PSFCH Resource Mapping for Sidelink Feedback Reliability
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Solution Overview
Problem
In wireless communication networks, particularly in unlicensed spectrum bands, there is a challenge in determining the appropriate resources for Physical Sidelink Feedback Channel (PSFCH) transmissions, leading to potential signal collisions and interference.
Innovation Solution
The method involves determining the total number of PSFCH interlaces over one resource block set in each PSFCH periodicity, allocating a PSFCH interlace for corresponding PSSCH or PSCCH transmissions, and determining the number of PSFCH resources available for multiplexing HARQ-ACK information, thereby optimizing PSFCH resource mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSFCH resources are allocated without proper resource mapping techniques, then resource allocation is simple, but signal collisions and interference occur leading to reduced reliability
Solution Approach 1:
The patent segments PSFCH resources into multiple interlaces within a resource block set, where each interlace contains specific subcarriers spaced at regular intervals. This segmentation allows different PSSCH transmissions to be mapped to different interlaces, reducing signal collisions and improving PSFCH reception reliability while maintaining organized resource structure.
Solution Approach 2:
The patent introduces an interlace dimension for PSFCH resource organization, transforming the traditional flat resource allocation into a multi-dimensional structure with interlaces and subcarriers. This dimensional change enables more granular resource allocation and reduces collisions by distributing PSFCH transmissions across multiple frequency dimensions.
2Manufacturing precision
If PSFCH interlaces are naturally indexed and allocated for corresponding PSSCH resources, then resource allocation precision is improved, but the complexity of determining indices increases
Solution Approach 1:
The patent establishes preliminary indexing rules for PSFCH interlaces that are naturally indexed from 0 to N-1, where N is the total number of interlaces in the resource block set. This preliminary indexing framework enables systematic and precise resource allocation while simplifying the index determination process through predefined mapping relationships between PSSCH and PSFCH resources.
Solution Approach 2:
The patent changes the resource allocation parameters by introducing interlace indices as a new dimension for resource identification. By defining specific mapping relationships between PSSCH resource indices and PSFCH interlace indices, the system achieves precise resource allocation while maintaining manageable complexity through parameter transformation.
3Loss of information
If multiple PSFCH resources are allocated for HARQ-ACK multiplexing, then information capacity is improved, but resource overhead increases
Solution Approach 1:
The patent merges multiple HARQ-ACK information bits into a single PSFCH transmission by allocating multiple PSFCH resources within the same interlace. These resources are combined to convey multiple acknowledgment states, thereby increasing information capacity without proportionally increasing the number of interlaces or resource block sets required.
Solution Approach 2:
The patent makes each PSFCH interlace multi-functional by enabling it to carry multiple HARQ-ACK information bits through multiple resources within the interlace. This universal design allows the same interlace structure to serve both single and multiple acknowledgment scenarios, optimizing resource utilization while maintaining high information capacity.
Data Source
AI summary
In accordance with aspects of the present disclosure, a user equipment (UE) may receive a physical sidelink shared channel (PSSCH) transmission via a slot i and a sub-channel j. The UE may determine, within a resource block (RB) set k and a physical sidelink feedback channel (PSFCH) transmission occasion n, at least one interlace to use for a PSFCH transmission based at least in part on an index of the slot i, an index of the sub-channel j, a PSFCH periodicity, and a quantity of sub-channels in the RB set k. The UE may transmit the PSFCH transmission via the at least one interlace in the RB set k during the PSFCH transmission occasion n. The PSFCH transmission may include feedback for the PSSCH transmission.