scope:

The scope of this Recommendation is to specify a method to measure continuously data two-way latency and loss for a defined observation period. The basis for this method can be IETF's Two-Way Active Measurement Protocol (TWAMP). The typical symmetrical fixed-rate stream method will be modified to reflect situations in today's telecommunication networks including mobile scenarios and typical interactive use cases. The measurement approach is designed to also cover 5G URLLC configurations.

In this approach, a scalable UDP packet stream is sent from and reflected by a far-end server back to the measurement client, e.g., from a smartphone or modem device to a server in the network or a second device.

Based on the results of the latency, latency variation and loss measurements, a generic approach for a model describing interactivity as a single figure of merit is developed. Because the measurement results and the interactivity model depend on the chosen traffic pattern emulating an application, there will be clear rules to derive traffic patterns and corresponding model configurations as well as defined traffic patterns and formulas for popular applications (by applying the defined rules). This allows an immediate application of the measurement approach and enables later extension for new, arising applications.