Institute for Systems Research Technical Reports

Permanent URI for this collectionhttp://hdl.handle.net/1903/4376

This archive contains a collection of reports generated by the faculty and students of the Institute for Systems Research (ISR), a permanent, interdisciplinary research unit in the A. James Clark School of Engineering at the University of Maryland. ISR-based projects are conducted through partnerships with industry and government, bringing together faculty and students from multiple academic departments and colleges across the university.

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Author: search.filters.author.Corson, M. ScottSubject: search.filters.subject.Intelligent Signal Processing and Communications Systems

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    An Approach to Fixed/Mobile Converged Routing
    (2000) Corson, M. Scott; O'Neill, Alan; ISR; CSHCN
    We consider a family of routing protocols for networks in which the core topology is essentially fixed by where the end systems may be mobile. We refer to this form of routing as Fixed/Mobile Converged (FMC) routing.

    This is a mixture of the traditional prefix-routed scenario fo the fixed Internet, and the classical edge mobility scenario that is today supported by cellularnetworks, primarily as part of the cellular technology elements (GSM, GPRS, etc.).

    We outline a general architecture for the support of such edge mobility, and present an approach to FMC routing that fits within this architecture. We then present initial simulation resultsillustrating the potential scalability and routing efficiency of this approach.

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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.