OA&M for full services access networks

A number of network operators and suppliers have collaborated in the full services access network (FSAN) initiative to agree on a common set of requirements for broadband networks. This article presents the OA&M requirements that have been considered by the OA&M working group with a view to reducing equipment and operational costs. In considering OA&M costs it is necessary to take into account both equipment costs and operational costs. The main principles presented for minimizing OA&M costs are: the use of standard interfaces and information models where possible; minimizing the need for special operational skills and maintenance tools; provision of accurate maintenance information by the system; promoting reuse by locating complex functions at common points to enable sharing of platforms; provision of functions for locating faults and detecting network degradation; and the need to build in the ability to evolve and upgrade the network and its management capability     

Hybrid transport solutions for TDM/data networking services

There is a growing demand for native data transport services for enterprises and corporations across public transport networks. Equipment vendors have begun to incorporate a variety of LAN and storage area network interfaces, notably Ethernet, Fibre Channel/FICON, and ESCON, on traditional metro and long-haul transport equipment. Embracing Ethernet and SAN technology enables the introduction of flexible high-capacity transport services optimized for data networking. Transport operators may thus offer both enterprise-centric connectivity services, such as transparent LAN connectivity and virtual LAN services, as well as traditional bandwidth services, such as private lines, while preserving the operations and management infrastructure of the existing public networks. We discuss the benefits of a hybrid Ethernet/TDM transport solution     

基于TR-069协议的家庭网络设备远程管理的研究

家庭网络承载着众多的电信业务,为保证电信业务端到端的服务质量,运营商要对端到端通信的终端设备进行协调统一管理.结合无源光网络EPON和TR-069管理体系协议,论述一种基于该协议的家庭网络设备的远程管理方法,研究表明TR-069协议相比于传统的SNMP协议减少了运维成本,在广域网的管理协议中具有更大的发展前景.     

Operations and maintenance centre — delivering network services

Network management, administration and maintenance activities have developed dramatically since the introduction of digital exchanges, with their ever-increasing capabilities for remote interrogation and control. The operations and maintenance centre (OMC) was born to exploit the exchange capabilities and fulfil the need for fast and efficient centralised administration and maintenance facilities. This paper describes and traces the development of the OMC, outlines its key role and achievements in the delivery of network services in pace with on-going requirements, and investigates the technical challenges being addressed as part of its evolutionary design.     

Towards successful VoLTE and VoWiFi deployment: network function virtualization solutions’ benefits and challenges

The Recent decades have witnessed intensive efforts from operators to implement methods enabling better control over network utilization, service usage, and service monetization. Nevertheless, they report significant growth in Diameter signaling traffic, especially policy management signaling traffic. More specifically, operators offering long term evolution (LTE) data-only services and planning for a massive introduction of voice over LTE (VoLTE) and voice over WiFi (VoWiFi) services need to tackle the enormous growth in Diameter signaling traffic. The biggest challenge for those operators is to find an appropriate solution, scalable enough to handle the unpredictable growth of Diameter signaling traffic; as the VoLTE and VoWiFi services will reshape the landscape of LTE policies. Throughout this paper, we propose a network function virtualization (NFV) based model, mature enough to tackle the challenges of those operators planning to launch VoLTE and VoWiFi, without impacting existing services and without jeopardizing current revenues. In our approach we first used standard VoLTE and VoWiFi message flow and referenced users’ behavior; then we considered NFV architecture characteristics. We finally referred to the latest experiments and test results related to NFV maturity cycle.     

自组织ZigBee网络节点通信研究

对自组织ZigBee网络的原理进行了研究,并抓住其精髓进行了剖析,给出了自组织ZigBee网络节点通信流程和软件流程。自组织ZigBee网络每个节点只和其邻近节点通信,从一个节点发出的数据包将根据相关协议的配置多跳传递到目的节点。网络中的每台设备都可直接通信,或者通过网络的转发而连接到其他设备。每个网络节点都具有选路功能,如果其中的某一条链路出现了故障,节点便可以自动转向其他可选链路进行接入,因而减轻了业务执行时发生冲突的可能性。自组织ZigBee网络的研究,对网络中的资源节俭,网络的维护与操作,升级与扩容有着指导意义。     

