Second PSCCH Resource Mapping from PSSCH DMRS
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Solution Overview
Problem
Existing V2X communication systems face challenges in configuring transmission resources for second-order physical sidelink control channels (PSCCH) due to the lack of clear methods for determining these resources, leading to increased complexity and latency in blind detection by receivers.
Innovation Solution
A method and apparatus for determining sidelink transmission resources, including a third transmission resource for PSSCH and a second transmission resource adjacent to the DMRS of PSSCH, specifically designed for transmitting second SCI, with configurations based on information fields in first SCI to optimize resource allocation and reduce detection complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the transmitter uses a transmission resource for PSSCH to transmit PSCCH, then spectrum efficiency is improved, but the complexity of detecting the second PSCCH by the receiver increases due to lack of clear resource configuration
Solution Approach 1:
The patent applies preliminary action by pre-configuring the transmission resource for the second PSCCH based on the DMRS resource of the PSSCH. The receiver can predict the second PSCCH location using the formula n_secondPSCCH = n_DMRS + offset, where the offset is predetermined. This eliminates the need for blind detection across multiple possible locations, thereby reducing detection complexity while maintaining spectrum efficiency.
2Loss of information
If the first PSCCH carries information for blind detection, then the receiver can obtain demodulation information, but the transmission latency increases due to lack of precise resource indication for the second PSCCH
Solution Approach 1:
The patent introduces an intermediary mechanism where the DMRS resource location serves as a reference point to determine the second PSCCH location. By using the DMRS position (which is already known from PSSCH configuration) and adding a predetermined offset, the system efficiently bridges the gap between information availability and resource location prediction, reducing latency without losing demodulation information.
3Adaptability or versatility
If no clear method is provided for configuring the second PSCCH transmission resource, then flexibility is maintained, but the receiver cannot efficiently locate the second PSCCH leading to increased detection time
Solution Approach 1:
The patent applies parameter changes by establishing a deterministic relationship between the DMRS resource parameter (n_DMRS) and the second PSCCH resource parameter (n_secondPSCCH) through a predefined offset. This parameter transformation allows the receiver to calculate the exact location of the second PSCCH without exhaustive search, thereby reducing detection time while preserving configuration flexibility through the offset parameter.
Data Source
AI summary
A method for determining a sidelink transmission resource, a terminal device, and a network device are provided. The method includes determining a third transmission resource that includes a transmission resource for transmitting a physical sidelink shared channel (PSSCH), and determining a second transmission resource in the third transmission resource. The second transmission resource includes a time-domain resource the same as and/or adjacent to a time-domain resource for a demodulation reference signal (DMRS) of the PSSCH. The second transmission resource is used for transmitting second sidelink control information (SCI). The third transmission resource further includes a first transmission resource for transmitting first SCI.