Buffered CSI Aggregation for URLLC Reliability

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Solution Overview

Problem

Current wireless communication systems, particularly in 5G NR, face inefficiencies in channel state information (CSI) reporting, where user equipment (UE) typically reports CSI separately for each downlink data transmission, leading to wastage of time and resources, especially in ultra-reliable low latency communications (URLLC) services.

Innovation Solution

The UE accumulates CSI over time for multiple downlink data transmissions in a buffer and sends a single CSI report in response to a CSI report trigger event, allowing for more efficient resource utilization and improved transmission performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE reports CSI separately for each downlink data transmission, then the base station can obtain timely channel state information for each transmission, but it leads to wastage of time and resources and increases latency

Engineering Contradiction:

Improvechannel state information accuracyVSAvoidreporting latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines multiple separate CSI reports into a single aggregated CSI report. The UE accumulates CSI measurements from multiple downlink data transmissions and reports them together in one message triggered by a CSI report trigger event, reducing the number of separate reporting instances while maintaining comprehensive channel state information.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The UE performs preliminary accumulation of CSI measurements in a buffer before the actual reporting event. By pre-collecting CSI from multiple transmissions and preparing the aggregated report in advance, the system reduces the time required at the moment of reporting while ensuring comprehensive channel state coverage.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the UE reports CSI separately for each downlink data transmission, then the base station can adjust parameters for each transmission, but it increases resource consumption and reduces transmission efficiency

Engineering Contradiction:

Improveparameter adjustment capabilityVSAvoidtransmission efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges multiple individual CSI reports into a single aggregated report that contains channel state information for multiple downlink data transmissions. This consolidation reduces the overhead and resource consumption associated with separate reporting while still providing the base station with comprehensive information needed for parameter adjustment across multiple transmissions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The aggregated CSI report serves multiple functions simultaneously: it provides channel state information for multiple transmissions, enables parameter adjustment for future transmissions, and reduces reporting overhead. This multi-functional approach improves transmission efficiency while maintaining the necessary adaptability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If the UE accumulates CSI in a buffer and sends a single aggregated report, then latency is reduced and resource utilization is improved, but the complexity of CSI management increases

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidCSI buffer management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The UE autonomously manages the CSI buffer and determines when to trigger an aggregated report based on configured criteria. The system self-regulates the accumulation process, buffer management, and reporting timing without requiring complex external control mechanisms, thereby improving resource utilization while keeping the complexity manageable through standardized procedures.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent introduces configurable parameters such as the number of transmissions to accumulate, buffer size, and trigger event conditions. By making these parameters adjustable, the system can adapt the level of aggregation and buffer management complexity to match specific service requirements, balancing resource efficiency with implementation complexity.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11678356B2Collecting buffered CSI from a UE

Publication Date: 2023.06.13 QUALCOMM INC

AI summary

Aspects are provided allowing a base station to configure a UE to accumulate CSI over time for downlink data transmissions, and to transfer the accumulated CSI to a base station in a CSI report in response to a CSI report trigger event, thereby improving efficiency in CSI reporting and subsequent transmission reliability. Initially, the base station configures a CSI report trigger event and sends a plurality of data transmissions to a UE. The UE receives the data transmissions and then identifies the CSI report trigger event. Afterwards, the UE sends a CSI report to the base station including a CSI for each of the data transmissions in response to the CSI report trigger event. The base station may then adjust MCS or other parameters for subsequent data transmissions in response to the CSI report.