Method for processing a packet in a time-synchronized network and network element for processing a packet in a network

1. A method for processing a packet in a time-synchronized network, the method comprising:

receiving, by a first network element, a first data packet to be transmitted to a second network element via a third network element;

adding, by the first network element, a header to the first data packet;

adding, by the first network element, time information associated with the first data packet to the header; and

transmitting, by the first network element, the first data packet with the header to the third network element,

wherein the time information includes a first time when the first network element receives the first data packet,

the header is a general packet radio service tunneling protocol (GTP) header, and

the first data packet includes a time sensitive data frame to be transmitted at a data link layer using an unstructured frame.

2. The method of claim 1 , wherein the time information further includes at least one of a second time when the third network element should receive the first data packet and a third time when the first data packet should be delivered to the second network element.

3. The method of claim 2 , wherein the third network element calculates a time spent passing from the first network element to the third network element by using a difference between a time when the first network receives the first data packet and a time when the third network element transmits the first data packet.

4. The method of claim 3 , wherein the third network element puts the spent time into a correction field of a precision time protocol (PTP).

5. The method of claim 2 , wherein the third time is represented using a minimum time at which the first data packet should be delivered to the second network element and a maximum time at which the first data packet should be delivered to the second network element.

6. The method of claim 2 , wherein the third time is represented using a minimum time that a network can occupy for delivering the first data packet to the second network element and a maximum time that a network can occupy for delivering the first data packet to the second network element.

7. The method of claim 2 , wherein the first to third times are one of a natural time and an epoch time.

8. The method of claim 1 , wherein the adding the first time information includes creating, by the first network element, an extension indicating a time in the GTP header and recording the time information in the extension.

9. The method of claim 1 , wherein the time sensitive data frame is a precision time protocol (PTP) frame.

10. The method of claim 1 , wherein:

the first network element is a NW-TT (network TSN (time sensitive networking) translator) or a UPF (user plane function),

the third network element is user equipment or a DS-TT (device side TSN translator), and

the second network element is a TSN end station.

11. The method of claim 1 , wherein:

the first network element is a DS-TT (device side TSN (time sensitive networking) translator) or user equipment,

the third network element is a UPF (user plane function) or a NW-TT (network TSN translator), and

the second network element is a TSN end station.

12. A first network element for processing a packet in a network, the first network element comprising:

a network interface configured to receive a first data packet to be transmitted to a second network element via a third network element; and

a processor configured to add a header including time information associated with the first data packet to the first data packet and control transmitting the first data packet with the header to the third network element,

wherein the time information includes a first time when the first network element receives the first data packet,

the header is a general packet radio service tunneling protocol (GTP) header, and

the first data packet includes a time sensitive data frame to be transmitted at a data link layer using an unstructured frame.

13. The first network element of claim 12 , wherein the time information further includes at least one of a second time when the third network element should receive the first data packet and a third time when the first data packet should be delivered to the second network element.