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For the currently popular WiFi networks, the problem of communication blind spots is more acute, since the access points (APs) are not placed according to a central plan. In this paper, we design an Cyber physical system (CPS) based on an automatic mobile vehicle (AMV) to guarantee the quality of service (QoS) of real-time applications in WiFi networks. When a user enters the blind spot regions, the AMV is able to detect the deterioration of the userpsilas service quality and then move automatically to an appropriate position between the user and AP to serve as a multimedia repeater for the user and maintain the communication quality. Technologies in many fields, such as WiFi and sensor detection, are integrated in our system. In WiFi networks, AMV makes use of received signal strength indicator (RSSI) to evaluate the network quality. Through configuring many types of sensors, such as acceleration sensors and supersonic sensors, we are able to control the speed and direction of AMV, and effect obstacle avoidance. AMV can intelligently compute the best location to perform relaying based on collected statistics of peripheral sensors. It can also support uninterrupted real-time video transmission.