Method and apparatus for receiving OSI block in wireless communication system

1. A method for receiving, by a user equipment (UE), an on-demand system information (OSI) block in a wireless communication system, the method comprising:

receiving, from a network, an OSI configuration including information on mapping between information on a system information request (SIR) preamble and an OSI block;

determining an OSI block of interest;

selecting an SIR preamble corresponding to the OSI block of interest on the basis of the OSI configuration;

requesting the determined OSI block of interest by transmitting the selected SIR preamble to a serving cell; and

receiving the requested OSI block of interest.

2. The method of claim 1 , wherein the information on the SIR preamble is a pattern of the SIR preamble.

3. The method of claim 1 , wherein the information on the SIR preamble is an identifier (ID) of the SIR preamble.

4. The method of claim 1 , wherein the information on the SIR preamble is an index of the SIR preamble.

5. The method of claim 1 , wherein the information on the SIR preamble is a resource for the SIR preamble.

6. The method of claim 1 , wherein different SIR preambles are mapped to different OSI blocks.

7. The method of claim 1 , wherein one SIR preamble is mapped to a plurality of OSI blocks.

8. The method of claim 1 , wherein when the UE is interested in receiving a particular OSI block, the particular OSI block is not broadcast by the serving cell of the UE, and the UE does not have the particular OSI block that is valid, the particular OSI block is determined as the OSI block of interest.

9. The method of claim 1 , further comprising:

requesting the OSI block of interest again by transmitting the selected SIR preamble to the serving cell when the OSI block of interest is not received within an OSI window.

10. The method of claim 1 , further comprising:

considering that obtaining system information fails when the OSI block of interest is not received within an OSI window and a number of times the SIR preamble is transmitted to the serving cell reaches a maximum number of SIR preamble transmissions.

11. The method of claim 10 , wherein the serving cell is considered by the UE as a barred cell.

12. The method of claim 1 , wherein the OSI configuration further includes at least one of a set of resources for transmitting the SIR preamble, a power-ramping factor for transmitting the SIR preamble, or a maximum transmission value for the SIR preamble.

13. The method of claim 1 , wherein the selected SIR preamble is transmitted to the serving cell only during an SIR occasion.

14. The method of claim 1 , wherein the selected SIR preamble is transmitted to the serving cell only when the OSI block of interest is not broadcast.

15. A user equipment (UE) for receiving an on-demand system information (OSI) block in a wireless communication system, the UE comprising:

a memory;

a transceiver; and

a processor to connect the memory and the transceiver,

wherein the processor is configured to:

control the transceiver to receive, from a network, an OSI configuration including information on mapping between information on a system information request (SIR) preamble and an OSI block;

determine an OSI block of interest;

select an SIR preamble corresponding to the OSI block of interest on the basis of the OSI configuration;

control the transceiver to request the determined OSI block of interest by transmitting the selected SIR preamble to a serving cell; and

control the transceiver to receive the requested OSI block of interest.