DCI Format Segmentation for PDSCH Group Scheduling

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Solution Overview

Problem

Current communication systems, such as LTE and emerging New Radio (NR) technologies, face challenges in efficiently managing and scheduling Physical Downlink Shared Channels (PDSCH) across multiple groups, leading to suboptimal performance in terms of resource allocation and acknowledgment feedback.

Innovation Solution

The implementation of a terminal apparatus and base station apparatus that receive and transmit specific DCI formats, including PDSCH group indication fields, to schedule PDSCHs within designated groups, and transmit/receive corresponding HARQ-ACK codebooks, allowing for efficient communication by managing PDSCHs within these groups.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple DCI formats with PDSCH group indication fields are used to schedule PDSCHs in different groups, then resource allocation efficiency is improved, but device complexity increases due to handling multiple formats

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The PDSCH resources are segmented into multiple groups (first PDSCH group and second PDSCH group), each scheduled by specific DCI formats. The terminal apparatus is configured to recognize and process different DCI formats (first, second, and third formats) corresponding to different PDSCH groups, enabling differentiated resource allocation while maintaining structured management complexity.

Inventive Principle:

Principle #1Segmentation

2Reliability

If separate HARQ-ACK codebooks are transmitted for different PDSCH groups, then acknowledgment accuracy is improved, but loss of time increases due to additional feedback overhead

Engineering Contradiction:

Improveacknowledgment accuracyVSAvoidfeedback overhead time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The HARQ-ACK feedback is segmented into separate codebooks: a first HARQ-ACK codebook for the first PDSCH group and a second HARQ-ACK codebook for the second PDSCH group. The terminal apparatus transmits these codebooks separately, allowing accurate acknowledgment for each group while enabling the base station to process feedback in an organized manner, reducing overall processing time despite the additional overhead.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11864198B2Terminal apparatus, base station apparatus, and communication method using multiple downlink control information formats to schedule multiple physical downlink shared channels

Publication Date: 2024.01.02 SHARP KK

AI summary

A receiver receives one or multiple first DCI formats, one or multiple second DCI formats, and a third DCI format. The third DCI format does not include a PDSCH group indication field. A PDSCH scheduled by the third DCI format is included in a first PDSCH group. A transmitter transmits a first HARQ-ACK codebook for the first PDSCH group, and/or a second HARQ-ACK codebook for the second PDSCH group. The third DCI format schedules a PDSCH. In a case that the third DCI format is detected, the transmitter transmits an HARQ-ACK bit corresponding to the PDSCH scheduled by the third DCI format.