Forecasting user demand for wireless services: A socio-economic approach for Europe

This article reports the findings of a study for the European Commission to forecast demand for mobile communications services up to 2020. The study used a socio-economic approach including scenarios to explore the future and an original methodology for estimating traffic volumes under different socio-economic conditions. This article describes the objectives, outlines the methodology and summarises the results of the study. The study’s findings lay the foundation for a European consensus for calculating future spectrum requirements and are an important part of the process in the lead up to the World Radiocommunication Conference in 2007.     

A framework for delivering fine granularity and fair service discrimination in DiffServ networks

In order to achieve a quality of service (QoS) capable of satisfying an ever increasing range of user requirements, differentiated services (DiffServ) have been introduced as a scalable solution that emerges ‘naturally’ from today's best effort service approach. Mapping the packet treatment into a small number of per hop behaviours (PHBs) is the key idea behind the scalability of DiffServ but this comes at the cost of loosing some behavioural differentiation and some fairness between flows multiplexed into the same aggregated traffic. The paper proposes a novel simple and effective DiffServ approach, the ‘Simple Weighted Integration of diFferentiated Traffic’ (SWIFT), and uses it in a series of simulations covering a relatively wide range of local network conditions. Measured voice and video traffic traces and computer generated self‐similar background traffic were used in simulations performed at various congestion levels and for in‐profile and out‐of‐profile source behaviour. The resulted throughput, mean delay, maximum delay and jitter are used to asses SWIFT's capabilities—isolation of the in‐profile traffic from congestion effects, treatment differentiation, increased resource utilization, fairness in treatment under congestion, and incentivity for nice behaviour. Comparisons with other approaches employing traffic control are also provided. Copyright © 2003 John Wiley & Sons, Ltd.     

基于多Agent的移动信息服务支持系统

随着我国移动通信的迅猛发展 ,用户对于移动增值业务的需求越来越高。如何建立一个高效的移动增值业务服务支持系统 ,并保证移动增值业务的服务品质 ,是一个急需研究和解决的重要课题。本文针对这一问题 ,从系统体系结构的角度提出了一种多 Agent移动信息服务支持系统。该系统提供了可以高效地配置与管理信息类移动增值业务的系统解决方案 ,尤其适用于主动式高级信息服务类增值业务。这一系统结构适应性强、易扩展、易维护 ,并能够更好地支持对用户的个性化服务。该系统具有广泛的应用前景 ,对于未来 3G的增值业务具有一定的参考价值     

Cost-Effective Migration from Sub-Lambda to Wavelength-Based Metro Networks

This article will discuss the importance of hybrid coexistence of sub-lambda grooming with wavelength-based services for driving down costs and maximizing the use of metro bandwidth, as well as enabling next-generation lambda-based services. The article will also address migration to all optical metro networks.     

医院医疗服务质量管理的灰关联分析

将灰关联分析方法应用于医院管理年活动中,分析了影响医疗服务质量的相关因素,并对医院医疗服务质量进行综合评价.     

Unique Features of Mobile Commerce

While the market potentials and impacts of web-based e-commerce are still in the ascendant, the advances in wireless technologies and mobile networks have brought about a new business opportunity and research attention, what is termed mobile commerce. Commonly, mobile commerce is considered to be another new application of existing web-based e-commerce onto wireless networks, but as an independent business area, mobile commerce has its own advantages and challenges as opposed to traditional e-commerce applications. This paper focuses on exploring the unique features of mobile commerce as compared with traditional e-commerce. Also, there are still some limitations arisen in m-commerce in contrast to web-based e-commerce. Finally, current state of mobile commerce in Japan is presented in brief, with an introduction of several cases involving mobile commerce applications in today's marketplace.     

下一代网络的业务模型和提供技术

文章在简要叙述业务驱动网络发展趋势的基础上,介绍了基于价值链的NGN业务商业模型和基于开放式分布计算的业务模型,详细分析了NGN的主要业务提供技术,并就NGN进一步的研究方向提出了看法.     

Closed queueing networks with batch services

In this paper we study queueing networks which allow multiple changes at a given time. The model has a natural application to discrete-time queueing networks but describes also queueing networks in continuous time. It is shown that product-form results which are known to hold when there are single changes at a given instant remain valid when multiple changes are allowed.     

Providing and verifying advanced IP services in hierarchical DiffServ networks‐the case of GEANT

The differentiated services (DiffServ) framework is widely proposed as an efficient method for providing advanced IP services to large‐scale networks, with QoS requirements. However, the provisioning of such services in production networks has proved to be more difficult than initially expected, in defining, setting and verifying appropriate Service Level Agreements (SLAs). GEANT, the Gigabit core pan‐European research network, on a pilot basis introduced ‘Premium IP’ service, offering bounded delay and negligible packet loss to the European National Research & Education Networks (NRENs) that it interconnects. However, large scale provisioning of this new service requires the definition of efficient interaction procedures between administrative domains involved and methods for SLA monitoring. This paper focuses on these issues and presents the experience acquired from the early experiments in GEANT, as an example of hierarchical Gigabit multi‐domain environment, enabled with QoS provisioning to its constituent NRENs. This model scales more efficiently than the common peering Internet Service provider (ISP) commercial paradigm. Finally, we outline other options that promise QoS, such as Layer 2 VPNs in MPLS backbones, with non‐standard (yet) mechanisms. Copyright © 2004 John Wiley & Sons, Ltd.