User equipment and method for system information modification and acquisition procedure

1. A method performed by a user equipment (UE) for a system information (SI) modification and acquisition procedure, the method comprising:

receiving downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI) from a base station, the DCI including an SI modification bit and a public warning system (PWS) notification bit;

performing an SI acquisition procedure upon determining that the SI modification bit is set; and

acquiring at least one of an earthquake and tsunami warning system (ETWS) notification and a commercial mobile alert system (CMAS) notification immediately after determining that the PWS notification bit is set.

2. The method of claim 1 , wherein the SI acquisition procedure is performed in a next modification period after determining that the SI modification bit is set.

3. The method of claim 1 , further comprising stopping a bandwidth part (BWP) inactivity timer of the UE upon determining that the SI modification bit is set.

4. The method of claim 1 , wherein the DCI further includes a short message indicator that indicates whether the DCI further includes a short message and whether the DCI further includes scheduling information for paging.

5. The method of claim 4 , wherein the short message includes the SI modification bit and the PWS notification bit.

6. The method of claim 4 , further comprising:

receiving a paging message from the base station according to the scheduling information for paging, wherein the paging message includes no indication information related to an SI modification.

7. The method of claim 6 , wherein the paging message includes updated system information.

8. The method of claim 6 , wherein the paging message includes at least one of a master information block (MIB), a system information block type 1 (SIB1), an updated SIB, an updated SIB Identifier (ID), and an updated SI message ID.

9. The method of claim 4 , wherein the short message includes a field indicating in which bandwidth part (BWP) the UE reads a master information block (MIB).

10. A user equipment (UE), comprising:

a processor; and

a memory coupled to the processor, wherein the memory stores a computer-executable program that when executed by the processor, causes the UE to:

receive downlink control information (DCI) with a cyclic redundancy check (CRC) scrambled by a paging radio network temporary identifier (P-RNTI) from a base station, the DCI including an SI modification bit and a public warning system (PWS) notification bit;

perform an SI acquisition procedure upon determining that the SI modification bit is set; and

acquire at least one of an earthquake and tsunami warning system (ETWS) notification and a commercial mobile alert system (CMAS) notification immediately after determining that the PWS notification bit is set.

11. The UE of claim 10 , wherein the computer-executable program, when executed by the processor, further causes the UE to:

stop a bandwidth part (BWP) inactivity timer of the UE upon determining that the SI modification bit is set.

12. The UE of claim 10 , wherein the SI acquisition procedure is performed in a next modification period after determining that the SI modification bit is set.

13. The UE of claim 10 , wherein the DCI further includes a short message indicator that indicates whether the DCI further includes a short message and whether the DCI further includes scheduling information for paging.

14. The UE of claim 13 , wherein the short message includes a field indicating in which bandwidth part (BWP) the UE reads a master information block (MIB).

15. The UE of claim 13 , wherein the short message includes the SI modification bit and the PWS notification bit.

16. The UE of claim 13 , wherein the computer-executable program, when executed by the processor, further causes the UE to:

receive a paging message from the base station according to the scheduling information for paging, wherein the paging message includes no indication information related to an SI modification.

17. The UE of claim 16 , wherein the paging message includes updated system information.

18. The UE of claim 16 , wherein the paging message includes at least one of a master information block (MIB), a system information block type 1 (SIB1), an updated SIB, an updated SIB Identifier (ID), and an updated SI message ID.