5GSM handling on invalid PDU session
US11582656B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2021 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Nov 17, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of handling invalid PDU session during handover procedure between non-3GPP access and 3GPP access in a mobile communication network is proposed. A UE establishes a PDU session over a first RAT, and then tries to handover the PDU session from the first RAT to a second RAT. However, at the network side, the PDU session over the first RAT does not exist anymore and the network considers the PDU session to be invalid. The network thus sends a PDU session establishment reject message back to the UE, with a 5GSM status message cause value #54 indicating “PDU session does not exist”. At the UE side, the PDU session over the first RAT is still valid (e.g., not inactive). In order to resynchronize with the network, the UE performs a PDU session release procedure to release the PDU session over the first RAT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.