PUCCH Scheduling for Non-Overlapping Aperiodic CSI Reports
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Solution Overview
Problem
In wireless communication systems, there is a challenge in resolving collisions between uplink control information (UCI) transmissions, such as channel state information (CSI) feedback and hybrid automatic repeat request (HARQ) feedback, which occur when multiple transmissions are scheduled to overlap in time, leading to resource conflicts.
Innovation Solution
The technique involves indicating PUCCH resources for aperiodic CSI reports within a downlink grant, using counter and total DAI to schedule non-overlapping multiple A-CSI reports in the same slot, allowing for simultaneous transmission of CSI and HARQ feedback without collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple uplink control information transmissions are scheduled to overlap in time, then the system can support multiple feedback types (CSI and HARQ), but resource collisions occur leading to transmission conflicts
Solution Approach 1:
The patent segments multiple uplink control information transmissions by assigning different PUCCH resources (different time slots, frequencies, or codes) to different feedback types. Downlink grants include indicators that specify which PUCCH resource to use for CSI reports, HARQ feedback, or both, thereby preventing resource collisions while supporting multiple feedback types simultaneously
Solution Approach 2:
The patent applies preliminary action by pre-configuring PUCCH resources and their associations with downlink grants before actual transmissions occur. The network device预先 assigns specific PUCCH resources to specific downlink grants, and these associations are stored and referenced during transmission to avoid real-time collision resolution
2Reliability
If separate PUCCH resources are allocated for CSI and HARQ feedback, then resource collisions are avoided, but uplink control channel resource overhead increases
Solution Approach 1:
The patent implements multi-functionality by designing PUCCH resources that can serve multiple purposes. A single PUCCH resource can be configured to carry both CSI reports and HARQ feedback depending on the downlink grant indication, reducing the total number of dedicated resources needed while maintaining collision avoidance through proper resource selection and timing
3Productivity
If multiple A-CSI reports are scheduled in the same slot, then feedback timeliness is improved, but resource conflicts increase without proper multiplexing
Solution Approach 1:
The patent applies dynamics by making PUCCH resource allocation flexible and adaptive. Instead of fixed static allocations, the system dynamically selects PUCCH resources based on real-time scheduling decisions indicated in downlink grants. This allows multiple A-CSI reports to be multiplexed in the same slot by assigning them to different dynamic PUCCH resources, maintaining feedback timeliness while avoiding resource conflicts
Data Source
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AI summary
Apparatus, methods, and computer-readable media for facilitating multiplexing of downlink grant-triggered aperiodic channel state information reports on an uplink control channel are disclosed herein. An example method for wireless communication at a UE includes receiving scheduling to provide multiple A-CSI reports while foregoing A-CSI multiplexing, the scheduling for up to two A-CSI reports in a same slot for the UE, and the multiple A-CSI reports being non-overlapping in time in the same slot. The example method also includes transmitting the multiple A-CSI reports to a base station in respective PUCCH in the same slot and while foregoing CSI multiplexing.