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A high-throughput path metric for multi-hop wireless routing

Published: 14 September 2003 Publication History
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  • Abstract

    This paper presents the expected transmission count metric (ETX), which finds high-throughput paths on multi-hop wireless networks. ETX minimizes the expected total number of packet transmissions (including retransmissions) required to successfully deliver a packet to the ultimate destination. The ETX metric incorporates the effects of link loss ratios, asymmetry in the loss ratios between the two directions of each link, and interference among the successive links of a path. In contrast, the minimum hop-count metric chooses arbitrarily among the different paths of the same minimum length, regardless of the often large differences in throughput among those paths, and ignoring the possibility that a longer path might offer higher throughput.This paper describes the design and implementation of ETX as a metric for the DSDV and DSR routing protocols, as well as modifications to DSDV and DSR which allow them to use ETX. Measurements taken from a 29-node 802.11b test-bed demonstrate the poor performance of minimum hop-count, illustrate the causes of that poor performance, and confirm that ETX improves performance. For long paths the throughput improvement is often a factor of two or more, suggesting that ETX will become more useful as networks grow larger and paths become longer.

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    cover image ACM Conferences
    MobiCom '03: Proceedings of the 9th annual international conference on Mobile computing and networking
    September 2003
    376 pages
    ISBN:1581137532
    DOI:10.1145/938985
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Publication History

    Published: 14 September 2003

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    Author Tags

    1. 802.11b
    2. DSDV
    3. DSR
    4. ETX
    5. ad hoc networks
    6. multi-hop wireless networks
    7. rooftop networks
    8. route metrics
    9. wireless routing

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    MobiCom '03 Paper Acceptance Rate 27 of 281 submissions, 10%;
    Overall Acceptance Rate 440 of 2,972 submissions, 15%

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