GPON技术在新疆移动宽带接入网中的应用

当前,我国正在积极推进网络基础设施建设,而新疆地处西北边境地区,地域辽阔,建设场景多样,建设成本较高,需要一种针对性较强的设计方案。文中从GPON网络的基本概念及原理入手,讲解了GPON网络的关键技术及设计关键,并针对不同的宽带业务需求场景,提出了不同的宽带接入设计方案。     

Narrowband and broadband infrastructure design for wirelessnetworks

There has been an explosion in the number of wireless subscribers. A number of air interface technologies, such as GSM, TDMA and CDMA, are available to wireless service providers for offering wireless services. In addition, a variety of networking technologies, such as STM, ATM and frame relay, are available to the wireless services provider for designing their infrastructure networks. The abundant choice of technologies, and their associated capabilities and costs, creates a need for network design tools which can help vendors and wireless service providers to understand the economics of investing in different technologies. This article is concerned with the design of narrowband and broadband infrastructure networks for wireless access. The article first describes the different technology alternatives and tariff structures and their impact on wireless infrastructure network design. The general infrastructure design problem is then stated and a solution methodology outlined. Examples of the economic trade-offs involved in narrowband and broadband networking technologies are also presented     

运营商共享FTTH光纤宽带接入网的建设模式分析

介绍了一种由宽带基础设施运营商统一建设并运维光纤宽带接入网的模式,阐述了多个宽带业务运营商共享接入网的建设方案,分析了该模式在规划建设和运维方面的优缺点,提出了接入网未来网业分离的可能演进方向。     

SingAREN: the Singapore Advanced Research and Education Network

Singapore is the first country in the world to have a nationwide broadband network infrastructure deployed. What started as an experimental ATM testbed network in 1995 has now become a nationwide broadband infrastructure called Singapore ONE, launched in 1997 to provide residential broadband access via ADSL or CATV cable modem technologies, and business access via ATM. As of June 1998, Singapore ONE supported more than 10,000 users with over 120 commercial applications. More than 100,000 users are projected by the end of 1999, increasing to 400,000 by the year 2001. In order to support the technological needs of broadband communications under Singapore ONE, and to address the national R&D agenda in this area, an advanced research network called the Singapore Advanced Research and Education Network (SingAREN) was established in late 1997. This article gives an overview of the broadband infrastructure initiatives in Singapore, focusing on the SingAREN project. The goals of SingAREN, its network configuration, the research programs and activities to date, and plans for the future are described     

HFC Access Network Design for Switched Broadcast TV Services

The hybrid fiber coax (HFC) is a modern broadband access network, providing advanced interactive services such as Internet access, digital interactive television and cable telephony. The edge costs dominate the cost of launching new services, at the time of deployment (CapEx) as well as for maintenance (OpEx). Therefore next-generation edge devices aim at the convergence of these services and their platforms into a single multi-service infrastructure, thus sharing resources and bandwidth. The focus of this paper is on the HFC access network design for bandwidth-intensive TV services, bringing standard as well as switched broadcast technologies into play. Standard broadcast TV service deployments, offered through the digital video broadcast (DVB) platform, require low installation costs, but the bandwidth consumption increases linearly with the number of available TV channels, even for very unpopular channels. Switched broadcast TV channels, offered on the (Euro-) DOCSIS platform together with other interactive unicast services such as video on demand, are only streamed to a node on the HFC access network if they are requested locally, thus limiting bandwidth consumption for less popular channels. We present an access network design tool, based on an analytical TV traffic model, minimizing the installation cost on the edge devices and study the influence of the most important traffic and content parameters.     

Multiservice access network upgrading in Europe: a techno-economicanalysis

The article presents a techno-economic evaluation of strategies for developing the traditional access network along a cost effective path toward a future-proof multiservice broadband network. A broad range of appropriate network alternatives have been assessed for each of five representative European upgrade cases. The technological options that have been evaluated range from conventional copper-based networks to emerging new technologies such as hybrid fiber coax networks and ATM-based broadband passive optical networks. The techno-economic assessment was carried out by the Eurescom P306 project “Access network evolution and preparation for implementation”, using the methodology and tool developed within the RACE 2087/TITAN project. The scenarios studied include gradual provisioning, from 1995 to 2005, of services like POTS, N-ISDN, asymmetric switched broadband, symmetric switched broadband, and broadcast broadband. The demand forecasts for the selected bearer services are extracted from a European Delphi survey, also carried out within TITAN. The quality of the existing infrastructure, the average subscriber capacity demand, and demography are among the key elements likely to affect the economic viability of access network upgrade strategies     

Regulation,investment and efficiency in the transition to next generation broadband networks: Evidence from the European Union

This article explores the impact of public policy on technological change and the development of broadband infrastructure in EU member countries. The analysis explores contradictory findings in previous empirical literature on the interplay between regulation, competition, and investment, noting the importance of the construction of indicators employed to evaluate these interactions. Furthermore, the article points out that the traditional policy model and related empirical literature treat fixed capital inputs in networks as a measure of broadband infrastructure quality. However, relatively higher capital inputs do not necessarily translate into the development of relatively higher quality broadband networks. Using broadband network performance measurements between 2007 and 2012, the article addresses this contradiction in the literature and evaluates the determinants of broadband infrastructure quality in the EU. The analysis suggests countries that have been more effective at promoting entry and competition in the provision of Internet access services have developed relatively higher quality broadband networks.     

