面向LTE的传输网优化方案研究

发布时间：2018-12-26 08:34

【摘要】：LTE(Long Term Evolution)网络与2G、3G网络相比,取消了BSC(Base Station Controller)/RNC(Radio Network Controller),整体网络架构逐渐趋于扁平化。业务流量通过多个核心网元进行汇聚,网络组网发生了变化。LTE网络具有更快的传输速率、更高的频谱利用率、更宽的网络频谱、更大的容量和更强的灵活性等特点。由于LTE网络存在S1、X2等接口,加入L3 VPN可实现根据目的IP地址进行转发,满足业务接口承载要求及基站IP化的改造需求。当前,针对L2层、L3层混合组网的LTE传输网络,传输业务的配置方式更加复杂,其组网结构和保护方式与传统基站承载方式不同,这就对LTE传输网络优化提出了更高的要求。特别是在Vo LTE(Voice over LTE)时代,对传输网络的传输质量要求更高。本文对某省LTE传输省干及本地网核心层网络优化方案进行研究,主要研究内容如下:1)对比分析三大运营商的网络架构及其优劣性,总结各种组网架构的特点。研究传输网络内部及与核心网UNI(User Networks Interface)侧对接技术,确定可靠的对接应用场景,以满足LTE网络的承载需求。2)分析当前承载LTE业务的传输网络的关键技术,对比总结各种保护技术的应用场景。为了更好的支撑LTE网络,传输网络需要采用多种保护技术混合的方案,以应对各种故障。对比分析桥节点、端口、隧道、环网等多种保护方案,并对典型故障场景的业务流量走向进行研究,对网络存在隐患进行分析,提出LTE传输网络保护层面的优化方案。3)针对各类业务模型逐一分析各种Qo S(Quality of Service)部署方案的合理性,针对端口、AC流点、PW、TUNNEL各个位置的Qo S部署方案进行分析,给出面向LTE传输网络Qo S部署方案。4)针对传输现网主备路径均中断无法有效的提供第三路由保护的问题;以及L3 PTN网络某点的上行的多条出口均中断时,无法有效的联动其下行失效端口的问题。研究了分组网的联动功能,将一个网络内的故障映射到另外的网络中,从而在远端进行保护倒换,将业务绕过出现多处链路故障的孤立节点。本文的研究工作,对LTE传输网络优化具有一定的参考价值。
[Abstract]:Compared with 2GN 3G network, LTE (Long Term Evolution) network cancels the whole network architecture of BSC (Base Station Controller) / RNC (Radio Network Controller), and tends to flatten gradually. Service traffic converges through multiple core network elements, and network networking changes. LTE network has the characteristics of faster transmission rate, higher spectral efficiency, wider network spectrum, greater capacity and greater flexibility. Due to the existence of S1 / X2 interface in LTE network, L3 VPN can be used to forward the network according to the destination IP address, which can meet the requirement of service interface carrying and the transformation of base station IP. At present, for the LTE transmission network of L2 layer and L3 layer hybrid network, the configuration of transmission services is more complex, and the network structure and protection mode are different from the traditional base station carrying mode, which puts forward higher requirements for the optimization of LTE transmission network. Especially in the era of Vo LTE (Voice over LTE), the transmission quality of transmission network is higher. The main contents of this paper are as follows: 1) the network architecture of the three major operators and their advantages and disadvantages are analyzed, and the characteristics of various network structures are summarized. This paper studies the interfacing technology of transmission network and UNI (User Networks Interface) side to the core network, and determines the reliable docking application scenario to meet the carrying demand of LTE network. 2) analyzing the key technology of the current transmission network carrying LTE service, The application scenarios of various protection technologies are compared and summarized. In order to better support the LTE network, the transmission network needs to adopt a variety of protection technology mix scheme to deal with various failures. Compared and analyzed the bridge node, the port, the tunnel, the ring network and so on many kinds of protection schemes, and carries on the research to the typical fault scene service flow direction, carries on the analysis to the network existence hidden danger, The optimization scheme of LTE transmission network protection level is put forward. 3) the rationality of various Qo S (Quality of Service) deployment schemes is analyzed one by one for various service models, and the Qo S deployment schemes for ports, AC stream points and PW,TUNNEL locations are analyzed. The deployment scheme of Qo S to LTE transmission network is given. 4) aiming at the problem that the main and backup paths of the current transmission network can not effectively provide the third route protection; And the problem that the downlink failure port of L3 PTN network can not be effectively linked when the multiple outlets of the uplink of L3 PTN network are interrupted. In this paper, the linkage function of packet network is studied. The fault in one network is mapped to another network, and the remote protection switching is carried out, and the traffic bypasses the isolated nodes with multiple link failures. The research work of this paper has certain reference value for LTE transmission network optimization.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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