M2M接入控制技术的研究.pdfVIP

摘要 M2M 通信中，海量M2M 终端同时接入会导致现有移动通信网的无线接入网 过载，并严重影响 M2M 终端的通信性能。因此，结合M2M 流量特性和通信特 征，对M2M 终端进行有效的接入控制具有非常重要的意义。 在LTE 系统中，为了解决海量M2M 终端接入所导致的无线接入网过载问题， 提出一种流量自适应的 M2M 接入控制机制，通过估计与小区 M2M 终端实时到 达率相匹配的接入概率因子来控制 M2M 终端接入概率以避免无线接入网过载。 接着，在流量自适应接入控制机制作用下，针对异构网络中M2M 接入负荷不均 所引起的微微小区内 M2M 终端接入时延大于宏小区内M2M 终端接入时延的问 题，提出一种基于多小区协作的负荷均衡算法，通过调整协作集内宏小区和微微 小区的接入负荷均化不同小区内M2M 终端接入时延性能。同时，考虑到负荷均 衡所引起的小区 M2M 终端接入负荷振荡对M2M 终端接入吞吐量的影响，提出 一种吞吐量补偿算法，通过预估小区M2M 终端数改变后小区M2M 终端的稳态 到达率来确定最优的接入概率因子，从而确保接入概率因子作用下小区 M2M 终 端的接入吞吐量在最短时间内到达最大值。 关键词：M2M 接入控制 异构网络 负荷均衡 Abstract The simultaneous access of massive M2M devices will result in RAN(Radio Access Network) overload, and then severely affect the performance of M2M(Machine to Machine) communication. Therefore, it is of great significance to efficiently control the M2M devices access on the basis of M2M traffic characteristic and M2M features. In LTE system, to eliminate the RAN overload caused by massive M2M devices simultaneous access, an adaptive admission control mechanism for M2M communication is proposed, which decreases the M2M access traffic load by dominating the access probability of M2M devices. Then, under heterogeneous architecture, aiming at the problem caused by difference in traffic load, that the access delay of M2M devices under the adaptive admission control mechanism in picocells is larger than that of macrocells, a traffic load equalization algorithm is applied to homogenize the access delay performance of M2M devices by adjusting the traffic distribution in macrocells and picocells. Meanwhile, a compensation algorithm is designed to minimize the oscillation of the access throughput after cooperation. The