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Conference on Local Computer Networks (LCN)

作者： A. Boukerche Sungbum Hong T. Jacob Parallel Simulation and Distributed Systems (PARADISE) Research Laboratory Department of Computer Science University of North Texas USA

ISBN: (纸本)0769513212

The rapid development in portable computing platforms, distributed multimedia systems and wireless communication technologies has led to a significant interest in mobile multimedia and wireless networking. Video entertainment and multimedia Internet access over wireless networks are examples of future wireless personal communication systems. These, however, incur challenging technological issues. The synchronization of the multimedia objects among mobile clients is one of the most important of these issues. The task of synchronization in wireless multimedia systems is to eliminate variations and delays incurred during the transmission of multiple-media streams and to maintain the temporal order among the various media streams. We propose an efficient distributed multimedia synchronization algorithm for wireless and mobile multimedia systems to ensure and facilitate mobile clients' access to multimedia objects. We discuss the algorithm and provide its formal proof and correctness.

关键词： Streaming media Multimedia systems Wireless communication Computer networks distributed computing Portable computers Communications technology Mobile computing Multimedia computing IP networks

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A risk-free multiversion temporally correct algorithm

A risk-free multiversion temporally correct algorithm

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International Symposium on parallel and distributed Processing (IPDPS)

作者： A. Boukerche T. Tuck Department of Computer Sciences Parallel Simulation and Distributed Systems (PARADISE) Research Laboratory University of North Texas USA

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Performance comparison of data distribution management strategies 01

Performance comparison of data distribution management strat...

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International Workshop/Symposium on distributed simulation and Real-Time Applications (DS-RT)

作者： A. Boukerche C. Dzermajko Parallel Simulation and Distributed Systems PARADISE Research Laboratory Department of Computer Science University of North Texas USA

Abstract: Data Distribution Management (DDM) is a High Level Architecture/Run-time Infrastructure (HLA/RTI) service that manages the distribution of state updates and interaction information in large scale distributed simulations, limits and controls the volume of data exchanged during the simulation. In this paper we focus upon the following three DDM schemes: Region-Based, Fixed and Dynamic Grid-Based techniques. In an effort to determine the most efficient model for applying the DDM service, we developed a mini-RTI Kit framework and propose a set of benchmarks to compare these DDM schemes. Using the RTI Kit, we performed extensive simulation experiments and present our analysis of the results of numerous federation executions.

关键词： distributed decision making Computational modeling Computer simulation Discrete event simulation Subscriptions Filtering Computer science Large-scale systems Analytical models Performance analysis

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A simulation based study of on-demand routing protocols for ad hoc wireless networks

A simulation based study of on-demand routing protocols for ...

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Annual Symposium on simulation

作者： A. Boukerche Parallel Simulation and Distributed Systems PARADISE Research Laboratory Department of Computer Science University of North Texas USA

ISBN: (纸本)0769510922

Ad hoc networks are wireless, mobile networks that can be set up anywhere and anytime without the aid of any established infrastructure or centralized administration. Because of the limited range of each host's wireless transmission, to communicate with hosts outside its transmission range, a host needs to enlist the aid of its nearby hosts in forwarding packets to the destination. However, since there is no stationary infrastructure such as base stations, each host has to act as a router for itself. A routing protocol for ad hoc networks is executed on every host and is therefore subject to the limit of the resources at each mobile host. A good routing protocol should minimize the computing load on the host as well as the traffic overhead on the network. Therefore, a number of routing protocols have been proposed for ad hoc wireless networks. We focus upon on-demand schemes. We study and compare the performance of the following three routing protocols AODV, CBRP and DSR. A variety of workload and scenarios, as characterized by mobility, load and size of the ad hoc network were simulated. Our results indicate that despite its improvement in reducing route request packets, CBRP has a higher overhead than DSR because of its periodic hello messages while AODV's end-to-end packet delay is the shortest when compared to DSR and CBRP.

关键词： Routing protocols Wireless networks Ad hoc networks Computational modeling Computer simulation Wireless communication Base stations Computer networks Laboratories Computer science

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Partitioning parallel simulation of wireless networks

Partitioning parallel simulation of wireless networks

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simulation Winter Conference

作者： A. Boukerche A. Fabbri Parallel Simulation and Distributed Systems PARADISE Research Laboratory Department of Computer Science University of North Texas Denton TX USA

We present a simulation testbed for wireless and mobile telecommunication systems, a two-stage PCS parallel simulation testbed which makes use of a conservative scheme at stage 1, and of time warp at stage 2. While time warp is considered to be an effective synchronization mechanism in parallel and distributed discrete event simulation (PDES) it is also well known for its instability due to rollbacks and its devastating effect, i.e., series of cascading rollbacks, among other factors. Thus, our primary goal is to study the impact and the importance of partitioning in our PCS model while reducing significantly the number of rollbacks.

