US 12,232,209 B2
Method and apparatus for head compression in SDT operation for a terminal in wireless mobile communication system
Soenghun Kim, Gyeonggi-do (KR)
Assigned to Blackpin Inc., Seoul (KR); and Soenghun Kim, Hanam-si (KR)
Filed by BLACKPIN INC., Seoul (KR); and Soenghun Kim, Gyeonggi-do (KR)
Filed on Apr. 21, 2023, as Appl. No. 18/137,440.
Claims priority of application No. 10-2022-0057691 (KR), filed on May 11, 2022.
Prior Publication US 2023/0371120 A1, Nov. 16, 2023
Int. Cl. H04W 76/30 (2018.01); H04W 28/06 (2009.01); H04W 76/20 (2018.01)
CPC H04W 76/30 (2018.02) [H04W 28/06 (2013.01); H04W 76/20 (2018.02)] 2 Claims
OG exemplary drawing
 
1. A method by a terminal in a wireless communication system, the method comprising:
receiving a RRCRelease, wherein the RRCRelease comprises first information for small data transmission (SDT), wherein the first information comprises a signaling radio bearer2 (SRB2) indicator and a data radio bearer (DRB) list;
determining one or more radio bearers configured for SDT based on the first information;
discarding all stored Packet Data Convergence Protocol (PDCP) Service Data Unit (SDU) and PDCP Protocol Data Unit (PDU) in a PDCP entity of SRB1;
discarding all stored PDCP SDU and PDCP PDU in a PDCP entity of SRB2 in case that the SRB2 indicator is comprised in the first information;
storing Ethernet Header Compression (EHC) information in User Equipment (UE) INACTIVE Access Stratum (AS) context;
receiving a SystemInformationBlock1, wherein the SystemInformationBlock1 comprises second information for SDT, wherein the second information comprises a first threshold value and a second threshold value, wherein the first threshold value is related to a reference signal received power and the second threshold value is related to data volume;
initiating SDT based on the first information and the second information;
reestablishing the PDCP entity of the SRB1 and resuming the SRB1, wherein the terminal restores EHC information stored in UE INACTIVE AS context before reestablishing the PDCP entity of the SRB1 and after initiating the SDT;
restoring PDCP configurations of the radio bearers configured for SDT in UE INACTIVE AS context; and
resuming the radio bearers.