公开(公告)号：US20150085852A1

公开(公告)日：2015-03-26

申请号：US14454237

申请日：2014-08-07

Applicant: Hitachi, Ltd.

Inventor： Masahiko MIZUTANI ,  Hiroaki NAKAZAWA ,  Yoshihiro ASHI ,  Daiji MITSUNAGA ,  Hideyuki NAKANISHI

IPC: H04L7/00 ,  H04W56/00

CPC classification number: H04J3/0667 ,  H04J3/0673 ,  H04L43/0852 ,  H04L43/0858

Abstract: In an extensive distribution system with no delay guarantee network used as a relay network, an influence of a fluctuation of a communication delay time is avoided to conduct a high-precision time synchronization. First and second delay control devices installed in junctions between communication networks and a relay network, respectively, have functions of retaining first and second time information, and setting a first relay network passing time of a first communication signal directed from a time dissemination device toward a time receiving device through a relay network, and a second relay network passing time of a second communication signal directed from the time receiving device toward the time dissemination device, respectively. In measurement of communication delay time of the first communication network and the second communication network prior to time synchronization, the first and second relay network passing times are unified in advance to exclude uncertainty of the communication time.

Abstract translation: 在广泛的分配系统中，没有延迟保证网络用作中继网络，避免了通信延迟时间的波动对高精度时间同步的影响。 分别安装在通信网络和中继网络之间的接合处的第一和第二延迟控制装置具有保留第一和第二时间信息的功能，并且将从时间传播装置引导的第一通信信号的第一中继网络通过时间设置为 时间接收装置，以及第二中继网络，分别从时间接收装置向时间传播装置通过第二通信信号的时间。 在时间同步之前测量第一通信网络和第二通信网络的通信延迟时间，第一和第二中继网络通过时间被预先统一以排除通信时间的不确定性。