US 12,446,092 B2
Master node, secondary node, and methods therefor
Hisashi Futaki, Tokyo (JP); and Sadafuku Hayashi, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/630,003
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jun. 17, 2020, PCT No. PCT/JP2020/023857
§ 371(c)(1), (2) Date Jan. 25, 2022,
PCT Pub. No. WO2021/019940, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 2019-139251 (JP), filed on Jul. 29, 2019.
Prior Publication US 2022/0256637 A1, Aug. 11, 2022
Int. Cl. H04W 76/19 (2018.01); H04W 76/15 (2018.01); H04W 76/27 (2018.01); H04W 76/34 (2018.01)
CPC H04W 76/19 (2018.02) [H04W 76/15 (2018.02); H04W 76/27 (2018.02); H04W 76/34 (2018.02)] 12 Claims
OG exemplary drawing
 
1. A method for a Secondary node of a dual connectivity with a Master node, the method comprising:
communicating, with a user terminal, using a Secondary Cell Group (SCG), which is a group of serving cells associated with the Secondary node;
receiving a Radio Resource Control (RRC) Transfer message from the Master node if radio link failure is detected for a Master Cell Group (MCG) which is a group of serving cells associated with the Master node, the RRC Transfer message including a Packet Data Convergence Protocol control-plane (PDCP-C) Protocol Data Unit (PDU) encapsulating a RRC Reconfiguration message, the RRC Transfer message including, in addition to the RRC Reconfiguration message, information indicating to the Secondary node that the RRC Reconfiguration message relates to a recovery of the MCG failure; and
transmitting the RRC Reconfiguration message to the user terminal before a release of resources.