一种基于优先级的异构无线网络切换算法  

A vertical handoff algorithm based on priority for heterogeneous wireless networks

作　　者：蒋青[1] 任行帆 张佳星[1] 

机构地区：[1]重庆邮电大学重庆市移动通信重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2014年第6期826-831,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(61071196)~~

摘　　要：无线网络对性能的要求促进了网络融合的必然性,为了解决异构无线网络切换过程中存在的问题,提出一种基于优先级的异构无线网络切换算法。该算法包含2个部分,基于业务优先级对用户进行排队,可以有效地解决群组用户同时切换所可能造成的网络拥挤。在网络判决过程中,对判决参数分层处理,分步计算和分析,可以降低传统算法中复杂度和计算量过高的问题。仿真结果表明,改进算法与传统的切换算法相比,该算法不仅能够改善网络拥挤,减少切换时延,提高切换成功率,而且可以降低切换判决过程所耗费的资源,改进后的算法能够提高用户满意度及网络性能。The demand for performance of wireless networks promotes the inevitability of network integration. In order to solve these problems in the process of heterogeneous wireless networks, a vertical handoff algorithm based on priority for heterogeneous wireless networks is proposed. The algorithm consists of two parts, and users are queued according to the pri- ority of the business, which can solve the problem that switches of group users at the same time are likely to cause network congestion. In the process of the network decision, hierarchical processing for judgment parameters, calculation and analy- sis step by step, can reduce the problem of high complexity and computation in the traditional algorithm. Simulation results show that the improved algorithm not only improves the network congestion, reduces switch delay, increases the success rate, but also can reduce the amount of resources in the process of switching decision. Overall, the improved algorithm can improve the customer satisfaction and network performance.

关 键 词：异构无线网络 切换 优先级 模糊逻辑 

分 类 号：TN919[电子电信—通信与信息系统]