Sidelink Resource Selection With Multi-Occasion HARQ Feedback
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Solution Overview
Problem
In sidelink communication on unlicensed spectrum, there is no mechanism for selecting PSSCH resources when there is a one-to-many relationship between PSSCH and PSFCH, leading to resource waste and decoding failures due to channel access failures and receiving errors.
Innovation Solution
A resource selection method that allows one time of PSSCH transmission to correspond to multiple times of PSFCH transmission, ensuring a time gap between transmissions and adjusting the number of PSFCH feedback occasions based on HARQ feedback time and SCI indication limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If one time of PSSCH transmission corresponds to only one time of PSFCH feedback (one-to-one relationship), then the feedback mechanism is simple, but resource waste occurs due to excessive retransmission and channel access failures
Solution Approach 1:
The feedback mechanism is segmented by allowing one PSSCH transmission to correspond to multiple PSFCH feedback occasions (one-to-many relationship). This segmentation enables the system to provide multiple feedback opportunities for a single transmission, reducing resource waste from unnecessary retransmissions while maintaining manageable complexity through structured resource selection procedures.
2Productivity
If multiple PSFCH feedback occasions are provided for one PSSCH transmission, then resource waste is reduced, but the resource selection mechanism becomes more complex
Solution Approach 1:
The resource selection mechanism is made dynamic by enabling the system to adaptively choose from multiple PSFCH feedback occasions based on actual channel conditions and reception outcomes. The receiving end can dynamically select which feedback occasion to use for sending feedback, optimizing transmission efficiency while the standardized selection procedures keep implementation complexity manageable.
Solution Approach 2:
The one-to-many PSSCH-PSFCH relationship implements a feedback mechanism where multiple feedback occasions are provided, and the system uses feedback from these occasions to determine whether retransmission is needed. This feedback loop improves productivity by reducing unnecessary retransmissions, while the structured feedback procedures maintain acceptable device complexity.
3Reliability
If a time gap between consecutive PSSCH transmissions is executed according to related technology, then the feedback timing is simple, but the receiving end may cancel subsequent retransmission in case of receiving failure
Solution Approach 1:
The system performs preliminary action by pre-configuring multiple PSFCH feedback occasions before the actual feedback is sent. This allows the receiving end to have multiple opportunities to send feedback without canceling subsequent retransmissions, improving reliability by ensuring data decoding success while the pre-defined occasion structure keeps the mechanism complexity manageable.
4Adaptability or versatility
If one PSSCH transmission corresponds to multiple PSFCH transmissions, then multiple feedback opportunities are provided, but no PSSCH resource selection mechanism exists for this one-to-many relationship
Solution Approach 1:
The resource selection mechanism is designed with universality by creating a standardized procedure that works for the one-to-many PSSCH-PSFCH relationship. The same resource selection principles and procedures used in traditional one-to-one scenarios can be applied here, allowing the mechanism to handle both cases uniformly. This provides adaptability and flexibility for multiple feedback occasions while avoiding the need for entirely new complex selection mechanisms.
Data Source
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AI summary
The present invention relates to the technical field of communications, and provides a resource selection method and device suitable for a sidelink, and a user equipment. The method is applied to a first user equipment and comprises: performing resource selection in a resource pool supporting HARQ feedback, wherein the selected resources are used for a PSCCH transmission and a PSSCH transmission; and the correspondence between the PSSCH transmission and a PSFCH transmission comprises at least one of the following: one PSSCH transmission corresponds to M1 PSFCH transmissions located on different time units; and one PSSCH transmission at most corresponds to M2 PSFCH transmissions located on different time units, wherein M1 and M2 are configured or pre-configured positive integers, and a PSFCH is used for bearing HARQ feedback information.