# US 12,004,235 B2 · Method whereby terminal transmits and receives signals for carrying out random access channel procedure in wireless communication system, and device therefor

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- Number: US 12,004,235 B2
- Document ID: US12004235B2
- Status: Granted
- Kind: B2
- Application number: 17/607,640
- Filed: 2020-05-04
- Published: 2022-08-04
- Granted: 2024-06-04
- Earliest claimed: 2019-05-03
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jeongsu Lee; Hyunsoo Ko; Sukhyon Yoon
- Web page: https://patentgrep.com/patent/US12004235B2

## CPC

- H04L 27/2602: {Signal structure}
- H04W 74/0841: {with collision treatment}
- H04B 7/0404: the mobile station comprising multiple antennas, e.g. to provide uplink diversity
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- H04W 72/1268: of uplink data flows
- H04W 74/004: {in the uplink, i.e. towards network}
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04W 74/0866: {using a dedicated channel for access}
- H04L 1/1854: {Scheduling and prioritising arrangements}
- H04W 74/0836: with 2-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

The present disclosure provides a method whereby a terminal transmits and receives signals for carrying out a random access channel (RACH) procedure in a wireless communication system. In particular, the method comprises: receiving first information about a transform precoder related to a physical uplink shared channel (PUSCH) transmitted via message A; on the basis of the first information, transmitting message A including the PUSCH and a physical random access channel (PRACH); and in response to message A, receiving message B including contention resolution information, wherein the first information may be used to indicate transform precoding for the PUSCH on the basis that the PUSCH is transmitted via message A.

## Claims

### Claim 1

A method for transmitting and receiving signals for performing a 2-step random access channel (RACH) procedure by a user equipment (UE) in a wireless communication system, the method comprising:
setting a RACH procedure to the 2-step RACH procedure based on a reference signal received power, RSRP, of a pathloss reference signal being above a threshold, wherein the threshold is received via a radio resource control, RRC, signalling;
receiving, from a base station, BS, both of a first parameter and a second parameter or receiving the second parameter without the first parameter,
wherein the first parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message A physical uplink shared channel, PUSCH, for 2-step RACH procedure, and
wherein the second parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message 3 PUSCH for 4-step RACH procedure;
transmitting, to the base station (BS), a message A including a preamble on a physical random access channel (PRACH) and the payload on the message A PUSCH according to an indicated transform precoding; and
receiving a message B including contention resolution information from the BS,
wherein, based on the first parameter being received, the first parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure, and
wherein, based on the first parameter not being received, the second parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the first parameter and the second parameter are based on an uplink common configuration.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the first parameter and the second parameter are received by higher layer signaling.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the transform precoding is a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) scheme or a Cyclic Prefix-OFDM (CP-OFDM).

### Claim 5

A device configured to transmit and receive signals for performing a 2-step random access channel (RACH) procedure in a wireless communication system comprising:
at least one processor; and
at least one memory operatively connected to the at least one processor, and configured to store instructions such that the at least one processor performs specific operations by executing the instructions,
wherein the specific operations include:
setting a RACH procedure to the 2-step RACH procedure based on a reference signal received power, RSRP of a pathloss reference signal being above a threshold, wherein the threshold is received via a radio resource control, RRC, signalling;
receiving, from a base station, BS, both of a first parameter and a second parameter or receiving the second parameter without the first parameter,
wherein the first parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message A physical uplink shared channel, PUSCH, for 2-step RACH procedure, and
wherein the second parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message 3 PUSCH for 4-step RACH procedure;
transmitting a message A including a preamble on a physical random access channel (PRACH) and the payload on the message A PUSCH according to an indicated transform precoding; and
receiving a message B including contention resolution information from the BS,
wherein, based on the first parameter being received, the first parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure, and
wherein, based on the first parameter not being received, a second parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure.

### Claim 6 (depends on 5)

The device according to claim 5, wherein the first parameter and the second parameter are based on an uplink common configuration.

### Claim 7 (depends on 5)

The device according to claim 5, wherein:
the first parameter and the second parameter are received by higher layer signaling.

### Claim 8 (depends on 5)

The device according to claim 5, wherein the transform precoding is a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) scheme or a Cyclic Prefix-OFDM (CP-OFDM).

### Claim 9

A user equipment (UE) configured to transmit and receive signals for performing a 2-step random access channel (RACH) procedure in a wireless communication system comprising:
at least one transceiver;
at least one processor; and
at least one memory operatively connected to the at least one processor, and configured to store instructions such that the at least one processor performs specific operations by executing the instructions,
wherein the specific operations include:
setting a RACH procedure to the 2-step RACH procedure based on a reference signal received power, RSRP of a pathloss reference signal being above a threshold, wherein the threshold is received via a radio resource control, RRC, signalling;
receiving, from a base station, BS, both of a first parameter and a second parameter or receiving the second parameter without the first parameter,
wherein the first parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message A physical uplink shared channel, PUSCH, for 2-step RACH procedure, and
wherein the second parameter is a configuration parameter used to indicate a transform precoding for a transmission of a payload on a message 3 PUSCH for 4-step RACH procedure;
transmitting, to the base station (BS), a message A including a preamble on a physical random access channel (PRACH) and the payload on the message A PUSCH according to an indicated transform precoding; and
receiving a message B including contention resolution information from the BS,
wherein, based on the first parameter being received, the first parameter a is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure, and
wherein, based on the first parameter not being received, a second parameter is used to indicate to the UE the transform precoding for the transmission of the payload on the message A PUSCH in the 2-step RACH procedure.