METHOD FOR DETECTING SYNCHRONIZATION DEVIATION BETWEEN COMMUNICATION STATIONS

WIPO Patent Application WO/2017/138313

A1

The time of transmission and reception between stations A and B is exchanged, and any deviation in time is calculated in a corresponding manner in the stations. Using the transmission time TXA from station A to B, the transmission time TYB from station B to A, the time TXB of a clock at station B in a transmission from station A to station B, and the clock time TYA at station A in a transmission from station B to A, the following are measured in sequence: 1) station A records the time TXA at which TXA and TYA were transmitted, 2) station B measures the time TXB at which TXA and TYA were received, 3) station B records the time TYB at which TXB and TYB were transmitted, and 4) station A measures the time TYA at which TXB and TYB were received, the transfer length of time between stations A and B being derived for each station on the basis of the average of the increase ΔTXB-A from TXA to TXB and the increase ΔTYA-B from TYB to TYA, or the deviation in time for a transfer between stations A and B being determined by subtracting the increase ΔTXB-A from the transfer length of time. The transmission time TXA from station A to B may also be measured using a reflection signal from a transmission terminal.

SHIGA NOBUYASU (JP)
INOUE MASUGI (JP)
YASUDA SATOSHI (JP)
KIDO KOHTA (JP)

PCT/JP2017/001498

August 17, 2017

January 18, 2017

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NAT INST INF & COMM TECH (JP)

H04L7/00; G04G7/00

US7221686B1	2007-05-22
JPH1127269A	1999-01-29
JP2012105152A	2012-05-31
JP2009520401A	2009-05-21

FUKUDA Shinichi et al. (JP)

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