Method for requesting system information block and device supporting same

1. A method for requesting, by a terminal, a system information block in a wireless communication system, the method comprising:

transmitting, to a base station, a first random access preamble corresponding to a system information block of interest;

receiving, from the base station, a random access response including a random access preamble identifier, wherein the random access preamble identifier indicates a second random access preamble which is different from the first random access preamble; and

determining that the random access response is valid for the terminal based on the second random access preamble being included in the same preamble group as the first random access preamble.

2. The method of claim 1 , further comprising:

before receiving the random access response,

receiving, from the base station, a mapping relationship among the system information block of interest, the preamble group, the first random access preamble, and the second random access preamble.

3. The method of claim 1 , further comprising:

terminating the random access procedure based on it being determined that the random access response is valid for the terminal.

4. The method of claim 1 , further comprising:

receiving, from the base station, the system information block of interest based on it being determined that the random access response is valid for the terminal.

5. The method of claim 1 , wherein the random access response is generated by the base station as the second random access preamble is received from another terminal.

6. The method of claim 1 , wherein the preamble group matches the system information block of interest one to one.

7. The method of claim 1 , wherein the system information block is an on-demand system information block.

8. A terminal requesting a system information block in a wireless communication system, the terminal comprising:

a memory,

a transceiver; and

a processor operably connecting the memory and the transceiver,

wherein the processor is configured to

transmit, to a base station, a first random access preamble corresponding to a system information block of interest,

receive, from the base station, a random access response including a random access preamble identifier, wherein the random access preamble identifier indicates a second random access preamble which is different from the first random access preamble, and

determine that the random access response is valid for the terminal based on the second random access preamble being included in the same preamble group as the first random access preamble.

9. The terminal of claim 8 , wherein before receiving the random access response, the processor is configured to receive, from the base station, a mapping relationship among the system information block of interest, the preamble group, the first random access preamble, and the second random access preamble.

10. The terminal of claim 8 , wherein the processor terminates the random access procedure based on it being determined that the random access response is valid for the terminal.

11. The terminal of claim 8 , wherein the processor receives, from the base station, the system information block of interest based on it being determined that the random access response is valid for the terminal.

12. The terminal of claim 8 , wherein the random access response is generated by the base station as the second random access preamble is received from another terminal.

13. The terminal of claim 8 , wherein the preamble group matches the system information block of interest one to one.

14. The terminal of claim 8 , wherein the system information block is an on-demand system information block.