Value optimization of survivable multilayer IP/MPLS-over-WSON networks

Network operators are willing to provide a range of services in the hope of maximizing their profits: from the highly available connectivity services for key business customers to the unprotected or even best effort services for residential customers. These services are being provided through IP/multiprotocol label switching (MPLS) over wavelength-switched optical networks (WSON) networks. Such multilayer network enables the application of optimal load balancing between the packet and the optical layer, optimizing both the cost of the packet layer and the utilization of the WSON. To provide highly available services, redundant network resources need to be added to the network providing survivability against failures; generally speaking, the higher the survivability degree, the higher both the capital and the operational expenditures (CAPEX and OPEX, respectively) of the network. In this work, we design networks to meet specific availability objectives considering single failures in optical links, IP/MPLS nodes, and optoelectronic ports. The benefits of the designed networks are evaluated from an economic perspective defining costs and revenues models and using Net Present Value as a metric to evaluate future cash flows after an investment. To this end, CAPEX and OPEX, including power consumption and maintenance, and penalties as a consequence of service level agreement breaches are considered. Exhaustive numerical results on several reference network scenarios demonstrate how the value of the network can be maximized by tuning availability objectives.     

Fixed access network technologies

Telecommunications operators around the world are facing flat or declining revenues in their traditional services and expanding commercial and political demand for ubiquitous broadband access. This creates two opposing pressures — to cut costs radically and to invest heavily in new technology. The traditional fixed access network is central to both of these issues and this paper describes the technology that is being developed to meet these challenges.     

Fixed Access Network Technologies

Telecommunications operators around the world are facing flat or declining revenues in their traditional services and expanding commercial and political demand for ubiquitous broadband access. This creates two opposing pressures — to cut costs radically and to invest heavily in new technology. The traditional fixed access network is central to both of these issues and this paper describes the technology that is being developed to meet these challenges.     

基于内容分发的卫星网络

随着宽带业务的蓬勃发展,利用广播网络传送各种内容变得更为流行,卫星通信运营者面临巨大的机遇,他们可以把原有网络转变为传送大量新的强业务的多用途平台。文章阐述利用现有卫星技术和设备实现内容分发的方案,分析利用卫星网络进行内容分发的优势和要求,介绍卫星分发平台的组成和应用。     

Multi-rate ISDN

Multi-rate integrated services digital network (ISDN) is a new technology for providing dialed-up, circuit-switched, isochronous communications for bandwidths from 128 kb/s to 1.536 Mb/s (DS-1) or 1.920 Mb/s (CEPT-1). Multi-rate ISDN provides a simple way to extend ISDN network services to match the higher bandwidth requirements emerging for videoconferencing, multimedia, imaging, and other high-speed applications. Using this technology, network service providers can offer high-speed connectivity within the boundaries and benefits of existing, circuit-switched, central office and transmission equipment. Only minor changes are required in the operations administration and maintenance and provisioning (OAM&P) procedures associated with multi-rate ISDN, versus existing ISDN transmission and central office maintenance procedures     

Network management for residential broadband interactive dataservices

Although coaxial networks and hybrid fiber coaxial (HFC) networks have been in use for delivering television programs to the home, their usage as access networks to provide broadband interactive data services (BIDS) to the home is very recent. In this article, the authors highlight the importance of managing the networking infrastructure for BIDS and explore the unique requirements and challenges in managing HFC networks. Considering the operational requirements of BIDS operators, network maintenance, subscriber support, and planning are identified as the three functional areas that a BIDS network management system must address. It is argued that management support built into BIDS equipment (e.g., cable modems, headend cable termination units, subscriber PCs) can provide a cost-effective way of monitoring the status and performance of HFC networks, and some initial experiences of implementing and deploying network monitors in a real-world BIDS system are presented     

电信运营商NFV未来网络管理体系演进关键问题

网络功能虚拟化(NFV)是电信级业务云化的核心技术和架构,是未来网络演进的必然趋势.NFV给通信网络带来了新的能力,同时也要求对现有的设备运行、管理、维护和配置模型增加新的管理和编排(MANO)功能.首先对物理网元的网管体系架构及未来演进规划进行总结研究,然后对NFV的引入对现网设备管理方式的变化及新网管架构功能进行总结,深入研究NFV MANO与运营支撑系统(OSS)协同关系、MANO与其他周边网元组网方案等关键问题,最后从电信运营商角度,基于NFV MANO解耦程度,提出MANO部署及演进策略.     

