Sidelink Control Information Bandwidth Selection
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Solution Overview
Problem
In sidelink communication scenarios for V2X technology, the high complexity of blind detection for control information at the receiver is caused by the need to check all possible frequency-domain positions occupied by control information, due to the same frequency-domain resources being used for both control and user data, leading to increased processing delay and buffer consumption.
Innovation Solution
The transmitter selects a second frequency-domain bandwidth for control information from a set of candidate bandwidths based on the first frequency-domain bandwidth occupied by user data, reducing the number of possible positions for control information, thereby simplifying blind detection at the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same frequency-domain resources are used for control information and user data, then resource utilization is improved, but the complexity of blind detection at the receiver increases
Solution Approach 1:
The frequency domain is segmented into multiple candidate bandwidths, and the control information bandwidth is selected from a predefined set of discrete options. This segmentation allows the receiver to limit blind detection to specific frequency positions corresponding to these discrete bandwidths, reducing detection complexity while maintaining flexible resource allocation.
Solution Approach 2:
The control information bandwidth is changed from a continuous variable to a discrete parameter selected from a predefined set of candidate bandwidths. This parameter discretization enables the receiver to perform blind detection at limited frequency positions, reducing complexity while preserving adaptive resource allocation capabilities.
2Measurement precision
If blind detection is performed on all possible frequency-domain positions, then detection accuracy is improved, but processing delay increases
Solution Approach 1:
The frequency domain is divided into discrete candidate bandwidths, which segments the search space for blind detection. The receiver only needs to detect at specific frequency positions corresponding to these segmented bandwidths, reducing the number of detection operations required while maintaining detection accuracy.
Solution Approach 2:
Instead of performing blind detection on all possible frequency positions, the receiver performs partial detection only at frequency positions corresponding to the predefined candidate bandwidths. This partial action approach maintains sufficient detection accuracy while significantly reducing processing delay.
3Reliability
If blind detection is performed on all possible frequency-domain positions, then detection completeness is improved, but buffer consumption increases
Solution Approach 1:
The frequency domain resources are segmented into discrete candidate bandwidths, which limits the number of frequency positions where control information may be located. This segmentation reduces the buffer space required at the receiver to store and process potential control information candidates, while maintaining detection completeness through the predefined bandwidth set.
Data Source
AI summary
A control information sending method and a control information receiving method include: a transmitter determining a first frequency-domain bandwidth occupied by user data to be sent; the transmitter selecting, according to the first frequency-domain bandwidth, from n candidate frequency-domain bandwidths, a second frequency-domain bandwidth occupied by control information corresponding to the user data, wherein n is an integer greater than 1; the transmitter sending the control information to a receiver according to the second frequency-domain bandwidth; the receiver determining that the transmitter sends the n candidate frequency-domain bandwidths of the control information; and the receiver performing blind detection on the control information according to the n candidate frequency-domain bandwidths.