蜂窝系统使用免费频段的方法研究  

ON UNLICENSED SPECTRUM USAGE METHOD FOR CELLULAR COMMUNICATION SYSTEMS

作　　者：张宁[1,2,3,4] 徐景[1,3,4] 周斌[1,3,4] 龙颖贤[1,2,4] 彭焘[1,2,3,4] 

机构地区：[1]中国科学院上海微系统与信息技术研究所,上海200050 [2]中国科学院研究生院,北京100049 [3]上海无线通信研究中心,上海200335 [4]中国科学院无线传感网与通信重点实验室,上海200335

出　　处：《计算机应用与软件》2012年第12期90-94,共5页Computer Applications and Software

基　　金：国家重大专项(2010ZX03003-002);国家国际科技合作项目(2010DFB10410);国家国际科技合作专项项目(S2012GR0072);中国科学院科研装备研制项目(Y201004S);上海市科委基础研究重点项目(10S11502600);上海市科技人才计划项目(浦江计划)(10PJ1411900)

摘　　要：蜂窝系统使用免费频段是解决蜂窝系统频谱资源紧张的途径之一。首先阐述IEEE 802.11的MAC机制,针对蜂窝系统利用载波监听传统机制去竞争无线局域网频段存在的无法充分利用频谱资源的缺陷,提出一种基于最大化比例公平准则的自适应概率可调的动态频谱接入方法,该方法可以步进地调整蜂窝的接入概率,从而使系统工作在最大化比例公平的理想点附近,仿真结果表明该方法比传统机制在公平性和吞吐量指标上都有提升。Cellular system sharing the unlicensed spectrum is one of the approaches to release the load of the crowded cellular band. First, we express the MAC mechanism of IEEE 802. 1 1. For the limitation of cellular system that it cannot fully utilise the spectrum resource when employing traditional carrier sensing mechanism to rival WLAN band, we propose an adaptive probability access （APA） method which can adjust the channel accessing probability based on maximised proportional fairness rule. This method can adjust the cellular accessing probability step by step to ensure that the whole system works at the maximum proportional fairness. Simulation resuhs show that the proposed APA method has benefit on both the proportional fairness and total throughput than traditional mechanism.

关 键 词：蜂窝系统 共享频段 无线局域网 动态频谱接入 比例公平 

分 类 号：TN915[电子电信—通信与信息系统]