Method and apparatus for on-demand mobile device access

1. A network on-demand access method implementable by a mobile phone associated with a base station, the method comprising:

receiving a wakeup signal from the base station by an antenna of the mobile phone;

deriving power from the received wakeup signal;

and

in response to a determination, made using at least the power derived from the received wakeup signal, that the received wakeup signal corresponds to the mobile phone, setting the mobile phone to an active power mode using at least the power derived from the received wakeup signal;

wherein the determination that the received wakeup signal corresponds to the mobile phone is made by:

obtaining an identification code from one or more frequency combinations comprised in the wakeup signal; and

in response to a determination that the obtained identification code matches an identification code of the mobile phone, determining that the received wakeup signal corresponds to the mobile phone.

2. The method of claim 1 , wherein the receiving and the deriving power are performed while the mobile phone is in a power saving mode.

3. The method of claim 1 , wherein deriving the power from the received wakeup signal comprises converting the received wakeup signal to DC power.

4. The method of claim 3 , wherein in response to a determination that the DC power exceeds a threshold, determining that the wakeup signal corresponds to the mobile phone.

5. The method of claim 1 , wherein deriving the power from the received wakeup signal comprises:

converting the received wakeup signal to DC power and applying the DC power to a logic circuit for determining if the received wakeup signal corresponds to the mobile phone.

6. The method of claim 1 , wherein the mobile phone does not reflect back any signal based on the received wakeup signal.

7. The method of claim 1 , wherein:

receiving the wakeup signal comprises receiving the wakeup signal from one or more base stations.

8. The method of claim 1 , further comprising supplying power from a power source for setting the mobile phone to an active power mode.

9. The method of claim 1 , wherein the determination that the received wakeup signal corresponds to the mobile phone is made using

the power derived from the received wakeup signal without power supply from a power source.

10. The method of claim 1 , wherein the determination that the received wakeup signal corresponds to the mobile phone is made using

at least the power derived from the received wakeup signal and a power supply of less than 10 dBm.

11. The method of claim 1 , wherein the determination that the received wakeup signal corresponds to the mobile phone is made using

at least the power derived from the received wakeup signal and a power supply of less than 1 dBm.

12. A mobile phone associated with a base station, comprising:

an antenna configured to receive a signal from the base station;

a rectifier circuit configured to derive power from the received signal;

a logic circuit configured to determine if the received signal corresponds to the mobile phone using at least the power derived by the rectifier circuit from the received signal; and

a control circuit configured to, in response to a determination that the received signal corresponds to the mobile phone, set the mobile phone to an active mode using at least the power derived from the received signal;

wherein, to determine if the received signal corresponds to the mobile phone, the logic circuit is configured to:

obtain an identification code from one or more frequency combinations comprised in the signal;

compare the identification code obtained from the signal with an identification code of the mobile phone; and

if the obtained identification code matches the identification code of the mobile phone, determine that the received signal corresponds to the mobile phone.

13. The mobile phone of claim 12 , wherein, to derive power from the received signal, the rectifier circuit is configured to convert the received signal to DC power.

14. The mobile phone of claim 12 , wherein the logic circuit is configured to determine if the received signal corresponds to the mobile phone while the mobile phone is in a power saving mode.

15. The mobile phone of claim 12 , wherein the control circuit is further configured to, in response to a determination that the received signal does not correspond to the mobile phone, leave the mobile phone in the power saving mode.

16. The mobile phone of claim 12 , wherein the logic circuit is further configured to derive power only from the rectifier circuit for determining if the received signal corresponds to the mobile phone.

17. The mobile phone of claim 12 , further comprising a power source configured to supply less than 10 dBm to the logic circuit for determining if the received signal corresponds to the mobile phone.

18. The mobile phone of claim 12 , wherein the control circuit is configured to derive power only from the rectifier circuit for setting the mobile phone to an active mode.

19. A network on-demand access method to be performed by a mobile phone associated with a base station, comprising:

receiving a signal from the base station while the mobile phone is in a power saving mode;

rectifying the received signal to derive DC power;

and

in response to a determination, made using the derived DC power, that the received signal corresponds to the mobile phone, setting the mobile phone to an active power mode using the derived DC power;

wherein the determination that the received signal corresponds to the mobile phone is made by:

obtaining an identification code from one or more frequency combinations comprised in the received signal; and

in response to a determination that the obtained identification code matches an identification code of the mobile phone, determining that the received signal corresponds to the mobile phone.