Communications network planning in the evolving information age

Communications networks are undergoing major changes in equipment technologies, network architectures, and service offerings. These changes reflect the new capabilities of the evolving information age: high bandwidth technologies, flexible and controllable networks utilizing advanced database and signaling systems, and intelligent network elements. Planning these new communications networks presents a major challenge. However, information age technologies also allow the design of efficient and flexible processes and systems to plan new modern networks. In fact, these new database oriented, intelligent planning systems must evolve in synchronism with the new information age communications networks. In the long term, as the networks increase in flexibility and intelligence, the networks themselves can take over many of the responsibilities of network planning and administration, leaving planners to study business strategies and new network architectures and services. In any event, planning decisions, whether made by the network or the planner, will be based on large amounts of information that are efficiently organized and quickly processed by the integrated network and operations support systems.     

全IP移动网热点问题研究

移动网与固定网存在大量共同的技术,因此,在讨论移动网的核心网和业务网时,可以与固网结合起来讨论.在全IP移动网的核心网方面,文章认为:由于采用了不面向连接的工作方式,简化了信令,克服了节点设备复杂化以及与传送网技术的发展相匹配,IP网将是全IP移动网的核心网.在全IP移动网的业务网方面,文章认为:因为电路交换网与分组交换网网络特性的差别,全IP移动网的业务网设计应当有别于目前简单的映射电路交换网的业务网设计,应该符合分组交换网网络特性,因此,从商业模型出发,对业务网与承载网相分离的说法需要重新审视.     

Designing Hybrid SONET and DWDM Networks

To take full advantage of SONET granularity and DWDM capacity, the two technologies must be combined to enable deployment of the most economic transport networks. The emergence of integrated SONET and DWDM platforms is also part of the effort to build a hybrid network to achieve this objective. It then poses a new challenge to network designers in designing networks mixed with MSPP, ROADM, and integrated platforms. This article provides guidelines on recognizing different types of hybrid networks and how to accomplish the design task by using existing design tools or procedures     

Advances in data networking

This paper highlights the current approach to large-scale internetwork design using today's network layer routeing protocols. It describes how large internetworks can be constructed to provide stability, resilience and scalability, together with a set of best practice design guidelines for those involved in the design of large data networks, highlighting the key issues to be considered. The paper looks at how new technologies are likely to enhance this design approach, in particular, how the full potential of cell switching can be realised through emerging technologies such as integrated switching and routeing. The paper concludes that the model proposed for large-scale networks based on current routeing protocols and technologies can be enhanced to make optimum use of switched WAN services such as ATM, through the use of newer routeing technologies.     

Toward management systems for emerging hybrid fiber-coax accessnetworks

Advances in networking and hardware are motivating the development of high bandwidth local access networks that connect subscriber communities to the Information Superhighway. Hybrid fiber-coaxial (HFC) technology is emerging as one of the few economical viable technologies for designing new local access networks. These HFC local access networks are expected to support a variety of services in different spheres in an integrated manner, by drawing upon diverse technologies from the cable, computer, and telecommunications industries: the tree-and-branch network topology is typical of the cable network; intelligence in the end devices is a characteristic of the computer industry; and addressability, global interconnectivity, and quality of service (QoS) are characteristic of the telecommunications industry. It is this combination of diverse services and technologies that poses fundamental challenges in architecting a management system for HFC networks. The design of a management framework for HFC access networks is discussed     

Advanced internetwork design — today and in the future

This paper highlights the current approach to large-scale internetwork design using today's network layer routeing protocols. It describes how large internetworks can be constructed to provide stability, resilience and scalability, together with a set of best practice design guidelines for those involved in the planning of large data networks, highlighting the key issues to be considered. The paper looks at how new technologies are likely to enhance this design approach, in particular, how the full potential of cell switching can be realised through emerging technologies such as integrated switching and routeing. The paper concludes that the model proposed for large-scale networks based on current routeing protocols and technologies can be enhanced to make optimum use of switched WAN services such as ATM, through the use of newer routeing technologies.     

Backbone Network Design and Performance Analysis: A Methodology for Packet Switching Networks

This paper describes a packet network design and analysis (PANDA) model which captures the important features of different packet technologies. This model evolved from many iterations with technology developers and network planners over several years. The main contribution is a methodology for designing low-cost backbone packet networks with satisfactory performance which is both practical and useful. This methodology is useful for investigating cost/performance tradeoffs of various network capabilities and components, thus providing a means for identifying potential cost and performance bottlenecks for different packet technologies and to guide capability requirements for new technologies.     

