# US 12,004,012 B2 · Method and device used for duplicate data transmission > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,012 B2 - Document ID: US12004012B2 - Status: Granted - Kind: B2 - Application number: 17/377,980 - Filed: 2021-07-16 - Published: 2021-11-04 - Granted: 2024-06-04 - Earliest claimed: 2019-01-16 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Cong Shi - Web page: https://patentgrep.com/patent/US12004012B2 ## CPC - H04W 28/12: using signalling between network elements - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - 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 Disclosed by the present application is a method used for duplicate data transmission, which may implement effective duplicate data transmission in more than two duplicate data transmission mechanisms. The method comprises: a terminal device receiving first indication information; and the terminal device carrying out processing for a PDCP PDU according to the first indication information, the first indication information being used to indicate that a duplicate data transmission function of at least one PDCP entity is active or inactive and/or indicate an RLC entity used for transmitting duplicate data among a plurality of RLC entities associated with the at least one PDCP entity respectively. ## Claims ### Claim 1 A method used for duplicate data transmission, applied to a communication device, comprising: transmitting a first indication information; or, receiving the first indication information; wherein the first indication information is used to indicate that a duplicate data transmission function of at least one packet data convergence protocol (PDCP) entity is active or inactive, and/or indicate that a radio link control (RLC) entity used for transmitting duplicate data among a plurality of RLC entities associated with the at least one PDCP entity respectively; wherein the first indication information is carried in a media access control control element (MAC CE), the first indication information comprises one byte, the byte comprises a first field and a third field, and the first field comprises a data radio bearer (DRB) identifier (ID) corresponding to the PDCP entity. ### Claim 2 (depends on 1) The method according to claim 1, wherein the at least one PDCP entity comprises: a PDCP entity for duplicate data transmission based on a carrier aggregation (CA); and/or, a PDCP entity for duplicate data transmission based on a dual connectivity (DC). ### Claim 3 (depends on 1) The method according to claim 1, wherein the at least one PDCP entity comprises one PDCP entity, the first indication information further comprises a second field, the second field is used to indicate that the duplicate data transmission function of the PDCP entity is active or inactive, and the third field is used to indicate the RLC entity used for transmitting the duplicate data among the plurality of RLC entities associated with the PDCP entity. ### Claim 4 (depends on 1) The method according to claim 1, wherein the at least one PDCP entity comprises one PDCP entity, the first indication information does not comprise a second field, and the third field is used to indicate the RLC entity used for transmitting the duplicate data among the plurality of RLC entities associated with the PDCP entity and further used to indicate that the duplicate data transmission function of the PDCP entity is active or inactive. ### Claim 5 (depends on 3) The method according to claim 3, wherein the plurality of bits in the third field respectively correspond to the plurality of RLC entities associated with the PDCP entity, and each bit is used to indicate whether the RLC entity corresponding to each bit is used to transmit the duplicate data. ### Claim 6 (depends on 3) The method according to of claim 3, wherein the plurality of RLC entities associated with the PDCP entity for duplicate data transmission based on the dual connectivity correspond to the plurality of bits in the third field in sequence according to the order of the cell group to which the plurality of RLC entities belong. ### Claim 7 A communication device used for duplicate data transmission, comprising: a transmitter configured to transmit a first indication information; or, a receiver configured to receive the first indication information; wherein the first indication information is used to indicate that a duplicate data transmission function of at least one packet data convergence protocol (PDCP) entity is active or inactive, and/or indicate that a radio link control (RLC) entity used for transmitting duplicate data among a plurality of RLC entities associated with the at least one PDCP entity respectively; wherein the first indication information is carried in a media access control control element (MAC CE), the first indication information comprises one byte, the byte comprises a first field and a third field, and the first field comprises a data radio bearer (DRB) identifier (ID) corresponding to the PDCP entity. ### Claim 8 (depends on 7) The communication device according to claim 7, wherein the at least one PDCP entity comprises: a PDCP entity for duplicate data transmission based on a carrier aggregation (CA); and/or, a PDCP entity for duplicate data transmission based on a dual connectivity (DC). ### Claim 9 (depends on 7) The communication device according to claim 7, wherein the at least one PDCP entity comprises one PDCP entity, the first indication information further comprises a second field, the second field is used to indicate that the duplicate data transmission function of the PDCP entity is active or inactive, and the third field is used to indicate the RLC entity used for transmitting the duplicate data among the plurality of RLC entities associated with the PDCP entity. ### Claim 10 (depends on 7) The communication device according to claim 7, wherein the at least one PDCP entity comprises one PDCP entity, the first indication information does not comprise a second field, and the third field is used to indicate the RLC entity used for transmitting the duplicate data among the plurality of RLC entities associated with the PDCP entity and further used to indicate that the duplicate data transmission function of the PDCP entity is active or inactive. ### Claim 11 (depends on 9) The communication device according to claim 9, wherein the plurality of bits in the third field respectively correspond to the plurality of RLC entities associated with the PDCP entity, and each bit is used to indicate whether the RLC entity corresponding to each bit is used to transmit the duplicate data. ### Claim 12 (depends on 9) The communication device according to claim 9, wherein the plurality of RLC entities associated with the PDCP entity for duplicate data transmission based on the dual connectivity correspond to the plurality of bits in the third field in sequence according to the order of the cell group to which the plurality of RLC entities belong. ### Claim 13 A terminal device, comprising: a receiver configured to receive first indication information; and a processor configured to carry out processing for a packet data convergence protocol (PDCP) protocol data unit (PDU) according to the first indication information; wherein the first indication information is used to indicate that a duplicate data transmission function of at least one PDCP entity is active or inactive and/or indicate a radio link control (RLC) entity used for transmitting duplicate data among a plurality of RLC entities associated with the at least one PDCP entity respectively; wherein the first indication information is carried in a media access control control element (MAC CE), the first indication information comprises one byte, the byte comprises a first field and a third field, and the first field comprises a data radio bearer (DRB) identifier (ID) corresponding to the PDCP entity. ### Claim 14 (depends on 13) The terminal device according to claim 13, wherein the at least one PDCP entity comprises: a PDCP entity for duplicate data transmission based on a carrier aggregation (CA); and/or, a PDCP entity for duplicate data transmission based on a dual connectivity (DC). ### Claim 15 (depends on 13) The terminal device according to claim 13, wherein the at least one PDCP entity comprises one PDCP entity, the first indication information further comprises a second field, the second field is used to indicate that the duplicate data transmission function of the PDCP entity is active or inactive, and the third field is used to indicate the RLC entity used for transmitting the duplicate data among the plurality of RLC entities associated with the PDCP entity. ### Claim 16 (depends on 13) The terminal device according to claim 13, wherein the at least one PDCP entity comprises one PDCP entity, the first indication information does not comprise a second field, and the third field is used to indicate the RLC entity used for transmitting the duplicate data among the plurality of RLC entities associated with the PDCP entity and further used to indicate that the duplicate data transmission function of the PDCP entity is active or inactive. ### Claim 17 (depends on 15) The terminal device according to claim 15, wherein the plurality of bits in the third field respectively correspond to the plurality of RLC entities associated with the PDCP entity, and each bit is used to indicate whether the RLC entity corresponding to each bit is used to transmit the duplicate data.