Apparatus and method for performing dual connectivity in wireless communication system

Patent metadata

Field	Value
Publication number	US-12587436-B2
Application number	US-202318530866-A
Country	US
Kind code	B2
Filing date	Dec 6, 2023
Priority date	Sep 27, 2018
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A method of a central unit-control plane (CU-CP) included in a base station in a wireless communication system and an apparatus therefor are provided. The method includes identifying information on a radio link of at least one cell associated with the base station, transmitting, to a central unit-user plane (CU-UP), information indicating downlink transmission stop or resume of the CU-UP included in the base station based on the information on the radio link, and transmitting, to a distributed unit (DU), information indicating downlink transmission stop or resume of the DU based on the information on the radio link. The method relates to converging a 4th-Generation (4G) or a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4G system with a technology for Internet of Things (IoT), and may be applied to intelligent services based on the 5G communication technology and the IoT-related technology.

First claim

What is claimed is:

1 . A method performed by a network node configured to perform functions of central unit-control plane (CU-CP) of a next generation node B (gNB), the method comprising:
transmitting, through E1l interface, to a central unit-user plane (CU-UP), a bearer context modification request message including cell group information, the cell group information including:
a cell group identifier (ID) for indicating a cell group being one of a master cell group (MCG) and a secondary cell group (SCG), and
downlink transmission information being a value indicating a resume of downlink transmission for the cell group, among the value and another value indicating a stop of the downlink transmission, wherein the downlink transmission information is used to resume the downlink transmission stopped before transmitting the bearer context modification request message; and
receiving, through the E1 interface, from the CU-UP, a bearer context modification response message.

2 . The method of claim 1 , wherein the cell group information further includes:
uplink (UL) configuration information for indicating whether the cell group is used for UL traffic, and radio access technology (RAT) type information for indicating one of RATs including evolved-universal mobile telecommunications system (UMTS) terrestrial radio access (E-UTRA) and new radio (NR).

3 . The method of claim 1 , further comprising:
transmitting, through F1 interface, to a distributed unit (DU), a user equipment (UE) context modification request message including a transmission indicator, wherein the transmission indicator indicates a stop or a resume of downlink transmission for a UE in the DU.

4 . The method of claim 1 , further comprising:
receiving, from an evolved node B (eNB), a modification request message to modify bearer context related to the gNB, wherein the eNB and the gNB are associated with a dual connectivity, wherein the eNB corresponds to a master node (MN), and wherein the gNB corresponds to a secondary node (SN).

5 . The method of claim 1 ,
wherein the CU-CP has a radio resource control (RRC) and a control part of a packet data convergence protocol (PDCP) protocol, and wherein the CU-UP has a user plane part of the PDCP protocol.

6 . A method performed by a network node configured to perform functions of central unit-user plane (CU-UP) of a next generation node B (gNB), the method comprising:
receiving, through E1 interface, from a central unit-control plane (CU-CP), a bearer context modification request message including cell group information, the cell group information including:
a cell group identifier (ID) for indicating a cell group being one of a master cell group (MCG) and a secondary cell group (SCG), and
downlink transmission information being a value indicating a resume of downlink transmission for the cell group, among the value and another value indicating a stop of the downlink transmission, wherein the downlink transmission information is used to resume the downlink transmission stopped before receiving the bearer context modification request message; and
transmitting, through the E1 interface, to the CU-CP, a bearer context modification response message.

7 . The method of claim 6 , wherein the cell group information further includes:
uplink (UL) configuration information for indicating whether the cell group is used for UL traffic, and radio access technology (RAT) type information for indicating one of RATs including evolved-universal mobile telecommunications system (UMTS) terrestrial radio access (E-UTRA) and new radio (NR).

8 . The method of claim 6 ,
wherein the gNB and an evolved node B (eNB) are associated with a dual connectivity, wherein the eNB corresponds to a master node (MN), and wherein the gNB corresponds to a secondary node (SN).

9 . The method of claim 6 ,
wherein the CU-CP has a radio resource control (RRC) and a control part of a packet data convergence protocol (PDCP) protocol, and wherein the CU-UP has a user plane part of the PDCP protocol.

10 . The method of claim 9 , further comprising:
receiving, through E1 interface, from the CU-CP, a previous bearer context modification request message including previous cell group information before receiving the bearer context modification request message, wherein the previous cell group information includes the cell group ID and another downlink transmission information indicating the stop of the downlink transmission.

11 . A network node configured to perform functions of central unit-control plane (CU-CP) of a next generation node B (gNB), comprising:
at least one processor; and memory storing instructions that, when executed by the at least one processor, cause the CU-CP to:
transmit, through E1 interface, to a central unit-user plane (CU-UP), a bearer context modification request message including cell group information, the cell group information including:
a cell group identifier (ID) for indicating a cell group being one of a master cell group (MCG) and a secondary cell group (SCG), and
downlink transmission information being a value indicating a resume of downlink transmission for the cell group, among the value and another value indicating a stop of the downlink transmission, wherein the downlink transmission information is used to resume the downlink transmission stopped before transmitting the bearer context modification request message, and

receive, through the E1 interface, from the CU-UP, a bearer context modification response message.

12 . The network node of claim 11 , wherein the cell group information further includes:
uplink (UL) configuration information for indicating whether the cell group is used for UL traffic, and radio access technology (RAT) type information for indicating one of RATs including evolved-universal mobile telecommunications system (UMTS) terrestrial radio access (E-UTRA) and new radio (NR).

13 . The network node of claim 11 , wherein the instructions, when executed by the processor, cause the CU-CP to:
transmit, through F1 interface, to a distributed unit (DU), a user equipment (UE) context modification request message including a transmission indicator, and wherein the transmission indicator indicates a stop or a resume of downlink transmission for a UE in the DU.

14 . The network node of claim 11 ,
wherein the instructions, when executed by the processor, cause the CU-CP to: receive, from an evolved node B (eNB), a modification request message to modify bearer context related to the gNB, wherein the eNB and the gNB are associated with a dual connectivity, wherein the eNB corresponds to a master node (MN), and wherein the gNB corresponds to a secondary node (SN).

15 . The network node of claim 11 ,
wherein the CU-CP has a radio resource control (RRC) and a control part of a packet data convergence protocol (PDCP) protocol, and wherein the CU-UP has a user plane part of the PDCP protocol.

16 . A network node configured to perform functions of central unit-user plane (CU-UP) of a next generation node B (gNB), comprising:
memory storing instructions, a transceiver; and a processor, wherein the instructions, when executed by the processor, cause the CU-UP to:
receive, through E1 interface, from a central unit-control plane (CU-CP), a bearer context modification request message including cell group information, the cell group information including:
a cell group identifier (ID) for indicating a cell group being one of a master cell group (MCG) and a secondary cell group (SCG), and
downlink trans

Assignees

• Samsung Electronics Co Ltd

Inventors

• Yoo Seungbo
• Wang Weiwei
• Bae Beomsik

Classifications

• H04W28/0252 Primary

  per individual bearer or channel (dynamic wireless traffic scheduling H04W72/12) · CPC title

• H04L67/10

  in which an application is distributed across nodes in the network (software deployment G06F8/60; multiprogramming arrangements G06F9/46) · CPC title

• H04W88/02

  Terminal devices · CPC title

• H04W88/085

  Access point devices with remote components · CPC title

• H04W40/36

  due to handover · CPC title