CSI-Triggered Uplink Beam Reporting for Lower PUCCH Overhead
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Solution Overview
Problem
Legacy beam management procedures in communication devices result in high UL reporting and control signaling overhead due to frequent beam reporting, while less frequent reporting leads to outdated beam information, causing performance degradation.
Innovation Solution
A method for communication devices that configures UL transmissions based on channel state information (CSI) reports, including threshold-based and timer-based conditions for transmitting physical uplink control channels (PUCCH) and uplink channels, utilizing layer 1 reference signal received power (L1-RSRP) comparisons and event types to optimize beam reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequent beam reporting is configured, then the network can timely acquire the best beam, but UL reporting overhead and control signaling overhead increase
Solution Approach 1:
The patent changes the reporting trigger parameter from time-based (periodic) to condition-based (event-triggered). The UE monitors beam quality metrics (e.g., L1-RSRP) and only reports when specific events occur, such as beam quality exceeding a threshold or changing by a certain offset. This parameter change reduces reporting frequency while ensuring timely beam information is provided when actually needed.
Solution Approach 2:
The system enables the UE to autonomously determine when beam reporting is necessary based on pre-configured event criteria. The network configures event types and thresholds, but the UE independently evaluates beam quality and decides whether to trigger reporting, eliminating the need for continuous network-scheduled reporting and reducing overhead.
2Quantity of substance
If less frequent beam reporting is configured, then UL reporting overhead is reduced, but the beam information becomes outdated leading to performance degradation
Solution Approach 1:
The patent implements a feedback mechanism where the UE continuously monitors beam quality and compares it against configured thresholds and offsets. This feedback loop ensures that reporting is triggered immediately when beam conditions change significantly, maintaining information freshness without requiring frequent periodic reports. The network receives timely updates when they are actually needed.
Solution Approach 2:
The reporting frequency becomes dynamic rather than static. Instead of fixed periodic intervals, the reporting rate adapts to actual beam conditions - increasing when beam quality changes occur and decreasing when conditions are stable. This dynamic approach balances overhead reduction with information freshness.
3Quantity of substance
If event-driven beam reporting is implemented, then reporting overhead is optimized, but the complexity of event configuration and management increases
Solution Approach 1:
The patent segments the beam reporting configuration into distinct event types (e.g., beam quality exceeding threshold, beam quality change offset, beam failure detection). Each event type has specific trigger conditions and reporting requirements. This segmentation allows the network to configure only the relevant event types needed for specific scenarios, managing complexity through modular configuration.
Data Source
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AI summary
A method for communication device handling uplink (UL) transmission and a user equipment are provided. The method includes: receiving a first channel state information (CSI) report configuration from a network, wherein the first CSI report configuration includes at least one of an event type, a resource for a physical uplink control channel (PUCCH), or a set of reference signals; performing at least one measurement for the set of reference signals according to the first CSI report configuration; and determining whether to transmit the PUCCH according to the at least one measurement.