# US 12,003,983 B2 · Activation of secondary cell group configuration upon master cell group failure detection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,003,983 B2 - Document ID: US12003983B2 - Status: Granted - Kind: B2 - Application number: 17/593,237 - Filed: 2020-03-27 - Published: 2022-05-19 - Granted: 2024-06-04 - Earliest claimed: 2019-03-28 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Youngdae Lee; Sunghoon Jung; Taehun Kim - Web page: https://patentgrep.com/patent/US12003983B2 ## CPC - H04W 24/04: Arrangements for maintaining operational condition - H04W 76/19: Connection re-establishment - H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 74/0838: using contention-free random access [CFRA] - H04W 76/15: Setup of multiple wireless link connections - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method and apparatus for activation of secondary cell group (SCG) configuration upon master cell group (MCG) failure detection in a wireless communication system is provided. A wireless device delays activation of a SCG. When the wireless device detects a failure on a master cell group (MCG) while delaying the activation of the SCG, the wireless device activates the SCG, and performs a random access procedure on a cell of the SCG. ## Claims ### Claim 1 A method performed by a wireless device adapted to operate in a wireless communication system, the method comprising: receiving, from a network, a configuration of a secondary cell group (SCG), wherein the wireless device is configured with a master cell group (MCG) and the SCG in dual connectivity, wherein the MCG comprises a primary cell (PCell) and optionally one or more secondary cells (SCells), wherein the SCG comprises a primary SCell (PSCell) and optionally one or more SCells, wherein the configuration of the SCG includes a suspension indication; based on the suspension indication, storing the configuration of the SCG but delaying activation of the SCG; upon detecting a failure on the MCG, based on the activation of the SCG having been delayed: (i) activating the SCG based on the configuration of the SCG; and (ii) performing a random access procedure on a cell of the SCG, wherein the random access procedure includes informing information related to detection of the failure on the MCG, and wherein the information related to detection of the failure on the MCG is carried from a secondary node (SN) controlling the SCG to a master node (MN) controlling the MCG. ### Claim 2 (depends on 1) The method of claim 1, wherein delaying the activation of the SCG comprises suspending the configuration of the SCG. ### Claim 3 (depends on 2) The method of claim 2, wherein the configuration of the SCG includes a configuration of one or more split radio bearers (RBs), and wherein a transmission of the one or more split RBs related to the SCG is suspended. ### Claim 4 (depends on 1) The method of claim 1, wherein delaying the activation of the SCG comprises applying the configuration in which the cell of the SCG is configured to be in a deactivated state and/or a dormant state. ### Claim 5 (depends on 1) The method of claim 1, wherein activating the SCG based on the configuration comprises applying the configuration in which the cell of the SCG is configured to be in an activated state. ### Claim 6 (depends on 1) The method of claim 1, wherein the cell of the SCG is the PSCell. ### Claim 7 (depends on 1) The method of claim 1, wherein the information related to detection of the failure on the MCG is indicated via a message 3 of the random access procedure. ### Claim 8 (depends on 1) The method of claim 1, wherein the information related to detection of the failure on the MCG is indicated over a SCG transmission of a MCG split signaling radio bearer (SRB) and/or a SCG SRB. ### Claim 9 (depends on 1) The method of claim 1, wherein the wireless device is in communication with at least one of a mobile device, a network, and/or autonomous vehicles other than the wireless device. ### Claim 10 A wireless device adapted to operate in a wireless communication system, the wireless device comprising: at least one transceiver; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising: receiving, from a network, a configuration of a secondary cell group (SCG), wherein the wireless device is configured with a master cell group (MCG) and the SCG in dual connectivity, wherein the MCG comprises a primary cell (PCell) and optionally one or more secondary cells (SCells), wherein the SCG comprises a primary SCell (PSCell) and optionally one or more SCells, wherein the configuration of the SCG includes a suspension indication; based on the suspension indication, storing the configuration of the SCG but delaying activation of the SCG; upon detecting a failure on the MCG, based on the activation of the SCG having been delayed: (i) activating the SCG based on the configuration of the SCG; and (ii) performing a random access procedure on a cell of the SCG, wherein the random access procedure includes informing information related to detection of the failure on the MCG, and wherein the information related to detection of the failure on the MCG is carried from a secondary node (SN) controlling the SCG to a master node (MN) controlling the MCG. ### Claim 11 (depends on 10) The wireless device of claim 10, wherein delaying the activation of the SCG comprises suspending the configuration of the SCG. ### Claim 12 (depends on 10) The wireless device of claim 10, wherein delaying the activation of the SCG comprises applying the configuration in which the cell of the SCG is configured to be in a deactivated state and/or a dormant state. ### Claim 13 A processing apparatus adapted to control a wireless device in a wireless communication system, the processing apparatus comprising: at least one memory; at least processor, operably coupled to the at least one memory, wherein the at least one processor is configured to: obtain a configuration of a secondary cell group (SCG), wherein the wireless device is configured with a master cell group (MCG) and the SCG in dual connectivity, wherein the MCG comprises a primary cell (PCell) and optionally one or more secondary cells (SCells), wherein the SCG comprises a primary SCell (PSCell) and optionally one or more SCells, wherein the configuration of the SCG includes a suspension indication; based on the suspension indication, store the configuration of the SCG but delay activation of the SCG; upon detecting a failure on the MCG, based on the activation of the SCG having been delayed: activate the SCG based on the configuration of the SCG; and perform a random access procedure on a cell of the SCG, wherein the random access procedure includes informing information related to detection of the failure on the MCG, and wherein the information related to detection of the failure on the MCG is carried from a secondary node (SN) controlling the SCG to a master node (MN) controlling the MCG.