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Internet Service Providers (internet + service_provider)

Distribution by Scientific Domains

Information Science and Computing	57%

Selected Abstracts

Roaming and service management in public wireless networks using an innovative policy management architecture

INTERNATIONAL JOURNAL OF NETWORK MANAGEMENT, Issue 2 2005
Idir Fodil
Nowadays, public wireless local area networks (WLANs), commonly called hotspots, are being largely deployed by WISPs (Wireless Internet Service Providers) as a means of offering ubiquitous Internet access to their customers. Although a substantial number of solutions have been proposed to improve security, mobility and quality of service on the wireless area, access network management which is mandatory remains a very significant concern. This paper describes RSM-WISP, a new management architecture designed for WISPs to facilitate the implementation and management of the services they offer at the access side of the WLAN, and to manage roaming contracts between WISPs. Our architecture is based upon the policy-based management principles as introduced by the IETF, combined with more intelligence at the network edge. RSM-WISP adopts an architecture that is composed of two elements: a WISP management center (MC) that deploys policies and monitors all the WLANs, and a programmable access router (CPE) located in each WLAN. The CPE ensures service enforcement, service differentiation (access to different service levels) and guarantee, user access management, and dynamic WLAN adaptation according to the user's SLA (service level agreement). It also permits automatic service updates according to the user's requirements. Concerning roaming management, this is achieved on the CPE through multiple service provider support capabilities. This approach provides WISPs with a simple, flexible and scalable solution that allows easy service deployment and management at the access. This management architecture has been implemented, tested and validated on the 6WINDGate routers.,Copyright © 2005 John Wiley & Sons, Ltd. [source]

Analyzing the Trade-off Between Investing in Service Channels and Satisfying the Targeted User Service for Brazilian Internet Service Providers

INTERNATIONAL TRANSACTIONS IN OPERATIONAL RESEARCH, Issue 3 2002
Gisele C. Fontanella
The computer connection to the Internet is provided by firms known as internet service providers (ISPs). The simplest mode of physical connection is when the user connects to an ISP's service channel by an ordinary telephone line (dial-up). Finding an available channel may not be an easy task, especially during the peak hours of many Brazilian ISPs. This results in a problem for the ISPs, which is how to achieve the most appropriate trade-off between investing in capacity and satisfying the target user service level. This paper analyzes this trade-off based on a three-step approach: (i) determine user arrival and service processes in chosen periods, (ii) select an appropriate queueing model using some simplifying assumptions, and (iii) generate trade-off curves between system performance measures. To illustrate the application of this approach, some results derived from a case study performed at an ISP in Sao Paulo state are given. [source]

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

INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS, Issue 4 2004
Athanassios Liakopoulos
Abstract 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. [source]

The effect of physical and link layers on IP QoS

BELL LABS TECHNICAL JOURNAL, Issue 2 2003
Jeffrey H. Dunn
In the traditional Internet Engineering Task Force (IETF) network model, Internet protocol (IP) provided only an unreliable, best-effort delivery service. As a result, the effects of the physical and data-link layers on IP performance were ignored. In the current Internet service provider (ISP) environment, service-level agreements (SLA) require that IP-based services provide quality of service (QoS) guarantees. These guarantees (e.g., asynchronous transfer mode [ATM], connection admission control, and frame relay [FR] traffic policing) are often based on or enforced through physical and link-layer provisioning parameters. In this paper, we examine the effects of the ATM and FR physical and data-link layers and their interworking on IP performance. Specifically, we characterize the impact of ATM and FR impairments, traffic policing, and interworking on IP traffic. © 2003 Lucent Technologies Inc. [source]

The support of mobile internet applications in UMTS networks through the open service access

BELL LABS TECHNICAL JOURNAL, Issue 2 2001
Musa R. Unmehopa
Third-generation wireless networks are expected to enable the mobile Internet to become a reality, offering fast Internet access and high-speed data services to mobile subscribers. For network operators to allow for the rapid development of innovative value-added applications on the scale seen in the Internet today, the wireless core network needs to be opened up for third-party applications provided by independent software vendors (ISVs). The Third-Generation Partnership Project (3GPP) is currently working on the production of technical specifications to provide a mechanism that would permit ISVs a standard interface to access network capabilities traditionally available to network operators. Within 3GPP, this mechanism is commonly referred to as the open service access (OSA). This open service access is predominantly targeted at Universal Mobile Telecommunications System (UMTS) networks, allowing application developers to access the feature-rich core network capabilities. This open access enables network operators to offer innovative services to their subscribers allowing the ability to differentiate themselves in a competitive market. With the imminent commercial deployment of the General Packet Radio Service (GPRS), existing fixed-line Internet service providers (ISPs) can now offer mobile Internet to end users in a UMTS environment where the responsibility of the network operator is reduced to providing IP connectivity. The increased competition from ISPs poses a big threat to the revenue stream of the network operator. This paper explores the possibilities of OSA to facilitate network operators in providing the mutual support of network capabilities and Internet content. These possibilities would allow the network operator to become a value-added mobile Internet service provider (VAM-ISP). © 2002 Lucent Technologies Inc. [source]