A Game Theory-based Fairness 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, we gain the accept probability of the new users by using Cobb- Douglas utility function to construct a price function, then we can get a Nash equilibrium point by using the accepting probability as the payoffs of a game. The fairness of resource utilization in different load situations is achieved by satisfying the concept of Nash equilibrium point. The analysis and simulation results show that, by using this game strategy, the fairness of resource utilization is well achieved, and it is quantified by the fairness factor of F.