Devices and methods for handling precise timing protocol frames

Patent metadata

Field	Value
Publication number	US-12439349-B2
Application number	US-201917297802-A
Country	US
Kind code	B2
Filing date	Oct 15, 2019
Priority date	Nov 27, 2018
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A method performed by a transmitting device, in a 3GPP wireless communication 5 system (100), for handling generalized Precise Timing Protocol (gPTP) signaling, from a Time Sensitive Network (TSN) is provided. The transmitting device receives (1301) a gPTP frame from the TSN network. The gPTP frame comprises time information, an indication of a time domain related to the time information and/or a Medium Access Control (MAC) address of a second end station connected to a receiving device. Based 10 on the indication of the time domain and/or the MAC address, the transmitting device determines (1302) the receiving device which the gPTP frame relates to. The transmitting device transmits (1304), to the determined receiving device, the gPTP frame in a PDU session related to the determined receiving device.

First claim

The invention claimed is:

1. A method, performed by a transmitting device, in a 3GPP wireless communication system, for handling generalized Precise Timing Protocol (gPTP) signaling, from a Time Sensitive Network (TSN), the method comprising:
receiving, by the transmitting device in the 3GPP wireless communication system, from the TSN network, a gPTP frame that comprises time information, wherein the gPTP frame further comprises an indication of a time domain related to the time information and/or a Medium Access Control (MAC) address of a second end station in the TSN network, the second end station being connected to a receiving device in the 3GPP wireless communication system, the indication of the time domain including a domain number identifying one of a plurality of time domains, each time domain having an independent clock;
determining, by the transmitting device, based on the indication of the time domain and/or the MAC address, the receiving device to which the gPTP frame relates, wherein determining to which receiving device the gPTP frame relates comprises:
obtaining information regarding the time domain to which the receiving device and/or one or more second end stations connected to the receiving device are related, by at least one of, a) receiving the information from the receiving device, b) receiving a pre-configuration indicating which receiving devices are related to a specific time domain, and c) receiving from a TSN network controller information that comprises a receiving device identifier or a MAC address of the one or more second end stations; and
determining that the received gPTP frame relates to the receiving device when the indication of the time domain or the MAC address comprised in the gPTP frame corresponds to the obtained information regarding the time domain to which the receiving device and/or the one or more second end stations connected to the receiving device are related; and

transmitting, by the transmitting device, to the determined receiving device, the gPTP frame in a Protocol Data Unit (PDU) session related to the determined receiving device.

2. The method according to claim 1 , wherein the method further comprises setting a first time stamp on the gPTP frame when the gPTP frame is received and/or transmitted by the transmitting device, wherein the first time stamp is usable to calculate a correction time for compensating for varying delays in the 3GPP wireless communication system.

3. The method according to claim 1 , wherein the receiving device identifier comprises a user equipment (UE) identifier.

4. A non-transitory computer-readable storage medium on which is stored a computer program that, when executed by a transmitting device in a 3GPP wireless communication system, causes the transmitting device to handle generalized Precise Timing Protocol (gPTP) signaling from a Time Sensitive Network (TSN), the computer program causing the transmitting device to:
receive, from the TSN network, a gPTP frame that comprises time information, wherein the gPTP frame further comprises an indication of a time domain related to the time information and/or a Medium Access Control (MAC) address of a second end station in the TSN network, the second end station being connected to a receiving device in the 3GPP wireless communication system, the indication of the time domain including a domain number identifying one of a plurality of time domains, each time domain having an independent clock;
determine, based on the indication of the time domain and/or the MAC address, the receiving device to which the gPTP frame relates, wherein the computer program causes the transmitting device to determine to which receiving device the gPTP frame relates by:
obtaining information regarding the time domain to which the receiving device and/or one or more second end stations connected to the receiving device are related, by at least one of, a) receiving the information from the receiving device, b) receiving a pre-configuration indicating which receiving devices are related to a specific time domain, and c) receiving from a TSN network controller information that comprises a receiving device identifier; and
determining that the received gPTP frame relates to the receiving device when the indication of the time domain or the MAC address comprised in the gPTP frame corresponds to the obtained information regarding the time domain to which the receiving device and/or the one or more second end stations connected to the receiving device are related; and

transmit, to the determined receiving device, the gPTP frame in a Protocol Data Unit (PDU) session related to the determined receiving device.

5. A method, performed by a receiving device, in a 3GPP wireless communication system, for handling generalized Precise Timing Protocol (gPTP) signaling, from a Time Sensitive Network (TSN), the method comprising:
receiving, by the receiving device in the 3GPP wireless communication system, from a transmitting device in the 3GPP wireless communication system, a Protocol Data Unit (PDU) session comprising a gPTP frame that comprises time information, wherein the gPTP frame further comprises an indication of a time domain related to the time information and/or a Medium Access Control (MAC) address, the indication of the time domain including a domain number identifying one of a plurality of time domains, each time domain having an independent clock;
determining, by the receiving device, based on the indication of the time domain and/or the MAC address, one or more second end stations in the TSN network to which to transmit the received gPTP frame; and
transmitting, by the receiving device, to the one or more second end stations in the TSN network, the gPTP frame, wherein the gPTP frame comprises the time information and the time domain related to the time information extracted from the 3GPP message, wherein the information regarding the time domain supported by the one or more second end stations in the TSN, is obtained by at least one of:
a) receiving a gPTP message delivered periodically by the one or more second end stations;
b) receiving information from a TSN network controller, wherein the information comprises a receiving device identifier or a MAC address of the one or more second end stations; and
c) detecting an interest of one or more second end stations in a time domain by forwarding a gPTP frame of the time domain to the one or more second end stations, and monitoring a potential reply to the gPTP transmission from the one or more second end stations.

6. The method according to claim 5 , wherein when the PDU session is received as a broadcasted message, and wherein the method further comprises transmitting, to the one or more second end stations, the broadcasted time information, when the broadcasted PDU session relates to a time domain supported by the one or more second end stations of the TSN.

7. The method according to claim 5 , wherein the information regarding the time domain supported by the one or more second end stations in the TSN is received from the one or more second end stations either by:
receiving a gPTP message delivered periodically by the one or more second end stations; or
detecting an interest of one or more second end stations in a time domain by forwarding a gPTP frame of the time domain to the one or more second end stations, and monitoring a potential reply to the gPTP transmission from the one or more second end stations;

wherein the information regarding the time domain supported by the one or more second end stations in the TSN is forwarded to the transmitting device.

8. The method according to claim 5 , wherein the method further comprises:
setting a second time stamp on the gPTP frame when the PDU session

Assignees

• Ericsson Telefon Ab L M

Inventors

• Munz Hubertus
• Wang Kun
• Ruffini Stefano
• Zou Zhenhua
• Diachina John Walter
• Dudda Torsten
• Schliwa-Bertling Paul

Classifications

• H04J3/0667 Primary

  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

• H04L12/4625

  Single bridge functionality, e.g. connection of two networks over a single bridge · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title

• H04J3/0641

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

• H04J3/0673

  using intermediate nodes, e.g. modification of a received timestamp before further transmission to the next packet node, e.g. including internal delay time or residence time into the packet · CPC title