Short range wireless tracking and event notification system for portable devices

1. A tracking system, comprising:

a portable device;

a first Radio Frequency (RF) module installed in said portable device for transmitting a first wireless signal to a handheld device having installed therein a second RF module for receiving said first wireless signal,

wherein, when a received amplitude of said first wireless signal received by said second RF module is less than a predetermined value, said second RF module generates an alert, wherein said tracking system is operable for implementing a pause mode, wherein in said pause mode said first RF module and said second RF module are turned off when said portable device is in use, wherein said second RF module enters said pause mode in response to a wireless signal received from said first RF module.

2. The tracking system of claim 1 , wherein said first wireless signal comprises event information pertaining to said portable device, and wherein said second RF module generates an event alert to notify a user of said event when said event occurs.

3. The tracking system of claim 1 , wherein said first RF module stops transmitting said first wireless signal when said portable device has an event, and wherein said second RF module generates said alert to notify a user of said event, since said second RF module does not receive said wireless signal.

4. The tracking system of claim 1 , wherein said second wireless signal is also used as a locating signal, such that when said first RF module receives said second wireless signal said portable device generates a locating alert.

5. The tracking system of claim 1 , wherein said portable device comprises a notebook computer.

6. The tracking system of claim 1 , wherein said portable device comprises a cellular phone.

7. A method for tracking a portable device, comprising:

receiving a first wireless signal at a second RF module, said first wireless signal transmitted from a first RF module which is installed in said portable device;

reading an amplitude of said received wireless signal;

comparing said amplitude with a predetermined value;

generating an alert when said amplitude is lower than said predetermined value; and

implementing a pause mode when said portable device is in use, wherein in said pause mode said first RF module and said second RF module are turned off, wherein said second RF module enters said pause mode in response to a wireless signal received from said first RF module.

8. The method of claim 7 , wherein said first wireless signal is periodically transmitted from said first RF module.

9. The method of claim 7 , wherein said first wireless signal is continuously transmitted from said first RF module.

10. The method of claim 8 , further comprising:

incrementing a number each time said amplitude is lower than said predetermined value; and

generating said alert when said number is larger than a predetermined number.

11. The method of claim 8 , further comprising:

stopping transmission of said wireless signal when an event associated with said portable device occurs; and

generating said alert when said amplitude of said received wireless signal is lower than said predetermined value.

12. The method of claim 7 , further comprising:

receiving an event wireless signal that is transmitted from said first RF module when an event associated with said portable device occurs; and

generating an event alert to notify a user of said event.

13. The method of claim 7 , wherein said portable device comprises a notebook computer.

14. The method of claim 7 , further comprising:

transmitting a locating wireless signal from said second RF module to said first RF module, wherein said portable device generates a locating alert in response to said locating wireless signal.

15. The method of claim 7 , further comprising:

transmitting an alert wireless signal from said second RF module to said first RF module, wherein said portable device is locked in response of said alert wireless signal.

16. The method of claim 7 , wherein said generating said alert further comprises:

generating said alert when said amplitude is lower than said predetermined value for a predetermined time period.

17. The method of claim 7 , further comprising:

receiving an adjusting wireless signal from said first RF module; and

adjusting said predetermined value in response to said adjusting wireless signal.

18. The tracking system of claim 2 wherein different event alerts are triggered in response to different types of events.

19. The tracking system of claim 1 , wherein said second RF module generates a second wireless signal comprising a waking up signal that is transmitted by said second RF module to said first RF module, such that when said first RF module receives said second wireless signal and said portable device is in a sleep mode, said portable device is awakened.