An efficient call admission control scheme for heterogeneous services in wireless ATM networks

An efficient call admission control (CAC) scheme for handling heterogeneous services in wireless ATM networks is proposed. Quality-of-service (QoS) provisioning of jitter bounds for constant bit rate (CBR) traffic and delay bounds for variable bit rate (VBR) traffic is used in the CAC scheme to guarantee predefined QoS levels to all traffic classes. To reduce the forced handoff call dropping rate, the CAC scheme gives handoff calls a higher priority than new calls by reserving an appropriate amount of resources for the potential handoff calls. Resource reservation in the CAC scheme makes use of the user mobility information to ensure efficient resource utilization. Simulation results show that the proposed CAC scheme can achieve both low handoff dropping rate and high resource utilization.