# US 11,452,140 B2 · Random access method, user equipment and base station

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- Number: US 11,452,140 B2
- Document ID: US11452140B2
- Status: Granted
- Kind: B2
- Application number: 16/730,520
- Filed: 2019-12-30
- Published: 2020-07-02
- Granted: 2022-09-20
- Earliest claimed: 2018-12-29
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Chen Qian; Bin Yu; Qi Xiong; Feifei Sun; Yi Wang
- Web page: https://patentgrep.com/patent/US11452140B2

## CPC

- H04W 52/146: {Uplink power control}
- H04W 74/0836: with 2-step access
- H04B 17/328: {Reference signal received power [RSRP]; Reference signal received quality [RSRQ]}
- H04W 52/325: {Power control of control or pilot channels}
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04W 52/50: at the moment of starting communication in a multiple access environment
- H04W 74/006: {in the downlink, i.e. towards the terminal}
- H04W 74/0833: Random access procedures, e.g. with 4-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)
- H04B: TRANSMISSION

## Abstract

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a random access method, including: acquiring configuration information, transmitting a first message including a preamble and an uplink shared channel according to the configuration information, and receiving a second message including contention resolution information from a base station.

## Claims

### Claim 1

A method performed by a terminal in a communication system, the method comprising:
receiving, from a base station, system information including a configuration for a message A (MsgA) of a two-step random access procedure, the MsgA including physical random access channel (PRACH) and a physical uplink shared channel (PUSCH) in the two-step random access procedure;
transmitting, to the base station, the PRACH and the PUSCH based on the configuration; and
receiving, from the base station, a response for the PRACH and the PUSCH,
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for the MsgA, in case that the configuration for the MsgA including information indicating whether to apply the transform precoding for the PUSCH of the MsgA, and
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for a message 3(Msg3) of a four-step random access, in case that the configuration for the MsgA does not include the information indicating whether to apply the transform precoding for the PUSCH of the MsgA.

### Claim 2 (depends on 1)

The method of claim 1, wherein the PUSCH is transmitted based on subcarrier spacing associated with an uplink bandwidth part configured by the system information.

### Claim 3 (depends on 2)

The method of claim 2, wherein the uplink bandwidth part is an initial uplink bandwidth part.

### Claim 4 (depends on 1)

The method of claim 1, wherein the PRACH is transmitted based on a power offset for the two-step random access procedure configured by the system information.

### Claim 5

A terminal in a communication system, the terminal comprising:
a transceiver, and
a controller configured to:
receive, from a base station, system information including a configuration for a message A (MsgA) of a two-step random access procedure, the MsgA including physical random access channel (PRACH) and a physical uplink shared channel (PUSCH) in the two-step random access procedure;
transmit, to the base station, the PRACH and the PUSCH based on the configuration; and
receive, from the base station, a response for the PRACH and the PUSCH,
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for the MsgA, in case that the configuration for the MsgA including information indicating whether to apply the transform precoding for the PUSCH of the MsgA, and
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for a message 3(Msg3) of a four-step random access, in case that the configuration for the MsgA does not include the information indicating whether to apply the transform precoding for the PUSCH of the MsgA.

### Claim 6 (depends on 5)

The terminal of claim 5, wherein the PUSCH is transmitted based on subcarrier spacing associated with an uplink bandwidth part configured by the system information.

### Claim 7 (depends on 6)

The terminal of claim 6, wherein the uplink bandwidth part is an initial uplink bandwidth part.

### Claim 8 (depends on 5)

The terminal of claim 5, wherein the PRACH is transmitted based on a power offset for the two-step random access procedure configured by the system information.

### Claim 9

A method performed by a base station in a communication system, the method comprising:
transmitting, to a terminal, system information including a configuration for a message A (MsgA) of a two-step random access procedure, the MsgA including physical random access channel (PRACH) and a physical uplink shared channel (PUSCH) in the two-step random access procedure;
receiving, from the terminal, the PRACH and the PUSCH based on the configuration; and
transmitting, to the terminal, a response for the PRACH and the PUSCH,
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for the MsgA, in case that the configuration for the MsgA including information indicating whether to apply the transform precoding for the PUSCH of the MsgA, and
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for a message 3(Msg3) of a four-step random access, in case that the configuration for the MsgA does not include the information indicating whether to apply the transform precoding for the PUSCH of the MsgA.

### Claim 10 (depends on 9)

The method of claim 9, wherein the PUSCH is received based on subcarrier spacing associated with an uplink bandwidth part configured by the system information.

### Claim 11 (depends on 10)

The method of claim 10, wherein the uplink bandwidth part is an initial uplink bandwidth part.

### Claim 12 (depends on 9)

The method of claim 9, wherein the PRACH is received based on a power offset for the two-step random access procedure configured by the system information.

### Claim 13

A base station in a communication system, the base station comprising:
transmitting, to a terminal, system information including a configuration for a message A (MsgA) of a two-step random access procedure, the MsgA including physical random access channel (PRACH) and a physical uplink shared channel (PUSCH) in the two-step random access procedure;
receiving, from the terminal, the PRACH and the PUSCH based on the configuration; and
transmitting, to the terminal, a response for the PRACH and the PUSCH,
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for the MsgA, in case that the configuration for the MsgA including information indicating whether to apply the transform precoding for the PUSCH of the MsgA, and
wherein whether to apply a transform precoding for the PUSCH of the Msg A is determined based on the configuration for a message 3(Msg3) of a four-step random access, in case that the configuration for the MsgA does not include the information indicating whether to apply the transform precoding for the PUSCH of the MsgA.

### Claim 14 (depends on 13)

The base station of claim 13, wherein the PUSCH is received based on subcarrier spacing associated with an uplink bandwidth part configured by the system information, and
wherein the uplink bandwidth part is an initial uplink bandwidth part.

### Claim 15 (depends on 13)

The base station of claim 13, wherein the PRACH is received based on a power offset for the two-step random access procedure configured by the system information.