Performance Analysis of a DS-CDMA Cellular System with Cell Splitting into Macrocell and Microcell Architecture

Shigenobu SASAKI
Hisakazu KIKUCHI
Yoshikuni ONOZATO

IEICE TRANSACTIONS on Communications   Vol.E86-B    No.6    pp.1967-1977
Publication Date: 2003/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Terrestrial Radio Communications
system capacity,  outage probability,  capacity plane,  code division multiple access (CDMA),  macrocell and microcell,  

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The demand for wireless mobile communications has grown at a very high rate, recently. In order to solve the non-uniform traffic rates, the use of cell splits is unavoidable for balancing the traffic rate and maximizing total system capacity. For cell planning, a DS-CDMA cellular system can be comprise of different cell sizes because of different demands and population density of the service area. In this paper, we develop a general model to study the forward link capacity and outage probability of a DS-CDMA cellular system with mixed cell sizes. The analysis of outage probability is carried out using the log-normal approximation. When a macrocell is split into the three microcells, as an example, we calculate the multi-cross interferences between macrocells and microcells, and the forward link capacities for the microcells and the neighboring macrocells. The maximum allowable capacity plane for macrocell and microcell is also investigated. The numerical results and discussions with previous published results of reverse link are summarized.