Terminal HARQ-ACK Codebook Handling for Joint SPS Release

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Solution Overview

Problem

In future radio communication systems like NR, the configuration and reporting of HARQ-ACK for joint SPS release are not clearly defined, leading to inappropriate HARQ control and potential deterioration of communication throughput when multiple SPS configurations are used.

Innovation Solution

The method involves determining the positions and generating the HARQ-ACK codebook for joint SPS release by using semi-static and dynamic HARQ-ACK codebooks, with specific rules for positioning and transmitting valid ACK/NACK bits, even when multiple SPS configurations are activated or deactivated simultaneously.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If joint SPS release is used to deactivate multiple SPS configurations simultaneously, then control flexibility is improved, but HARQ control appropriateness deteriorates due to unclear configuration and reporting definitions

Engineering Contradiction:

Improvecontrol flexibilityVSAvoidHARQ control appropriateness

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the HARQ-ACK codebook into multiple parts, with each part corresponding to a specific SPS configuration. When joint SPS release is used, the terminal determines the HARQ-ACK codebook by selecting appropriate segments for each released SPS configuration, ensuring proper segmentation and reporting of HARQ-ACK information for multiple SPS configurations.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If multiple SPS configurations are used to increase scheduling flexibility, then scheduling versatility is improved, but communication throughput deteriorates due to inappropriate HARQ control

Engineering Contradiction:

Improvescheduling versatilityVSAvoidcommunication throughput

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Device complexity

If joint SPS release is implemented without clear HARQ-ACK configuration rules, then device complexity is reduced, but measurement precision deteriorates due to inability to appropriately determine HARQ-ACK codebook

Engineering Contradiction:

Improveconfiguration complexityVSAvoidHARQ-ACK codebook determination accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent establishes preliminary rules for determining HARQ-ACK codebook when joint SPS release is used. The terminal pre-determines the codebook structure by identifying which SPS configurations are released, selecting appropriate codebook parts for each configuration, and preparing the HARQ-ACK information in advance according to predefined segmentation rules.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4033829B1Terminal and wireless communication method

Publication Date: 2025.12.31 NTT DOCOMO INC

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AI summary

A terminal according to an aspect of the present disclosure includes: a receiving section that receives downlink control information for releasing a plurality of semi-persistent schedulings (SPSs); and a control section that determines so as to include a Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) corresponding to the downlink control information at one or a plurality of positions of a semi-static HARQ-ACK codebook. According to an aspect of the present disclosure, the HARQ-ACK codebook can be appropriately determined even when joint SPS release is used.