Institute for Systems Research

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Author: search.filters.author.Corson, M. ScottSubject: search.filters.subject.multi-user systems

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    A Channel Probing Scheme for Wireless Networks
    (2000) Zhu, Chenxi; Corson, M. Scott; Corson, M. Scott; ISR
    A channel probing scheme for wireless networks is presented. By transmittinga probing signal in a channel and measuring the signal-to-interferenceratio (SIR), a link can estimate the channel condition and predict therequired transmission power without fully powering up. The channel probingscheme can be used as part of a distributed channel allocation algorithm,and simulations have shown that it outperforms some other comparableschemes.
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    An Evolutionary-TDMA Scheduling Protocol (E-TDMA) for Mobile Ad Hoc Networks
    (1998) Zhu, C.; Corson, M. Scott; Corson, M. Scott; ISR; CSHCN
    A new single channel, time division multiple access (TDMA) schedulingprotocol, termed "Evolutionary-TDMA", is presented for mobile ad hocnetworks. The protocol allows nodes in an ad hoc network to reserveconflict-free TDMA slots for transmission to their neighbors. Two topology-dependent schedules are generated and maintained simultaneously. One is a broadcast schedule inwhich every node has one slot to transmit to all its neighbors. The other isa flexible schedule in which a node can reserve multiple slotsfor transmission of unicast, multicast and broadcast traffic. The schedules are reasonably bandwidth efficient and are frequently updated in an evolutionary manner to maintain conflict-free transmissions. The protocol executes across the entire network simultaneously in a fully distributed and parallel fashion. To react quickly to changing topology and bandwidth demands and to keep overhead low,participating nodes need only coordinate with their one-hop neighbors.Traffic prioritization and Quality of Service (QoS) can be supported with this protocol. Its performance, in terms of both scheduling quality and scheduling overhead, is insensitive to network size. Thus,it is a scalable protocol suitable for very large networks, and networks of varying size.
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    A Distributed, Object-Oriented Communication Network Simulation Testbed
    (1992) Corson, M. Scott; ISR
    The Distributed Network Simulation Testbed is a research tool designed to aid users in the modeling and performance analysis of communication protocols. The testbed can be used to model communication networks consisting of mobile and/or immobile nodes communicating over broadcast and/or point-to-point channels. Its object-oriented design permits users to utilize previously developed modules and, when necessary, to derive new modules which are subsequently added to the testbed. The testbed, implemented in Sim ++, can run either sequentially on a single processor or in parallel on multiple processors. An object- oriented, graphical user interface allows users to monitor simulation progress for both demonstration and debugging and permits users to graphically construct network simulations from existing testbed components.