Call admission policies and capacity analysis of a multi-service CDMA personal communication system with continuous and discontinuous transmission

摘要

Capacity analysis of a multi-service CDMA communication system when both continuous and discontinuous transmission schemes are employed, is presented. Data messages treated in this paper include long ones for which closed loop power control can be implemented, and short ones for which only open loop power control is feasible. The effect of the discontinuous transmission's overhead on the system Erlang capacity is evaluated. For data transmission, when a negative-acknowledgment ARQ protocol is employed, its impact on the call admission control (CAC) is also investigated. The concept of equivalent bandwidth has been introduced which makes the analysis of an interference-limited system similar to that of a bandwidth-limited system without fixed channel assignment. The proposed CAC algorithms can be employed in a system supporting multi-rate data services. Simulations are conducted to validate the analysis.