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P. Svoboda, M. Laner, J. Fabini, M. Rupp, F. Ricciato:
"Packet Delay Measurements in Reactive IP Networks";
IEEE Instrumentation & Measurement Magazine, 15 (2012), 6; S. 36 - 43.

Reliable, accurate and meaningful delay measurements in mobile and fixed packet-switched networks are key factors for overall network performance optimization. It has become increasingly challenging due to the asymmetrical and reactive nature of modern networks. Particularly from 3G onwards mobile network technologies like, e.g., High Speed Packet Access (HSPA) schedule and allocate resources depending on parameters like, e.g., the instantaneous traffic load per-user and per-cell, impacts which may not be adjustable by the experimenter.
The IETF IP performance metric framework (IPPM) defines metrics such as, one-way delay and round-trip-delay, and recommends associated methodologies for accurate delay assessment. However, these metrics and methodologies have been developed for wired networks with fixed capacity. They might fail to capture the behavior of reactive networks. In this tutorial we critically analyze the shortcomings of traditional delay measurements, discuss the requirement and present a methodology for measuring delay in mobile radio networks.

Reliable, accurate and meaningful delay measurements in mobile and fixed packet-switched networks are key factors for overall network performance optimization. It has become increasingly challenging due to the asymmetrical and reactive nature of modern networks. Particularly from 3G onwards mobile network technologies like, e.g., High Speed Packet Access (HSPA) schedule and allocate resources depending on parameters like, e.g., the instantaneous traffic load per-user and per-cell, impacts which may not be adjustable by the experimenter.
The IETF IP performance metric framework (IPPM) defines metrics such as, one-way delay and round-trip-delay, and recommends associated methodologies for accurate delay assessment. However, these metrics and methodologies have been developed for wired networks with fixed capacity. They might fail to capture the behavior of reactive networks. In this tutorial we critically analyze the shortcomings of traditional delay measurements, discuss the requirement and present a methodology for measuring delay in mobile radio networks.

delay measurement UMTS packet network

http://dx.doi.org/10.1109/MIM.2012.6365543