Is there a way to measure LTE throughput per interface e.g. up to eNB; up to PGW. This would help to identify interface(s) which maybe limiting throughput.
Available tools such as Okla speedtest only measure the effective throughput to the internet.
I’m not sure that we can measure the throughput per each interface, but one test that you probably can do it’s to measure the ping delay and packet loss between each destination point.
All the eNodeB have this capability, also exists some CN test where you can always measure and generate some alarms where you have more packet loss and higher delay. Some vendors have IP Performance Monitor features to schedule tests and monitor by statistics.