# US 2014/0194145 A1 · Method, System and/or Device for Adjusting Expected Received Signal Strength Signature Values > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194145 A1 - Document ID: US20140194145A1 - Status: Published application - Kind: A1 - Application number: 13/736,910 - Filed: 2013-01-08 - Published: 2014-07-10 - Earliest claimed: 2013-01-08 - Assignees: QUALCOMM Incorporated - Applicants: Qualcomm Incorporated - Inventors: Ju-Yong DO; Sai Pradeep VENKATRAMAN; Weihua GAO; Gengsheng ZHANG; Lionel Jacques GARIN - Web page: https://patentgrep.com/patent/US20140194145A1 ## CPC - H04W 52/245: {taking into account received signal strength} - G01R 21/1331: {Measuring real or reactive component, measuring apparent energy} - G01R 22/00: Arrangements for measuring time integral of electric power or current, e.g. electricity meters - G01S 5/021: {Calibration, monitoring or correction (G01S5/0252 takes precedence)} - G01S 5/02521: {using a radio-map} - G01S 5/14: Determining absolute distances from a plurality of spaced points of known location - H04B 17/318: Received signal strength - H04W 4/029: Location-based management or tracking services - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04B: TRANSMISSION ## Abstract Disclosed are systems, methods and devices for application of determining position information for mobile devices. In specific implementations, measurement of a signal travel time and a signal's strength may be combined to characterize a transmission power of the signal's transmitter. The characterized transmission power may be applied to affect expected signal strength signature values for use of the signal's transmitter may be updated in order to enhance a location based service where location may be effected by accuracy of a transmitter's power. ## Claims ### Claim 1 A method comprising, at a computing device: obtaining a measurement of travel time of a first signal transmitted between the computing device and a transmitter; obtaining a measurement of a signal strength of a second signal transmitted by said transmitter and received at a receiver; and combining the measurement of travel time with the measurement of the signal strength to adjust one or more expected signal strength signature values for application to subsequent signals acquired from said transmitter. ### Claim 2 (depends on 1) The method of claim 1 wherein the combining the measurement of travel time with the measurement of the signal strength applies to one or more location based services. ### Claim 3 (depends on 1) The method of claim 1, wherein combining the measurement of travel time with the measurement of signal strength further comprises transmitting said measurement of travel time and measurement of signal strength to a server to compute the adjusted one or more signal strength signature values. ### Claim 4 (depends on 1) The method of claim 1, wherein combining the measurement of travel time with the measurement of the signal strength further comprises: computing an estimated transmission power and estimated path loss based, at least in part, on said measurement of the signal strength and the measurement of travel time; and transmitting the computed estimated transmission power and estimated path loss to a server for use in computing the adjusted one or more signal strength signature values. ### Claim 5 (depends on 1) The method of claim 1, wherein combining the measurement of travel time with the signal strength to adjust one or more signal strength signature values further comprises updating expected signal strength signature values at multiple grid point locations of an indoor area defined by a radio heatmap. ### Claim 6 (depends on 1) The method of claim 1, wherein said measurement of travel time is determined based, at least in part, on a measured round trip time. ### Claim 7 (depends on 1) The method of claim 1, and wherein combining the measurement of travel time with the signal strength to adjust the one or more expected signal strength signature values further comprises calibrating said measurement of said signal strength based, at least in part, on a type of the receiver. ### Claim 8 An apparatus comprising: a transceiver to transmit and receive signals over a wireless communication link; and one or more processors to: obtain a measurement of travel time of a first signal transmitted between the transceiver and a remote transmitter; obtain a measurement of a signal strength of a second signal transmitted by said remote transmitter and received at a receiver; and combine the measurement of travel time with the signal strength to adjust one or more expected signal strength signature values for application to subsequent signals acquired from said remote transmitter. ### Claim 9 (depends on 8) The apparatus of claim 8, wherein the one or more processors are further to combine the measurement of travel time with the measurement of the signal strength further by initiating transmission of said measurement of travel time and measurement of signal strength through said transceiver to a server for computation of the adjusted one or more expected signal strength signature values. ### Claim 10 (depends on 8) The apparatus of claim 8, wherein the one or more processors are to combine the measurement of travel time with the signal strength to adjust one or more signal strength signature values further by updating expected signal strength signature values at multiple grid point locations of an indoor area defined by a radio heatmap. ### Claim 11 (depends on 8) The apparatus of claim 8, wherein said measurement of a travel time is determined based, at least in part, on a measured round trip