SCI Resource Indication for Three PSSCHs in NR-V2X
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Solution Overview
Problem
The existing SCI in LTE-V2X and NR-V2X technologies can only indicate time-frequency locations of a maximum of two PSSCHs, which is insufficient to meet the requirements of NR-V2X.
Innovation Solution
The proposed communications method and apparatus enable the SCI to indicate time-frequency locations of a maximum of three PSSCHs by using a first terminal apparatus to determine control information that includes specific fields indicating the quantity and start indices of frequency domain units for three data channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the SCI indicates time-frequency locations of a maximum of two PSSCHs (LTE-V2X existing capability), then the device complexity is low and the signaling overhead is small, but the adaptability to NR-V2X requirements is insufficient
Solution Approach 1:
The frequency domain resource indication is segmented into multiple parts: a first resource indication value indicating the quantity of frequency domain units, a second resource indication value indicating the start frequency domain unit index of the second data channel, and a third resource indication value indicating the start frequency domain unit index of the third data channel. This segmentation allows the SCI to indicate up to three PSSCHs by dividing the resource indication into discrete, manageable components that can be independently decoded.
Solution Approach 2:
The patent extends the resource indication from two dimensions (time and frequency) to include an additional dimension of multiplicity by indicating three distinct data channels. The frequency domain indication is enhanced by adding multiple start indices (first, second, third data channels) rather than a single start index, effectively using another dimension in the resource allocation space to accommodate more channels.
2Adaptability or versatility
If the SCI indicates time-frequency locations of a maximum of two PSSCHs (existing SCI capability), then the signaling overhead is small, but the capacity to support NR-V2X is insufficient
Solution Approach 1:
Multiple resource indication functions are merged into a unified SCI structure. The first resource indication value (quantity of frequency domain units), second resource indication value (start index of second data channel), and third resource indication value (start index of third data channel) are combined in a single control message, allowing the indication of three PSSCHs without requiring separate signaling for each channel.
Solution Approach 2:
The SCI is designed with multi-functionality to support both LTE-V2X and NR-V2X requirements. The resource indication fields are configured to be universal: the first resource indication value can indicate quantities for 1-3 data channels, and the second and third resource indication values provide start indices for additional channels when needed, making the SCI structure adaptable to different V2X scenarios.
Data Source
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AI summary
Embodiments of this application relate to the communications field, and disclose a communications method. SCI can indicate time-frequency locations of a maximum of three PSSCHs, which can meet a requirement of NR-V2X. The method includes: A first terminal apparatus determines control information, where the control information includes a first field, and a value of the first field is used to indicate a quantity of first frequency domain units, a first start frequency domain unit index, and a second start frequency domain unit index; and the quantity of first frequency domain units is a quantity of frequency domain units included in a first data channel, a second data channel, or a third data channel, the first start frequency domain unit index is a start frequency domain unit index of the second data channel, and the second start frequency domain unit index is a start frequency domain unit index of the third data channel. The first terminal apparatus sends the control information and the first data channel to a second terminal apparatus in a first time unit.