Adaptive HARQ-ACK Codebook Generation for 5G Uplink Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current radio communication systems for fifth-generation cellular networks face challenges in efficiently managing HARQ-ACK codebooks for efficient communication, particularly in scenarios requiring high-speed, low-latency, and massive machine-type connections.

Innovation Solution

A terminal apparatus and base station apparatus that generate and transmit HARQ-ACK codebooks based on provided RRC parameters, allowing for one or two codebooks to be generated depending on the parameter availability, enabling efficient communication by optimizing HARQ-ACK transmission on PUCCH.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple HARQ-ACK codebooks are generated to improve communication reliability, then the reliability of HARQ-ACK transmission is improved, but the device complexity and processing overhead increase

Engineering Contradiction:

ImproveHARQ-ACK transmission reliabilityVSAvoidcodebook generation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The HARQ-ACK codebook is segmented into multiple codebooks (first HARQ-ACK codebook and second HARQ-ACK codebook) that are generated and transmitted separately. Each codebook contains HARQ-ACK information for specific downlink transmissions, allowing the system to improve reliability through redundancy while managing complexity by dividing the overall codebook into manageable segments based on RRC parameter configurations

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically adjusts the number of HARQ-ACK codebooks generated based on the presence or absence of RRC parameters. When RRC parameters are provided, two codebooks are generated; when not provided, only one codebook is generated. This dynamic adaptation allows the system to optimize between reliability and complexity based on current communication conditions

Inventive Principle:

Principle #15Dynamics

2Reliability

If HARQ-ACK codebooks are transmitted on PUCCH to ensure reliable acknowledgment, then the reliability of downlink acknowledgment is improved, but the uplink control channel resources are consumed

Engineering Contradiction:

Improvedownlink acknowledgment reliabilityVSAvoiduplink control channel resources

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Multiple HARQ-ACK codebooks are merged and transmitted together on the PUCCH channel. The first and second HARQ-ACK codebooks are combined into a single transmission resource, allowing the system to maintain high acknowledgment reliability while efficiently utilizing uplink control channel resources by consolidating multiple codebooks into one transmission event

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS11849449B2Base station apparatus, terminal apparatus, communication method, and integrated circuit

Publication Date: 2023.12.19 SHARP KK

AI summary

A terminal apparatus receives a higher layer parameter and a PDSCH, and generates a HARQ-ACK codebook and transmits the generated HARQ-ACK codebook on a PUCCH. In a case that a first parameter is configured, a first HARQ-ACK codebook and a second HARQ-ACK codebook are generated, the first HARQ-ACK codebook is used to transmit a HARQ-ACK bit corresponding to a PDSCH A, and the second HARQ-ACK codebook is used to transmit a HARQ-ACK bit corresponding to a PDSCH B. In a case that the first parameter is not configured, the first HARQ-ACK codebook is generated, and the first HARQ-ACK codebook is used to transmit the HARQ-ACK bit corresponding to the PDSCH B.