Method and apparatus of transmitting random access preamble for coverage enhancement performing by user equipment in wireless communication system

1 . A method performed by a user equipment (UE), the method comprising:

receiving information related to random access resources for multiple synchronization signal blocks (SSBs) from a network, wherein the multiple SSBs comprise;

i) first SSBs for which random access resources for Msg3 physical uplink shared channel (PUSCH) repetition are provided, and

ii) second SSBs for which random access resources for Msg3 PUSCH repetition are not provided;

performing reference signal received power (RSRP) measurements for the multiple SSBs;

based on at least one SSB with RSRP greater than a first threshold being available among the multiple SSBs, selecting one SSB among the at least one SSB with RSRP greater than the first threshold;

based on RSRPs of all the multiple SSBs being less than a second threshold, selecting one SSB among the first SSBs;

based on RSRP of at least one of the multiple SSBs being less than the first threshold and equal to or greater than the second threshold, selecting any SSB among the second SSBs; and

transmitting a random access preamble based on a random access resource related to the selected SSB.

2 . The method of claim 1 , further comprising:

receiving, from the network, a random access response that includes an uplink grant,

wherein, based on the random access resource related to the selected SSB being for Msg3 PUSCH repetition, the uplink grant in the random access response includes information related to a number of repetitions.

3 . The method of claim 1 ,

wherein the first threshold is greater than the second threshold.

4 . A user equipment (UE) comprising:

at least one transceiver;

at least one processor; and

at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising:

receiving information related to random access resources for multiple synchronization signal blocks (SSBs) from a network, wherein the multiple SSBs comprise;

i) first SSBs for which random access resources for Msg3 physical uplink shared channel (PUSCH) repetition are provided, and

ii) second SSBs for which random access resources for Msg3 PUSCH repetition are not provided;

performing reference signal received power (RSRP) measurements for the multiple SSBs;

based on at least one SSB with RSRP greater than a first threshold being available among the multiple SSBs, selecting one SSB among the at least one SSB with RSRP greater than the first threshold;

based on RSRPs of all the multiple SSBs being less than a second threshold, selecting one SSB among the first SSBs;

based on RSRP of at least one of the multiple SSBs being less than the first threshold and equal to or greater than the second threshold, selecting any SSB among the second SSBs; and

transmitting a random access preamble based on a random access resource related to the selected SSB.

5 . The UE of claim 4 , wherein the operations further comprise:

receiving, from the network, a random access response that includes an uplink grant,

wherein, based on the random access resource related to the selected SSB being for Msg3 PUSCH repetition, the uplink grant in the random access response includes information related to a number of repetitions.

6 . The UE of claim 4 ,

wherein the first threshold is greater than the second threshold.

7 . A computer readable non-transitory storage medium storing at least one computer program comprising instructions that, when executed by at least one processor, cause the at least one processor to perform operations for a user equipment (UE), the operations comprising:

receiving information related to random access resources for multiple synchronization signal blocks (SSBs) from a network, wherein the multiple SSBs comprise;

i) first SSBs for which random access resources for Msg3 physical uplink shared channel (PUSCH) repetition are provided, and

ii) second SSBs for which random access resources for Msg3 PUSCH repetition are not provided;

performing reference signal received power (RSRP) measurements for the multiple SSBs;

based on at least one SSB with RSRP greater than a first threshold being available among the multiple SSBs, selecting one SSB among the at least one SSB with RSRP greater than the first threshold;

based on RSRPs of all the multiple SSBs being less than a second threshold, selecting one SSB among the first SSBs;

based on RSRP of at least one of the multiple SSBs being less than the first threshold and equal to or greater than the second threshold, selecting any SSB among the second SSBs; and

transmitting a random access preamble based on a random access resource related to the selected SSB.

8 . The computer readable non-transitory storage medium of claim 7 , wherein the operations further comprise:

receiving, from the network, a random access response that includes an uplink grant,

wherein, based on the random access resource related to the selected SSB being for Msg3 PUSCH repetition, the uplink grant in the random access response includes information related to a number of repetitions.

9 . The computer readable non-transitory storage medium of claim 7 , wherein the first threshold is greater than the second threshold.