US 12,156,021 B2
UE and communication control method for controlling transmission of PDU session request message
Yudai Kawasaki, Sakai (JP); and Masafumi Aramoto, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/600,081
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Apr. 1, 2020, PCT No. PCT/JP2020/015077
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/204094, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-070074 (JP), filed on Apr. 1, 2019.
Prior Publication US 2022/0191734 A1, Jun. 16, 2022
Int. Cl. H04W 28/02 (2009.01); H04W 48/18 (2009.01); H04W 84/04 (2009.01)
CPC H04W 28/0289 (2013.01) [H04W 48/18 (2013.01); H04W 84/042 (2013.01)] 3 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 a 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,
the back-off timer is associated with the S-NSSAI that the UE provided during the PDU session establishment procedure, and
in a case that the first information and second information indicating that the back-off timer is applied in all Public Land Mobile Network (PLMN)s are included in the PDU session establishment reject message, another PDU session establishment request message or a PDU session modification request message for the S-NSSAI is not sent in all PLMNs while the back-off timer is running.