Method and device for conditionally adding and changing cell

Patent metadata

Field	Value
Publication number	US-12250595-B2
Application number	US-202418673431-A
Country	US
Kind code	B2
Filing date	May 24, 2024
Priority date	Oct 2, 2019
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

The present disclosure relates to a communication technique for merging IoT technology with a 5G communication system for supporting higher data transmission rates than 4G systems, and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. In addition, the present disclosure relates to a method for adding or changing a cell, and a device for performing same.

First claim

What is claimed is:

1. A method performed by a master node (MN) in a wireless communication system, the method comprising:
receiving, from a source-secondary node (S-SN), a first message including an indication associated with a conditional primary secondary cell (PSCell) change, a list of PSCell candidates, and execution conditions;
transmitting, to a target-secondary node (T-SN), a second message including the indication associated with the conditional PSCell change and information on a candidate cell;
receiving, from the T-SN, a third message including information on at least one cell prepared and configuration information on the at least one cell prepared;
transmitting, to a terminal, a fourth message including the configuration information on the at least one cell prepared and at least one execution condition for the at least one cell prepared;
receiving, from the terminal, a fifth message as a response to the fourth message; and
transmitting, to the S-SN, a sixth message indicating a preparation of the conditional PSCell change.

2. The method of claim 1 , further comprising:
receiving, from the terminal, a seventh message including information on a selected PSCell;
transmitting, to the S-SN, an eighth message for releasing the S-SN as a response to the seventh message;
receiving, from the S-SN, a ninth message as a response to the eighth message; and
transmitting, to the T-SN, a tenth message for an SgNB reconfiguration complete.

3. The method of claim 1 ,
wherein the first message further includes a secondary cell group (SCG) configuration,
wherein the configuration information on the at least one cell prepared is generated based on a delta configuration, and
wherein the sixth message further includes an identity of the T-SN.

4. The method of claim 1 ,
wherein the at least one cell prepared is determined by the T-SN and the execution conditions are determined by the S-SN.

5. A method performed by a target-secondary node (T-SN) in a wireless communication system, the method comprising:
receiving, from a master node (MN) which received a first message including an indication associated with a conditional primary secondary cell (PSCell) change and a list of PSCell candidates, a second message including the indication associated with the conditional PSCell change and information on a candidate cell;
deciding at least one cell prepared based on the information on candidate cell;
transmitting, to the MN, a third message including information on the at least one cell prepared;
receiving, from the MN, a fourth message for an SgNB reconfiguration complete; and
performing a random access procedure with the terminal.

6. The method of claim 5 ,
wherein the first message further includes a secondary cell group (SCG) configuration,
wherein the third message further includes configuration information on the at least one cell prepared and the configuration information is generated based on a delta configuration, and
wherein the at least one cell prepared is determined by the T-SN and the execution conditions are determined by the S-SN.

7. A method performed by a source-secondary node (S-SN) in a wireless communication system, the method comprising:
determining an initiation of a conditional primary secondary cell (PSCell) change;
transmitting, to a master node (MN), a first message including an indication associated with the conditional PSCell change and a list of PSCell candidates; and
receiving, from the MN, a second message indicating a preparation of the conditional PSCell change,
wherein the indication associated with the conditional PSCell change and information on candidate cell are transferred to a target-SN (T-SN) based on the first message, and
wherein the second message is received after a terminal applies at least one PSCell prepared by the T-SN and execution conditions determined by the S-SN.

8. The method of claim 7 , further comprising:
receiving, from the MN, a third message for releasing the S-SN after a PSCell is selected based on the conditional PSCell change; and
transmitting, to the MN, a fourth message as a response to the third message,
wherein the first message further includes a secondary cell group (SCG) configuration, and
wherein the third message further includes an identity of the T-SN.

9. A method performed by a terminal in a wireless communication system, the method comprising:
receiving, from a master node (MN), a first message associated with a conditional primary secondary cell (PSCell) change, the first message including configuration information on at least one cell prepared and execution conditions;
transmitting, to the MN, a second message as a response to the first message;
determining whether an execution condition of one candidate PSCell is satisfied based on the at least one cell prepared and the execution conditions;
in case that the execution condition of the one candidate PSCell is satisfied, transmitting, to the MN, a third message including information on a selected PSCell corresponding to the one cell; and
performing a random access procedure with a target-SN (T-SN) of the selected PSCell.

10. The method of claim 9 ,
wherein the at least one cell prepared is determined by the T-SN and the execution conditions are determined by the S-SN.

11. A master node (MN) in a wireless communication system, the MN comprising:
a transceiver; and
a controller configured to:
receive, from a source-secondary node (S-SN), a first message including an indication associated with a conditional primary secondary cell (PSCell) change, a list of PSCell candidates, and execution conditions,
transmit, to a target-secondary node (T-SN), a second message including the indication associated with the conditional PSCell change and information on a candidate cell;
receive, from the T-SN, a third message including information on at least one cell prepared and configuration information on the at least one cell prepared;
transmit, to a terminal, a fourth message including the configuration information on the at least one cell prepared and at least one execution condition for the at least one cell prepared;
receive, from the terminal, a fifth message as a response to the fourth message, and
transmit, to the S-SN, a sixth message indicating a preparation of the conditional PSCell change.

12. The MN of claim 11 , wherein the controller is further configured to:
receive, from the terminal, a seventh message including information on a selected PSCell,
transmit, to the S-SN, an eighth message for releasing the S-SN as a response to the seventh message,
receive, from the S-SN, a ninth message as a response to the eighth message, and
transmit, to the T-SN, a tenth message for an SgNB reconfiguration complete.

13. The MN of claim 11 ,
wherein the first message further includes a secondary cell group (SCG) configuration,
wherein the configuration information on the at least one cell prepared is generated based on a delta configuration, and
wherein the sixth message further includes an identity of the T-SN.

14. The MN of claim 11 ,
wherein the at least one cell prepared is determined by the T-SN and the execution conditions are determined by the S-SN.

15. A target-secondary node (T-SN) in a wireless communication system, the T-SN comprising:
a transceiver; and
a controller configured to:
receive, from a master node (MN) which received a first message including an indication associated with a conditional primary secondary cell (PSCell) change and a list of PSCell candidates, a second message including the indication associated with the

Assignees

• Samsung Electronics Co Ltd

Inventors

• Hwang June
• Van Der Velde Himke
• Bae Beomsik
• Kim Soenghun

Classifications

• H04W36/00698

  using different RATs · CPC title

• H04W8/22 Primary

  Processing or transfer of terminal data, e.g. status or physical capabilities · CPC title

• H04W36/0079

  in case of hand-off failure or rejection · CPC title

• H04W74/08

  Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) · CPC title

• H04W36/0016 Primary

  Hand-off preparation specially adapted for end-to-end data sessions · CPC title