| CPC H04W 36/0033 (2013.01) [H04W 76/12 (2018.02)] | 8 Claims |
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1. A user plane core network node, comprising:
processing circuitry; and
a non-transitory machine-readable medium storing instructions which, when executed by the processing circuitry, cause the user plane core network node to:
responsive to detection of a trigger event associated with a wireless device having a connection to the telecommunications network via a radio access network node or seeking to establish a connection to the telecommunications network via a radio access network node, receive a message directly from a radio access network node, wherein
the message comprises a context identifier identifying a context for a session for the wireless device,
the context for the session identified by the obtained context identifier is stored in a data storage layer shared among a plurality of user plane nodes,
the plurality of user plane nodes includes at least the user plane node and one or more further user plane nodes, and
the context identifier comprises: an indication of an identifier of the wireless device and/or an indication of an identifier of a session for the wireless device, and
use the context identifier to retrieve the context for the session for the wireless device from the data storage layer shared between the user plane core network node and the one or more further user plane core network nodes, wherein
the user plane core network node is further caused to transmit a second message to the radio access network node, the second message comprising an indication of a new value for the context identifier,
the user plane core network node is further caused to select the new value from a plurality of identifier values which are pre-registered with the data storage layer and associated with the user plane core network node,
the plurality of identifier values are unique among the plurality of wireless devices or unique among the sessions of the plurality of wireless devices,
the user plane core network node is further caused to, responsive to a determination that the new value is unique among a plurality of wireless devices or unique among sessions of the plurality of wireless devices, include the indication of the new value in the second message, and
the trigger event comprises receipt by the radio access network node of a request to establish a protocol data unit session for the wireless device, transition of the wireless device from an idle or inactive mode to a connected or active mode, and/or receipt by the radio access network node of a request to handover the wireless device from a source radio access network node to the radio access network node.
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