Apparatus and methods for low power sensing of wireless access technologies

• US 9,924,465 B2
• Filed: 06/12/2015
• Issued: 03/20/2018
• Est. Priority Date: 06/19/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Krishnaswamy, Dilip, Kanade, Parag M., Subrahmanya, Parvathanathan
• Primary Examiner(s): Chung, Hoon J
• Application Number:
  US14/738,191
• Publication Number:
  US 20160057700A1
• Time in Patent Office: 1,012 Days
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 52/028 switching on or off only a part of the equipment circuit blocks
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Apparatus and methods for low power sensing of wireless access technologies are disclosed. In particular, a mobile wireless device, such as an access terminal, may utilize a lower power circuitry portion that operates at a lower power than active circuitry, such as a primary transceiver. The lower power circuitry portion includes a configurable searcher that is capable of sensing if signals of one or more various wireless access technologies are present. When the wireless device utilizes sleep or idle modes for power savings, use of the lower power sensing circuitry to sense the presence of wireless access technologies, rather than using an awoken higher power primary transceiver for sensing, affords increased power savings. An added ability of the lower power circuitry to be put into sleep or idles modes achieves even greater power savings.

Claims

1. A mobile device comprising:

a sensing circuitry portion configured to operate at a first power level wherein the sensing circuitry portion includes at least one configurable searcher that is operable to sense signals of one or more of a plurality of wireless access technologies supported by the mobile device, where the signals for each of the plurality of wireless access technologies are receivable via a respective wireless chain of a plurality of wireless chains and a baseband processor that are within the sensing circuitry portion and are operable at the first power level; and

a processing circuitry portion including a primary transceiver and configured to demodulate and decode at least one sensed signal of the one or more of the plurality of wireless access technologies, the processing circuitry portion including the primary transceiver operable at a second power level higher than the first power level of the sensing circuitry portion in the mobile device and the primary transceiver operable for demodulating and decoding the at least one sensed signal.

2. The mobile device as defined in claim 1, wherein the at least one configurable searcher produces a trigger signal when a signal of any of the one or more of the plurality of wireless access technologies is sensed, and wherein the trigger signal transitions the processing circuitry portion from a power-saving state to the second power level to demodulate and decode the at least one sensed signal.

3. The mobile device as defined in claim 1, wherein the sensing circuitry portion is further configured to periodically wake up from one of an idle or sleep state and sense the one or more of the plurality of wireless access technologies at a predetermined periodicity wherein the periodicity is either fixed or variable.

4. The mobile device as defined in claim 1, wherein the sensing circuitry portion further comprises:

a buffer configured to store received signals of the one or more of the plurality of wireless access technologies; and

a non-real time processor configured to process the received signals stored in the buffer in a time domain independent from a time domain of at least one of the other circuitry in the sensing circuitry portion and the processing circuitry portion.

5. The mobile device as defined in claim 1, wherein the sensing circuitry portion further comprises:

an adaptive engine configured to adaptively process the signals of the one or more of the plurality of wireless access technologies to at least one of reorder and prioritize a search list of the one or more of the plurality of wireless access technologies based on prior sensed information.

6. The mobile device as defined in claim 5, wherein the prior sensed information includes at least one of signal strength and signal correlation.

7. The mobile device as defined in claim 1, wherein sensing signals of the one or more of the plurality of wireless access technologies includes correlating received signals with at least one scrambling code.

8. The mobile device as defined in claim 1, wherein at least a portion of the sensing circuitry portion is configured with a lower leakage library of design components compared to components in the processing circuitry portion.

9. A method for operating a mobile device that supports multiple wireless access technologies comprising:

searching for one or more of a plurality of wireless access technologies supported by the mobile device using a sensing circuitry portion configured to operate at a power level lower than a higher power level at which a processing circuitry portion including a primary transceiver in the mobile device operates, wherein the processing circuitry portion is configured to demodulate and decode signals of the one or more of the plurality of wireless access technologies supported by the mobile device and signals for each of the plurality of wireless access technologies are receivable via a respective wireless chain of a plurality of wireless chains and a baseband processor that are within the sensing circuitry portion and are operable at the power level lower than the higher power level at which the processing circuitry portion and the primary transceiver operate; and

sending a wakeup trigger from the sensing circuitry portion to the processing circuitry portion when a signal of any of the one or more of the plurality of wireless access technologies is sensed during searching, wherein the wakeup trigger initiates a transition of the processing circuitry portion from a power-saving state to the higher power level.

10. The method as defined in claim 9, wherein the sensing circuitry portion is further configured to periodically wake up from one of an idle or sleep state and sense the one or more of the plurality of wireless access technologies at a predetermined periodicity wherein the periodicity is one of fixed or variable.

11. The method as defined in claim 9, further comprising:

buffering received signals of the one or more of the plurality of wireless access technologies; and

processing the received signals stored in a buffer in a time domain independent from a time domain of at least one of the other circuitry in the sensing circuitry portion and the processing circuitry portion.

