# US 2022/0046485 A1 · Method and apparatus for triggering reselection for relay > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0046485 A1 - Document ID: US20220046485A1 - Status: Published application - Kind: A1 - Application number: 17/358,585 - Filed: 2021-06-25 - Published: 2022-02-10 - Earliest claimed: 2020-08-05 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jongwoo Hong; Youngdae Lee; Seoyoung Back; Giwon Park - Web page: https://patentgrep.com/patent/US20220046485A1 ## CPC - H04W 36/0009: {for a plurality of users or terminals, e.g. group communication or moving wireless networks (user group management H04W4/08; processing of subscriber group data H04W8/186)} - H04W 36/00837: {Determination of triggering parameters for hand-off} - H04W 36/00838: {Resource reservation for handover} - H04W 36/03: {Reselecting a link using a direct mode connection} - H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)} - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 36/033: {in pre-organised networks} - H04W 36/037: {by reducing handover delay, e.g. latency} - H04W 88/04: adapted for relaying to or from another terminal or user - H04W 92/18: between terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Provided are a method for performing wireless communication by a first device, and an apparatus for supporting same. The method may comprise: establishing a radio resource control (RRC) connection with a first base station; establishing a PC5 connection with a second device; receiving an RRC reconfiguration message for handover from the first base station; establishing an RRC connection with a second base station based on the RRC reconfiguration message; and based on (i) the first device which is a relay device relaying communication between the second device and the first base station, and (ii) the first device establishing the RRC connection with the second base station, transmitting information regarding relay reselection to the second device. ## Claims ### Claim 1 A method for performing wireless communication by a first device, the method comprising: establishing a radio resource control (RRC) connection with a first base station; establishing a PC5 connection with a second device; receiving an RRC reconfiguration message for handover from the first base station; establishing an RRC connection with a second base station based on the RRC reconfiguration message; and based on (i) the first device which is a relay device relaying communication between the second device and the first base station, and (ii) the first device establishing the RRC connection with the second base station, transmitting information regarding relay reselection to the second device. ### Claim 2 (depends on 1) The method of claim 1, wherein, based on the first device detecting a radio link failure (RLF) for the RRC connection between the first base station and the first device, the information regarding the relay reselection is transmitted to the second device. ### Claim 3 (depends on 1) The method of claim 1, wherein, based on the first device detecting a beam failure for a serving beam, the information regarding the relay reselection is transmitted to the second device. ### Claim 4 (depends on 1) The method of claim 1, wherein, based on transition of the first device to an RRC_IDLE state, the information regarding the relay reselection is transmitted to the second device. ### Claim 5 (depends on 1) The method of claim 1, wherein, based on transition of the first device to an RRC_INACTIVE state, the information regarding the relay reselection is transmitted to the second device. ### Claim 6 (depends on 1) The method of claim 1, wherein the relay reselection by the second device is triggered based on the information regarding the relay reselection. ### Claim 7 (depends on 6) The method of claim 6, wherein a third device is selected, based on the information regarding the relay reselection, by the second device as a relay device for relaying communication between the second device and the first base station. ### Claim 8 (depends on 1) The method of claim 1, wherein the PC5 connection between the first device and the second device is released based on the information regarding the relay reselection. ### Claim 9 (depends on 1) The method of claim 1, wherein a bandwidth part (BWP) of the second device is switched based on the information regarding the relay reselection. ### Claim 10 (depends on 9) The method of claim 9, wherein the BWP of the second device is switched from a dormant BWP to an active BWP. ### Claim 11 (depends on 9) The method of claim 9, wherein, based on the second device determining random access to the first base station, the BWP of the second device is switched from a dormant BWP to a default BWP or an initial BWP. ### Claim 12 (depends on 1) The method of claim 1, wherein, based on the second device being connected with the base station via the first device, radio link monitoring (RLM) of the second device for the base station is suspended. ### Claim 13 A first device configured to perform wireless communication, the first device comprising: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: establish a radio resource control (RRC) connection with a first base station; establish a PC5 connection with a second device; receive an RRC reconfiguration message for handover from the first base station; establish an RRC connection with a second base station based on the RRC reconfiguration message; and based on (i) the first device which is a relay device relaying communication between the second device and the first base station, and (ii) the first device establishing the RRC connection with the second base station, transmit information regarding relay reselection to the second device. ### Claim 14 (depends on 13) The first device of claim 13, wherein, based on the first device detecting a radio link failure (RLF) for the RRC connection between the first base station and the first device, the information regarding the relay reselection is transmitted to the second device. ### Claim 15 (depends on 13) The first device of claim 13, wherein the relay reselection by the second device is triggered based on the information regarding the relay reselection. ### Claim 16 (depends on 13) The first device of claim 13, wherein the PC5 connection between the first device and the second device is released based on the information regarding the relay reselection. ### Claim 17 An apparatus configured to control a first user equipment (UE), the apparatus comprising: one or more processors; and one or more memories operably connected to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: establish a radio resource control (RRC) connection with a first base station; establish a PC5 connection with a second UE; receive an RRC reconfiguration message for handover from the first base station; establish an RRC connection with a second base station based on the RRC reconfiguration message; and based on (i) the first UE which is a relay UE relaying communication between the second UE and the first base station, and (ii) the first UE establishing the RRC connection with the second base station, transmit information regarding relay reselection to the second UE. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein, based on the first UE detecting a radio link failure (RLF) for the RRC connection between the first base station and the first UE, the information regarding the relay reselection is transmitted to the second UE. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein the relay reselection by the second UE is triggered based on the information regarding the relay reselection. ### Claim 20 (depends on 17) The apparatus of claim 17, wherein the PC5 connection between the first UE and the second UE is released based on the information regarding the relay reselection.