Base Station Aperiodic CSI Signaling via RRC Configuration

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Solution Overview

Problem

In radio communication systems, when aperiodic channel state information (CSI) is reported using the Physical Uplink Control Channel (PUCCH), there is a lack of specific study on signaling the configuration information, leading to inefficiencies in decoding HARQ-ACK and potential retransmissions of PDSCH, resulting in wasted radio resources.

Innovation Solution

A base station obtains and transmits a Radio Resource Control (RRC) message to a terminal apparatus, configuring the aperiodic trigger state for reporting CSI using PUCCH, enabling appropriate signaling of CSI configuration information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If aperiodic CSI report is transmitted using PUCCH, then reporting latency is reduced, but signaling configuration information is incomplete leading to decoding errors and retransmissions

Engineering Contradiction:

ImproveCSI reporting latencyVSAvoidDecoding reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The base station performs preliminary configuration by transmitting RRC messages that define aperiodic trigger states, associated report configurations, and resource allocations before actual CSI reporting occurs. This advance setup ensures that when PUCCH-based aperiodic CSI reporting is triggered, all necessary configuration information is already available at the terminal, preventing decoding errors and retransmissions while maintaining low latency

Inventive Principle:

Principle #10Preliminary action

2Reliability

If detailed configuration information is signaled for PUCCH-based aperiodic CSI reporting, then reporting reliability improves, but signaling overhead increases

Engineering Contradiction:

ImproveCSI reporting reliabilityVSAvoidSignaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The configuration information is segmented into multiple components transmitted through different signaling mechanisms: RRC messages carry detailed aperiodic trigger state configurations including reportConfigId associations and resource allocations, while DCI provides dynamic triggering. This segmentation allows comprehensive configuration to be delivered without overwhelming signaling overhead in any single message

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The aperiodic trigger state configuration framework is designed to be universal, supporting both PUCCH and PUSCH-based CSI reporting through the same RRC configuration structure. The reportConfigId associations and resource allocations can serve multiple reporting scenarios, reducing redundant signaling overhead while maintaining reliability across different reporting modes

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11974285B2Base station, terminal apparatus, method, program, and recording medium

Publication Date: 2024.04.30 NEC CORP

AI summary

In order to enable appropriate signaling of information related to a configuration for reporting aperiodic channel state information using a Physical Uplink Control Channel (PUCCH) to a terminal apparatus, a base station 100 includes: an obtaining unit configured to obtain information related to a configuration of a first aperiodic trigger state for a terminal apparatus 200 to aperiodically report first channel state information by using a PUCCH; and a transmitting processing unit configured to transmit, to the terminal apparatus 200, a Radio Resource Control (RRC) message including the information related to the configuration of the first aperiodic trigger state.