Network Node Positioning Signal Management via GDOP Optimization
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Solution Overview
Problem
In 5G wireless communications networks, particularly in Frequency Range 2 (FR2), the transmission of Positioning Reference Signals (PRS) to all beams results in unnecessary overhead due to higher path loss at higher carrier frequencies, and current methods do not consider geometry or positioning errors effectively, leading to suboptimal positioning accuracy.
Innovation Solution
A method where a network node recommends configurations for multiple Transmission Reception Points (TRPs) to transmit positioning signals, and both the network node and User Equipment (UE) calculate and manage the Geometric Dilution of Precision (GDOP) to optimize the transmission of positioning signals based on positioning measurement results, thereby reducing unnecessary PRS transmission and improving positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRS are transmitted to all beams in FR2, then positioning coverage is improved, but transmission overhead increases due to higher path loss
Solution Approach 1:
The patent applies local quality by selectively transmitting PRS only from TRPs that have favorable geometric relationships with the UE, rather than transmitting to all beams uniformly. The network determines which TRPs should transmit PRS based on local geometric conditions (GDOP calculations) and transmission quality metrics, optimizing the balance between coverage and overhead reduction.
2Measurement precision
If PRS are transmitted to all TRPs, then positioning accuracy is improved, but unnecessary transmission overhead occurs
Solution Approach 1:
The patent changes the parameter of transmission selection from uniform all-TRP approach to selective TRP-based approach. The network calculates GDOP values and transmission quality metrics for each TRP, and uses these parameter changes to determine which TRPs should transmit PRS, thereby reducing unnecessary overhead while maintaining positioning accuracy.
Solution Approach 2:
The patent implements feedback mechanisms where the network receives measurement reports from UEs including GDOP results and transmission quality information. This feedback is used to dynamically adjust which TRPs transmit PRS in subsequent positioning sessions, optimizing the balance between accuracy and overhead reduction based on actual measurement data.
3Loss of energy
If GDOP is calculated and used to manage TRP selection, then positioning overhead is reduced, but system complexity increases
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously calculate GDOP values and provide this information to the network for TRP selection decisions. The UE performs the complex GDOP calculations locally based on its positioning measurements and geometric knowledge, reducing the processing burden on the network while still achieving optimized TRP selection.
Data Source
AI summary
A method performed by a network node for handling positioning of a User Equipment (UE) in a wireless communications network is provided. The network node recommends (601) configurations for multiple Transmission Reception Points (TRPs), to transmit positioning signals. The network node further recommends (602) a configuration for the UE to perform positioning measurement of the positioning signals transmitted by the multiple TRPs. The network node obtains (604) a position of the UE based on positioning measurement results of the multiple TRPs. The network node obtains (605) errors based on uncertainty associated with the positioning measurement results of the multiple TRPs. The network node obtains (606) a Geometric Dilution of Precision (GDOP) for the multiple TRPs based on the obtained errors and the position of the UE. The network node then manages (607) transmission of the positioning signals of the multiple TRPs, based on the obtained GDOP.