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Frequency and Clock Tolerance Comments

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

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  1. Frequency and Clock Tolerance Comments Authors: Date: 2008-09-09 Carl Kain, Noblis

  2. Abstract This presentation addresses comments concerning frequency and clock tolerance, CID 375-378; 380, 382-384 Carl Kain, Noblis

  3. 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

  4. Comments From Master Spreadsheet Carl Kain, Noblis

  5. Comments From Master Spreadsheet Carl Kain, Noblis

  6. 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

  7. 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

  8. References • 802.11-06-0878-00-000r0 Carl Kain, Noblis

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