Abstract: Methods and systems are presented for providing a combined barometric value. In some embodiments, the method includes obtaining, at the serving fixed local transceiver, barometric values of a plurality of client fixed local transceivers, and determining a combined barometric correction value. The method further includes initiating a barometric correction value of the serving fixed local transceiver to the combined barometric correction value, and sending an indication of the barometric correction value to the plurality of client fixed local transceivers. The method further includes receiving a request for the serving fixed local transceiver barometric correction value from a target client fixed local transceiver, and sending the barometric correction value from the serving fixed local transceiver to the target client fixed local transceiver.

Abstract: An apparatus and method for providing an improved heading estimate of a mobile device in a vehicle is presented. First, the mobile device determines if it is mounted in a cradle attached to the vehicle; if so, inertia sensor data may be valid. While in a mounted stated, the mobile device determines whether it has been rotated in the cradle; if so, inertia sensor data may no longer be reliable and a recalibration to determine a new relative orientation between the vehicle and the mobile device is needed. If the mobile device is mounted and not recently rotated, heading data from multiple sensors (e.g., GPS, gyroscope, accelerometer) may be computed and combined to form the improved heading estimate. This improved heading estimate may be used to form an improved velocity estimate. The improved heading estimate may also be used to compute a bias to correct a gyroscope.

Abstract: A method of providing Observed Time Difference of Arrival (OTDOA) assistance information to a mobile station is disclosed. In some embodiments, the OTDOA assistance information may comprise Positioning Reference Signal (PRS) assistance information including antenna switching assistance information for at least one cell. In one embodiment, the method may be implemented on a location server for the cell.

Abstract: Techniques are provided which may be implemented using various methods and/or apparatuses to determine time difference of arrival of signals from two base stations as received at a mobile device, to use the time difference of arrival to determine differential forward link calibration for at least two base stations, and also to determine location using the differential forward link calibration for at least two base stations, determined using the time difference of arrival of signals from at least two base stations as received by a mobile device.

Abstract: A method for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network includes determining an estimated position of the mobile device and then determining a first set of candidate cells of the plurality of cells based on the estimated position of the mobile device. The method also includes estimating an expected interference of each respective positioning signal that is transmitted by each candidate cell of the first set and selecting a subset of cells from the first set of candidate cells based on the estimated expected interference. Assistance data identifying the selected subset of cells is then generated and sent to the mobile device.

Abstract: Methods, apparatuses, and devices for generating one or more harsh or diminished radiofrequency environments relative to a planned route of a mobile device user. In one example, a mobile device user a be routed through a harsh or diminished radiofrequency environment based, at least in part, on a sensor suite of a mobile device and/or based on a user's preferences. Prior to entry into such an environment, various sensors may be activated in a manner that permits position estimation in an absence of SPS based positioning signals and/or TPS based positioning signals.

Abstract: Methods, apparatuses, and devices for processing Positioning Reference Signals (PRS) bursts are presented. In one example, a mobile device may acquire a first PRS burst transmitted from a base station through first transmitter antenna port and acquire a second PRS burst transmitted from a base station through a second antenna port. The mobile device may select between the first and second acquired PRS bursts for use in positioning operations such as observed time difference of arrival.

Abstract: Methods and apparatus are described for providing location assistance information to a mobile device. An example of a method for providing location assistance information to the mobile device by a femto base station includes receiving a macro base station signal during a monitoring time period during which the femto base station is substantially stationary, obtaining location assistance information, the location assistance information being based, at least in part, on the received macro base station signal, and transmitting the location assistance information to the mobile device.

Abstract: Methods and apparatus are described for providing location assistance information to a mobile device. An example of a method for providing location assistance information to the mobile device by a femto base station includes receiving a macro base station signal during a monitoring time period during which the femto base station is substantially stationary, obtaining location assistance information, the location assistance information being based, at least in part, on the received macro base station signal, and transmitting the location assistance information to the mobile device.

Abstract: A method for assisting a mobile device to perform positioning measurements on positioning signals periodically transmitted by at least some of a plurality of cells in a wireless communication network includes determining an estimated position of the mobile device and then determining a first set of candidate cells of the plurality of cells based on the estimated position of the mobile device. The method also includes estimating an expected interference of each respective positioning signal that is transmitted by each candidate cell of the first set and selecting a subset of cells from the first set of candidate cells based on the estimated expected interference. Assistance data identifying the selected subset of cells is then generated and sent to the mobile device.

