UE速度和CQI时延对LTE/LTE-A系统效率的影响  

Influence of UE Speed and CQI Delay on Efficiency of LTE/LTE-A System

作　　者：陈发堂[1] 高奇[1] 

机构地区：[1]重庆邮电大学重庆市移动通信技术重点实验室,四川重庆400065

出　　处：《自动化仪表》2016年第6期21-23,27,共4页Process Automation Instrumentation

基　　金：国家科技重大专项基金资助项目(编号:2011ZX03001-002);国家科技重大专项基金资助项目(编号:2012ZX03001009-004);国家科技重大专项基金资助项目(编号:2012ZX03001024)

摘　　要：针对无线信道复杂的时变特性,采用自适应调制编码(AMC)技术进行下行资源的调度,以提高LTE/LTE-A系统的可靠性和系统性能。AMC技术的关键是网络端使用终端反馈的实时信道质量指示(CQI)进行下行调度,但现有LTE/LTE-A系统中,为了简化系统设计,大多并未考虑CQI时延带来的影响。因此,建立LTE/LTE-A系统模型,并结合WINNER II信道模型,对不同信道环境下CQI时延和用户设备(UE)速度对LTE/LTE-A系统的影响进行仿真分析。分析结果表明,LTE/LTE-A系统的效率随着终端速度和CQI时延的增加而降低,并且在恶劣的信道环境下,终端速度和CQI时延对LTE/LTE-A系统效率的影响更严重。Aiming at the complex time-varying characteristics of wireless channel, the adaptive modulation and coding ( AMC) technology is adopted for scheduling downlink resource to improve the reliability and performance of LTE/LTE-A system. The key of AMC technology is using real time channel quality indicator ( CQI) , the feedback from user terminal, to conduct downlink scheduling;but at present, in most of the existing LTE/LTE-A systems, the CQI delay is ignored to simplify the design of system. Thus the model of LTE/LTE -A system is established and combined with WINNER II channel model for simulated analyzing the influence of user equipment ( UE) and speed of CQI delay velouty on LTE/LTE-A system. The results show that the efficiency of LTE/LTE-A system is decreasing along with the increasing of the UE speed and CQI delay, and the impaction of UE speed and CQI delay on LTE/LTE system may be more serious under bad channel environment.

关 键 词：自适应 调制 编码 信道质量 信道模型 无线移动通信 高速路网 可靠性 

分 类 号：TH86[机械工程—仪器科学与技术] TP27[机械工程—精密仪器及机械]