The invention provides a device used in telecommunication network with one or more base stations which includes: a determination module that is configured to determine a triggering parameter received from the base station whether satisfies triggering condition of reference value, wherein, the base station is operated by multiple network operator and is used for communicating with a mobile terminal though a uplink and downlink, a switch event is used in frequency division multiplexing mode of the mobile terminal, the switch event is executed based on measurement of signal intension and/or signal quality. The triggering condition starts switch measurement depending on environment of the mobile terminal including power value, signal to noise ratio value, value related to the uplink and downlink; and a communication module that provides neighbour list and signal for the mobile terminal when is used as the triggering parameter satisfied the triggering condition, starts signal intension measurement to candidate district based on neighbour list, and obtains best candidate district identification code. The communication module is configured to transmit switch command to mobile station subsequently.