PDSCH Scheduling Delay Counting for 14-HARQ Cat M1 UEs

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Solution Overview

Problem

Existing solutions for supporting 14-HARQ processes in HD-FDD Cat M1 UEs do not account for additional delays caused when this feature coexists with PUCCH repetitions, invalid BL/CE DL subframes, invalid BL/CE UL subframes, and measurement gaps, impacting PDSCH scheduling delays.

Innovation Solution

A method and apparatus for determining PDSCH scheduling delay by using indicators in DCI to count delays based on the presence of PUCCH repetitions, invalid subframes, and measurement gaps, employing tables to calculate the total number of subframes required for scheduling, considering HARQ-ACK bundling and cross UL transmissions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If 14 HARQ processes are introduced to increase peak data rate, then productivity is improved, but scheduling delay complexity increases due to additional delay scenarios

Engineering Contradiction:

Improvepeak data rateVSAvoidscheduling delay complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the scheduling delay calculation into distinct components: base scheduling delay, PUCCH repetition delay, invalid subframe delay, and measurement gap delay. Each component is calculated separately and then summed to obtain the total scheduling delay, making the complex calculation manageable and systematic

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces an intermediary indicator field in DCI that carries scheduling delay information. This indicator acts as a mediator between the network's scheduling decisions and the UE's delay calculation, enabling the UE to determine the correct scheduling delay without complex autonomous judgment

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If multiple delay scenarios are considered for accurate scheduling delay determination, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improvescheduling delay determination precisionVSAvoiddelay calculation complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements dynamic delay calculation by adjusting the scheduling delay based on the actual presence or absence of PUCCH repetitions, invalid subframes, and measurement gaps. The calculation adapts to different scenarios rather than using a fixed value, ensuring precision without requiring the UE to evaluate all possible scenarios simultaneously

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies partial action by calculating only the relevant delay components that are present in the current scenario. Instead of evaluating all possible delay sources, the UE calculates only those delays that actually apply (e.g., PUCCH repetition delay only if PUCCH repetitions are configured), reducing complexity while maintaining precision

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12520314B2Method and apparatus for physical downlink shared channel scheduling delay counting

Publication Date: 2026.01.06 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A method implemented by a user equipment (UE) in a communication network is provided. The method includes receiving, from a network node, a delay indicator that indicates a scheduling delay for Physical Downlink Shaved Channel, PDSCH, and the UE counts the scheduling delay for the PDSCH according to the received indicator.