LTE系统中femtocell的动态频谱接入方法  

Dynamic spectrum access method for femtocells in LTE

作　　者：左旭舟[1] 夏玮玮[1] 沈连丰[1] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2015年第1期111-120,共10页Journal on Communications

基　　金：国家科技重大专项基金资助项目(2011ZX03005-004-03);国家自然科学基金资助项目(61171081;61201175);东南大学移动通信国家重点实验室自主研究课题基金资助项目(2013A03)~~

摘　　要：针对LTE系统中femtocell的通信需求,给出一种基于认知无线电技术的动态频谱接入方案,提出一种上行频谱的感知方法,femtocell可发现周围被macrocell用户占用的频谱,还能进一步对这些频谱承载的业务类型进行识别,并根据不同的业务类型,选择不同的接入方法。如果femtocell检测到一段频谱承载的是话音业务,femtocell采用跳频的方法接入这段频谱;如果承载的是数据业务,femtocell就采用功率控制的方法接入频谱。仿真结果表明,该方法使femtocell实现对周围频谱承载业务的智能化识别和接入,从而在满足macrocell用户不同业务类型信干噪比要求的前提下,提高了femtocell小区的吞吐量。Dynamic spectrum access method for femtocells in LTE using cognitive radio method to meet the communication requestions was investigated. An uplink sensing method was proposed. By this method, femtocells could not only identify occupied spectrums but also identify service categories of those spectrums. A dynamic spectrum assess method of power control and frequency hopping for femtocells that ensured a low pre-definable performance impact to macro users was proposed. The femtocell could adopt power control to access the spectrum that carried data service while adopt frequency hopping to access the spectrum that carried voice service. Simulation results show that the downlink throughput of the femtocell can be significantly increased by using proposed spectrum access method.

关 键 词：LTE FEMTOCELL 频谱感知 业务识别 跳频 功率控制 

分 类 号：TN914[电子电信—通信与信息系统]