Network Based
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UPF selection considers DNN which got configured as part of the APN or DNN profile.
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This DNN is local SGW network specific DNN name.
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The same network DNN or APN name gets configured as part of DNN-list in the network element profile for each user-plane.
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Instead of using APN that comes in CSReq, local DNN is used for the UPF selection based on the DNN list.
For example, in case of roaming scenario where APN is not known, this configuration helps in UPF selection.
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PDN establishment considers these user-planes.
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UPF selection uses Capacity and Priority if many user-planes are available.