Protection cost evaluation of WDM-based next generation optical access networks

New technologies and advanced network devices make it possible to move towards high capacity access networks able to satisfy the growing traffic demand. Wavelength division multiplexing (WDM) is considered as one of the promising technologies for the next generation access networks since it offers higher bandwidth and longer reach compared to the current technologies (such as time division multiplexing (TDM) based networks). However, the migration to a new technology is typically based on an overall techno-economic study which should assure the network operator that the new implementation is cost effective and profitable while able to provide the required services to the users. Another important aspect in the access network design is the network reliability performance, which can be improved by providing a certain level of protection for equipment and/or infrastructure with high failure impact ratio in order to prevent a big number of the users being affected by a single failure. The cost of protection should be carefully evaluated since providing the backup resources may be too expensive for a network operator.In this paper, we investigate the capital and operational expenditures for two next generation optical access (NGOA) networks based on the WDM technology in dense urban areas. Three scenarios with different splitting ratios are studied for each technology, with and without protection. The aim of this work is to investigate the impact of providing protection on the total cost of NGOA networks. The results show that in the dense urban areas the fibers and digging costs are highly shared among the end users but still vary according to the splitting ratios for different scenarios and the fiber layout. It also can be seen that with a proper fiber layout design, minor extra investment for protection of NGOA networks can make a significant saving on failure related operational cost and that operational expenditures depend significantly on the fiber layout.     

Dynamic composition of services for end-to-end information transport - [Service-oriented broadband wireless network architecture]

An increasing number of communication technologies in access and core segments of the network belonging to different providers and subject to different network design criteria are making networks complex and difficult to manage. In such networks it is also more difficult to guarantee requested levels of quality of service. Service oriented design can be the answer to problems facing the providers of services for information transport. In this article we propose an end-to-end service composition for information transport based on principles from service oriented architecture (i.e., dynamically composing transport services with characteristics matching the requirements of a given application). SOA principles are similar to those behind the division of labor, and therefore should give providers incentive to adopt them to make better use of resources and increase revenue. As we show, some SOA concepts are similar to concepts in the open systems interconnection reference model, with the key advantages of dynamism and flexibility. We discuss service oriented networks based on transport service composition across access and core segments, and describe access network selection for online gaming. In particular, we show how semantic technologies can be used for layer 2 queries and discuss the advantages of using knowledge bases over traditional approaches.     

Implementing integrated and differentiated services for theInternet with ATM networks: a practical approach

This article reports on design, implementation, and preliminary experimentation of a network architecture that supports quality of service for Internet applications. It gives an overview of the various approaches toward communication networks that support application-specific degrees of QoS. Special emphasis is put on the integrated and differentiated services approaches and on combinations of them. A new architecture is described which aims to bring these concepts closer to practical realization in wide-area networks. The new architecture supports the integrated as well as differentiated services approaches in a smoothly integrated way, and uses the capabilities of an underlying ATM network to realize QoS. The enhancements to the existing network infrastructure are deliberately limited to the integration of a single new type of network element called an edge device. The potential benefits of such an architecture for various stakeholders are explained, and how the new architecture could be introduced smoothly in existing networks by small migration steps, also covering networks based on technologies other than ATM. It is shown that the approach can be scaled up to a very large QoS-aware overlay network for the Internet     

The potential of photonic networks

Simple and flexible photonic networks will provide the basic technologies for the telecommunication networks of the 21st century, broadband-ISDN, and fiber-to-the-home. It is recognized that SDH and ATM systems have much difficulty increasing the throughput by electrical signal processing technologies, such as signal processing speed, latency, and so on. Photonic networks have the potential to solve these problems and to construct ultra-high-capacity, simple, and flexible transport networks. This becomes very promising with the development of optical fiber amplifier and other new optical device technologies. This article reviews trends in optical transmission technologies and discusses the possibilities of the photonic network. Conceptual photonic network examples for the transport network, access network, and customer premises network considering the present network are shown. Future research items for constructing the photonic network are also discussed     

Guest editorial special issue on computational intelligence in telecommunications networks and internet services-part III

A variety of detailed technologies, concepts, and models aim at the realization of intelligent integrated networks and services. Active and programmable networking enable the introduction of new network services by adding dynamic programmability to network devices and making aspects of the programmability accessible to third-party vendors and users via open interfaces. Open and programmable network elements help redefine network software architectures and move control and management systems away from traditional closed and rigid solutions, bringing us one step closer to an environment where all devices and services seamlessly interoperate and cooperate with each other. Computational intelligence (CI) has emerged through a vivid and diversified synergy of technologies of granular computing, neural networks, and evolutionary computing. Each of the contributing technologies there plays an important and unique role. In essence, we can state that CI is a manifestation and implementation of a general design methodology applied to complex systems. The article reviews this special issue.     

