US 12,256,266 B2
Methods and apparatuses for transmitting and receiving data in wireless communication system
Donggun Kim, Suwon-si (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jan. 21, 2022, as Appl. No. 17/581,156.
Application 17/581,156 is a continuation of application No. 16/578,956, filed on Sep. 23, 2019, granted, now 11,265,759.
Claims priority of application No. 10-2018-0114324 (KR), filed on Sep. 21, 2018.
Prior Publication US 2022/0167210 A1, May 26, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 28/06 (2009.01); H04W 12/03 (2021.01); H04W 12/106 (2021.01); H04W 76/27 (2018.01); H04W 76/30 (2018.01); H04W 80/08 (2009.01)
CPC H04W 28/06 (2013.01) [H04W 12/03 (2021.01); H04W 12/106 (2021.01); H04W 76/27 (2018.02); H04W 76/30 (2018.02); H04W 80/08 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method, performed by a packet data convergence protocol (PDCP) entity of a user equipment (UE), of deciphering data in a wireless communication system, the method comprising:
receiving a first PDCP data packet data unit (PDU);
identifying an RCVD_COUNT of the first PDCP data PDU;
identifying whether integrity protection is configured;
in case that the integrity protection is configured, performing deciphering of the first PDCP data PDU using the RCVD_COUNT, performing integrity verification of the deciphered first PDCP data PDU, discarding the deciphered first PDCP data PDU in case that the integrity verification of the deciphered first PDCP data PDU fails, and discarding the deciphered first PDCP data PDU in case that the RCVD_COUNT is smaller than an RX_DELIV or in case that a second PDCP data PDU corresponding to the RCVD_COUNT is received before receiving the first PDCP data PDU; and
in case that the integrity protection is not configured, discarding the first PDCP data PDU in case that the RCVD_COUNT is smaller than the RX_DELIV or in case that the second PDCP data PDU corresponding to the RCVD_COUNT is received before receiving the first PDCP data PDU, and performing deciphering of the first PDCP data PDU using the RCVD_COUNT in case that the first PDCP data PDU is not discarded based on the RCVD_COUNT not being smaller than the RX_DELIV and the second PDCP data PDU corresponding to the RCVD_COUNT not being received before receiving the first PDCP data PDU,
wherein the RCVD_COUNT is a count value of the first PDCP data PDU, and
wherein the RX_DELIV is a count value of a first PDCP service data unit (SDU) not delivered to an upper layer of the PDCP entity.