US 12,245,307 B2
Control method in user equipment and user equipment
Ningjuan Chang, Shanghai (CN); and Renmao Liu, Shanghai (CN)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/053,599
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed May 7, 2019, PCT No. PCT/CN2019/085832
§ 371(c)(1), (2) Date Nov. 6, 2020,
PCT Pub. No. WO2019/214606, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 201810440467.6 (CN), filed on May 9, 2018.
Prior Publication US 2021/0235531 A1, Jul. 29, 2021
Int. Cl. H04W 76/25 (2018.01); H04W 8/08 (2009.01); H04W 60/04 (2009.01); H04W 76/19 (2018.01); H04W 80/02 (2009.01)
CPC H04W 76/19 (2018.02) [H04W 8/08 (2013.01); H04W 60/04 (2013.01); H04W 76/25 (2018.02); H04W 80/02 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A User Equipment (UE), comprising:
a processor; and
a memory, wherein the memory stores instructions that, when executed by the processor, cause the UE to:
transmit a Radio Resource Control (RRC) connection reestablishment request message;
receive an RRC connection setup message in response to the RRC connection reestablishment request message, the RRC connection setup message being used to instruct the UE to establish a new RRC connection;
when an RRC layer of the UE receives the RRC connection setup message:
release radio resources including associated Radio Link Control (RLC) entities, Packet Data Convergence Protocol (PDCP) entities, and Service Data Adaptation Protocol (SDAP) for all established radio bearers which do not include a Signaling Radio Bearer 0 (SRB0),
indicate, by the RRC layer, an RRC connection reestablishment fallback indication to a Non-Access Stratum (NAS) layer of the UE,
apply configurations included in the RRC connection setup message, the configurations including master cell group configurations and radio bearer configuration, and
submit an RRC connection setup complete message to a lower layer for transmission; and
when the NAS layer receives the RRC connection reestablishment fallback indication from the RRC layer:
enter into a 5G system Mobility Management idle (5GMM-IDLE) mode, and
initiate a registration update procedure or a service request procedure.