Power saving for paging

1. A method comprising:

transmitting, by a base station, system information indicating:

a first number of paging sub-groups; and

a time offset associated with a paging early indication (PEI) occasion;

transmitting, based on the PEI occasion, a downlink control information indicating one or more paging sub-groups for a paging occasion;

wherein:

a time location of the PEI occasion is based on the time offset;

the one or more paging sub-groups comprise a first paging sub-group; and

a wireless device is associated with the first paging sub-group based on the first number and a wireless device identifier; and

transmitting paging information associated with the wireless device based on the one or more paging sub-groups comprising the first paging sub-group.

2. The method of claim 1 , wherein the transmitting the system information is via a system information block 1 (SIB1) message.

3. The method of claim 1 , wherein:

the transmitting the paging information is in response to transmitting first control information and is based on a paging occasion; and

the paging occasion is based on the wireless device identifier.

4. The method of claim 3 , wherein the first control information is associated with a paging radio network temporary identifier (RNTI).

5. The method of claim 3 , wherein:

the system information further indicates:

a second number of paging frames in a discontinuous reception (DRX) cycle; and

a third number of paging occasions for a paging frame; and

the paging occasion is further based on the second number and the third number.

6. The method of claim 5 , wherein the wireless device is associated with the first paging sub-group further based on the second number and the third number.

7. The method of claim 1 , wherein the time location of the PEI occasion is prior to a timing of the paging occasion.

8. The method of claim 1 , wherein the downlink control information comprises a field with a value indicating the first paging sub-group for the paging occasion.

9. The method of claim 1 , wherein a radio network temporary identifier (RNTI), associated with the downlink control information, is associated with paging early indication.

10. The method of claim 1 , wherein the transmitting the downlink control information is based on a search space associated with paging early indication.

11. A base station comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the base station to:

transmit system information indicating:

a first number of paging sub-groups; and

a time offset associated with a paging early indication (PEI) occasion;

transmit, based on the PEI occasion, a downlink control information indicating one or more paging sub-groups for a paging occasion;

wherein:

a time location of the PEI occasion is based on the time offset;

the one or more paging sub-groups comprise a first paging sub-group; and

a wireless device is associated with the first paging sub-group based on the first number and a wireless device identifier; and

transmit paging information associated with the wireless device based on the one or more paging sub-groups comprising the first paging sub-group.

12. The base station of claim 11 , wherein the transmitting the system information is via a system information block 1 (SIB1) message.

13. The base station of claim 11 , wherein:

transmitting the paging information is in response to transmitting first control information and is based on a paging occasion; and

the paging occasion is based on the wireless device identifier.

14. The base station of claim 13 , wherein the first control information is associated with a paging radio network temporary identifier (RNTI).

15. The base station of claim 13 , wherein:

the system information further indicates:

a second number of paging frames in a discontinuous reception (DRX) cycle; and

a third number of paging occasions for a paging frame; and

the paging occasion is further based on the second number and the third number.

16. The base station of claim 15 , wherein the wireless device is associated with the first paging sub-group further based on the second number and the third number.

17. The base station of claim 11 , wherein the time location of the PEI occasion is prior to a timing of the paging occasion.

18. The base station of claim 11 , wherein the downlink control information comprises a field with a value indicating the first paging sub-group for the paging occasion.

19. The base station of claim 11 , wherein a radio network temporary identifier (RNTI), associated with the downlink control information, is associated with paging early indication.

20. The base station of claim 11 , wherein transmitting the downlink control information is based on a search space associated with paging early indication.