Head-End Node Redialing Using Termination Feedback
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Solution Overview
Problem
In communication networks, the delay between resource release and routing advertisement convergence prevents the head-end node from using available resources for redialing connections, leading to potential connection failures, especially when released resources are the only available option, and increasing routing advertisement frequency decreases network scalability.
Innovation Solution
A method where a termination message with feedback on released resources is propagated back to the head-end node, allowing it to update its routing table and compute a new path using up-to-date information before other network elements reserve these resources, thereby enabling the head-end node to utilize recently released resources for the redial connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If routing advertisements are increased in frequency to provide updated resource availability, then the head-end node can access more current routing information, but network scalability decreases due to increased advertisement traffic
Solution Approach 1:
The termination message performs preliminary action by immediately collecting feedback about released resources and propagating this information back to the head-end node before standard routing advertisements are generated. This allows the head-end node to access current routing information without waiting for periodic advertisements, resolving the contradiction between information freshness and network scalability.
2Stability of the object's composition
If the head-end node waits for routing advertisement convergence to access released resources, then routing protocol stability is maintained, but connection establishment fails when released resources are the only available option
Solution Approach 1:
The termination message incorporates feedback about released resources directly into the message propagation path. This feedback mechanism allows the head-end node to immediately know about available resources without waiting for routing advertisement convergence, maintaining both protocol stability and connection establishment success.
3Adaptability or versatility
If standard routing advertisements are used to communicate released resources, then network elements can update routing tables, but the head-end node cannot use released resources before other nodes reserve them
Solution Approach 1:
The termination message acts as an intermediary that directly communicates released resource information from the tail-end node to the head-end node, bypassing the standard routing advertisement mechanism. This intermediary approach eliminates the delay inherent in waiting for routing advertisement convergence, allowing immediate resource utilization while maintaining network element updating capabilities.
Data Source
AI summary
Resources used by a connection are released when a connection is terminated, for example due to a failure on the network. When the connection is to be redialed, an indication of the released resources is collected and provided to the network element that will perform a redial operation to determine the new path for the connection. This allows the network element to determine the new path using up-to-date information, while not allowing other nodes on the network to know about the recently released resources, so that the head-end node has an initial opportunity to use the recently released resources for the redialed connection. Subsequently any unused resources will be advertised on the network for use by other nodes. The head-end network element may be notified of the resources released from termination of the previous connection by causing a termination message to propagate from the tail-end node to the head-end node and collect feedback along the terminating connection path.