PUCCH Cyclic Shift Mapping for HARQ ACK/NACK Transmission

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently transmitting Hybrid Automatic Retransmission Request (HARQ) Acknowledgement (ACK/NACK) and Scheduling Request (SR) information using Physical Uplink Control Channel (PUCCH), particularly in scenarios where the HARQ ACK/NACK requires one or two bits of information, due to limitations in cyclic shift utilization and resource allocation.

Innovation Solution

A wireless transmit/receive unit (WTRU) employs specific cyclic shifts of a sequence to transmit HARQ ACK/NACK and SR, with one-bit information using a first or second cyclic shift differing by half the sequence length, and two-bit information using four cyclic shifts differing by a quarter of the sequence length, along with resource block allocation and configuration from a network entity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If cyclic shifts are used to transmit HARQ ACK/NACK information, then transmission efficiency is improved, but interference between different cyclic shifts increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidinterference

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by selecting specific cyclic shifts based on the number of HARQ ACK/NACK bits. For one-bit information, cyclic shifts 2 and 10 are selected; for two-bit information, cyclic shifts 1, 3, 7, and 11 are selected. This localized selection optimizes the quality of transmission for each specific case while minimizing interference.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of cyclic shift selection based on the information bit length. By dynamically adjusting which cyclic shifts are used depending on whether one-bit or two-bit HARQ ACK/NACK information needs to be transmitted, the system optimizes transmission efficiency while controlling interference levels.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If more cyclic shifts are used to transmit two-bit HARQ ACK/NACK information, then information capacity is improved, but resource allocation complexity increases

Engineering Contradiction:

Improveinformation capacityVSAvoidresource allocation complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent segments the cyclic shift resources into different groups based on information capacity requirements. For two-bit HARQ ACK/NACK information, four specific cyclic shifts (1, 3, 7, and 11) are allocated, creating a structured segmentation that increases information capacity while managing resource allocation complexity through systematic grouping.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12483373B2Methods, systems, and apparatus for transmitting uplink control information

Publication Date: 2025.11.25 INTERDIGITAL PATENT HOLDINGS INC

AI summary

A wireless transmit receive unit (WTRU) may be configured to transmit uplink control information such as Hybrid Automatic Retransmission Request (HARQ) Acknowledgement or Negative Acknowledgement (ACK/NACK) using a sequence. The HARQ ACK/NACK may comprise one bit or two bits of information, and the WTRU may use a cyclic shift of the sequence to transmit the HARQ ACK/NACK. The WTRU may use different cyclic shifts of the sequence to transmit different HARQ ACK/NACK values and the cyclic shifts may be separated from each other in a manner to facilitate the transmissions. The WTRU may be further configured to receive, from a physical downlink control channel (PDCCH), an indication of a resource block for transmitting the HARQ ACK/NACK.