基于LTE网络下M2M随机接入技术的研究
发布时间：2018-08-04 16:37
【摘要】：目前，物联网正在快速崛起，其发展的终极目标就是把世界范围内的所有机器像人一样组成一个巨大的网络。而机器对机器的通信M2M作为实现机器网络的通信工具和手段，，势必会引入海量的M2M终端接入网络，从而就有大量的M2M业务出现，这将会给现有的网络带来巨大的挑战，致使其接入成功率、系统吞吐量、资源利用率等性能指标降低。因此，如何改善上述性能指标成为诸多学者和专家研究的热点。本文是在LTE系统的基础上，通过对随机接入协议、算法和接入方式的深入了解，引入M2M业务的随机接入，来探究对传统H2H业务带来的影响。 本文研究的第一个重点是关于M2M终端和H2H终端竞争随机接入所需前导码的分配问题。首先对现有的前导码分配方案进行了分析，明确了现有方案是无法根据接入终端数量的变化作出灵活的调整，指出了提高资源分配的灵活性是高效利用随机接入资源的有效途径之一。其次从前导码分配灵活性的角度出发，提出了一种关于资源共享的改进方案，该方案分为了M2M专用前导码、H2H专用前导码和共享的前导码三部分。其思路是在接入时两类终端先使用自己的专用前导码部分，当专用前导码不够时在根据接入情况，灵活的使用共享前导码。最后用数学的方法给出分析模型，通过仿真实验得出了改进后的方案能够有效的提高系统吞吐量，减少了网络资源的浪费。 本文研究的第二个重点是关于M2M终端接入成功率的问题。首先对M2M业务的现状进行了分析，发现了M2M业务具有在服务目标和时延敏感度等方面的相似性。由于海量的M2M终端随机接入给LTE系统带来拥塞等影响，这样势必会导致LTE系统以及原来的H2H业务受到影响。所以，改善M2M终端接入质量具有很重要的意义。其次从M2M业务具有群组特性和时延敏感度角度出发，提出了一种基于分组的M2M终端随机接入方案，该方案是把具有相似服务特性的终端分为一组，对于时延敏感度高的终端做特殊处理。最后通过仿真分析得出：该方案相对于传统方案能有效的提高M2M终端的接入成功率，并且，对同一组终端通过多次寻呼的方法可以减少首次未成功接入网络的终端数，有效的保证了系统的性能。
[Abstract]:At present, the Internet of things is rising rapidly. The ultimate goal of its development is to make a huge network like all the machines around the world. As a communication tool and means to realize the machine network, the machine's communication M2M is bound to introduce a large number of M2M terminal access networks, thus a large number of M2M services appear. This will bring great challenges to the existing network and reduce the performance indicators such as the success rate of access, the system throughput and the utilization of resources. Therefore, how to improve the performance indicators has become a hot spot for many scholars and experts. This paper is based on the LTE system, through the depth of random access protocols, algorithms and access methods. In order to explore the impact on traditional H2H services, we introduce random access to M2M services.
The first focus of this study is on the allocation of preamble codes required for the competitive random access of M2M terminals and H2H terminals. First, the existing preamble allocation scheme is analyzed, and the existing scheme is not able to adjust flexibly according to the change of the number of access terminals. It is pointed out that the flexibility of improving resource allocation is efficient. One of the effective approaches to random access resources. Secondly, an improved scheme for resource sharing is proposed, which is divided into three parts: M2M dedicated preamble code, H2H dedicated preamble code and shared preamble code. The idea is that the two classes of terminals use their own private preamble first when they are connected. Part, when the special preamble code is not enough, the shared preamble is used flexibly according to the access situation. Finally, the mathematical method is used to give the analysis model. The improved scheme can effectively improve the system throughput and reduce the waste of network resources.
The second focus of this study is on the success rate of M2M terminal access. First, the status of M2M service is analyzed, and the similarity of M2M service in service target and time delay sensitivity is found. Because the mass M2M terminal random access to the LTE system brings the impact of the plug and so on, it will inevitably lead to the LTE system And the original H2H service is affected. Therefore, it is of great significance to improve the quality of M2M terminal access. Secondly, based on the group characteristics and time delay sensitivity of M2M service, a packet based M2M terminal random access scheme is proposed, which divides the terminals with similar service characteristics into a group and is sensitive to time delay. Finally, the simulation analysis shows that the scheme can effectively improve the success rate of the M2M terminal relative to the traditional scheme, and can reduce the number of terminal number of the first unsuccessful access network by multiple paging to the same terminal, and effectively guarantee the performance of the system.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：2164468
[Abstract]:At present, the Internet of things is rising rapidly. The ultimate goal of its development is to make a huge network like all the machines around the world. As a communication tool and means to realize the machine network, the machine's communication M2M is bound to introduce a large number of M2M terminal access networks, thus a large number of M2M services appear. This will bring great challenges to the existing network and reduce the performance indicators such as the success rate of access, the system throughput and the utilization of resources. Therefore, how to improve the performance indicators has become a hot spot for many scholars and experts. This paper is based on the LTE system, through the depth of random access protocols, algorithms and access methods. In order to explore the impact on traditional H2H services, we introduce random access to M2M services.
The first focus of this study is on the allocation of preamble codes required for the competitive random access of M2M terminals and H2H terminals. First, the existing preamble allocation scheme is analyzed, and the existing scheme is not able to adjust flexibly according to the change of the number of access terminals. It is pointed out that the flexibility of improving resource allocation is efficient. One of the effective approaches to random access resources. Secondly, an improved scheme for resource sharing is proposed, which is divided into three parts: M2M dedicated preamble code, H2H dedicated preamble code and shared preamble code. The idea is that the two classes of terminals use their own private preamble first when they are connected. Part, when the special preamble code is not enough, the shared preamble is used flexibly according to the access situation. Finally, the mathematical method is used to give the analysis model. The improved scheme can effectively improve the system throughput and reduce the waste of network resources.
The second focus of this study is on the success rate of M2M terminal access. First, the status of M2M service is analyzed, and the similarity of M2M service in service target and time delay sensitivity is found. Because the mass M2M terminal random access to the LTE system brings the impact of the plug and so on, it will inevitably lead to the LTE system And the original H2H service is affected. Therefore, it is of great significance to improve the quality of M2M terminal access. Secondly, based on the group characteristics and time delay sensitivity of M2M service, a packet based M2M terminal random access scheme is proposed, which divides the terminals with similar service characteristics into a group and is sensitive to time delay. Finally, the simulation analysis shows that the scheme can effectively improve the success rate of the M2M terminal relative to the traditional scheme, and can reduce the number of terminal number of the first unsuccessful access network by multiple paging to the same terminal, and effectively guarantee the performance of the system.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
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