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PERFORMANCE EVALUATION OF PRIORITY ACCESS PROCEDURE OVER TDMA SYSTEM

Emergency service has become an important application in telecommunications today. System resources can be shared with higher priority given to the emergency users by using a practical priority access procedure though ordinary traffic will suffer some impact. In this paper, a priority access procedure using one of three different priority access algorithms is designed based on the architecture of the Personal Access Communications System (PACS) with consideration given to hardware implementation. The system performance, including the blocking rate and dropping rate of regular calls and the successful access rate of emergency calls, has been studied using a simulation system constructed with the Block Oriented Network Simulator (BONeS). Simulation results show that the proposed priority access procedure using one of the three studied algorithms is suitable for implementation in the PACS system.