基于智能城域网的政企专线方案研究与实践

介绍了网络技术发展和专线业务需求，结合智能城域网网络架构与特征，提出了层次化VPN和端到端政企专线部署方案。通过对比分析和实验验证认为，2种专线方案各有优势，应结合网络设备能力、业务开通复杂度等选择合适的业务部署方案。     

广电智能网络运营平台建设实践

简要介绍江苏有线建设的广电智能网络运营平台,通过模拟DOCSIS机制实现了FTTH与DOCSIS两种不同接入网的端到端自动装维一致性体验。平台将业务开通系统与BOSS、GIS、用户分析系统、终端质量监测系统、工单系统等进行整合,将业务流程逻辑进行梳理规整,通过数据及流程的标准化、规范化实现了不同业务不同网络的全业务统一开通和运维,并实现了网络资源的全程标准化录入管理,为用户大数据综合分析提供了多维度的全流程数据来源,供网格工程师进行精准主动运维、供市场部门进行精准用户分析。     

一种基于移动网络的端到端认证机制

为基于移动网络的业务通信双方-业务签约者和业务提供者之间建立一种端到端的相互信任关系,提出了一种新的基于移动网络的应用服务端到端认证机制。研究了移动网络业务通信的发展趋势和安全威胁,介绍了3GPP中的通用鉴权框架的认证机理,指出了它的不足,并且提出了改进方法。介绍了端到端认证机制的总体框架和协议流程,并对其安全性、通用性、灵活性进行了分析。给出了该认证机制的应用场景。     

SD-OTN多控制系统协同关键技术及应用

分析OTN专线业务开通诉求,阐述了OTN网络SDN化现状以及控制系统北向接口标准化存在的主要问题,对多控制系统协同的关键技术进行论述,提出了统一的资源模型、业务模型和多协议适配的技术架构,研发实现SD-OTN协同器系统,并对其系统架构和功能架构进行详细阐述,SD-OTN协同器支持跨域厂商场景下业务端到端自动开通,实现O...     

SDN在传送网络的引入与应用分析

认为软件定义网络(SDN)引入传送网可以较为显著地提升资源利用、运维管理等能力,在基站业务、集客业务、家宽业务、光缆网络等应用场景中可通过软件定义网络+分组传送网(SDN+PTN)、软件定义网络+分组传送网+光传送网(SDN+OTN)、软件定义网络+分组传送网+光传送网+无源光网络(SDN+PON)、智能光配线网络(ODN)等实现网络与SDN的结合,实现业务的灵活调度、资源利用率的有效提升、全局性的资源配置。针对每张网络的特点和技术成熟度,对传送网引入SDN的路径进行了分析,尤其针对SPTN(即SDN+PTN)的网络结构和技术要求展开了分析,并对试点情况进行了介绍。最后,对比了SDN引入前后网管的组织架构,并提出SDN引入后各层功能的变化。     

智能专线业务编排系统架构设计与实现

在SDN/NFV技术时代,为满足新型网络业务快速自动开通的目标,提出一种智能专线业务编排系统的架构设计和实现方案。按照各功能松耦合、灵活部署的特点,将编排器系统架构设计为业务入口层、网络服务层和适配层三层解耦的架构体系实现。将编排器工作流程拆分为业务准备流程和业务下发流程两部分实现。通过开发实践验证,编排器作为核心系统,基本满足最初对业务编排的业务需求和运维管理需求。     

广电NGB时代OSS系统解决方案

建设思路与系统规划 关键特征：端到端;主动运维：面向客户与业务;全程支撑：网络规划,网络工程,业务开通网络保障,客户服务等。     

全业务网络端到端业务开通研究

深入讨论了全业务运营对移动通信网络架构的影响,分析了语音及多媒体业务、数据业务、WLAN业务类型及接入和承载方式,重点梳理了这三类业务的端到端开通方式。     

OTN控制器北向统一接口模型研究与实践

在软件定义光传送网络（software defined optical transport network,SDOTN）体系架构中,要求厂商控制器系统通过北向接口接入光传送网络（optical transport network,OTN）业务协同器系统。但是目前没有统一的北向接口标准,这给SDOTN跨域跨厂商端到端业务自动开通带来了比较多的问题。阐述了OTN控制器北向开放接口标准现状及问题,从网络模型角度对当前主流的电话应用编程接口（telephone application programming interface,TAPI）和流量工程网络抽象与控制（abstraction and control of traffic engineering network,ACTN）北向接口标准进行了比较和分析。最后,介绍了中国联通在ACTN统一接口模型标准化和管控系统建设两个方面的研究实践,并对后续研发方向进行了展望。     

