PUCCH Repetition Control for Dynamic CSI Reporting
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Solution Overview
Problem
Current NR specifications do not support dynamic indication of PUCCH repetition for both aperiodic and periodic CSI on PUCCH, limiting network scheduling flexibility and efficiency.
Innovation Solution
Implement mechanisms for dynamic control of PUCCH repetition factors for CSI feedback using DCI or MAC CE, allowing flexible updating of PUCCH resources and repetition factors, enabling HARQ-ACK and CSI reporting together when triggered by a downlink grant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PUCCH repetition is configured for periodic CSI reporting, then reliability of CSI transmission is improved, but network scheduling flexibility deteriorates due to static repetition configuration
Solution Approach 1:
The patent applies dynamics by enabling the repetition factor for periodic CSI reporting to be updated dynamically through DCI signaling. The gNB can adjust the repetition factor in real-time based on current channel conditions and scheduling requirements, transforming the previously static repetition configuration into a dynamic one that adapts to varying network conditions.
Solution Approach 2:
The patent changes the parameter of repetition factor from a fixed configured value to a dynamically adjustable parameter. Through DCI signaling, the gNB can modify the repetition factor parameter to match current transmission needs, allowing the system to optimize between reliability and scheduling flexibility by adjusting this key parameter.
2Reliability
If PUCCH repetition factor is increased for aperiodic CSI, then transmission reliability is improved, but uplink resource overhead increases
Solution Approach 1:
The patent enables dynamic adjustment of the repetition factor for aperiodic CSI reporting through DCI signaling. Instead of using a fixed high repetition factor that always consumes excessive resources, the system can dynamically set the repetition factor to the minimum necessary level for reliable transmission, optimizing the balance between reliability and resource overhead.
Solution Approach 2:
The repetition factor parameter is made adjustable through DCI signaling, allowing the gNB to optimize its value based on current channel conditions. This parameter change capability enables the system to use higher repetition factors only when necessary for reliability, rather than always using high repetition factors that waste uplink resources.
3Device complexity
If static PUCCH resource configuration is used for periodic CSI, then device complexity is reduced, but network scheduling efficiency deteriorates
Solution Approach 1:
The patent introduces dynamics by allowing PUCCH resource configuration for periodic CSI to be updated through DCI signaling. The UE maintains a configured resource set but can receive dynamic indications to use specific resources from this set, combining the simplicity of static configuration with the flexibility of dynamic scheduling.
Solution Approach 2:
The patent segments the resource configuration into two parts: a static configured resource set (maintained by UE) and dynamic resource selection (indicated by gNB via DCI). This segmentation allows the UE to maintain simple configuration state while the gNB retains scheduling flexibility to select appropriate resources based on current network conditions.
Data Source
AI summary
Techniques for reporting Channel State Information. CSI. An example method, implemented in a wireless device, comprises the steps of receiving (1 110) signaling identifying a plurality of time instants in which the wireless device may transmit distinct CSI reports, receiving (1120) signaling identifying a set of one or more resources to be used to transmit a physical channel carrying CSI reports, and receiving (1130) control signaling that identifies a resource in the set of resources, where the control signaling indicates a repetition factor for repetitively transmitting a CSI report, either by association with the resource identified by the control signaling or by a distinct indicator included in the control signaling. The example method further comprises transmitting (1140) the CSI report on the identified resource, according to the repetition factor and in a time instant of the plurality of time instants.