Control method and device for communication system, communication system and storage medium

The invention discloses a control method and device for a communication system, the communication system and a storage medium. The control method comprises the following steps: acquiring operation parameters of a first communication network at each historical time point under the condition that the first communication network is used for communication; time sequence analysis is carried out on all the operation parameters, a first trend line corresponding to the signal strength of the first communication network and a second trend line corresponding to the packet loss rate are determined, the predicted signal strength and the predicted packet loss rate of the first communication network at preset time points are determined, and each historical time point is earlier than the preset time point; and controlling the communication system to be switched to a second communication network for communication at a preset time point under the condition that the predicted signal strength is smaller than a preset strength t