# US 12,010,547 B2 · Method and device for performing communication between terminals in wireless communication system

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- Number: US 12,010,547 B2
- Document ID: US12010547B2
- Status: Granted
- Kind: B2
- Application number: 17/764,752
- Filed: 2020-09-25
- Published: 2022-11-24
- Granted: 2024-06-11
- Earliest claimed: 2019-10-02
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Hyunjeong Kang; Sangkyu Baek; Seungri Jin
- Web page: https://patentgrep.com/patent/US12010547B2

## CPC

- H04W 28/0273: {adapting protocols for flow control or congestion control to wireless environment, e.g. adapting transmission control protocol [TCP] (wireless network protocols or protocol adaptations to wireless operation, e.g. wireless application protocol H04W80/00)}
- H04W 76/14: Direct-mode setup
- H04W 28/0263: {involving mapping traffic to individual bearers or channels, e.g. traffic flow template [TFT]}
- H04W 76/10: Connection setup
- H04W 76/30: Connection release
- H04W 40/22: using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
- H04W 92/18: between terminal devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided are a method and apparatus for performing communication between terminals in a wireless communication system, and an operation method of a first terminal in a wireless communication system, includes: determining to establish or release a service data adaptation protocol (SDAP) entity related to sidelink communication, based on SDAP configuration information related to the sidelink communication, wherein the SDAP entity is configured for each of a destination identifier and a cast type; and establishing or releasing the SDAP entity, based on a result of the determining.

## Claims

### Claim 1

An operation method of a sidelink transmission terminal in a wireless communication system, the operation method comprising:
determining a type of a core network (CN);
determining whether to activate a service data adaptation protocol (SDAP) layer function based on the type of the CN,
based on a result of the determination, transmitting a message indicating whether to activate a SDAP layer function to a sidelink reception terminal;
determining to establish or release a service data adaptation protocol (SDAP) entity related to sidelink communication based on SDAP configuration information, wherein the SDAP configuration information includes a cast type associated with a destination identifier, and the destination identifier relates to a destination of the sidelink communication; and
establishing or releasing the SDAP entity, based on the determination to establish or release the SDAP entity,
wherein the cast type associated with the destination identifier is one of unicast, groupcast, or broadcast.

### Claim 2 (depends on 1)

The operation method of claim 1, wherein the SDAP configuration information is received, from a base station, via a radio resource control (RRC) message related to the sidelink communication, or pre-configured in the sidelink transmission terminal.

### Claim 3 (depends on 1)

The operation method of claim 1, wherein the determining to establish or release the SDAP entity further comprises:
in case that an SDAP entity related to the destination identifier and the cast type is not present, determining to establish the SDAP entity related to the destination identifier and the cast type for the sidelink communication, based on the SDAP configuration information.

### Claim 4 (depends on 2)

The operation method of claim 2, further comprising:
receiving, from the base station via the RRC message, sidelink data radio bearer (DRB) mapping information regarding a PC5 quality of service (QoS) flow changed from sidelink DRB mapping information regarding the PC5 QoS flow, which is stored in the sidelink transmission terminal; and
transmitting, to the sidelink reception terminal, the changed sidelink DRB mapping information regarding the PC5 QoS flow.

### Claim 5 (depends on 4)

The operation method of claim 4, further comprising:
configuring an end marker related to the changed sidelink DRB mapping information regarding the PC5 QoS flow; and
transmitting the configured end marker to the sidelink reception terminal.

### Claim 6 (depends on 1)

The operation method of claim 1, wherein the determining to establish or release the SDAP entity further comprises:
in case that an SDAP entity related to the destination identifier and the cast type is not present, determining to establish the SDAP entity related to the destination identifier and the cast type for the sidelink communication, based on information included in the SDAP configuration information.

### Claim 7

A sidelink transmission terminal in a wireless communication system, the sidelink transmission terminal comprising:
a transceiver; and
at least one processor configured to:
determine a type of a core network (CN),
determine whether to activate a service data adaptation protocol (SDAP) layer function based on the type of the CN,
based on a result of the determination, transmit a message indicating whether to activate a SDAP layer function to a sidelink reception terminal,
determine to establish or release a service data adaptation protocol (SDAP) entity related to sidelink communication, based on SDAP configuration information, wherein the SDAP configuration information includes a cast type associated with a destination identifier, and the destination identifier relates to a destination of the sidelink communication, and
establish or release the SDAP entity, based on the determination to establish or release the SDAP entity,
wherein the cast type associated with the destination identifier is one of unicast, groupcast, or broadcast.