Selective CES Stream Resynchronization via Cumulative Jitter
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Solution Overview
Problem
Existing resynchronization techniques for synchronous streams in asynchronous packet-switched networks are either costly due to the need for complete synchronization interfaces at each node or limited to small networks due to cumulative jitter issues, making them unsuitable for medium or large networks.
Innovation Solution
A method for distributed resynchronization of CES streams in packet-switched communications networks, where the selection of synchronization nodes is based on cumulative jitter values, allowing for selective resynchronization only where necessary, and can be implemented statically or dynamically, optimizing resource use and compensating for jitter across multiple nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resynchronization is performed at each node of the transmission path, then synchronization precision is improved, but device complexity and cost increase due to requiring complete synchronization interfaces at each node
Solution Approach 1:
The patent segments the transmission path into multiple sections, each handled by a different resynchronization technique. The first resynchronization technique is applied to the first section (ingress node to intermediate node), while the second technique is applied to the second section (intermediate node to egress node). This segmentation allows the system to balance synchronization precision requirements with device complexity constraints by using different approaches in different parts of the network.
Solution Approach 2:
The patent applies different resynchronization strategies to different sections of the transmission path based on local requirements. The first section uses a technique that provides better synchronization precision but higher complexity, while the second section uses a simpler technique. This local quality approach allows optimization of each section independently rather than applying a uniform solution throughout the entire path.
2Device complexity
If resynchronization is performed only at the egress node, then device complexity is reduced, but reliability deteriorates due to cumulative jitter becoming difficult to compensate when the number of nodes exceeds five
Solution Approach 1:
The patent divides the transmission path into two sections with an intermediate node that performs partial resynchronization. This segmentation prevents the cumulative jitter from accumulating across the entire path, as the intermediate node resets the jitter accumulation by resynchronizing packets before forwarding them to the egress node. This maintains reliability in larger networks while avoiding the need for complete synchronization interfaces at every node.
Solution Approach 2:
The intermediate node acts as an intermediary between the ingress node and egress node, performing resynchronization of CES streams before forwarding packets. This intermediary function breaks the cumulative jitter accumulation that would otherwise occur across the entire transmission path, enabling reliable operation in networks with more than five nodes while maintaining relatively simple device complexity.
3Area of stationary object
If the number of nodes in the transmission path increases, then network coverage is improved, but synchronization precision deteriorates due to cumulative jitter becoming difficult to compensate
Solution Approach 1:
The patent segments the transmission path into multiple sections handled by different resynchronization techniques. By introducing an intermediate node that performs resynchronization, the patent divides a long transmission path (which would accumulate excessive jitter) into shorter sections. This allows the network to cover larger areas with more nodes while maintaining synchronization precision within each segment.
Data Source
AI summary
A packet-switched communications network (PSN) includes a multiplicity of nodes (Ni) adapted to switch streams of packets benefiting from circuit emulation services, known as CES packets. The network uses a particular method of resynchronizing the CES streams. According to that method, for a CES stream intended to take an associated path (CE) from an ingress node (N1) passing through a set of nodes including a subset of nodes adapted to resynchronize CES streams selectively, effective resynchronization of said stream by a node selected from said subset is conditioned by a value representative of the cumulative jitter suffered by said stream as far as that node.