Hybrid call admission control scheme supporting voice/video/packet data services with W-CDMA downlink power allocations

A call admission control (CAC) procedure, called the hybrid scheme, is proposed to enhance the QoS (quality of service) of attempted calls. In the initial stage of 3^rd generation wireless service networks, major limitations may include the small service coverage area and the limited radio link capacity. Thus, the QoS of multiple services is expected to be severely degraded if tentative traffic hot spots occur frequently. The blocking probability (QoS) of attempted calls may increase when a relatively large number of users tries to place multimedia calls in a hot spot area of the service network. In this situation, the proposed hybrid scheme can mitigate the degradation of the QoS of various services by using the available radio channels of neighbouring cells.