# US 12,225,612 B2 · Dual connection re-establishment method, readable storage medium, and base station > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,612 B2 - Document ID: US12225612B2 - Status: Granted - Kind: B2 - Application number: 17/776,128 - Filed: 2020-10-29 - Published: 2022-09-22 - Granted: 2025-02-11 - Earliest claimed: 2019-11-13 - Assignees: Zte Corporation - Applicants: ZTE Corporation - Inventors: Juntao Wang; Gaopeng Du; Xueying Huang; Wei Si; Rui Liu - Web page: https://patentgrep.com/patent/US12225612B2 ## CPC - H04W 76/19: Connection re-establishment - H04W 76/15: Setup of multiple wireless link connections - H04W 76/20: Manipulation of established connections - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A dual connection re-establishment method, a non-transitory computer-readable storage medium, and a node are disclosed. The dual connection re-establishment method may include: sending a configuration information request to a target secondary node (SN) in response to a RRC connection re-establishment completion instruction sent by a UE (S1); receiving first configuration information fed back by the target SN (S2); and sending the first configuration information, and second configuration information corresponding to the MN to the UE for the UE to complete the RRC connection reconfiguration with the MN and the target SN according to the first configuration information and the second configuration information (S3). ## Claims ### Claim 1 A dual connection re-establishment method, which is applied to a master node (MN) side, the method comprising: sending a configuration information request to a target secondary node (SN) in response to a radio resource control (RRC) connection re-establishment completion instruction sent by a user equipment (UE); receiving first configuration information fed back by the target SN; and sending the first configuration information, and second configuration information corresponding to the MN to the UE for the UE to complete the RRC connection reconfiguration with the MN and the target SN according to the first configuration information and the second configuration information; prior to sending a configuration information request to a target SN, the method further comprising: determining a source SN to which the UE was connected previously as the target SN in response to the UE not needing to switch the SN; wherein in response to the source SN being determined as the target SN, sending a configuration information request to a target SN comprises: sending the configuration information request and a first instance maintenance request to the target SN for the target SN to feed back the first configuration information and maintain a UE instance. ### Claim 2 (depends on 1) The method of claim 1, wherein: the configuration information request is sent in a SN modification request instruction; or the configuration information request is sent in a SN addition request instruction. ### Claim 3 (depends on 1) The method of claim 1, wherein the first configuration information and the second configuration information are sent in an RRC connection reconfiguration instruction. ### Claim 4 (depends on 1) The method of claim 1, wherein the first instance maintenance request is sent in the SN modification request instruction. ### Claim 5 (depends on 1) The method of claim 1, wherein: in response to the source SN being determined as the target SN, sending a configuration information request to a target SN comprises: sending the configuration information request and a resource maintenance request to the target SN for the target SN to feed back the first configuration information and maintain a UE resource; and prior to sending the first configuration information, and second configuration information corresponding to the MN to the UE, the method further comprises: sending a second instance maintenance request to the UE for the UE to maintain a source SN instance. ### Claim 6 (depends on 5) The method of claim 5, wherein the resource maintenance request is sent in the SN modification request instruction. ### Claim 7 (depends on 1) The method of claim 1, prior to sending a configuration information request to a target SN, the method further comprising: receiving an RRC connection re-establishment request instruction sent by the UE; and feeding back an RRC connection re-establishment instruction to the UE for the UE to complete RRC connection re-establishment with the MN. ### Claim 8 (depends on 7) The method of claim 7, after receiving an RRC connection re-establishment request instruction sent by the UE and prior to feeding back an RRC connection re-establishment instruction to the UE, the method further comprising: acquiring context information of the UE from a source MN to which the UE was connected previously in response to the UE needing to switch the MN. ### Claim 9 (depends on 1) A non-transitory computer-readable storage medium storing a program which, when executed by a processor, causes the processor to carry out the method of claim 1. ### Claim 10 A node, comprising: one or more processors; a memory storing one or more programs; wherein the one or more programs, when executed by the one or more processors, cause the one or more processors to carry out a dual connection re-establishment method, which is applied to a master node (MN) side, the method comprising: sending a configuration information request to a target secondary node (SN) in response to a radio resource control (RRC) connection re-establishment completion instruction sent by a user equipment (UE); receiving first configuration information fed back by the target SN; and sending the first configuration information, and second configuration information corresponding to the MN to the UE for the UE to complete the RRC connection reconfiguration with the MN and the target SN according to the first configuration information and the second configuration information; prior to sending a configuration information request to a target SN, the method further comprising: determining a source SN to which the UE was connected previously as the target SN in response to the UE not needing to switch the SN; wherein in response to the source SN being determined as the target SN, sending a configuration information request to a target SN comprises: sending the configuration information request and a first instance maintenance request to the target SN for the target SN to feed back the first configuration information and maintain a UE instance. ### Claim 11 A dual connection re-establishment method, which is applied to a UE side, the method comprising: sending a radio resource control (RRC) connection re-establishment completion instruction to a master node (MN) for the MN to send a configuration information request to a target secondary node (SN) and receive first configuration information fed back by the target SN; receiving the first configuration information sent by the MN and second configuration information corresponding to the MN; and completing RRC connection reconfiguration with the MN and the target SN according to the first configuration information and the second configuration information; prior to sending a configuration information request to a target SN, the method further comprising: determining a source SN to which the UE was connected previously as the target SN in response to the UE not needing to switch the SN; wherein in response to the source SN being determined as the target SN, sending a configuration information request to a target SN comprises: sending the configuration information request and a first instance maintenance request to the target SN for the target SN to feed back the first configuration information and maintain a UE instance. ### Claim 12 (depends on 11) A non-transitory computer-readable storage medium storing a program which, when executed by a processor, causes the processor to carry out the method of claim 11.