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 TitleDate AddedCompany
whitepaper Quality of Service Routing in IP Networks2008-01-01 State University of New York
  Multimedia applications such as video-conferencing, telemedicine, HDTV etc. have very stringent Quality of Service (QoS) demands and require a connection oriented service. For these applications, a path satisfying their requirements in terms of bandwidth, delay, buffer etc. needs to be found. As conventional IP routing is based only on hop counts, it is not suitable for multimedia applications. It is clear that, to route requests that have QoS requirements, existing routers should be made QoS aware and the packet forwarding should be based on QoS parameters. Also, routing protocols like OSPF and RIP must be extended suitably to facilitate QoS routing. The goal of QoS routing algorithms is to find a loop-less path satisfying a given set of constraints on parameters like bandwidth, delay, etc.

Tags: Network Management, Network Technologies		   
whitepaper A Study on Using Network Flows in Hierarchical QoS Routing2008-01-01 Pennsylvania State University
  QoS routing is the process of routing a connection based on the connection's resource requirements. The overhead involved in QoS routing increases with the network size. State aggregation is an important technique that helps to reduce the overhead. This paper proposes a new state aggregation technique based on "Network-flow". The approach allows a domain to update the aggregate sent by other domains and keep track of resource availability in other domains. The paper studies the efficacy of one's approach with respect to various network and traffic parameters. Preliminary simulation results show that one's approach gives a better bandwidth admission ratio when compared with existing techniques.

Tags: Network Management		   
whitepaper Threshold-Based Burst Assembly Policies for QoS Support in Optical Burst-Switched Networks2008-01-01 University of Texas
  This paper proposes a threshold-based burst assembly scheme in conjunction with a burst segmentation policy to provide QoS in Optical Burst Switched (OBS) networks. Bursts are assembled at the network edge by collecting packets that have the same QoS requirements. Once the number of packets in a burst reaches a threshold value, the burst is sent into the network. The paper investigates various burst assembly strategies which differentiate bursts by utilizing different threshold values or assigning different burst priorities to bursts that contain packets with differing QoS requirements. The primary objective of this work is to find the optimal threshold values for various classes of bursts.

Tags: LAN - WAN, Network Management		   
whitepaper Cognitive Packet Networks: QoS and Performance2008-01-01 University of Central Florida
  Reliability, security, scalability and QoS (Quality-of-Service) have become key issues as one envision the future Internet. This paper presents the "Cognitive Packet Network (CPN)" architecture in which intelligent peer-to-peer routing is carried out with the help of "Smart packets" based on best-effort QoS goals. Since packetized voice has stringent QoS requirements, the paper then discusses the choice of a "Goal" and "Reward" function for this application and present experiments conducted for "Voice over CPN". Its performance is detailed via several measurements, and the resulting QoS is compared with that of the IP routing protocol under identical conditions showing the gain resulting from the use of CPN.

Tags: Network Technologies, Network Management		   
whitepaper Juniper EX-Series Ethernet Switches: QoS-Enabling the Enterprise - Assuring End-to-End Application Performance2008-01-01 Juniper Networks
  The enterprise network is no longer a data-only transport. It has evolved into a multi-services infrastructure carrying business-critical applications, voice and video streams, and traffic from building automation and other control systems. The emergence of unified communications will further spur the trend toward converged networks. IT's challenge is to ensure predictable performance for all applications and traffic types sharing the IP infrastructure. The right set of Quality of Service (QoS) tools is critical to meeting this challenge. QoS tools must be sufficiently granular to accommodate a rich mix of traffic types. Network switches and routers deployed at every level in the network must support a complementary set of QoS mechanisms to ensure consistent, predictable traffic handling end-to-end.

Tags: LAN - WAN, Network Management		   
whitepaper Dynamic Security and QoS Adaptation in Real-Time Embedded Systems2008-01-01 University of Virginia
  A number of Real-Time Embedded Systems (RTESs) are used to manage critical infrastructure such as electric grids or C4I systems. In these systems, it is essential to meet deadlines, for example, to avoid a power outage or loss of a life. The importance of security support is also in-creasing, because more RTESs are being networked. To securely transmit sensitive data, e.g., a battle field status, across the network, RTESs need to protect the data via cryptographic techniques. However, security support may cause deadline misses or unacceptable QoS degradation. As an initial effort to address this problem, the security support in RTESs is formulated as a QoS optimization problem.

Tags: Components, Security Administration		   
whitepaper A Performance Comparison of QoS Approaches for Ad Hoc Networks: 802.11e Versus Distributed Resource Allocation2008-01-01 Technical University of Berlin
  This paper compares two approaches for Quality of Service support in WLAN-based ad hoc networks. The first approach is to use per-packet priorities, according to the IEEE 802.11e standard. The second approach is to allocate radio resources on the path between source and destination, according to the protocol 'Distributed end-to-end Allocation of time slots for REal-time traffic' (DARE). Performance simulations show the following results: In case of low load, IEEE 802.11e has slightly lower end-to-end delay and higher packet loss rate, since it does not use any coordination among nodes for real-time packets. In case of medium load, DARE is superior in terms of jitter, delay, and packet loss. In case of high load, DARE clearly outperforms 802.11e.

Tags: Mobile and Wireless, Mobile and Wireless		   
whitepaper QoS Management in WIDENS Terminodes2008-01-01 University of Antwerp
  The paper has two parts: First, he paper presents an overview of the IST WIreless DEployable Network System (WIDENS) Project. This project aims to define an easily deployable communication system to be used by emergency services and public safety in general. In this context, users require a communication system that should not depend on pre-existent infrastructure, and could support real time applications, so that firefighters, policemen, doctors (and others) can collaborate efficiently. In order to meet these requirements, WIDENS implements a wireless ad-hoc network with Quality of Service (QoS) support. Second, the paper focuses on the QoS approach used in WIDENS. This approach is based on a bandwidth reservation scheme. Additionally, the paper gives some simulation results showing the advantages of the reservation scheme.

Tags: Network Management, Mobile and Wireless		   
whitepaper QoS-Aware Discovery of Wide-Area Distributed Services2008-01-01 University of Illinois
  The global computational grids bring together distributed computation/communication resources. Beyond this, the paper envisions the emergence of global 'Service grids', which provide a 'Market' of application-level distributed services for clients to discover and to request. This paper studies the issue of wide-area service discovery in service grids. The paper starts with an existing basic wide-area service discovery framework. The framework adopts a scalable architecture consisting of a hierarchy of Discovery Servers. The paper then identifies problems with the basic framework, and proposes the enhancement of query responsiveness and QoS awareness. The key techniques introduced include: the addition of QoS feedback capability to clients; and the caching and propagation of discovery results with QoS feedbacks in the discovery server hierarchy.   
whitepaper On Quality of Service Optimization With Discrete QoS Options2008-01-01 Carnegie Mellon University
  Quality of Service (QoS) control is considered an important user demand and therefore receives wide attention, especially in the areas of computer networks and real-time multimedia systems. This paper presents a QoS management scheme that enables people to quantitatively measure QoS, and to analytically plan and allocate resource. In this model, available system resources are apportioned across multiple applications such that the net utility that accrues to the end-users of those applications is maximized. The author primarily works with "Continuous" QoS dimensions, and assumed that the 'Utility' gained by improvements along a QoS dimension were always representable by concave functions.