结合5G的三大应用场景及其网络化需求,探讨了IP RAN网络的5G回传承载架构和增强型技术,对网络切片技术、Segment Routing技术、EVPN技术和网络智简进行了研究,并介绍了中国联通在IPRAN增强技术方面的部分创新实践.

The rapid development of leased line services has transformed the optical transport network from operator's basic network to leased line service network.With the withdrawal of MSTP,OTN has become the main network technology for high-value leased lines.Several key technical solutions and evolution of OTN carrying leased line were analyzed and researched.The problem of cascade protection in multi-domain OTN was researched.Interoperability of different venders’ equipment was researched and solved.SDN and OTN were proposed as the development direction for high-quality leased lines.ACTN-based SD-OTN controller northbound interface standard and YANG model,technical requirements of management and control for access OTN equipment were promoted in IETF and CCSA separately,which would promote decoupling of OTN network.China Unicom’s leading experience of development and deployment of SDN orchestrator on OTN for high quality leased line was shared.

5G网络即将开始试点部署,针对5G前传承栽段与回传承栽段,各大运营商提出了IPRAN、SPN、MOTN、G.metro等多种技术方案,重点探讨了基于IP RAN与PeOTN混合组网的5G回传承栽方案.首先介绍了当前5G回传承载的研究进展,明确了5G回传承载的目标网络架构,提出基于IP RAN与PeOTN混组组网的5G回传承载方案.

重点探讨了基于IP RAN网络演进的5G回传承载方案.首先介绍了当前5G回传承载的研究进展,明确了5G回传承载的目标网络架构,提出基于IP RAN网络演进的5G回传承载方案,包括基础承载方案和功能增强承载方案,并对功能增强承载方案中拟引入的EVPN技术、Segment Routing技术、网络切片技术、SDN技术进行了分析,并提出了应用建议.

ROADM技术可通过规划工具快速高效地实现对波长通道的远程灵活配置,而不对现有业务造成任何影响,是实现全光网络的重要基础.然而目前国内ROADM组网技术应用较少,经验尚缺,通过对ROADM组网规划软件及ROADM网络设备的研究,提出了规划软件对ROADM MESH组网建议,对ROADM工程建设具有参考意义.

5G移动通信网络与LTE网络相比,在架构上有很大的变化,因此首先从承载网的角度分析比较了5G网络架构与LTE的区别,以及这些变化对承载网的影响,随后分析了在当前阶段,5G网络设备和部署方面存在的不确定性及其对承载网的影响,并针对这些不确定性提出建议.

ATM网络的萎缩与ATM业务的稳定发展之间的矛盾对运营商提出了巨大的挑战.首先介绍了运营商ATM网络与业务的现状以及需要解决的问题,然后阐述了ATM业务替代性技术体系架构,详细介绍了各种ATM业务替代技术方案以及相关测试验证情况,最后对ATM业务转网策略加以总结.

Multi-vendors G.654.E fibres field trials for 400G terrestrial transport systems were demonstrated. The evaluation works carried out by China Unicom for high bitrate terrestrial transport application are introduced. Test results in factories and fields are analyzed detailed.

As an important performance parameter of network,delay is getting more and more attention of service users and network op-erators,including TDM based network and packet based network. The delay measurement function based on ODUk overhead of OTU frame in 100G OTN/WDM was discussed,and the application scenarios in transport network were analyzed. Based on the experimental results,the functions and accuracies of delay measurement in current 100G WDM/OTN equipments were analyzed. Final y,the further requirement of delay measurement was proposed according to the OAM demand of transport network.

移动网络在人们的生活和工作中得到了广泛应用，该网络规模也在逐渐扩大与完善。然而，随着移动网络的广泛使用，也出现了越来越多的问题。为了不对人们的工作生活产生不必要的影响，做好移动通信网络的维护及管理是非常有必要的。基于此种形势，笔者结合实际工作经验，分析了目前移动通信网络维护管理工作中存在问题的原因，进而有针对性地提出了相应的完善措施，希望为提高行业技术进步贡献自己的一份力量。

The techniques of optical supervisory channel,electronical supervisory channel and external DCN are mainly used for the net-work OAM in optical transport network,and OSC technique nowadays is mostly utilized. As the wide deployment o optical transport network equipments,ESC technique is also used more. ESC based on GCC of OUT frame was introduced firstly,af-ter the comparison between ESC and OSC techniques,the technique specification and application scenarios of ESC based on GCC in optical transport network were analyzed and suggested.

The key functionality of packet-enhanced OTN for telecom operators has been analyzed. Especial y, MPLS-TP is proposed as the proper solution for packet-enhanced function in packet-enhanced OTN other than Ethernet. The application scenarios of packet-enhanced OTN deployed in broadband access service, leased-line service, mobile backhaul and IP layer bypass are al-so particularly researched.

It analyzes the col aborative application of SDN to IP layer and optical layer, discusses the integrated architecture of IP and opti-cal layer based on SDN, expounds the evolution of smart control in the convergence of IP layer and optical layer.

Beginning with the application situation and requirements of local integrated carrying transport network, it gives the network ar-chitecture and networking model of local integrated carrying transport network based on SDN, analyzes the problems on SDN technology.

It first presents current situation and trend of control plane of optical network, discusses the convergence policies based on dif-ferent stages, according to the technology maturity and operators’requirements. Final y, it analyzes some key technologies that help this convergence.

It gives a convergence technology of OTN and UTN based on SDN to realize the coordination on end-to-end OAM, protection switching in the hybrid networking of OTN and UTN. The convergence technology can be divided into the solution based on current network renovation and the solution based on the separation of transfer and control.

A solution on encapsulation flexibility and intel igent control mechanism utilizing ROADM and Flex Grid for beyond 100G optical transport system is particularly proposed. The functionalities of control plane modules are discussed specifical y for the high-efficiency interworking of ROADM and whole beyond 100G system, to achieve next generation smart elastic optical transport network.

On the basis of analyzing mapping, multiplex structure, multi-segment protection, colorless interface application, service clas-sification of ASON in the backbone network, service protection at the metro network and interconnection between backbone and metro are given, and the end to end bearing scheme of high speed leased line service is given.

Based on the expound of LTE network architecture, it deeply analyzes the characteristics of LTE backhaul IP transport, high bandwidth, multi point to multi point, delay and synchronization, presents the backhaul network model for LTE service, to provide reference for the organization of backhaul network.

With the fast growth of IP business and the rapid development of the WDM technology, the traditional optical network is evolving into the all-optical network suited for transmitting IP business. It analyzes the development of the key technology of all-optical network and proposes a plan for the management and optimization of the line injury of the all-optical transport network to realize the application of the all-optical transport network.