Bandwidth Map Update for Optical Burst Networks
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Solution Overview
Problem
The Optical Burst Transport Network (OBTN) faces resource conflicts due to wavelength and timeslot consistency restrictions, leading to packet losses and reduced network performance, as existing technologies lack effective methods for dynamic bandwidth allocation and resource scheduling.
Innovation Solution
A method and device for bandwidth map update that involves establishing a new bandwidth map, allocating wavelengths and optical burst timeslots based on resource reports, and distributing the updated map to slave nodes, using resource state tables to avoid conflicts and ensure efficient allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If wavelength and timeslot consistency restrictions are enforced for all-optical switching, then optical layer bandwidth on demand and fast scheduling are achieved, but resource conflicts occur leading to packet losses
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-planning bandwidth map updates before they take effect. The master node computes the new bandwidth map in advance, performs conflict detection and resolution beforehand, and only then distributes it to slave nodes. This ensures that fast scheduling is maintained while resource conflicts are eliminated through advance planning and validation.
2Adaptability or versatility
If dynamic bandwidth allocation is implemented in OBTN, then network flexibility and resource utilization are improved, but resource conflicts arise due to wavelength and timeslot consistency constraints
Solution Approach 1:
The patent implements feedback mechanisms by having slave nodes report their current resource usage and bandwidth requirements to the master node. The master node uses this feedback information to compute an optimized bandwidth map that allocates wavelengths and timeslots dynamically while avoiding resource conflicts. The bandwidth map is then distributed back to slave nodes, creating a closed-loop feedback system that maintains network flexibility while preventing harmful resource conflicts.
3Productivity
If centralized control mode is used for bandwidth allocation, then resource scheduling efficiency is improved, but the complexity of bandwidth map calculation and update increases
Solution Approach 1:
The patent applies segmentation by dividing the bandwidth map into multiple sub-maps, where each sub-map corresponds to a specific time slot or resource group. This segmentation allows the master node to calculate and manage smaller, more manageable portions of the overall bandwidth allocation independently. The sub-maps can be processed, validated, and distributed separately, reducing the computational complexity while maintaining centralized control and scheduling efficiency.
Data Source
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AI summary
A method and device for bandwidth map update are disclosed. The method includes: after receiving a bandwidth report carried by a control frame, a master node newly establishing a bandwidth map, newly establishing a resource state table, and setting all resource states in the newly established resource state table to be available; adding a cross-master node transport channel drop allocation structure of the newly established bandwidth map in accordance with a cross-master node transport channel add allocation structure of a bandwidth map to be updated, and updating the resource state table according to resource occupancy thereof; according to the bandwidth report carried by the control frame, allocating a wavelength and an optical burst timeslot one by one to a current bandwidth request, adding wavelengths and optical burst timeslots to the newly established bandwidth map, generating a new bandwidth map, and updating the resource state table; and distributing the control frame carrying the new bandwidth map to slave nodes hop by hop.