	US 12,021,641 B2
	Data retransmission indication and processing method and device
Zhuang Liu, Shenzhen (CN); Yin Gao, Shenzhen (CN); and Dapeng Li, Shenzhen (CN)
Assigned to ZTE CORPORATION, Shenzhen (CN)
Appl. No. 17/415,982
Filed by ZTE Corporation, Shenzhen (CN)
PCT Filed Dec. 20, 2019, PCT No. PCT/CN2019/126954 § 371(c)(1), (2) Date Jun. 18, 2021, PCT Pub. No. WO2020/135251, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 201811585254.9 (CN), filed on Dec. 24, 2018.
Prior Publication US 2021/0385031 A1, Dec. 9, 2021
Int. Cl. H04L 1/1867 (2023.01); H04L 1/1829 (2023.01); H04W 28/06 (2009.01); H04W 76/12 (2018.01)

CPC H04L 1/1896 (2013.01) [H04L 1/1835 (2013.01); H04L 1/1874 (2013.01); H04W 28/06 (2013.01); H04W 76/12 (2018.02)]

19 Claims

1. A data retransmission indication method, comprising, sending, by a first network element, a retransmission indication message to a retransmission network element, the retransmission indication message being used to instruct the retransmission network element to retransmit segment data of a Packet Data Convergence Protocol (PDCP) Protocol Data Unit (PDU), wherein the first network element has failed to transmit the segment data to a terminal, when receiving a first retransmission indication response message returned by the retransmission network element, encapsulating, by the first network element, Radio Link Control (RLC) PDU data corresponding to segment data of a PDCP PDU which has been failed to transmit into format-specified data, and sending the data to the retransmission network element; or, when receiving a first retransmission indication response message returned by the retransmission network element, encapsulating, by the first network element, RLC PDU data in a sending buffer and a receiving buffer in an RLC entity into format-specified data, and sending the data to the retransmission network element, wherein the first retransmission indication response message is used to indicate that the first retransmission indication message lacks the segment data of the PDCP PDU which has been failed to transmit or the segment data of the PDCP PDU which has been failed to transmit is incomplete.