Member Login

E-mail:    Password:  




 TitleDate AddedCompany
whitepaper QoS, QoE & Total Customer Experience2007-07-27 Consultant Registry
  Business success requires productively and simply leveraging an increasingly rich menu of IP network-based Multimedia, Internet, Communications and Entertainment (MICE) capabilities. Due to the sophistication required to provide, support and manage MICE capabilities they are often purchased as services from a service provider. Because MICE services are critical to business success, organizations of all sizes are evolving to an enlightened, business-focused method of choosing network services and service providers called Total Customer Experience (TCE). This white paper describes the evolution toward a TCE approach and the benefits and clarity that TCE brings to the marketplace.

Tags: SLA		   
whitepaper An Experimental Investigation of the End-to-End QoS of the Apple Darwin Streaming Server2007-07-15 Politecnico di Bari
  Video content distribution over the traditional best-effort, store-and-forward Internet Protocol is of ever increasing importance due to the great success of new web services such as personal video broadcast or television over IP (IPTV). This paper investigates the end-to-end Quality of Service (QoS) that is provided by the Apple Darwin Streaming Server and the Quick-Time client player in the presence of time-varying available bandwidth and multiple concurrent streaming sessions. The considered end-to-end QoS parameters are loss rates and friendliness experienced in the presence of variable available bandwidth and when multiple QuickTime streaming sessions and/or TCP sessions compete in order to obtain a bandwidth share.

Tags: TCP - IP, Streaming Media		   
whitepaper Critical Transfer Issues in QoS-C Architecture Models and Session-Based Communication2007-07-04 University of Rousse
  This paper discusses the major issues and key factors definitions in QoS-C architecture models and session-based communication in MAN environment. Although network parameters as frame delay, frame jitter and packet loss are familiar in computer networks, they are examined in this work as an integrated part of the critical transfer framework thus demonstrating a new summarized view on the design of converged communication platform. A framework of QoS-C environment is outlined, including the most important goals in the contemporary session-based communication.   
whitepaper A Statistical Approach to Risk Mitigation in Computational Markets2007-06-29 Association for Computing Machinery
  This paper studies stochastic models to mitigate the risk of poor Quality-of-Service (QoS) in computational markets. Consumers who purchase services expect both price and performance guarantees. They need to predict future demand to budget for sustained performance despite price fluctuations. Conversely, providers need to estimate demand to price future usage. The skewed and bursty nature of demand in large-scale computer networks challenges the common statistical assumptions of symmetry, independence, and stationarity. This discrepancy leads to underestimation of investment risk. The paper confirms this non-normal distribution behavior in the study of demand in computational markets. The high agility of a dynamic resource market requires flexible, efficient, and adaptable predictions.

Tags: Cost Control - Risk Mgmt.		   
whitepaper Optimal Replica Placement in Tree Networks With QoS and Bandwidth Constraints and the Closest Allocation Policy2007-06-28 French National Institute for Research in Computer Science and Control
  This paper deals with the replica placement problem on fully homogeneous tree networks known as the Replica Placement optimization problem. The client requests are known beforehand, while the number and location of the servers are to be determined. The latter problem is investigated using the Closest access policy when adding QoS and bandwidth constraints. The paper proposes an optimal algorithm in two passes using dynamic programming.

Tags: Bandwidth Issues		   
whitepaper QUORUM - QUality Of Service RoUting in Wireless Mesh Networks2007-06-13 Association for Computing Machinery
  Wireless Mesh Networks (WMNs) can provide seamless broadband connectivity to network users, with the advantage of low setup and maintenance costs. To support next-generation applications with real-time requirements, however, these networks must provide improved Quality of Service guarantees. Most current mesh network routing protocols are adapted from MANET protocols, and do not optimize for mesh network properties. This paper proposes QUORUM (QUality Of service RoUting in wireless Mesh networks), a routing protocol optimized for WMNs that addresses these drawbacks. QUORUM integrates a novel end-to-end packet delay estimation mechanism with stability-aware routing policies, allowing it to more accurately follow QoS requirements while minimizing misbehavior of selfish nodes.

Tags: TCP - IP, Mobile - Wireless Communications		   
whitepaper An Approach to Enhance the QoS Support to Real-Time Traffic on IEEE 802.11e Networks2007-06-12 Universita di Catania
  This paper proposes an approach to overcome some limitations of the 802.11e protocol highlighted in recent literature and improve the QoS support provided to real-time industrial traffic. The proposed solution does not change the IEEE 802.11e protocol, but introduces a technique to reduce the number of collisions and therefore to use the channel more efficiently for real-time traffic, especially when the traffic load is high and approaches saturation conditions. The proposed mechanism, called a Contention Window Adapter, dynamically changes the contention window size of the different Access Categories defined by the IEEE 802.11e protocol according to the wokload conditions of the wireless network. The paper describes the rationale behind the CWA mechanism, the algorithm itself and discusses the performance obtained through simulations run using ns-2.

Tags: Mobile - Wireless Communications, Wi-Fi (802.11)		   
whitepaper Expanding Data Center Capacity with Water-cooled Cabinets2007-06-01 Intel
  Intel IT uses water-cooled cabinets to complement our primary strategy of achieving high density at lower cost using air-cooled data center designs.

Tags: Database Management, Network Design, Data Center, Database Applications, Infrastructure Management		   
whitepaper Impact of Precedence Enabled Per Hop Behaviors on TCP Flows2007-05-16 Johns Hopkins University
  In the Department of Defense's (DoD) Global Information Grid (GIG) transport network, packet handling must provide preferential transport to high Precedence traffic under all networking conditions, specifically conditions of resource scarcity, e.g., network overload conditions, while simultaneously satisfying packet scheduling required to meet application Quality of Service (QoS) needs. The approach to this duality is to enhance Active Queue Management (AQM) techniques to provide Precedence and Preemption (P&P) capabilities and rely upon standard, well studied QoS Per Hop Behavior (PHB), e.g., Weighted Round Robin, Class-Based Fair Queuing, etc., for handling QoS requirements. In this way, when operating under engineered loads, the well known scheduling algorithms support high quality QoS for applications.

Tags: TCP - IP		   
whitepaper Analytical Evaluation and Automated Design of Networks-on-Chip2007-05-15 Stanford University
  As Systems-on-Chip (SoC) become more prevalent, and as computer architecture as a whole makes a shift to more modular and parallel designs, on-chip interconnection networks are seen more and more frequently,. As with all aspects of microprocessor design, as the problem size and design space grows, arriving at an efficient solution by hand quickly becomes intractable. It becomes necessary to automate the design process. This principle applies to interconnection networks as well. The interconnection network field is fairly developed; however, only in recent years has semiconductor technology provided enough transistors on a single chip to make on-chip networks a possibility.

Tags: Network Design