Differentiated service

About: Differentiated service is a research topic. Over the lifetime, 5539 publications have been published within this topic receiving 105225 citations.

Service engineering to intensify service contents in product life cycles

Abstract: This paper discusses how to establish service engineering that is intended to intensify service contents of product life cycles. Intensification of service and knowledge contents within product life cycles is considered crucial for dematerialization, in particular, to design optimal product-service systems from the viewpoint of environmentally conscious design and manufacturing in advanced post industrial societies. The paper tries to define service as an activity that changes the state of a service receiver. Service contents of the service is provided by a service provider and delivered through a service channel. Artifacts are either the service contents or the service channel. Service engineering looks at development, design, and production of services and aims at improving the efficiency and quality of the service as well as its delivery. To establish service engineering, the paper then proposes a modeling technique of service.

On-demand QoS routing in multihop mobile networks

Abstract: The emergence of nomadic applications have generated a lot of interest in next generation wireless network infrastructures which provide differentiated service classes. So it is important to study how the quality of service (QoS) should be guaranteed. To accomplish this, we develop an admission control scheme which can guarantee bandwidth for real-time applications in multihop mobile networks. In our scheme, a host need not discover and maintain any information of the network resources status on the routes to another host until a connection request is generated for the communication between the two hosts, unless the former host is offering its services as an intermediate forwarding station to maintain connectivity between two other hosts. This bandwidth guarantee feature is important for a mobile network to interconnect wired networks with QoS support. Our connection admission control scheme can also work in a standalone mobile ad hoc network for real-time applications. This control scheme contains end-to-end bandwidth calculation and bandwidth allocation. Under such a scheme, the source is informed of the bandwidth and QoS available to any destination in the mobile network. This knowledge enables the establishment of QoS connections within the mobile network and the efficient support of real time applications. In the case of an ATM interconnection, the bandwidth information can be used to carry out intelligent handoff between ATM gateways and/or to extend the ATM virtual circuit service to the mobile network with possible renegotiation of QoS parameters at the gateway. We examine via simulation the system performance in various QoS traffic flows and mobility environments. The "on-demand" feature enhances the performance in the mobile environment because the source can keep more connectivity with enough bandwidth to a receiver in the path-finding duration.

Differentiated Services Quality of Service Policy Information Base

Abstract: This document describes a Policy Information Base (PIB) for a device implementing the Differentiated Services Architecture. The provisioning classes defined here provide policy control over resources implementing the Differentiated Services Architecture. These provisioning classes can be used with other none Differentiated Services provisioning classes (defined in other PIBs) to provide for a comprehensive policy controlled mapping of service requirement to device resource capability and usage.

Method of providing telecommunications services

Abstract: Traditional IN (Intelligent Network) services in a PSTN use service logic and data that is accessible for use only by the PSTN, though provision may be made for users to change certain controlled parameters of the services. The present system has the service logic and data ('service resource items') placed on servers (51) accessible over the Internet (50). This permits service resource items to be accessed from the service control subsystem (42) of a PSTN on a worldwide basis using the highly-resilient infrastructure of the Internet (50). Furthermore, the updating of the service resource items can be made the responsibility of the party to whom the service resource item relates, such updating being readily effected by access direct to the server (51) holding the resource items.

Convergence of ethernet PON and IEEE 802.16 broadband access networks and its QoS-aware dynamic bandwidth allocation scheme

Abstract: IEEE 802.16 and Ethernet Passive Optical Network (EPON) are two promising broadband access technologies for high-capacity wireless access networks and wired access networks, respectively. They each can be deployed to facilitate connection between the end users and the Internet but each of them suffers from some drawbacks if operating separately. To combine the bandwidth advantage of optical networks with the mobility feature of wireless communications, we propose a convergence of EPON and 802.16 networks in this paper. First, this paper starts with presenting the converged network architecture and especially the concept of virtual ONU-BS (VOB). Then, it identifies some unique research issues in this converged network. Second, the paper investigates a dynamic bandwidth allocation (DBA) scheme and its closely associated research issues. This DBA scheme takes into consideration the specific features of the converged network to enable a smooth data transmission across optical and wireless networks, and an end-to-end differentiated service to user traffics of diverse QoS (Quality of Service) requirements. This QoS-aware DBA scheme supports bandwidth fairness at the VOB level and class-of-service fairness at the 802.16 subscriber station level. The simulation results show that the proposed DBA scheme operates effectively and efficiently in terms of network throughput, average/maximum delay, resource utilization, service differentiation, etc.