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Accurate and explicit differentiation of wireless and congestion losses 23

Accurate and explicit differentiation of wireless and conges...

引用

23rd international conference on distributed computing systems workshops

作者： Arya, V Turletti, T Planete Project INRIA Sophia Antipolis France

ISBN: (纸本)0769519210

In recent years mobile computing has experienced an explosive growth, mainly due to the integration of wireless networks with the wired Internet. To deploy bandwidth-greedy multimedia applications on such heterogeneous environments, efficient congestion control algorithms are required. When congestion control protocols such as TFRC are used to transmit multimedia flows, they need to differentiate between congestion losses and wireless losses to behave correctly and efficiently. Currently proposed end-to-end loss differentiation mechanisms can not reliably predict the differences between congestion and wireless losses. In this paper we explore explicit loss differentiation. We have designed a simple window framework to explicitly and accurately differentiate these losses. By deploying agents at the boundaries of-wireless links, we show that we can efficiently implement our window-based scheme with low overhead. We also point out current limitations of our scheme.

关键词： Computer networks Explosives Feedback IP networks Mobile computing Propagation losses Streaming media Videoconference Wireless application protocol Wireless LAN

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Paradropper: A general-purpose global computing environment built on peer-to-peer overlay network 23

Paradropper: A general-purpose global computing environment ...

引用

23rd international conference on distributed computing systems workshops, ICDCSW 2003

作者： Zhong, Liu Wen, Don Ming, Zhang Wei Peng, Zou Department of Management Science Department of Computer Science Changsha Institute of Technology China

ISBN: (纸本)0769519210

We describe Paradropper, a general-purpose global computing system based on a peer-to-peer self-organizing overlay network. In Paradropper, the peer is organized into an overlay network with "small world" characteristics, and workload is well balanced among the peers according to their workload in a decentralized manner. Particularly, it not only supports embarrassing parallel computing mode, but also allows correlativity between tasks. Moreover, the master/worker roles are extended in Paradropper, which makes it more flexible in computing environment configuration. © 2002 IEEE.

关键词： distributed computer systems

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A communication architecture and programming abstractions for real-time embedded sensor networks 23

A communication architecture and programming abstractions fo...

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23rd international conference on distributed computing systems workshops

作者： Abdelzaher, T Stankovic, J Son, S Blum, B He, T Wood, A Lu, CY Univ Virginia Dept Comp Sci Charlottesville VA 22904 USA

ISBN: (纸本)0769519210

Data distribution in embedded real-time sensor networks requires new protocols and programming environments that achieve time-sensitive message delivery and provide useful abstractions to the application programmer Attainment of these goals requires changes to multiple layers of the communication protocol stack. In this paper we review a protocol suite developed by the authors for data communication in embedded sensor networks. It takes into account time constraints and exports attribute-based connections that are tightly integrated with properties of the monitored environment. A programming language is described that allows external physical objects to be represented as first class abstractions in the computing system. The language facilitates writing monitoring applications. The system was implemented on a prototypical sensor network based on MICA motes.

关键词： sensor networks programming paradigms tracking QoS distributed systems

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Scaling server selection using a multi-broker architecture 23

Scaling server selection using a multi-broker architecture

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23rd international conference on distributed computing systems workshops

作者： Mohamed-Salem, MVO von Bochmann, G Wong, JW Univ Montreal Montreal PQ H3C 3J7 Canada

ISBN: (纸本)0769519210

Server replication is a common approach to improving. the scalability of a service on the Internet. For this approach, the task of finding an appropriate server from a set of replicas is a critical issue. We. have proposed in a previous work an architecture where a broker is used to provide server selection on a per session basis. When the-number of servers and/or the number of clients becomes large, a single broker may not have sufficient capacity to handle the load. An extended architecture based on the replication of brokers is therefore considered. We first discuss alternative organizations that support access to multiple brokers and the needed cooperation between brokers in order to achieve server selection effectively. We then propose a server selection policy for our multiple broker architecture and evaluate its performance by simulation.

关键词： Algorithm design and analysis Clustering algorithms Computational modeling distributed computing Domain Name System Network servers Scalability Service riented architecture Web and internet services Web server

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Proxy location problems and their generalizations 23

Proxy location problems and their generalizations

引用

23rd international conference on distributed computing systems workshops

作者： Choi, SM Shavitt, Y Washington Univ Dept Comp Sci St Louis MO 63130 USA

ISBN: (纸本)0769519210

In this paper we suggest a new angle to look on proxy location problems. We view the proxy as a service and generalize the problem of optimally placing proxies to optimally placing any service in the network. We differentiate between two cases: transparent services, such as transparent caches (TERCs), and non-transparent services where the end stations, such as hosts using a cache, need to be configured with respect to the service locations. This formulation enables us to study in a unified framework the location problems related to active networks, overlay peer-to-peer networks, as well as, CDNs and caching. For both cases we formalize the problem of optimally placing network servers and introduce approximation algorithms. We present simulation results of approximations and heuristics. We also present an optimal solution for the location problem for a special topology. We show, through a series of examples, that our approach can be applied to a variety of different services.

关键词： Approximation algorithms Authentication Computer science Costs Network servers Network topology Peer to peer computing Telecommunication traffic Traffic control Web server

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SACCS: Scalable asynchronous cache consistency scheme for mobile environments 23

SACCS: Scalable asynchronous cache consistency scheme for mo...

