PSFCH Resource Mapping for Standalone Sidelink CSI-RS
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Solution Overview
Problem
The existing PSSCH-to-PSFCH resource mapping is insufficient for efficiently multiplexing different standalone sidelink CSI-RSs within the same slot-subchannel pair, leading to ambiguities in beam reporting and high probabilities of resource collisions.
Innovation Solution
Enhanced PSFCH resource mapping that allows different PSFCH resources to be mapped to different SL CSI-RSs using various domain allocations (time-domain, frequency-domain, code-domain, space-domain) within the same slot and subchannel, enabling explicit indication of the associated SL CSI-RS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing PSSCH-to-PSFCH resource mapping is used, then resource allocation is simple, but resource collision probability increases and beam reporting accuracy deteriorates
Solution Approach 1:
The PSFCH resource mapping is segmented by associating different PSFCH resources with different domain allocations (time-domain, frequency-domain, code-domain, space-domain) of SL CSI-RS. This segmentation allows unique identification of each SL CSI-RS transmission, eliminating beam reporting ambiguities and reducing resource collisions while maintaining manageable complexity through structured resource association.
2Reliability
If existing PSFCH resource mapping is used, then system operation is simple, but resource collision probability increases
Solution Approach 1:
The patent introduces multi-dimensional domain allocations (time-domain, frequency-domain, code-domain, space-domain) as additional dimensions for PSFCH resource mapping. By mapping PSFCH resources across these multiple dimensions rather than a single dimension, the system uniquely identifies SL CSI-RS transmissions and eliminates resource collisions, while the structured dimensional approach maintains operational simplicity.
3Productivity
If standalone SL CSI-RS multiplexing is implemented, then resource utilization improves, but beam reporting ambiguity increases
Solution Approach 1:
The patent applies local quality by associating specific PSFCH resources with specific domain allocations of SL CSI-RS. Each PSFCH resource is locally optimized to correspond to a particular time-domain, frequency-domain, code-domain, or space-domain allocation, enabling precise beam reporting identification even when multiple SL CSI-RS are multiplexed, thus preventing information loss while maximizing resource utilization.
Data Source
AI summary
An apparatus comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: determine a first allocation comprising at least one of: a first time-domain allocation comprising at least one symbol within a slot associated with a first reference signal transmission, or a first frequency-domain allocation comprising at least one subcarrier within a physical resource block associated with the first reference signal transmission, or a first code-domain allocation comprising a sequence associated with the first reference signal transmission, or a first space-domain allocation comprising a beam associated with the first reference signal transmission; and determine a physical sidelink feedback channel transmission resource for a physical sidelink feedback channel transmission in response to the first reference signal transmission at least based on the determined first allocation.