NR V2X Sidelink Control Split for Lower UE Processing Complexity
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Solution Overview
Problem
The existing wireless communication systems face limitations in DCI and SCI format sizes, leading to increased complexity and inefficiencies in UE processing, particularly in sidelink communications for V2X scenarios.
Innovation Solution
A method involving the reception of a physical sidelink control channel (PSCCH) with first sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH), followed by transmitting hybrid automatic repeat request (HARQ) feedback through a physical sidelink feedback channel (PSFCH) based on the format of the second SCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If DCI and SCI format sizes are increased to accommodate more control information, then the information capacity is improved, but the UE processing complexity increases
Solution Approach 1:
The control information is divided into two separate SCI formats (SCI format 0-2 for scheduling and SCI format 0-3 for HARQ feedback) transmitted on different channels (PSCCH and PSSCH). This segmentation allows the receiving UE to process control information in stages, reducing the peak complexity of simultaneous processing while maintaining comprehensive control information capacity.
Solution Approach 2:
The patent introduces a temporal dimension by transmitting control information across multiple time slots and channels. The first SCI on PSCCH is received before the second SCI on PSSCH, allowing progressive decoding and reducing the instantaneous processing burden on the UE while maintaining complete control information delivery.
2Adaptability or versatility
If multiple SCI formats are used to support diverse V2X scenarios, then the adaptability is improved, but the UE complexity increases
Solution Approach 1:
The patent implements dynamic SCI format selection where the transmitting UE can choose between SCI format 0-2 and SCI format 0-3 based on the specific V2X scenario requirements (e.g., groupcast with HARQ feedback vs. broadcast). The receiving UE adapts its processing based on the received format type, enabling flexible support for multiple scenarios while maintaining manageable complexity through conditional processing logic.
Solution Approach 2:
Different SCI formats use different parameter sets and field configurations optimized for their specific purposes. SCI format 0-2 includes fields optimized for scheduling information while SCI format 0-3 includes fields optimized for HARQ feedback. This parameter differentiation allows the system to adapt to various V2X scenarios by changing the active format rather than maintaining all possibilities simultaneously in one format.
3Reliability
If control information is transmitted with higher reliability for V2X safety services, then the reliability is improved, but the transmission overhead increases
Solution Approach 1:
The patent uses the PSCCH as an intermediary channel to deliver critical scheduling control information (SCI format 0-2) before the actual data transmission on PSSCH. This intermediary approach ensures that receiving UEs can prepare appropriate reception parameters and HARQ processes in advance, improving reliability without requiring redundant transmission of all control information in the main data channel.
Solution Approach 2:
The transmitting UE performs preliminary control information delivery through SCI format 0-2 on PSCCH, which contains scheduling parameters that enable receiving UEs to prepare for subsequent PSSCH reception. This preliminary action includes configuring HARQ process parameters, resource allocation, and modulation schemes in advance, ensuring reliable reception without requiring excessive overhead in the main data transmission.
Data Source
AI summary
A method for performing wireless communication by a first device and a device for supporting same are provided. The method may include receiving, from a second device, a physical sidelink control channel (PSCCH) including a first sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH); receiving, from the second device, the PSSCH including a second SCI; and transmitting, to the second device, a hybrid automatic repeat request (HARQ) feedback through a physical sidelink feedback channel (PSFCH) in response to the PSSCH based on a format of the second SCI.