Aperiodic CSI Priority Handling on PUCCH

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Solution Overview

Problem

Current NR specifications face challenges in handling collisions between aperiodic Channel State Information (CSI) reporting on the Physical Uplink Control Channel (PUCCH) and other types of Uplink Control Information (UCI), lacking flexibility in triggering aperiodic CSI feedback via downlink-related DCI, especially in scenarios with frequent downlink scheduling.

Innovation Solution

Implementing priority handling mechanisms for Aperiodic-CSI on PUCCH, determining priority levels for A-CSI based on comparisons with other UCI, allowing for multiplexing, prioritization, or deprioritization to manage collisions effectively, and enabling aperiodic CSI triggering via downlink-related DCI to improve network scheduling flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If aperiodic CSI reporting is enabled on PUCCH to improve network scheduling flexibility, then scheduling flexibility is improved, but collision with other UCI increases

Engineering Contradiction:

Improvenetwork scheduling flexibilityVSAvoidUCI transmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent introduces a priority level parameter for aperiodic CSI reports, allowing the system to dynamically adjust the importance of different UCI types. By changing this parameter, the system can resolve collisions by prioritizing higher-priority UCI (such as HARQ-ACK) over lower-priority UCI (such as aperiodic CSI), thus maintaining reliability while preserving scheduling flexibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent enables dynamic priority assignment for aperiodic CSI reporting based on downlink scheduling scenarios. The priority level is not fixed but can be configured by the gNB through DCI, allowing the system to adaptively manage UCI collisions according to current network conditions and traffic requirements

Inventive Principle:

Principle #15Dynamics

2Reliability

If priority handling mechanisms are implemented for A-CSI on PUCCH to manage collisions, then collision management is improved, but system complexity increases

Engineering Contradiction:

Improvecollision managementVSAvoidpriority handling complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the UCI transmission problem into distinct priority levels, creating a hierarchical structure where different UCI types are categorized by priority. This segmentation simplifies collision management by providing clear rules: when resources overlap, higher-priority UCI is transmitted while lower-priority UCI is dropped or delayed, avoiding the need for complex arbitration algorithms

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of having the UE make complex decisions about which UCI to transmit during collisions, the patent inverts the approach by having the gNB pre-configure priority levels through DCI. The UE then simply follows these predefined priorities, reducing UE complexity while maintaining reliable collision management

Inventive Principle:

Principle #13The other way round (Inversion)

3Adaptability or versatility

If aperiodic CSI triggering via downlink-related DCI is enabled to improve flexibility, then scheduling flexibility is improved, but handling complexity increases

Engineering Contradiction:

Improvetriggering flexibilityVSAvoidtriggering handling complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent makes the DCI format multi-functional by enabling it to serve both as a downlink scheduling command and as an aperiodic CSI trigger simultaneously. The CSI request field in the DCI can indicate both PDSCH scheduling parameters and aperiodic CSI reporting requirements, consolidating multiple control functions into a single message and reducing overall system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the downlink scheduling function and aperiodic CSI triggering function into a unified DCI-based mechanism. By combining these functions, the system reduces the number of separate signaling messages and procedures needed, simplifying the handling process while maintaining the flexibility to trigger CSI reports based on downlink scheduling decisions

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20230379961A1Priority handling for aperiodic CSI on pucch

Publication Date: 2023.11.23 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

Systems and methods for priority handling for Aperiodic-Channel State Information (A-CSI) on Physical Uplink Control Channel (PUCCH) are provided. In some embodiments, a method performed by a wireless device includes: determining a first priority level of a first Uplink Control Information (UCI) (A-CSI on PUCCH triggered by a downlink related DCI); determining a second priority level of a second UCI; and/or performing a priority level handling action based on a comparison of the first priority level and the second priority level. In some embodiments, performing the priority level handling action includes: multiplexing the UCIs and transmitting them together; transmitting the first UCI and the second UCI separately; and dropping one of the UCIs and transmitting the other. In this way, proper priority levels can be determined for A-CSI on PUCCH when it collides with other types of UCI.