LTE中M2M接入拥塞控制的研究

发布时间：2018-03-20 09:44

本文选题：M2M　切入点：H2H　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着M2M(机器到机器)业务的迅速发展,现有移动通信网已经无法满足M2M通信的发展速度,尤其是M2M流量具有“潮汐效应”,即突发的大规模的M2M设备接入,这将对其他正常的通信造成极大的影响,因此需要设计针对大量M2M设备同时接入的接入控制策略,同时对于应该优先保证的H2H(人到人)通信也将会造成巨大的冲击,而M2M通信中往往也分为多种通信优先级,因此设计能够保障H2H通信或者M2M中高优先级通信优先接入的接入控制策略就十分有必要了。本文提出了一种自适应资源划分算法来缓解接入拥塞。首先,在ACB(接入类禁止)机制的基础上提出了能够根据实时负载动态调整接入控制系数的动态ACB机制,从而使网络吞吐量能维持在较优的状态,并对于实时负载的获取这一核心问题,提出了负载跟踪算法。算法中通过对空闲前导序列数的估计来近似实时负载的估计。算法通过设定统计帧,同时进行稳态估计与统计帧估计能够有效地估计稳态负载,并能在给定性能要求下对负载跃变进行准确及时的跟踪判断,为之后的接入控制策略提供准确及时的参数。然后,针对H2H通信与M2M通信共存的情况下M2M通信爆发式接入引起的接入拥塞问题,先分析了退避重传机制对到达率的影响,之后再结合动态ACB机制通过理论分析在不同情况下的最优资源划分方式,最后结合动态ACB机制与动态资源划分提出了自适应资源划分算法,实现了网络吞吐量的最优化以及不同通信优先级的区分,能够有效缓解接入拥塞,提高网络性能,最优化收益函数。最后,将自适应资源划分算法从双优先级情况推广到多优先级的情况,先通过理论分析论证该情况下最优的资源划分方式,之后将动态ACB机制与动态资源划分根据多优先级的情况进行适配,从而使自适应划分算法在多优先级的情况下依然能够发挥良好的性能。
[Abstract]:With the rapid development of M2M (machine-to-machine) service, the existing mobile communication network can no longer meet the speed of M2m communication, especially the "tidal effect" of M2M flow, that is, the sudden large-scale M2m equipment access. This will have a great impact on other normal communications, so it is necessary to design an access control strategy for simultaneous access to a large number of M2M devices. At the same time, it will also have a huge impact on the H2H (human to human) communications, which should be guaranteed first. M2m communication is often divided into multiple communication priorities, Therefore, it is necessary to design an access control strategy that can guarantee the priority access of H2H communication or M2M high priority communication. In this paper, an adaptive resource partitioning algorithm is proposed to alleviate the access congestion. Based on the ACB mechanism, a dynamic ACB mechanism which can dynamically adjust the access control coefficient according to the real-time load is proposed, so that the throughput of the network can be maintained in a better state, and the core problem of obtaining the real-time load is discussed. A load tracking algorithm is proposed, in which the estimation of the number of idle leading sequences is used to approximate the estimation of the real time load. The algorithm can estimate the steady load effectively by setting the statistical frame and simultaneously estimating the steady state and the statistical frame. And it can track and judge the load jump accurately and timely under the given performance requirement, and provide accurate and timely parameters for the subsequent access control strategy. In order to solve the problem of congestion caused by explosive access in M2m communication, the influence of Backoff retransmission mechanism on the arrival rate is analyzed. Then combining the dynamic ACB mechanism with the theory analysis of the optimal resource partition in different situations, finally, combining the dynamic ACB mechanism and the dynamic resource partition, an adaptive resource partitioning algorithm is proposed. It realizes the optimization of network throughput and the distinction of different communication priorities, which can effectively alleviate access congestion, improve network performance and optimize revenue function. In this paper, the adaptive resource partition algorithm is extended from double priority to multi-priority, and the optimal resource partition method is demonstrated by theoretical analysis. Then the dynamic ACB mechanism and the dynamic resource partition are adapted according to the situation of multiple priorities, so that the adaptive partition algorithm can still play a good performance in the case of multiple priorities.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

【相似文献】