UL-PRS Beam Selection Using Expected UL-AoA for Accurate Positioning
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Solution Overview
Problem
Existing wireless communication systems lack the ability to effectively indicate the expected uplink angle of arrival (UL-AoA) to terminals for improved positioning efficiency, particularly in scenarios requiring high accuracy and low latency.
Innovation Solution
A terminal is equipped with a reception unit to receive information on the expected UL-AoA from a base station, a control unit to determine the appropriate beam for UL-PRS transmission, and a transmission unit to apply the determined beam for UL-PRS, enhancing positioning efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal transmits UL-PRS using multiple beams to ensure positioning accuracy, then positioning accuracy is improved, but power consumption and resource usage increase
Solution Approach 1:
The base station provides advance information about the expected UL-AoA (Uplink Angle of Arrival) to the terminal before positioning measurement. The terminal uses this preliminary information to pre-determine which beam should be used for UL-PRS transmission, eliminating the need to try multiple beams and reducing power consumption while maintaining positioning accuracy
Solution Approach 2:
The base station receives feedback information about the expected UL-AoA from the network side and uses this feedback to guide the terminal's beam selection. This feedback mechanism allows the terminal to align its transmission beam with the expected angle of arrival, optimizing positioning performance while reducing unnecessary energy expenditure
2Device complexity
If the terminal uses a fixed beam configuration for UL-PRS transmission, then device complexity is reduced, but positioning accuracy deteriorates when terminal moves
Solution Approach 1:
Instead of using a fixed beam configuration, the terminal dynamically selects the appropriate beam based on real-time positioning information about the expected UL-AoA provided by the base station. This dynamic adaptation allows the terminal to maintain positioning accuracy during movement while avoiding the complexity of managing multiple fixed beam configurations
Solution Approach 2:
The terminal changes its beam direction parameter based on the expected UL-AoA information received from the base station. By adjusting the beam parameter according to the anticipated angle of arrival, the terminal maintains positioning accuracy without requiring complex multi-beam switching mechanisms
3Ease of operation
If the terminal transmits UL-PRS without beam selection, then ease of operation is improved, but positioning efficiency deteriorates
Solution Approach 1:
The terminal autonomously determines the appropriate beam for UL-PRS transmission by using the expected UL-AoA information provided by the base station. This self-service approach eliminates the need for manual beam selection operations while significantly improving positioning efficiency through optimized beam alignment
Data Source
AI summary
A terminal includes: a reception unit configured to receive information indicating an expected angle of UL-AoA (Uplink Angle of Arrival) from a base station; a control unit configured to determine a beam to be applied to UL-PRS (Positioning Reference Signal), based on the information indicating the expected angle of UL-AoA; and a transmission unit configured to transmit the UL-PRS by applying the determined beam.