Sidelink Feedback Resource Selection Using Sub-Slot Indices
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in selecting resources for feedback messages associated with data transmissions received in sub-slots, leading to suboptimal feedback scheduling.
Innovation Solution
A user equipment (UE) selects resources for feedback messages based on an index of the slot and an index of the sub-slot, allowing for the use of periodic resources with slot-based periodicity and associating different cyclic shifts with each sub-slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedback resources are selected without considering sub-slot indices, then resource selection is simpler, but feedback scheduling becomes suboptimal and less efficient
Solution Approach 1:
The patent changes the parameters used for feedback resource selection from only slot-based parameters to include both slot index and sub-slot index parameters. This allows the system to select feedback resources based on more granular time-domain information, improving scheduling efficiency without requiring fundamentally new selection mechanisms, just expanded parameter usage.
Solution Approach 2:
The patent segments the feedback resource selection process into two independent stages: first selecting resources based on slot index, then further selecting specific resources within that set based on sub-slot index. This segmentation allows the complex selection process to be broken down into manageable steps, improving efficiency while controlling complexity.
2Adaptability or versatility
If periodic resources with slot-based periodicity are used, then resource allocation is more structured, but adaptability to sub-slot level transmissions is reduced
Solution Approach 1:
The patent introduces dynamic selection within the periodic structure by allowing the specific feedback resource to vary based on the sub-slot index. While the overall periodicity pattern remains stable (providing structure), the specific resource selected within each period dynamically adapts to the sub-slot level transmission characteristics, achieving both stability and adaptability.
3Reliability
If the same feedback resource is used for all sub-slots, then resource management is simpler, but feedback reliability for specific sub-slot transmissions is reduced
Solution Approach 1:
The patent applies local quality by assigning specific feedback resources tailored to each sub-slot index. Instead of using a uniform resource for all transmissions, the system selects resources with properties optimized for the specific sub-slot characteristics, improving reliability. The complexity is managed by using deterministic selection rules based on the sub-slot index.
Data Source
AI summary
Methods, systems, and devices for wireless communications at a user equipment (UE) are described. A user equipment (UE) may receive a first data message in a sub-slot of a slot and in a sub-channel of a sidelink data channel. The UE may select a resource of a sidelink feedback channel based on a first index associated with the slot and a second index associated with the sub-slot within one or more slots comprising the slot. Additionally or alternatively, the UE may select a resource of a sidelink feedback channel from periodic resources having a slot-based periodicity based on an index associated with the sub-slot within one or more slots comprising the slot. The UE may transmit a feedback message associated with the first data message according to the selected resource.