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A lightweight evaluation system, which can be deployed on common user equipment in commercial mobile networks, is proposed for measuring the user experience of multimedia services. The user experience evaluation system can measure the key quality indicators of traditional and emerging services in different scenarios. In contrast to traffic models, this system models typical user behavior to construct complex scenarios of communication networks. In commercial network experiments, the proposed evaluation system achieves stable and efficient performance in complex scenarios, which consist of different types of services and typical user behaviors.