Switch Fabric Asymmetric Traffic Management
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Solution Overview
Problem
Conventional communication network abstraction systems are limited by their symmetric traffic patterns, which lead to bandwidth fragmentation and inefficiency, as they cannot handle asymmetric traffic patterns and merge/split connections without affecting traffic or increasing blocking probability.
Innovation Solution
The implementation of a switch fabric system with unidirectional asymmetric connections and a management plane that decouples source and sink endpoints, allowing for flexible management of bidirectional and unidirectional connections, enabling the conversion between symmetric and asymmetric traffic patterns without affecting traffic or blocking probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional symmetric traffic patterns are used in switch matrices, then bidirectional circuits can be managed with simple abstractions, but bandwidth fragmentation and loss occur when asymmetric traffic patterns are needed
Solution Approach 1:
The patent applies asymmetry by introducing separate source and sink endpoint abstractions that allow different concatenation sizes and head timeslots for transmit and receive directions. This enables asymmetric traffic patterns where timeslots can be configured independently in each direction, eliminating the bandwidth fragmentation that occurs with symmetric patterns. The switch fabric is modified to handle these asymmetric configurations through separate routing paths for source and sink endpoints.
Solution Approach 2:
The patent segments the connection abstraction into separate source endpoint and sink endpoint components. Each endpoint can be independently configured with its own concatenation size and head timeslot parameters. This segmentation allows the system to handle asymmetric traffic patterns by configuring the source and sink endpoints differently, thereby avoiding bandwidth fragmentation while maintaining manageable abstractions.
2Adaptability or versatility
If timeslots are configured for one concatenation size in transmit direction, then that timeslot is committed, but the same timeslot cannot be used for different concatenation sizes in receive direction
Solution Approach 1:
The patent enables asymmetric configuration where transmit and receive directions can have different concatenation sizes and head timeslots. A timeslot can be configured as STS-3c in the transmit direction while simultaneously being configured as STS-12c in the receive direction. This asymmetric approach allows the system to adapt to different traffic requirements in each direction without wasting bandwidth, directly resolving the contradiction between flexibility and utilization efficiency.
Solution Approach 2:
By segmenting the timeslot configuration into separate source endpoint and sink endpoint settings, the patent allows independent configuration of concatenation parameters for each direction. The source endpoint controls transmit direction settings while the sink endpoint controls receive direction settings, enabling the same physical timeslot to participate in different concatenation groups in opposite directions.
3Ease of operation
If connections are merged into one manageable abstraction, then traffic management is simplified, but blocking probability increases due to increased channel usage
Solution Approach 1:
The patent segments the connection management into separate source endpoint and sink endpoint abstractions that can be independently configured and managed. This segmentation allows the system to manage asymmetric connections more efficiently by treating source and sink configurations separately, reducing the overall resource requirements compared to managing merged symmetric abstractions, thereby lowering blocking probability while maintaining operational simplicity.
Data Source
AI summary
A switch fabric system and network element based thereon include a N×M switch fabric with M Trail Termination Points (TTPs) each with N timeslots there through in a bidirectional manner, a first connection in the switch fabric, wherein the first connection includes a unidirectional asymmetric connection of X timeslots, wherein X<N, and a second connection in the switch fabric in an opposite direction as the first connection, wherein the second connection includes a unidirectional asymmetric connection of Y timeslots, wherein Y<N, and wherein at least one of the Y timeslots overlaps with one of the X timeslots on a same TTP of the M TTPs, wherein N, M, X, and Y each include an integer. A method includes establishing unidirectional asymmetric connections with overlapping portions therein as well as merging, splitting, and converting connections in-service and minimizing blocking probabilities.