Method and apparatus for receiving system information

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

receiving a system information block type 1 (SIB1) from a cell;

transmitting, to the cell, a first message including a common control channel (CCCH) service data unit (SDU), the CCCH SDU including a radio resource control (RRC) SI request message;

receiving, from the cell, a medium access control (MAC) control element (CE) including a UE contention resolution identity; and

indicating, by a MAC entity of the UE, reception of an acknowledgment for the RRC SI request message to an RRC entity of the UE after determining that the UE contention resolution identity matches a portion of the CCCH SDU,

wherein the SIB1 does not include information related to a Random Access (RA) resource specific to SI requested by the RRC SI request message.

2. The method of claim 1 , wherein the SIB1 includes a first list, a number of entries in the first list ranging from one to a number of public land mobile networks (PLMNs) operating the cell, and each entry in the first list includes:

an indicator corresponding to a PLMN operating the cell; and

access control information of the PLMN operating the cell.

3. The method of claim 2 , wherein the SIB1 further includes a second list, a number of entries in the second list ranging from one to the number of PLMNs operating the cell, and each entry in the second list includes:

a PLMN identity;

a cell identity; and

a tracking area code.

4. The method of claim 2 , wherein the SIB1 further includes cell-specific scheduling information.

5. The method of claim 2 , wherein the SIB1 further includes scheduling information indicating whether an SI message is broadcast.

6. The method of claim 5 , wherein the scheduling information further indicates PLMN information corresponding to the SI message.

7. The method of claim 1 , wherein the RRC SI request message is received by the MAC entity of the UE via a CCCH, which is configured with a transparent mode radio link control (RLC) entity.

8. The method of claim 1 , further comprising starting a timer after receiving the MAC CE,

wherein the RRC SI request message includes information related to the timer.

9. The method of claim 1 , wherein the MAC CE further includes at least one of the following:

a broadcast delay time;

a broadcast monitoring duration;

an uplink (UL) grant; and

a downlink (DL) grant.

10. The method of claim 1 , further comprising transmitting a second message to complete an RRC connection setup procedure, wherein the second message includes at least one of the following:

a UE Identifier (ID);

an inactive radio network temporary identifier (I-RNTI);

public land mobile networks (PLMN) information;

a registered Mobility Management Entity (MME) or Access and Mobility Management Function (AMF);

dedicated non-access stratum (NAS) information; and

a System Architecture Evolution (SAE)-Temporary Mobile Subscriber Identity (S-TMSI).

11. A user equipment (UE) for performing a method for a system information (SI) request procedure, comprising:

one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; and

at least one processor coupled to the one or more non-transitory computer-readable media, and configured to execute the computer-executable instructions to:

receive a system information block type 1 (SIB1) from a cell;

transmit, to the cell, a first message including a common control channel (CCCH) service data unit (SDU), the CCCH SDU including a radio resource control (RRC) SI request message;

receive, from the cell, a medium access control (MAC) control element (CE) including a UE contention resolution identity; and

indicate, by a MAC entity of the UE, reception of an acknowledgment for the RRC SI request message to an RRC entity of the UE after determining that the UE contention resolution identity matches a portion of the CCCH SDU,

wherein the SIB1 does not include information related to a Random Access (RA) resource specific to SI requested by the RRC SI request message.

12. The UE of claim 11 , wherein the SIB1 includes a first list, a number of entries in the first list ranging from one to a number of public land mobile networks (PLMNs) operating the cell, and each entry in the first list includes:

an indicator corresponding to a PLMN operating the cell; and

access control information of the PLMN operating the cell.

13. The UE of claim 12 , wherein the SIB1 further includes a second list, a number of entries in the second list ranging from one to the number of PLMNs operating the cell, and each entry in the second list includes:

a PLMN identity;

a cell identity; and

a tracking area code.

14. The UE of claim 12 , wherein the SIB1 further includes cell-specific scheduling information.

15. The UE of claim 12 , wherein the SIB1 further includes scheduling information indicating whether an SI message is broadcast.

16. The UE of claim 15 , wherein the scheduling information further indicates PLMN information corresponding to the SI message.

17. The UE of claim 11 , wherein the RRC SI request message is received by the MAC entity of the UE via a CCCH, which is configured with a transparent mode radio link control (RLC) entity.

18. The UE of claim 11 , the at least one processor is further configured to execute the computer-executable instructions to start a timer after receiving the MAC CE,

wherein the RRC SI request message includes information related to the timer.

19. The UE of claim 11 , wherein the MAC CE further includes at least one of the following:

a broadcast delay time;

a broadcast monitoring duration;

an uplink (UL) grant; and

a downlink (DL) grant.

20. The UE of claim 11 , the at least one processor is further configured to execute the computer-executable instructions to transmit a second message to complete an RRC connection setup procedure, wherein the second message comprises at least one of the following:

a UE Identifier (ID);

an inactive radio network temporary identifier (I-RNTI);

public land mobile networks (PLMN) information;

a registered Mobility Management Entity (MME) or Access and Mobility Management Function (AMF);

dedicated non-access stratum (NAS) information; and

a System Architecture Evolution (SAE)-Temporary Mobile Subscriber Identity (S-TMSI).