time. ### Claim 12 (depends on 8) The apparatus of claim 8, wherein the one or more processors are to combine the measurement of travel time with the signal strength to adjust the one or more expected signal strength signature values further by calibrating said measurement of said signal strength based, at least in part, on a type of the receiver. ### Claim 13 (depends on 8) The apparatus of claim 8, wherein the one or more processors are further to: compute an estimated transmission power and estimated path loss based, at least in part, on said measurement of the signal strength and the measurement of travel time; and initiate transmission of the computed estimated transmission power and estimated path loss through the transceiver to a server for use in computing the adjusted one or more expected signal strength signature values. ### Claim 14 An article comprising: a non-transitory storage medium comprising machine-readable instructions stored thereon which are executable by a special purpose computing apparatus to: obtain a measurement of travel time of a first signal transmitted between a mobile device and a transmitter; obtain a measurement of a signal strength of a second signal transmitted by said transmitter and received at said mobile device; and combine the measurement of travel time with the measurement of the signal strength to adjust one or more expected signal strength signature values for application to subsequent signals acquired from said transmitter. ### Claim 15 (depends on 14) The article of claim 14, wherein the instructions are further executable by said special purpose computing apparatus to combine the measurement of travel time with the measurement of the signal strength further by initiating transmission of said measurement of travel time and said measurement of the signal strength to a server for computation of the adjusted one or more expected signal strength signature values. ### Claim 16 (depends on 14) The article of claim 14, wherein the instructions are further executable by said special purpose computing apparatus to combine the measurement of travel time with the measurement of the signal strength to adjust one or more signal strength signature values further by updating expected signal strength signature values at multiple grid point locations of an indoor area defined by a radio heatmap. ### Claim 17 (depends on 14) The article of claim 14, wherein said measurement of travel time is determined based, at least in part, on a measured round trip time. ### Claim 18 (depends on 14) The article of claim 14, wherein the instructions are further executable by said special purpose computing apparatus to combine the measurement of travel time with the signal strength to adjust the one or more expected signal strength signature values further by calibrating said measurement of said signal strength based, at least in part, on a type of receiver. ### Claim 19 (depends on 14) The article of claim 14, wherein the instructions are further executable by the special purpose computing apparatus to: compute an estimated transmission power and estimated path loss based, at least in part, on said measurement of the signal strength and the measurement of travel time; and initiate transmission of the computed estimated transmission power and estimated path loss to a server for use in computing the adjusted one or more expected signal strength signature values. ### Claim 20 An apparatus comprising: means for obtaining a measurement of travel time of a first signal transmitted between a computing device and a transmitter; means for obtaining a measurement of a signal strength of a second signal transmitted by said transmitter and received at a receiver; and means for combining the measurement of travel time with the signal strength to adjust one or more expected signal strength signature values for application to subsequent signals acquired from said transmitter. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the means for combining the measurement of travel time with the measurement of the signal strength further comprises means for transmitting said measurement of travel time and said measurement of the signal strength to a server to compute the adjusted one or more signal strength signature values. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein the means for combining the measurement of travel time with the measurement of the signal strength further comprises: means for computing an estimated transmission power and estimated path loss based, at least in part, on said measurement of the signal strength and the measurement of travel time; and means for transmitting the computed estimated transmission power and estimated path loss to a server for use in computing the adjusted one or more signal strength signature values. ### Claim 23 (depends on 20) The apparatus of claim 20, wherein the means for combining the measurement of travel time with the signal strength to adjust one or more signal strength signature values further comprises means for updating expected signal strength signature values at multiple grid point locations of an indoor area defined by a radio heatmap. ### Claim 24 (depends on 20) The apparatus of claim 20, wherein said measurement of travel time is determined based, at least in part, on a measured round trip time. ### Claim 25 (depends on 20) The apparatus of claim 20, and wherein said means for combining the measurement of travel time with the signal strength to adjust the one or more expected signal strength signature values further comprises means for calibrating said measurement of said signal strength based, at least in part, on a type of the receiver.