Abstract: Methods and apparatus are described for providing location assistance information to a mobile device. An example of a method for providing location assistance information to the mobile device by a femto base station includes receiving a macro base station signal during a monitoring time period during which the femto base station is substantially stationary, obtaining location assistance information, the location assistance information being based, at least in part, on the received macro base station signal, and transmitting the location assistance information to the mobile device.

Abstract: Disclosed are methods, devices and systems for determining a signal search space for acquisition of a satellite positioning system (SPS) signal. For example, a signal transmitted by a terrestrial-based transmitting device may be acquired for use, at least in part, to adjust a receiver for acquisition of SPS signals. The terrestrial-based transmitting device may be classified based, at least in part, on a factor obtained from the acquired signal. An SPS signal search space for the receiver may then be based, at least in part, on a frequency uncertainty corresponding to the classification of said transmitting device.

Abstract: Methods and systems are presented for providing a combined barometric value. In some embodiments, the method includes obtaining, at the serving fixed local transceiver, barometric values of a plurality of client fixed local transceivers, and determining a combined barometric correction value. The method further includes initiating a barometric correction value of the serving fixed local transceiver to the combined barometric correction value, and sending an indication of the barometric correction value to the plurality of client fixed local transceivers. The method further includes receiving a request for the serving fixed local transceiver barometric correction value from a target client fixed local transceiver, and sending the barometric correction value from the serving fixed local transceiver to the target client fixed local transceiver.

Abstract: Described are an apparatus and a method for increasing an uncertainty associated with an estimated position of the apparatus. Signals transmitted from a plurality of stationary transmitters may be acquired, and a difference in received carrier frequency of the acquired signals may be measured. The lower bound of a speed of a mobile device may be determined based at least in part on the measured difference in received carrier frequency. The uncertainty may be increased based at least in part on the lower bound of the speed.

Abstract: Methods, apparatuses, and devices for processing Positioning Reference Signals (PRS) bursts are presented. In one example, a mobile device may acquire a first PRS burst transmitted from a base station through first transmitter antenna port and acquire a second PRS burst transmitted from a base station through a second antenna port. The mobile device may select between the first and second acquired PRS bursts for use in positioning operations such as observed time difference of arrival.

Abstract: Systems, methods, and devices are described for estimating delay difference between two receive chains of a mobile device. The mobile device receives a first signal from a base station using a first receive chain, and receives a second signal using a second receive chain from a common, remote timing source for the base station and the mobile device. In addition, the mobile device obtains a transmit delay parameter associated with the base station and estimates, based at least in part on the transmit delay parameter, an offset value corresponding to a difference between amount of time for the first signal to pass through the first receive chain of the mobile device and amount of time for the second signal to pass through the second receive chain of the mobile device. The mobile device may store the offset value for subsequent use in estimating its position.

Abstract: Methods, devices, and systems are described for using multiple measurements including Doppler measurements from a mobile device to identify the position of the base station. Repeated Doppler and velocity measurements from different locations, with measurement groups taken at the same time or within a certain time frame, may be used to identify the location of a base station with which the mobile device is communicating.

Abstract: Methods, devices, and systems are described for using multiple measurements including Doppler measurements from a mobile device to identify the position of the base station. Repeated Doppler and velocity measurements from different locations, with measurement groups taken at the same time or within a certain time frame, may be used to identify the location of a base station with which the mobile device is communicating.

Abstract: Techniques are provided which may be implemented using various methods and/or apparatuses to determine time difference of arrival of signals from two base stations as received at a mobile device, to use the time difference of arrival to determine differential forward link calibration for at least two base stations, and also to determine location using the differential forward link calibration for at least two base stations, determined using the time difference of arrival of signals from at least two base stations as received by a mobile device.

Abstract: Methods, apparatuses, and devices for generating one or more harsh or diminished radiofrequency environments relative to a planned route of a mobile device user. In one example, a mobile device user a be routed through a harsh or diminished radiofrequency environment based, at least in part, on a sensor suite of a mobile device and/or based on a user's preferences. Prior to entry into such an environment, various sensors may be activated in a manner that permits position estimation in an absence of SPS based positioning signals and/or TPS based positioning signals.