Apparatus and method for providing synchronization information of first communication network to second communication network in communication system

1. A method of a network exposure function (NEF) in a communication system, the method comprising:

receiving, from an application function (AF), a synchronization information including at least one of a valid time, a time domain for a time synchronization service, a generic public subscription identifier (GPSI), an external group ID, or a synchronization clock domain;

generating a synchronization activation request message based on the synchronization information;

receiving, from a policy control function (PCF), a notification message indicating a packet data unit (PDU) session; and

transmitting, to at least one of a user equipment (UE) and a user plane function (UPF), the synchronization activation request message,

wherein the synchronization activation request message includes at least one of an international mobile subscriber identity (IMSI), an internal group ID, or a grandmaster (GM) clock domain,

wherein the IMSI is transformed from the GPSI,

wherein the internal group ID is transformed from the external group ID, and

wherein the GM clock domain is transformed from the synchronization clock domain.

2. The method of claim 1 , further comprising:

transmitting, to a unified data management (UDM), the synchronization activation request message,

wherein the synchronization activation request message is stored in a unified data repository (UDR).

3. The method of claim 1 , further comprising:

transmitting, to the AF, a response message in response to the synchronization information,

wherein the response message includes the synchronization activation request message.

4. A method of a user equipment (UE) in a communication system, the method comprising:

transmitting a packet data unit (PDU) session request message to a network entity of a first communication network;

receiving a synchronization activation request message from the network entity in response to the PDU session request message, based on a valid time for a time synchronization service;

generating a synchronization message based on the synchronization activation request message; and

transmitting the synchronization message to a communication node of a second communication network,

wherein the synchronization activation request message is generated based on a synchronization information including at least one of the valid time, a time domain for a time synchronization service, a generic public subscription identifier (GPSI), an external group ID, or a synchronization clock domain,

wherein the synchronization activation request message includes at least one of an international mobile subscriber identity (IMSI), an internal group ID, or a grandmaster (GM) clock domain,

wherein the IMSI is transformed from the GPSI,

wherein the internal group ID is transformed from the external group ID, and

wherein the GM clock domain is transformed from the synchronization clock domain.

5. The method of claim 4 , wherein the synchronization activation request message is generated further based on a bridge management information container (BMIC) for a number of domain (domain #n) or a port management information container (PMIC).

6. The method of claim 4 , wherein the synchronization message is generated based on a grandmaster (GM) clock of the first communication network.

7. The method of claim 4 , wherein the UE operates as a device-side time sensitive networking (TSN) translator (DS-TT).

8. The method of claim 4 , wherein the PDU session request message includes information related to at least one of data network name/single-network slice selection assistance information (DNN/S-NSSAI), PDU session type, capability of the UE, or a device type of the UE.

9. A method of a user plane function (UPF) in a communication system, the method comprising:

transmitting a packet data unit (PDU) session request message to a network entity of a first communication network;

receiving a synchronization activation request message from the network entity in response to the PDU session request message, based on a valid time for a time synchronization service;

generating a synchronization message based on the synchronization activation request message; and

transmitting the synchronization message to a communication node of a second communication network,

wherein the synchronization activation request message is generated based on a synchronization information including at least one of the valid time, a time domain for a time synchronization service, a generic public subscription identifier (GPSI), an external group ID, or a synchronization clock domain,

wherein the synchronization activation request message includes at least one of an international mobile subscriber identity (IMSI), an internal group ID, or a grandmaster (GM) clock domain,

wherein the IMSI is transformed from the GPSI,

wherein the internal group ID is transformed from the external group ID, and

wherein the GM clock domain is transformed from the synchronization clock domain.

10. The method of claim 9 , wherein the synchronization activation request message is generated further based on a bridge management information container (BMIC) for a number of domain (domain #n) or a port management information container (PMIC).

11. The method of claim 9 , wherein the synchronization message is generated based on a grandmaster (GM) clock of the first communication network.

12. The method of claim 9 , wherein the UPF operates as a network-side time sensitive networking (TSN) translator (NS-TT).

13. The method of claim 9 , wherein the PDU session request message includes information related to at least one of data network name/single-network slice selection assistance information (DNN/S-NSSAI), PDU session type, capability of a user equipment (UE), or a device type of the UE.

14. A method of a network entity in a communication system, the method comprising:

receiving a packet data unit (PDU) session request message from a user equipment (UE) of a first communication network;

generating a synchronization activation request message in response to the PDU session request message; and

transmitting the synchronization activation request message to the UE and a user plane function (UPF) based on a valid time for a time synchronization service,

wherein the synchronization activation request message is generated based on a synchronization information including at least one of the valid time, a time domain for a time synchronization service, a generic public subscription identifier (GPSI), an external group ID, or a synchronization clock domain,

wherein the synchronization activation request message includes at least one of an international mobile subscriber identity (IMSI), an internal group ID, or a grandmaster (GM) clock domain,

wherein the IMSI is transformed from the GPSI,

wherein the internal group ID is transformed from the external group ID, and

wherein the GM clock domain is transformed from the synchronization clock domain.

15. The method of claim 14 , wherein the synchronization activation request message is generated further based on a bridge management information container (BMIC) for a number of domain (domain #n) or a port management information container (PMIC).

16. The method of claim 14 ,

wherein the synchronization activation request message is generated based on, a registration information and policy update information,

wherein the registration information is received from a unified data management (UDM) based on the PDU session request message, and

wherein the policy update information is received from a policy control function (PCF).

17. The method of claim 14 , wherein the network entity is a session management function (SMF) or a unified data repository (UDR).

18. The method of claim 14 , wherein the PDU session request message includes information related to at least one of data network name/single-network slice selection assistance information (DNN/S-NSSAI), PDU session type, capability of the UE, or a device type of the UE.