System and method for power conservation in a wireless device

• US 7,440,781 B2
• Filed: 10/07/2005
• Issued: 10/21/2008
• Est. Priority Date: 10/07/2005
• Status: Active Grant

• Current Assignee: Symbol Technologies, LLC (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Batta, Puneet, Beach, Robert
• Primary Examiner(s): Le; Thanh C
• Application Number:
  US11/245,576
• Publication Number:
  US 20070082714A1
• Time in Patent Office: 1,110 Days
• Field of Search: None
• US Class Current: 455/574
• CPC Class Codes: H04W 52/0225 using monitoring of external events, e.g. the presence of a signal
• 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

Described is a system and method for power conservation in a wireless device. The method includes switching, by a wireless computing unit, from a first communication mode to a second communication mode at a predefined time interval. The unit receives wireless signals only when in the second communication mode, and the first communication mode is a power-save mode. The unit then receives a wireless signal, and initiates a wireless connection to a wireless arrangement to obtain traffic data from the wireless arrangement when the signal includes a traffic data indicator which is indicative of existence of the traffic data. The unit switches into the first communication mode when the indicator is absent from the signal.

Claims

1. A method, comprising:

switching, by a wireless computing unit, from a first communication mode to a second communication mode at a predefined time interval, wherein the unit receives wireless signals only when in the second communication mode, the first communication mode being a power-save mode;

receiving a wireless signal by the unit;

initiating a wireless connection to a wireless arrangement to obtain traffic data from the wireless arrangement when the signal includes a traffic data indicator, the indicator being indicative of existence of the traffic data; and

switching the unit into the first communication mode when the indicator is absent from the signal, wherein a single absence of only the indicator in the signal is sufficient to switch the unit into the first communication mode.

2. The method according to claim 1, wherein the wireless arrangement includes at least one of a server, a switch, an access point and an access port.

3. The method according to claim 1, wherein the wireless computing unit includes at least one of an image-based scanner, a laser-based scanner, an RFID reader, a PDA, a cell phone and a network interface card.

4. The method according to claim 1, wherein the traffic data includes at least one of a data packet, a VoIP packet and a management packet addressed to the unit.

5. The method according to claim 1, wherein the predefined time interval is about 3 to 5 seconds.

6. The method according to claim 1, wherein the receiving step includes the following substep:

screening wireless signals on a predetermined portion of a radio frequency channel for the signal which includes the indicator.

7. The method according to claim 1, further including:

downloading the traffic data from the wireless arrangement.

8. The method according to claim 1, wherein the wireless signal is one of a beacon and a broadcast packet.

9. The method according to claim 1, further comprising before the first switching step:

terminating the wireless connection to the wireless arrangement.

10. The method according to claim 1, wherein the indicator includes at least one of a MAC address of the unit and a unique identifier assigned to the unit by the wireless arrangement.

11. The method according to claim 1, wherein the indicator is a unique value assigned to the unit during a prior communication session.

12. A system, comprising:

a wireless computing unit having first and second communication modes, the first communication mode being a power-save mode, the unit receiving wireless signals only when in the second communication mode, the unit switching to the second mode at a predefined time interval; and

a network management arrangement transmitting a wireless signal with a traffic data indicator only when traffic data for the unit exists;

wherein when the unit receives the signal including the indicator, the unit initiates a wireless connection to the arrangement to obtain the traffic data, wherein when the indicator is absent from the signal, the unit switches into the first mode, and wherein a single absence of only the indicator in the signal is sufficient to switch the unit into the first mode.

13. The system according to claim 12, wherein the arrangement includes at least one of a server, a switch, an access point and an access port.

14. The system according to claim 12, wherein the unit includes at least one of an image-based scanner, a laser-based scanner, an RFID reader, a PDA, a cell phone and a network interface card.

15. The system according to claim 12, wherein the traffic data includes at least one of a data packet, a VoIP packet and a management packet.

16. The system according to claim 12, wherein the predefined time interval is about 3 to 5 seconds.

17. The system according to claim 12, wherein the unit screens wireless signals on a predetermined portion of a radio frequency channel for the signal which includes the indicator.

18. The system according to claim 12, wherein the unit downloads the traffic data from the wireless arrangement.

19. The system according to claim 12, wherein the wireless signal is one of a beacon and a broadcast packet.

20. The system according to claim 12, wherein the indicator includes at least one of a MAC address of the unit and a unique identifier assigned to the unit by the wireless arrangement.

21. The system according to claim 12, wherein the indicator is a unique value assigned to the unit during a prior communication session.

22. An arrangement, comprising:

a processor switching from a first communication mode to a second communication mode at a predefined time interval; and

a communication arrangement receiving a wireless signal only when in the second communication mode, wherein the processor initiates a wireless connection to a wireless arrangement to obtain traffic data from the wireless arrangement when the signal includes a traffic data indicator, the indicator being indicative of existence of the traffic data, wherein a single absence of only the indicator in the signal is sufficient to switch the processor from the second communication mode to the first communication mode.

23. The arrangement according to claim 22, wherein the processor utilizes the connection to download the traffic data from the arrangement.

24. The arrangement according to claim 22, wherein the processor switches into the first mode when the indicator is absent from the signal.

25. The arrangement according to claim 22, wherein the indicator is a unique value assigned to a wireless unit that includes the processor during a prior communication session.