12. The method as defined in claim 9, further comprising:

adaptively processing the signals of the one or more of the plurality of wireless access technologies to at least one of reorder and prioritize a search list of the one or more of the plurality of wireless access technologies based on prior sensed information.

13. The method as defined in claim 12, wherein the prior sensed information includes at least one of signal strength and signal correlation.

14. The method as defined in claim 9, wherein sensing signals of the one or more of the plurality of wireless access technologies includes correlating received signals with at least one scrambling code.

15. The method as defined in claim 9, wherein at least a portion of the sensing circuitry portion is configured with a lower leakage library of design components compared to components in the processing circuitry portion.

16. A mobile device that supports multiple wireless access technologies comprising:

means for sensing signals of one or more of a plurality of wireless access technologies supported by the mobile device and operable at a first power level, where the signals for each of the plurality of wireless access technologies are receivable via a respective wireless chain of a plurality of wireless chains and a baseband processor that are within the means for sensing signals and are operable at the first power level; and

means for demodulating and decoding at least one sensed signal of the one or more of the plurality of wireless access technologies, and operable at a second power level higher than the first power level of the means for sensing signals, and the means for demodulating and decoding including a primary transceiver for demodulating and decoding the at least one sensed signal and operable at the second power level higher than the first power level.

17. The mobile device as defined in claim 16, wherein the means for sensing signals is configured to produce a trigger signal when a signal of any of the one or more of the plurality of wireless access technologies is sensed, and wherein the trigger signal transitions the means for demodulating and decoding from a power-saving state to the second power level to demodulate and decode the at least one sensed signal.

18. The mobile device as defined in claim 16, wherein the means for sensing signals is configured to periodically wake up from one of an idle or sleep state and sense the one or more of the plurality of wireless access technologies at a predetermined periodicity wherein the periodicity is either fixed or variable.

19. The mobile device as defined in claim 16, wherein the means for sensing signals further comprises:

means for buffering received signals of the one or more of the plurality of wireless access technologies; and

means for processing the received signals stored in the means for buffering in a time domain independent from a time domain of at least a portion of circuitry in the means for sensing signals and a portion of circuitry in the means for demodulating and decoding.

20. The mobile device as defined in claim 16, wherein the means for sensing further comprises:

means for adaptively processing the signals of the one or more of the plurality of wireless access technologies to at least one of reorder and prioritize a search list of the one or more of the plurality of wireless access technologies based on prior sensed information.

21. The mobile device as defined in claim 20, wherein the prior sensed information includes at least one of signal strength and signal correlation.

22. The mobile device as defined in claim 16, wherein the means for sensing includes means for correlating received signals with at least one scrambling code.

23. The mobile device as defined in claim 16, wherein the means for sensing includes a circuitry portion configured with a lower leakage library of design components compared to components in the means for demodulating and decoding.

24. A computer program product for use within a mobile device that supports multiple wireless access technologies, the computer program product comprising a non-transitory computer readable medium having stored thereon:

code for causing a computer to search for one or more of a plurality of wireless access technologies supported by the mobile device using a sensing circuitry portion configured to operate at a power level lower than a higher power level at which a processing circuitry portion including a primary transceiver in the mobile device operates, wherein the processing circuitry portion is configured to demodulate and decode signals of the one or more of the plurality of wireless access technologies supported by the mobile device and signals for each of the plurality of wireless access technologies are receivable via a respective wireless chain of a plurality of wireless chains and a baseband processor that are within the sensing circuitry portion and are operable at the power level lower than the higher power level at which the processing circuitry portion and the primary transceiver operate; and

code for causing a computer to send a wakeup trigger from the sensing circuitry portion to the processing circuitry portion when a signal of any of the one or more of the plurality of wireless access technologies is sensed during searching, wherein the wakeup trigger initiates a transition of the processing circuitry portion from a power-saving state to the higher power level.

25. The computer program product as defined in claim 24, wherein the sensing circuitry portion is further configured to periodically wake up from one of an idle or sleep state and sense the one or more of the plurality of wireless access technologies at a predetermined periodicity wherein the periodicity is one of fixed or variable.

26. The computer program product as defined in claim 24, the non-transitory computer readable medium further comprising:

code for buffering received signals of the one or more of the plurality of wireless access technologies; and

code for causing a computer to process the received signals stored in a buffer in a time domain independent from a time domain of at least one of the other circuitry in the sensing circuitry portion and the processing circuitry portion.

27. The computer program product as defined in claim 24, the non-transitory computer readable medium further comprising:

code for causing a computer to adaptively process the signals of the one or more of the plurality of wireless access technologies to at least one of reorder and prioritize a search list of the one or more of the plurality of wireless access technologies based on at least one of signal strength and signal correlation.

28. The computer program product as defined in claim 24, wherein sensing signals of the one or more of the plurality of wireless access technologies includes correlating received signals with at least one scrambling code.

29. The computer program product as defined in claim 24, wherein at least a portion of the sensing circuitry portion is configured with a lower leakage library of design components compared to components in the processing circuitry portion.