关键词： Wireless networks Personal communication networks Time warp simulation Computational modeling System testing Solid modeling Telecommunication traffic Traffic control Memory management Computer simulation

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An adaptive partitioning algorithm for conservative parallel simulation

An adaptive partitioning algorithm for conservative parallel...

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International Symposium on parallel and distributed Processing (IPDPS)

作者： A. Boukerche Parallel Simulation and Distributed Systems PARADISE Research Laboratory Department of Computer Sciences University of North Texas Denton TX USA

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A performance comparison of routing protocols for ad hoc networks

A performance comparison of routing protocols for ad hoc net...

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International Symposium on parallel and distributed Processing (IPDPS)

作者： A. Boukerche Parallel Simulations and Distributed Systems (PARADISE) Research Laboratory University of North Texas USA

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Dynamic grid-based multicast group assignment in data distribution management

Dynamic grid-based multicast group assignment in data distri...

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International Workshop/Symposium on distributed simulation and Real-Time Applications (DS-RT)

作者： A. Boukerche A. Roy N. Thomas Parallel Simulation and Distributed Systems (PARADISE) Research Lab Computer Science Department University of North Texas USA

Data distribution management (DDM) is one of the services defined by the DoD High Level Architecture. DDM is necessary to provide efficient, scalable mechanisms for distributing state updates and interaction information in large scale distributed simulations. We describe data distribution management mechanisms (also known as filtering) used for real time training simulations. We propose a new DDM approach to multicast group allocation, which we refer to as a dynamic grid-based allocation. Our scheme is based on a combination of a fixed grid-based method, known for its low overhead and ease of implementation, and a sender-based strategy, which uses fewer multicast groups than the fixed grid-based method. We describe our DDM algorithm, its implementation, and report on the performance results that we have obtained using the RTI-Kit framework. These results include the outcome of experiments comparing our approach to the fixed grid-based method, and they show that our scheme is scalable and significantly reduces the message overhead of previous grid-based allocation schemes.

关键词： distributed decision making Computational modeling Management training Discrete event simulation Computer simulation Computer science Computer architecture Large-scale systems Filtering Multicast algorithms

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A synchronization scheme for distributed multimedia servers and mobile clients using quasi-sink

A synchronization scheme for distributed multimedia servers ...

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International Symposium on parallel and distributed Processing (IPDPS)

作者： A. Boukerche Sungbum Hong T. Jacob Parallel Simulation and Distributed Systems PARADISE Research Lab Department of Computer Sciences University of North Texas USA

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PERFORMANCE OF GZRP AD HOC ROUTING PROTOCOL

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Journal of Interconnection Networks 2001年第1期2卷 31-48页

作者： AZZEDINE BOUKERCHE STEVE ROGERS Parallel Simulations and Distributed Systems (PARADISE) Research Laboratory Department of Computer Sciences University of North Texas Denton TX 76203 USA

Ad hoc networks are useful for providing communication support where no fixed infrastructure exists or the deployment of a fixed infrastructure is not economically profitable, and movement of communicating parties is allowed. Therefore, such networks are designed to operate in widely varying environments, from military networks to low-power sensor networks and other embedded systems. Frequent topology changes caused by node mobility make routing in ad hoc wireless networks a challenging problem. In this paper, we propose an efficient ad hoc routing algorithm, which we refer to as GZRP, a hybrid protocol that makes use of the ZRP scheme and the Global Positioning System (GPS). As opposed to the ZRP original scheme, our GZRP scheme consists of propagating the routing (query) messages only to the nodes that are further away from the query source. We discuss the algorithm, its implementation, and report on the performance of GZRP scheme, and compare it to the ZRP routing protocol using an extensive simulation experiment. Our results indicate clearly that GZRP outperforms ZRP by reducing significantly the number of route query messages, and thereby increases the efficiency of the network load. Furthermore, we show that careful GPS screening angle is an important factor in the success of the GZRP ad hoc routing protocol.

关键词： Wireless Networks Ad Hoc Routing Protocol Zone Routing Protocol

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