Power control device for mobile communication and method thereof

1. A power control method performed by a mobile communication device comprising a controller, a radio frequency circuit and a baseband circuit, the method comprising:

receiving, by the radio frequency circuit, a Media Access Control (MAC) layer data packet on a first signal;

determining, by the controller, when a second signal is to come according to the MAC layer data packet;

turning off, by the controller, the radio frequency circuit when the first signal is received and the second signal has not yet arrived; and

while the radio frequency circuit is turned off, processing, by the baseband circuit, the received first signal;

wherein the step of determining when a second signal is to come comprises determining when a second signal is to come by SleepStateCapsuleDone and LastPacket bits in the MAC layer data packet.

2. The power control method of claim 1 , further comprising turning on, by the controller, the radio frequency circuit before the second signal is to come.

3. The power control method of claim 1 , further comprising turning on, by the controller, the radio frequency circuit after the baseband circuit finishes processing the received first signal.

4. The power control method of claim 1 , wherein the mobile communication device supports a 3rd generation mobile telecommunications standards, the baseband circuit comprises a searcher circuit;

the searcher circuit is configured to search for multipath of the received first signal; and

the power control method further comprises turning off, by the controller, the searcher circuit when the first signal is received and the second signal has not yet arrived.

5. The power control method of claim 1 , wherein the baseband circuit comprises an automatic gain control circuit configuring an automatic gain control for the RF circuit, and an automatic frequency control circuit configuring an automatic frequency control, the power control method further comprising turning off, by the controller, the automatic gain control circuit and the automatic frequency control circuit when the first signal is received and the second signal has not yet arrived.

6. The power control method of claim 1 , further comprising determining, by the controller, when the second signal is to come based on the first signal.

7. The power control method of claim 1 , further comprising:

determining, by the controller, the first signal is decodable;

wherein the turning off step comprises tuning off the RF circuit when the first signal is decodable.

8. The power control method of claim 1 , wherein the first signal is a synchronous control channel capsule conforming to EVDO standard.

9. The power control method of claim 1 , wherein the MAC layer data packet is transmitted in a synchronous capsule.

10. A power control device for mobile communication, comprising:

an radio frequency circuit, configured to receive a Media Access Control (MAC) layer data packet on a first signal;

a controller, coupled to the radio frequency circuit, configured to determine when a second signal is to come according to the MAC layer data packet, and to turn off the radio frequency circuit when the first signal is received and the second signal has not yet arrived; and

a baseband circuit, coupled to the RF circuit and the controller, while the radio frequency circuit is turned off, configured to processing the received first signal;

wherein the controller is configured to determining when a second signal is to come by SleepStateCapsuleDone and LastPacket bits in the MAC layer data packet.

11. The power control device for mobile communication of claim 10 , wherein the controller is configured to turn on the radio frequency circuit before the second signal is to come.

12. The power control device for mobile communication of claim 10 , wherein the controller is configured to turn on the radio frequency circuit after the baseband circuit finishes processing the received first signal.

13. The power control device for mobile communication of claim 10 , wherein the mobile communication power controlling device supports a 3rd generation mobile telecommunications standards, the baseband circuit comprises a searcher circuit;

the searcher circuit is configured to search for multipath of the received first signal; and

the controller is configured to turn off the searcher circuit when the first signal is received and the second signal has not yet arrived.

14. The power control device for mobile communication of claim 10 , wherein the baseband circuit comprises an automatic gain control circuit configuring an automatic gain control for the RF circuit, and an automatic frequency control circuit configuring an automatic frequency control, and the controller is configured to turn off the automatic gain control circuit and the automatic frequency control circuit when part of the first signal is received and the second signal has not yet arrived.

15. The power control device for mobile communication of claim 10 , wherein the controller is configured to determine when the second signal is to come based on the first signal.

16. The power control device for mobile communication of claim 10 , wherein the controller is configured to determine the first signal is decodable, and turn off the RF circuit when the first signal is decodable.

17. The power control device for mobile communication of claim 10 , wherein the first signal is a synchronous control channel capsule conforming to EVDO standard.

18. The power control device for mobile communication of claim 10 , wherein the MAC layer data packet is transmitted in a synchronous capsule.