PUCCH HARQ Feedback Prioritization for Unicast Multicast

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently performing wireless signal transmission and reception procedures, particularly in managing multiple physical downlink control channels (PDCCHs) and hybrid automatic repeat request (HARQ) feedback information.

Innovation Solution

A method and apparatus for efficiently transmitting and receiving wireless signals by implementing a system that allows user equipment (UE) to receive multiple PDCCHs, transmit multiple downlink signals, and send a single physical uplink control channel (PUCCH) with HARQ feedback information, while prioritizing HARQ feedback and using UCI multiplexing to manage payload size constraints.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple PDCCHs and DL signals are received with different priorities, then the system can support diverse communication services (unicast and multicast), but the complexity of managing HARQ feedback information and PUCCH resource allocation increases

Engineering Contradiction:

Improvesupport for unicast and multicast servicesVSAvoidHARQ feedback management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning different priority levels to different HARQ feedback information based on their service types. Unicast HARQ feedback is assigned higher priority than multicast HARQ feedback, allowing the system to differentiate and prioritize feedback based on local service requirements rather than treating all feedback uniformly

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments HARQ feedback information into different priority groups (higher priority for unicast, lower priority for multicast) and segments PUCCH resource allocation accordingly. This segmentation allows the UE to manage feedback information in organized groups and apply different multiplexing strategies to each segment

Inventive Principle:

Principle #1Segmentation

2Productivity

If UCI multiplexing is performed to include HARQ feedback, SR, and CSI report in a single PUCCH, then resource efficiency is improved, but the payload size constraint of the PUCCH limits the amount of information that can be transmitted

Engineering Contradiction:

Improveresource efficiencyVSAvoidUCI payload size

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent applies partial action by selectively including only the most important UCI elements in the multiplexed transmission when the payload size constraint is reached. HARQ feedback information with higher priority is included first, and lower priority elements (such as CSI reports or SR) are omitted or dropped to fit within the PUCCH payload limit, rather than attempting to include all UCI elements

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent implements a feedback mechanism where the UE evaluates the total UCI payload size against the PUCCH maximum payload size constraint, and when the constraint is exceeded, prioritization rules are applied to determine which elements to include. This feedback-driven approach ensures that critical feedback (harq-ack) is always transmitted while less critical information is sacrificed when necessary

Inventive Principle:

Principle #23Feedback

3Reliability

If HARQ feedback information size increases due to multiple DL signals, then more comprehensive feedback is provided, but the PUCCH payload size constraint is exceeded

Engineering Contradiction:

Improvefeedback comprehensivenessVSAvoidPUCCH payload size

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the parameter of priority assignment based on feedback type. By dynamically adjusting which feedback elements are included based on their priority parameters (unicast HARQ > multicast HARQ > SR > CSI), the system maintains comprehensive feedback for high-priority services while adapting the feedback set to fit within payload constraints when necessary

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250039888A1Method and apparatus for transmitting/receiving wireless signal in wireless communication system

Publication Date: 2025.01.30 LG ELECTRONICS INC

AI summary

According to an embodiment of the present the UE may receive a plurality of physical downlink control channels (PDCCHs) including a first PDCCH carrying first DCI for unicast scheduling and a second PDCCH carrying second DCI for multicast scheduling; receive one or more downlink signals including a unicast physical downlink shared channel (PDSCH) scheduled by the first DCI, and a multicast PDSCH scheduled by the second DCI; and transmit a single physical uplink control channel (PUCCH), based on uplink control information (UCI) including hybrid automatic repeat request (HARQ) feedback information for the one or more DL signals including at least one of first HARQ feedback information for the unicast PDSCH, and second HARQ feedback information for the multicast PDSCH.