Signalling channel and radio system for power saving in wireless devices

• US 9,306,784 B2
• Filed: 12/11/2014
• Issued: 04/05/2016
• Est. Priority Date: 09/24/2004
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Inventors: Wu, Shiquan, Tong, Wen, Royer, Claude, Sich, Edward
• Primary Examiner(s): LY, ANH VU H
• Application Number:
  US14/567,923
• Publication Number:
  US 20150092649A1
• Time in Patent Office: 481 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference
• CPC Class Codes: H04B 2201/70714 Reducing hardware requirements
• CPC Class Codes: H04L 27/2618 Reduction thereof using auxiliary subcarriers
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0016 Time-frequency-code
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• 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

Wireless devices, transmitters, systems and methods are provided that have a narrow band signaling channel and a wide band channel, for example an OFDM channel. In order to save power, the wireless device is nominally powered down with the exception of a receiver specific to the narrow band signaling channel. Once instructed to do so over the narrow band signaling channel, the wireless device wakes up the rest of its wide band receive circuitry.

Claims

1. A method comprising:

maintaining a wideband receiver in a non-processing and power saving mode, where when awakened, the wideband receiver consumes a greater amount of power for processing plural signals obtained from a corresponding plurality of subcarriers distributed over a pre-specified wide frequency band than when in its non-processing and power saving mode;

receiving, using an associated narrow band receiver, a narrow band signal that is transmitted only in a narrow band adjacent to an edge one of the subcarriers, the narrow band being substantially narrower than the pre-specified wide frequency band, the narrow band signal comprising an indication usable to determine whether or not to wake up the wideband receiver for a case where that wideband receiver is in its non-processing and power saving mode;

processing the received narrow band signal to determine whether to wake up the wideband receiver based, at least in part, on the indication; and

responsive to determining to wake up the wideband receiver, waking up the wideband receiver out of the non-processing and power saving mode so as to thereby enable the awakened wideband receiver to process plural signals of corresponding plural subcarriers of the wide frequency band,

wherein the narrow band signal is located at one of;

an edge portion of the wide frequency band;

or immediately adjacent to but outside of the wide frequency band.

2. The method of claim 1, wherein the narrow band signal further comprises a message for a particular one among a plurality of wireless devices.

3. The method of claim 1 further comprising:

periodically waking up the narrow band receiver from an automatically entered into sleep mode thereof to determine if a next received message within a correspondingly received narrow band signal is one directed to a corresponding wideband receiver associated with the narrow band receiver.

4. The method of claim 1, wherein the plurality of subcarriers distributed over a pre-specified wide frequency band define an Orthogonal Frequency Division Multiplexing (OFDM) signal.

5. The method of claim 1, wherein waking up the wideband receiver further comprises controlling a power supply associated with the wideband receiver.

6. The method of claim 1, wherein the narrow band signal comprises scheduling information associated with the wideband receiver.

7. The method of claim 1 further comprising:

stopping operation of the narrow band receiver while the wideband receiver is operating.

8. One or more processor-readable memory devices comprising processor-executable instructions which, responsive to execution by at least one processor, are configured to enable a machine system to:

maintain in a non-processing and power saving mode, a wideband receiver that when awakened consumes a greater amount of power for processing signals occupying a pre-specified wide frequency band;

receive, using an associated narrow band receiver, a narrow band signal that is transmitted in a narrow band adjacent to an edge portion of the, and that is substantially narrower than the pre-specified wide frequency band, the narrow band signal comprising an indication of whether or not to wake up the wideband receiver for a case where that wideband receiver is in its non-processing and power saving mode;

process the narrow band signal to determine whether to wake up the wideband receiver based, at least in part, on the indication; and

responsive to determining to wake up the wideband receiver, wake up the wideband receiver out of the non-processing and power saving mode so as to thereby enable the awakened wideband receiver to process signals of the wide frequency band,

wherein the adjacent narrow band signal is located at one of;

an edge portion of the wide frequency band;

or immediately adjacent to but outside of the wide frequency band.

9. The one or more processor-readable memory devices of claim 8, wherein the processor-executable instructions are further configured to enable the machine system to:

demodulate the narrow band signal; and

decode the demodulated narrow band signal effective to obtain the indication therein of whether to wake up the wideband receiver.

10. The one or more processor-readable memory devices of claim 8, wherein the wideband signal defines at least one of a Code Division Multiple Access (CDMA) signal and a set of contiguous subcarriers occupying the pre-specified wide frequency band defining an Orthogonal Frequency Division Multiplexing (OFDM) signal.

11. The one or more processor-readable memory devices of claim 8, wherein the processor-executable instructions are further configured to enable the machine system to control a power supply associated with the wideband receiver effective to wake up the wideband receiver.

12. The one or more processor-readable memory devices of claim 8, wherein the processor-executable instructions are further configured to enable the machine system to stop operation of the narrow band receiver while the wideband receiver is operating.

13. The one or more processor-readable memory devices of claim 8, wherein the processor-executable instructions are further configured to enable the machine system to periodically wake up the narrow band receiver to determine if a narrow band signal is being received containing a message specific to a wideband receiver associated with the narrow band receiver.

14. A system to control power consumption of a device, the system comprising:

a wideband receiver implemented, at least in part, in hardware and configured to receive and process a wideband signal occupying a pre-specified wide frequency band;

a narrow band receiver implemented, at least in part, in hardware, and configured to receive a narrowband signal occupying no more that a narrow band adjacent to an edge of the pre-specified wide frequency band;

at least one processor; and

one or more processor-readable memory devices comprising processor-executable instructions which, responsive to execution by the at least one processor, are configured to enable the system to;

receive, using the narrow band receiver, the narrow band signal, the narrow band signal comprising an indication of whether to wake up the wideband receiver when the wideband receiver is in a non-processing and power saving mode;

process the narrow band signal to determine whether to wake up the wideband receiver based, at least in part, on the indication; and

responsive to determining to wake up the wideband receiver, wake up the wideband receiver out of the non-processing and power saving mode effective to process the wideband signal,

wherein the narrow band signal is located at one of;

an edge portion of the wide frequency band;

or immediately

adjacent to but outside of the wide frequency band.

15. The system of claim 14, wherein the narrow band receiver comprises a passive device.

16. The system of claim 14 further comprising:

a power supply; and

a switch connecting the power supply to the wideband receiver, the switch being controlled, at least in part, by the narrow band receiver effective to wake up the wideband receiver.

17. The system of claim 14, wherein the system is further configured to:

demodulate the narrow band signal; and

decode the demodulated narrow band signal effective to determine whether to wake up the wideband receiver.

18. The system of claim 14, wherein the system is further configured to periodically wake up the narrow band receiver.

19. The system of claim 14, wherein the wideband receiver comprises at least one of:

an Orthogonal Frequency Division Multiplexing (OFDM) receiver;

or

a Code Division Multiple Access (CDMA) receiver.

20. The system of claim 14, wherein the system is further configured to process the narrow band signal effective to determine whether the narrow band signal contains a message specific to the system.