US 11,729,685 B2
Method and device for transmitting data in case of PDCP version change in wireless communication system
Seungbo Ryu, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Appl. No. 16/978,167
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
PCT Filed Mar. 7, 2019, PCT No. PCT/KR2019/002641
§ 371(c)(1), (2) Date Sep. 3, 2020,
PCT Pub. No. WO2019/172669, PCT Pub. Date Sep. 12, 2019.
Claims priority of application No. 10-2018-0026700 (KR), filed on Mar. 7, 2018.
Prior Publication US 2021/0045029 A1, Feb. 11, 2021
Int. Cl. H04L 1/18 (2023.01); H04W 36/12 (2009.01); H04W 84/04 (2009.01)
CPC H04W 36/12 (2013.01) [H04L 1/18 (2013.01); H04W 84/042 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method performed by a first communication device in a wireless communication system, the method comprising:
identifying whether a change event of a packet data convergence protocol (PDCP) version occurred;
in case that the change event occurred, receiving, from a second communication device, first PDCP data that is buffered in a second PDCP entity of the second communication device and mapping information between a sequence number (SN) for the first PDCP data and an SN for a general packet radio service tunneling protocol (GTP), wherein the SN for the first PDCP data is detached in the first PDCP data, and wherein a downlink transmission of PDCP packet data units (PDUs) from the second PDCP entity of the second communication device to a radio link control (RLC) entity of the second communication device is stopped in case that the change event occurred;
receiving, from a terminal, a PDCP status report including acknowledgement/negative-acknowledgement (ACK/NACK) information on the first PDCP data;
identifying second PDCP data among the first PDCP data based on the PDCP status report and the mapping information, wherein the second PDCP data includes at least one PDCP PDU that has not been transmitted from the second PDCP entity to the RLC entity of the second communication device in case that the at least one PDCP PDU exists;
determining the second PDCP data by excluding data for which an ACK is sequentially received through an RLC automatic repeat request (ARQ) from the first PDCP data in case that a data transmission mode of the first communication device is a first acknowledged mode (AM mode);
allocating an SN for the second PDCP data; and
transmitting, to the terminal, the second PDCP data.