CSI Report Prioritization for PUCCH HARQ-ACK Collisions
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Solution Overview
Problem
In the context of 5G New Radio (NR) communication systems, there is a challenge of overlapping PUCCH-based CSI reports colliding with HARQ-ACK or SR transmissions, leading to unclear UE behavior and potential compromise of HARQ-ACK reliability.
Innovation Solution
Implementing priority rules based on CSI report parameters to determine which CSI report is piggybacked on the PUCCH resource for HARQ-ACK, ensuring reliable transmission of the most prioritized CSI report.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple CSI reports are transmitted on PUCCH in the same slot, then the quantity of CSI information conveyed is improved, but the reliability of HARQ-ACK transmission deteriorates due to resource collision
Solution Approach 1:
The patent segments multiple CSI reports by assigning different priority levels (first priority, second priority, etc.) based on their configuration parameters. This segmentation allows the system to handle multiple CSI reports systematically by processing them in priority order, preventing resource collision with HARQ-ACK while still conveying multiple CSI information elements.
Solution Approach 2:
The patent changes the parameter of transmission resource allocation by dynamically selecting which CSI report to transmit based on priority rules. When resource collision is detected, the system changes the transmission parameter to include only the highest priority CSI report along with HARQ-ACK, thereby maintaining HARQ-ACK reliability while still conveying critical CSI information.
2Loss of information
If all CSI reports are included in the PUCCH transmission, then the completeness of CSI feedback is improved, but the complexity of UE behavior increases due to ambiguous prioritization rules
Solution Approach 1:
The patent enables the UE to autonomously determine which CSI report to transmit by implementing self-service prioritization based on pre-configured parameters. The UE compares configuration parameters (such as reportConfigId, periodicity, offset) of multiple CSI reports and automatically selects the highest priority one, eliminating the need for complex network-side arbitration and reducing behavioral ambiguity.
Solution Approach 2:
The prioritization rules are pre-configured and established before transmission occurs. The network configures multiple CSI report settings with implicit priority indicators, allowing the UE to perform preliminary prioritization assessment before the actual transmission decision, thereby simplifying real-time UE behavior while maintaining information completeness.
3Productivity
If CSI reports are piggybacked on PUCCH for HARQ-ACK, then the efficiency of uplink resource usage is improved, but the risk of transmission error increases due to resource overlap
Solution Approach 1:
The patent applies partial action by selecting only the most critical CSI report (highest priority) to be piggybacked on the PUCCH resource for HARQ-ACK transmission, rather than including all CSI reports. This partial inclusion maintains uplink resource efficiency while minimizing the risk of transmission errors by reducing the total payload size and avoiding resource collision with other high-priority transmissions.
Data Source
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AI summary
There is provided a method performed by a wireless device for prioritizing channel state information reports. The method comprises determining to transmit a portion of a plurality of channel state information reports that are each separately scheduled for transmission responsive to determining that the reports would be transmitted in a same slot with acknowledgement information indicating whether data was successfully or unsuccessfully received by the wireless device. The method further comprises transmitting, by the wireless device in that slot, that portion of the channel state information and the acknowledgement information. There is also provided a method performed by a base station, a wireless device and a base station.