A Pricing and Game Theory-Based Call Admission Control Scheme for CDMA Systems

Call admission control (CAC) is one of the most important parts in radio resource management of CDMA networks, and it has an important effect on the quality of service (QoS). The most concern of traditional CAC strategies is to harmonize the blocking probability and dropping probability, so as to maximize the resource utility. With the development of radio network, not only resource utility is the emphasis of CAC but also fairness is becoming important. In the multimedia CDMA networks, once the high load stream traffic is admitted, it will over-use the resource greedily, which will cause the unfair use of the resource to other kinds of traffic. In this paper, by using Cobb-Douglas utility function to construct a price function, we achieve the fairness of resource utilization in different load condition. Since video and IPTV can tolerate a certain degree of packet lose rate and the data can tolerate a certain degree of delay, so we use a game to decide whether to degrade ongoing users (i.e., discard some packets of video or IPTV, or stop the service of data) or to reject the new user in order to maximize the resource utility in the precondition of fairness of resource utilization. The analysis and simulation results show that, by using this pricing function and game approach, the fairness of resource utilization is well achieved, while the resource utilization is maximized.