Differential Positioning Measurement Reporting in 5G Networks
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Solution Overview
Problem
Current wireless positioning systems face inefficiencies in reporting measurements and transmission-reception point (TRP) identifiers due to high overhead in positioning state information (PSI) reporting, particularly in 5G networks, which affects latency and spectral efficiency.
Innovation Solution
Implementing a method where user equipment (UE) performs positioning measurements on downlink positioning reference signals (DL-PRS) and reports relative values or identifiers via low-layer signaling, using positioning assistance information to reduce the reporting overhead by configuring expected values and uncertainties, thereby minimizing the bit length required for measurement reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full measurement values and TRP identifiers are reported in positioning state information, then positioning accuracy is maintained, but signaling overhead increases and spectral efficiency decreases
Solution Approach 1:
The patent changes the parameter representation from absolute measurement values to differential values (differences between actual and expected measurements). This parameter transformation reduces the number of bits required to encode positioning measurements while maintaining the ability to reconstruct accurate position information at the receiver side.
Solution Approach 2:
The network provides expected measurement values and uncertainty configurations to the UE in advance through positioning assistance information. This preliminary action enables the UE to compute differential values with reduced precision requirements, thereby reducing reporting overhead while maintaining positioning accuracy.
2Measurement precision
If detailed positioning measurements are reported, then positioning accuracy is improved, but reporting latency increases due to larger message sizes
Solution Approach 1:
By transforming measurement parameters from absolute to differential representation, the patent reduces the bit length of positioning reports. This parameter change directly decreases the time required to transmit measurement data from UE to network, thereby reducing reporting latency while preserving positioning accuracy through the differential encoding scheme.
3Reliability
If complete TRP identifiers and measurement data are transmitted, then positioning reliability is maintained, but spectral efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent applies parameter transformation by reporting differences between actual and expected measurements rather than absolute values. This reduces the signaling overhead for positioning information while maintaining the reliability needed for accurate positioning, thereby improving spectral efficiency by transmitting fewer bits for the same positioning quality.
Solution Approach 2:
The network pre-configures expected measurement values and uncertainty parameters through positioning assistance information. This preliminary provision of reference data enables the UE to generate compact differential reports that maintain positioning reliability while consuming less spectrum resources.
Data Source
AI summary
Disclosed are techniques for reducing the overhead of low layer positioning reports. In an aspect, a user equipment (UE) performs at least one positioning measurement of at least one downlink positioning reference signal (DL-PRS) received from at least one transmission-reception point (TRP) during a positioning session, and reports, to a positioning entity via low layer signaling, a relative value of the at least one positioning measurement relative to an expected value of the at least one positioning measurement, wherein the relative value of the at least one positioning measurement is a difference between the expected value of the at least one positioning measurement and a measured value of the at least one positioning measurement.