Method and apparatus for random access
A method for operating a user equipment (UE) in a wireless communication includes obtaining resource configuration information of an uplink signal; obtaining resource configuration information for two-step random access based on the resource configuration information of the uplink signal; determining resources for transmission for the two-step random access based on the resource configuration information for the two-step random access; and performing the transmission for the two-step random access, wherein the transmission for the two-step random access comprises transmitting a preamble on a random access occasion (RO) and transmitting data for the two-step random access on a physical uplink shared channel (PUSCH).
1. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a base station, first information for transmission of a physical random access channel (PRACH) associated with 2 step random access (RA) and second information for transmission of a physical uplink shared channel (PUSCH) associated with the 2 step RA;
transmitting, to the base station, a PRACH preamble associated with the 2 step RA in a first slot based on the first information;
and PUSCH in a second slot based on the second information, wherein the second slot is different from the first slot;
identifying whether a response message associated with the 2 step RA is received;
as a response to the response message associated with the 2 step RA not being received, switching from the 2 step RA to a 4 step RA and
increasing a power ramping counter; and
transmitting, to the base station, a PRACH preamble associated with the 4 step RA based on the power ramping counter.
2. The method of claim 1 ,
wherein the first slot associated with the first information is determined based on a subcarrier spacing (SCS) of the PRACH preamble associated with the 2 step RA, and
wherein the second slot associated with the second information is determined based on a SCS of uplink bandwidth part (BWP) associated with the PUSCH.
3. The method of claim 1 , further comprising:
receiving, from the base station, information on a time offset associated with the first slot and the PUSCH.
4. The method of claim 1 , further comprising:
receiving, from the base station, a group B configuration of the PRACH preamble associated with the 2 step RA, wherein the group B configuration indicates that two PUSCH configurations are configured.
5. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
at least one processor configured to:
receive via the transceiver, from a base station, first information for transmission of a physical random access channel (PRACH) associated with 2 step random access (RA) and second information transmission of a physical uplink shared channel (PUSCH) associated with the 2 step RA,
transmit via the transceiver, to the base station, a PRACH preamble associated with the 2 step RA in a first slot based on the first information and PUSCH in a second slot associated with the second information, wherein the second slot is different from the first slot,
identify whether a response message associated with the 2 step RA is received,
as a response to the response message associated with the 2 step RA not being received, determine switching from the 2 step RA to a 4 step RA and
increase a power ramping counter, and
transmit via the transceiver, to the base station, a PRACH preamble associated with the 4 step RA based on the power ramping counter.
6. The terminal of claim 5 ,
wherein the first slot associated with the first information is determined based on a subcarrier spacing (SCS) of the PRACH preamble associated with the 2 step RA, and
wherein the second slot associated with the second information is determined based on a SCS of uplink bandwidth part (BWP) associated with the PUSCH.
7. The terminal of claim 5 , wherein the at least one processor is further configured to receive via the transceiver, from the base station, information on a time offset associated with the first slot and the PUSCH.
8. The terminal of claim 5 , wherein the at least one processor is further configured to receive via the transceiver, from the base station, a group B configuration of the PRACH preamble associated with the 2 step RA, wherein the group B configuration indicates that two PUSCH configurations are configured.
9. A method performed by a base station in a wireless communication system, the method comprising:
transmitting, to a terminal, first information for transmission of a physical random access channel (PRACH) associated with 2 step random access (RA) and second information for transmission of a physical uplink shared channel (PUSCH) associated with the 2 step RA;
receiving, from the terminal, a PRACH preamble associated witht the 2 step RA in a first slot based on the first information and PUSCH in a second slot, wherein the second slot is different from the first slot,
as a response to a response message of the received PRACH preamble and the PUSCH not being transmitted to the terminal, switching from the 2 step RA to a 4 step RA, wherein a power ramping counter increases; and
receiving, from the terminal, a PRACH preamble associated with the 4 step RA, wherein the PRACH preamble associated with the 4 step RA is transmitted based on the power ramping counter.
10. The method of claim 9 ,
wherein the first slot associated with the first information is determined based on a subcarrier spacing (SCS) of the PRACH preamble associated with the 2 step RA, and
wherein the second slot associated with the second information is determined based on a SCS of uplink bandwidth part (BWP) associated with the PUSCH.
11. The method of claim 9 , further comprising:
transmitting, to the terminal, information on a time offset associated with the first slot and the PUSCH.
12. The method of claim 9 , further comprising:
transmitting, to the terminal, a group B configuration of the PRACH preamble associated with the 2 step RA, wherein the group B configuration indicates that two PUSCH configurations are configured.