针对移动主机在垂直切换过程中无线资源的合理分配问题,基于通用移动通信系统(UMTS)和无线局域网(WLAN)构建的无线异构网络环境,按照不同业务的服务质量(QoS)优先级,提出一种联合带宽借用、负载均衡机制的新型垂直切换算法;建立基于Matlab的性能评估仿真平台,对新呼阻塞率、掉话率进行分析.结果表明,该算法可以在维持较小阻塞率的情况下,有效减少掉话率,保证QoS需求高的话音业务取得很好的服务质量.
In this paper, we propose an improved vertical handoff algorithm joint radio resource management technologies (VHO-J) for wireless heterogeneous networks. The proposed algorithm is combined with access control, bandwidth borrowing and compensation, and load balance control to allocate radio resource based on different traffic types in process of vertical handoff. The results of simulations indicate that the VHO-J is able to reduce the dropping probability under the same block probability, and guarantee the best quality of service for voice in the four traffic types.