Master node, communication control method, and communication apparatus

Inventors: Daiki Maemoto (Kariya-city, JP); Hideaki Takahashi (Kariya-city, JP)

Assignees: DENSO CORPORATION; TOYOTA JIDOSHA KABUSHIKI KAISHA

H04W76/15 H04W28/12 H04W76/20 H04W80/02

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Quick Facts

Patent No.: US 12707520
App. No.: 18/396,604
Granted: Aug 11, 2026
Kind: B2

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Abstract

A master node is connected to a communication apparatus together with a secondary node using dual connectivity. The master node comprises a controller having a packet data convergence protocol (PDCP) entity and a first radio link control (RLC) entity, the PDCP entity outputting a PDCP protocol data unit (PDU) to the first RLC entity and outputting a duplication of the PDCP PDU to a second RLC entity of the secondary node. The PDCP entity deactivates the duplication of the PDCU PDU for the second RLC entity in a case where a secondary cell group associated with the secondary node is deactivated.

Claims (12)

1 . A master node that is connected to a communication apparatus and is connected to a secondary node using dual connectivity, the master node comprising:

a controller including a packet data convergence protocol (PDCP) entity and a first radio link control (RLC) entity, the PDCP entity outputting a PDCP protocol data unit (PDU) to the first RLC entity and outputting a duplication of the PDCP PDU to a second RLC entity of the secondary node; and

a transmitter configured to transmit, to the communication apparatus, a Radio Resource Control (RRC) message including first information configuring the duplication of the PDCP PDU and second information configuring deactivation of a secondary cell group associated with the secondary node;

wherein the duplication of the PDCP PDU for the second RLC entity is deactivated in a case where the secondary cell group, including a serving cell activated for a logical channel associated with the second RLC entity, is deactivated based on the second information.

2 . A communication method in a master node that is connected to a communication apparatus and is connected to a secondary node using dual connectivity, the master node including a packet data convergence protocol (PDCP) entity and a first radio link control (RLC) entity, the communication control method comprising:

causing the PDCP entity to output a PDCP protocol data unit (PDU) to the first RLC entity and output a duplication of the PDCP PDU to a second RLC entity of the secondary node; and

transmitting, to the communication apparatus, a Radio Resource Control (RRC) message including first information configuring the duplication of the PDCP PDU and second information configuring deactivation of a secondary cell group associated with the secondary node;

3 . A communication apparatus that is connected to a master node and is connected to a secondary node using dual connectivity, the communication apparatus comprising:

a controller configured to control reception of a packet data convergence protocol (PDCP) protocol data unit (PDU) and a PDCP PDU which is duplicated; and

a communicator configured to receive a Radio Resource Control (RRC) message including first information configuring the duplication of the PDCP PDU and second information configuring a deactivation of a secondary cell group associated with the secondary node;

wherein the duplication of the PDCU PDU for the second RLC entity is deactivated in a case where the secondary cell group, including a serving cell activated for a logical channel associated with the second RLC entity, is deactivated based on the second information.