LTE网络S1-MME接口的研究与实现

发布时间：2018-10-31 20:24

【摘要】：伴随着移动互联网的快速发展，高速率无线数据业务的需求日益增多。为进一步发展移动通信网络，3GPP分别对无线接入网与核心网开展了LTE和SAE两大技术的标准化研究工作。LTE主要是研究无线接入网的发展方向和关键技术，而SAE则是研究核心网整体架构的演进。LTE/SAE技术提升了无线网络的性能，实现核心网的全IP化，扁平化的网络架构使得网元数量有所减少。核心网的MME是处理信令的重要网元，其S1-MME接口是E-UTRAN与EPC之间控制面的重要通信接口，使用S1AP协议进行信令消息的传递。论文主要从商用设备原型机的需求出发，对核心网侧的S1-MME接口实现方案进行分析设计，重点关注S1AP协议功能的实现。本文首先分析了LTE网络的架构、MME的功能、SCTP协议、S1AP协议等，讨论了S1-MME接口协议栈的工作原理。在分析协议栈的基础之上，提出S1-MME接口的架构方案以及相应功能在接口模块内的实现方式，并且结合MME的硬件和软件架构，，讨论了具体的软件实现方法。最后通过功能测试对实现方案的可行性进行验证。根据信令消息处理方式的不同，论文提出了信令分散式处理和信令集中式处理两种实现方案。通过对比和分析，选择了信令集中式处理方案作为S1-MME接口的实现架构。该方案将接口上所收到的信令消息，重新封装为统一格式的内部消息，放入消息队列中等候信令模块的处理。S1-MME接口模块可以分为SCTP子模块和S1AP子模块两个部分，文中针对这两个子模块在软件上的实现进行了深入的讨论。在论文的最后，根据LTE的基本信令流程，设计了一系列用于S1-MME接口功能测试的测试用例，并且对收集的测试数据进行详细的分析。根据测试结果，说明论文提出的实现方案是可行的。本论文所做的S1-MME接口软件开发工作，具有重要的实际应用价值。
[Abstract]:With the rapid development of mobile internet, the demand of high-rate wireless data service is increasing day by day. In order to further develop the mobile communication network, 3GPP has carried out the standardization research of LTE and SAE for the wireless access network and the core network, respectively. LTE mainly studies the development direction and the key technology of the wireless access network. SAE is to study the evolution of the core network architecture. LTE/SAE technology improves the performance of wireless network, realizes the core network IP, and the flat network structure reduces the number of network elements. The MME of the core network is an important network element for handling signaling, and its S1-MME interface is an important communication interface between E-UTRAN and EPC. The S1AP protocol is used to transmit the signaling message. Based on the requirements of commercial equipment prototype, this paper analyzes and designs the implementation scheme of S1-MME interface on the core network side, focusing on the realization of S1AP protocol. Firstly, this paper analyzes the architecture of LTE network, the function of MME, SCTP protocol, S1AP protocol and so on, and discusses the working principle of S1-MME interface protocol stack. Based on the analysis of the protocol stack, the architecture of the S1-MME interface and the implementation of the corresponding functions in the interface module are put forward. Combined with the hardware and software architecture of MME, the specific software implementation method is discussed. Finally, the feasibility of the implementation scheme is verified by functional test. According to the difference of signaling message processing methods, this paper proposes two schemes of signaling decentralized processing and signaling centralized processing. Through comparison and analysis, the signaling centralized processing scheme is chosen as the implementation framework of S1-MME interface. In this scheme, the signaling message received on the interface is re-encapsulated into a unified internal message, and the message queue is put into the message queue to wait for the processing of the signaling module. The S1-MME interface module can be divided into two parts: the SCTP sub-module and the S1AP sub-module. In this paper, the software implementation of these two submodules is discussed in depth. At the end of the paper, according to the basic signaling flow of LTE, a series of test cases for S1-MME interface function testing are designed, and the collected test data are analyzed in detail. According to the test results, it is proved that the proposed scheme is feasible. The development of S1-MME interface software in this paper has important practical application value.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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