System and method for resilient coverage in a wireless environment

• US 20060270412A1
• Filed: 05/25/2005
• Published: 11/30/2006
• Est. Priority Date: 05/25/2005
• Status: Abandoned Application

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Bekritsky, Benjamin, Wang, Huayan Amy, Willins, Bruce A.
• Application Number:
  US11/137,003
• Publication Number:
  US 20060270412A1
• Time in Patent Office: Days
• US Class Current: 455/445
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Described is a system and method for resilient coverage in a wireless environment. The system may include a first wireless device having a first wireless transceiver; a second wireless device having a second wireless transceiver; and an envelope detection arrangement (“EDA”) coupled to the second device. The second wireless device has a first communication mode and a second communication mode, The second wireless transceiver conducts wireless communications with the first wireless transceiver using a predetermined wireless communication protocol (e.g., IEEE 802.11/16) only when the second wireless device is in the first communication mode. The second wireless transceiver is in a low-power state when in the second communication mode. The EDA screens radio frequency signals for a signal having a predetermined envelope sequence; the signal is generated according to the same predetermined wireless communication protocol. When the EDA receives the signal, the arrangement causes the second wireless device to switch into the first communication mode.

Claims

1. A system, comprising:

a first wireless device including a first wireless transceiver;

a second wireless device including a second wireless transceiver, the second wireless device having a first communication mode and a second communication mode, the second wireless transceiver conducting wireless communications with the first wireless transceiver using a predetermined wireless communication protocol only when the second wireless device is in the first communication mode, the second wireless transceiver being in a low-power state when in the second communication mode; and

an envelope detection arrangement coupled to the second device, the arrangement screening radio frequency signals for a signal having a predetermined envelope sequence, the signal being generated according to the predetermined wireless communication protocol,

wherein, when the arrangement receives the signal, the arrangement causes the second wireless device to switch into the first communication mode.

2. The system according to claim 1, wherein the arrangement includes at least one of a signal strength indicator and an AM demodulator.

3. The system according to claim 1, wherein the signal has at least one temporal characteristic.

4. The system according to claim 1, wherein the predetermined wireless communication protocol is an IEEE 802.11 protocol.

5. The system according to claim 3, wherein the temporal characteristic includes at least one of an 802.11 packet and a time interval.

6. The system according to claim 1, wherein the first wireless device generates and transmits the signal only when the first wireless device failed to connect to a third wireless device which communicates with the first wireless device according to the predetermined wireless communication protocol.

7. The system according to claim 6, wherein, when the second wireless device is in the first communication mode, the second wireless device is a wireless bridge between the first wireless device and the third wireless device.

8. The system according to claim 7, wherein, once the first wireless device directly connects to the third wireless device, the second wireless device switches from the first communication mode to the second communication mode.

9. The system according to claim 1, wherein the second wireless device is a battery-powered device.

10. The system according to claim 9, wherein, when a power level of the battery reaches a predetermined value, the second wireless device transmits a corresponding further signal to one of the first wireless device and a third wireless device.

11. A method, comprising:

screening, by an envelope detection arrangement, radio frequency signals for a signal having a predetermined envelope sequence, the signal being generated according to a predetermined wireless communication protocol, the arrangement coupled to a first wireless device including a first wireless transceiver, the first wireless device having a first communication mode and a second communication mode, the first wireless transceiver conducting wireless communications with a second wireless transceiver of a second wireless device using the predetermined wireless communication protocol only when the first wireless device is in the first communication mode, the first wireless transceiver being in a low-power state when in the second communication mode; and

when the arrangement receives the signal, switching the first wireless device into the first communication mode.

12. The method according to claim 11, wherein the arrangement includes at least one of a signal strength indicator and an AM demodulator.

13. The method according to claim 11, wherein the signal has at least one temporal characteristic.

14. The method according to claim 11, wherein the predetermined wireless communication protocol is an IEEE 802.11 protocol.

15. The method according to claim 13, wherein the temporal characteristic includes at least one of an 802.11 packet and a time interval.

16. The method according to claim 11, further comprising:

generating, by the second wireless device, the signal only when the second wireless device failed to connect to a third wireless device which communicates with the second wireless device according to the predetermined wireless communication protocol; and

transmitting, by the second wireless device, the signal.

17. The method according to claim 16, further comprising:

when the first wireless device is in the first communication mode, acting as a wireless bridge between the second wireless device and the third wireless device.

18. The method according to claim 17, further comprising:

when the second wireless device directly connects to the third wireless device, switching the first wireless device from the first communication mode to the second communication mode.

19. The method according to claim 11, wherein the first wireless device is a battery-powered device.

20. The method according to claim 19, further comprising:

when a power level of the battery reaches a predetermined value, transmitting, by the first wireless device, a corresponding further signal to one of the second wireless device and a third wireless device.

21. A system, comprising:

a mobile computing unit;

a first access point conducting wireless communications with the mobile computing unit according to a predetermined wireless communication protocol;

a second access point having a first communication mode and a second communication mode, the second access point conducting wireless communications using the predetermined wireless communication protocol only in the first communication mode, the second access point being in a low-power state in the second communication mode; and

an envelope detection arrangement coupled to the second access point, the arrangement screening radio frequency signals for a signal having a predetermined envelope sequence, the signal being generated by the mobile computing unit and according to the predetermined wireless communication protocol,

wherein, when the arrangement receives the signal, the arrangement causes the second access point to switch into the first communication mode in order to act as a wireless bridge between the mobile computing unit and the first wireless access point.

22. A wireless device, comprising:

a transceiver conducting wireless communications according to a predetermined wireless protocol;

a battery supplying power to the wireless device; and

an envelope detection arrangement screening radio frequency signals for a signal having a predetermined envelope sequence, the signal generated according to the predetermined wireless protocol,

wherein, the device has a first communication mode and a second communication mode, the device conducting the wireless communications only when in the first communication mode, the device being in a low-power battery state in the second communication mode, and

wherein, when the arrangement receives the signal, the arrangement causes the device to switch into the first communication mode.