PUSCH Repetition Scheduling for Low-Latency URLLC Uplinks

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Solution Overview

Problem

Existing 5G New Radio (NR) systems face challenges in achieving ultra-reliable low-latency communication (URLLC) due to limitations in flexible resource allocation and scheduling, particularly in Physical Uplink Shared Channel (PUSCH) transmissions, which hinder efficient use of the scheduling delay budget and increase control overhead.

Innovation Solution

Implementing dynamic PUSCH repetition mechanisms with enhanced DCI signaling for flexible starting positions and durations within slots, allowing back-to-back transmissions across slot boundaries, and inter-bandwidth part frequency hopping to optimize latency and reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dynamic PUSCH repetition mechanisms with enhanced DCI signaling are implemented, then latency and reliability are optimized, but device complexity increases

Engineering Contradiction:

ImprovePUSCH transmission reliabilityVSAvoidDCI signaling complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements dynamic PUSCH repetition mechanisms where the repetition factor and timing are determined dynamically based on channel conditions and scheduling decisions, rather than using fixed patterns. This allows the system to adapt to varying reliability requirements while managing complexity through dynamic configuration.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The enhanced DCI signaling changes key parameters such as the repetition factor, starting symbol, and duration of PUSCH transmissions dynamically. By modifying these parameters based on current network conditions and URLLC requirements, the system optimizes reliability without requiring complete system redesign.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If flexible resource allocation and scheduling are implemented, then scheduling delay budget efficiency is improved, but control overhead increases

Engineering Contradiction:

Improvescheduling delay budget efficiencyVSAvoidcontrol overhead

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent segments the PUSCH transmission into multiple repetitions with flexible starting positions and durations within slots. This segmentation allows more efficient use of the scheduling delay budget by enabling finer-grained resource allocation while managing control overhead through structured repetition patterns.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces additional dimensions of flexibility by allowing PUSCH transmissions to span across slot boundaries and by enabling frequency hopping between different bandwidth parts. This dimensional expansion improves scheduling efficiency while the structured nature of these extensions helps control overhead growth.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Loss of time

If back-to-back transmissions across slot boundaries are allowed, then latency is reduced, but device complexity increases

Engineering Contradiction:

Improvetransmission latencyVSAvoidscheduling complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent enables back-to-back PUSCH transmissions that continue across slot boundaries without interruption or significant gap. This continuity is achieved through flexible slot formatting and dynamic scheduling that allows transmissions to spill over from one slot to the next, reducing overall latency while managing scheduling complexity through continuous operation.

Inventive Principle:

Principle #20Continuity of useful action

4Reliability

If inter-bandwidth part frequency hopping is implemented, then coverage in power-limited scenarios is improved, but device complexity increases

Engineering Contradiction:

Improvecoverage in power-limited scenariosVSAvoidfrequency hopping complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements frequency hopping between different bandwidth parts as a mechanism to improve coverage in power-limited scenarios. By dynamically changing the operating frequency based on channel conditions and power constraints, the system enhances reliability without requiring excessive power consumption.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260025815A1Physical uplink shared channel enhancements for new radio ultra-reliable low-latency communication

Publication Date: 2026.01.22 APPLE INC

AI summary

A user equipment (UE) can generate a number of repeated physical uplink shared channel (PUSCH) transmissions based on a radio resource control (RRC) signaled time-domain resource allocation table and a downlink control information (DCI) received from a base station. The DCI includes a time-domain resource assignment field, which can point to an entry of the time-domain resource allocation table. The entry of the time-domain resource allocation table may be jointly configured with the number of repeated PUSCH transmissions, a starting symbol, a length of PUSCH, and a PUSCH mapping type.