Double Differential Timing Positioning Shared Requirements
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Solution Overview
Problem
Current wireless communication systems, particularly in the transition to 5G, face challenges in accurately estimating the position of user equipment (UE) due to complexities in timing measurements and signal propagation, which affect spectral efficiency and latency.
Innovation Solution
A method is introduced that involves determining shared requirements for both differential timing procedures, including timing and radio frequency chain requirements, to facilitate a double differential timing (DDT) procedure, enabling precise positioning estimates by transmitting specific requests to UE and reference wireless nodes for measurement and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If double differential timing procedure is implemented for position estimation, then positioning accuracy is improved, but device complexity and procedure overhead increase
Solution Approach 1:
The DDT procedure is segmented into two separate DT procedures: a first DT procedure executed by the target UE between the target UE and first/second wireless nodes, and a second DT procedure executed by the reference wireless node between the reference wireless node and the first/second wireless nodes. This segmentation allows each procedure to be independently managed and processed, reducing overall procedural complexity while maintaining positioning accuracy through the combination of both measurement results.
2Productivity
If shared requirements are standardized for DDT procedures, then spectral efficiency is improved, but timing and RF chain constraint management becomes more complex
Solution Approach 1:
The position estimation entity determines and transmits shared requirements for both DT procedures before the procedures are executed. These shared requirements include timing requirements (such as timing windows for RS-P measurements) and RF chain requirements (such as using the same RF chain for both procedures). By establishing these constraints in advance, the system enables coordinated resource allocation and reduces timing conflicts, thereby improving spectral efficiency while making constraint management more tractable through upfront planning.
3Measurement precision
If timing windows are configured for RS-P measurements in DDT procedures, then measurement precision is improved, but latency increases
Solution Approach 1:
The system configures periodic timing windows for RS-P measurements in both the first and second DT procedures. These periodic timing windows are scheduled at regular intervals, allowing the system to capture timing measurements at multiple opportunities. The position estimation entity can select the most accurate measurements from these periodic windows, improving timing measurement precision while managing latency by utilizing the periodic nature of the measurements rather than requiring continuous monitoring.
Data Source
AI summary
In an aspect, a position estimation entity (e.g., LMF) determines at least one shared requirement (e.g., a timing requirement, an RF chain requirement, etc.) for both of a first differential timing (DT) procedure of a double differential timing (DDT) procedure (e.g., TDOA-based or RTT-based) and a second DT procedure of the DDT procedure, the first DT procedure based on timing measurements between a target user equipment (UE) and first and second wireless nodes, and the second DT procedure based on timing measurements between a reference wireless node and the first and second wireless nodes, and transmits, to at least the target UE and the reference wireless node, requests to perform the DDT procedure along with an indication of the at least one shared requirement for the DDT procedure.