Aperiodic CSI Reporting for PUSCH-Constrained Carrier Aggregation

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Solution Overview

Problem

Existing wireless communication systems face inefficiencies in channel state information (CSI) reporting, particularly in downlink carrier aggregation, due to resource limitations and poor radio frequency conditions, leading to suboptimal DL link adaptations and increased processing power consumption.

Innovation Solution

A method for determining aperiodic CSI reports by selecting a maximum number of active component carriers based on available resources and RF conditions, using look-up tables and considering SINR, HARQ-ACK bits, and power headroom to optimize CSI reporting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a network node requests CSI reports including all active component carriers, then DL link adaptation effectiveness is improved, but PUSCH resource consumption increases and may exceed available resources

Engineering Contradiction:

ImproveDL link adaptation effectivenessVSAvoidPUSCH resource consumption

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent applies dynamics by making the CSI report configuration adaptive rather than static. The network node dynamically determines the number of component carriers to include in CSI reports based on real-time assessment of PUSCH resource availability and RF conditions. This allows the system to adjust the reporting scope flexibly - requesting comprehensive CSI when resources are abundant and limiting scope when resources are constrained, thereby resolving the contradiction between adaptation effectiveness and resource consumption.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of CSI report configuration by introducing a variable number of component carriers based on PUSCH resource assessment. Instead of fixed periodic reporting or blind requests for all carriers, the system modifies the reporting parameters (number of CCs, report type) according to available resources and channel conditions, enabling optimal balance between adaptation quality and resource usage efficiency.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If a network node requests frequent CSI reports on all active CCs, then DL channel condition accuracy is improved, but UL resource allocation becomes insufficient especially when RF conditions are poor

Engineering Contradiction:

ImproveDL channel condition accuracyVSAvoidUL resource allocation sufficiency

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent implements feedback mechanisms where the network node assesses PUSCH resource availability and RF conditions before requesting CSI reports. The assessment feedback loop includes monitoring UL channel conditions and adjusting CSI request parameters accordingly. When RF conditions are poor or resources are constrained, the system reduces the number of CCs included in reports or changes report timing, ensuring reliable UL transmission while maintaining adequate DL adaptation capability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts CSI reporting parameters based on real-time RF condition assessment and PUSCH resource availability. The network node flexibly modifies the number of component carriers, report frequency, and report type according to current channel conditions, ensuring that UL resources are allocated sufficiently while maintaining accurate DL channel state information for effective link adaptation.

Inventive Principle:

Principle #15Dynamics

3Reliability

If a network node uses conservative RF condition thresholds for allowed CC numbers, then aCSI report decoding reliability is improved, but the number of active CCs used is limited without considering available REs

Engineering Contradiction:

ImproveaCSI report decoding reliabilityVSAvoidnumber of active CCs utilized

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameter of CC number selection by moving from conservative fixed thresholds to dynamic parameter adjustment based on actual PUSCH resource availability and RF conditions. The network node calculates the maximum number of CCs that can be supported given current resources and channel conditions, allowing the system to adaptively increase CC utilization when conditions permit while maintaining reliability through resource-constrained optimization rather than arbitrary conservative limits.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250350983A1Downlink channel state information requests driven by physical uplink shared channel link adaptations

Publication Date: 2025.11.13 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A network node configured to communicate with a wireless device (WD) is described. The network node includes processing circuitry and a radio interface in communication with the processing circuitry. The processing circuitry is configured to determine at least one component carrier (CC) to be included in a report based on at least one of an information carrying capacity (ICC) and a table; and determine a report request including at least the determined at least one CC. The radio interface is configured to transmit the report request to the WD. Other apparatuses, methods, and system are also described.