US 12,256,356 B2
User equipment (UE)
Yasuo Sugawara, Sakai (JP); and Yudai Kawasaki, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Appl. No. 17/788,657
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
PCT Filed Dec. 24, 2020, PCT No. PCT/JP2020/048538
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/132505, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-238127 (JP), filed on Dec. 27, 2019.
Prior Publication US 2022/0377693 A1, Nov. 24, 2022
Int. Cl. H04W 60/00 (2009.01); H04W 76/10 (2018.01)
CPC H04W 60/00 (2013.01) [H04W 76/10 (2018.02)] 6 Claims
OG exemplary drawing
 
1. A User Equipment (UE) comprising:
transmission and reception circuitry;
control circuitry; and
a storage,
wherein
the transmission and reception circuitry is configured to:
transmit a registration request message including a requested Network Slice Selection Assistance Information (NSSAI); and
receive a registration reject message including a 5GS Mobility Management (5GMM) cause value indicating that no network slices are available, a rejected NSSAI including a Single Network Slice Selection Assistance Information (S-NSSAI) for which a maximum number of UEs reached, a cause value indicating that the S-NSSAI is not available due to the maximum number of UEs reached, and a back-off timer value for the S-NSSAI, and the control circuitry is configured to:
store the S-NSSAI in a rejected NSSAI for the maximum number of UEs reached in the storage;
start a timer with the back-off timer value for the S-NSSAI; and
remove the S-NSSAI from the rejected NSSAI for the maximum number of UEs reached that is stored in the storage in a case that the timer expires.