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1. (WO2017150306) COMMUNICATION SYSTEM, BACKUP COMMUNICATION DEVICE, MAIN COMMUNICATION DEVICE, TIME SYNCHRONIZATION METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM

Pub. No.:    WO/2017/150306    International Application No.:    PCT/JP2017/006626
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Thu Feb 23 00:59:59 CET 2017
IPC: H04W 56/00
H04L 7/00
H04L 12/70
H04W 24/04
Applicants: NEC CORPORATION
日本電気株式会社
Inventors: OTSU Makoto
大津 誠
Title: COMMUNICATION SYSTEM, BACKUP COMMUNICATION DEVICE, MAIN COMMUNICATION DEVICE, TIME SYNCHRONIZATION METHOD, AND NON-TRANSITORY COMPUTER-READABLE MEDIUM
Abstract:
A communication system according to the present invention is provided with a communication device (10), a communication device (20), and a communication device (30) which is a backup communication device for the communication device (20). The communication device (20) includes: a counter (21) which is synchronized with a counter value held by the communication device (10); and a correction unit (22) which corrects, by using the counter (21), time information included in a time synchronization packet transmitted to and from the communication device (10). The communication device (30) includes: a counter (31) which is synchronized with a counter value of the counter (21) before a failure occurs in the communication device (20); and a correction unit (32) which corrects, by using the counter (31), time information included in a time synchronization packet transmitted to and from the communication device (10), after a failure occurs in the communication device (20).