US 12,256,451 B2
UE and communication control method for controlling transmitting PDU session request message
Yudai Kawasaki, Osaka (JP); and Masafumi Aramoto, Osaka (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/599,902
Filed by SHARP KABUSHIKI KAISHA, Osaka (JP)
PCT Filed Apr. 1, 2020, PCT No. PCT/JP2020/015083
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/204097, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-070077 (JP), filed on Apr. 1, 2019.
Prior Publication US 2022/0201787 A1, Jun. 23, 2022
Int. Cl. H04W 76/18 (2018.01); H04W 84/04 (2009.01)
CPC H04W 76/18 (2018.02) [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 no Single Network Slice Selection Assistance information (S-NSSAI) and no Data Network Name (DNN) combination was provided during the PDU session establishment procedure,
wherein
the first information is a cause value indicating insufficient resources for specific slice and DNN,
the back-off timer is a timer for S-NSSAI based congestion control, and
in a case that the first information and second information indicating whether the back-off timer being associated with the no S-NSSAI and no DNN combination that the UE provided during the PDU session establishment procedure is applied in a registered Public Land Mobile Network (PLMN) or all PLMNs are included in the PDU session establishment reject message, another PDU session establishment request message or a PDU session modification request message for the same no S-NSSAI and no DNN combination is not sent in the registered PLMN or in the all PLMNs while the back-off timer is running, and
in a case that the back-off timer is deactivated and is associated with the no S-NSSAI and no DNN combination, neither a PDU session establishment procedure nor a PDU session modification procedure is allowed to be initiated.