US 12,225,417 B2
Coordinated change of protocol data unit session anchors
György Miklós, Pilisborosjenö (HU); Balázs Varga, Budapest (HU); János Farkas, Kecskemét (HU); and János Harmatos, Budapest (HU)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/769,498
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Oct. 22, 2019, PCT No. PCT/IB2019/059034
§ 371(c)(1), (2) Date Apr. 15, 2022,
PCT Pub. No. WO2021/079171, PCT Pub. Date Apr. 29, 2021.
Prior Publication US 2023/0156531 A1, May 18, 2023
Int. Cl. H04W 36/00 (2009.01)
CPC H04W 36/0027 (2013.01) [H04W 36/0011 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for coordinated change of Protocol Data Unit (PDU) Session Anchors (PSAs) the method comprising:
at a node for maintaining PSA change status for PDU sessions:
receiving, from a requesting entity, a request for a PSA change for a first PDU session having a first PSA, where the first PDU session and a second PDU session are redundant PDU sessions with each other;
determining whether the PSA change for the first PDU session is temporarily prohibited;
upon determining that the PSA change for the first PDU session is temporarily prohibited,
denying the request for the PSA change for the first PDU session; and
upon determining that the PSA change for the first PDU session is not temporarily prohibited:
granting the request for the PSA change for the first PDU session;
setting a PSA change status associated with the first PDU session to indicate that the PSA change for the first PDU session is temporarily prohibited;
subsequently receiving an indication that the PSA change for the first PDU session is completed; and
setting the PSA change status associated with the first PDU session to indicate that the PSA change for the first PDU session is allowed,
wherein determining that the PSA change for the first PDU session is temporarily prohibited comprises at least one of: determining that the first PDU session is currently undergoing a handover; determining that the second PDU session is currently undergoing a handover; and/or determining that the second PDU session is currently undergoing a PSA change.