一种可见光和无线电混合系统的垂直切换改进算法  

Improved Vertical Handover Algorithm for the Integrated VLC-WiFi System

作　　者：邹艳芳[1] 于宏毅[1] 李青[1] 刘建辉[1] 

机构地区：[1]信息工程大学,河南郑州450001

出　　处：《信息工程大学学报》2017年第1期1-7,共7页Journal of Information Engineering University

基　　金：国家863计划资助项目(2013AA013603)

摘　　要：综合考虑了光链路脆弱易断、电链路网络容量小的特点,针对用户业务需求,提出一种基于灰色关联法的简单加权垂直切换算法。分析了室内光电混合网络链路接入时延、链路中断概率、用户速率方面的要求,确定链路切换准则,利用灰色关联法构造切换代价函数,通过光网络信噪比变化情况判断光网络中断类型优化切换驻留时间。通过对不同网络条件下数据传输平均切换时延和饱和吞吐量等性能的仿真分析,结果表明,相比于仅仅采用SNR的判决方法和光网络中断类型识别的切换判决算法,文章提出的算法能够根据各业务特点综合考虑各属性间关系,获得优良的系统性能。A VHO algorithm based on gray relation analysis and simple additive weighting is pro- posed, by taking into account vulnerability of optical link, low capacity of WiFi link and the demand of the traffic. Probability of interruption, network access delay and users demands for rate are criti- cal metrics for prejudging the system state. On this basis, gray relation analysis and simple additive weighting method are used to obtain the cost function. Through the change of the optical signal-to- noise ratio, the residence dwell time for handover is determined. The average data transmission de- lay and saturation throughput under different network conditions are simulated. The results show a good performance, compared with the algorithms which only consider signal noise ratio（SNR） and the VLC interruption type.

关 键 词：可见光 无线电 垂直切换算法 灰色关联 中断类型 网络特性 业务需求 

分 类 号：TN929.1[电子电信—通信与信息系统]