Method for updating policy information, network device and terminal device

1. A network device, comprising:

a processor configured to:

determine whether to update policy information of a terminal device after acquiring a Policy Section Identifier (PSI) list of the terminal device, wherein User Equipment (UE) policy is divided into different policy sections, wherein a PSI in the PSI list is used to identify a policy section, wherein the PSI comprises a Public Land Mobile Network (PLMN) identifier and a first identifier, and wherein the PLMN identifier and the first identifier are used to identify the policy section;

update the policy information of the terminal device in a condition of determining to update a policy of the terminal device; and

send at least part of the policy information to the terminal device according to the capability information of the terminal device.

2. The network device of claim 1 , wherein the processor is further configured to send policy information corresponding to a subscriber identifier of the terminal device currently used to the terminal device.

3. The network device of claim 2 , wherein the subscriber identifier comprises at least one of a Subscriber Private Identifier (SUPI) or a Subscriber Concealed Identifier (SUCI).

4. The network device of claim 1 , wherein the processor is further configured to:

update periodically the policy information of the terminal device.

5. The network device of claim 1 , wherein the processor is further configured to:

update at least part of the policy information to the terminal device according to the capability information of the terminal device.

6. The network device of claim 1 , wherein the capability information comprises at least one of the following:

a Permanent Equipment Identifier (PEI), a voice support capability of the terminal device, a Radio Frequency Selection Priority (RFSP) parameter of the terminal device, Single-Network Slice Selection Assistance Information (S-NSSAI) reported by the terminal device, whether an operating system supports at least one of receiving or identifying a Data Network Name (DNN) parameter sent by an application layer, or whether mapping an upper layer request message of 3GPP into a parameter indicating a PDU session characteristic is supported.

7. The network device of claim 1 , wherein the processor is further configured to:

acquire the capability information of the terminal device before updating the policy information of the terminal device according to the capability information of the terminal device.

8. The network device of claim 1 , wherein the network device is a Policy Control Function (PCF).

9. A method of wireless communication, comprising:

determining, by a network device, whether to update policy information of a terminal device after acquiring a Policy Section Identifier (PSI) list of the terminal device, wherein UE policy is divided into different policy sections, wherein a PSI in the PSI list is used to identify a policy section, wherein the PSI comprises a Public Land Mobile Network (PLMN) identifier and a first identifier, and wherein the PLMN identifier and the first identifier are used to identify the policy section; and

updating, by the network device, the policy information of the terminal device in a condition that the network device determines to update the policy of the terminal device, comprising:

sending, by the network device, at least part of the policy information to the terminal device according to the capability information of the terminal device.

10. The method of claim 9 , wherein determining to update the policy information of the terminal device comprises:

sending, by the network device, policy information corresponding to a subscriber identifier of the terminal device currently used to the terminal device.

11. The method of claim 10 , wherein the subscriber identifier comprises at least one of a Subscriber Private Identifier (SUPI) or a Subscriber Concealed Identifier (SUCI).

12. The method of claim 9 , wherein updating the policy information of the terminal device comprises:

updating periodically, by the network device, the policy information of the terminal device.

13. The method of claim 9 , wherein updating the policy of the terminal device further comprises:

updating, by the network device, at least part of the policy information to the terminal device according to the capability information of the terminal device.

14. The method of claim 9 , wherein the capability information comprises at least one of the following:

a Permanent Equipment Identifier (PEI), a voice support capability of the terminal device, a Radio Frequency Selection Priority (RFSP) parameter of the terminal device, Single-Network Slice Selection Assistance Information (S-NSSAI) reported by the terminal device, whether an operating system supports at least one of receiving or identifying a Data Network Name (DNN) parameter sent by an application layer, or whether mapping an upper layer request message of 3GPP into a parameter indicating a PDU session characteristic is supported.

15. The method of claim 9 , further comprising:

before the network device updates the policy information of the terminal device according to the capability information of the terminal device,

acquiring, by the network device, the capability information of the terminal device.

16. The method of claim 9 , wherein the network device is a Policy Control Function (PCF).

17. A method of wireless communication, comprising:

sending, by a terminal device, a registration request message to a network device, wherein a Policy Section Identifier (PSI) list is not carried or the PSI list is null in the registration request message, wherein UE policy is divided into different policy section, wherein a PSI in the PSI list is used to identify a policy section, wherein the PSI comprises a Public Land Mobile Network (PLMN) identifier and a first identifier, and wherein the PLMN identifier and the first identifier are used to identify the policy section; and

receiving, by the terminal device, policy information sent by the network device, wherein the terminal device does not carry the PSI list or sets the PSI list to be null in an initial registration request message initiated in a condition that a Subscriber Identification Module (SIM) card is changed.

18. A terminal device, comprising:

a transceiver, configured to send a registration request message to a network device, wherein a Policy Section Identifier (PSI) list is not carried or the PSI list is null in the registration request message, wherein UE policy is divided into different policy section, wherein a PSI in the PSI list is used to identify a policy section, wherein the PSI comprises a Public Land Mobile Network (PLMN) identifier and a first identifier, and wherein the PLMN identifier and the first identifier are used to identify the policy section;

wherein the transceiver is further configured to receive policy information sent by the network device, wherein the terminal device does not carry a PSI list or sets the PSI list to be null in an initial registration request message initiated in a condition that a Subscriber Identification Module (SIM) card is changed.