Methods for addressing secondary cell group status in radio link failure reports

Patent metadata

Field	Value
Publication number	US-2026046645-A1
Application number	US-202319101419-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 method, system and apparatus are disclosed. A wireless device (WD) configured to communicate with a network node is described. The WD is configured with a dual connectivity (DC) configuration including one or more parameters usable by the WD to communicate using a master cell group (MCG) and a secondary cell group (SCG). The WD is configurable with a fast MCG link recovery configuration and is configured to determine a failure of the MCG has occurred and determine a failure of an MCG recovery procedure has occurred. The WD is further configured to, in response to determining the failure of the MCG recovery procedure has occurred, store information related to a reason for the failure of the MCG recovery procedure and cause transmission of the stored information to the network node.

First claim

1 . A wireless device, WD, configured to communicate with a network node, the WD being configured with a dual connectivity, DC, configuration including one or more parameters usable by the WD to communicate using a master cell group, MCG, and a secondary cell group, SCG, the WD being configurable with a fast MCG link recovery configuration, the WD being configured to:
determine a failure of the MCG has occurred; determine a failure of an MCG recovery procedure has occurred; and in response to determining the failure of the MCG recovery procedure has occurred:
store information related to a reason for the failure of the MCG recovery procedure, the reason including an indication that the SCG is deactivated; and
cause transmission of the stored information to the network node.

2 .- 10 . (canceled)

11 . A method in a wireless device, WD, configured to communicate with a network node, the WD being configured with a dual connectivity, DC, configuration including one or more parameters usable by the WD to communicate using a master cell group, MCG, and a secondary cell group, SCG, the WD being configurable with a fast MCG link recovery configuration, the method comprising:
determining a failure of the MCG has occurred; determining a failure of an MCG recovery procedure has occurred; and in response to determining the failure of the MCG recovery procedure has occurred:
storing information related to a reason for the failure of the MCG recovery procedure, the reason including an indication that the SCG is deactivated; and
transmitting the stored information to the network node.

12 . The method of claim 1 , wherein the method further includes:
determining the failure of the MCG recovery procedure has occurred after detection of a radio link failure at the MCG.

13 . The method of claim 12 , wherein the information includes an indication indicating the reason for the failure of the MCG recovery procedure, and the method further includes:
if a first timer, T316, has expired:
setting the indication to an expiry of the T316.

14 . The method of claim 13 , wherein the method further includes:
if the T316 has not expired and the SCG was deactivated at an initiation time of the MCG recovery procedure:
setting the indication to SCG deactivated.

15 . The method of claim 13 , wherein the method further includes:
if the SCG has failed while the T316 was running or before transmitting MCG failure information:
setting a primary secondary cell identity to a global cell identity of a primary secondary cell group, PSCell, if available, otherwise to a physical cell identity and carrier frequency of the PSCell.

16 . The method of claim 15 , wherein the method further includes:
if the SCG has failed while the T316 was running or before transmitting MCG failure information and if a second timer, T310, expires at the SCG while the T316 was running or before transmitting the MCG failure information:
setting the indication to expiry of the T310 at SCG.

17 . The method of claim 15 , wherein the method further includes:
if the WD declares a radio link failure at the SCG due to a random access problem indication from SCG Medium Access Control, MAC, while the T316 was running or before transmitting the MCG failure information:
setting the indication to SCG random access problem.

18 . The method of claim 15 , wherein the method further includes:
if the WD declares a radio link failure at the SCG due to reaching a maximum number of retransmissions from an MCG radio link control, RLC, while the T316 was running or before transmitting the MCG failure information:
setting the indication to SCG RLC maximum number of retries.

19 . The method of claim 13 , wherein the method further includes:
transmitting a radio link failure report including a plurality of fields, one field of the plurality of fields including the indication.

20 . The method of claim 11 , wherein the information related to the reason for the failure of the MCG recovery procedure is transmitted by the WD in an information response message.

21 . A network node configured to communicate with a wireless device, WD, the WD being configured with a dual connectivity, DC, configuration including one or more parameters usable by the WD to communicate using a master cell group, MCG, and a secondary cell group, SCG, the WD being configurable with a fast MCG link recovery configuration, the network node being configured to:
receive, from the WD, information related to a reason for a failure of an MCG recovery procedure, the reason including an indication that the SCG is deactivated, the MCG recovery procedure being associated with a failure of the MCG; and perform one or more actions based on the information.

22 .- 30 .

31 . A method in a network node configured to communicate with a wireless device, WD, the WD being configured with a dual connectivity, DC, configuration including one or more parameters usable by the WD to communicate using a master cell group, MCG, and a secondary cell group, SCG, the WD being configurable with a fast MCG link recovery configuration, the method comprising:
receiving, from the WD, information related to a reason for a failure of an MCG recovery procedure, the reason including an indication that the SCG is deactivated, the MCG recovery procedure being associated with a failure of the MCG; and performing one or more actions based on the information.

32 . The method of claim 31 , wherein the failure of the MCG recovery procedure occurs after a radio link failure at the MCG.

33 . The method of claim 32 , wherein the information includes an indication indicating the reason for the failure of the MCG recovery procedure, and if a first timer, T316, has expired, the indication is set to an expiry of the T316.

34 . The method of claim 33 , wherein if the T316 has not expired and the SCG was deactivated at an initiation time of the MCG recovery procedure, the indication is set to SCG deactivated.

35 . The method of claim 33 , wherein if the SCG has failed while the T316 was running or before transmitting MCG failure information, a primary secondary cell identity is set to a global cell identity of a primary secondary cell group, PSCell, if available, otherwise to a physical cell identity and carrier frequency of the PSCell.

36 . The method of claim 35 , wherein if the SCG has failed while the T316 was running or before transmitting MCG failure information and if a second timer, T310, expires at the SCG while the T316 was running or before transmitting the MCG failure information, the indication is set to expiry of the T310 at SCG.

37 . The method of claim 35 , wherein if the WD declares a radio link failure at the SCG due to a random access problem indication from SCG Medium Access Control, MAC, while the T316 was running or before transmitting the MCG failure information, the indication is set to SCG random access problem.

38 . The method of claim 35 , wherein the if the WD declares a radio link failure at the SCG due to reaching a maximum number of retransmissions from an MCG radio link control, RLC, while the T316 was running or before transmitting the MCG failure information, the indication is set to SCG RLC maximum number of retries.

39 . The method of claim 33 , wherein the method further includes one or both of:
receiving a radio link failure report including a plurality of fields, one field of the plurality of fields including the indicatio

Assignees

• Ericsson Telefon Ab L M

Inventors

• Torabian Esfahani Tahmineh
• Ramachandra Pradeepa
• Parichehrehteroujeni Ali
• Belleschi Marco
• Bergqvist Jens

Classifications

• H04W76/15

  Setup of multiple wireless link connections · CPC title

• H04W76/19

  Connection re-establishment · CPC title

• H04W24/04 Primary

  Arrangements for maintaining operational condition · CPC title

• H04W76/18 Primary

  Management of setup rejection or failure · CPC title