Methods and apparatuses for establishment of pdu session
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsYunjie LU, Stefan ROMMER
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Abstract
Methods and apparatuses for establishment of protocol data unit (PDU) session are disclosed. A first network function determines whether a first session management function (SMF) for a PDU session to be established for a terminal device supports insertion/change of a second SMF. When determining that the first SMF for the PDU session does not support insertion/change of the second SMF, the first network function sends, to a second network function, a query request for discovering at least one second SMF that can serve whole public land mobile network (PLMN) to which the first network function belongs. The first network function receives a query response from the second network function.
Claims20
A method performed by a first network function, comprising:
- determining, whether a first session management function (SMF) operative with a terminal device, supports deployments topologies with specific SMF service areas (DTSSA) for a protocol data unit (PDU) session to be established for the terminal device;
- when the first SMF for the PDU session does not support DTSSA, sending, to a second network function, a query request for discovering a second SMF that can serve whole public land mobile network (PLMN) of the first network function;
- and
- receiving a query response from the second network function to the query request regarding discovery of the second SMF, wherein the query response comprises information about a third SMF that cannot serve the whole PLMN, when the second SMF that can serve the whole PLMN is not found.
A method performed by a second network function, comprising:
- receiving, from a first network function, a query request for discovering a second session management function (SMF) that can serve whole public land mobile network (PLMN) to which the first network function belongs, where the query request is generated when a first SMF for a protocol data unit (PDU) session to be established for a terminal device does not support deployments topologies with specific SMF service areas (DTSSA);
- and
- sending, to the first network function, a query response to the query request regarding discovery of the second SMF, wherein the query response comprises information about a third SMF that cannot serve the whole PLMN, when the second SMF that can serve the whole PLMN is not found.
A first network node comprising:
- at least one processor;
- and
- at least one memory, the at least one memory containing instructions which, when executed by the at least one processor, cause the first network node to:
- determine, whether a first session management function (SMF) operative with a terminal device, supports deployments topologies with specific SMF service areas (DTSSA) for a protocol data unit (PDU) session to be established for the terminal device;
- when the first SMF for the PDU session does not support DTSSA, send, to a second network node, a query request for discovering a second SMF that can serve whole public land mobile network (PLMN) of the first network node;
- and
- receive a query response from the second network node to the query request regarding discovery of the second SMF, wherein the query response comprises information about a third SMF that cannot serve the whole PLMN, when the second SMF that can serve the whole PLMN is not found.
Dependencies are inferred from the claim text.