移动网络端到端容灾建设思路探讨

本文从移动网络端到端容灾的角度对网络容灾建设思路进行探讨,论文主要分析了基础网络、业务网络、支撑网络等不同层面的网络容灾需求,以基础网络为例对端到端的网络容灾进行了分析,提出了全网络容灾目标,并给出网络容灾实施建议。     

SDN-based architecture for providing quality of service to high-performance distributed applications

The specification of quality of service (QoS) requirements in most of the existing networks is still challenging. In part, traditional network environments are limited by their high administrative cost, although software-defined networks (SDNs), a newer network paradigm, simplify the management of the whole network infrastructure. In fact, SDN provides a simple way to effectively develop QoS provisioning mechanisms. In this sense, we explore the SDN model and its flexibility to develop a QoS provisioning architecture. Through the use of our new architecture, network operators are able to specify QoS levels in a simple way. Each individual data flow can be addressed, and the architecture we propose also negotiates the QoS requirements between the network controller and applications. On the other hand, the network controller continuously monitors the network environment. Then, it allocates network elements resources and prioritizes traffic, adjusting the network performance. We evaluate the feasibility of our QoS provisioning mechanism by presenting three experimental setups under realistic scenarios. For example, for a given scenario where we evaluate file transfers, our results indicate that the additional SDN modules present negligible overhead. Moreover, for a given setup, we observe a reduction of up to 82% in the file transfer times.     

The intelligent multi‐domain service function chain deployment: Architecture,challenges and solutions

Network function virtualization (NFV) technology achieves flexible service deployment by replacing the middleboxes with virtual network functions (VNFs). In NFV, a set of VNFs are chained in a given order, called service function chain (SFC), and accordingly, data flow is steered to traverse all the VNFs in order to offer a service. With a large number of network devices and end users being connected into Internet, there is a growing demand for large‐scale multi‐domain networks to dynamically deploy the SFC across multiple network domains, in order to support efficient service provisioning. To this end, in this paper, we first investigate the state of the art of multi‐domain SFC deployment, and then propose an intelligent multi‐domain SFC deployment (IMSD) architecture by leveraging software‐defined networking (SDN), NFV, and deep learning technologies. Furthermore, we discuss the potential challenges to realize the IMSD and provide some promising solutions.     

Virtual infrastructure mapping in software-defined elastic optical networks

Software-defined networking (SDN) enables efficient and scalable network virtualization, which allows infrastructure resources such as computing and networking resources to be abstracted and outsourced as a service. The SDN technologies can be extended to the optical transport networks to achieve an intelligent and flexible resource management, thus achieving high-capacity, low-cost, and long-reach optical transport networks. In this paper, we introduce an architecture for software-defined elastic optical networks and study the virtual infrastructure (VI) mapping problem with the objective of minimizing the blocking probability. We propose a set of efficient heuristic algorithms, among which the Network followed by Compute Load Balancing (NCLB) algorithm is a novel attempt to solve the VI mapping problem by provisioning the networking resource first followed by allocating the computing resource. Furthermore, we propose a modified version of NCLB, called Network Depth-based NCLB (ND-NCLB), which confines the VI mapping assignment in a small-range sub-network to further optimize the physical network resource consumption. Through comprehensive simulations in various scenarios, we demonstrate that the proposed ND-NCLB algorithm achieves the best performance in terms of blocking probability compared to the other algorithms in this work.     

Adaptive DC interconnection provisioning in distributed all-optical micro-datacenters using holistically SDN orchestration for dynamic access

The metro-embedded datacenter (ME-DC) architecture which is based on micro-DCs (mDC) is introduced and implemented to deliver more flexible services with less access latency. Hierarchical SDN control is employed to adaptively interconnect the distributed mDCs and the metro network slices into re-configurable virtual DC (VDC). Such an approach improves the overall resource mobility, especially for traveling users that need to dynamically access the service. In this paper, the VDC re-configuration and pre-configuration mechanisms for dynamic user access are proposed and demonstrated for the first time. In specific, by re-configuring the VDC with the most accessible resources with user location tracking, fast and flexible service is provided with consistent service access. Furthermore, by pre-configuring the VDC with user prediction, mDC and metro network resources are reserved in advance for users in order to provide seamless service. Demonstration based on the implemented ME-DC prototype shows that VDC is adaptively constructed for dynamic user access with fast and flexible service provisioning.     

