Wireless Device Event Position Approximation
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Solution Overview
Problem
Existing wireless devices face challenges in determining geographical positions efficiently due to high power consumption and inability to perform location services during voice calls, especially when events like call drops occur, as current GPS and Assisted GPS methods require significant processing time and power.
Innovation Solution
A method and apparatus that approximate the geographic location of a wireless device at the time of an event by using a combination of pre-event and post-event location fix information, including time, horizontal location, and velocity data, to calculate the approximate latitude and longitude based on predetermined relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS or Assisted GPS is used to determine the geographical position of a wireless device, then location accuracy is improved, but power consumption increases significantly
Solution Approach 1:
The system performs preliminary location fixes at predetermined intervals before the actual event occurs. These pre-acquired location data points are stored and later used to approximate the event location, eliminating the need for a separate real-time GPS request that would consume additional power.
Solution Approach 2:
Instead of continuously tracking location or taking excessive location fixes, the system uses a partial approach by selecting only the necessary pre-acquired location data points that fall within a predetermined time window before the event, thus reducing overall power consumption while maintaining adequate location approximation accuracy.
2Loss of time
If a location fix request is made during a voice call, then real-time location information is obtained, but the call is interrupted or cannot be maintained
Solution Approach 1:
Location fixes are acquired in advance during periods when the device is not engaged in voice calls. The system stores these location data points and uses them to approximate event locations that occur during calls, thereby avoiding any interruption to call continuity while still providing timely location information for event analysis.
3Measurement precision
If the wireless device requests position location information frequently, then location accuracy is improved, but processing time and power consumption increase
Solution Approach 1:
The system implements periodic location fixing at predetermined intervals rather than continuous or on-demand fixing. This periodic approach ensures that location data is available at regular intervals, providing sufficient accuracy for event location approximation while minimizing the total number of GPS requests and associated processing time.
Data Source
AI summary
Apparatus and methods may approximate a location of an event occurring on a wireless device based upon at least one of a first set of location fix information corresponding to a first set of location fix information corresponding to a first position fix of the wireless device prior to the event and a second set of location fix information corresponding to a second position fix of the wireless device after the event. An event positioning determination module may calculate an approximate geographic location of the wireless device at the time of the event based upon a predetermined relationship between the event and at least one of the first and second set of location fix information.