Distributed device networks with security constraints

In today's globalized business world, outsourcing, joint ventures, mobile and cross-border collaborations have led to work environments distributed across multiple organizational and geographical boundaries. The new requirements of portability, configurability and interoperability of distributed device networks put forward new challenges and security risks to the system's design and implementation. There are critical demands on highly secured collaborative control environments and security enhancing mechanisms for distributed device control, configuration, monitoring, and interoperation. This paper addresses the collaborative control issues of distributed device networks under open and dynamic environments. The security challenges of authenticity, integrity, confidentiality, and execution safety are considered as primary design constraints. By adopting policy-based network security technologies and XML processing technologies, two new modules of Secure Device Control Gateway and Security Agent are introduced into regular distributed device control networks to provide security and safety enhancing mechanisms. The core architectures, applied mechanisms, and implementation considerations are presented in detail in this paper.     

On designing issues of the next generation mobile network

Next generation mobile network (NGMN) is envisaged to support seamless mobility across disparate access technologies in a transparent manner. The success of NGMN design will depend on its ability to address key design issues, mainly architectural adaptation and modification of service continuity functions (i.e., mobility and resource management) that arise from such interoperability. The solutions presented in this article attempt to resolve these issues by considering an IP-based interworking framework that promotes evolution of individual networks and integration of new technologies     

Optical services in future broadband networks

Optical transmission technology is progressing to the point where it can deliver data at rates that can strain conventional electronic broadband networks. We discuss how optical networks may play a role in relieving this strain. Different optical network architectures are discussed according to the services they provide, the technologies used to implement those services, and the geographical size of the network. We first discuss broadband network architectures and where optics might play a role in the protocol stack. We then discuss in detail the services optical networks can provide, the technologies used to implement those services, and some of the major technological limitations. Finally, we use this knowledge base to analyze the potential role of optics in WANs, MANs, and then local area networks (LANs)     

Incorporating QoS into IP Enterprise Network Design

Recent trends in enterprise networks are radically changing the composition of these systems. Instead of having diverse data networks, each of which is dedicated to a single class of applications, corporations are moving to a unified IP (Internet Protocol) Intranet. Traffic demands on these Intranets include delay-sensitive traffic that requires better than the standard best effort service provided by IP networks. As a result, various new technologies and strategies to provide end-to-end Quality of Service (QoS) within IP enterprise networks are being developed and implemented. However, current IP network design methodologies are limited in that they can only design networks providing best effort service or else, a single delay constraint for all traffic. In this paper, we discuss a new design methodology for IP enterprise networks that takes into account the new technologies and techniques that can provide QoS. In particular, we identify and discuss the most crucial design issues that must be addressed when specialized queuing-based QoS strategies are used in the network. We describe the new constraints introduced by the underlying technologies and discuss how these factors affect the formulation of the IP Enterprise Network Design Problem. We then describe some specific features and methodologies that have been incorporated into a network design-planning tool for IP enterprise networks with QoS.     

5G轻量化核心网总体方案研究与设计

随着全球各行业数字化转型需求的急剧增长以及5G网络标准和技术的逐渐成熟,5G行业专网成为一大研究热点。在分析了5G核心网的架构、网元功能和关键技术后,提出了5G轻量化核心网总体方案的设计,为全面赋能垂直行业,定制部署资源专用、安全可靠的本地化5G专网提供技术参考。     

Network time slot allocation in an intelligent network

The research area of telecommunications networks and services is rapidly growing, as new technologies emerge. This article proposes a design for a Time Multiplexed Switch that allocates network time slots in a telecommunications architecture. © 1998 John Wiley & Sons, Ltd.     

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     

IP/ATM integrated services over broadband access coppertechnologies

A rich set of broadband access copper technologies is available in the market today, and more are coming out of the laboratories, rapidly moving to standardization. The most likely future scenario will be one where many different technologies coexist. This multi-access-technology paradigm poses an interesting internetworking problem where interoperability and capability to support today's and future user services play a major role in the design of a network architecture. This article begins with an overview of current and new xDSL access technologies to continue describing an access network design that harmonizes the interconnection between PON, xDSL, and native ATM transport technologies. The use of ATM technology for the interface to the broadband access and transport networks is then presented and justified. The article continues studying the protocol architectures proposed for access to network service providers, considered a driver application for broadband access deployment. Finally, different protocol architectures that can provide integrated services support at the user equipment are analyzed