Method for processing system information for machine-type communication system and a device therefor

1. A method performed by a user equipment (UE) operating in a wireless communication system, the method comprising:

receiving, in a first period, repetitions of system information for scheduling other System Information Blocks (SIBs);

receiving, at a specific time in the first period, information for informing that the system information for scheduling the other SIBs is not changed in a second period following the first period;

receiving a Master Information Block (MIB) including information regarding a maximum number of repetitions of the system information;

determining whether the system information for scheduling the other SIBs is successfully decoded by an end time of the first period; and

based on the system information for scheduling the other SIBs not being successfully decoded:

accumulating the repetitions of the system information, including repetitions of the system information accumulated in the second period, from the specific time in the first period until the maximum number of repetitions is reached;

decoding the system information for scheduling the other SIBs, based on the repetitions of the system information accumulated from the specific time in the first period to an end time of the second period;

based on the system information being successfully decoded before the maximum number of repetitions is reached: terminating the accumulation of the repetitions of the system information; and

based on the system information not being successfully decoded by a time the maximum number of repetitions is reached: (i) discarding the repetitions of the system information that were accumulated until the maximum number of repetitions is reached;

and (ii) starting to newly accumulate the repetitions of the system information in the second period.

2. The method according to claim 1 , wherein receiving the information for informing that that the system information for scheduling the other SIBs is not changed in the second period comprises:

receiving one of Earthquake and Tsunami Warning System (ETWS) indication, Commercial Mobile Alert Service (CMAS) indication, or Extended Access Barring (EAB) indication via a paging message.

3. The method according to claim 1 , wherein the system information for scheduling other SIBs is one of SystemInformationBlockType1, SystemInformationBlockType1-BR, or SystemInformationBlockType1-NB.

4. The method according to claim 1 , wherein, based on the system information for scheduling other SIBs being successfully decoded at the end time of the first period, the UE stops accumulating the repetitions of the system information in the first period and receives system information corresponding to the scheduling information for scheduling the other SIBs.

5. The method according to claim 1 , further comprising:

receiving, at the specific time in the first period, information for informing that the system information for scheduling other SIBs is changed in the second period;

discarding the repetitions of the system information that were accumulated in the first period, and starting to accumulate the repetitions of the system information in the second period, based on the system information for scheduling the other SIBs not being successfully decoded at the end time of the first period; and

receiving system information corresponding to the scheduling information for scheduling the other SIBs based on the system information for scheduling other SIBs being successfully decoded at the end time of the first period.

6. The method according to claim 1 , wherein the UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station and/or a network.

7. A User Equipment (UE) configured to operate in a wireless communication system, the UE comprising:

a Radio Frequency (RF) module; and

a processor operably coupled with the RF module and configured to:

receive, in a first period, repetitions of system information for scheduling other System Information Blocks (SIBs);

receive, at a specific time in the first period, information for informing that the system information for scheduling the other SIBs is not changed in a second period following the first period; and

receive a Master Information Block (MIB) including information regarding a maximum number of repetitions of the system information;

determine whether the system information for scheduling the other SIBs is successfully decoded by an end time of the first period; and

based on the system information for scheduling the other SIBs not being successfully decoded:

accumulate the repetitions of the system information, including repetitions of the system information accumulated in the second period, from the specific time in the first period until the maximum number of repetition is reached; and

decode the system information for scheduling the other SIBs based on the repetitions of the system information accumulated from the specific time in the first period to an end time of the second period,

based on the system information being successfully decoded before the maximum number of repetitions is reached: terminate the accumulation of the repetitions of the system information; and

based on the system information being not successfully decoded by a time the maximum number of repetitions is reached: (i) discarding the repetitions of the system information that were accumulated until the maximum number of repetitions is reached;

and (ii) starting to newly accumulate the repetitions of the system information in the second period.

8. The UE according to claim 7 , wherein receiving the information for informing that that the system information for scheduling the other SIBs is not changed in the second period comprises:

receiving one of ETWS indication, CMAS indication, or EAB indication via a paging message.

9. The UE according to claim 7 , wherein the system information for scheduling other SIBs is one of SystemInformationBlockType1, SystemInformationBlockType1-BR, or SystemInformationBlockType1-NB.

10. The UE according to claim 7 , wherein based on the system information for scheduling other SIBs being successfully decoded at the end time of the first period, the UE stops accumulating the repetitions of the system information in the first period and receives system information corresponding to the scheduling information for scheduling the other SIBs.

11. The UE according to claim 7 , wherein the processor is further configured to:

receive, at the specific time in the first period, information for informing that the system information for scheduling other SIBs is changed in the second period,

discard the repetitions of the system information that were accumulated in the first period and start to accumulate the repetitions of the system information in the second period, based on the system information for scheduling the other SIBs not being successfully decoded at the time of end time of the first period, and

receive system information corresponding to the scheduling information for scheduling the other SIBs based on the system information for scheduling other SIBs being successfully decoded at the end time of the first period.

12. The UE according to claim 7 , wherein the UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station and/or a network.