GTP-U Path Failure Support at UPF

GTP-U Echo Requests is initiated and sent periodically as per the configured interval on UPF. GTP-U Echo Response is sent for the GTP-U Echo Request received from SMF over GTP-U tunnel.

If Response is not received for the GTP-U Echo Request, the UPF retries Echo Requests based on configured retransmission timeout and maximum retries. When retries are exhausted, the UPF initiates PFCP node

Report Request including (Node ID, Node Report Type, User Plane Path Failure Report including Remote GTP-U Peer).

If UPF receives PFCP Node Report Response and PFCP Session Deletion Request to delete the session, it responds to the deletion request with usage reports.