An approach to the cooperative management of multitechnologynetworks

This article presents a TMN-compliant X interface, the so-called Xcoop interface, as a fundamental component of an operations system developed to cope with the challenges of multidomain, multitechnology networks. Defined at the network level, between operations systems of different TMN domains, it is intended as a support for the management of broadband connectivity services with end-to-end QoS and scheduling constraints in backbones operated by many network operators. The key feature of the present approach, distinguishing it from other existing Xcoop solutions, is in handling the integrated ATM and SDH technologies, covering both the configuration management and fault management functional areas     

下一代无线业务对运营管理及计费模式的影响

下一代无线业务在帮助服务提供商创新业务模式和增强盈利能力方面发挥着十分重要的作用、而无线通信技术的推陈出新不仅为服务提供商创新收益模式提供了良好的运营环境，而且还将使运管商现有的业务运营方式得到根本性的改观。为此，服务提供商需要对运营领域中的一系列关键问题给予高度的重视。除此之外．运营商还应充分认识到在下一代无线数据业务运营中多种计费模式的并存这一主流发展趋势并根据用户的需求及时采纳和制定各种灵活的计统费模式。     

Standards as an Enabler for Next Generation Networks

The recession in the telecommunications industry has meant that the traditional telecommunications operators (BT, AT&T, FT, etc) have found it difficult to provide the resources needed to participate effectively in the standards process. Thus, they are not influencing international standards to get what is needed to build the next generation of telecommunications networks. This could mean that the introduction of new services is delayed and that customers may have to pay more for their services than is necessary. A clear priority now is to re-engage operators in standardisation so that the equipment needed to build next generation networks (NGNs) is standardised to operator requirements. This is the only way to get network build costs down to a level where operators can afford to install it. This paper looks at ways of achieving this goal.     

集约化宽带服务智能运维体系构建方法

随着宽带提速战略的推行和IPTV/OTT等视频类流媒体业务的迅速发展,用户对运营商网络服务体验的要求不断提升,现有分层、分段、缺乏关联的运维体系和方法已不能满足新形势下的网络运维工作需求.以流媒体业务为聚焦点,提出一套在宽带IP网内基于“端到端网络质量监控”和“故障自诊断功能”构建集约化宽带服务智能运维体系的方法,以期对运营商网络运维工作的效率及智能化水平的提升有所助益.     

Strategies for provisioning and operating VHE services inmulti-access networks

Providing advanced services over multi-access networks is a challenging issue for service providers as well as for network operators. This article presents a framework for provisioning virtual home environment services dealing with these issues. We evaluate ongoing standardization activities in this area, and propose strategies suitable for deployment, and operating associated systems and services     

面向用户感知的LTE网络评估模型的设计与实现

随着数据业务的飞速发展以及智能终端的快速普及,如何评价并提高用户体验已成为当前网络优化、未来网络设计的重点.基于此,提出了一套面向用户感知的LTE网络评估指标体系,并采用层次分析法、变异系数法,建立了以用户感知为核心的LTE网络评估模型.最后,以重庆某小区实测数据为例,对该小区数据业务性能进行评估,并给出了直观的分析评估结果.     

Local access optical networks

Both broadcast CATV and switched telephony access networks have evolved, over decades, to deliver their respective services efficiently. But these networks are not necessarily optimal for services that are rapidly emerging. This suggests that the access infrastructure will likely change in the future, driven by demands for new services and the costs of providing them. Will fiber optic networks play an important role? Trade-offs in desirable network properties (low initial costs, high capacity, flexible provisioning, enhanced maintenance and operations, etc.) are strongly influenced by the network architecture. We classify architectures on two characteristics: delivery mode (i.e., broadcast vs. switched) and carrier utilization (i.e., shared vs. dedicated), examining the trade-offs these imply with several examples of existing and proposed architectures. We show that optical networks can, by virtue of recent component development, be reconfigured to change their characteristics without changing the outside plant