A communication mode switching method and apparatus

Embodiment of the present invention discloses a method and a communication mode switching apparatus, comprising: receiving a transmission request; downlink radio frequency signal strength detection channel satisfies a first threshold value; when greater than or equal to the first threshold value, it is determined in operation repeater state, holding a transmission request to the transit mode is completed; when less than the first threshold value, the repeater determines that an abnormal state, switching off the network to transmit the request mode is completed, the off-grid mode is specifically adjusted to the transmit frequency downlink channel after receiving frequency transmit, it can be seen, meets a preset threshold value by the signal strength detector downlink channel to determine whether the repeater is in an abnormal state, so that the targeted transit mode between the operation mode and the talk-around mode switching, thereby using the downlink channel when the relay station is in an abnormal state to a reception frequency as the transmission frequency of the transmission signal, thereby ensuring the other mobile stations can receive the transmitted signal and reduce the call loss ratio.