is there any work or research on measuring method for subscriber (customer)side feelings of network service?
It seems that e2e ping delay, packet loss may miss some important factor when we consider subscriber's feelings.
Although zero packet loss is a sign of very low jitter, you can't generalize that if there is packet loss. Since jitter is important to VoIP and some media streaming, you might want to measure that directly. Of course, if your ping delay measurement is fine-grained enough, then you can calculate the jitter based on the difference between the maximum e2e ping delay and the minimum over a period of time. It's better if the period of time is short enough so that you can learn what your most likely jitter vaues are, not just the worst case. --Michael Dillon