Radio Base Station DCI Field Alignment for Retransmission Scheduling

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In future radio communication systems, the configuration of retransmission for periodic transmission following higher layer configurations is not adequately addressed, which can lead to deteriorated communication performance.

Innovation Solution

The proposed solution involves configuring retransmission parameters for configured grant-based transmission using either configured grant or dynamic grant configuration information, with specific field bit positions fixed or differentiated in DCI to distinguish between initial and retransmission DCIs, ensuring appropriate reconfiguration of retransmission parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If retransmission is scheduled by downlink control information for periodic transmission, then communication flexibility is improved, but configuration complexity and ambiguity increase

Engineering Contradiction:

Improvecommunication flexibilityVSAvoidconfiguration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the DCI configuration by defining distinct field bit positions for initial transmission DCI and retransmission DCI. This segmentation allows the system to maintain flexible retransmission scheduling while reducing configuration ambiguity by clearly distinguishing between initial and retransmission control information structures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by differentiating specific fields within the DCI structure. By assigning different bit positions and configurations to fields in initial transmission DCI versus retransmission DCI, the system provides localized optimization that reduces overall configuration complexity while maintaining flexibility where needed.

Inventive Principle:

Principle #3Local quality

2Reliability

If retransmission parameters are configured using higher layer configurations, then communication performance is improved, but decoding ambiguity increases

Engineering Contradiction:

Improvecommunication performanceVSAvoiddecoding ambiguity

Core Design Contradiction:

ReliabilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies preliminary action by pre-defining specific field bit positions in the DCI structure before transmission occurs. This preliminary configuration of distinct bit positions for initial and retransmission DCI reduces decoding ambiguity at the time of actual transmission, while still allowing higher layer configurations to optimize communication performance.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP3806532B1Wireless base station and wireless communication method

Publication Date: 2025.08.27 NTT DOCOMO INC

Figure 1
Figure 2
Figure 3

AI summary

A radio base station includes a transmitting section configured to transmit first downlink control information for activation of a first channel following periodicity configured by a higher layer and transmit second downlink control information for scheduling retransmission of the first channel, and a control section configured to match a position of a specific field in the second downlink control information with a position of the specific field in the first downlink control information.