Radio link failure signaling to a secondary node

Patent metadata

Field	Value
Publication number	US-2026046967-A1
Application number	US-202318998686-A
Country	US
Kind code	A1
Filing date	Aug 8, 2023
Priority date	Aug 8, 2022
Publication date	Feb 12, 2026
Grant date	—

Abstract

A first network node configured to communicate wireless device(s) (WD). The WD is configured with a dual connectivity (DC) configuration including at least one parameter usable to communicate with a master node (MN) and a secondary node (SN). The first network node is configured to determine that the WD has lost connectivity with the MN, where the WD has declared a radio link failure (RLF) in the MCG, and receive an RLF Report from a third network node at which a communication re-establishment attempt was made in response to the RLF and/or a fourth network node at which the RLF Report was fetched. Upon identifying the RLF report includes information about the RLF occurring while a fast MCG recovery was configured and the SCG had an SCG status, the RLF report is forwarded to the SN including information about a fast MCG recovery failure.

First claim

1 . A first network node configured to communicate with a wireless device, WD, a second network node, a third network node, and a fourth network node, the WD being configured with a dual connectivity, DC, configuration including at least one parameter usable to communicate with a master node, MN, and a secondary node, SN, the first network node being the MN of the DC configuration and associated with a master cell group, MCG, the second network node being the SN of the DC configuration and associated with a secondary cell group, SCG, the second network node and the third network node being different nodes the first network node configured to:
determine that the WD has lost connectivity with the MN, the WD having declared a radio link failure, RLF, in the MCG; receive an RLF Report from one or both of:
the third network node at which a communication re-establishment attempt was made by the WD in response to the RLF; and
the fourth network node at which the RLF Report was fetched; and
upon identifying the RLF report comprises information about the RLF occurring while a fast MCG recovery was configured and the SCG had an SCG status, forward the RLF report to the SN including information about a fast MCG recovery failure.

2 . The first network node of claim 1 , wherein the RLF Report is received via an Xn Application Protocol, XnAP, message.

3 . The first network node of claim 2 , wherein the XnAP message includes an XnAP Failure Indication message, the XnAP Failure Indication message comprising an indication indicating one or both of:
the RLF occurred while the fast MCG recovery was configured; and the SCG status.

4 . The first network node of claim 3 , wherein the indication is one or more of:
an initiating condition associated with the fast MCG recovery failure; an information element, IE, associated with the fast MCG recovery failure; included in the RLF Report; and the SCG status at the time of the MCG recovery.

5 . The first network node of claim 1 , wherein:
the SCG status is one or more of:
deactivated;
suspended; and
de-configured; and
the first network node is further configured to:
upon identifying that the RLF report comprises information about the RLF occurring while a fast MCG recovery was configured and the SCG status is deactivated, optimize one or both of the fast MCG recovery and a SCG deactivation process.

6 . (canceled)

7 . The first network node of claim 5 , wherein optimizing the one or both the fast MCG recovery and the SCG deactivation process includes one or more of:
preventing the SN from enabling SCG activation or SCG deactivation; optimizing SCG activation and deactivation policies; optimizing SCG addition; optimizing primary secondary cell, PSCell, change policies; informing the SN that the fast MCG recovery is configured; and disabling one or both of the SCG activation and the SCG deactivation when radio conditions are below a predetermined threshold.

8 . The first network node of claim 1 , wherein the first network node is further configured to:
configure the WD with a fast master cell group, MCG, recovery configuration usable for responding to the RLF in the MCG; and configure the WD with the second network node operating as the SN to allow one or both of an SCG activation and an SCG deactivation.

9 . The first network node of claim 1 , wherein the third network node is an access node configured to communicate with the WD and the first network node.

10 . The first network node of claim 1 , wherein the RLF occurred in a first cell of the MCG, and the first network node is further configured to:
receive the RLF Report from the WD via a second cell different from the first cell.

11 . A method in a first network node configured to communicate with a wireless device, WD, a second network node, a third network node, and a fourth network node, the WD being configured with a dual connectivity, DC, configuration including at least one parameter usable to communicate with a master node, MN, and a secondary node, SN, the first network node being the MN of the DC configuration and associated with a master cell group, MCG, the second network node being the SN of the DC configuration and associated with a secondary cell group, SCG, the second network node and the third network node being different nodes the method comprising:
determining that the WD has lost connectivity with the MN, the WD having declared a radio link failure, RLF, in the MCG; receiving an RLF Report from one or both of:
the third network node at which a communication re-establishment attempt was made by the WD in response to the RLF; and
the fourth network node at which the RLF Report was fetched; and
upon identifying the RLF report comprises information about the RLF occurring while a fast MCG recovery was configured and the SCG had an SCG status, forwarding the RLF report to the SN including information about a fast MCG recovery failure.

12 . The method of claim 11 , wherein the RLF Report is received via an Xn Application Protocol, XnAP, message.

13 . The method of claim 12 , wherein the XnAP message includes an XnAP Failure Indication message, the XnAP Failure Indication message comprising an indication indicating one or both of:
the RLF occurred while the fast MCG recovery was configured; and the SCG status.

14 . The method of claim 13 , wherein the indication is one or more of:
an initiating condition associated with the fast MCG recovery failure; an information element, IE, associated with the fast MCG recovery failure; included in the RLF Report; and the SCG status at the time of the MCG recovery.

15 . The method of claim 11 , wherein:
the SCG status is one or more of:
deactivated;
suspended; and
de-configured, and
upon identifying the RLF report comprises information about the RLF occurring while a fast MCG recovery was configured and the SCG status is deactivated, optimizing one or both of the fast MCG recovery and a SCG deactivation process.

16 . (canceled)

17 . The method of claim 15 , wherein optimizing the one or both the fast MCG recovery and the SCG deactivation process includes one or more of:
preventing the SN from enabling SCG activation or SCG deactivation; optimizing SCG activation and deactivation policies; optimizing SCG addition; optimizing primary secondary cell, PSCell, change policies; informing the SN that the fast MCG recovery is configured; and disabling one or both of the SCG activation and the SCG deactivation when radio conditions are below a predetermined threshold.

18 . The method of claim 11 , wherein the method further includes:
configuring the WD with an MCG recovery configuration usable for responding to the RLF in the MCG; and configuring the WD with the second network node operating as the SN to allow one or both of an SCG activation and an SCG deactivation.

19 . The method of claim 11 , wherein the third network node is an access node configured to communicate with the WD and the first network node.

20 . The method of claim 11 , wherein the RLF occurred in a first cell of the MCG, and the method further includes:
receiving the RLF Report from the WD via a second cell different from the first cell.

21 . A second network node configured to communicate with a wireless device, WD, a first network node, and a third network node, the WD being configured with a dual connectivity, DC, configuration including at least one parameter usable to communicate with a master

Assignees

• Ericsson Telefon Ab L M

Inventors

• Muller Julien
• Torabian Esfahani Tahmineh
• Parichehrehteroujeni Ali

Classifications

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W76/18 Primary

  Management of setup rejection or failure · CPC title

• H04W76/19 Primary

  Connection re-establishment · CPC title