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A Study on Call Admission Control Scheme based on Multiple Thresholds in the CDMA System  

Piao, Shi-Gwon (영남대학교 정보통신공학과)
Park, Yong-Wan (영남대학교 정보통신공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.3A, 2003 , pp. 129-139 More about this Journal
Abstract
CAC is a very important issue in CDMA system in order to protect the required QoS(quality of service) and increase the system's capacity. In this paper, we proposed and analyzed a call admission control scheme using multiple thresholds, which can provide quick processing time and better performance. There are two effective thresholds used to decide call admission. One is the number of active users, and the other is the signal to interference ratio(SIR). If the threshold of active users are lower than the low number of users threshold, we accept the new call without any other conditions. Otherwise, we check the current SIR to guarantee the quality of our service. System then accepts the new call when the SIR satisfies system requirement. Otherwise, the call will be rejected. Multiple threshold schemes are investigated and their performance is compared with the number of user and power based CAC's. simulation results are provided to evaluate the performance.
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