Sidelink PSFCH Interlace Allocation for Multiplexed UE Feedback
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Solution Overview
Problem
Existing sidelink communication systems lack efficient mechanisms for feedback channels, particularly in unlicensed frequency bands, limiting the ability of receiving UEs to provide comprehensive feedback information to transmitting UEs, such as decoding status and channel state information.
Innovation Solution
Implementing resource allocations for feedback channels using an interlace comprising multiple resource blocks to carry physical sidelink feedback channel (PSFCH) content, allowing for a set of resource elements within the interlace to include a first and second resource block, enabling multiplexing of feedback information from multiple UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional resource allocation methods are used for feedback channels in sidelink communications, then the system structure remains simple, but the spectral efficiency and feedback capability are limited
Solution Approach 1:
The feedback channel resources are segmented into multiple interlaces, where each interlace contains multiple resource blocks. This segmentation allows multiple UEs to be assigned to different interlaces or different resource blocks within interlaces, enabling efficient multiplexing of feedback information from multiple UEs while maintaining organized resource management structure
Solution Approach 2:
The patent introduces an additional dimension to resource allocation by organizing feedback resources in an interlace structure that spans multiple resource blocks in the frequency domain. This dimensional expansion allows for more flexible and efficient resource utilization, improving spectral efficiency by enabling better multiplexing opportunities across the frequency spectrum
2Reliability
If dedicated feedback channels are allocated for each UE, then feedback reliability is improved, but resource overhead and system complexity increase
Solution Approach 1:
Multiple UEs share common feedback channel resources through the interlace structure, where multiple resource blocks within an interlace can be allocated to different UEs for feedback transmission. This merging approach reduces overall resource overhead compared to dedicated channels for each UE while maintaining reliable feedback capability through structured resource sharing and multiplexing
Data Source
AI summary
Some aspects of this disclosure relate to apparatuses and methods for implementing resource allocations for feedback channels in sidelink communications. A UE can be configured to receive a physical sidelink control channel (PSCCH) transmission or a physical sidelink shared channel (PSSCH) transmission over a sidelink between the UE and a second UE for sidelink communication. The UE can allocate a set of resource elements within an interlace including multiple resource blocks to carry physical sidelink feedback channel (PSFCH) content associated with the received PSCCH transmission or PSSCH transmission, where the set of resource elements includes a first resource element in a first resource block of the interlace, and a second resource element in a second resource block of the interlace. The UE can be further configured to transmit the PSFCH content carried by the set of resource elements as a PSFCH transmission to the second UE.