ZipTx: Harnessing Partial Packets in 802.11 Networks

Ching-Ju Lin, Nate Kushman, Dina Katabi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

52 Scopus citations

Abstract

Current wireless protocols retransmit any packet that fails the checksum test, even when most of the bits are correctly received. Prior work has recognized this inefficiency, however the proposed solutions (e.g., PPR, HARQ and SOFT) require changes to the hardware and physical layer, and hence are not usable in today's WLANs and mesh networks. They are further tested in channels with fixed modulation and coding, whereas production 802.11 networks adapt their modulation and codes to maximize their ability to correct erroneous bits. This paper makes two key contributions: 1) it introduces ZipTx, a software-only solution that harvests the gains from using correct bits in corrupted packets using existing hardware, and 2) it characterizes the true gains of partially correct packets for the entire range of operation of 802.11 networks, and in the presence of adaptive modulation and error correcting codes. We implement ZipTx as a driver extension and evaluate our implementation in both outdoor and indoor environments, showing that ZipTx significantly improves the throughput.

Original languageEnglish
Title of host publicationMobiCom'08 - Proceedings of the 14th ACM International Conference on Mobile Computing and Networking
PublisherASSOC COMPUTING MACHINERY
Pages351-362
Number of pages12
ISBN (Print)9781605583426
DOIs
StatePublished - Sep 2008
Event14th Annual International Conference on Mobile Computing and Networking, MobiCom 2008 - San Francisco, CA, United States
Duration: 14 Sep 200819 Sep 2008

Publication series

NameProceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM

Conference

Conference14th Annual International Conference on Mobile Computing and Networking, MobiCom 2008
CountryUnited States
CitySan Francisco, CA
Period14/09/0819/09/08

Keywords

  • 802.11
  • Coding
  • Reed solomon
  • Wireless

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