基于非合作博弈论的异构网络选择算法

Selection Algorithm of Heterogeneous Networks Based on Non-Cooperative Game Theory

下一代异构无线网络中,垂直切换是保证系统性能的重要手段,切换执行前的网络选择更是研究的重中之重.针对现有异构网络选择算法仅从用户或网络角度考虑,且阻塞率和掉话率较高的问题,文中提出了一种基于非合作博弈的异构网络选择算法,通过综合考虑用户偏好、业务价格和准入代价得到最佳的网络选择方案.该算法从一种新的角度定义网络选择,通过网络间的博弈对用户请求进行分配.仿真结果表明,基于非合作博弈的异构网络选择算法既能获得更低的阻塞率、掉话率,又能实现负载均衡,从而更充分地利用异构网络资源,为更多的用户服务.

In next generation heterogeneous wireless networks, vertical handoff plays an important role in guaran- teeing system performance, and the network selection before vertical handoff execution is a key problem. As the existing algorithms cannot make users and networks satisfied simultaneously and possess high call blocking rate and call drop rate, a non-cooperative game theory-based selection algorithm of heterogeneous networks is proposed, which obtains the best network selection scheme by taking into account user preferences, business prices and access costs. This algorithm implements network selection from a new perspective, and allocates users＇ requests through the game among member networks. Simulated results show that the proposed algorithm helps not only obtain lower blo-cking rate and call drop rate but also achieve load balancing, so that it can fully utilize network resources to serve more users.