TD-LTE公网集群多媒体业务上行资源调度的研究

发布时间：2018-01-02 19:10

本文关键词：TD-LTE公网集群多媒体业务上行资源调度的研究　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：集群通信系统是按照动态信道指配的方式实现多用户共享信道的无线移动通信系统。近年来,TD-LTE技术已经成为主流技术,基于TD-LTE现有标准,设计TD-LTE集群系统架构和资源分配方案是非常有必要的。随着当前移动互联网的高速发展以及全球各城市无线网络的大规模建设,宽带化成为了整个无线通信的发展趋势;与之对应,集群通信技术将在某种程度向IP系统、多元化业务、宽带数据和多模终端的方向发展。公网集群系统在交通运输、能源、电力、金融、物流等行业均具有一定的应用前景,因此LTE公网集群通信的发展方向是一个必然的发展方向。TD-LTE是LTE的两大标准之一,是TD-SCDMA演进的结果,目前TD-LTE公网的覆盖范围很广,建立依托于TD-LTE公网的集群系统,可以利用TD-LTE公网所覆盖的网络,这样对于集群业务的运营成本和维护成本都可以做到一定程度上的降低。本文重点对LTE上行链路资源调度算法进行了研究,首先分析了上行链路和下行链路的区别以及LTE常用的一些资源调度算法,然后研究了一些可用于上行链路的资源分配调度算法:轮询启发式算法、第一极值扩张法、递归式启发式算法以及包络差异值启发式算法,并且分别描述了这些算法的具体过程以及优缺点,指出了这些算法应用于集群网络的关键技术问题。本文明确了在LTE公网集群系统中考虑优先级的重要性,并提出了一种可用于LTE公网集群上行链路的资源分配算法。这种算法主要在以下三个方面做出改进:系统中不同的用户具有不同的优先级,这种算法通过改变传统算法中分配资源时使用的度量矩阵来为具有不同优先级的用户分配资源;使用了一种提升频谱利用率和吞吐量的方法,通过修剪资源块的方法来达到进一步提升系统吞吐量和频谱利用率的目的,并通过吞吐量公式和频谱利用率公式对其进行了分析;使用了一种在信道资源不好的情况下处理资源块的方法,将自动重传请求之间的资源块保留。在本文之前提出的具有优先级的算法基础上,又对这种算法就公平性方面进行进一步改进,通过用户具有的资源块数量来改进算法的公平性,如果分配的资源块过多则降低其优先级。通过LTE-sim仿真平台对其进行仿真并分析可以得出,增加了优先级之后系统的吞吐量和频谱利用率不但没有下降而且有所提升,而在此基础上对算法公平性的改进也使其公平性有所增强,能够使公平性指数更高。
[Abstract]:Trunking communication system refers to the wireless mobile communication system with the shared channel according to the dynamic channel. In recent years, TD-LTE technology has become a mainstream technology, the existing TD-LTE standard based on TD-LTE cluster system design architecture and resource allocation scheme is very necessary. With the rapid development of mobile Internet and large-scale construction city wireless networks around the world, became the development trend of the broadband wireless communication; and the trunking communication technology will be diversified to IP system, in a certain degree of business, broadband data and multi-mode terminal direction. Public cluster system in transportation, energy, electricity, finance, logistics and other industries have a certain application prospect therefore, the development direction of LTE network cluster communication is an inevitable direction of development of.TD-LTE is one of the two major LTE standards, is the evolution of TD-SCDMA The current TD-LTE network coverage is very wide, a cluster system based on TD-LTE network, you can use the TD-LTE network coverage network, such as cluster service operation and the maintenance cost can be reduced to a certain extent. This paper focuses on the LTE uplink resource scheduling algorithm is studied, the paper analyzes the uplink the difference between the LTE and the downlink and some commonly used scheduling algorithm, and then study some resource allocation for uplink scheduling algorithm: polling heuristic algorithm, the first extreme expansion of Zhang Fa, a heuristic algorithm of recursive heuristic algorithm and the difference between the value of the envelope, and describes the specific process of these algorithms and the advantages and disadvantages, points out the key technical problems the algorithm is applied to cluster network. This paper defines in LTE network cluster system into senior high school entrance examination priority. The importance, and proposed a resource allocation algorithm for LTE network cluster uplink. This algorithm is improved in the following three aspects: users of different systems have different priorities, this algorithm to allocate resources for users with different priorities by changing the use of resource allocation in the traditional algorithm when using the metric matrix; a method to improve the spectrum efficiency and throughput, to further improve the system throughput and spectrum utilization by pruning resource blocks, and analyzes the utilization rate through the throughput formula and the formula of frequency spectrum; using a method of processing resource blocks in the channel resource situation is not good and the resource blocks retained between the automatic repeat request. In this paper before with priority algorithm, and the algorithm is fairness For further improvement, the fairness of resource block number through the user has to improve the algorithm, if the resource block allocation too much lower the priority. Through the LTE-sim simulation platform to simulate and analysis can be drawn, then increase the priority system throughput and spectrum utilization rate has not decreased but increased, and on the basis of on the improvement of the fairness algorithm also makes its fairness has been enhanced, enabling the fairness index higher.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5

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