Integrated power management of a client device via system time slot assignment

• US 8,036,152 B2
• Filed: 01/05/2007
• Issued: 10/11/2011
• Est. Priority Date: 01/06/2006
• Status: Active Grant

• Current Assignee: Proxense, LLC
• Original Assignee: Proxense, LLC
• Inventors: Brown, David L., Hirt, Fred S.
• Primary Examiner(s): Chang; Kent
• Assistant Examiner(s): Elhag; Magdi
• Application Number:
  US11/620,603
• Publication Number:
  US 20070207750A1
• Time in Patent Office: 1,740 Days
• Field of Search: 455/328, 455/265, 455/574, 455/343.2, 455/446, 455/447, 455/448, 455/449, 455/454, 455/41.2, 455/557, 455/151.2, 455/161.1, 370/311, 370/318, 370/328, 370/329, 370/321, 370/324, 370/350, 370/314, 370/310.2, 370/330, 370/337, 370/345, 370/336, 370/458, 370/459, 370/10.2
• US Class Current: 370/311
• CPC Class Codes: H04W 12/02 Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]
• CPC Class Codes: H04W 12/04 Key management, e.g. using generic bootstrapping architecture [GBA]
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/08 Access security
• CPC Class Codes: H04W 12/47 using near field communication [NFC] or radio frequency identification [RFID] modules
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 4/02 Services making use of location information
• CPC Class Codes: H04W 4/06 Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 74/085 collision avoidance
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a wireless network, time slots may be configured in a manner such that the network directs portable wireless client devices to listen and respond within specific time slots. Because the time slots can be predicted or are known, one of the client devices may be configured to set a timer, enter a sleep mode, and then later awaken when a specific, time-slotted data interaction is required of the client device. Accordingly, battery power that would otherwise be consumed if the client device were active outside of the time slot may be saved.

Claims

1. An apparatus, comprising:

a wireless transceiver having an active mode in which power is consumed, and a sleep mode in which power is conserved;

a timer operatively coupled to the wireless transceiver used to indicate when to switch from sleep mode to active mode based on time slot assignment information received by the wireless transceiver; and

processing circuitry operatively coupled to the wireless transceiver and the timer, the processing circuitry arranged to switch the wireless transceiver from the sleep mode to the active mode in response to input from the timer, the processing circuitry also arranged to monitor a first channel for a beacon during the active mode and, if no beacon is detected, increasing a channel number to a second channel and resetting the timer.

2. The apparatus of claim 1, wherein the timer is set to an amount of time until a next time slot.

3. The apparatus of claim 1, wherein an amount of time the wireless transceiver is in the active mode is dynamically adjustable based on the time slot assignment information.

4. The apparatus of claim 1, wherein the wireless transceiver comprises an RF interface.

5. The apparatus of claim 1, wherein the wireless transceiver does not wirelessly communicate data during the sleep mode.

6. The apparatus of claim 1, further comprising:

a battery operatively connected to the wireless transceiver.

21. The apparatus of claim 1, wherein in response to detecting the beacon, the processing circuitry checks for a network identification.

7. A method of facilitating data exchange, comprising:

wirelessly receiving information assigning a time slot for a portable client device to wirelessly communicate data;

placing the wireless transceiver in a sleep mode for a predetermined amount of time;

setting a timer to indicate when to switch from sleep mode to an active mode based on the time slot assignment information; and

activating the wireless transceiver from the sleep mode at a beginning of the time slot in response to input from the timer;

monitoring a first channel for a beacon;

if no beacon is detected, increasing a channel number to a second channel; and

resetting the timer.

8. The method of claim 7, further comprising:

powering the device with a battery operatively connected to a wireless transceiver.

9. The method of claim 7, wherein the wireless transceiver consumes less power when in the sleep mode than when activated.

10. The method of claim 7, further comprising:

setting the timer to indicate the beginning of the time slot.

11. The method of claim 7, further comprising:

setting the timer to an amount of time until a next time slot.

12. The method of claim 7, wherein the wirelessly received information comprises a mask for application to a bit field stored in the client device, wherein the time slot is determined based on the masked bit field.

13. The method of claim 7, further comprising:

applying a mask to a bit field stored in the client device, wherein activating the wireless transceiver from the sleep mode is dependent on the masked bit field.

14. The method of claim 7, further comprising:

setting the timer to indicate a beginning of the sleep mode.

22. The method of claim 7, further comprising the steps of:

detecting the beacon; and

checking for a network identification.

15. A system, comprising:

a network device arranged to wirelessly broadcast synchronization information in a wireless coverage range; and

a portable client device arranged to wirelessly receive the synchronization information during an active state, wherein the synchronization information indicates a time slot for the client device to wirelessly communicate data, wherein the client device utilizes a timer to indicate a time outside of the time slot, and wherein the client device enters a sleep mode in response to input from the timer, and wherein the client device monitors a first channel for a beacon during the active state and, if no beacon is detected, increases a channel number to a second channel and resets the timer.

16. The system of claim 15, wherein the client device comprises a wireless transceiver that is deactivated from wirelessly communicating data when in the sleep mode.

17. The system of claim 15, wherein the synchronization information comprises a mask for application to a bit field stored in the client device.

18. The system of claim 17, wherein the time slot is dependent on the masked bit field.

19. The system of claim 15, wherein a duration of the sleep mode is dependent on the synchronization information broadcast by the network device.

20. The system of claim 15, wherein a duration of the sleep mode is dependent on a power consumption setting determined by at least one of the network device and the client device.

23. The system of claim 15, wherein in response to detecting the beacon, the client device checks for a network identification.