PON Uplink Grant Scheduling for Low-Latency Industrial Data

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Solution Overview

Problem

Existing field bus networks have millisecond-level operating cycles that cannot meet the higher requirement for lower delay in future industrial manufacturing.

Innovation Solution

Introduce a passive optical network (PON) system with an optical head end and optical terminals, utilizing uplink grant information for periodic and aperiodic data transmission that is continuously valid within a threshold time range, reducing the need for repeated bandwidth map updates and minimizing delay.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional field bus networks are used, then system integration flexibility is improved, but communication delay is too large (millisecond level)

Engineering Contradiction:

Improvesystem integration flexibilityVSAvoidcommunication delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent replaces the traditional electrical field bus transmission system with an optical transmission system using PON technology. The optical line terminal (OLT) and optical network units (ONUs) use optical signals instead of electrical signals, achieving sub-millisecond latency while maintaining system integration flexibility through the standardized PON architecture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the transmission medium parameter from electrical signals to optical signals, and modifies the transmission timing parameters by implementing specific uplink grant information mechanisms. This allows the system to achieve lower latency (sub-millisecond level) while maintaining compatibility with industrial control requirements.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If bandwidth map transmissions are sent frequently, then data transmission control is improved, but unnecessary transmissions increase delay

Engineering Contradiction:

Improvedata transmission control efficiencyVSAvoidtransmission delay

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent implements periodic bandwidth allocation where the OLT sends uplink grant information at specific intervals rather than continuously. The bandwidth map is transmitted only when necessary, with the OLT allocating uplink resources periodically based on actual data transmission needs, thereby reducing unnecessary transmissions and delay.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system enables the OLT to autonomously determine when bandwidth map transmissions are necessary based on buffer status and data flow patterns. The OLT self-adjusts the transmission frequency of bandwidth maps, sending them only when there is actual data to transmit, thus eliminating unnecessary transmissions and reducing delay.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12627911B2Transmission method, apparatus, and system

Publication Date: 2026.05.12 HUAWEI TECH CO LTD

AI summary

In accordance with an embodiment, an optical head end generates uplink grant information of periodic data based on configuration information of the periodic data from a controller, where the uplink grant information of the periodic data is continuously valid within a threshold time range, and indicates a corresponding transmission slot of sending the periodic data by an optical terminal. The optical head end sends the uplink grant information of the periodic data to the optical terminal.