Feature Description

The SMF rejects the UPF-originated Session Report Request during any mismatch in the charging configuration of SMF and UPF. Subsequently, the UPF purges the sessions.

Without knowing about the purge operation, the SMF continues to send the N4 message to the UPF. This action triggers the UPF to send “context not found” message to the SMF for the locally purged sessions.

This behavior impacts the UE experience and results in the loss of charging data. So, the current implementation of handling the session report errors is modified to avoid local purging of sessions on the UPF and also to support graceful clearing of sessions.