Sidelink PRS Symbol Scheduling for PT-RS-Aware Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving high data rates, low latency, and reliable connectivity, especially in emerging technologies like 6G, which require advanced positioning methods for devices and vehicles.
Innovation Solution
The implementation of phase-tracking reference signals (PT-RS) for sidelink (SL) positioning, including SL PRS transmission, with cancellation in specific symbols to enhance positioning accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase-tracking reference signals (PT-RS) are transmitted for sidelink positioning, then positioning accuracy is improved, but transmission time resources are reduced due to cancellation in specific symbols
Solution Approach 1:
The transmission time resources are segmented into different symbols: some symbols are dedicated for PT-RS transmission for positioning, while other symbols are used for data transmission. This segmentation allows positioning functionality to be achieved without completely sacrificing transmission time resources, as the system can utilize available time-frequency resources efficiently for both positioning and data communication.
Solution Approach 2:
The PT-RS is transmitted periodically in specific symbols according to configured patterns. This periodic transmission allows the receiving device to accumulate positioning information over multiple periods, improving positioning accuracy while distributing the time resource consumption across multiple transmission cycles rather than requiring continuous time resource allocation.
2Reliability
If PT-RS transmission is implemented for positioning, then positioning reliability is improved, but device complexity increases due to additional configuration and cancellation requirements
Solution Approach 1:
The PT-RS transmission configuration is performed in advance through higher layer signaling before actual positioning operations. The network device pre-configures the PT-RS parameters, including which symbols should be cancelled for PT-RS transmission, allowing the user equipment to follow predetermined procedures during execution, thereby reducing real-time decision complexity.
Solution Approach 2:
The network device provides feedback information to the user equipment about the PT-RS transmission configuration and cancellation patterns. This feedback mechanism ensures that both devices have synchronized understanding of the transmission protocol, reducing errors and complexity in implementing the PT-RS cancellation in specific symbols.
3Measurement precision
If PT-RS cancellation in specific symbols is applied, then positioning performance is improved, but data transmission efficiency is reduced due to lost time resources
Solution Approach 1:
The available transmission time resources are segmented into different functional portions: certain symbols are allocated for PT-RS transmission to ensure positioning performance, while other symbols are dedicated for data transmission to maintain data transmission efficiency. This segmentation allows the system to optimize for both positioning and data transmission without requiring complete sacrifice of one for the other.
Solution Approach 2:
Instead of cancelling PT-RS transmission in all symbols, the system applies partial cancellation only in specific symbols where positioning is prioritized. This partial action approach maintains positioning performance while preserving data transmission efficiency in symbols where data transmission is the primary function, achieving a balanced optimization.
Data Source
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AI summary
Proposed are a method for a first device to perform wireless communication and a device supporting same. For example, the first device may obtain information related to phase-tracking reference signal (PT-RS) transmission. For example, the first device may obtain information related to SL PRS, including at least one of information related to SL (sidelink) PRS (positioning reference signal) resource ID (identity), information related to SL PRS comb offset, information related to SL PRS comb size, information related to SL PRS starting symbol, or information related to number of SL PRS symbols. For example, the first device may perform SL PRS transmission, based on the information related to the SL PRS. For example, the PT-RS transmission is cancelled in a symbol in which the SL PRS is transmitted.