US-12628223-B2 - Method and apparatus for power saving in wireless communication system

US12628223B2US 12628223 B2US12628223 B2US 12628223B2US-12628223-B2

Abstract

The present disclosure relates to a power saving in wireless communications. According to an embodiment of the present disclosure, a method performed by a central unit (CU) of a secondary node (SN) serving a wireless device with a master node (MN) in a dual connectivity (DC) in a wireless communication system comprises: transmitting, to a distributed unit (DU) of the SN, a first message comprising an instruction to deactivate one or more cells in a secondary cell group (SCG) related to the SN, wherein the one or more cells comprise a primary secondary cell (PSCell); receiving, from the DU, a second message comprising information informing a successful deactivation of the one or more cells; determining a list of cells to be activated in the SCG based on at least one of an amount of packets received by the CU or a measurement report received from the wireless device, wherein the list of cells comprises the PSCell; transmitting, to the DU, a third message comprising information informing the list of cells to be activated in the SCG; and receiving, from the DU, a fourth message comprising information informing a successful activation of the list of cells.

Inventors

Jian Xu
Daewook Byun
Seokjung KIM

Assignees

LG ELECTRONICS INC.

Dates

Publication Date: 20260512
Application Date: 20211018
Priority Date: 20201023

Claims (10)

1 . A method comprising: transmitting, by a secondary node (SN)-central unit (CU) to an SN-distributed unit (DU), a user equipment (UE) context modification request message comprising first information related to requesting a deactivation of a secondary cell group (SCG), wherein the SCG comprises a primary secondary cell (PSCell); and receiving, by the SN-CU from the SN-DU, a UE context modification response message comprising second information for a status of the SCG, wherein the status of the SCG is related to the SCG being deactivated, wherein the SCG is deactivated for a wireless device in a connected state, wherein the wireless device is configured with a master cell group (MCG) and the SCG, wherein the MCG is associated with a master node (MN), wherein the SCG is associated with an SN, and wherein the SN comprises the SN-CU and the SN-DU.
2 . The method of claim 1 , wherein the UE context modification request message comprises at least one of: a discontinuous reception (DRX) configuration comprising information to increase an off duration of a DRX cycle for the PSCell; or an instruction to store a configuration of the PSCell.
3 . The method of claim 1 , further comprising: receiving, from the MN, a SN modification request message comprising information for requesting an activation of the SCG.
4 . The method of claim 1 , further comprising: transmitting, to the MN, an activity notification message comprising an amount of packets received by the CU; and receiving, from the MN, at least one of information notifying a list of cells to be activated in the SCG, or an instruction to activate the SCG.
5 . The method of claim 3 , wherein the SN modification request message comprises information notifying a list of cells to be activated in the SCG.
6 . The method of claim 1 , wherein the wireless device is in communication with at least one of a network, or an autonomous vehicle other than the wireless device.
7 . A secondary node (SN)-central unit (CU) comprising: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: transmitting, to an SN-distributed unit (DU), a user equipment (UE) context modification request message comprising first information related to requesting a deactivation of a secondary cell group (SCG), wherein the SCG comprises a primary secondary cell (PSCell); and receiving, from the SN-DU, a UE context modification response message comprising second information for a status of the SCG, wherein the status of the SCG is related to the SCG being deactivated, wherein the SCG is deactivated for a wireless device in a connected state, wherein the wireless device is configured with a master cell group (MCG) and the SCG, wherein the MCG is associated with a master node (MN), wherein the SCG is associated with an SN, and wherein the SN comprises the SN-CU and the SN-DU.
8 . The SN-CU CU of claim 7 , wherein the UE context modification request message comprises at least one of: a discontinuous reception (DRX) configuration comprising information to increase an off duration of a DRX cycle for the PSCell; or an instruction to store a configuration of the PSCell.
9 . The SN-CU of claim 7 , wherein the operations further comprise receiving, from the MN, a SN modification request message comprising information for requesting an activation of the SCG, and wherein the SN modification request message comprises information notifying a list of cells to be activated in the SCG.
