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Path computation result-based conflict-avoiding wavelength assignment method

A wavelength allocation and conflict avoidance technology, applied in wavelength division multiplexing systems, selection devices for multiplexing systems, digital transmission systems, etc. The probability of resource conflict and the effect of reducing the blocking rate

Inactive Publication Date: 2012-03-14
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the backward resource conflict plays a dominant role in the blocking rate of the network, and has not been well resolved

Method used

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  • Path computation result-based conflict-avoiding wavelength assignment method
  • Path computation result-based conflict-avoiding wavelength assignment method

Examples

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Embodiment Construction

[0039] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0040] In this embodiment, the GMPLS network using the RSVP-TE protocol is taken as an example to specifically describe the conflict avoidance wavelength method based on the path calculation result of the present invention. figure 1 It is a flow chart of the conflict-avoiding wavelength allocation method based on the path calculation result according to the embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0041] Step A: After receiving the service establishment request, the source node, as PCC (Path Computation Clients, Path Computation Request Client) sends PCE (Path Computation Element, Path Computation Element) through PCEP (Path ...

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Abstract

The invention discloses a path computation result-based conflict-avoiding wavelength assignment method, which relates to the field of wavelength switched optical networks. The method includes the following steps: the explicit route of a newly established optical path is worked out and then sent to a source node, the link information contained in the newly established optical path is compared with existing optical paths in a links contained table (LCT), and if same links are contained, the existing optical paths are stored in a conflict avoidance table (CAT) and the newly established optical path is stored in the LCT, or else the newly established optical path is directly stored into the LCT; (c) the source node sends a Path message to a destination node, and obtains an optical path available wavelength set; (d) if the optical path available wavelength set is empty, a Path Err message is sent and step c is executed, or else a reserved wavelength is selected; (e) a RESVReq message is sent; (f) if available, the current reserved wavelength is stored into the LCT and a Resv message is sent, or else a new reserved wavelength is selected and step e is executed. By using the method, the blocking rate of a network can be decreased.

Description

technical field [0001] The invention relates to the technical field of wavelength switching optical networks, in particular to a conflict-avoiding wavelength allocation method based on path calculation results. Background technique [0002] With the rapid growth of network bandwidth demand, limited wavelength resources will inevitably become the bottleneck of future optical network development. WSON (Wavelength Switched Optical Network) is proposed to quickly and effectively provide and remove optical paths, and make full use of the existing wavelength resources of the network. In the WSON framework, routing and wavelength allocation is a key issue. When a large number of business applications appear in a short period of time or a large number of original services are restored within a specified period of time, there will be resource competition and conflict. [0003] GMPLS (Generalized Multiprotocol Label Switching, Generalized Multiprotocol Label Switching) network reali...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04Q11/00H04J14/02
Inventor 张民王磊谢久雨陈馨
Owner BEIJING UNIV OF POSTS & TELECOMM
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