Override of default base station discontinuous reception cycle for individual user equipment

1. A method of wireless communication, comprising:

transmitting, by a user equipment when the user equipment enters a new registration area, a registration request message comprising a request for an idle discontinuous reception (I-DRX) cycle interval of a first duration;

receiving, by the user equipment, a registration accept message comprising an indication that an I-DRX cycle interval having a second duration has been assigned to the user equipment by a core network component;

receiving, by the user equipment when the user equipment enters a new serving cell, a system information block (SIB) from a base station, the SIB comprising:

a default I-DRX paging cycle;

information indicative of a maximum I-DRX cycle duration supported by the base station, the information indicative of the maximum I-DRX cycle duration supported by the base station comprising a system information modification period; and

an indication that override of the default I-DRX paging cycle is supported;

determining, by the user equipment, the maximum I-DRX cycle duration supported by the base station based on the system information modification period;

determining, by the user equipment, which of the second duration or the maximum I-DRX cycle duration supported by the base station is shorter;

setting, by the user equipment, a periodicity based on the second duration by selecting the shorter of the second duration or the maximum I-DRX cycle duration supported by the base station;

entering, by the user equipment, a Radio Resource Control Idle (RRC_IDLE) state in which a transceiver of the user equipment is in a low power state; and

causing, while the user equipment is in the RRC_IDLE state and based on the indication that override of the default I-DRX paging cycle is supported by the base station, the transceiver to periodically enter a higher power state to monitor its paging channel at the periodicity.

2. The method of claim 1 , wherein the registration request message further comprises:

the first duration as a requested I-DRX cycle interval; and

a default I-DRX override request.

3. The method of claim 1 , wherein the registration accept message further comprises:

the second duration; and

a default I-DRX override accept.

4. The method of claim 3 , wherein the first duration and the second duration are the same.

5. The method of claim 1 , wherein the core network component is an access and mobility management function node (AMF).

6. The method of claim 1 , further comprising:

receiving, by the user equipment, a second system information block (SIB) from a second base station, the second SIB comprising:

a default I-DRX paging cycle associated with the second base station; and

an indication that override of the default I-DRX paging cycle associated with the second base station is not supported; and

causing, while the user equipment is in the RRC_IDLE state and based on the indication that override of the default I-DRX paging cycle is not supported by the base station, the transceiver to periodically enter the higher power state to monitor its paging channel at a periodicity based on the default I-DRX paging cycle.

7. The method of claim 6 ,

wherein the indication that override of the default I-DRX paging cycle associated with the second base station is not supported comprises one or more of:

a default I-DRX override value of false; a maximum I-DRX cycle duration value of zero; omission of a default I-DRX override value from the second SIB; or omission of a maximum I-DRX cycle duration value from the second SIB.

8. The method of claim 1 ,

wherein the indication that override of the default I-DRX paging cycle is supported comprises one or more of:

a default I-DRX override value of true; or a non-zero maximum I-DRX cycle duration value.

9. A wireless communication device, comprising:

a transceiver;

memory; and

a processor communicatively coupled to the transceiver and the memory, the processor configured to:

when the wireless communication device enters a new registration area, transmit a registration request message comprising a request for an idle discontinuous reception (I-DRX) cycle interval of a first duration;

receive a registration accept message comprising an indication that an I-DRX cycle interval having a second duration has been assigned to the wireless communication device by a core network component;

when the wireless communication device enters a new serving cell, receive a system information block (SIB) from a base station, the SIB comprising:

a default I-DRX paging cycle;

information indicative of a maximum I-DRX cycle duration supported by the base station, the information indicative of the maximum I-DRX cycle duration supported by the base station comprising a system information modification period; and

an indication that override of the default I-DRX paging cycle is supported;

determine the maximum I-DRX cycle duration supported by the base station based on the system information modification period;

determine which of the second duration or the maximum I-DRX cycle duration supported by the base station is shorter;

set a periodicity based on the second duration by selecting the shorter of the second duration or the maximum I-DRX cycle duration supported by the base station;

enter a Radio Resource Control Idle (RRC_IDLE) state in which the transceiver is in a low power state; and

cause, while the wireless communication device is in the RRC_IDLE state and based on the indication that override of the default I-DRX paging cycle is supported by the base station, the transceiver to periodically enter a higher power state to monitor its paging channel at the periodicity.

10. The wireless communication device of claim 9 , wherein registration request message further comprises:

the first duration as a requested I-DRX cycle interval; and

a default I-DRX override request.

11. The wireless communication device of claim 9 , wherein the registration accept message further comprises: the second duration; and

a default I-DRX override accept.

12. The wireless communication device of claim 11 , wherein the first duration and the second duration are the same.

13. The wireless communication device of claim 9 , wherein the core network component is an access and mobility management function node (AMF).

14. The wireless communication device of claim 9 , wherein the processor is further configured to:

receive a second system information block (SIB) from a second base station, the second SIB comprising:

a default I-DRX paging cycle associated with the second base station; and

an indication that override of the default I-DRX paging cycle associated with the second base station is not supported; and

cause, while the wireless communication device is in the RRC_IDLE state and based on the indication that override of the default I-DRX paging cycle is not supported by the base station, the transceiver to periodically enter the higher power state to monitor its paging channel at a periodicity based on the default I-DRX paging cycle.

15. The wireless communication device of claim 14 ,

wherein the indication that override of the default I-DRX paging cycle associated with the second base station is not supported comprises one or more of:

a default I-DRX override value of false; a maximum I-DRX cycle duration value of zero; omission of a default I-DRX override value from the second SIB; or omission of a maximum I-DRX cycle duration value from the second SIB.

16. The wireless communication device of claim 9 ,

wherein the indication that override of the default I-DRX paging cycle is supported comprises one or more of:

a default I-DRX override value of true; or a non-zero maximum I-DRX cycle duration value.