Random access performing method, and device supporting same

1. A method for performing a random access procedure in a wireless communication system, the method comprising:

selecting a first beam group including a set number of M beams;

transmitting a random access preamble to a base station via the first beam group;

adjusting the first beam group to a second beam group based on a determination that the random access procedure failed, wherein failure of the random access procedure is related to M access attempts based on the set number of M beams;

reselecting the second beam group including a set number of N beams; and

transmitting the random access preamble to the base station via the second beam group, wherein M is different from N.

2. The method of claim 1 , wherein the random access procedure is determined to have failed based on any one of a response to the random access preamble has not been received after the random access preamble has been transmitted a set number of times or it is determined that a contention resolution has not been performed successfully.

3. The method of claim 1 , wherein a threshold value is a value related to Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).

4. The method of claim 1 , wherein transmitting the random access preamble comprises:

transmitting the random access preamble on each of the M beams included in the first beam group at least once.

5. The method of claim 1 , further comprising:

receiving first configuration information related to a plurality of values of M from the base station, and

receiving second configuration information related to a plurality of values of N from the base station.

6. The method of claim 1 , wherein the base station is a base station of a target cell for which handover is to be performed.

7. The method of claim 1 , wherein the method is performed by a terminal, and wherein the terminal communicates with at least one of a mobile terminal, a network or autonomous vehicles other than the terminal.

8. A terminal configured to perform a random access procedure in a wireless communication system, the terminal comprising:

a memory;

a transceiver; and

a processor operationally connecting the memory and the transceiver to each other,

wherein the processor is configured to:

select a first beam group including a set number of M beams;

transmit a random access preamble to a base station via the first beam group;

adjust the first beam group to a second beam group based on a determination that the random access procedure failed, wherein failure of the random access procedure is related to M access attempts based on the set number of M beams;

reselect the second beam group including a set number of M beams; and

transmit the random access preamble to the base station via the second beam group, wherein M is different from N.

9. The terminal of claim 8 , wherein the random access procedure is determined to have failed based on any one of a response to the random access preamble has not been received after the random access preamble has been transmitted a set number of times or it is determined that a contention resolution has not been performed successfully.

10. The terminal of claim 8 , wherein a threshold value is a value related to Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ).

11. The terminal of claim 6 , wherein the processor is further configured to transmit the random access preamble on each of the M beams included in the first beam group at least once.

12. The terminal of claim 8 , the processor is further configured to receive first configuration information related to a plurality of values of M from the base station, and receive second configuration information related to a plurality of values of N from the base station.