融合核心网的研究和设计

发布时间：2018-01-16 08:10

本文关键词：融合核心网的研究和设计　出处：《兰州交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：TD-LTE网络建设初期,由于无线覆盖能力的限制,存在LTE无线信号较差或无覆盖区,在这部分区域运营商允许4G网络用户切换到2G/3G无线信号网络使用业务。由于4G和2G/3G接入网元和接入方式的不同,其不同制式网络担任控制功能的核心网部分不能适应现状的需求。在移动核心网将逐步演进成IP化的网络趋势下,亟待解决不同制式核心网的融合问题。不同制式的核心网融合存在的技术难题:不同制式核心网必然存在系统互操作,由此使得网络切换成功率偏低,位置更新时延较长;独立建设核心网,设备利用率低,维护工作量大。基于上述问题,本文详细研究2G、3G、4G不同制式的核心网组网方案和对应的网元功能,并结合甘肃移动的现有情况,细致分析甘肃移动的核心网融合组网方案。融合核心网技术方案技术分析:将同覆盖区或相邻覆盖区的无线接入网接入同一个MSC和SGSN,现有的电路域业务逐步过渡至分组域中实现,以减少系统间小区重选、位置更新和切换等操作,提高用户感知度。调整融合后的网络结构,本地网内话务经MSC间直达电路疏通,不需经GMSC等转接,减少路由迂回,减少传输资源的占用。建设融合HLR,用户号码不需划分,有利于用户数据的统一存储和集中管理。本文根据甘肃移动的用户规模和业务需求规模现状,基于不同角度分析用户和业务的发展需求规模,提出和规划部署甘肃移动融合核心网网络建设方案。甘肃移动融合核心网方案从电路域和分组域两方面逐步实施,在电路域方面,对负责不同区域的端局和关口局的相关网元进行现状分析,同时提出相应的融合改造方案和现有网元的扩容需求,对全网信令网的分布式架构HLR完成HSS的融合改造。在分组域方面,对负责全省不同区域的分组域组成网元进行现状分析,在此基础上提出相应的融合改造方案,针对现有网元SGSN、GGSN、CG、PCRF、DNS提出相应的扩容需求。通过甘肃移动融合核心网方案的研究部署和规划设计,相关工程已实施完毕并成功投入运营,后期的统计指标完全满足融合核心网的要求。融合核心网的技术方案在甘肃移动得出结论有:初期部署的融合核心网组网方式,信令交互和媒体路由更加清晰,由EPC核心网元承载数据业务,对于语音业务通过CSFB及双待终端的方式解决,在整个信令交互过程,优化的远端流程有效控制切换时间,清晰的网络架构减少了故障发生点。
[Abstract]:At the beginning of TD-LTE network construction, because of the limitation of wireless coverage ability, there is poor or no coverage area of LTE wireless signal. In this part of the region operators allow 4G network users to switch to 2G / 3G wireless signal network usage services because of the difference between 4G and 2G / 3G access elements and access methods. The core network with different control functions can not meet the needs of the current situation. Under the trend that mobile core network will evolve into IP network gradually. The convergence problem of different core networks is urgent to be solved. The technical problems of different core network fusion are as follows: there must be system interoperability in different core networks, which makes the success rate of network switching low. Long time delay of position update; Independent construction of the core network, equipment utilization rate is low, maintenance workload is large. Based on the above problems, this paper studies in detail the different core network scheme and corresponding network element function of 2G / 3G / 4 4G system. And combined with the current situation of Gansu mobile. Detailed analysis of Gansu Mobile core network integration networking scheme. Technical analysis of the core network technology: the same coverage or adjacent coverage of the wireless access network access to the same MSC and SGSN. The existing circuit domain services are gradually transitioned to packet domain to reduce inter-system cell reselection, location update and handover operations, improve user perception, and adjust the network structure after integration. The traffic in the local network is dredged through the direct circuit between the MSC, and the routing circuitry is reduced, the transmission resource is reduced, and the user number does not need to be divided. This paper analyzes the development demand scale of users and services from different angles according to the current situation of user scale and service demand scale of Gansu Mobile, which is conducive to the unified storage and centralized management of user data. Put forward and plan the plan of Gansu mobile fusion core network construction. Gansu mobile mobile fusion core network from the circuit domain and packet domain implementation in the circuit domain. At the same time, the paper analyzes the current situation of the relevant network elements in charge of the end bureau and the gateway bureau in different regions, at the same time, puts forward the corresponding fusion transformation scheme and the expansion demand of the existing network elements. In the aspect of packet domain, this paper analyzes the current situation of the network elements of packet domain in charge of different regions of the province. On this basis, the corresponding fusion transformation scheme is put forward, aiming at the existing SGSNN GG SNN CGRF. Through the research, deployment, planning and design of Gansu Mobile Fusion Core Network, the related projects have been implemented and successfully put into operation. The statistical indicators of the later period fully meet the requirements of the fusion core network. The technical scheme of the fusion core network in Gansu Mobile has concluded that the initial deployment of the integrated core network networking mode signaling interaction and media routing is more clear. The data service is carried by the EPC core network element, and the voice service is solved by CSFB and dual terminal. In the whole signaling interaction process, the optimized remote flow can effectively control the switching time. A clear network architecture reduces the point of failure.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5

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