US 12,170,889 B2
UE and communication control method
Yudai Kawasaki, Sakai (JP); and Masafumi Aramoto, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/600,083
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Apr. 1, 2020, PCT No. PCT/JP2020/015079
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/204095, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-070075 (JP), filed on Apr. 1, 2019.
Prior Publication US 2022/0201549 A1, Jun. 23, 2022
Int. Cl. H04W 28/02 (2009.01); H04W 48/06 (2009.01); H04W 48/18 (2009.01); H04W 60/04 (2009.01); H04W 76/18 (2018.01); H04W 84/04 (2009.01)
CPC H04W 28/0289 (2013.01) [H04W 48/18 (2013.01); H04W 84/042 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A User Equipment (UE) comprising:
transmission and reception circuitry configured to receive, from a control device, a Protocol Data Unit (PDU) session establishment reject message in a PDU session establishment procedure; and
a controller configured to start a back-off timer with a back-off timer value in a case that first information and the back-off timer value are included in the PDU session establishment reject message, and in a case that no Single Network Slice Selection Assistance information (S-NSSAI) was provided during the PDU session establishment procedure,
wherein
the first information is a cause value indicating insufficient resources for specific slice,
the back-off timer is a timer for S-NSSAI based congestion control,
when the no S-NSSAI is provided by the UE along with a PDU session establishment request message, the back-off timer is associated with the no S-NSSAI,
in a case that the first information and second information, indicating that the back-off timer is applied in a registered Public Land Mobile Network (PLMN), are included in the PDU session establishment reject message, another PDU session establishment request message or a PDU session modification request message for the no S-NSSAI is not sent in the registered PLMN while the back-off timer is running, and
in a case that the back-off timer is running and is associated with the no S-NSSAI, neither a PDU session establishment procedure nor a PDU session modification procedure is allowed to initiate.