摘要
在异构无线网络中,针对终端不同类型的应用在服务质量(QoS)需求上的差异,该文提出一种面向终端个性化服务的模糊垂直切换算法。该算法从以下两个方面提高切换性能:首先在网络发现阶段,通过预测候选网络在切换时刻的负载状态,对候选网络进行筛选;然后在切换判决阶段,根据每类应用对QoS参数的不同需求范围设计不同的隶属度函数。仿真结果表明,该算法能有效降低切换阻塞率,提高系统吞吐量,并能根据终端的应用类型合理地选择切换网络,满足了终端的个性化服务需求。
Considering the differences in Quality of Service （QoS） requirements of different application classes in heterogeneous wireless networks, this paper proposes an individualization service oriented fuzzy vertical handover algorithm. The handover performance is improved from the following two aspects. Firstly, in the network discovery phase, the candidate networks are sifted by predicting the network loads in handover execution. Secondly, in the handover decision phase, different membership functions are designed according to the different QoS requirements of each application class. The simulation results show that the proposed algorithm can reduce the blocking probability, improve the system throughput, select the target network reasonably, and meet the QoS requirements of terminal individualization service.
出处
《电子与信息学报》
EI
CSCD
北大核心
2017年第6期1284-1290,共7页
Journal of Electronics & Information Technology
基金
国家自然科学基金(61271259
61301123
61471076)
重庆市基础与前沿研究计划(cstc2015jcyj A40047)
重庆邮电大学博士启动基金(A2014-10
A2015-16)~~
关键词
异构无线网络
垂直切换
网络负载预测
隶属度函数
Heterogeneous wireless networks
Vertical handover
Network loads prediction
Membership function
