# US 2021/0345407 A1 · Method for performing initial access procedure in unlicensed band in wireless communication system and user equipment using same

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- Number: US 2021/0345407 A1
- Document ID: US20210345407A1
- Status: Published application
- Kind: A1
- Application number: 17/267,314
- Filed: 2019-08-09
- Published: 2021-11-04
- Earliest claimed: 2018-08-09
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Sechang MYUNG; Seonwook KIM; Joonkui AHN; Suckchel YANG
- Web page: https://patentgrep.com/patent/US20210345407A1

## CPC

- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W 74/0816: with collision avoidance
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/2607: {Cyclic extensions}
- H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/0833: Random access procedures, e.g. with 4-step access
- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04W 72/1268: of uplink data flows
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present disclosure provides a method, performed by a user equipment (UE), for performing an initial access procedure in an unlicensed band, the method comprising: performing the initial access procedure with a base station; and performing transmission of a physical uplink shared channel (PUSCH) on the basis of the performing of the initial access procedure, wherein the UE obtains, from the base station, information about a listen before talk (LBT) type and information about a PUSCH starting position, and the UE performs the transmission of the PUSCH on the basis of the information about the LBT type and the information about the PUSCH starting position. The information about the PUSCH starting position is information indicating one position among a plurality of PUSCH starting position candidates. The information about the LBT type indicates one of a LBT type 1, a LBT type 2, and a LBT type 3. The UE performs random backoff-based LBT in the LBT type 1, the UE performs LBT without a random backoff in the LBT type 2, and the UE does not perform LBT in the LBT type 3.

## Claims

### Claim at position 1

1-15. (canceled)

### Claim 16

A method for performing a physical uplink shared channel (PUSCH) transmission in a wireless communication system, the method performed by a user equipment (UE) and comprising:
transmitting a random access preamble to the base station;
receiving a random access response from the base station; and
performing the PUSCH transmission,
wherein the UE receives specific information related to a start symbol of a PUSCH,
wherein the UE performs the PUSCH transmission based on the start symbol,
wherein the cyclic prefix (CP) extension is performed during a specific interval, and
wherein the specific interval is an interval determined based on a plurality of variables.

### Claim 17 (depends on 16)

The method of claim 16, wherein the specific information is start and length indicator value (SLIV) information.

### Claim 18 (depends on 17)

The method of claim 17, wherein the SLIV information informs a start symbol index of the PUSCH and a number of symbols constituting the PUSCH.

### Claim 19 (depends on 16)

The method of claim 16, wherein the plurality of variables comprises a variable which has a value of one of 25*10{circumflex over ( )}(−6), 16*10{circumflex over ( )}(−6)+T_TA or 25*10{circumflex over ( )}(−6)+T_TA,
wherein the T_TA is a timing advance between a downlink and an uplink.

### Claim 20 (depends on 19)

The method of claim 19, wherein the plurality of variables further comprises a variable which has a value related to a subcarrier spacing.

### Claim 21 (depends on 20)

The method of claim 20, wherein the UE receives information related to a listen before transmission (LBT) type.

### Claim 22 (depends on 21)

The method of claim 21, wherein the information related to the LBT type is information related to a type of a channel sensing used before the UE transmits a signal.

### Claim 23 (depends on 22)

The method of claim 22, wherein the plurality of variables are determined based on the LBT type.

### Claim 24

A user equipment (UE) comprising:
a memory;
a transceiver; and
a processor operatively coupled to the memory and the transceiver, wherein the processor is configured to:
control the transceiver to transmit a random access preamble to the base station;
control the transceiver to receive a random access response from the base station; and
perform the PUSCH transmission,
wherein the UE receives specific information related to a start symbol of a PUSCH,
wherein the UE performs the PUSCH transmission based on the start symbol,
wherein the cyclic prefix (CP) extension is performed during a specific interval, and
wherein the specific interval is an interval determined based on a plurality of variables.