可见光通信与WiFi异构网络资源管理算法  

Resource Management Algorithm of Visible Light Communication and WiFi Heterogeneous Network

作　　者：杨立伟 贾博宇 王芳[1] 彭祥原 YANG Liwei;JIA Boyu;WANG Fang;PENG Xiangyuan(College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,China)

机构地区：[1]中国农业大学信息与电气工程学院,北京100083

出　　处：《计算机工程》2023年第3期203-210,220,共9页Computer Engineering

基　　金：国家自然科学基金(61705260)。

摘　　要：可见光通信(VLC)/WiFi异构网络实现了室内的高速通信与无线覆盖,资源管理算法是实现异构网络高效传输的关键。针对传统资源分配管理算法在大规模VLC/WiFi异构网络环境下存在系统公平性低、用户体验感差等问题,提出一种动态加权轮询(DWRR)算法。将用户资源需求量、平均请求速率及与最近接入点的距离这3个因素进行加权作为用户的初始优先级。在每轮调度结束后,对时延较大的用户做出补偿,提高时延较大用户的优先级。考虑VLC和WiFi覆盖范围的差异及用户对资源的竞争程度,定义不同区域内的用户资源优先级,使VLC覆盖范围内优先级高的用户利用VLC资源,剩余用户与VLC覆盖范围外的用户联合分配WiFi资源。仿真结果表明,与最大载干比调度、比例公平算法相比,DWRR算法保证了用户间的公平性,同时提升了系统吞吐量和用户体验。Visible Light Communication(VLC)/WiFi heterogeneous network provides high-speed communication and indoor wireless access by combining the advantages of VLC and WiFi communication.Resource management algorithm is key to achieving efficient transmission in heterogeneous networks.However,traditional resource allocation and management algorithms suffer from low system fairness and poor user experience in large-scale heterogeneous network environments.To address these problems,this study proposes a Dynamic Weighted Round-Robin(DWRR)algorithm.The algorithm weights the user’s resorce demand,average request rate,and the distance to the nearest access point as the initial priority of the user.It compensates users with more significant latency at the end of each scheduling round,thereby dramatically improving the user’s priority with more extensive latency.Moreover,the algorithm examines the discrepancy between VLC and WiFi coverage and the level of resource competitiveness among users.It introduces the concept of user resource priority in various areas,allowing users with high priority under VLC coverage to utilize VLC resources and the remaining users to allocate WiFi resources with users out of the VLC coverage.Simulations show that,compared with the Maximum Carrier-to-Interference Ratio(Max C/I)and Proportional Fairness(PF)algorithms,the proposed DWRR algorithm ensures fairness among users and improves system throughput and user experience.

关 键 词：可见光通信 资源分配 动态加权轮询算法 异构网络 公平性 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]