Bandwidth Allocation in Ring Networks via Logical Topologies
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Solution Overview
Problem
In ring networks, especially for guaranteed point-to-multipoint and multipoint-to-multipoint traffic, accurately estimating bandwidth requirements is challenging, leading to inefficiencies and wastage, particularly in services like Video On Demand and Virtual Private LAN Services.
Innovation Solution
A method that maps logical connection topologies to physical topologies in a ring network, allowing for efficient bandwidth allocation by determining bandwidth requirements for each link based on service parameters and adjusting actual bandwidth usage, with the option to apply a correction factor for deviation, thereby optimizing bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full required bandwidth is allocated for all possible paths in multipoint traffic, then sufficient bandwidth is always available, but large guaranteed bandwidth wastage occurs
Solution Approach 1:
The patent changes the bandwidth allocation parameter from static full-bandwidth reservation to dynamic allocation based on actual traffic patterns. The CAC controller monitors traffic demands and adjusts bandwidth allocation in real-time, allocating bandwidth only when needed rather than reserving it statically for all possible paths.
Solution Approach 2:
The system transitions from static bandwidth allocation to dynamic allocation. The CAC controller continuously monitors traffic conditions and adapts bandwidth allocation accordingly, allowing the network to respond to changing traffic patterns and release unused bandwidth for other uses.
2Reliability
If bandwidth is allocated based on Service Level Agreements for class A0 traffic, then guaranteed bandwidth is provided, but unused reserved bandwidth is wasted
Solution Approach 1:
The CAC controller implements feedback mechanisms by monitoring actual traffic demands and comparing them with reserved bandwidth allocations. This feedback loop enables the system to identify unused reserved bandwidth and reallocate it dynamically, ensuring that guaranteed service levels are maintained while minimizing waste.
Solution Approach 2:
The system dynamically adjusts bandwidth allocation parameters based on monitored traffic conditions. When actual traffic exceeds reservations, additional bandwidth is allocated; when reservations exceed actual traffic, excess bandwidth is released for other uses, maintaining the guarantee while reducing waste.
3Productivity
If estimation methods are used for multipoint traffic bandwidth needs, then CAC can function efficiently, but accurate bandwidth estimation is difficult
Solution Approach 1:
The CAC controller performs self-service by autonomously monitoring traffic patterns and making bandwidth allocation decisions without requiring complex external estimation. The system uses observed traffic data to automatically determine bandwidth needs, improving both accuracy and efficiency.
Solution Approach 2:
The system performs preliminary bandwidth allocation based on Service Level Agreements and historical traffic patterns before actual traffic demands materialize. This preliminary action provides a baseline allocation that can be quickly adjusted based on real-time monitoring, balancing efficiency with accuracy.
Data Source
AI summary
A method for assigning bandwidth in a network including nodes coupled by links arranged in a physical topology, the method including: defining between the nodes logical connections associated with a data transmission service to be provided over the network, the logical connections having a connection topology different from the physical topology, and determining respective bandwidth requirements for the logical connections based on parameters of the service. The method further includes mapping the connection topology to the physical topology, so that each of the logical connections is associated with one or more links of the physical topology, and allocating a bandwidth for the service on each of the links in response to the bandwidth requirements of the logical connections and to the mapping.