# US 2021/0242971 A1 · Data transmission and measurement techniques > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242971 A1 - Document ID: US20210242971A1 - Status: Published application - Kind: A1 - Application number: 17/239,129 - Filed: 2021-04-23 - Published: 2021-08-05 - Earliest claimed: 2018-11-02 - Assignees: Zte Corporation - Applicants: ZTE Corporation - Inventors: Zhuang LIU; Yin GAO - Web page: https://patentgrep.com/patent/US20210242971A1 ## CPC - H04L 1/1621: {Group acknowledgement, i.e. the acknowledgement message defining a range of identifiers, e.g. of sequence numbers} - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 1/18: Automatic repetition systems, e.g. Van Duuren systems - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods, systems, and devices related to related to digital wireless communication, and more specifically, to techniques related to transmitting data and feedback data between network elements is disclosed. In one exemplary aspect, a method for wireless communication includes transmitting data from a first network element to a second network element. The method also includes receiving, at the first network element, feedback data from the second network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal. The method also includes retransmitting at least a portion of the data from the first network element based on the feedback data. ## Claims ### Claim 1 A method for wireless communication, comprising: transmitting data from a first network element to a second network element; receiving, at the first network element, feedback data from the second network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal; and retransmitting at least a portion of the data from the first network element based on the feedback data. ### Claim 2 (depends on 1) The method of claim 1, where the information indicative of the range of data that has been successfully delivered to the terminal includes a highest reported new radio user plane data (NR-U) SN successfully delivered to the terminal. ### Claim 3 (depends on 2) The method of claim 2, where the information indicative of the range of data that has been successfully delivered to the terminal includes a PDCP SN encapsulated within a NR-U packet data unit (PDU) and associated with a NR-U SN, where the highest reported NR-U SN is less than or equal to the NR-U SN associated with the PDCP SN. ### Claim 4 (depends on 1) The method of claim 1, where the information indicative of the range of data that has been successfully delivered to the terminal includes start and end of an PDU NR-U SN set indicating whether the data in the set belongs to the feedback data to identify multiple PDCPs. ### Claim 5 (depends on 2) The method of claim 2, further including: determining whether all PDCP SN transmitted by the first network element are less than or equal to the highest delivered PDCP SN in the feedback data; and determining whether all NR-U SN transmitted by the first network element are less than or equal to the highest reported NR-U SN in the feedback data, where all transmitted data is successfully delivered to the terminal based on determining that all transmitted PDCP SN are less than or equal to the highest delivered PDCP SN and all transmitted NR-U SN are less than or equal to the highest reported NR-U SN. ### Claim 6 A method for wireless communication, comprising: receiving, at a second network element, data from a first network element; transmitting, at the second network element, feedback data to the first network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal; and receiving at least a portion of data retransmitted from the first network element based on the feedback data. ### Claim 7 (depends on 6) The method of claim 6, where the information indicative of the range of data that has been successfully delivered to the terminal includes at least one highest reported new radio user plane data (NR-U) SN successfully delivered to the terminal. ### Claim 8 (depends on 7) The method of claim 7, where the information indicative of the range of data that has been successfully delivered to the terminal includes a PDCP SN encapsulated within a NR-U packet data unit (PDU) associated with the NR-U SN, where the highest reported NR-U SN is less than or equal to the NR-U SN associated with the PDCP SN. ### Claim 9 (depends on 6) The method of claim 6, where the information indicative of the range of data that has been successfully delivered to the terminal indicates start and end of an PDU NR-U SN set indicating whether the data in the set belongs to the feedback data to identify multiple PDCPs. ### Claim 10 (depends on 7) The method of claims 7, further including: determining whether all PDCP SN transmitted by the first network element are less than or equal to the highest delivered PDCP SN in the feedback data; and determining whether all NR-U SN transmitted by the first network element are less than or equal to the highest reported NR-U SN in the feedback data, where all transmitted data is successfully delivered to the terminal based on determining that all transmitted PDCP SN are less than or equal to the highest delivered PDCP SN and all transmitted NR-U SN are less than or equal to the highest reported NR-U SN. ### Claim 11 An apparatus for wireless communication comprising a processor that is configured to perform a method, the processor being configured to: transmit data from a first network element to a second network element; receive, at the first network element, feedback data from the second network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal; and retransmit at least a portion of the data from the first network element based on the feedback data. ### Claim 12 (depends on 11) The apparatus of claim 11, where the information indicative of the range of data that has been successfully delivered to the terminal includes a highest reported new radio user plane data (NR-U) SN successfully delivered to the terminal. ### Claim 13 (depends on 12) The apparatus of claim 12, where the information indicative of the range of data that has been successfully delivered to the terminal includes a PDCP SN encapsulated within a NR-U packet data unit (PDU) and associated with a NR-U SN, where the highest reported NR-U SN is less than or equal to the NR-U SN associated with the PDCP SN. ### Claim 14 (depends on 11) The apparatus of claim 11, where the information indicative of the range of data that has been successfully delivered to the terminal includes start and end of an PDU NR-U SN set indicating whether the data in the set belongs to the feedback data to identify multiple PDCPs. ### Claim 15 (depends on 12) The apparatus of claim 12, wherein the processor is further configured to: determine whether all PDCP SN transmitted by the first network element are less than or equal to the highest delivered PDCP SN in the feedback data; and determine whether all NR-U SN transmitted by the first network element are less than or equal to the highest reported NR-U SN in the feedback data, where all transmitted data is successfully delivered to the terminal based on a determination that all transmitted PDCP SN are less than or equal to the highest delivered PDCP SN and all transmitted NR-U SN are less than or equal to the highest reported NR-U SN. ### Claim 16 An apparatus for wireless communication comprising a processor that is configured to perform a method, the processor being configured to: receive, at a second network element, data from a first network element; transmit, at the second network element, feedback data to the first network element, where the feedback data includes a highest delivered packet data convergence protocol (PDCP) sequence number (SN) and information indicative of a range of data that has been successfully delivered to a terminal; and receive at least a portion of data retransmitted from the first network element based on the feedback data. ### Claim 17 (depends on 16) The apparatus of claim 16, where the information indicative of the range of data that has been successfully delivered to the terminal includes at least one highest reported new radio user plane data (NR-U) SN successfully delivered to the terminal. ### Claim 18 (depends on 17) The apparatus of claim 17, where the information indicative of the range of data that has been successfully delivered to the terminal includes a PDCP SN encapsulated within a NR-U packet data unit (PDU) associated with the NR-U SN, where the highest reported NR-U SN is less than or equal to the NR-U SN associated with the PDCP SN. ### Claim 19 (depends on 16) The apparatus of claim 16, where the information indicative of the range of data that has been successfully delivered to the terminal indicates start and end of an PDU NR-U SN set indicating whether the data in the set belongs to the feedback data to identify multiple PDCPs. ### Claim 20 (depends on 17) The apparatus of claims 17, wherein the processor is further configured to: determine whether all PDCP SN transmitted by the first network element are less than or equal to the highest delivered PDCP SN in the feedback data; and determine whether all NR-U SN transmitted by the first network element are less than or equal to the highest reported NR-U SN in the feedback data, where all transmitted data is successfully delivered to the terminal based on a determination that all transmitted PDCP SN are less than or equal to the highest delivered PDCP SN and all transmitted NR-U SN are less than or equal to the highest reported NR-U SN.