Apparatus and method for improving RSE performance of multi-standby terminal

1. An apparatus for enhancing Radiated Spurious Emission (RSE) performance of a multi-standby terminal, the apparatus comprising:

a first communication module comprising:

an antenna for transmitting and receiving 2 nd Generation (2G) and 3 rd Generation (3G) band signals;

a Radio Frequency (RF) switch, connected to the antenna at one end, for switching between the 2G and 3G signals;

a 2G communication unit, connected to the RF switch, for transmitting and receiving the 2G band signals;

a 3G communication unit, connected to the RF switch, for transmitting and receiving the 3G band signals; and

a first transceiver, connected to the 2G and 3G communication units, for modulating and up-converting signals to be transmitted on the 2G and 3G bands, and for down-converting and demodulating signals received on the 2G and 3G bands,

wherein the 2G communication unit comprises:

a first power amplifier module, connected to the first transceiver, for amplifying power of a transmission signal of the 2G band;

a first filter for filtering out a received signal of the 2G band; and

a first antenna switch module for switching a connection to the RF switch between the first power amplifier module in a transmission period of the 2G communication unit and the first filter in a reception period of the 2G communication unit; and

a second communication module that transmits and receives at least one of the 2G and 3G band signals,

wherein the multi-standby terminal supports a multi-standby mode in which the multi-standby terminal for simultaneously transmitting and receiving the 2G and the 3G band signals via at least two networks.

2. The apparatus of claim 1 , further comprises a first control unit for checking a user identity module, determining a frequency band corresponding to the user identity module, and for sending the recognition result to the first transceiver.

3. The apparatus of claim 2 , wherein the first transceiver controls the RF switch to establish, when the determined frequency band is the 3G band, a connection between the antenna and the 3G communication unit and controls to disable the first antenna switch module of the 2G communication unit.

4. The apparatus of claim 3 , wherein the first antenna switch module connects an input node linked to the RF switch to an opened node when a disable request is received.

5. The apparatus of claim 2 , wherein the first transceiver controls the RF switch to establish, when the determined frequency band is the 2G band, a connection between the antenna and the 2G communication unit and controls to switch the first antenna switch module according to the transmission and reception periods of the 2G communication unit.

6. The apparatus of claim 5 , wherein the first antenna switch module connects an input node linked to the RF switch to a node linked to the first power amplifier module during the transmission period of the 2G communication unit, and connects an input node linked to the RF switch to a node linked to the first filter during the reception period of the 2G communication unit.

7. The apparatus of claim 2 , wherein the first control unit checks a user identity card, determines a frequency band corresponding to the user identity card, controls the RF switch to establish connection between the antenna and the 3G communication unit when the determined frequency band is the 3G band, and disables the first antenna switch module.

8. The apparatus of claim 2 , wherein the first control unit checks a user identity card, determines a frequency band corresponding to the user identity card, controls the RF switch to establish connection between the antenna and the 2G communication unit when the determined frequency band is the 2G band, and switches the first antenna switch module according to the transmission and reception periods of the 2G communication unit.

9. The apparatus of claim 1 , wherein the first antenna switch module comprises a pin diode.

10. The apparatus of claim 1 , wherein the first antenna switch module comprises a single pole multiple throw switch.

11. A method for enhancing Radiated Spurious Emission (RSE) performance of a multi-standby terminal including an antenna for transmitting and receiving 2 nd Generation (2G) and 3 rd Generation (3G) band signals, a Radio Frequency (RF) switch for switching between the 2G and 3G band signals, a first communication module including a 2G communication unit connected to the RF switch for transmitting and receiving 2G band signals and a 3G communication unit connected to the RF switch for transmitting and receiving 3G band signals, a second communication module that transmits and receives at least one of the 2G and 3G band signals, and a transceiver for processing the 2G and 3G band signals, the method comprising:

determining a frequency band by checking a user identity card;

switching, when the determined frequency band is the 3G band, the RF switch to establish a connection between the antenna and the 3G communication unit; and

disabling the 2G communication unit,

wherein the multi-standby terminal supports a multi-standby mode in which the multi-standby terminal for simultaneously transmitting and receiving the 2G and the 3G band signals via at least two networks.

12. The method of claim 11 , wherein disabling of the 2G communication unit comprises breaking a path between the RF switch and the transceiver.

13. The method of claim 11 , wherein, when the determined frequency band is the 2G band, establishing a connection between the antenna and the 2G communication unit via the RF switch.