Optimum reserved resource allocation scheme for handoff in CDMA cellular system

CDMA cellular systems support two types of handoff: soft handoff and hard h andoff. Soft handoff has many advantages over hard handoff. Qualitatively, this feature provides more reliable handoff between base stations as a mobi le moves from one cell to the adjacent one. Quantitatively, it considerably increases both the capacity of a heavily loaded multicellular system and t he coverage of each individual cell in a lightly loaded system. In this pap er, in order to increase the probability of soft handoff at the time of han doff, optimum reserved resource allocation scheme for handoff in CDMA cellu lar system is proposed, which allocates reserved resource to each frequency channel according to the number of neighbor cells using the same frequency channel. Performance analysis results show that the proposed scheme has hi gher probability of soft handoff at the time of handoff and higher total ca ll processing performance which is a function of both new calls accepted pr obability and soft handoff probability than the conventional scheme allocat ing reserved resource irrelevantly to frequency channels being used by neig hbor cells, (C) 2000 Elsevier Science B.V. All rights reserved.