Performance of Call Admission Control with Power Control in Multimedia Cellular Systems
Young-Long Chen, Jyu‐Wei Wang, Jyh-Liang Chen, Jyh‐Horng Wen · 2007
Conventional call admission control (CAC) methods generally accept (or reject) new call arrivals on the basis of measured information such as the signal-to-interference ratio (SIR) or the total received power in the individual cells. However, this paper proposes a novel approach which combines the CAC and power control mechanisms and operates in a centralized control manner. The essence of the proposed centralized call admission control (CCAC) scheme is to combine the two mechanisms and to treat the call admission decision as an eigen-decomposition problem. In the proposed approach, a new call is accepted only if the quality-of-service (QoS) requirements of all the active links in the network can still be maintained. In order to reduce the computational complexity of the eigen-decomposition problem, the paper proposes an additional scheme which uses a norm operation rather than direct computation. The simulation results indi- cate that the proposed scheme, even with the norm approximation, outperforms conventional call admission methods both in terms of its blocking rate and its outage rate.