Optimized call admission control in wireless networks
Shengdong Xie, Meng Wu · 2008
Traditional traffic rate regulation/degradation schemes in call admission control (CAC) seldom take rate degradation optimization into consideration, thus can not obtain the perfect grade of service (GoS) in session layer. In this paper, we propose an enhanced rate degradation CAC (ERDCAC) scheme in multimedia wireless networks, which is an extension and optimization of the rate regulation CAC scheme. We introduce a variable which is a degradation threshold for wide-band traffic (WB) when new narrow-band (NB) connection arrives, and can be adjusted at the start of every monitor period. We develop a Markov model to analyze the ERDCAC, and design a cost function to evaluate its performance. From the result of Markov model analysis, along with the measurements of call arrival rates of all traffics, the threshold variable to acquire the best GoS is obtained. Extensive numeric results illustrate the effectiveness of the ERDCAC compared with traditional rate regulation CAC scheme which is a non-optimization rate degradation scheme.