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Frequency and Clock Tolerance Comments. Authors:. Date: 2008-09-09. Abstract. This presentation addresses comments concerning frequency and clock tolerance, CID 375-378; 380, 382-384. Frequency and Clock Tolerance.

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Frequency and clock tolerance comments
Frequency and Clock Tolerance Comments

Authors:

Date: 2008-09-09

Carl Kain, Noblis


Abstract
Abstract

This presentation addresses comments concerning frequency and clock tolerance, CID 375-378; 380, 382-384

Carl Kain, Noblis


Frequency and clock tolerance
Frequency and Clock Tolerance

  • Base standard specifies 10 ppm for both frequency and clock tolerance for 5 MHz channels

  • Base standard specifies 20 ppm for both frequency and clock tolerance for 10 MHz channels

  • TGp Draft 4.0 specifies 10 ppm for both frequency and clock tolerance for 10 MHz channels

  • Commenters who oppose tighter values want either rationale or are primarily are concerned with cost

Carl Kain, Noblis




Discussion
Discussion

  • Document 11-06-0878; Bob Sorrano of JHU discussed issue based on testing done on JHU campus

  • Conclusion was:

    • Results from initial testing using IEEE 802.11a devices as substitutes for 802.11p devices in a high speed environment indicated some problems could result in synching and maintaining signal lock which could be mitigated by requiring a more stringent frequency tolerance of ±10 ppm vs. the current ±20 ppm requirement that is sufficient for non-mobile and mobile platforms not required to communicate over high speeds.

  • Commenters have proposed an alternative

    • Make the 10 ppm values optional in the TGp amendment

Carl Kain, Noblis


Alternative recommendation
Alternative Recommendation

  • Recommend to make 10 ppm frequency tolerance and clock tolerance for 10 MHz BW in Clause 17 optional

  • Instruct the editor to make the following changes to 80211.p D4.0:

  • 17.3.9.4 Transmit center frequency tolerance

    • Insert the following statement after the first statement in 17.3.9.4:

    • An optional transmitted center frequency tolerance of ±10 ppm maximum for 10 MHz channels is recommended for use by a STA that has the MIB attribute dot11WAVEEnabled set to true.

  • 17.3.9.5 Symbol clock frequency tolerance

    • Insert the following statement after the first statement in 17.3.9.5:

    • An optional symbol clock frequency tolerance of ±10 ppm maximum for 10 MHz channels is recommended for use by a STA that has the MIB attribute dot11WAVEEnabled set to true.

  • Remove any PICs associated with previous “shall” statement for 10 ppm tolerance in 17.3.9.4 and 17.3.9.5 found in 802.11p D 4.0

  • Moved

  • Second

  • For

  • Against

  • Abstain

Carl Kain, Noblis


References
References

  • 802.11-06-0878-00-000r0

Carl Kain, Noblis