Joint Rate-adaptive and Backoff Waiting Call Admission Control for Differentiated Services in CDMA Cellular Networks
Resource allocation and call admission control (CAC) are key management functions in future cellular networks, in order to provide multimedia applications to mobiles users with quality of service (QoS) guarantees and efficient resource utilization. This paper proposes a novel call admission control for multi-services CDMA cellular network, which consider the capacity in the condition of non-ideal power control and work in conjunction with rate adaptation and backoff waiting schemes. The backoff algorithm, in which the rejected calls choose the backoff delay randomly and wait for another access opportunity, decreases the blocking probability effectively. Also, rate adaptation strategy, using dual classification for services and users, not only maintains the fairness of users, but also guarantees the smooth degradation of quality of service (QoS). Simulation results have demonstrated that the proposed adaptive CAC scheme guarantees the QoS of different traffic efficiently, and improve the resource utility significantly.