News Column

Patent Issued for Adaptive Passive Scanning And/Or Active Probing Techniques for Mobile Device Positioning

August 27, 2014



By a News Reporter-Staff News Editor at Telecommunications Weekly -- QUALCOMM Incorporated (San Diego, CA) has been issued patent number 8805423, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.

The patent's inventors are Sridhara, Vinay (Santa Clara, CA); Das, Saumitra Mohan (San Jose, CA); Naguib, Ayman Fawzy (Cupertino, CA); Palanki, Ravi (San Diego, CA).

This patent was filed on August 9, 2012 and was published online on August 12, 2014.

From the background information supplied by the inventors, news correspondents obtained the following quote: "The subject matter disclosed herein relates to electronic devices, and more particularly to methods, apparatuses and articles of manufacture for adaptive passive scanning and/or adaptive active probing techniques to support mobile device positioning.

"Mobile devices, such as mobile phones, notebook, computers, etc., typically have the ability to estimate location and/or position with a high degree of precision using any one of several technologies such as, for example, satellite positioning systems (e.g., GPS and the like), advanced forward-link trilateration (AFLT), just to name a few examples of signal-based positioning systems and/or corresponding signal-based positioning signals. Using high precision location information, applications for a mobile device may provide a user with various services, such as, for example, vehicle/pedestrian navigation, location-based searching, just to name a couple of examples. Here, high precision signal-based location information (e.g., obtained from GPS and/or other signal-based positioning systems) may be processed according to a global coordinate system (e.g., latitude and longitude or earth-centered xyz coordinates). While such use of signal-based location information referenced to a global coordinate system may be useful in providing some services (e.g., outdoor vehicle navigation), such signal-based location information referenced to a global coordinate system may be impractical for other types of services such as indoor pedestrian navigation.

"In certain indoor environments, such as office buildings, shopping malls, airports, stadiums, etc., certain example signal-based positioning techniques may make use of various terrestrial-based wireless signal transmitting devices, e.g., wireless network service access transceivers, cellular network base stations, special-purpose beacon transmitters, etc., that transmit wireless signals which may be acquired by the mobile device and used for positioning purposes. For example, a mobile device may receive a signal-based positioning signal from a transmitter and based thereon determine a pseudorange between the transmitter and receiver. Hence, for example, positioning may be provided based on trilateration and/or other known signal-based positioning techniques.

"In some implementations, an indoor navigation system may provide a digital electronic map to mobile devices as they enter a particular indoor area. Such an electronic map may show indoor features such as doors, hallways, entry ways, walls, etc., points of interest such as bathrooms, pay phones, room names, stores, etc. Such an electronic map may be stored at a server to be accessible by a mobile device through selection of a URL, for example. By obtaining and rendering all or part of an electronic map via a display mechanism, a mobile device may, for example, overlay a current location of the mobile device (and user) over the displayed map to provide the user with additional context.

"In certain instances, in addition to an electronic map, an indoor navigation system may selectively provide assistance information to mobile devices to facilitate and/or enable various location based services. Such assistance information may include, for example, information to facilitate measurements of ranges to wireless service access transceivers at known fixed locations. In one implementation, For example, a 'radio heatmap' or 'probability heatmap' indicating and/or otherwise modeling expected RSSI and/or round-trip delay times at particular locations associated with service access transceivers may enable a mobile device to associate acquired signal measurements with one of the particular locations in an indoor environment. Here, for example, grid points may be laid over locations in an indoor environment at a uniform spacing (e.g., 0.5 meter separation of neighboring grid points), or possibly with non-uniform spacing. Thus, radio heatmap and/or other corresponding probability functions/models may be made available from a computing device (such as a server) for each grid point covering an indoor environment."

Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "In accordance with certain aspects, a method may be provided which comprises, with a mobile device: acquiring signals from a plurality of wireless transceivers; identifying each of the plurality of wireless transceivers based, at least in part, on one or more of the acquired signals; determining a received signal strength measurement for each of the plurality of wireless transceivers based, at least in part, on one or more of the acquired signals; and determining a transmission power of a probe signal to be transmitted to at least one of the plurality of wireless transceivers based, at least in part, on at least one of the received signal strength measurements.

"In accordance with certain other aspects, an apparatus may be provided for use in a mobile device. Such an apparatus may, for example, comprise: means for acquiring signals from a plurality of wireless transceivers; means for identifying each of the plurality of wireless transceivers based, at least in part, on one or more of the acquired signals; means for determining a received signal strength measurement for each of the plurality of wireless transceivers based, at least in part, on one or more of the acquired signals; and means for determining a transmission power of a probe signal to be transmitted to at least one of the plurality of wireless transceivers based, at least in part, on at least one of the received signal strength measurements.

"In accordance with still other aspects, a mobile device may be provided which comprises a processing unit to: identify each of a plurality of wireless transceivers based, at least in part, on one or more signals acquired from the plurality of wireless transceivers; determine a received signal strength measurement for each of the plurality of wireless transceivers based, at least in part, on one or more of the signals acquired from the plurality of wireless transceivers; and determine a transmission power of a probe signal to be transmitted to at least one of the plurality of wireless transceivers based, at least in part, on at least one of the received signal strength measurements.

"In accordance with still further aspects, an article of manufacture may be provided for use by mobile device. For example, such an article of manufacture may comprise a non-transitory computer readable medium having computer implementable instructions stored therein that are executable by a processing unit in the mobile device to: initiate acquisition of signals from a plurality of wireless transceivers; identify each of the plurality of wireless transceivers based, at least in part, on one or more of the acquired signals; determine a received signal strength measurement for each of the plurality of wireless transceivers based, at least in part, on one or more of the acquired signals; determine a transmission power of a probe signal to be transmitted to at least one of the plurality of wireless transceivers based, at least in part, on at least one of the received signal strength measurements."

For the URL and additional information on this patent, see: Sridhara, Vinay; Das, Saumitra Mohan; Naguib, Ayman Fawzy; Palanki, Ravi. Adaptive Passive Scanning And/Or Active Probing Techniques for Mobile Device Positioning. U.S. Patent Number 8805423, filed August 9, 2012, and published online on August 12, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8805423.PN.&OS=PN/8805423RS=PN/8805423

Keywords for this news article include: QUALCOMM Incorporated.

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Source: Telecommunications Weekly


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