PRS QCL Association for Positioning Precision
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Solution Overview
Problem
Current downlink positioning scenarios using periodic positioning reference signals (PRS) fail to meet required positioning precision for terminal devices.
Innovation Solution
The method involves sending a first PRS with a quasi co-location (QCL) association relationship to a terminal device, along with identifying information and PRS identification information, allowing the terminal device to receive additional PRS types such as aperiodic or semi-persistent PRS, improving positioning precision by utilizing spatial characteristic parameters of existing PRS for location measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If periodic PRS is used for positioning, then the system operation is simple, but the positioning precision is insufficient
Solution Approach 1:
The patent combines multiple PRS types (periodic PRS, aperiodic PRS, and semi-persistent PRS) into a unified positioning system. The access network device sends both periodic PRS and aperiodic/semi-persistent PRS to the terminal device, allowing the terminal to perform location measurements using multiple PRS resources. This merging of different PRS types resolves the contradiction by achieving higher positioning precision through diverse PRS options while maintaining manageable system complexity through standardized handling procedures.
Solution Approach 2:
The patent introduces dynamic PRS transmission by allowing the access network device to send aperiodic and semi-persistent PRS in addition to periodic PRS. The network can dynamically select and configure different PRS types based on positioning requirements, terminal capabilities, and network conditions. This dynamic approach enables the system to adapt positioning precision to specific needs without permanently increasing system complexity.
2Measurement precision
If aperiodic PRS is sent to improve positioning precision, then more PRS resources are available for measurement, but the terminal device needs to re-determine spatial characteristic parameters
Solution Approach 1:
The patent applies preliminary action by pre-configuring QCL association relationships between periodic PRS and aperiodic/semi-persistent PRS. The access network device sends QCL indication information to the terminal device in advance, establishing the spatial characteristic parameter associations before actual positioning measurements are needed. This preliminary configuration allows the terminal to directly use pre-determined spatial parameters for aperiodic PRS reception, eliminating the need for real-time parameter determination and reducing time loss.
3Measurement precision
If multiple PRS types are transmitted, then positioning precision improves, but the information management complexity increases
Solution Approach 1:
The patent introduces QCL indication information as an intermediary that bridges the gap between multiple PRS types and the terminal device. This intermediary carries essential spatial characteristic parameter associations, allowing the terminal to efficiently manage information about multiple PRS resources without being overwhelmed by complexity. The QCL indication acts as a standardized interface that simplifies information management while enabling the use of diverse PRS types for high-precision positioning.
Data Source
AI summary
This application provides a positioning reference signal sending method and a related apparatus. The method includes: receiving identification information, positioning reference signal (PRS) indication information, and PRS identification information of a terminal device from a location management function network element; sending the PRS identification information to the terminal device; and sending a first PRS to the terminal device. Based on the foregoing technical solutions, the terminal device may receive a PRS of another type other than a periodic PRS. Therefore, more PRSs are used for location measurement. In this way, positioning precision can be improved.