5G Positioning Reference Signal Configuration for Accuracy
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Solution Overview
Problem
In 5G mobile communication systems, there is a challenge in accurately requesting and reporting positioning assistance data and measurement results, particularly due to the introduction of millimeter wave frequency bands and the need for advanced techniques like beamforming and massive MIMO, which complicate terminal positioning in IoT and machine-type communication scenarios.
Innovation Solution
The solution involves a terminal receiving scheduling information from a base station, acquiring system information to request positioning assistance data, and then transmitting this data to a Location Management Function (LMF) to receive and report positioning information, including time differences between Transmission Reception Points (TRPs), enabling more precise positioning methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If millimeter wave frequency bands are introduced to increase propagation distance, then propagation loss is mitigated, but positioning accuracy deteriorates due to signal characteristics
Solution Approach 1:
The patent introduces positioning reference signals (PRS) as intermediary elements between the base station and terminal for positioning measurements. These dedicated reference signals enable accurate time difference measurements despite the challenges of millimeter wave propagation, serving as a mediator that bridges the gap between long-distance propagation needs and positioning accuracy requirements.
Solution Approach 2:
The patent employs multiple positioning reference signal resources with different parameters (time, frequency, spatial domain) to enable accurate positioning measurements. By changing and optimizing these signal parameters across multiple dimensions, the system maintains positioning accuracy even when using millimeter wave frequency bands for extended propagation distance.
2Temperature
If beamforming and massive MIMO techniques are applied to increase propagation distance, then signal coverage is improved, but positioning measurement complexity increases
Solution Approach 1:
The patent segments positioning reference signals into multiple resources distributed across time, frequency, and spatial domains. This segmentation allows the terminal to perform measurements on individual signal resources rather than processing the entire complex signal environment, reducing measurement complexity while maintaining coverage benefits from beamforming and massive MIMO.
Solution Approach 2:
The patent extends positioning reference signal resources into multiple dimensions (time, frequency, spatial domain). By distributing measurement opportunities across these additional dimensions, the system reduces the complexity of measurements in any single dimension while maintaining overall signal coverage through beamforming and massive MIMO techniques.
3Measurement precision
If multiple positioning reference signal resources are configured for accurate positioning, then positioning accuracy is improved, but information acquisition overhead increases
Solution Approach 1:
The patent designs positioning reference signals with universal structures that can be configured across multiple resources with different parameters. These multi-functional signal resources serve both coverage extension and accurate positioning measurement purposes simultaneously, reducing the need for separate dedicated resources and thereby lowering information acquisition overhead.
4Temperature
If positioning reference signals are transmitted in all directions for comprehensive coverage, then coverage is improved, but uplink resource consumption increases
Solution Approach 1:
The patent applies local quality by configuring positioning reference signal resources with direction-specific parameters. Instead of uniform omnidirectional transmission, the system optimizes signal characteristics for specific directions or regions, providing comprehensive coverage through targeted signal resources while reducing overall uplink resource consumption by avoiding redundant transmissions in all directions.
Data Source
AI summary
A method and apparatus for positioning in a mobile communication system are provided. Method for positioning includes receiving by a terminal from a base station a SIB1 comprising a first scheduling information and a second scheduling information, acquiring a SI based at least in part on the first scheduling information and the second scheduling information, transmitting to a LMF a RequestAssistanceData including an identifier related to the PRS data, receiving from the LMF a ProvideAssistanceData the ProvideAssistanceData includes a first PRS data and transmitting to the LMF a ProvideLocationInformation the ProvideLocationInformation comprises a first identifier related to the first PRS data and a time difference between one or more Transmission Reception Points (TRPs).