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Collision avoidance wavelength assignment method based on PCE (Personal Computer Equipment)

A technology of conflict avoidance and wavelength allocation, which is applied in the direction of selection devices, electrical components, selection devices, etc. Probability, the effect of reducing the blocking rate

Inactive Publication Date: 2014-03-19
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • 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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  • Collision avoidance wavelength assignment method based on PCE (Personal Computer Equipment)

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Embodiment Construction

[0041] 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.

[0042] figure 1 It is a flow chart of a wavelength allocation method based on PCE (Path Computation Element, Path Computation Element) for conflict avoidance according to an embodiment of the present invention. Such as figure 1 As shown, the method includes:

[0043]Step A: After receiving the service establishment request, the source node sends a PCReq message (a path request message) to The PCE requests to establish an optical path from the source node to the destination node.

[0044] Step B: The PCE calculates an explicit route according to TED (Traffic Engineering Database, traffic engineering database) and the constraints of the road construction request, and sen...

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Abstract

The invention discloses a collision avoidance wavelength assignment method based on a PCE (Personal Computer Equipment), relating to the technical field of wavelength switched optical networks. The method comprises the following steps of: C, sending Path information to a destination node by a source node; D, after receiving the Path information by the destination node, judging whether a light path available wavelength set is empty, if so, sending PathErr information to the source node by the destination node and executing a step C; if not, selecting one wavelength as a reserved wavelength, and executing a step E; E, sending RESVReq information to the PCE by the destination node; and F, judging whether the current reserved wavelength is available by the PCE, if so, storing Path ID of the Path information, the current reserved wavelength and RID in a CAT (Computer Aided Translation) table, and notifying the destination node to send Resv information; if not, selecting a new available wavelength as the reserved wavelength, and executing the step E. According to the method disclosed by the invention, the network backward resource collision probability can be reduced, therefore, the network blocking rate is reduced.

Description

technical field [0001] The invention relates to the technical field of wavelength switching optical networks, in particular to a PCE-based conflict-avoiding wavelength allocation method. 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) was 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 realizes dynamic, real-time a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q11/00
Inventor 张民王磊谢久雨陈馨
Owner BEIJING UNIV OF POSTS & TELECOMM
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