Telecom Requirements for Time and Frequency ... - GPS.gov

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Timing Technology: Frequency• Frequency accuracy (FFO) is thedifference in frequency betweenthe server clock and the recoveredclient clock over a time interval• Frequency targets– ± 32 ppm for Stratum 4 & 4E– ± 4.6 ppm for Stratum 3 & 3E– ± 50 ppb for GSM & WCDMA-FDD– ± 100 ppb for Home NodeBAccuracyFrequency (ppm)Slave ClockFrequencyAccuracyMasterClockTime (s)Thanks to Adam Wertheimer, Microsemi Co. for the use of this slide.© 2011 Microsemi Corporation.
Timing Technology: Phase• Alignment and PPS• Phase alignment is in addition tophase lock. Phase alignment alsoreferred to as Latency Correction.• Phase alignment has– Bounded phase offset between serverclock and recovered client clock– Bounded phase offset between differentrecovered client clocks• Phase alignment requires bi-directionalmechanism• Phase alignment targets– ± 1.25 µs for WCDMA-TDD– ± 3 µs for CDMA2000, CDMAone– ± 1 µs for WiMAX0 1Master Clock2Slave Clock 15 6 7Slave Clock 21 2 3Thanks to Adam Wertheimer, Microsemi Co. for the use of this slide.© 2011 Microsemi Corporation.
Page 1 and 2: Telecom Requirements for Timeand Fr
Page 3 and 4: Excerpts from WSTS• The NIST-ATIS
Page 5 and 6: Telecom Receivers are GenerallyStat
Page 7: Packet-Based Networks• The physic
Page 11 and 12: GPS/GNSS meets Stratum 1 Requiremen
Page 13 and 14: Time Synchronization via PTP• The
Page 15 and 16: Current Frequency Sync Requirements
Page 17 and 18: Requirements from ITU-T Q13/15Curre
Page 19 and 20: Excerpts from:Mobile standards & sy
Page 21 and 22: Mobile applications andSynchronizat
Page 23 and 24: CDMA 2000 SynchronizationRequiremen
Page 25 and 26: WCDMA Base Station TX Frequency Err
Page 27 and 28: LTE-TDD Phase SynchronizationRequir
Page 29 and 30: CoMP introduction (1/2)CoMP = Coord
Page 31 and 32: CoMP-JP time/phase synchronization
Page 33 and 34: SummaryTo operate CoMP Joint Proces
Page 35 and 36: Sync from GNSS at ~100 ns• At a f

Telecom Requirements for Time and Frequency ... - GPS.gov

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