US 12,137,493 B2
Method and apparatus for handling non-IP data network connectivity and restrictions
Jennifer J-N Liu, Plano, TX (US)
Assigned to NOKIA TECHNOLOGIES OY, Espoo (FI)
Appl. No. 17/627,234
Filed by NOKIA TECHNOLOGIES OY, Espoo (FI)
PCT Filed Jul. 15, 2020, PCT No. PCT/US2020/042140
§ 371(c)(1), (2) Date Jan. 14, 2022,
PCT Pub. No. WO2021/011656, PCT Pub. Date Jan. 21, 2021.
Claims priority of provisional application 62/874,489, filed on Jul. 15, 2019.
Prior Publication US 2022/0264683 A1, Aug. 18, 2022
Int. Cl. H04W 76/18 (2018.01); H04W 48/16 (2009.01); H04W 60/04 (2009.01); H04W 84/04 (2009.01)
CPC H04W 76/18 (2018.02) [H04W 48/16 (2013.01); H04W 60/04 (2013.01); H04W 84/042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
causing transmission of a packet data unit, PDU, session establishment request message for a PDU session of a data session type, wherein the data session type is one of an Ethernet type and an internet protocol, IP, type;
receiving a response message to the PDU session establishment request message indicating that the PDU session establishment request for the PDU session of the data session type is rejected, wherein the response message comprises a rejection cause, the rejection cause indicating that an allowed data session type is only the unstructured type;
analyzing the rejection cause to identify re-attempt criteria for transmission of a further PDU session establishment request message for a PDU session of the data session type or of a further data session type; and
after determining that at least one of the re-attempt criteria is satisfied, causing transmission of the further PDU session establishment request message for the PDU session of the data session type or of the further data session type;
wherein the re-attempt criteria associated with the rejection cause indicating that the allowed data session type is only the unstructured data session type comprises criterion that is satisfied in an instance in which (a) a user equipment, UE, initiates the further PDU session establishment request message of the unstructured data session type, (b) the UE is registered to a different public land mobile network, PLMN, which was not in a list of equivalent PLMNs at the time when the PDU session establishment request message was transmitted, or (c) the UE is registered to a different PLMN which was in the list of equivalent PLMNs at the time when the response message to the PDU session establishment request message was received and a re-attempt indicator included in the response message to the PDU session establishment request message indicated that re-attempt in an equivalent PLMN is allowed.