Sidelink Positioning Reference Signal Resource Allocation With AGC Training
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Solution Overview
Problem
Current sidelink (SL) communication systems lack effective methods for positioning reference signal (PRS) transmission, particularly in 3GPP Rel-16/17, where SL positioning was not considered, and standardization for SL positioning is only defined in 3GPP Rel-18, necessitating a slot structure for PRS transmission to achieve required accuracy.
Innovation Solution
The proposed method involves time and frequency resource allocation for PRS transmissions using a dedicated resource pool, where a first user equipment (UE) detects SL control information of a second UE and allocates resources for PRS symbols, with automatic gain control (AGC) training separating resources to ensure accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL-PRS resources are allocated without AGC training separation, then resource utilization is high, but positioning accuracy deteriorates due to gain control interference
Solution Approach 1:
The slot structure is segmented into distinct regions: SL-PRS resources from first UEs, AGC training symbols, and SL-PRS resources from second UEs. This segmentation separates positioning reference signals from automatic gain control training, preventing interference and ensuring accurate positioning measurements while maintaining efficient resource utilization through structured allocation.
2Measurement precision
If multiple UEs transmit SL-PRS simultaneously without resource separation, then communication efficiency is high, but measurement precision deteriorates due to signal interference
Solution Approach 1:
AGC training symbols act as an intermediary element between SL-PRS transmissions from different UEs. This intermediary allows the receiver to properly calibrate gain levels before measuring positioning reference signals, eliminating interference effects and enabling accurate simultaneous or sequential PRS measurements from multiple UEs.
3Measurement precision
If SL positioning is implemented without defined slot structure, then system flexibility is maintained, but positioning accuracy deteriorates due to lack of standardized resource allocation
Solution Approach 1:
The patent defines specific parameters for slot structure including slot duration, subcarrier spacing, cyclic prefix length, and resource element patterns for SL-PRS transmission. These standardized parameter definitions enable consistent and accurate positioning measurements across different UEs while maintaining reasonable system complexity through established communication protocol parameters.
Data Source
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AI summary
A method and a device are provide in which a first user equipment (UE) detects first sidelink (SL) control information (SCI) of a second UE. The first UE allocates a first resource in a slot for SL positioning reference signal (PRS) symbols of the first UE, based on the first SCI. A second resource of the slot is for SL-PRS symbols of the second UE. The first resource and the second resource are separated by a first symbol for automatic gain control (AGC) training for subsequent SL-PRS symbols.