Method for calculating allocated relay resources in optical transmission network planning

Abstract

A method for calculating allocated relay resources in optical transmission network planning relates to the field of routing planning algorithms. The method comprises the following steps: taking a source node as an initial node, finding a farthest node that can establish an effective optical channel, allocating a relay in the farthest node, allocating wavelengths for the channel, and then performing iteration by taking the farthest node as the initial node until a target node is reached, wherein the mode of finding the farthest node that can establish the effective optical channel includes thefollowing processes: acquiring available wavelength sets of the initial node, sequentially calculating intersections of the available wavelength sets that pass through a link between two adjacent nodes until a result is empty or an optical signal to noise ratio (OSNR) of a path from the initial node to the current node is less than a preset threshold, and then backtracking to a nearest node for allocating the relay. According to the method disclosed by the invention, the calculation efficiency can be improved without generating additional relay resources.

Description

technical field

[0001] The invention relates to the field of route planning algorithms, in particular to a calculation method for allocating relay resources in optical transmission network planning. Background technique

[0002] In modern communication core network, the optical transmission network composed of Wavelength Division Multiplexing (WDM) system, Optical Add-Drop Multiplexer (OADM) and Optical Cross-connect (OXC) (Optical Transport Network, OTN), which realizes flexible scheduling of large-grained and multi-type services. With the rapid development of communication technology, the OTN introduces the control plane to evolve into Automatically Switched Optical Network (ASON), realizing the intelligentization of network functions.

[0003] Route and Wavelength Assignment (RWA) refers to finding a route from a source node to a sink node under a given service request, and assigning corresponding wavelengths to these routes. RWA implemented by computer program algorith...

Examples

Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0026] The calculation method for allocating relay resources in the optical transmission network planning of the present invention takes the source node as the starting node, finds the farthest node that can establish an effective optical channel, configures the relay at the farthest node and allocates a wavelength for the channel, and then Use the farthest node as the starting node to iterate until reaching the target node. Among them, the available wavelength set of the starting node is obtained, and the intersection of the available wavelength sets of the links between two adjacent nodes is obtained in turn until the result is empty or the optical signal-to-noise ratio (OSNR) of the path from the starting node to the current node is less than If the preset threshold is set, it will go back to the nearest node used to configure the relay.

...

technical field

[0001] The invention relates to the field of route planning algorithms, in particular to a calculation method for allocating relay resources in optical transmission network planning. Background technique

[0002] In modern communication core network, the optical transmission network composed of Wavelength Division Multiplexing (WDM) system, Optical Add-Drop Multiplexer (OADM) and Optical Cross-connect (OXC) (Optical Transport Network, OTN), which realizes flexible scheduling of large-grained and multi-type services. With the rapid development of communication technology, the OTN introduces the control plane to evolve into Automatically Switched Optical Network (ASON), realizing the intelligentization of network functions.

[0003] Route and Wavelength Assignment (RWA) refers to finding a route from a source node to a sink node under a given service request, and assigning corresponding wavelengths to these routes. RWA implemented by computer program algorith...

Examples

Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0026] The calculation method for allocating relay resources in the optical transmission network planning of the present invention takes the source node as the starting node, finds the farthest node that can establish an effective optical channel, configures the relay at the farthest node and allocates a wavelength for the channel, and then Use the farthest node as the starting node to iterate until reaching the target node. Among them, the available wavelength set of the starting node is obtained, and the intersection of the available wavelength sets of the links between two adjacent nodes is obtained in turn until the result is empty or the optical signal-to-noise ratio (OSNR) of the path from the starting node to the current node is less than If the preset threshold is set, it will go back to the nearest node used to configure the relay.

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