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    block this user An-Ping Li

    Research Fellow

    Beijing 100085, P.R.China

    Simple Models for Performance Evaluation of a Class of Two-Hop Relay Protocols

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    We evaluate the performance of a class of two-hop relay protocols for mobile ad hoc networks via simple models. The focus is on the multicopy two-hop relay protocol, where the source may generate multiple copies of a packet and use relay nodes to transmit the packet (or a copy) to its destination, and on the two-hop relay protocol with erasure coding, where a piece of information is fragmented into n blocks in such a way that the destination may decode the data if it receives at least k blocks. Performance metrics of interest are the time to deliver a single packet to its destination, the number of copies of the packet at delivery instant, and the total number of copies that the source generates; the latter number will be larger when TTLs are associated with the copies of a packet, a situation that we address. We also investigate the case where the number of copies of a packet currently in the network is limited so as to limit the energy consumption. Performance metrics are obtained in closed-from for the multicopy two-hop relay protocol in the case of exponential inter-meeting times, exponential TTLs and when the number of copies of the packet in the network is limited. We evaluate the impact of constant TTLs as opposed to exponential TTLs, and we develop an approximation analysis in the case where the inter-meeting times are arbitrarily distributed. In particular, we show that exponential inter-meeting times yield stochastically smaller delivery delays than hyper-exponential inter-meeting times; we also show that exponential TTLs yield larger expected delivery delays than constant TTLs. Finally, we characterize the delivery delay in the two-hop relay protocol with erasure coding and compare this scheme with the multicopy routing scheme.

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    Description

    Title : Simple Models for Performance Evaluation of a Class of Two-Hop Relay Protocols
    Abstract : We evaluate the performance of a class of two-hop relay protocols for mobile ad hoc networks via simple models. The focus is on the multicopy two-hop relay protocol, where the source may generate multiple copies of a packet and use relay nodes to transmit the packet (or a copy) to its destination, and on the two-hop relay protocol with erasure coding, where a piece of information is fragmented into n blocks in such a way that the destination may decode the data if it receives at least k blocks. Performance metrics of interest are the time to deliver a single packet to its destination, the number of copies of the packet at delivery instant, and the total number of copies that the source generates; the latter number will be larger when TTLs are associated with the copies of a packet, a situation that we address. We also investigate the case where the number of copies of a packet currently in the network is limited so as to limit the energy consumption. Performance metrics are obtained in closed-from for the multicopy two-hop relay protocol in the case of exponential inter-meeting times, exponential TTLs and when the number of copies of the packet in the network is limited. We evaluate the impact of constant TTLs as opposed to exponential TTLs, and we develop an approximation analysis in the case where the inter-meeting times are arbitrarily distributed. In particular, we show that exponential inter-meeting times yield stochastically smaller delivery delays than hyper-exponential inter-meeting times; we also show that exponential TTLs yield larger expected delivery delays than constant TTLs. Finally, we characterize the delivery delay in the two-hop relay protocol with erasure coding and compare this scheme with the multicopy routing scheme.
    Subject : unspecified
    Area : Mathematics
    Language : English
    Affiliations
    Url : http://www-sop.inria.fr/maestro/personnel/Ahmad.Al_Hanbali/PUBLICATIONS/infocom07.pdf
    Doi : 10.1.1.61.5200

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    An-Ping's Peer Evaluation activity

    Emailed by 1
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    Downloads 722
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