Path calculation method based on PCE in optical network

Abstract

The invention discloses a path calculation method based on a PCE in an optical network. The PCE path calculation process comprises the following steps of: dividing N services in a buffer into a group for uniform processing; calculating the shortest path of each service and carrying out wavelength reservation; sequentially checking whether the shortest path and a pre-request service have link overlapping when a post-request service path is failed in the calculation, if yes, regulating the path of the pre-request service; and analogically, finally enabling the service paths as much as possible to be calculated successfully. On the basis of considering the influence on the post-request service by the pre-request service and considering the influence on the pre-request service by the post-request service, the invention reduces the possibility of wavelength distribution conflict to a certain extent so as to achieve the aims of reducing service blocking rate and improving resource utilization rate in the optical network.

Description

technical field [0001] The present invention relates to the technical field of Automatically Switched Optical Networks (ASON), in particular to a PCE (Path Computation Element, Path Computation Element)-based path calculation method in an optical network. Background technique [0002] In the optical network, services do not arrive at the same time, but there is a problem of requesting first and requesting later, and the path calculated for each service will occupy the corresponding wavelength resource when reserving the wavelength. The available wavelength resources will be relatively less, so that the blocking rate will be relatively high. [0003] In the path calculation process, the traditional path calculation method calculates the path for each business in turn according to the order of arrival, and uses the shortest path as the working path each time. Path calculation is performed in the wavelength resource of the second request service. If the wavelength assignment c...

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Problems solved by technology

[0003] In the path calculation process, the traditional path calculation method calculates the path for each business in turn according to the order of arrival, and uses the shortest path as the working path each time. Path calculation is performed in the wavelength resource of the second request service. If the wavelength assignment conflict occurs between the last request service and the first request service, the last request service will be automatically blocked. This method can only ensure that the first request service selects the optimal path, but the path calculation of the last request service succeeds. The rate is relatively low, resulting in an increase in the blocking rate in the optical network, affecting network performance

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