5G UE Beam Selection for Positioning Reference Signal Alignment
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Solution Overview
Problem
In 5G wireless communication systems, the existing OTDOA-based positioning methods face challenges due to the directional nature of PRS signals, leading to increased positioning calculation delays and reduced accuracy when base stations operate in high frequency bands, as the PRS may not cover all directions, and beam alignment between the UE and base stations is not timely or accurate.
Innovation Solution
A method that involves transmitting information to determine specific antenna ports for beam selection, using Angle of Arrival (AoA) measurements, and reporting beamforming vectors to optimize the alignment of positioning reference signals, allowing for omnidirectional sweeping and improving positioning accuracy by aligning the UE with the correct transmission direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If PRS transmits in the Sweeping manner to all directions, then the coverage is improved, but the positioning calculation delay increases
Solution Approach 1:
The UE performs beam selection and reports beam selection information to the base station before positioning measurement. The base station uses this information to pre-determine the transmission direction for PRS, avoiding the need to sweep through all directions during positioning measurement. This preliminary action of beam selection enables the system to jump directly to the relevant beam direction, significantly reducing positioning calculation delay while maintaining adequate coverage.
Solution Approach 2:
The UE autonomously performs beam selection and reports the results to the base station. The base station then autonomously determines the PRS transmission direction based on the reported beam selection information. This self-service mechanism allows the system to adapt to directional transmission requirements without manual intervention, efficiently resolving the contradiction between coverage and delay.
2Area of stationary object
If PRS transmits in the Sweeping manner to all directions, then the coverage is improved, but the positioning accuracy deteriorates
Solution Approach 1:
Beam selection is performed before positioning measurement to identify the optimal transmission direction. The base station uses the beam selection information to pre-determine the PRS transmission direction, ensuring that positioning measurements are taken along the most accurate path rather than sweeping through all directions. This preliminary beam selection action maintains positioning accuracy while providing sufficient coverage.
Solution Approach 2:
Instead of treating all directions equally during positioning measurement, the system applies local quality by concentrating measurement resources on the specific direction identified through beam selection. The base station transmits PRS primarily in the direction indicated by beam selection results, allocating measurement quality locally to the most relevant direction rather than distributing it uniformly across all directions.
3Measurement precision
If beam selection information is used to determine PRS transmission direction, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The UE autonomously performs beam selection and reports results to the base station, which then autonomously determines PRS transmission direction. This self-service approach allows the system to achieve accurate positioning through distributed intelligence at the UE and base station, rather than requiring complex centralized control. The complexity is distributed and managed through standardized reporting mechanisms, making the system manageable despite the enhanced functionality.
Solution Approach 2:
The UE reports beam selection information as feedback to the base station, which uses this feedback to determine the optimal PRS transmission direction. This feedback mechanism creates a closed-loop system where positioning accuracy is improved through iterative optimization. The feedback-based approach manages complexity by using simple reporting structures that convey essential directional information without requiring complex data exchange or processing.
Data Source
AI summary
A method and device for a user equipment, a base station and a service center is disclosed; the UE transmits first information, then receives X1 first signals and transmits a first measurement report; first information is used to determine X1 first antenna port(s); first measurement report includes K1 piece(s) of measurement information, and each of K1 piece(s) of measurement information is for one of X1 first signals; measurement information is used to determine at least the first two of the corresponding set of time length, first antenna port, or first angle; By designing first information and first measurement report, feedback information of beam selection is used to determine generation and transmission of positioning reference signal under the condition of the base station and the UE supporting beamforming, utilizing beamforming has strong directional characteristics to improve the accuracy of UE positioning.