LAA信道检测机制研究与仿真

Research and Simulation of Channel Detection Mechanism in LAA system

3GPP提出的LAA技术是一种可将LTE工作频谱扩展至非授权频谱的辅助接入技术。针对多运营商利用LAA技术部署在同一非授权频段的场景,研究了两种不同的先听后说的信道检测机制,从而解决该场景下运营商间相互竞争频谱资源的问题。基于3GPP研究报告TR 36.889给出的仿真需求,设计了基于MATLAB的LAA系统级仿真平台,并通过仿真对两种信道检测机制下系统吞吐量、时延性能进行了分析。仿真结果证明:两种信道检测机制都能使得两个运营商之间公平地共存,在特定的仿真参数下,基于帧结构的信道检测机制的整体性能优于基于负载的信道检测机制。

LAA proposed by the 3GPP is an auxiliary access technique which extend operating spectrum to the unlicensed spectrum. This paper focused on a scenario where multiple operators deploy LAA to deploy in the same unlicensed spectrum, and analyzed two different LBT channel detection mechanisms to deal with spectrum resource competition among operators in the scenario. According to simulation requirements in 3GPP TR 36.889, this paper designed a LAA system-level simulation platform based on MATLAB and evaluated the system throughput and latency of these two LBT channel detection mechanisms on the platform. Simulation results show that these two channel detection mechanisms can balance two operators fairly. Given specific simulation parameters, frame-based channel detection mechanism has better overall performance than load-based detection mechanism.