Service Specific Call Admission Control in WCDMA System

Abstract: When a new call arrives, the system has to determine whether to accept the call or not. These admission decisions are performed by call admission control (CAC). CAC belongs to the resource management category and is widely being investigated in many other researches as well. However, researches on CAC have mostly focused on channel allocation in the traditional FDMA and TDMA systems. We focus on WCDMA system, which has no fixed channel capacity. In this study, a new CAC scheme for WCDMA system is proposed. It also contains CDMA capacity evaluation and code assignment problem. The proposed scheme consists of handoff and new call admission controls. For each service class, handoff and new call admission controls are considered with different priorities. The handoff call admission control process precedes that of the new call¡¯s admission control process. Finally, we evaluate the performance of the proposed scheme by using the Markov analysis. The performance measures that we focus on are the blocking probabilities of handoff and new calls and the dropping probabilities of on-going calls.