Abstract
Call admission control (CAC) in multimedia wireless communications is to guarantee quality of service (QoS) to mobile users and to achieve a high resource utilization efficiency. It is a challenging issue due to user mobility, limited radio spectrum, heterogeneous nature of multimedia traffic. This paper proposes a CAC policy for a wireless system supporting both constant-rate voice calls and available-rate data calls. The parameters of the proposed policy is determined in a systematic way by using an optimization approach. Soft QoS (relaxed target QoS) is introduced to make a compromise between the QoS levels of the voice and data calls, respectively, in a heavy traffic load situation. Numerical results show that the proposed CAC policy can guarantee the QoS of all the users under most traffic conditions considered.
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