Virtual Concatenation Group Routing for Differential Delay Control
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Solution Overview
Problem
Current network systems face challenges in managing differential delay in virtual concatenation groups, where members travel over different routes, leading to potential signal loss due to excessive latency beyond buffering capabilities, especially during protection switching or re-routing events.
Innovation Solution
A network control entity that receives data on events affecting virtual concatenation group members, computes new routes for unaffected members to maintain inter-member differential delay within acceptable ranges, using routing constraints based on latency and network topology data to ensure proper re-combination at the destination node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If members of a virtual concatenation group are routed over different routes to accommodate bandwidth requirements, then the bandwidth capacity is improved, but the inter-member differential delay increases causing signal loss
Solution Approach 1:
The system performs preliminary actions by pre-computing alternative routes and pre-configuring routing constraints based on latency requirements. When a protection switching event occurs, the system has already prepared the necessary routing information to quickly re-route members while maintaining acceptable differential delay, preventing signal loss before it occurs.
Solution Approach 2:
The system dynamically adjusts routes based on real-time events. When a protection switching event is detected, the network control entity dynamically computes new routes for affected members and updates routing constraints, allowing the system to adapt to changing network conditions while maintaining signal integrity.
2Reliability
If protection switching is implemented to enhance network reliability, then the network protection capability is improved, but the inter-member differential delay may exceed buffering limits causing signal loss
Solution Approach 1:
The system implements feedback mechanisms where the network control entity continuously monitors network events and routing conditions. When a protection switching event occurs, the system receives feedback about the event, computes the impact on differential delay, and adjusts routing constraints accordingly to ensure the delay remains within buffering capabilities.
Solution Approach 2:
The system changes routing parameters dynamically. When protection switching is triggered, the network control entity modifies routing constraints and re-computes routes for affected members, adjusting latency parameters to maintain acceptable differential delay while utilizing protection mechanisms for network reliability.
3Loss of time
If the buffering capability at the destination node is increased to accommodate larger differential delay, then the latency tolerance is improved, but the memory requirement increases
Solution Approach 1:
Instead of increasing buffering capacity in advance, the system performs preliminary routing computations and pre-configures alternative paths. This allows the system to handle larger differential delays without requiring proportionally larger buffers, as the routing strategy proactively manages latency rather than relying solely on increased buffering capacity.
Data Source
AI summary
A network control entity that has an input for receiving data indicative of an event associated with a first member of a virtual concatenation group transported through the network. The network control entity also has a processing entity for computing a new route for a second member of the virtual concatenation group, the computing being triggered by the event.