# US 12,016,057 B2 · Method and device for performing random access procedure in wireless communication system

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- Number: US 12,016,057 B2
- Document ID: US12016057B2
- Status: Granted
- Kind: B2
- Application number: 17/426,378
- Filed: 2020-01-31
- Published: 2022-06-09
- Granted: 2024-06-18
- Earliest claimed: 2019-02-01
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jeongsu Lee; Hyunsoo Ko; Kijun Kim; Sukhyon Yoon; Suckchel Yang
- Web page: https://patentgrep.com/patent/US12016057B2

## CPC

- H04W 52/146: {Uplink power control}
- H04W 74/0841: {with collision treatment}
- H04W 52/16: Deriving transmission power values from another channel
- H04W 52/247: {where the output power of a terminal is based on a path parameter sent by another terminal}
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04W 72/0473: {the resource being transmission power}
- H04W 74/002: {Transmission of channel access control information}
- 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}
- H04W 52/40: during macro-diversity or soft handoff
- H04W 74/0836: with 2-step access
- H04W 74/0838: using contention-free random access [CFRA]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method of performing, by a user equipment (UE), a random access procedure in a wireless communication system is disclosed. The method includes receiving configuration information related to the random access procedure, transmitting a random access preamble and a physical uplink shared channel (PUSCH), and receiving a random access response (RAR) message. The PUSCH is transmitted based on a predetermined PUSCH transmission power. The predetermined PUSCH transmission power is based on preamble reception power information related to a transmission of the random access preamble and a specific offset.

## Claims

### Claim 1

A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving i) a Preamble Received Target Power for a preamble related to a 4-step Random Access (RA) type and ii) a msg3 Delta Preamble for a transmission of a Msg3 Physical Uplink Shared CHannel (PUSCH) related to the 4-step RA type;
receiving i) a msgA Preamble Received Target Power for a MsgA preamble related to a 2-step RA type and ii) a msgA Delta Preamble for a transmission of a MsgA PUSCH related to the 2-step RA type;
based on a random access procedure related to the 2-step RA type being initiated, transmitting the MsgA preamble and the MsgA PUSCH; and
receiving a random access response (RAR) message,
wherein the MsgA preamble is transmitted based on the msgA Preamble Received Target Power,
wherein the MsgA PUSCH is transmitted based on a PUSCH transmission power, and
wherein the PUSCH transmission power is determined based on i) a number of resource blocks for the transmission of the MsgA PUSCH, ii) the msgA Preamble Received Target Power, iii) the msgA Delta Preamble which is a power offset relative to the msgA Preamble Received Target Power, iv) a power control value related to a path loss (PL), and v) a power control value related to a transport format (TF).

### Claim 2 (depends on 1)

The method of claim 1, wherein the PUSCH transmission power is determined as a smaller value of:
i) a pre-configured UE transmission power; and
ii) a value calculated based on i) the number of resource blocks for the transmission of the MsgA PUSCH, ii) the msgA Preamble Received Target Power, iii) the msgA Delta Preamble, iv) the power control value related to the PL, and v) the power control value related to the TF.

### Claim 3

A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:
one or more transceivers;
one or more processors; and
one or more memories operationally connected to the one or more processors and storing instructions that, based on being executed by the one or more processors, perform operations comprising:
receiving i) a Preamble Received Target Power for a preamble related to a 4-step Random Access (RA) type and ii) a msg3 Delta Preamble for a transmission of a Msg3 Physical Uplink Shared CHannel (PUSCH) related to the 4-step RA type;
receiving i) a msgA Preamble Received Target Power for a MsgA preamble related to a 2-step RA type and ii) a msgA Delta Preamble for a transmission of a MsgA PUSCH related to the 2-step RA type;
based on a random access procedure related to the 2-step RA type being initiated, transmitting the MsgA preamble and the MsgA PUSCH; and
receiving a random access response (RAR) message,
wherein the MsgA preamble is transmitted based on the msgA Preamble Received Target Power,
wherein the MsgA PUSCH is transmitted based on a PUSCH transmission power, and
wherein the PUSCH transmission power is determined based on i) a number of resource blocks for the transmission of the MsgA PUSCH, ii) the msgA Preamble Received Target Power, iii) the msgA Delta Preamble which is a power offset relative to the msgA Preamble Received Target Power, iv) a power control value related to a path loss (PL), and v) a power control value related to a transport format (TF).

### Claim 4

A method performed by a base station in a wireless communication system, the method comprising:
transmitting i) a Preamble Received Target Power for a preamble related to a 4-step Random Access (RA) type and ii) a msg3 Delta Preamble for a transmission of a Msg3 Physical Uplink Shared CHannel (PUSCH) related to the 4-step RA type;
transmitting i) a msgA Preamble Received Target Power for a MsgA preamble related to a 2-step RA type and ii) a msgA Delta Preamble for a transmission of a MsgA PUSCH related to the 2-step RA type;
based on a random access procedure related to the 2-step RA type being initiated, receiving the MsgA preamble and the MsgA PUSCH; and
transmitting a random access response (RAR) message,
wherein the MsgA preamble is transmitted, by a user equipment (UE), based on the msgA Preamble Received Target Power,
wherein the MsgA PUSCH is transmitted, by the UE, based on a PUSCH transmission power, and
wherein the PUSCH transmission power is determined based on i) a number of resource blocks for the transmission of the MsgA PUSCH, ii) the msgA Preamble Received Target Power, iii) the msgA Delta Preamble which is a power offset relative to the msgA Preamble Received Target Power, iv) a power control value related to a path loss (PL), and v) a power control value related to a transport format (TF).