Relative Power Signal Processing for Mobile Terminal Location Accuracy
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Solution Overview
Problem
Current methods for obtaining location information using signal features from base stations suffer from significant errors due to differences in transmit power between measured and to-be-positioned terminals, leading to inaccurate location determination.
Innovation Solution
The method involves receiving signal features from multiple base stations, calculating a relative power set based on signal powers, and using this set along with additional features to determine the location information of the to-be-positioned terminal, thereby reducing the impact of varying transmit powers and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal power is used as a feature for location determination, then location information can be obtained, but the accuracy deteriorates due to different transmit powers of measured and to-be-positioned terminals
Solution Approach 1:
The patent transforms the signal power parameter from an absolute value to a relative value by calculating the difference between signal powers of multiple base stations. This parameter change eliminates the impact of different terminal transmit powers, as the relative power difference remains consistent regardless of the terminal's absolute transmit power level.
Solution Approach 2:
The patent introduces an intermediary approach by using the difference of signal powers as a new feature parameter. Instead of directly using the absolute signal power which is affected by terminal transmit power variations, the solution uses the relative power difference between multiple base stations as an intermediary that cancels out the terminal's transmit power influence.
2Ease of manufacture
If absolute signal power is used for location determination, then the method is simple, but the measurement precision deteriorates due to transmit power variations
Solution Approach 1:
The patent changes the parameter from absolute signal power to relative power difference. This transformation maintains computational simplicity while significantly improving measurement precision, as the relative power calculation only requires subtracting signal power values rather than interpreting absolute values that vary with terminal transmit power.
3Adaptability or versatility
If signal features from multiple base stations are combined, then location determination is possible, but the reliability decreases due to errors from transmit power differences
Solution Approach 1:
The patent applies parameter transformation to all signal features from multiple base stations, converting them from absolute signal powers to relative power differences. This ensures that the combined features from multiple base stations are now invariant to terminal transmit power variations, improving the reliability of location determination while maintaining the versatility of using multiple base stations.
Data Source
AI summary
The present disclosure discloses a method and an apparatus for obtaining location information, and pertains to the field of mobile communications. The method includes: receiving signal features and an identity of a to-be-positioned terminal that are sent by all base stations in multiple base stations, where the signal feature of a base station includes a signal power and an additional feature, and the additional feature includes at least a base station identity of the base station and signal transmission time; determining a relative power set according to signal powers sent by the multiple base stations, where the relative power set includes a relative power between any two base stations in the multiple base stations; and determining, according to the relative power set and additional features sent by the multiple base stations, location information of a terminal corresponding to the identity of the to-be-positioned terminal.