13,845 research outputs found

    QoS management and control for an all-IP WiMAX network architecture: Design, implementation and evaluation

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    The IEEE 802.16 standard provides a specification for a fixed and mobile broadband wireless access system, offering high data rate transmission of multimedia services with different Quality-of-Service (QoS) requirements through the air interface. The WiMAX Forum, going beyond the air interface, defined an end-to-end WiMAX network architecture, based on an all-IP platform in order to complete the standards required for a commercial rollout of WiMAX as broadband wireless access solution. As the WiMAX network architecture is only a functional specification, this paper focuses on an innovative solution for an end-to-end WiMAX network architecture offering in compliance with the WiMAX Forum specification. To our best knowledge, this is the first WiMAX architecture built by a research consortium globally and was performed within the framework of the European IST project WEIRD (WiMAX Extension to Isolated Research Data networks). One of the principal features of our architecture is support for end-to-end QoS achieved by the integration of resource control in the WiMAX wireless link and the resource management in the wired domains in the network core. In this paper we present the architectural design of these QoS features in the overall WiMAX all-IP framework and their functional as well as performance evaluation. The presented results can safely be considered as unique and timely for any WiMAX system integrator

    Route selection for QoS over Mobile IP

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    Influenced by the availability of powerful portable computers, and the expansion of Internet-based services, consumers demand mobile Internet. This implies supporting user mobility while sustaining network connectivity which in turn requires more sophisticated routing methods than simple static Internet protocol. Routing optimization is critical for the efficiency of mobile Internet as it directly impacts resource utilization in the network. On the other hand, while connected to the Internet, users want to enjoy real-time services. Granting quality of service for real-time multimedia applications is one of the major concerns for Internet Service Providers. In the mobile Internet context, as a result of a signalling conflict, providing quality of service declines in presence of routing optimisation. This conflict must be resolved to achieve efficient resource utilization in the networks and provide quality of service for real-time Internet-based services. This thesis presents a solution for resolving the aforementioned conflict. Initially a set of requirements are established for a new solution. The fundamental idea is developed based on exercising routing optimization according to quality of service requirements and network conditions. A new protocol architecture for Mobile IP (MIP) is built based on a cross-layer design technique. This design implies that a new data flow collects the necessary parameters in the network. This data is passed to a new entity in the network layer of the MIP protocol stack that inter-connects IP, routing, mobility and resource reservation protocols. Based on network conditions and the quality of service requirements the optimal path is selected over which the resources are reserved for the duration of the connection. The new solution named MIP with Routing Optimization and QoS (MIP-ROQS) removes the signalling conflict and furthermore, results in increased network performance. Simulation of this solution demonstrates reduction in application end-to-end delay and delay variation, improved core network by reducing the amount of control traffic and dropped traffic and improved access network by reducing its delay. Moreover, we integrate Multi Protocol Label Switching (MPLS) architecture and MIP-ROQS to take advantage of MPLS labelling mechanism to label the optimal path selected by MIP-ROQS for the duration of a session. This integration makes IP-in-IP tunnelling in data forwarding redundant. MPLS is used to switch packets and label the optimal path over which the resources are reserved. Using this approach, the transmission delay, and packet processing overhead are further reduced

    Quality of Service over Specific Link Layers: state of the art report

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    The Integrated Services concept is proposed as an enhancement to the current Internet architecture, to provide a better Quality of Service (QoS) than that provided by the traditional Best-Effort service. The features of the Integrated Services are explained in this report. To support Integrated Services, certain requirements are posed on the underlying link layer. These requirements are studied by the Integrated Services over Specific Link Layers (ISSLL) IETF working group. The status of this ongoing research is reported in this document. To be more specific, the solutions to provide Integrated Services over ATM, IEEE 802 LAN technologies and low-bitrate links are evaluated in detail. The ISSLL working group has not yet studied the requirements, that are posed on the underlying link layer, when this link layer is wireless. Therefore, this state of the art report is extended with an identification of the requirements that are posed on the underlying wireless link, to provide differentiated Quality of Service

    Wireless internet architecture and testbed for wineglass

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    One of the most challenging issues in the area of mobile communication is the deployment of IPbased wireless multimedia networks in public and business environments. The public branch may involve public mobile networks, like UMTS as 3G system, while the business branch introduces local radio access networks by means of W-LANs. Conventional mobile networks realise mobile specific functionality, e.g. mobility management or authentication and accounting, by implementing appropriate mechanisms in specific switching nodes (e.g. SGSN in GPRS). In order to exploit the full potential of IP networking solutions a replacement of these mechanisms by IP-based solutions might be appropriate. In addition current and innovative future services in mobile environments require at least soft-guaranteed, differentiated QoS. Therefore the WINE GLASS project investigates and implements enhanced IP-based techniques supporting mobility and QoS in a wireless Internet architecture. As a means to verify the applicability of the implemented solutions, location-aware services deploying both IP-mobility and QoS mechanisms will be implemented and demonstratedPeer ReviewedPostprint (published version

    Solutions for IPv6-based mobility in the EU project MobyDick

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    Proceedings of the WTC 2002, 18th World Telecommunications Congress, Paris, France, 22 -27 September, 2002.Mobile Internet technology is moving towards a packet-based or, more precisely, IPv6-based network. Current solutions on Mobile IPv6 and other related QoS and AAA matters do not offer the security and quality users have come to take for granted. The EU IST project Moby Dick has taken on the challenge of providing a solution that integrates QoS, mobility and AAA in a heterogeneous access environment. This paper focuses on the mobility part of the project, describes and justifies the handover approach taken, shows how QoS-aware and secure handover is achieved, and introduces the project's paging concept. It shows that a transition to a fully integrated IP-RAN and IP-Backbone has become a distinct option for the future.Publicad

    TV-Centric technologies to provide remote areas with two-way satellite broadband access

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    October 1-2, 2007, Rome, Italy TV-Centric Technologies To Provide Remote Areas With Two-Way Satellite Broadband Acces
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