Abstract: An improved handoff test method for mobile communication stations which is capable of more easily testing a handoff function between switching stations by providing a handoff generation and control apparatus and processing a forward hard handoff and a backward hard handoff using a handoff signal and a control signal outputted from the handoff generation and control apparatus.

Abstract: An improved echo removing system by which it is possible to more effectively remove echoes which occur during a wireless communication between a mobile communication subscriber and a fixed communication subscriber in a CDMA type mobile communication exchange system, which includes a signal input unit connected between the remote network/station interface unit and the first time switch connection unit for receiving a transmitting and receiving audio signal, an echo removing processor for detecting a difference between the transmitting audio signal and the receiving audio signal outputted from the signal input unit and for removing an echo component from the receiving audio signal in accordance with the control signal from the time switch connection/disconnection controller, and a second time switch connection unit for time-switching in order for the output signal from the echo removing processor to be transmitted to the mobile communication subscriber through the system inside connection unit in accordance wit