# US 2021/0242978 A1 · Method of operating ue in relation to sidelink communication and feedback in wireless communication system

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- Number: US 2021/0242978 A1
- Document ID: US20210242978A1
- Status: Published application
- Kind: A1
- Application number: 17/214,235
- Filed: 2021-03-26
- Published: 2021-08-05
- Earliest claimed: 2019-04-07
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Giwon PARK; Hanbyul SEO; Youngdae LEE; Jongyoul LEE
- Web page: https://patentgrep.com/patent/US20210242978A1

## CPC

- H04L 1/1819: {with retransmission of additional or different redundancy}
- H04L 1/1671: {the supervisory signal being transmitted together with control information}
- H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes
- H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)}
- H04L 1/1893: {Physical mapping arrangements (physical resource mapping in general H04L5/00)}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W 72/40: Resource management for direct mode communication, e.g. D2D or sidelink
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 92/18: between terminal devices
- 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)

## Abstract

Provided is a method of operating a transmitting user equipment (UE) in a wireless communication system. The method includes receiving a first radio resource control (RRC) configuration-related message by the transmitting UE (Tx UE), and transmitting a message to a receiving UE by the Tx UE. The first RRC configuration-related message includes sidelink hybrid automatic repeat request (HARQ) enable or HARQ disable configuration information.

## Claims

### Claim 1

A method of operating a transmitting user equipment (Tx UE) in a wireless communication system, the method comprising:
receiving, by the Tx UE from a base station, a radio resource control (RRC) configuration message relate to a logical channel group, wherein the RRC configuration message includes information informing that Sidelink hybrid automatic repeat request (HARQ) is enabled or disabled; and
based on the RRC configuration message, transmitting, by the Tx UE to a receiving UE (Rx UE), a message indicating that HARQ is enabled/disabled.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the message indicating that HARQ is enabled/disabled is transmitted with a data transmission.

### Claim 3 (depends on 1)

The method according to claim 1, wherein based on that HARQ is enabled, the Tx UE receives a HARQ feedback from the Rx UE.

### Claim 4 (depends on 1)

The method according to claim 1, wherein whether the HARQ is enabled or disabled is configured per the logical channel group.

### Claim 5

A transmitting user equipment (Tx UE) device comprising:
at least one processor; and
at least one computer memory operatively coupled to the at least one processor and storing instructions which, when executed, cause the at least one processor to perform operations,
wherein the operations include receiving, from a base station, a radio resource control (RRC) configuration message relate to a logical channel group, wherein the RRC configuration message includes information informing that Sidelink hybrid automatic repeat request (HARQ) is enabled or disabled; and
based on the RRC configuration message, transmitting, to a receiving UE (Rx UE), a message indicating that HARQ is enabled/disabled.

### Claim 6 (depends on 5)

The Tx UE device according to claim 5, wherein the Tx UE communicates with at least one of another UE, a UE related to autonomous driving vehicle, a BS, or a network.

### Claim 7

A processor perform operations for a transmitting user equipment (Tx UE),
wherein the operations include receiving, from a base station, a radio resource control (RRC) configuration message relate to a logical channel group, wherein the RRC configuration message includes information informing that Sidelink hybrid automatic repeat request (HARQ) is enabled or disabled; and
based on the RRC configuration message, transmitting, to a receiving UE (Rx UE), a message indicating that HARQ is enabled/disabled.

### Claim 8

A non-transitory computer-readable storage medium storing at least one computer program including instructions which, when executed by at least one processor, cause the at least one processor to perform operations for a transmitting user equipment (Tx UE),
wherein the operations include receiving, from a base station, a radio resource control (RRC) configuration message relate to a logical channel group, wherein the RRC configuration message includes information informing that Sidelink hybrid automatic repeat request (HARQ) is enabled or disabled; and
based on the RRC configuration message, transmitting, to a receiving UE (Rx UE), a message indicating that HARQ is enabled/disabled.