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23rd international conference on distributed computing systems workshops

作者： Wang, ZJ Das, S Che, H Kumar, M Univ Texas Ctr Res Wireless Mobil & Networking Dept Comp Sci & Engn Arlington TX 76019 USA

ISBN: (纸本)0769519210

In this paper, we propose a novel cache consistency maintenance scheme, called Scalable Asynchronous Cache Consistency Scheme (SACCS), for mobile environments. It relies on the following three key features: (1) Use of flag bits at server and MU's cache to maintain cache consistency;(2) Use of an identifier (ID) for each entry in MU's cache after its invalidation in order to maximize the broadcast bandwidth efficiency;(3) Rendering all valid entries of MU's cache to uncertain state when it wakes up. These three features make the SACCS a highly scalable algorithm with minimum database management overhead. Comprehensive simulation results show that the performance of SACCS is superior to those of existing algorithms.

关键词： Bandwidth Broadcasting Computational modeling Computer science Data communication Delay Mobile computing Spatial databases Telecommunication traffic Wireless communication

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MESHMd1 -: A middleware for self-organization in ad hoc networks 23

MESH<i>Md1</i> -: A middleware for self-organization in ad h...

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23rd international conference on distributed computing systems workshops

作者： Herrmann, K Berlin Univ Technol Inst Telecommun Syst iVS D-10587 Berlin Germany

ISBN: (纸本)0769519210

The maturing domain of ad hoc networking still holds some major challenges on its way to commercial exploitation. The dynamic and decentralized nature of ad hoc networks calls for new paradigms in the design of distributed applications. Most notably, there is a need for self-organization mechanisms in the middleware layer to enable medium-scale and large-scale distributed applications. In this paper we present MESHMd1, a middleware platform for ad hoc networks that is built on mobile agents and tuple space technology. MESHMd1 provides basic building blocks for the implementation of self-organizing distributed applications for ad hoc networks. Unlike other middleware platforms, MESHMd1 puts a high emphasis on mobility awareness, decoupling and bio-inspired coordination primitives. We discuss the aspects of ad hoc networking and self-organization and derive the basic architecture of MESHMd1 before we present our prototype implementation.

关键词： Ad hoc networks Centralized control Computer network reliability Intelligent networks Large-scale systems Middleware Mobile agents Mobile communication Mobile computing Network servers

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Simulated performance evaluation of a hybrid MAC-layer protocol for dependable multi-channel distributed systems with hard real-time requirements 23

Simulated performance evaluation of a hybrid MAC-layer proto...

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23rd international conference on distributed computing systems workshops

作者： Koubias, SA Univ Patras Dept Elect & Comp Engn Patras 26500 Greece

ISBN: (纸本)0769519210

In this paper an efficient hybrid MAC-layer protocol for dependable multi-channel networking structures is presented and evaluated. This new protocol handles C sub-channels totally, that is c physically or frequency divided sub-channels for the information or data packets and one (1) request sub-channel, where the request packets are transmitted and (C=c+1). The proposed mechanism for the accessing of the request sub-channel slots is a TDMA-like scheme. An effective reservation mechanism based on the transmitted requests is used for the deterministic accessing of the slots of the information sub-channels, mainly at high loads. Additionally, the random access ALOHA-like protocol is selected for the dynamic accessing of the Free Information Slots (FISs) for low traffic conditions, when the stations transmit no requests. This combination offers bounded packet delay and high throughput - mean delay performance under mixed (asynchronous/synchronous) traffic. On the other hand, the proposed multi-channel networking structure offers high operational reliability due to the existed channel redundancy.

关键词： Access protocols Availability Communication system traffic control Computational modeling Computer networks Delay distributed computing Frequency conversion Media Access Protocol Real time systems

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Gateway: A message hub with store-and-forward messaging in mobile networks 23

Gateway: A message hub with store-and-forward messaging in m...

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23rd international conference on distributed computing systems workshops

作者： Yoneki, E Bacon, J Univ Cambridge Comp Lab Cambridge CB3 0FD England

ISBN: (纸本)0769519210

To obtain good performance in messaging over mobile networks, we have developed a Gateway. Gateway is a message hub that transmits information using store-and-forward messaging and provides powerful optimization and data transformation. The SmartCaching component provides generic caching in an N-tier architecture, an essential function of Gateway. Gateway can be integrated into Pronto, a middleware system for mobile applications with messaging as a basis [15]. Pronto then offers: 1) a lightweight client of Message Oriented Middleware (MOM) based on Java Message Service(JMS), 2) Gateway for reliable and efficient transmission between mobile devices and a server and 3) Serverless JMS based on IP multicast. Integration of Gateway within Pronto provides a solution for mobile application-specific problems such as resource constraints, network characteristics, and data optimization.

关键词： Bandwidth Computer networks Intelligent networks Java Libraries Message-oriented middleware Mobile communication Mobile computing Network servers Wireless networks

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Dynamic fair bandwidth allocation in multiservice CDMA networks 23

Dynamic fair bandwidth allocation in multiservice CDMA netwo...

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23rd international conference on distributed computing systems workshops

作者： Li, CZ Papavassiliou, S New Jersey Inst Technol Dept Elect & Comp Engn New Jersey Ctr Wireless Networking & Internet Sec Broadband Mobile & Wireless Networking Lab Newark NJ 07102 USA

ISBN: (纸本)0769519210

In this paper we study the fundamental problem of allocating with efficiency and fairness the available resources in a CDMA wireless system that supports multi-rate multimedia services. We propose the Channel Adaptive Rate Scheduling (CARS) algorithm which adopts the use of dynamically assigned data rates that match the channel capacity in order to improve the system throughput and overcome the problems associated with the channel chnaging conditions, the variable system capacity and the transmission power limitation. In addition to the throughput improvement CARS also achieves the objective of fairness by adjusting the users' weights dynamically. The performance analysis and evaluation of our proposed algorithm is achieved via modeling and simulation in terms of achievable throughput and fairness.

关键词： Adaptive scheduling Channel allocation Channel capacity Dynamic scheduling Multiaccess communication Multimedia systems Performance analysis Resource management Scheduling algorithm Throughput

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