HARQ Codebook Segmentation for Low-Overhead ACK Signaling

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Solution Overview

Problem

Highly flexible and dynamic HARQ feedback in wireless communication systems leads to increased signaling overhead, which is undesirable.

Innovation Solution

Implementing multiple HARQ codebooks based on decoding timing information and reception allocation configuration to manage rescheduling and retransmission efficiently, allowing for low overhead acknowledgement signaling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If highly flexible and dynamic HARQ feedback is implemented, then a wide variety of use cases are supported, but signaling overhead increases

Engineering Contradiction:

Improveflexibility of HARQ feedbackVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent divides the HARQ codebook into multiple segments (first HARQ codebook and second HARQ codebook), each handling different transmission timing intervals. This segmentation allows the system to maintain flexibility for various use cases while reducing the overhead of transmitting a single large codebook by splitting it into manageable parts that can be handled separately.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic selection between different HARQ codebooks based on reception allocation configuration and decoding timing information. The system can dynamically choose which codebook to use depending on the specific transmission scenario, maintaining adaptability while optimizing overhead by selecting the most appropriate codebook size and structure for each situation.

Inventive Principle:

Principle #15Dynamics

2Loss of information

If multiple HARQ codebooks are used to manage rescheduling and retransmission, then acknowledgement signaling overhead is reduced, but system complexity increases

Engineering Contradiction:

Improvesignaling overheadVSAvoidHARQ codebook management complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent changes key parameters such as reception allocation configuration and decoding timing information to determine which HARQ codebook to use. By dynamically adjusting these parameters based on the transmission scenario, the system reduces signaling overhead while managing complexity through parameter-driven selection rather than complex structural changes.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system uses self-service mechanisms where the wireless device autonomously determines which HARQ codebook to use based on pre-configured reception allocation information and decoding timing capabilities. This self-determination reduces the need for complex centralized control and signaling, thereby reducing overhead while managing complexity through local decision-making.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260058761A1Acknowledgement signaling for radio access networks

Publication Date: 2026.02.26 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

There is disclosed a method of operating a wireless device in a radio access network, the method including transmitting first acknowledgement signaling according to a first HARQ codebook, and transmitting second acknowledgement signaling according to a second HARQ codebook, the first HARQ codebook indicating a first acknowledgement information structure, and the second HARQ codebook indicating a second acknowledgement information structure, wherein the first HARQ codebook and the second HARQ codebook are based on a reception allocation configuration pertaining a first transmission timing interval and decoding timing information indicating a decoding timing capability of the wireless device. The disclosure also pertains to related devices and methods.