Feature Description
The SMF selection of a UPF node is based on certain selection criteria from a list of all UPFs having an active association with the SMF.
The collocated SMF and PGW-C allow the selection of the UPF node based on different query parameters. These parameters consist of DNN, network slice, pdn-type-subscription, pdn-type-session, and DCNR (only for EPS).
The 5GS and EPS core networks applies the selection mechanism to select a UPF node during the creation of a subscriber session.