parallel and distributedsimulation techniques have been investigated in a number of studies to decrease the execution times of PCS network simulations. In this paper, we consider distributedsimulation of PCS models ...
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parallel and distributedsimulation techniques have been investigated in a number of studies to decrease the execution times of PCS network simulations. In this paper, we consider distributedsimulation of PCS models using a two-state PCS simulation testbed which makes use of a conservative scheme at Stage 1, and of Time Warp at Stage 2, and focus upon the load balancing issue. We investigate and study several load balancing schemes for TDMA systems. Extensive simulation experiments were conducted on a cluster of workstations using a real suburban area serviced by an FCA-based PCS networks. Our results indicate clearly that careful load balancing scheme is important in the success of the PCS simulation model.
The advances in mobile computing and distributed multimedia systems allow mobile hosts (clients) to access wireless multimedia systems anywhere at anytime, but not without creating a new set of issues and trade-offs. ...
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The advances in mobile computing and distributed multimedia systems allow mobile hosts (clients) to access wireless multimedia systems anywhere at anytime, but not without creating a new set of issues and trade-offs. To the best of our knowledge, there has been very little research done to deal with the synchronization problem in wireless and mobile multimedia systems. We propose an efficient distributed synchronization algorithm for wireless and mobile multimedia systems to ensure and facilitate mobile clients' access of multimedia objects. We describe our synchronization scheme, which we refer to as MoSync, its implementation, and report on the performance results that we have obtained using a discrete event simulation testbed we have developed. Our results indicate clearly that our synchronization scheme is a viable approach to a wireless multimedia environment.
Wireless networking technologies and mobile cellular communication systems are growing at an ever faster rate, and this is likely to continue in the foreseeable future. Higher reliability, better coverage and services...
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Wireless networking technologies and mobile cellular communication systems are growing at an ever faster rate, and this is likely to continue in the foreseeable future. Higher reliability, better coverage and services, higher capacity, mobility management, and wireless multimedia are all parts of the potpourri. The evolution of new systems and improved designs will always depend on the ability to predict system performance using analytical or simulation methods. To date, mathematical analysis has brought some insight into the design of such systems, but analytical methods are often not general or detailed enough for evaluation and comparison of various proposed mobile and/or wireless systems and their services. distributedsimulation techniques have been investigated in a number of studies to decrease the execution times of PCS simulations. We study the load balancing problem for PCS wireless simulationsystems, and focus upon static strategies in order to reduce the synchronization overhead of SWiMNet, a parallel PCS simulation testbed developed at UNT.
A mobile ad-hoc network (Manet) is a system of wireless mobile nodes dynamically self-organizing in arbitrary and temporary network topologies. People and vehicles can thus be internetworked in areas without a pre-exi...
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ISBN:
(纸本)0780370015
A mobile ad-hoc network (Manet) is a system of wireless mobile nodes dynamically self-organizing in arbitrary and temporary network topologies. People and vehicles can thus be internetworked in areas without a pre-existing communication infrastructure, or when the use of such infrastructure requires wireless extension. 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. We focus upon routing protocols for ad hoc networks. We study and compare the performance of several routing protocols. A variety of workload and scenarios using a variety of mobility, load and size of the ad hoc network were simulated.
In some scenarios involving online transaction processing within a distributed database, it is desirable to synchronize transactions in a manner that guarantees conflict equivalence with a serial schedule ordered by o...
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In some scenarios involving online transaction processing within a distributed database, it is desirable to synchronize transactions in a manner that guarantees conflict equivalence with a serial schedule ordered by original transaction start times while providing each transaction with an anomaly-serializable isolation. Few theoretical concurrency control algorithms guarantee such a conflict equivalence, and we are unaware of any protocol that accomplishes this while supporting real-world issues such as out-of-order transaction messages, out-of-order operation executions and out-of-order transaction committals without the burden of explicit read-set and write-set declarations. We describe an algorithm called T3C (Temporally Correct Concurrency Control) that provides this guarantee and supports these issues while requiring only table-level write-set declarations.
This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the comb...
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This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.
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