PUCCH Resources for Aperiodic CSI via Downlink DCI
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Solution Overview
Problem
Current NR specifications only support aperiodic CSI feedback via PUSCH, triggered by uplink-related DCI, which is not flexible in scenarios with frequent downlink-heavy scheduling, lacking the ability to provide PUCCH resources for A-CSI triggered by downlink-related DCI formats.
Innovation Solution
Providing PUCCH resources for carrying triggered A-CSI by reusing the existing PUCCH resource configuration framework for UL DCI, with modifications to support A-CSI transmission independently of CSI report configurations and enabling PUCCH resource indication fields to accommodate larger payload sizes, allowing A-CSI to be transmitted on PUCCH without relying on an uplink grant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If A-CSI is transmitted only via PUSCH triggered by uplink-related DCI, then the transmission mechanism is simple and well-defined, but the network scheduling flexibility is limited and cannot support downlink-heavy scenarios
Solution Approach 1:
The patent applies universality by enabling the PUCCH resource configuration framework, originally designed for HARQ-ACK transmission, to also support A-CSI transmission. This allows a single PUCCH resource configuration to serve multiple functions (HARQ-ACK and A-CSI), eliminating the need for separate resource configurations and thereby improving network scheduling flexibility without proportionally increasing complexity
Solution Approach 2:
The patent changes key parameters of the PUCCH resource configuration to accommodate A-CSI transmission, including modifying the PUCCH resource indication fields to support larger payload sizes and adjusting the resource selection mechanisms. These parameter changes enable the existing PUCCH framework to handle A-CSI while maintaining backward compatibility with HARQ-ACK operations
2Adaptability or versatility
If PUCCH resources are configured for A-CSI transmission, then scheduling flexibility improves, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent makes the PUCCH resource configuration framework universal by enabling it to handle both HARQ-ACK and A-CSI transmissions through the same resource allocation mechanisms. This multi-functionality reduces the need for separate configuration sets, thereby limiting the increase in device complexity while achieving A-CSI transmission capability
Solution Approach 2:
The patent introduces dynamic resource indication fields that can adaptively indicate different PUCCH resources based on the transmission content (HARQ-ACK or A-CSI) and payload size. This dynamic approach allows the system to flexibly allocate resources without requiring static pre-configuration for all possible scenarios, thus managing complexity while maintaining versatility
3Quantity of substance
If PUCCH resource indication fields are modified to accommodate larger A-CSI payload sizes, then payload capacity increases, but the control message size and processing complexity increase
Solution Approach 1:
The patent addresses the payload capacity limitation by utilizing additional dimensions in the resource indication mechanism. Instead of simply increasing the bit width of indication fields linearly, the patent employs multi-dimensional resource indication techniques that can represent larger payload sizes through combinatorial encoding across multiple fields or layers, thereby increasing capacity while limiting the proportional increase in processing complexity
Data Source
AI summary
According to some embodiments, a method implemented by a network node in a communication network comprises: triggering one or more aperiodic channel state information (A-CSI) reports from a user equipment (UE) through downlink control information (DCI); and providing to the UE information about a physical uplink control channel (PUCCH) resource for transmitting the triggered one or more A-CSI reports.