The invention discloses an
access network switching method and a communication
system. The method comprises the following steps: receiving a measurement report reported by
user equipment; determining a magnitude relationship between first
signal quality in the measurement report and a preset threshold value, and when the first
signal quality is lower than the threshold value, sending a network switching command to the
user equipment, the network switching command at least carrying network information of each
satellite network; receiving a redirection request message which is sent by the
user equipment according to the network switching command and at least carries target network information of a target
satellite network to be accessed; the target network information in the redirection request message is verified, if the
verification is passed, an RRC connection release message is fed back to the user equipment, and the user equipment is used for accessing the target
satellite network according to the RRC connection release message. According to the method and the device, the technical problem that the
access time delay is relatively large and the
user perception is influenced due to the fact that the terminal adopts a manual mode to carry out network switching and redirection is solved.