Cyclic Queue Mapping for Deterministic Flow Transmission

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Solution Overview

Problem

Jitter on transmission links between nodes in 5th Generation System (5GS) and traditional networks affects deterministic flow transmission, necessitating a solution for reliable and synchronized packet forwarding.

Innovation Solution

A deterministic flow transmission method that determines specified queue information for service packets based on a scheduling and forwarding mapping correspondence between nodes, allowing packets to enter designated cyclic scheduling queues, ensuring deterministic forwarding despite asynchronous node clocks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional packet processing mechanisms are used in 5GS, then network flexibility and adaptability are improved, but jitter is generated affecting deterministic flow transmission

Engineering Contradiction:

Improvenetwork flexibilityVSAvoiddeterministic flow transmission

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the packet processing mechanism into two distinct paths: a default processing path for general traffic and a deterministic processing path for time-sensitive flows. This segmentation allows the network to maintain flexible default handling while providing guaranteed deterministic transmission for critical flows, resolving the contradiction between adaptability and reliability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by implementing deterministic processing characteristics specifically at the transmission nodes handling time-sensitive flows, while other nodes can continue using standard flexible processing. This localized application of deterministic processing ensures reliability where needed without compromising overall network adaptability.

Inventive Principle:

Principle #3Local quality

2Reliability

If retransmission mechanisms are introduced to realize reliability, then transmission reliability is improved, but jitter is generated affecting deterministic flow transmission

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidtransmission jitter

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements preliminary action by pre-configuring deterministic processing parameters, queue mappings, and forwarding rules at transmission nodes before time-sensitive flows arrive. This preliminary setup eliminates the need for real-time retransmission and dynamic adjustments, ensuring both reliability and deterministic timing without jitter.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If clock synchronization is implemented between transmission nodes, then deterministic forwarding precision is improved, but system complexity and synchronization overhead are increased

Engineering Contradiction:

Improveforwarding precisionVSAvoidsynchronization complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent introduces a deterministic flow identifier as an intermediary that carries timing and queue mapping information between transmission nodes. This identifier enables nodes to coordinate deterministic forwarding without requiring complex clock synchronization mechanisms, as each node independently uses the identifier to determine the appropriate cyclic queue and forwarding timing.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If cyclic scheduling queues are configured at each transmission node, then deterministic forwarding is achieved, but device complexity and configuration overhead are increased

Engineering Contradiction:

Improvedeterministic forwardingVSAvoidqueue management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the parameter representation by encoding queue mapping information within the deterministic flow identifier itself rather than maintaining separate complex queue configuration tables. This parameter transformation simplifies device complexity while maintaining deterministic forwarding capability, as nodes can derive queue information directly from the flow identifier.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12418493B2Deterministic flow transmission methods and systems, and electronic devices

Publication Date: 2025.09.16 NEW H3C TECH CO LTD

AI summary

Deterministic flow transmission methods and systems, and electronic devices are provided by the present application. In embodiments of the present application, the first service packet sent by the first transmission node within a certain scheduling cycle is specified to enter a certain cyclic scheduling queue of the second transmission node (that is, the specified cyclic scheduling queue), so as to ensure that the first service packet is scheduled and forwarded on time by the second transmission node. As such, even if there is jitter on the transmission link between the first transmission node and the second transmission node, due to both a scheduling cycle for the first transmission node to schedule and transmit the first service packet and a scheduling cycle for the second transmission node to schedule and transmit the first service packet can be directly determined, it can be ensured that the above-mentioned jitter has no influence on deterministic parameters of the first service packet (which is equivalent to de-jittering the above-mentioned jitter), and a deterministic flow transmission for the first service packet is realized.