Multiple PSFCH Symbols for Sidelink Reliability
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Solution Overview
Problem
Current wireless communication systems face limitations in sidelink transmission on sidelink carriers, particularly in licensed carrier scenarios, where only one PSFCH symbol is transmitted per period, leading to inefficiencies and potential data loss due to failed clear channel assessments.
Innovation Solution
The proposed solution involves determining multiple PSFCH symbols within a PSFCH period, allowing for additional PSFCH symbols to be transmitted while maintaining backward compatibility with the first PSFCH symbol. This is achieved by configuring the sidelink device to receive or determine the configuration of multiple PSFCH symbols, enabling resource mapping for extended PSFCH indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one PSFCH symbol is transmitted per period, then the system maintains simplicity and backward compatibility, but the reliability of sidelink communication deteriorates due to potential data loss from failed clear channel assessments
Solution Approach 1:
The PSFCH period is segmented to include multiple PSFCH symbols (first, second, and third symbols) instead of a single symbol. This segmentation allows the system to transmit multiple feedback opportunities within one period, thereby improving reliability by reducing the impact of failed clear channel assessments on any single PSFCH transmission.
Solution Approach 2:
The patent introduces dynamic configuration parameters including psfch-Period (controlling the period duration), numberOfPSFCH-Symbols (controlling the number of PSFCH symbols per period), and psfch-SymbolIndices (controlling the specific symbol positions). These dynamic parameters allow the system to adapt the PSFCH structure based on reliability requirements while managing complexity through configurable parameters.
2Reliability
If multiple PSFCH symbols are transmitted per period, then the reliability of ACK/NACK feedback improves, but the device complexity increases due to additional configuration and resource mapping requirements
Solution Approach 1:
The patent employs parameter changes to manage resource mapping complexity. By introducing configurable parameters such as psfch-Period, numberOfPSFCH-Symbols, and psfch-SymbolIndices, the system can adapt the number and position of PSFCH symbols without requiring fundamental changes to the resource mapping mechanism. This allows multiple PSFCH symbols to be transmitted while maintaining manageable complexity through parameter-based control.
Solution Approach 2:
The resource mapping mechanism is designed to be universal and multi-functional, capable of handling both single and multiple PSFCH symbols within the same period. The first PSFCH symbol maintains backward compatibility with existing systems, while additional symbols (second and third) can be configured as needed, allowing the same mapping infrastructure to serve multiple feedback scenarios without requiring separate specialized mechanisms.
3Productivity
If additional PSFCH symbols are configured, then the efficiency of sidelink communication enhances, but the difficulty of detecting and measuring PSFCH resources increases
Solution Approach 1:
The patent implements feedback mechanisms where the number of PSFCH symbols and their positions are configured through higher-layer parameters (psfch-Period, numberOfPSFCH-Symbols, psfch-SymbolIndices). This feedback-based configuration allows receiving devices to know in advance where to expect PSFCH resources, simplifying detection and measurement despite having multiple symbols per period. The systematic indexing and periodic structure provide clear feedback paths for resource identification.
Solution Approach 2:
The PSFCH resources are organized in a periodic structure defined by psfch-Period, with multiple symbols occurring at predictable intervals within each period. This periodic action creates a regular, detectable pattern that simplifies resource measurement and detection. The consistent periodic structure allows devices to efficiently identify PSFCH resources through timing relationships rather than requiring complex random access procedures.
Data Source
AI summary
Various aspects of the present disclosure relate to a sidelink device (e.g., a UE) that establishes a configuration of multiple physical sidelink feedback channel (PSFCH) symbols within a PSFCH period. The sidelink device transmits PSFCH information based on the multiple PSFCH symbols within the PSFCH period. To establish the configuration, the sidelink device can receive a signaling indicating the configuration of the multiple PSFCH symbols within the PSFCH period. Alternatively, to establish the configuration, the sidelink device determines the configuration of the multiple PSFCH symbols within the PSFCH period.