SL-PRS Comb Pattern AGC Training for Precise Sidelink Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the gain control for sidelink positioning reference signals (SL-PRS), which affects the precision of vehicle-to-everything (V2X) communication technologies, particularly in 5G networks.
Innovation Solution
Implementing a comb pattern for sidelink positioning reference signals (SL-PRS) with a repeating subset of symbols configured for automatic gain control (AGC) training, allowing for precise gain adjustment during transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional wireless communication systems are used without AGC training, then the system structure is simpler, but the gain control accuracy for SL-PRS is insufficient
Solution Approach 1:
The patent applies preliminary action by inserting AGC training symbols before the actual SL-PRS transmission. These training symbols enable the receiver to calibrate the automatic gain control circuitry in advance, ensuring accurate signal amplification and measurement precision for subsequent positioning reference signals without requiring complex real-time adjustment mechanisms.
Solution Approach 2:
The patent uses AGC training symbols as an intermediary element between the transmitter and the SL-PRS. These training symbols serve as a mediator that enables the receiver to estimate and compensate for channel gain variations, thereby achieving accurate gain control for positioning measurements without directly complicating the main SL-PRS transmission structure.
2Measurement precision
If AGC training is implemented with comb pattern, then the positioning precision is improved, but the signal transmission time is increased
Solution Approach 1:
The patent applies segmentation by dividing the SL-PRS transmission into distinct parts: AGC training symbols and actual SL-PRS symbols. The training symbols are transmitted in separate time slots using a comb pattern, allowing the receiver to perform gain calibration without interfering with the main positioning signal transmission. This segmentation enables precise positioning while minimizing time overhead by keeping training symbols compact and structured.
Solution Approach 2:
The patent utilizes periodic action through the comb pattern structure, where AGC training symbols are transmitted at regular intervals within the SL-PRS resource. This periodic arrangement allows efficient use of time-frequency resources, enabling the receiver to capture training symbols at optimal intervals for accurate gain control while maintaining overall transmission efficiency and minimizing time loss.
3Productivity
If comb pattern with repeating subset of symbols is used, then the AGC training efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the comb pattern with repeating subsets of symbols that serve multiple functions. The same structural pattern used for AGC training can also be utilized for positioning reference signal transmission, allowing the system to achieve efficient gain control while maintaining signal transmission capabilities. This multi-functionality reduces the need for separate complex training sequences and signaling mechanisms.
Solution Approach 2:
The patent utilizes parameter changes by varying the comb pattern configuration based on transmission requirements. The repeating subset of symbols can be adjusted in terms of frequency spacing, time positioning, and symbol duration to optimize AGC training efficiency for different channel conditions. This flexibility allows the system to adapt to varying operational scenarios without requiring fundamentally different training mechanisms, thereby managing device complexity through parameter optimization rather than structural complexity.
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) transmits a subset of symbols of a set of symbols of a sidelink positioning reference signal (SL-PRS) resource, and transmits the set of symbols of the SL-PRS resource, including the subset of symbols, wherein the set of symbols is transmitted after the subset of symbols.