# US 11,445,542 B2 · Method and apparatus for transmitting or receiving data in unlicensed band

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- Number: US 11,445,542 B2
- Document ID: US11445542B2
- Status: Granted
- Kind: B2
- Application number: 17/051,611
- Filed: 2019-08-09
- Published: 2021-07-29
- Granted: 2022-09-13
- Earliest claimed: 2018-08-10
- Assignees: Kt Corporation
- Applicants: Kt Corporation
- Inventors: Kyujin Park
- Web page: https://patentgrep.com/patent/US11445542B2

## CPC

- H04W 74/004: {in the uplink, i.e. towards network}
- H04L 1/0068: {by puncturing}
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/0816: with collision avoidance
- H04W 16/14: Spectrum sharing arrangements {between different networks}
- H04W 72/1268: of uplink data flows
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- 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

Provided are a method and apparatus for transmitting or receiving data in an unlicensed band. The method may include: receiving configuration information of one or more subbands relating to a cell system bandwidth included in an unlicensed band or a bandwidth part included in an unlicensed band; receiving downlink control information including uplink frequency domain resource allocation information for uplink data transmission in the bandwidth part or the system bandwidth; on the basis of the resource allocation information, performing an LBT operation on each of subbands including frequency resources allocated for the uplink data transmission; and on the basis of the result of the LBT operation, determining a subband for transmitting uplink data; and transmitting the uplink data in the determined subband.

## Claims

### Claim 1

A method for an uplink data transmission using an unlicensed band by a user equipment (UE), the method comprising:
configuring multiple subbands of a bandwidth part for the unlicensed band;
receiving downlink control information including frequency domain resource allocation information for transmitting uplink data;
performing an listen before talk (LBT) operation on each of the multiple subbands based on the downlink control information;
determining whether the LBT operation is succeed on all of the multiple subbands; and
performing a transmission of the uplink data based on the determination that the LBT operation is succeed on all of the multiple subbands.

### Claim 2

A user equipment (UE) for an uplink data transmission using an unlicensed band, the UE comprising:
a receiver configured to receive downlink control information including frequency domain resource allocation information for transmitting uplink data;
a controller configured to configure multiple subbands of a bandwidth part for the unlicensed band, perform an listen before talk (LBT) operation on each of the multiple subbands based on the downlink control information, and determine whether the LBT operation is succeed on all of the multiple subbands; and
a transmitter configured to perform a transmission of the uplink data based on the determination that the LBT operation is succeed on all of the multiple subbands.

### Claim 3 (depends on 1)

The method of claim 1, wherein the downlink control information is received via a physical downlink control channel (PDCCH).

### Claim 4 (depends on 2)

The UE of claim 2, wherein the downlink control information is received via a physical downlink control channel (PDCCH).

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
receiving configuration information for configuring the multiple subbands.

### Claim 6 (depends on 2)

The UE of claim 2, wherein the receiver further configured to receive configuration information for configuring the multiple subbands.