METHOD AND APPARATUS FOR CONVERTING TRANSMITTING/RECEIVING FREQUENCY SIGNAL IN FDD COMMUNICATION
The disclosure relates to a method for converting a transmitting/receiving frequency which enables more effective conversion of a transmitting/receiving frequency according to a desired purpose in a communication apparatus using a full duplexing method wherein reception and transmission are performed simultaneously to make the communication apparatus commonly used at a base station and a terminal apparatus, and which enables fast and flexible constitution of the entire network of a communication network, and an apparatus for the method.
1 . An RF front end module apparatus comprising:
a duplexer separating a transmitted signal and a received signal from a transmitting/receiving frequency signal of an antenna;
a path change switch which has a plurality of inputs and outputs, and adaptively forms paths corresponding to the transmitted signal and the received signal by connecting each of the inputs and outputs in a cross direction or a forward direction according to a selected operation mode;
a controller which selects the operation mode, and transmits a control signal for control of connection between the inputs and the outputs in response to the operation mode to the path change switch;
a power amplifier which is positioned on the path of the transmitted signal; and
a low noise amplifier which is positioned on the path of the received signal.
2 . The RF front end module apparatus of claim 1 ,
wherein the duplexer separates the transmitted signal and the received signal according to a frequency division duplexing (FDD) method.
3 . The RF front end module apparatus of claim 1 ,
wherein the path change switch includes two input terminals and two output terminals, and comprises:
a first switch which connects a first input terminal connected to the power amplifier and a first output terminal connected to a downlink band filter of the duplexer;
a second switch which connects the first input terminal and a second output terminal connected to an uplink band filter of the duplexer;
a third switch which connects a second input terminal connected to the low noise amplifier and the first output terminal; and
a fourth switch which connects the second input terminal and the second output terminal.
4 . The RF front end module apparatus of claim 1 ,
wherein the controller selects, based on information on a user's selection and the transmitting/receiving frequency signal, any one of a base station mode supporting cellular communication with a terminal apparatus, a terminal apparatus mode supporting cellular communication with a base station, a relaying terminal apparatus mode supporting a relaying function between a base station and a terminal apparatus in direct communication between terminal apparatuses, and a relay subject terminal apparatus mode receiving support of the relaying function from the relaying terminal apparatus as the operation mode.
5 . The RF front end module apparatus of claim 4 ,
wherein the path change switch is configured to, based on the operation mode selected as the base station mode by the controller, connect each of the inputs and the outputs in a forward direction according to the control signal, and form the path of the transmitted signal which leads to the downlink band filter of the duplexer from the power amplifier and the path of the received signal which leads to the low noise amplifier from the uplink band filter of the duplexer.
6 . The RF front end module apparatus of claim 4 ,
wherein the path change switch is configured to, based on the operation mode selected as the terminal apparatus mode by the controller, connect each of the inputs and the outputs in a cross direction according to the control signal, and form the path of the transmitted signal which leads to the uplink band filter of the duplexer from the power amplifier and the path of the received signal which leads to the low noise amplifier from the downlink band filter of the duplexer.
7 . The RF front end module apparatus of claim 4 ,
wherein the path change switch is configured to, based on the operation mode selected as the relaying terminal apparatus mode by the controller, connect each of the inputs and the outputs in a forward direction according to the control signal, and form the path of the transmitted signal which leads to the downlink band filter of the duplexer from the power amplifier and the path of the received signal which leads to the low noise amplifier from the uplink band filter of the duplexer.
8 . The RF front end module apparatus of claim 4 ,
wherein the path change switch is configured to, based on the operation mode selected as the relay subject terminal apparatus mode by the controller, connect each of the inputs and the outputs in a cross direction according to the control signal, and form the path of the transmitted signal which leads to the uplink band filter of the duplexer from the power amplifier and the path of the received signal which leads to the low noise amplifier from the downlink band filter of the duplexer.
9 . A method for converting a transmitting/receiving frequency signal of an RF front end module apparatus comprising:
separating a transmitted signal and a received signal from a transmitting/receiving frequency signal of an antenna;
selecting an operation mode of the RF front end module apparatus, and generating a control signal for control of connection between inputs and outputs of a path change switch in response to the selected operation mode; and
adaptively forming paths corresponding to the transmitted signal and the received signal by connecting each of the plurality of inputs and outputs included in the path change switch in a cross direction or a forward direction based on the control signal.