Methods and apparatus for controlling a gain state of a wireless receiver operating in an idle mode

1. A method for controlling an operating state of a communication subsystem, the method comprising:

reading and storing in memory a state value which was utilized for operating the communication subsystem during a wake-up period of the communication subsystem;

causing the communication subsystem to enter into a sleep mode;

causing the communication subsystem to exit from the sleep mode and enter into a current wake-up period;

providing the stored state value to the communication subsystem for use in operating the communication subsystem during a warm-up period of the current wake-up period; and

after the warm-up period of the current wake up period, providing a current state value from a state controller to the communication subsystem for use in operating the communication subsystem during the wake up period, the current state value being determined based on a detected signal level of a current signal received in the communication subsystem.

2. The method of claim 1 , further comprising:

for subsequent sleep modes and wake-up periods of the communication subsystem: repeating the reading and storing of the state value, the causing of the communication subsystem to enter into the sleep mode, the causing of the communication subsystem to exit from the sleep mode and enter into the wake-up period, the providing of the stored state value to the communication subsystem, and the providing of the current state value from the controller to the communication subsystem.

3. The method of claim 1 , wherein the signal received in the communication subsystem comprises a radio frequency (RF) signal.

4. The method claim 1 , further comprising:

running a sleep mode timer for the sleep mode; and

in response to expiration of the sleep mode timer, causing the communication subsystem to exit from the sleep mode and enter into the wake-up period.

5. The method of claim 1 , wherein the communication subsystem comprises a wireless receiver.

6. The method of claim 1 , wherein the communication subsystem comprises a wireless receiver, and wherein the act of providing the stored state value to the communication subsystem comprises providing it to an amplifier of the wireless receiver.

7. The method of claim 1 , wherein the state value is one of a plurality of N state values.

8. The method of claim 1 , wherein a communication device having the communication subsystem comprises a mobile station configured to operate in a wireless communication network.

9. An electrical circuit, comprising:

a processor;

memory coupled to the processor;

a communication subsystem coupled to the processor;

a level detector configured to detect a signal level of a signal received in the communication subsystem;

a state controller configured to provide one of a plurality of state values in response to the detected signal level from the level detector;

the processor being configured to:

read and store in memory a state value which was utilized for operating the communication subsystem during a wake-up period of the communication subsystem;

cause the communication subsystem to enter into a sleep mode;

cause the communication subsystem to exit from the sleep mode and enter into a current wake-up period;

provide the stored state value to the communication subsystem for use in operating the communication subsystem during a warm-up period of the current wake-up period; and

after the warm-up period of the current wake up period, provide a current state value from the state controller to the communication subsystem for use in operating the communication subsystem during the wake up period, the current state value being determined based on a detected signal level of a current signal received in the communication subsystem.

10. The electrical circuit of claim 9 , wherein the processor is further configured to:

for subsequent sleep modes and wake-up periods of the communication subsystem: repeat the reading and storing of the state value, the causing of the communication subsystem to enter into the sleep mode, the causing of the communication subsystem to exit from the sleep mode and enter into the wake-up period, the providing of the stored state value to the communication subsystem, and the providing of the current state value from the controller to the communication subsystem.

11. The electrical circuit of claim 9 , wherein the signal received in the communication subsystem comprises a radio frequency (RF) signal.

12. The electrical circuit of claim 9 , wherein the processor is further configured to:

run a sleep mode timer for the sleep mode; and

in response to expiration of the sleep mode timer, cause the communication subsystem to exit from the sleep mode and enter into the wake-up period.

13. The electrical circuit of claim 9 , wherein the communication subsystem comprises a wireless receiver.

14. The electrical circuit of claim 9 , wherein the communication subsystem comprises a wireless receiver, and wherein providing the stored state value to the communication subsystem comprises providing it to an amplifier of the wireless receiver.

15. A communication device, comprising:

a processor;

memory coupled to the processor;

a communication subsystem coupled to the processor;

a level detector configured to detect a signal level of a signal received in the communication subsystem;

a state controller configured to provide one of a plurality of state values in response to the detected signal level from the level detector;

the processor being configured to:

read and store in memory a state value which was utilized for operating the communication subsystem during a wake-up period of the communication subsystem;

cause the communication subsystem to enter into a sleep mode;

cause the communication subsystem to exit from the sleep mode and enter into a current wake-up period;

provide the stored state value to the communication subsystem for use in operating the communication subsystem during a warm-up period of the current wake-up period; and

after the warm-up period of the current wake up period, provide a current state value from the state controller to the communication subsystem for use in operating the communication subsystem during the wake up period, the current state value being determined based on a detected signal level of a current signal received in the communication subsystem.

16. The communication device of claim 15 , wherein the processor is further configured to:

for subsequent sleep modes and wake-up periods of the communication subsystem: repeat the reading and storing of the state value, the causing of the communication subsystem to enter into the sleep mode, the causing of the communication subsystem to exit from the sleep mode and enter into the wake-up period, the providing of the stored state value to the communication subsystem, and the providing of the current state value from the controller to the communication subsystem.

17. The communication device of claim 15 , wherein the signal received in the communication subsystem comprises a radio frequency (RF) signal.

18. The communication device of claim 15 , wherein the processor is further configured to:

run a sleep mode timer for the sleep mode; and

in response to expiration of the sleep mode timer, cause the communication subsystem to exit from the sleep mode and enter into the wake-up period.

19. The communication device of claim 15 , wherein the communication subsystem comprises a wireless receiver.

20. The communication device of claim 15 , wherein the communication subsystem comprises a wireless receiver, and wherein providing the stored state value to the communication subsystem comprises providing it to an amplifier of the wireless receiver.