BS’s provide the radio links for communications, and the radio coverage of each BS is called a cell. To perform the registration and paging operations in wireless communication network, each cell in the RA must carry the signaling traffic associated with all PS’s in the RA. The registration and paging operations are called mobility management function. As the number of PS’s increases, the signaling traffic due to the mobility management significantly increases. This thesis deals with the mobility management schemes for future wireless communication network. The first part of the thesis considers the modeling and analysis of two-location algorithm with implicit registration function in CDMA personal communication network. Based on a mobility model, the distribution of the residence time of PS in RA is analytically derived, and the mean number of registrations whose validity is justified by simulation studies is also derived. In addition to, the distribution of the residence time of PS in RA is approximated with gamma distribution, where the shape and scale parameters for the gamma distribution are numerically calculated. Based on the developed models, the signaling cost under each of the three algorithms (single location algorithm, two-location algorithm and two-location algorithm with implicit registration function) is determined, and then compared with each other under various values of the call-to-mobility ratio. The second part addresses the location management scheme that combines a distance-based registration with a paging scheme subject to delay constraints. A recursive solution is provi...