Random access procedure performing method in wireless communication system, and apparatus therefor

1. A method of performing a random access procedure by a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a base station, configuration information related to the random access procedure;

transmitting, to the base station, a first message including (i) a Physical Random Access Channel (PRACH) preamble and (ii) a Physical Uplink Shared Channel (PUSCH) related to random access, based on the configuration information; and

receiving, from the base station, a random access response message in response to the first message including (i) the PRACH preamble and (ii) the PUSCH related to random access,

wherein the PUSCH related to random access is associated with a Demodulation Reference Signal (DMRS) resource related to a scrambling identifier (ID),

wherein the configuration information includes (i) time domain offset information providing an offset between (i) a first resource region for the PUSCH related to random access and (ii) a second resource region for the PRACH preamble and (ii) resource information for the first resource region for the PUSCH related to random access,

wherein the first resource region for the PUSCH related to random access is determined in the time domain based on the offset from a start of a time unit including (i) the first resource region for the PUSCH related to random access and (ii) the second resource region for the PRACH preamble, and

wherein based on the offset, the PUSCH related to random access on the first resource is transmitted (i) after the PRACH preamble on the second resource region is transmitted by the UE and (ii) before the random access response message is received by the UE.

2. The method of claim 1 , further comprising:

transmitting, to the base station, a control message for the PUSCH related to random access,

wherein the control message includes at least one of i) information for the first resource region, ii) an index of the PRACH preamble, or iii) power control information.

3. The method of claim 2 ,

the control message and the PRACH preamble are mapped to same frequency region.

4. The method of claim 3 ,

wherein the PUSCH is mapped to the time region to which the control message is mapped and different frequency region.

5. The method of claim 3 ,

wherein the PUSCH is mapped to a time region including the time region to which the PRACH preamble is mapped and the time region to which the control message is mapped, and different frequency region.

6. The method of claim 1 , wherein the PUSCH is scrambled by a Temporary Mobile Subscriber Identity (TMSI) of the UE or the random value.

7. The method of claim 1 , wherein the random access response message comprises a temporary cell (C)-RNTI allocated to the UE, and downlink data related to the random access procedure comprises the C-RNTI allocated to the UE.

8. The method of claim 7 , wherein the receiving of the random access response message from the base station comprises:

descrambling the random access response message using a Random Access (RA)-Radio Network Temporary Identifier (RNTI) of the UE determined based on the PRACH preamble; and

acquiring the temporary C-RNTI from the descrambled random access response message; and

descrambling the downlink data using the temporary C-RNTI.

9. The method of claim 1 ,

wherein the first resource region is determined as a relative location from the second resource region based on the offset.

10. The method of claim 1 ,

wherein the scrambling ID is related to an index of the PRACH preamble.

11. A User Equipment (UE) in a wireless communication, the UE comprising:

a Radio Frequency (RF) unit configured to transmit and receive a radio signal; and

a processor configured to control the RF unit,

wherein the UE:

receive, from a base station, configuration information related to the random access procedure;

transmits, to the base station, a first message including (i) a Physical Random Access Channel (PRACH) preamble and (ii) a Physical Uplink Shared Channel (PUSCH) related to random access based on the configuration information, and

receives, from the base station, a random access response message in response to the first message including (i) the PRACH preamble and the (ii) PUSCH related to random access,

wherein the PUSCH related to random access is associated with a Demodulation Reference Signal (DMRS) resource related to a scrambling identifier (ID),

wherein the configuration information includes (i) time domain offset information providing an offset between (i) a first resource region for the PUSCH related to random access and (ii) a second resource region for the PRACH preamble and (ii) resource information for the first resource region for the PUSCH related to random access,

wherein the first resource region for the PUSCH related to random access is determined in the time domain based on the offset from a start time of a time unit including (i) the first resource region for the PUSCH related to random access and (ii) the second resource region for the PRACH preamble, and

wherein based on the offset, the PUSCH related to random access on the first resource is transmitted (i) after the PRACH preamble on the second resource region is transmitted by the UE and (ii) before the random access response message is received by the UE.

12. The UE of claim 11 ,

further transmits, to the base station, a control message for the PUSCH,

wherein the control message includes at least one of i) information for the first resource region, ii) an index of the PRACH preamble, or iii) power control information.