宽带接入网建设必须关注的几个问题

本文主要阐述宽带接入网建设中,必须考虑投资成本与收益回报的协调、服务对象与建设标准的确定、宽带网业务与互联网业务的区别等问题,并且要合理利用现有网络的基础设施,使宽带接入网平滑演进,既能满足现阶段服务对象的需求,又具备升级发展的潜力。     

Terminal-to-network communication in an ATM-based ISDN

This paper addresses the topic of signalling and connectionless data transfer virtual channels in ATM at the UNI. It recapitulates on the access signalling support in narrowband ISDN, as a representative of an STM network and the predecessor of the coming broadband ISDN. Also, the influence of the customer premises network architecture is taken into account. From there, it is investigated in which ways these principles can be extended, into a general access infrastructure and access configuration management for signalling and connectionless services in the ATM-based broadband ISDN. Some possible implications for the internal architecture of the CPN and the network are discussed. This brings some insight into the restrictions which standardization of these principles at the UNI may bring along for the architecture.     

A millimeter wave broadband wireless access technology demonstratorfor the next generation Internet network reach extension

We report design and implementation scenarios for a gigabit-capacity and high-data-rate fixed wireless access technology demonstrator. The system is based on a broadband wireless access concept and implementation techniques utilizing millimeter-wave and newly introduced free-space optical wireless high-speed links. The demonstration platform is to provide broadband “last mile” access and networking solutions to Internet users in densely populated areas with homes and businesses (e.g., building-centric and inner city environments) in need of high bandwidth not served by the fiber infrastructure. The investigation focuses on the radio link design, network architecture, system integration, and a compatible interface to the existing ATM fiber and satellite core networks in support of the next-generation Internet (NGI) reach network extension by the wireless technology     

室外Wi-Fi网状网在农村的发展和应用

基于Wi-Fi的室外无线网状网因具有高带宽、低价格、可扩展、易维护等优势.近年来在热点覆盖、无线城市等领域的应用迅速发展,其低成本优势也使室外无线网状网成为农村无线宽带覆盖的最有竞争力技术之一.中国科学院计算技术研究所在北京怀柔区渤海镇北沟成功地建设了一个覆盖130多个用户的无线网状网.本文讲述在建设中遇到的问题与积累的经验,以及关于建设宽带Wi-Fi乡村的技术和商业问题的探讨.由于用户需求的刚性,作者认为在农村发展宽带无线网络比无线城市更有优势.     

Cost analysis for switched star broadband access

This paper presents a first cost analysis of a broadband local access system based on the switched star architecture. The per-subscriber cost, including all network components from the customer premises interface to the central office switch termination, is established. Both near-term and long-range per-subscriber costs based on technology trend forecasts are obtained and serve as a bench-mark. These results are used for comparisons of the relative costs of offering different broadband access capabilities. The analysis identifies the most important elements in the per-subscriber cost and explores trade-offs and possibilities for cost reduction.     

Wireless LAN access network architecture for mobile operators

The evolution of IP-based office applications has created a strong demand for public wireless broadband access technology offering capacity far beyond current cellular systems. Wireless LAN access technology provides a perfect broadband complement for the operators' existing GSM and GPRS services in an indoor environment. Most commercial public wireless LAN solutions have only modest authentication and roaming capability compared to traditional cellular networks. This article describes a new wireless LAN system architecture that combines the WLAN radio access technology with mobile operators' SIM-based subscriber management functions and roaming infrastructure. In the defined system the WLAN access is authenticated and charged using GSM SIM. This solution supports roaming between cellular and WLAN access networks and is the first step toward an all-IP network architecture. The proto-type has been implemented and publicly verified in a real mobile operator network     

The Broadband Access Facility

The deployment of broadband access networks will revolutionise many aspects of society in the early years of the next millennium. Manufacturers, telecommunications providers and cable television operators world-wide are investing heavily on research into networks that provide broadband multimedia services to customers. BT has developed a prototype of a full service access network that can connect customers via optical fibre, digital subscriber line or radio technologies. This paper describes the physical implementation of the prototype network and the wide range of services that it can support.This prototype network, referred to as the 'broadband access facility' is enabling BT and its partners to understand the best access architectures for a given environment through practical testing. The network now serves as an experimental platform, that can be used for communicating broadband concepts, designing operational processes, developing management solutions and testing advanced applications.The full service access networks (FSAN) initiative is a collaboration involving fourteen of the world's leading telecommunications network operators and major equipment manufacturers. Its vision is to create a shared requirements specification for access systems supporting narrowband and broadband services. This common specification will mean that broadband network components can be developed for world markets, thus raising volumes and driving down unit costs. The common system specification is based around an ATM/SDH (asynchronous transfer mode/synchronous digital hierarchy) core network, with local optical fibre distribution via an ATM PON (passive optical network). DSL (digital subscriber line) systems maximise reuse of existing copper plant. The exact DSL system used depends upon where the optical system is terminated, e.g. in the local exchange, cabinet, kerb or home. Hence this broadband access system can support a range of access architectures — this flexibility is fundamental to the consensus achieved in FSAN.     

