On Maintaining Multimedia Session´s Quality in CDMA Cellular Networks Using a Rate Adaptive Framework

In T. Kwon et al. (2003) the authors have developed call admission control and adaptive bandwidth allocation schemes for serving multimedia connections in cellular wireless networks with fixed cell capacity. The architecture considers an adaptive networking framework where the bandwidth of multimedia calls can be dynamically adjusted, and the proposed admission method works by enforcing an upper bound on the cell overload probability. In this paper we consider a similar adaptive framework, and devise call admission control and bandwidth allocation strategies to serve multimedia connections in a CDMA-based 3G cellular network. The architecture aims at maintaining the session´s quality during both intra-cell and inter-cell user movements by limiting the cell overload probability. A novel aspect of our work is a method for exploiting a priori knowledge of user mobility patterns to estimate the cell overload probability after some prescribed prediction interval. Important properties of the devised method are proved analytically. Compared to a non-predictive admission control scheme, the obtained results show that the proposed scheme achieves a lower forced termination probability, and higher throughput while consuming less base station transmission energy