Virtual Concatenated Group Segmentation for Bandwidth Stability

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Solution Overview

Problem

Existing data network methods, such as LCAS in SDH/SONET networks, face issues with maintaining stable bandwidth during link failures, leading to unacceptable quality losses for services requiring guaranteed bandwidth.

Innovation Solution

Splitting a virtual concatenated group into two sub-groups for higher and low priority data allows flexible use of transmission capacity, with the remaining link capacity being used exclusively for higher priority data when a fault occurs, utilizing extended LCAS protocol commands to manage and control the sub-groups.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If LCAS is used to reduce bandwidth when a transmission link fails, then the connection is maintained, but the bandwidth is reduced leading to unacceptable quality losses for services requiring stable bandwidth

Engineering Contradiction:

Improveconnection stabilityVSAvoidbandwidth

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The virtual concatenated group is divided into multiple sub-groups, where some sub-groups are transmitted via primary transmission paths and others via secondary transmission paths. This segmentation allows selective transmission maintenance during link failures, preserving bandwidth for critical services while maintaining connection stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically changes transmission parameters by selectively activating or deactivating specific sub-groups based on transmission path status. When a link fails, only the affected sub-groups are adjusted while others continue uninterrupted, maintaining overall bandwidth stability for services requiring guaranteed quality.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If a virtual concatenated group is transmitted via different transmission paths, then diverse routing is achieved, but when one link fails the remaining capacity must serve all data types reducing priority-based quality

Engineering Contradiction:

Improvetransmission path flexibilityVSAvoidquality of service

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

By segmenting the virtual concatenated group into priority-based sub-groups transmitted on different paths, the system maintains transmission flexibility while ensuring that high-priority data can be preserved on working paths during failures, thus maintaining quality of service through selective path utilization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sub-groups within the virtual concatenated group are assigned different quality characteristics based on their priority level. High-priority sub-groups receive guaranteed transmission resources on their designated paths, while low-priority sub-groups can be dynamically adjusted, achieving local quality optimization throughout the transmission system.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8868771B2Method for transmitting data, and network element for a data network

Publication Date: 2014.10.21 XIEON NETWORKS SARL

AI summary

The invention relates to a method for transmitting data in a data network using virtual containers, which are combined to form a virtual concatenated group by means of the Link Capacity Adjustment Scheme, LCAS. The virtual concatenated group is sub-divided on the send side into a first virtual concatenated group and a second virtual concatenated group. Data of a first type is inserted on the send side into the first virtual concatenated group and data of the second type is inserted into the second virtual concatenated group. Said data is then transmitted via the data network.