Broadband ISDN technology and architecture

Broadband integrated services digital network (BISDN) network architecture for local public serving areas is described. It is designed to offer end-users access to bandwidths up to 155 Mb/s. The BISDN protocols described support the simultaneous delivery of voice, data, image, and video services to business and residential customers. The objective of the broadband architecture described is to suggest designs that can evolve from today's base of narrowband equipment toward BISDN. It supports the use of fiber for narrowband services, in order to ensure that a broadband infrastructure is in place to serve as a platform from which broadband services can be offered. It also uses optional broadband modules on existing narrowband systems to facilitate evolutionary growth of broadband services and recognizes the metropolitan area network (MAN) protocol defined by IEEE 802.6 as a possible early implementation of BISDN     

Wireless broadband communications: some research activities inSingapore

Almost a decade ago, Singapore started crafting and implementing its IT2000 master plan to transform the city-state into an information-technology-based intelligent island. Since 1997, the main infrastructure of a high-speed ATM-based backbone network, called SingaporeONE, has been in place along with a host of commercial and governmental application service sites providing a plethora of online services. Because of its small size and extensive wired infrastructure, broadband access to homes and offices is currently provided via ADSL and cable modems. There is, however, interest in the use of wireless broadband communication technologies to access SingaporeONE, motivated primarily by its lower cost and faster deployment. In this article we describe some of our R&D activities motivated by the above interest to provide wireless broadband access to SingaporeONE. Specifically, we describe our study of LMDS, and the design and development of a wireless ATM LAN     

Local loop unbundling in the Italian network

Unbundling consists of the possibility for a new operator to have special access to an incumbent's network infrastructure in order to provide value-added services without the necessity to duplicate the infrastructure itself. Local loop unbundling has received the most attention in Europe and in Italy. Most Italian operators are interested mainly in physical access to copper loop, which gives the opportunity to offer broadband services pervasively by exploiting the capabilities of xDSL technology. Technical issues to be faced in offering these services are severe and include loop qualification, interference evaluation, and shortage of available loops. Nonetheless, the Italian case, where more than 20 incoming operators are planning to deploy services on unbundled local loops, demonstrates that this opportunity can be a major driver for the development of the broadband services market.     

Broadband public network and switch architecture

The authors present a view of public network and switch architecture evolution to broadband capabilities, driven by the applications evolutions and built on a synchronous fiber transmission infrastructure such as SONET (synchronous optical network). The scenario is based on the partitioning of broadband network functions between synchronous fiber transmission systems and cell-based transport. The first stage of evolution incorporates frame-based switching to support increasing data traffic for LAN (local area network) interconnections. Cell-based technology appears first in the form of point-to-point high-speed data trunks and then as switched high-speed access. Centralized cell switching will provide interconnect between cell-based trunks and shared access lines. Remote cell multipliers will provide traffic concentration when the number of customers further increases. Since cell transport will first be introduced in the network as an extension of frame transport to higher speed, interworking between cells and frames will be necessary     

Interoperability between WiMAXand broadband mobile space networks [topics in radio communications]

In several countries manufacturers, operators, and public authorities look at WiMAX system as a viable technology to fill the "digital divide," providing broadband services mainly in suburban and rural areas, but also in densely populated areas. Nevertheless, as a standalone system it will never offer global services, and to complement its capabilities, the utilization of broadband space-based access shared among users represents a scalable and cost-effective solution to offer wider area coverage, improved performance in terms of QoS, service continuity in case of terrestrial network failure, and long-range user mobility. Integration between WiMAX and a space-based infrastructure, composed of a combination of satellites and high altitude platforms, can be pursued in several ways. The simplest solution is based on connecting a WiMAX network by means of a terrestrial network terminating at a hub station connected to the space infrastructure. A more flexible solution should allow the WiMAX subscriber station or base station to directly access the space infrastructure. This article addresses the identification of suitable scenarios and a feasibility analysis presenting link budget results related to a subset of the identified solutions.     

Access to broadband Internet and labour force outcomes: A case study of the Western Downs Region,Queensland

This paper examines the causal effect of household access to broadband Internet on individuals’ labour market outcomes in an Australian rural and regional context. This study uses the survey data of 391 households randomly selected from the Western Downs Region of Queensland, Australia, and employs the propensity score matching technique to make causal inferences. This study also controls selection bias issues – an aspect which has been overlooked in previous studies. This study found that the causal effect of household access to broadband Internet on individuals’ labour force outcomes is not statistically significant. This finding can add value to our knowledge of the causal relationship between broadband access and labour force participation. As the rollout of a high-speed broadband network in rural and regional Australia is currently underway, the finding can be considered a benchmark for subsequent assessment of the effects of such infrastructure development on socio-economic outcomes.