# US 12,224,869 B2 · Duplication and RLC operation in new radio access technology > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,869 B2 - Document ID: US12224869B2 - Status: Granted - Kind: B2 - Application number: 17/214,556 - Filed: 2021-03-26 - Published: 2021-07-15 - Granted: 2025-02-11 - Earliest claimed: 2017-03-13 - Assignees: Nokia Technologies Oy - Applicants: Nokia Technologies Oy - Inventors: Guillaume Decarreau; Benoist Sebire - Web page: https://patentgrep.com/patent/US12224869B2 ## CPC - H04L 1/1848: {Time-out mechanisms} - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 69/40: for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection (management of faults, events, alarms or notifications in data switching networks H04L41/06) - H04W 28/04: Error control - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04W 80/08: Upper layer protocols {(network arrangements or communication protocols for networked applications H04L67/00)} - H04W 80/02: Data link layer protocols - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract In accordance with example embodiments as described herein there is at least an apparatus and method to perform transmitting packet data convergence protocol data unit duplicates over two or more carriers; receiving an indication that indicates packet data convergence protocol data unit has been correctly transmitted via one of two or more carriers; and upon receiving the indication, instructing to discard other packet data convergence protocol duplicates over carriers other than the one of two or more carriers with a successful delivery. ## Claims ### Claim 1 A mobile device comprising: at least one processor; and at least one memory storing instructions thereon that, when executed by the at least one processor, cause the mobile device to perform at least: instructing to transmit, over two or more carriers, a packet data convergence protocol (PDCP) protocol data unit (PDU) and a PDCP PDU duplicate, wherein the PDCP PDU and the PDCP PDU duplicate are used for uplink transmissions by the mobile device; receiving an indication, from a radio link control (RLC) entity, that one of the PDCP PDU or the PDCP PDU duplicate has been successfully delivered via one of the two or more carriers as confirmed by the RLC entity; and in response to receiving the indication, instructing to discard the other one of the PDCP PDU or the PDCP PDU duplicate over at least one carrier other than the one of two or more carriers with successful delivery as confirmed by the RLC entity. ### Claim 2 (depends on 1) The mobile device of claim 1, wherein the instructing to discard the other of the PDCP PDU or the PDCP PDU duplicate comprises informing a corresponding RLC entity not to transmit the other of the PDCP PDU or the PDCP PDU duplicate. ### Claim 3 (depends on 1) The mobile device of claim 1, wherein the instructions stored on the at least one memory, when executed by the at least one processor, further cause the mobile device to perform: detecting a radio link failure at a bearer for retransmission of a PDCP PDU duplicate; and based on duplication of the PDCP PDU taking place, causing the radio link failure to not be allowed to be triggered upon a number of PDCP PDU retransmissions reaching a maximum number of PDCP PDU retransmissions or a threshold number of PDCP PDU retransmissions that is predetermined or is provided by a communication network. ### Claim 4 (depends on 1) The mobile device of claim 1, wherein the indication is signaled per PDCP PDU or per radio bearer. ### Claim 5 (depends on 1) The mobile device of claim 1, wherein the indication indicates which PDCP PDU is a duplicate. ### Claim 6 A method comprising: instructing, by a mobile device, to transmit a packet data convergence protocol (PDCP) protocol data unit (PDU) and a PDCP PDU duplicate for uplink transmissions over two or more carriers; receiving an indication, from a radio link control (RLC) entity, that one of the PDCP PDU or the PDCP PDU duplicate has been successfully delivered via one of the two or more carriers as confirmed by the RLC entity; and in response to receiving the indication, instructing to discard the other one of the PDCP PDU or the PDCP PDU duplicate over at least one carrier other than the one of two or more carriers with successful delivery as confirmed by the RLC entity. ### Claim 7 (depends on 6) The method of claim 6, wherein instructing to discard the other one of the PDCP PDU or the PDCP PDU duplicate comprises informing a corresponding RLC entity not to transmit the other one of the PDCP PDU or the PDCP PDU duplicate. ### Claim 8 (depends on 6) The method of claim 6, wherein the indication is signaled per PDCP PDU or per radio bearer. ### Claim 9 (depends on 6) The method of claim 6, wherein the indication indicates which PDCP PDU is a duplicate. ### Claim 10 (depends on 6) The method of claim 6, further comprising: detecting a radio link failure at a bearer for retransmission of a PDCP PDU duplicate; and based on duplication of the PDCP PDU taking place, causing the radio link failure to not be allowed to be triggered upon a number of PDCP PDU retransmissions reaching a maximum number of PDCP PDU retransmissions or a threshold number of PDCP PDU retransmissions that is predetermined or is provided by a communication network. ### Claim 11 A non-transitory computer-readable storage medium comprising instructions thereon that, when executed by at least one processor, cause a mobile device to perform at least: instructing to transmit, over two or more carriers, a packet data convergence protocol (PDCP) protocol data unit (PDU) and a PDCP PDU duplicate; receiving an indication, from a radio link control (RLC) entity, that one of the PDCP PDU or the PDCP PDU duplicate has been successfully delivered via one of the two or more carriers as confirmed by the RLC entity; and in response to receiving the indication, instructing to discard the other one of the PDCP PDU or the PDCP PDU duplicate over at least one carrier other than the one of two or more carriers with successful delivery as confirmed by the RLC entity. ### Claim 12 (depends on 11) The non-transitory computer-readable storage medium of claim 11, wherein the instructing to discard the other one of the PDCP PDU or the PDCP PDU duplicate comprises informing a corresponding RLC entity not to transmit the other one of the PDCP PDU or the PDCP PDU duplicate. ### Claim 13 (depends on 11) The non-transitory computer-readable storage medium of claim 11, wherein the indication is received per PDCP PDU or per radio bearer. ### Claim 14 (depends on 11) The non-transitory computer-readable storage medium of claim 11, wherein the instructions stored thereon, when executed by the at least one processor, further cause the mobile device to perform: detecting a radio link failure at a bearer for retransmission of a PDCP PDU duplicate; and based on duplication of the PDCP PDU taking place, causing the radio link failure to not be allowed to be triggered upon a number of PDCP PDU retransmissions reaching a maximum number of PDCP PDU retransmissions or a threshold number of PDCP PDU retransmissions that is predetermined or is provided by a communication network. ### Claim 15 (depends on 11) The non-transitory computer-readable storage medium of claim 11, wherein the indication indicates which PDCP PDU is the duplicate.