基于LTE系统的巨量机器类通信性能分析

主要研究基于LTE（long term evolution）系统开展巨量机器类通信业务的性能。介绍了机器类通信的业务特点，并以北京近郊区的抄表类业务为例，分析了现有LTE系统开展机器类巨量用户通信时存在的问题。从理论上分析得到了随机接入资源和调度资源受限是制约终端接入数量的主要因素。本文搭建了符合3GPP标准的系统级仿真平台，仿真了不同用户数和不同下行控制信道资源对系统吞吐量、时延、接入碰撞概率等的影响，仿真结果验证了理论分析的正确性。 

Massive Machine-Type Communication Performance Analysis Based on Long Term Evolution (LTE) System

One of the distinctive characteristics of machine-type communication(MTC)is the huge amount and high density of devices. This paper mainly studied the performance of massive machine-type communication based on long term evolution(LTE) system. Firstly, the characteristics of MTC were introduced and the limits of LTE system were analyzed to support for massive MTC communication by the case of meter reading in Urban Beijing scenario. And then it was deduced that random-access resources and scheduling resources would be limited in massive MTC communication by using LTE system, which would lead to a loss of MTC subscribers. At last a MTC system-level simulation platform was set up to simulate the influence of different amount of devices and scheduling resources on the system throughput, delay, access collision probability, etc. Simulation results verified the conclusion of theoretical analysis.