Mobile Terminal Assisted GPS Acquisition Logic
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Solution Overview
Problem
Conventional assisted GPS position measuring methods require users to manually acquire assistance information, which can lead to prolonged position measuring times and increased communication charges due to the need for frequent updates, especially when the user's location changes or when the validity of the assistance information expires.
Innovation Solution
A method where a mobile communication terminal autonomously judges the need for assistance information based on predetermined parameters and user activity, requesting updates only when necessary, and stores this information for a set period to ensure quick and accurate position measuring while minimizing communication charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If assistance information is acquired frequently to ensure validity, then position measuring accuracy is improved, but communication charges increase
Solution Approach 1:
The mobile communication terminal autonomously determines whether to acquire assistance information by evaluating its own state (location change detection, time elapsed since last acquisition, GPS satellite visibility conditions) without requiring external instructions, thereby optimizing communication charges while maintaining measurement accuracy
Solution Approach 2:
The system continuously monitors changes in location, time, and GPS satellite visibility conditions, using this feedback to dynamically decide when assistance information acquisition is necessary, balancing accuracy requirements with communication cost reduction
2Loss of energy
If assistance information is acquired manually by user command, then communication charges are reduced, but position measuring time increases
Solution Approach 1:
The terminal proactively acquires assistance information in advance when predetermined conditions are met (location change detected, time threshold exceeded, GPS satellite visibility improves), eliminating the need for user-initiated acquisition and reducing position measuring time while optimizing communication charges
3Reliability
If assistance information is updated frequently, then position measuring reliability is improved, but device complexity increases
Solution Approach 1:
The system changes operational parameters (acquisition timing, update frequency) based on environmental conditions (location, time, GPS satellite visibility) rather than using fixed complex algorithms, achieving reliable position measuring with simplified control logic
Data Source
AI summary
A mobile communication terminal 10A, in a process of acquiring assistance information in advance for using for a GPS position measuring at step S10, makes a judgment of whether or not the assistance information is to be acquired, prior to the GPS position measuring command by a user. When a result of this judgment is affirmative, the terminal 10A transmits an assistance information request to a position measuring assistance server 50. When the assistance information is returned from the position measuring assistance server 50 in response to this the assistance information request, in the cellular phone 10A, the assistance information is received and stored, and then prepared for a command for position measuring by the user, for which possibility of being made is higher in a short period. As a result, it is possible to perform quickly the position measuring of a current location of the mobile communication terminal.