Optimal threshold configuration with equality based call admission control with cooperative users (mixed loss and delay system)

We have proposed a method of call admission control (CAC) to maximize total user satisfaction in a heterogeneous traffic network and discussed its effectiveness by using an optimal-threshold from numerical analyses. This CAC method assumed that there would only be selfish users in a network. However, we need to consider the possibility that there will be some cooperative users who agree to reduce their requested bandwidth to improve another user´s QoS. Thus, the CAC may not be optimal if there are cooperative users in the network. In this paper, we propose a method of CAC that is designed to take into account cooperative users by using queueing theory. Moreover, we show the characteristics of an optimal threshold when the ratio of cooperative users varies.