# US 2021/0345139 A1 · Method and apparatus used in transmission reliability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0345139 A1 - Document ID: US20210345139A1 - Status: Published application - Kind: A1 - Application number: 17/284,292 - Filed: 2019-10-10 - Published: 2021-11-04 - Earliest claimed: 2018-10-10 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Jose Luis PRADAS; Nianshan SHI; Torsten DUDDA - Web page: https://patentgrep.com/patent/US20210345139A1 ## CPC - H04W 76/15: Setup of multiple wireless link connections - H04L 45/28: using route fault recovery - H04W 24/04: Arrangements for maintaining operational condition - H04W 36/00692: {using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] (allocation of physical resources in CoMP or in CA H04L5/0035)} - H04W 76/18: Management of setup rejection or failure - H04L 45/22: {Alternate routing} - H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)} - H04W 40/24: Connectivity information management, e.g. connectivity discovery or connectivity update - H04W 80/02: Data link layer protocols - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - 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 for transmission reliability comprises receiving, from a first network node at a second network node, a message indicating that a first connection between the first network node and a terminal device has failed. The message comprises an indication to initiate a second connection with the terminal device from the second network node. The method further comprises establishing, at the second network node, the second connection with the terminal device based on the message. The second network node comprises a third connection established before the first connection failed. The first connection carries data transmitted in the third connection before the first connection failed, and the second connection carries data transmitted in the third connection after the first connection failed. The method for interference coordination utilizes duplicated transmissions to secure data transmission and to prevent data loss in an unexpected system failure. ## Claims ### Claim 1 A method for transmission reliability, comprising: receiving, from a first network node at a second network node, a message indicating that a first connection between the first network node and a terminal device has failed, wherein the message comprises an indication to initiate a second connection with the terminal device from the second network node; and establishing, at the second network node, the second connection with the terminal device based on the message, wherein: the second network node comprises a third connection established before the first connection failed; the first connection carries data transmitted in the third connection before the first connection failed; and the second connection carries data transmitted in the third connection after the first connection failed. ### Claim 2 (depends on 1) The method according to claim 1, wherein at least two of the first connection, the second connection, and the third connection are provided via dual connectivity (DC). ### Claim 3 (depends on 2) The method according to claim 2, wherein the first network node is a secondary node, and the second network node is a master node. ### Claim 4 (depends on 3) The method according to claim 3, wherein the second network node performs carrier aggregation (CA) for packet data convergence protocol (PDCP) duplication. ### Claim 5 (depends on 3) The method according to claim 3, further comprising establishing a fourth connection between the second network node and a third network node. ### Claim 6 (depends on 2) The method according to claim 2, wherein the first network node is a master node, and the second network node is a secondary node. ### Claim 7 (depends on 6) The method according to claim 6, wherein the message further indicates the second network node to take over radio resource control (RRC). ### Claim 8 (depends on 2) The method according to claim 2, wherein the terminal device is configured to a CA configuration through a master cell group (MCG) when the failure of the first connection is a secondary cell group (SCG) failure. ### Claim 9 (depends on 1) The method according to claim 1, wherein the terminal device comprises a first user equipment (UE) and a second UE. ### Claim 10 (depends on 9) The method according to claim 9, wherein the first connection is between the first UE of the terminal device and the first network node, and the second connection and the third connection are between the second UE of the terminal device and the second network node. ### Claim 11 A network node for transmission reliability, comprising: at least one processing circuitry; and at least one storage that stores processor-executable instructions, when executed by the processing circuitry, causes a network node to: receive, from a first network node, a message indicating that a first connection between the first network node and a terminal device has failed, wherein the message comprises an indication to initiate a second connection with the terminal device; and establish the second connection with the terminal device based on the message, wherein: the network node comprises a third connection established before the first connection failed; the first connection carries data transmitted in the third connection before the first connection failed; and the second connection carries data transmitted in the third connection after the first connection failed. ### Claim 12 (depends on 11) The network node according to claim 11, wherein at least two of the first connection, the second connection, and the third connection are provided via dual connectivity (DC). ### Claim 13 (depends on 12) The network node according to claim 12, wherein the first network node is a secondary node, and the network node is a master node. ### Claim 14 (depends on 13) The network node according to claim 13, wherein the instructions further cause the network node to perform carrier aggregation (CA) for packet data convergence protocol (PDCP) duplication. ### Claim 15 (depends on 13) The network node according to claim 13, wherein the instructions further cause the network node to establish a fourth connection with a second network node. ### Claim 16 (depends on 12) The network node according to claim 12, wherein the first network node is a master node, and the network node is a secondary node. ### Claim 17 (depends on 16) The network node according to claim 16, wherein the message further indicates the network node to take over radio resource control (RRC). ### Claim 18 (depends on 12) The network node according to claim 12, wherein the terminal device is configured to a CA configuration through a master cell group (MCG) when the failure of the first connection is a secondary cell group (SCG) failure. ### Claim 19 (depends on 11) The network node according to claim 11, wherein the terminal device comprises a first user equipment (UE) and a second UE. ### Claim 20 (depends on 19) The network node according to claim 19, wherein the first connection is between the first UE of the terminal device and the first network node, and the second connection and the third connection are between the second UE of the terminal device and the network node.