Call admission control in multi-class traffic CDMA cellular system using multiuser antenna array receiver

Abstract

We developed an admission control scheme for CDMA cellular system that supports multiple classes of traffic with different QoS requirements and incorporates adaptive power control and antenna array multiuser receiver. A relation of the cell capacity and other-cell interference level is first established via simulation. For multi-class traffic cellular system a notion of bandwidth utility is used to characterize cell capacity. The CAC scheme is then implemented distributively in each cell based on estimation of other-cell interference. The admission control decision is made by comparing capacity bandwidth utility and the sum of current bandwidth utility and new call bandwidth utility. In the simulation it is demonstrated that the CAC scheme can adapt to various traffic distribution. Capacity determined by the CAC algorithm agrees well with that given by simulation. Therefore it can achieve high bandwidth utilization while guarantee QoS requirements of all the users.