# US 11,115,837 B2 · Method and device for transmitting data unit, and method and device for receiving data unit

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- Number: US 11,115,837 B2
- Document ID: US11115837B2
- Status: Granted
- Kind: B2
- Application number: 16/082,520
- Filed: 2017-03-21
- Published: 2019-03-28
- Granted: 2021-09-07
- Earliest claimed: 2016-03-25
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Seungjune Yi; Sunyoung Lee
- Web page: https://patentgrep.com/patent/US11115837B2

## CPC

- H04W 24/02: Arrangements for optimising operational condition
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04W 84/047: {using dedicated repeater stations}
- H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals
- H04W 92/10: between terminal device and access point, i.e. wireless air interface
- Y02D 30/70: in wireless communication networks
- 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)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A radio link control (RLC) entity can be used for multiple radio bearers (RBs). In other words, one RLC entity can be associated with multiple packet data convergence protocol (PDCP) entities, where the multiple PDCP entities are associated with the multiple RBs, respectively. An identifier of a PDCP or RB can be provided with a PDCP PDU in order to inform the RLC entity or a receiving device which RB or which PDCP entity the PDCP PDU is associated with. The RLC entity shared by more than one RB can be configured according to configuration information for RB(s).

## Claims

### Claim 1

A method for transmitting, by a user equipment (UE), a data unit in a wireless communication system, the method comprising:
receiving first configuration information for a first radio bearer (RB) and second configuration information for a second RB from a network device,
wherein a first packet data convergence protocol (PDCP) entity is configured for the first RB based on the first configuration information, and a second PDCP entity is configured for the second RB based on the second configuration information,
wherein the first configuration information and the second configuration information include an identifier of a shared radio link control (RLC) entity,
wherein both the first PDCP entity and the second PDCP entity are associated with the shared RLC entity, and
wherein the shared RLC entity is associated with a medium access control (MAC) entity;
receiving, at the shared RLC entity, a PDCP protocol data unit (PDU) from one of the first PDCP entity or the second PDCP entity;
generating, at the shared RLC entity, a RLC service data unit (SDU) based on the PDCP PDU; and
submitting, at the shared RLC entity, a RLC PDU containing the RLC SDU to the MAC entity,
wherein generating the RLC SDU comprises:
based on the PDCP PDU being received from the first PDCP entity, generating the RLC SDU to contain a first identifier related with the first PDCP entity; and
based on the PDCP PDU being received from the second PDCP entity, generating the RLC SDU to contain a second identifier related with the second PDCP entity,
wherein the first identifier is a RB identifier of the first RB, and the second identifier is a RB identifier of the second RB.

### Claim 2 (depends on 1)

The method according to claim 1,
wherein the RLC PDU includes an indicator indicating presence of the first identifier or the second identifier, and
wherein the indicator is in a header of the RLC PDU.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising:
transmitting a message containing the RLC PDU to the network device.

### Claim 4

A user equipment (UE) for transmitting a data unit in a wireless communication system, the UE comprising:
a radio frequency (RF) unit, and
a processor configured to control RF unit, the processor configured to:
receive first configuration information for a first radio bearer (RB) and second configuration information for a second RB from a network device,
wherein a first packet data convergence protocol (PDCP) entity is configured for the first RB based on the first configuration information, and a second PDCP entity is configured for the second RB based on the second configuration information,
wherein the first configuration information and the second configuration information include an identifier of a shared radio link control (RLC) entity,
wherein both the first PDCP entity and the second PDCP entity are associated with the shared RLC entity, and
wherein the shared RLC entity is associated with a medium access control (MAC) entity;
receive, at the shared RLC entity, a PDCP protocol data unit (PDU) from one of the first PDCP entity or the second PDCP entity;
generate, at the shared RLC entity, a RLC service data unit (SDU) based on the PDCP PDU; and
submit, at the shared RLC entity, a RLC PDU containing the RLC SDU to the MAC entity,
wherein the processor is further configured to generate the RLC SDU by:
based on the PDCP PDU being received from the first PDCP entity, generating the RLC SDU to contain a first identifier related with the first PDCP entity; and
based on the PDCP PDU being received from the second PDCP entity, generating the RLC SDU to contain a second identifier related with the second PDCP entity,
wherein the first identifier is a RB identifier of the first RB, and the second identifier is a RB identifier of the second RB.