Performance analysis of microcellization for supporting two mobility classes in cellular wireless networks

| We study the call blocking performance obtained by microcellising a macrocell network. Each macro-cell is partitioned into microcells, and some of the channels originally allocated to the macrocell are assigned to the mi-crolayer cells according to a reuse pattern. The arriving calls are classiied as fast or slow; fast calls are always assigned only to macrocell channels, whereas for slow calls a microcell channel is rst sought. Slow calls may be allowed to overrow to the macrolayer, but may be repacked to vacated microcell channels. Calls can change their mobility class during a conversation. We develop an approximate analysis for computing the slow and fast call blocking probabilities in such a system. We adopt the technique of analysing an isolated macrocell with the Poisson arrival assumption, and then iterating on the stationary analysis of the isolated macrocell to obtain stationary results for the multicell system. Simple, but accurate approximations are developed for analysing the isolated macrocell and its associated mi-crocells. The analyses based on the approximate isolated cell model are validated against simulations of a multicell model.