下一代智能融合城域网方案

首先论述了目前运营商城域网存在的主要问题、智能城域网的引入背景和应用的主要技术，然后结合城域网的规模和技术引入时间介绍了网络部署方案和业务组织方案，并对通信云建设过程中与智能城域网的融合方式进行了分阶段阐述。通过分析，指出智能城域网建设是运营商SDN/NFV网络重构和云网融合过程中的重要环节，对于综合承载现有城域业务，应对未来业务云网边协同都有着重要价值，需要结合建设过程不断积累运营经验。     

An advanced location information management scheme for supporting flexible service provisioning in reconfigurable mobile networks

The evolution of third-generation mobile communications networks has nominated the requirements for flexible service provisioning, intelligent and customized charging, as well as location-aware service and data management as key enablers for the support of new advanced service offerings to mobile users. Our work is related to the design and implementation of a flexible service provisioning and reconfigurability management middleware for third-generation systems and beyond. The article focuses especially on the location-related features and functionality of our architecture, discussing the interactions required to accomplish location- and mobility-aware user profiling, service deployment and discovery, as well as charging and billing.     

A novel multicast traffic engineering technique in SDN using TLBO algorithm

In recent years, multicast communication is widely used by network providers to deliver multimedia contents. Quality of service (QoS) provisioning is one of the most important issues while transmitting multimedia contents using multicast. Traditional IP multicasting techniques suffer from reliability, scalability and have limitations to provide appropriate QoS for multimedia applications based on service level agreement (SLA). Nowadays, the advent of software defined networking (SDN), enables network providers to manage their networks dynamically and guarantee QoS parameters for customers based on SLA. SDN provides capabilities to monitor network resources and allows to dynamically configure desired multicasting policies. In this paper, we proposed a novel multicasting technique to guarantee QoS for multimedia applications over SDN. To deliver multimedia contents in an efficient manner, our proposed method models multicast routing as a delay constraint least cost (DCLC) problem. As DCLC problem is NP-Complete, we proposed an approximation algorithm using teaching–learning-based optimization to solve this problem. We evaluated our proposed method under different topologies. Experimental results confirmed that our proposed method outperforms IP multicast routing protocol, and it achieves a gain of about 25% for peak signal-to-noise ratio.     

智能网业务开通能力提升研究

本文首先介绍了智能网业务批量开通时存在的问题,包括SMP设备性能、内部业务处理逻辑、CRM和业务开通系统存在的瓶颈,然后针对这些问题提出了优化思路,通过智能网SMP设备硬件和软件能力挖潜、优化业务流程、开启动态多进程处理机制,较好的满足了突发性业务批量开通需求,有效提升了智能网业务的支撑能力,为市场的业务发展需求提供了保障。     

Pluggable SDN framework for managing heterogeneous SDN networks

Software‐defined networking (SDN) is a new network paradigm that is separating the data plane and the control plane of the network, making one or more centralized controllers to supervise the behaviour of the entire network. Different types of SDN controller software exist, and research dealing with the difficulties of consistently integrating these different controller types has mostly been declared future work. In this paper, the Domino framework is proposed, a pluggable SDN framework for managing heterogeneous SDN networks. In contrast to related work, the proposed framework allows research into SDN networks controlled by different types of SDN controllers attempting to standardize the northbound API of them. Domino implements a microservice plugin architecture where users can link different SDN networks to a processing algorithm. Such an algorithm allows for, eg, adapting the flows by building a pipeline using plugins that either invoke other SDN operations or generic data processing algorithms. The Domino framework is evaluated by implementing a proof‐of‐concept implementation, which is tested on the initial requirements. It achieves the modifiability and the interoperability with an average successful exchange ratio of 99.99%. The performance requirements are met for the frequently used commands with an average response time of 0.26 seconds, and the framework can handle at least 72 plugins simultaneously depending on the available amount of RAM. The proposed framework is evaluated by means of the implementation of a shortest path routing algorithm between heterogeneous SDN networks.     

Integrated service creation environment for open network services

The service creation scheme is changing with the advent of open network service architecture for next-generation network. New requirements should be considered for IT domain developers to create telecom and Internet combined services more easily. This paper describes an integrated service creation environment (SCE) to reflect the trend of network evolution toward an open network environment. The SCE provides multiple service programming tools to support various users’ background, a mash-up toolkit for IT domain, a simulation-based validation tool, a run-time adaptation tool, and a personalized service provisioning environment. Several example services were implemented to verify the features of an integrated SCE. Our approach is very promising because it supports various requirements and background of service developers on the full service creation process. Furthermore, it provides a means for personalized service creation driven by end-user, which is a new trend of future network.