Routing and spectrum resource allocation method and system for resource awareness in elastic optical path network

Abstract

The invention discloses a routing and spectrum resource allocation method and a system for resource awareness in an elastic optical path network. The method comprises the following steps that when a request for communication service between an originating node and a destination node arrives, firstly whether the established idle optical paths in the current network can carry the communication service or not is judged, if so, the idle optical paths are directly used for communication, and if not, a PCE (Path Computation Element) generates an auxiliary list of candidate optical paths, wherein the auxiliary list contains link hops of each candidate optical path; a modulation method is determined according to the link hops and frequency slots required by the corresponding candidate optical path for carrying the communication service are computed; the PCE selects a working path according to the required frequency slots and the available frequency slots for the optical path; frequency slot distribution is conducted in the working path to establish a new optical path; and communication is conducted between the originating node and the destination node. After the communication is completed, the new optical path is temporarily not removed, a timer is started up and the steps are repeated within fixed time to realize the resource awareness in the optical path network and solve the problem of high network service blocking rate caused by blockage of the shortest path.

Description

technical field [0001] The present invention relates to the technical field of wavelength-switched optical networks, in particular to a resource-aware routing and spectrum resource allocation method and system in an elastic optical network. Background technique [0002] Wavelength Division Multiplexing (Wavelength Division Multiplexing, WDM) is an optical network communication technology that can combine and transmit different wavelengths simultaneously in the same fiber. Although the traditional WDM optical network has many advantages, its resource allocation granularity (the minimum unit is one wavelength) is too large, which will lead to insufficient resource utilization. figure 1 A schematic diagram of spectrum allocation in a traditional WDM optical network is given as an example. [0003] In response to this problem, some people have previously proposed the concept of SLICE (spectrum-sliced ​​elastic optical path network): according to the data rate requested by the u...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is, in view of the above-mentioned defects, how to solve the problem of high blocking rate of network services caused by insufficient resources on the optical path due to lack of comprehensive consideration of the available spectrum resources of the link when selecting the route.

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