Latency is a key performance parameter and utilization indicator for providing QoS guarantees and monitoring network performance.In general

monitoring schemes to measure latency are

divided into two types

active and passive monitoring.Unfortunately

both types have drawbacks.The method of combining passive and active approaches uses the latency gained by active measurement as an estimator of the latency of user packets

with weight adjusted by the number of user packets obtained by passive monitoring.This effective method has some advantages such as protocol-independent

negligible extra traffic

convenience and being able to estimate individual user performance.This method considering the number of user data packets arriving between probe packets and the latency alteration of neighborhood probe packets

could reflect the actual network status more exactly

especially in the case of network congestion and packet loss.