WIRELESS WAKE-UP SYSTEM AND OPERATION METHOD THEREOF

• US 20110261907A1
• Filed: 12/15/2010
• Published: 10/27/2011
• Est. Priority Date: 04/23/2010
• Status: Abandoned Application

• Current Assignee: Dong-A University
• Original Assignee: Dong-A University
• Inventors: KO, Ae Kyoung, LEE, Kyoung Moon, KO, Jae Pyung, KIM, Young Chang, KIM, Young Tak, KANG, Dong Seok
• Application Number:
  US12/969,208
• Publication Number:
  US 20110261907A1
• Time in Patent Office: Days
• US Class Current: 375/340
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A wireless wake-up system and an operation method thereof are provided to optimize power consumption when wireless data is received. The wireless wake-up system activates a wake-up detection module and then compares a wireless input signal received through an antenna with a pre-stored reference value. If the wireless input signal is equal to the reference value, the wireless wake-up system determines that the input signal is a wake-up signal with a low bit rate, and then generates a wake-up command corresponding to the wake-up signal. Also, the wireless wake-up system activates a selected module kept in an inactive state by sending the wake-up command to the selected module. The activated module may be a microcontroller unit (MCU). When the MCU is activated, the wireless wake-up system may inactivate the wake-up detection module.

Claims

1. A wireless wake-up system comprising:

an antenna configured to receive a wireless signal; and

a wake-up detection module configured to compare the received signal with a pre-stored reference value in order to determine whether the signal is a wake-up signal with a low bit rate, to generate a wake-up command corresponding to the wake-up signal, and to send the wake-up command to a selected module kept in an inactive state.

2. The system of claim 1, further comprising at least one of:

a microcontroller unit (MCU) configured to be changed from the inactive state to an active state when receiving the wake-up command from the wake-up detection module;

a radio frequency (RF) receiver configured to be activated under the control of the MCU, to perform a demodulation and decoding of a wireless data signal received by the antenna, and to send the decoded signal to the MCU; and

an RF transmitter connected to the antenna and configured to send a signal to the outside.

3. The system of claim 2, wherein at least two of the RF receiver, the RF transmitter and the wake-up detection module are formed in a single integrated chip.

4. The system of claim 1, wherein the wake-up detection module includes:

an amplifier configured to amplify the signal received by the antenna;

a detector configured to detect the amplified signal;

an analog-to-digital convertor (ADC) configured to convert the detected analog signal to a digital signal; and

a wake-up controller configured to compare the digital signal with the reference value and then to generate the wake-up command according to comparison results.

5. The system of claim 4, wherein the wake-up controller includes:

at least one reference register each configured to store at least one reference value;

a shift register configured to store an output signal of the ADC;

at least one comparator configured to compare the reference value stored in the at least one reference register and a value stored in the shift register; and

a wake-up generator configured to generate at least one kind of the wake-up command according to comparison results of the at least one comparator.

6. The system of claim 1, wherein the wake-up system is composed of two or more chips each of which is separately activated and driven in response to the wake-up command.

7. The system of claim 1, wherein the wake-up detection module is further configured to adjust a sampling bit rate of the wake-up signal to 1˜

4 msec according to external inputs.

8. A method for operating a wireless wake-up system, the method comprising steps of:

activating a wake-up detection module;

comparing a wireless input signal received through an antenna with a pre-stored reference value;

if the wireless input signal is equal to the reference value, determining that the input signal is a wake-up signal with a low bit rate and then generating a wake-up command corresponding to the wake-up signal; and

activating a selected module kept in an inactive state by sending the wake-up command to the selected module.

9. The method of claim 8, wherein the activated module includes a microcontroller unit (MCU).

10. The method of claim 9, further comprising at least one of steps of:

inactivating the wake-up detection module when the MCU is activated; and

activating a radio frequency (RF) receiver connected to the MCU, performing a demodulation and decoding of a wireless data signal received by the antenna in the RF receiver, and processing the decoded data signal in the RF receiver.

11. The method of claim 10, further comprising at least one of steps of:

activating the wake-up detection module when the data signal processing is completed; and

inactivating at least one of the MCU and the RF receiver.

12. The method of claim 8, wherein the step of generating the wake-up command includes:

comparing the wireless input signal with two or more reference values; and

if the wireless input signal corresponds to a particular one of the reference values, generating the wake-up command corresponding to the particular reference value.