Abstract: An attenuated satellite positioning system (SPS) signal is acquired using long integration over multiple navigation data bits. To produce a stable internal clock signal to perform the long integration, an external clock signal is received from a highly stable source, such as a wireless communication base station or a nearby femtocell. An internal oscillator is driven at a desired frequency that is aligned with the scaled frequency of the external clock signal to produce the stable internal clock signal. The SPS signal is received and integrated for an extended period using the internal clock signal. Predicted SPS data may be received from an external source and used to perform coherent integration. Alternatively, non-coherent integration may be performed. Additionally, a motion sensor may be used to determine if there is motion relative to the external clock source or to compensate for Doppler errors in the external clock signal due to motion.

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 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: 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: 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: An apparatus and method for initiating a search mode of a mobile device based on the light information in the environment of the mobile device is described herein. The light information may include at least one of color temperature or illuminance, which may be used to determine if the environment of the mobile device is indoors or outdoors. A threshold may be predetermined or adjusted based on received position assistance information. The position assistance information may include at least one of time, day, solar angle, motion information, location information, or weather information.

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: An attenuated satellite positioning system (SPS) signal is acquired using long integration over multiple navigation data bits. To produce a stable internal clock signal to perform the long integration, an external clock signal is received from a highly stable source, such as a wireless communication base station or a nearby femtocell. An internal oscillator is driven at a desired frequency that is aligned with the scaled frequency of the external clock signal to produce the stable internal clock signal. The SPS signal is received and integrated for an extended period using the internal clock signal. Predicted SPS data may be received from an external source and used to perform coherent integration. Alternatively, non-coherent integration may be performed. Additionally, a motion sensor may be used to determine if there is motion relative to the external clock source or to compensate for Doppler errors in the external clock signal due to motion.

Abstract: An attenuated satellite positioning system (SPS) signal is acquired using long integration over multiple navigation data bits. To produce a stable internal clock signal to perform the long integration, an external clock signal is received from a highly stable source, such as a wireless communication base station or a nearby femtocell. An internal oscillator is driven at a desired frequency that is aligned with the scaled frequency of the external clock signal to produce the stable internal clock signal. The SPS signal is received and integrated for an extended period using the internal clock signal. Predicted SPS data may be received from an external source and used to perform coherent integration. Alternatively, non-coherent integration may be performed. Additionally, a motion sensor may be used to determine if there is motion relative to the external clock source or to compensate for Doppler errors in the external clock signal due to motion.

Abstract: An apparatus and method for initiating a search mode of a mobile device based on the light information in the environment of the mobile device is described herein. The light information may include at least one of color temperature or illuminance, which may be used to determine if the environment of the mobile device is indoors or outdoors. A threshold may be predetermined or adjusted based on received position assistance information. The position assistance information may include at least one of time, day, solar angle, motion information, location information, or weather information.

Abstract: An attenuated satellite positioning system (SPS) signal is acquired using long integration over multiple navigation data bits. To produce a stable internal clock signal to perform the long integration, an external clock signal is received from a highly stable source, such as a wireless communication base station or a nearby femtocell. An internal oscillator is driven at a desired frequency that is aligned with the scaled frequency of the external clock signal to produce the stable internal clock signal. The SPS signal is received and integrated for an extended period using the internal clock signal. Predicted SPS data may be received from an external source and used to perform coherent integration. Alternatively, non-coherent integration may be performed. Additionally, a motion sensor may be used to determine if there is motion relative to the external clock source or to compensate for Doppler errors in the external clock signal due to motion.

Abstract: A mobile station determines a usage pattern based on information stored from previous position fixes. The usage pattern is used to predict a time for a next position fix request. The mobile station performs a position fix in the background prior to the predicted time for the next position fix request. The background position fix provides the precise location and time of the mobile station to place the mobile station in a “hot” state. The prediction of the time for the next position fix request may be affected by the remaining battery power and/or the last known location of the mobile station. Additionally, the difference between the predicted time and the actual time of the next position fix request may be used to adjust subsequent predictions of the time for the next position fix request.