PUCCH HARQ-ACK Codebook Timing for SCell Dormancy

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Solution Overview

Problem

The current 5G NR framework is inadequate for determining type-1 HARQ-ACK codebooks in physical uplink control channels (PUCCH) for secondary cell (SCell) dormancy, leading to synchronization issues between UEs and network nodes.

Innovation Solution

Determine K1 values using a specific set of slot timing values with integer multiples for type-1 HARQ-ACK codebook determination in PUCCH when an SCell switches to a dormant BWP, synchronizing UE and network node operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the current 5G NR framework is used for determining type-1 HARQ-ACK codebook, then the framework provides a general structure, but it causes synchronization issues between UEs and network nodes for SCell dormancy

Engineering Contradiction:

Improveframework generalityVSAvoidsynchronization accuracy

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent modifies the K1 value determination parameters by introducing a set of slot timing values with integer multiples when the SCell is in dormant state. This parameter change enables proper synchronization between UE and network node for type-1 HARQ-ACK codebook determination in the dormant state, resolving the synchronization issue while maintaining framework generality.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If SCell transitions to dormant state using BWP switching, then power consumption is reduced and switch delay is minimized, but the current HARQ-ACK codebook determination becomes unsuitable

Engineering Contradiction:

ImproveUE power consumptionVSAvoidcodebook determination suitability

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The patent introduces a specific set of slot timing values with integer multiples for determining K1 values when the SCell is in dormant state. This parameter adaptation enables the HARQ-ACK codebook determination to work correctly in the dormant state, maintaining the benefits of BWP switching for power saving while solving the codebook determination issue.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If PDCCH monitoring occasion is not configured in dormant BWP, then UE power consumption is reduced, but type-1 HARQ-ACK codebook determination becomes problematic

Engineering Contradiction:

ImproveUE power consumptionVSAvoidcodebook determination complexity

Core Design Contradiction:

Use of energy by moving objectVSDifficulty of detecting and measuring

Solution Approach 1:

The patent establishes a specific parameter set (slot timing values with integer multiples) for determining K1 values in the dormant state. This parameter definition simplifies the codebook determination process despite the absence of PDCCH monitoring configuration, making the measurement and detection of HARQ-ACK codebook feasible in the dormant state.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12549287B2Method and apparatus for determination of type-1 HARQ-ACK codebook in PUCCH for SCell dormancy

Publication Date: 2026.02.10 MEDIATEK INC

AI summary

Various solutions for determination of type-1 hybrid automatic repeat request-acknowledgement (HARQ-ACK) codebook in physical uplink control channel (PUCCH) for secondary cell (SCell) dormancy are described. An apparatus may determine that an active downlink (DL) bandwidth part (BWP) for a serving cell of the apparatus is a dormant BWP. The apparatus may determine K1 values associated with an active uplink (UL) BWP for the serving cell according to a set of slot timing values including integer multiples of 1. Accordingly, the apparatus may apply the K1 values for determination of a type-1 HARQ-ACK codebook in a PUCCH.