A.57 Monitoring of incoming GTP packet out-of-order on N3 interface

28.5523GPP5G performance measurementsManagement and orchestrationRelease 18TS

If the sequence is out-of-order during the link transmission between gNB and UPF, especially for the TCP-type service, fast retransmission and even the exponential back-off process of the TCP occur, it will have a great impact on the terminal service rate. Adding the out-of-order packet measurement metrics on the N3 interface is helpful to better observe and evaluate the transmission quality of the data link between the gNB and the UPF. It is of significance to the high-rate and high-reliability services.