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 TitleDate AddedCompany
whitepaper The Service Exchange Framework2007-05-12 Cisco Systems
  Next-Generation Networks (NGN) is rife with potential: personalized services, interoperating applications, keeping a connection from home to office and from PDA to PC to phone. But to a large extent, this potential has yet to be realized with intelligent networks that provide the subscriber and application awareness required to effectively converge the plethora of residential and business services available today. Consumers have access to a wide array of communications, entertainment, and online services, usually from a wide variety of broadband service providers. A provider monitoring and limiting bandwidth could determine, for example, that demand is less during certain hours of the day and offer a managed service package for small businesses with guaranteed bandwidth and Quality of Service (QoS).

Tags: Broadband		   
whitepaper QoS-Enabled Internet-on-Train Network Architecture: Inter-Working by MMP-SCTP Versus MIP2007-05-10 Ghent University
  Internet-on-the-train is a rising concept in the last few years. Several trials in different countries have proved the feasibility of offering Internet access to train commuters, but none of them combines broadband access, scalability, seamless handover and quality of service guarantees in one solution. This paper proposes a new architecture to satisfy these needs. Using real handover measurement data of several common broadband wireless technologies, the paper compares two possible inter-working mobility solutions: Mobile Multi-Path SCTP (MMP-SCTP) and Mobile IP (MIP).

Tags: Network Design, Mobile - Wireless Communications		   
whitepaper Probabilistic QoS and Soft Contracts for Transaction Based Web Services Orchestrations2007-05-08 French National Institute for Research in Computer Science and Control
  Web services orchestrations and choreographies require establishing Quality of Service (QoS) contracts with the user. This is achieved by performing QoS composition, based on contracts established between the orchestration and the called Web services. These contracts are typically stated in the form of hard guarantees (e.g., response time always less than 5 msec). This paper proposes using soft contracts instead. Soft contracts are characterized by means of probability distributions for QoS parameters. The paper shows how to compose such contracts, to yield a global contract (probabilistic) for the orchestration. The approach is implemented by the TOrQuE tool. Experiments on TOrQuE show that overly pessimistic contracts can be avoided and significant room for safe overbooking exists.

Tags: Web Services		   
whitepaper Using SLA Context to Ensure Quality of Service for Composite Services2007-04-30 University of Saskatchewan
  As service-orientation is establishing itself as the dominant design and integration paradigm for large heterogeneous and open systems, the lines between wired and wireless consumers and providers begin to blur. Due to the availability of toolkits and standards it is now fairly easy to build nomadic service consumers that provide users transparent access to enterprise services. However, since nomadic consumers are typically characterized by limited computational resources, they are very dependent on reliable service providers. Unlike their more resource rich wired counterparts, that can in case of a provider slowdown or failure simply rebind to an alternative provider, the nomadic consumers lack the bandwidth to execute to do so in sufficient time.

Tags: SLA		   
whitepaper QoS in Wireless Mesh Networks: Challenges, Pitfalls, and Roadmap to Its Realization2007-04-27 Association for Computing Machinery
  Wireless Mesh Networks (WMNs) have the potential to lead to a disruptive change in the landscape of wireless communications. The vision to support self-engineered wireless network infrastructures that allow for an organic growth of the network is to be realized by means of self-organizing mechanisms for network configuration, control and optimization. Supporting a Quality of Service (QoS) to enable a rich portfolio of applications and scenarios is foreseen to be vital for the success of next generation WMNs. Today's cutting edge standards supporting WMNs (e.g. IEEE 802.16's mesh mode and IEEE 802.11s) are not perfectly equipped to cater to this task.

Tags: Mobile - Wireless Communications, Wi-Fi (802.11)		   
whitepaper PAETEC Case Study: Morrison Mahoney LLP2007-04-05 PAETEC
  The inability to identify points of failure, coupled with a lack of reporting capabilities, also made it difficult for the Director of Information Technology to confidently continue with a point-to-point infrastructure. In order to ensure voice redundancy, Director of Information Technology turned to a telecommunications consultant. PAETEC provided the Director of Information Technology with MPLS VPN with Quality of Service (QoS), connecting each of its locations and providing data redundancy. PAETEC's MPLS VPN with QoS allows the Director of Information Technology to transfer data applications over PAETEC's secure, private IP network.

Tags: VPNs, MPLS		   
whitepaper Mapping of Formal Network Quality-of-Service Requirements2007-04-05 University of Kaiserslautern
  The provision of network Quality-of-Service (network QoS) in wireless (ad-hoc) networks is a major challenge in the development of future communication systems. Before designing and implementing these systems, the network QoS requirements are to be specified. Since QoS functionalities are integrated across layers and hence QoS specifications exist on different system layers, a QoS mapping technique is needed to translate the specifications into each other. This paper formalizes the relationship between layers. Based on a comprehensive and holistic formalization of network QoS requirements, the paper defines two kinds of QoS mappings. QoS domain mappings associate QoS domains of two abstraction levels. QoS scalability mappings associate utility and cost functions of two abstraction levels.

Tags: Scalability, Mobile - Wireless Communications		   
whitepaper Optimal Routing of Dynamically Priced Network Services2007-03-31 University of Victoria
  The use of dynamically priced network services was previously proposed to provide QoS guarantees within a network. End-to-end QoS can be achieved by concatenating several of these services from different ISPs. This paper considers the problem of a single ISP determining the optimal paths on which to route each service within its network, as well as the optimal bandwidth to allocate to each service, in order for the ISP to maximize its revenue. It is assumed that the ISP can estimate the demand functions for each service. Three heuristics are defined: Service Grouping, Iterative Bottleneck Avoidance, and Iterative Bottleneck Avoidance with Tabu. The paper demonstrates that Iterative Bottleneck Avoidance with Tabu achieves approximately 98% of an optimal solution.

Tags: Bandwidth Issues, ISPs		   
whitepaper An End-to-End QoS Framework for 4G Mobile Heterogeneous Environments2007-03-17 University of Aveiro
  Next Generation Networks (NGN) will be based upon the "all IP" paradigm. The IP protocol will glue multiple technologies, for both access and core network, in a common and scalable framework that will provide seamless communication mobility not only across those technologies, but also across different network operators. This paper describes a framework for QoS support in such NGNs, where multi-interface terminals are given end-to-end QoS guarantees regardless of their point of attachment. The framework supports media independent handovers, triggered either by the user or by the network, to optimize network resources' distribution. The framework integrates layer two and layer three handovers by exploiting minimal additions to existing IETF and IEEE standards.

Tags: TCP - IP, Mobile - Wireless Communications		   
whitepaper Enhancement of Video Streaming QoS With Active Buffer Management in Wireless Environments2007-02-27 University of Stuttgart
  With the emergence of high-speed wireless cellular networks, such as High Speed Downlink Packet Access (HSDPA) or WiMAX, new services with a high bandwidth demand have been introduced. One example is non-interactive video streaming. In contrast to wireline networks, the characteristics of wireless links, such as a time-varying bandwidth and the trade-off between delay and reliability, impose problems to a streamed video. This paper studies the impact of delay and losses within a Radio Access Network (RAN) on the video quality at the example of a state-of-the art HSDPA network. The nature of transmission errors is discussed.

Tags: Streaming Media, Mobile - Wireless Communications