10 . A wireless device comprising: at least one transceiver; at least one processor; and at least one memory operatively coupled to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: entering a connected state; and deactivating a secondary cell group (SCG) while in the connected state, wherein the SCG comprises a primary secondary cell (PSCell), wherein a user equipment (UE) context modification request message comprising first information related to the deactivation of the SCG is transmitted from a secondary node (SN)-central unit (CU) to an SN-distributed unit (DU), and wherein a UE context modification response message comprising second information for a status of the SCG is transmitted from the SN-DU to the SN-CU, wherein the status of the SCG is related to the SCG being deactivated, wherein the wireless device is configured with a master cell group (MCG) and the SCG, wherein the MCG is associated with a master node (MN), wherein the SCG is associated with an SN, and wherein the SN comprises the SN-CU and the SN-DU.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is the National Stage filing under 35 U.S.C. 371 of International Application No. PCT/KR2021/014484, filed on Oct. 18, 2021, which claims the benefit of earlier filing date and right of priority to Korean Application No. 10-2020-0138430, filed on Oct. 23, 2020, the contents of which are all incorporated by reference herein in their entirety. TECHNICAL FIELD The present disclosure relates to a power saving in wireless communications. BACKGROUND 3rd generation partnership project (3GPP) long-term evolution (LTE) is a technology for enabling high-speed packet communications. Many schemes have been proposed for the LTE objective including those that aim to reduce user and provider costs, improve service quality, and expand and improve coverage and system capacity. The 3GPP LTE requires reduced cost per bit, increased service availability, flexible use of a frequency band, a simple structure, an open interface, and adequate power consumption of a terminal as an upper-level requirement. Work has started in international telecommunication union (ITU) and 3GPP to develop requirements and specifications for new radio (NR) systems. 3GPP has to identify and develop the technology components needed for successfully standardizing the new RAT timely satisfying both the urgent market needs, and the more long-term requirements set forth by the ITU radio communication sector (ITU-R) international mobile telecommunications (IMT)-2020 process. Further, the NR should be able to use any spectrum band ranging at least up to 100 GHz that may be made available for wireless communications even in a more distant future. The NR targets a single technical framework addressing all usage scenarios, requirements and deployment scenarios including enhanced mobile broadband (eMBB), massive machine-type-communications (mMTC), ultra-reliable and low latency communications (URLLC), etc. The NR shall be inherently forward compatible. Dual connectivity (DC) and carrier aggregation (CA) are adopted to increase a data rate in wireless communications. In the DC and/or CA, services can be provided to a UE via a plurality of cells, including at least one special cell (SpCell) and at least one secondary cell (S Cell). However, since the UE should monitor the plurality of cells in the DC and/or CA even though there are not much data to be transmitted to and from the UE, power consumption in the UE may be an issue. SUMMARY An aspect of the present disclosure is to provide method and apparatus for power saving in a wireless communication system. Another aspect of the present disclosure is to provide method and apparatus for activating or deactivating one or more cells in a wireless communication system. According to an embodiment of the present disclosure, a method performed by a central unit (CU) of a secondary node (SN) serving a wireless device with a master node (MN) in a dual connectivity (DC) in a wireless communication system comprises: transmitting, to a distributed unit (DU) of the SN, a first message comprising an instruction to deactivate one or more cells in a secondary cell group (SCG) related to the SN, wherein the one or more cells comprise a primary secondary cell (PSCell); receiving, from the DU, a second message comprising information informing a successful deactivation of the one or more cells; determining a list of cells to be activated in the SCG based on at least one of an amount of packets received by the CU or a measurement report received from the wireless device, wherein the list of cells comprises the PSCell; transmitting, to the DU, a third message comprising information informing the list of cells to be activated in the SCG; and receiving, from the DU, a fourth message comprising information informing a successful activation of the list of cells. According to an embodiment of the present disclosure, a central unit (CU) of a secondary node (SN) serving a wireless device with a master node (MN) in a dual connectivity (DC) in a wireless communication system comprises: a transceiver; a memory; and at least one processor operatively coupled to the transceiver and the memory, and configured to: control the transceiver to transmit, to a distributed unit (DU) of the SN, a first message comprising an instruction to deactivate one or more cells in a secondary cell group (SCG) related to the SN, wherein the one or more cells comprise a primary secondary cell (PSCell); control the transceiver to receive, from the DU, a second message comprising information informing a successful deactivation of the one or more cells; determine a list of cells to be activated in the SCG based on at least one of an amount of packets received by the CU or a measurement report received from the wireless device, wherein the list of cells comprises the PSCell; control the transceiver to transmit, to the DU, a third message comprising information informing the list of cells to be activated in the SCG;