Method and system for transmission of SUSI in the NAS procedure

1. A method for a user equipment (UE), the method comprising:

initiating an initial registration procedure by sending a first registration request message to a core network node, the first registration request message including a first subscription concealed identifier (SUCI), wherein the first SUCI is based on a subscription permanent identifier (SUPI);

starting a first timer and a second timer based on sending the first registration request message;

starting a third timer based on expiry of the first timer; and

reinitiating the initial registration procedure by sending a second registration request message to the core network node based on expiry of the third timer,

wherein the second registration request message includes the first SUCI in a case where the second timer is running,

wherein the second registration request message includes a second SUCI based on the SUPI in a case where the second timer is not running, and

wherein the second SUCI is different from the first SUCI.

2. The method according to claim 1 , wherein

the sending the first Registration Request message is performed without reception of a message from the core network node.

3. The method according to claim 1 , wherein

the initiating the initial registration procedure is performed in a case where a valid 5G Globally Unique Temporary Identifier (5G-GUTI) is not available.

4. The method according to claim 1 , wherein

the first registration request message includes 5G system registration type indicating Initial Registration.

5. The method according to claim 1 , further comprising:

releasing a Non-Access Stratum (NAS) signaling connection based on expiry of the first timer.

6. The method according to claim 1 , further comprising:

starting a fourth timer in a case where the number of reinitiating the registration procedure is a certain number; and

initiating another initial registration procedure by sending a third registration request message based on expiry of the fourth timer, the third registration request message including a third SUCI based on the SUPI.

7. The method according to claim 1 , wherein

the first timer and the second timer are started simultaneously.

8. A User Equipment (UE) comprising:

a memory; and

at least one hardware processor coupled to the memory,

wherein the at least one hardware processor is configured to:

initiate an initial registration procedure by sending a first registration request message to a core network node, the first registration request message including a first subscription concealed identifier (SUCI), wherein the first SUCI is based on a subscription permanent identifier (SUPI);

start a first timer and a second timer based on sending the first registration request message;

start a third timer based on expiry of the first timer; and

reinitiate the initial registration procedure by sending a second registration request message to the core network node based on expiry of the third timer,

wherein the second registration request message includes the first SUCI in a case where the second timer is running,

wherein the second registration request message includes a second SUCI based on the SUPI in a case where the second timer is not running, and

wherein the second SUCI is different from the first SUCI.

9. The UE according to claim 8 , wherein

the at least one hardware processor is configured to send the first Registration Request message without reception of a message from the core network node.

10. The UE according to claim 8 , wherein

the at least one hardware processor is configured to initiate the initial registration procedure in a case where a valid 5G Globally Unique Temporary Identifier (5G-GUTI) is not available.

11. The UE according to claim 8 , wherein

the first registration request message includes 5G system registration type indicating Initial Registration.

12. The UE according to claim 8 , wherein

the at least one hardware processor is further configured to release a Non-Access Stratum (NAS) signaling connection based on expiry of the first timer.

13. The UE according to claim 8 , wherein

the at least one hardware processor is further configured to:

start a fourth timer in a case where the number of reinitiating the registration procedure is a certain number, and

initiate another initial registration procedure by sending a third registration request message based on expiry of the fourth timer, the third registration request message including a third SUCI based on the SUPI.

14. The UE according to claim 8 , wherein

the first timer and the second timer are started simultaneously.

15. A method for a user equipment (UE), the method comprising:

initiating a first initial registration procedure by sending a first registration request message to a core network node, the first registration request message including a first subscription concealed identifier (SUCI), wherein the first SUCI is based on a subscription permanent identifier (SUPI);

starting a first timer and a second timer based on sending the first registration request message;

starting a third timer based on expiry of the first timer; and

reinitiating a second initial registration procedure by sending a second registration request message to the core network node based on expiry of the third timer,

wherein the second registration request message includes the first SUCI in a case where the second timer is running,

wherein the second registration request message includes a second SUCI based on the SUPI in a case where the second timer is not running, and

wherein the second SUCI is different from the first SUCI.

16. The method according to claim 15 , wherein

the sending the first Registration Request message is performed without reception of a message from the core network node.

17. The method according to claim 15 , wherein

the initiating the first initial registration procedure is performed in a case where a valid 5G Globally Unique Temporary Identifier (5G-GUTI) is not available.

18. The method according to claim 15 , wherein

the first registration request message includes 5G system registration type indicating Initial Registration.

19. The method according to claim 15 , further comprising:

releasing a Non-Access Stratum (NAS) signaling connection based on expiry of the first timer.

20. The method according to claim 15 , further comprising

starting a fourth timer in a case where the number of reinitiating the registration procedure is a certain number; and

initiating a third initial registration procedure by sending a third registration request message based on expiry of the fourth timer, the third registration request message including a third SUCI based on the SUPI.

21. The method according to claim 10 , wherein the first timer and the second timer are started simultaneously.

22. A User Equipment (UE) comprising:

a memory; and

at least one hardware processor coupled to the memory;

wherein the at least one hardware processor is configured to:

initiate a first initial registration procedure by sending a first registration request message to a core network node, the first registration request message including a first subscription concealed identifier (SUCI), wherein the first SUCI is based on a subscription permanent identifier (SUPI);

start a first timer and a second timer based on sending the first registration request message;

start a third timer based on expiry of the first timer; and

reinitiate a second initial registration procedure by sending a second registration request message to the core network node based on expiry of the third timer,

wherein the second registration request message includes the first SUCI in a case where the second timer is running,

wherein the second registration request message includes a second SUCI based on the SUPI in a case where the second timer is not running, and

wherein the second SUCI is different from the first SUCI.

23. The UE according to claim 22 , wherein

the at least one hardware processor is configured to send the first Registration Request message without reception of a message from the core network node.

24. The UE according to claim 22 , wherein

the at least one hardware processor is configured to initiate the first initial registration procedure in a case where a valid 5G Globally Unique Temporary Identifier (5G-GUTI) is not available.

25. The UE according to claim 22 , wherein

the first registration request message includes 5G system registration type indicating Initial Registration.

26. The UE according to claim 22 , wherein

the at least one hardware processor is further configured to release a Non-Access Stratum (NAS) signaling connection based on expiry of the first timer.

27. The UE according to claim 22 , wherein

the at least one hardware processor is further configured to:

start a fourth timer in a case where the number of reinitiating the registration procedure is certain number, and

initiate a third initial registration procedure by sending a third registration request message based on expiry of the fourth timer, the third registration request message including a third SUCI based on the SUPI.

28. The UE according to claim 22 , wherein

the first timer and the second timer are started simultaneously.