WLAN与3G网络融合的接入选择算法研究

3G？WLAN混合组网不但能大幅降低运营商的网络建设和运营成本，还能有效解决数据业务热点区域3G网络的容量与需求之间的矛盾。融合网络中用户接入网络的不均衡性是影响网络性能的重要因素，针对融合网络的负载均衡问题，提出了一种基于博弈论的融合网络接入选择算法。文中给出一种面向群体用户的网络接入选择实现机制，该机制根据用户在网络中获得的效用函数，引入非协作博弈论方法建立网络效用模型，并证明该非协作博弈满足势博弈条件。仿真结果比较了网络融合环境下的各群体接入网络在非协作博弈模式中的收益特性，模拟了用户网络接入选择过程。

Access selection algorithm for the 3G-WLAN converged network

The 3G？WLAN converged network can not only reduce the cost of network construction and operation greatly, but also solve effectively the contradiction between capacity and demand of the 3G service hot spots. The imbalance of user accessing network from the converged network is one of the important factors affecting network performance. Aiming at the converged network＇s load balance problem, this paper proposes a selection algorithm for accessing converged network based on the game theory. This paper presents a group user？oriented mechanism for a？chieving access to the network. This mechanism introduces a non？cooperative game theory method to establish the network utility model according to the utility function, proving that the non？cooperative game theory meets the con？ditions of potential game. The income characteristics of different accessed networks under the non？cooperative game mode in the converged network environment are compared and the user’ s selection process in access to network is simulated.