UE Relative Location Reporting for Lower-Payload Positioning
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Solution Overview
Problem
Existing wireless networks face limitations in reducing the amount of information transmitted for mobile device location reporting due to power, spectrum, and processing constraints.
Innovation Solution
User equipment (UE) reports its own position using reference and relative location information messages, with relative location information messages having a smaller payload size and being transmitted via lower layer signaling, such as MAC CE or UCI, to optimize communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full location information is transmitted in every location report, then location accuracy is maintained, but transmission payload size increases
Solution Approach 1:
The patent extracts only the essential location information (relative location changes) from the complete location data, transmitting only the necessary portion rather than the full location information. This reduces payload size while maintaining the ability to determine accurate location through the reference location combined with relative changes.
Solution Approach 2:
The patent changes the representation parameters of location information by using relative location differences instead of absolute coordinates. This parameter transformation reduces the number of bits required for transmission while preserving the location accuracy when combined with the reference location information.
2Productivity
If relative location information is used to reduce payload size, then transmission efficiency improves, but location information completeness may be compromised
Solution Approach 1:
The patent performs a preliminary action by establishing a reference location information message before transmitting relative location information. This preliminary reference data is stored and used as a basis for interpreting subsequent relative location reports, ensuring that the complete location information can be reconstructed without loss.
Solution Approach 2:
The reference location information acts as an intermediary that bridges the gap between compressed relative location data and complete absolute location information. By introducing this intermediate reference element, the system enables efficient relative location reporting while maintaining information completeness through the combination of reference and relative data.
3Measurement precision
If more detailed location coordinates are reported, then location precision is improved, but power consumption increases
Solution Approach 1:
The patent extracts only the essential precision information needed for accurate location determination by reporting relative location changes rather than complete high-precision coordinates in every message. This extraction approach maintains the necessary location precision while reducing the processing and transmission power required.
Solution Approach 2:
The patent applies partial action by transmitting only the portion of location information that is necessary for maintaining location precision (relative changes), rather than transmitting excessive complete coordinate data. This partial transmission reduces power consumption while achieving the required precision through the reference location combination.
Data Source
AI summary
A user equipment (UE) reports its own position using reference location information messages and relative location information messages. An example method performed by a first UE includes determining a first location of the first UE based on positioning measurements, transmitting a reference location information message indicating the first location, determining one or more subsequent locations of the first UE based on subsequent positioning measurements, and transmitting one or more relative location information messages, each of the one or more relative location information messages indicating a subsequent location for the UE based on relative information with respect to the first location.