Uplink Control Information Multiplexing Size Alignment

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Solution Overview

Problem

In the unlicensed band of new radio (NR), the uncertainty in channel availability due to contention-based access modes leads to missed transmission opportunities, causing decoding failures in uplink control information (UCI) when the physical uplink control channel (PUSCH) and physical uplink shared channel (PUSCH) sizes mismatch between base stations and user equipment (UE).

Innovation Solution

The method involves multiplexing independently coded UCI onto a PUSCH with a target size determined by the actual size of the UCI, ensuring both the terminal device and network device have a consistent understanding of the UCI size, thereby preventing decoding failures and improving reliability by adjusting the size of the UCI to match the target size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If independently coded UCI is multiplexed onto PUSCH without size alignment, then transmission flexibility is improved, but decoding reliability deteriorates due to size mismatch between base station and UE understanding

Engineering Contradiction:

Improvetransmission flexibilityVSAvoiddecoding reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the size parameter of UCI to align with the target size determined by the base station. When the actual UCI size differs from the target size, the UE adjusts the UCI size to match the target size before multiplexing onto PUSCH, ensuring both base station and UE have consistent understanding of the UCI size for reliable decoding

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The base station determines the target size and provides feedback to the UE about the expected UCI size. The UE uses this feedback information to adjust its UCI size accordingly, creating a closed-loop mechanism that ensures size alignment and prevents decoding failures

Inventive Principle:

Principle #23Feedback

2Reliability

If channel access process is performed in unlicensed band, then channel availability is improved, but transmission timing uncertainty increases causing missed transmission opportunities

Engineering Contradiction:

Improvechannel availabilityVSAvoidtransmission timing uncertainty

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The base station performs preliminary determination of the target size and communicates this to the UE before the actual UCI transmission. This preliminary action allows the UE to prepare the UCI with the correct size in advance, eliminating timing uncertainties and ensuring synchronized transmission without requiring additional channel access procedures

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12075420B2Method for transmitting uplink control information, terminal device, and network device

Publication Date: 2024.08.27 VIVO MOBILE COMM CO LTD

AI summary

A method for transmitting uplink control information includes: multiplexing independently coded UCI onto a PUSCH according to a target size to send the independently coded UCI, where the target size is determined according to an actual size of the independently coded UCI.