Method for time synchronization of domain based on time information of vehicle

Patent metadata

Field	Value
Publication number	US-2017195982-A1
Application number	US-201615392175-A
Country	US
Kind code	A1
Filing date	Dec 28, 2016
Priority date	Jan 6, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

A time synchronization method performed by a communication node in a vehicle includes: receiving, from a road side unit (RSU), a first frame including time information of a first domain to which the RSU belongs; setting a time of the vehicle based on a time indicated by the time information of the first domain; and transmitting a second frame including the time information of the vehicle.

First claim

What is claimed is:

1 . A time synchronization method performed by a communication node in a vehicle, the method comprising:
receiving, from a road side unit (RSU), a first frame including time information of a first domain to which the RSU belongs; setting a time of the vehicle based on a time indicated by the time information of the first domain; and transmitting a second frame including the time information of the vehicle.

2 . The time synchronization method according to claim 1 , wherein the first frame includes an identifier indicating a type of the first domain and position information of the first domain.

3 . The time synchronization method according to claim 1 , further comprising setting the time of the vehicle based on the time information of the first domain when the first domain is a universal time domain.

4 . The time synchronization method according to claim 1 , further comprising measuring a link delay time between the communication node and the RSU, wherein the time of the vehicle is set to a sum of the time indicated by the time information of the first domain and the measured link delay time.

5 . The time synchronization method according to claim 1 , wherein the RSU is a grand master node of the first domain.

6 . The time synchronization method according to claim 1 , further comprising:
receiving the first frame through a service channel between the vehicle and the first domain; and transmitting the second frame through a service channel between the vehicle and a second domain.

7 . The time synchronization method according to claim 1 , wherein the second frame includes an identifier indicating a type of the first domain, update time information indicating a time at which the time of the vehicle is updated, and position information of the first domain.

8 . The time synchronization method according to claim 1 , further comprising transmitting the second frame when the vehicle is located within a second domain.

9 . The time synchronization method according to claim 8 , wherein the second domain is a working clock domain.

10 . A time synchronization method performed by a road side unit (RSU) of a working clock domain, the method comprising:
receiving, from a communication node in a vehicle, a synchronization frame including time information of the vehicle; and setting a time of the RSU based on a time indicated by the time information of the vehicle, wherein the time indicated by the time information of the vehicle is synchronized with a time of a universal time domain.

11 . The time synchronization method according to claim 10 , further comprising measuring a link delay time between the RSU and the communication node, wherein the time of the RSU is set to a sum of the time indicated by the time information of the vehicle and the measured link delay time.

12 . The time synchronization method according to claim 10 , further comprising receiving the synchronization frame through a service channel between the working clock domain and the vehicle.

13 . The time synchronization method according to claim 10 , wherein the synchronization frame includes update time information indicating a time at which the time of the vehicle is updated, an identifier of the universal time domain, and position information of the universal time domain.

14 . The time synchronization method according to claim 13 , further comprising setting the time of the RSU based on a time indicated by a synchronization frame having a latest update time among a plurality of synchronization frames when the plurality of synchronization frames are received.

15 . The time synchronization method according to claim 13 , further comprising setting the time of the RSU based on a synchronization frame from a universal time domain closest to the RSU among a plurality of synchronization frames when the plurality of synchronization frames are received.

16 . The time synchronization method according to claim 10 , wherein the RSU is a grand master node of the working clock domain.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp
• Industry-Univ Coop Found Hanyang Univ

Inventors

• Park Seong Jin
• Kim Woo Sub
• Park Sungkwon
• Lee Ju Ho

Classifications

• H04J3/0641

  Change of the master or reference, e.g. take-over or failure of the master · CPC title

• H04J3/0667

  Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays (arrangements for monitoring round trip delays in packet switching networks H04L43/0864) · CPC title

• H04B1/3822

  specially adapted for use in vehicles (H04B1/3827 takes precedence) · CPC title

• H04W56/0015 Primary

  one node acting as a reference for the others · CPC title

• H04J3/0638

  Clock or time synchronisation among nodes; Internode synchronisation (synchronization for ring networks H04L12/422; data switching networks with synchronous transmission H04L12/43) · CPC title