KONG Ling-bin, WANG Jun-xuan
(School of Communication and Information Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China)
Abstract： An improved vertical handover algorithm for multiple networks based on Bayesian decision is proposed. Firstly, the handover probability distribution is established considering multiple conditions including signal strength, bit error rate, blocking probability and user demands, and accordingly the prior handover probability is calculated. Secondly, the posterior probability based on Bayesian decision algorithm is got. Finally, the optimal access network is selected according to the decision strategy based on posterior probability. Simulation results indicate that the proposed algorithm not only effectively achieves vertical handover among WLAN, WiMAX and LTE with the least number of handovers, but also keeps high average network load, which can provide the users with good service quality.
Key words： multiple networks; blocking probability; Bayesian decision; vertical handover
CLD number： TN911.5 Document code： A
Article ID： 1674-8042（2015）04-0347-07 doi： 10.3969/j.issn.1674-8042.2015.04.008
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基于贝叶斯决策的多网络切换算法
孔令斌， 王军选
（西安邮电大学 通信与信息工程学院， 陕西 西安 710121）
摘要:现有的垂直切换技术通常不支持多网络下切换。 为此， 提出了基于贝叶斯决策的改进算法。 首先根据接入用户终端的信号强度、 网络阻塞率和误码率以及不同用户业务对网络的实际需求建立多条件相关的切换概率分布， 得出先验切换概率； 然后利用贝叶斯垂直切换决策算法计算出后验概率； 最后， 根据后验概率的决策规则选出最优接入网络。 仿真结果表明， 该算法不仅有效地实现异构无线接入网之间的垂直切换， 避免了不必要的切换， 而且还能保持较高的网络平均负载， 使用户获得更好的服务。
关键词:网络； 网络阻塞率； 贝叶斯决策； 垂直切换
引用格式：KONG Ling-bin, WANG Jun-xuan. Handover algorithm for multiple networks based on Bayesian decision. Journal of Measurement Science and Instrumentation, 2015, 6(4)： 347-353. ［doi： 10.3969／j.issn.1674-8042.2015.04.008］
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