异构网络中基于用户QoS的网络选择算法研究

Research on Network Selection Algorithm Based on QoS in Heterogeneous Wireless Networks

异构无线网络资源管理中最重要的是网络选择过程。传统的网络选择算法,有时会造成某些网络的拥塞和某些网络资源的浪费。针对这个问题,研究一种网络选择算法,在效用函数中考虑用户业务的Qo S等级,然后根据效用值为用户提供适当的接入网络。不同的业务类型及用户的Qo S需求是很重要的,不是所有的网络都可以满足用户需求。仿真结果表明,该算法可以提高实时性要求较高的用户满意度,并使不同网络之间可以得到资源的有效利用和负载均衡。

The most important functions within the Common Radio Resource Management （CRRM） is the network selection procedure. Some traditional network selection algorithms will lead to network congestion or resource underutilized. In view of this, research a QoS- based network selection algorithm,in which a utility value is assigned to the associated RATs considering the QoS level of user transac- tion. QoS demands of different traffic types is very important. Not all of the network can meet user needs. The simulation results demon- strate the algorithm can improve the higher real-time requirements of customer satisfaction, and can make resources used effectively and load balancing between different network.