Shared-COT PSFCH Feedback for Sidelink Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting sidelink transmission and reception in unlicensed or shared spectra, particularly in managing physical sidelink feedback channels (PSFCH) due to resource constraints and interference, which hinders efficient data transmission and reception.
Innovation Solution
A method and apparatus for sidelink transmission and reception in unlicensed or shared spectra, involving the determination of slots and resources for PSFCH transmission and reception, including the use of hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information, to stabilize and expedite PSFCH operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PSFCH transmission is performed in unlicensed or shared spectrum, then sidelink communication capability is improved, but resource constraints and interference increase
Solution Approach 1:
The transmitting UE performs channel access procedure and acquires channel occupancy time (COT) before PSFCH transmission. The COT is shared with the receiving UE, allowing the PSFCH to be transmitted within the pre-acquired channel occupancy period without requiring additional channel access, thus resolving resource constraints in unlicensed spectrum
Solution Approach 2:
The system uses the existing COT structure and sharing mechanism to accommodate PSFCH transmission. The receiving UE utilizes the shared COT for PSFCH transmission, and the transmitting UE determines ACK/NACK timing based on the shared COT structure, enabling self-sufficient operation without additional network coordination
2Reliability
If additional channel access is performed for PSFCH transmission, then channel access compliance is improved, but transmission speed decreases
Solution Approach 1:
The PSFCH transmission is merged with the existing COT structure. The receiving UE transmits PSFCH within the shared COT period, combining the channel access procedure with the data transmission opportunity. This eliminates the need for separate channel access for PSFCH, maintaining compliance while improving transmission speed
Solution Approach 2:
The channel access procedure is performed preliminarily by the transmitting UE before data transmission. The acquired COT is then shared with the receiving UE for PSFCH transmission, allowing the feedback channel to use the pre-acquired channel occupancy without performing additional channel access
3Adaptability or versatility
If PSFCH transmission timing is flexible, then adaptation to COT structure is improved, but determination complexity increases
Solution Approach 1:
The ACK/NACK transmission timing is determined by changing parameters related to the shared COT structure. The transmitting UE configures the timing based on COT parameters, and the receiving UE determines PSFCH transmission timing based on the shared COT information, allowing flexible adaptation through parameter adjustment rather than complex logic
Solution Approach 2:
The system establishes feedback mechanisms where the transmitting UE indicates COT sharing information to the receiving UE, and the receiving UE determines PSFCH timing based on this feedback. This structured feedback approach simplifies the determination process compared to autonomous complex decision-making
Data Source
AI summary
A method and a device for sidelink transmission or reception in a wireless communication system are disclosed. A method performed in a shared spectrum according to an embodiment of the present disclosure may comprise the steps of: receiving configuration information related to a PSFCH; receiving SCI for scheduling a PSSCH; receiving the PSSCH on the basis of the SCI; and as a response to the PSSCH, transmitting the PSFCH including HARQ-ACK information.