Spectrum allocation method based on idle spectrum continuity sensing in elastic optical network

Abstract

The invention discloses a spectrum allocation method based on idle spectrum continuity sensing in an elastic optical network, and the method comprises the following steps: calculating the number of frequency slots needed for a new service after the new service arrives; step 2, scanning occupation state of link frequency slots on the shortest path, and marking the number of the frequency slots of idle spectrum blocks of a combined link; step 3, comparing the number of the frequency slots of the idle spectrum block of which the maximal number is maximal with the number of the frequency slots needed for the new service, when the number of the frequency slots of the idle spectrum block of which the maximal number is maximal is greater than or equal to the number of the frequency slots needed for the new service, executing a step 5, and when the number of the frequency slots of the idle spectrum block of which the maximal number is maximal is less than the number of the frequency slots needed for the new service, executing the step 4; step 4, calculating a combined link idle spectrum block continuity parameter and comparing the parameter with a threshold value, when the parameter is less than the threshold value, sorting out spectrum and executing the step 2, and when the parameter is greater than the threshold, congesting the service; step 5, calculating all spectrum candidate window positions; step 6, orderly updating frequency slot states of the spectrum candidate window positions to be an occupied state and respectively calculating the parameter; step 7, selecting the spectrum candidate window position with the highest numerical value and allocating service resource to the spectrum candidate window position with the highest numerical value. The method provided by the invention has the advantage of high utilization rate of the spectrum resource.

Description

technical field [0001] The invention relates to the technical fields of elastic optical network and resource allocation, in particular to a spectrum allocation method based on perception of idle spectrum continuity in the elastic optical network. Background technique [0002] The traditional ITU-T wavelength division multiplexing (Wavelength Division Multiplexing, WDM) standard adopts a spectrum grid allocation scheme with fixed intervals, such as dividing the available spectral width (1530-1565nm) of the C-band into fixed intervals of 50 GHz. But when the interface signal transmission rate in the network exceeds 100Gb / s or higher, the fixed spectrum grid allocation scheme cannot meet the demand. At ECOC, the top conference in the field of optical communication in 2008, researchers from Japan's NTT proposed the concept of elastic optical network for the first time, and introduced the implementation of spectrum-sliced ​​elastic optical path (spectrum-sliced ​​elastic optical ...

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Problems solved by technology

[0003] In an elastic optical network, spectrum allocation must meet the constraints of consistency and continuity. Compared with the random hit algorithm, the commonly used First Fit (FF) spectrum allocation algorithm does not need to traverse all spectrum resources, and the calculation amount is small; But its disadvantage is that when a path has multiple frequency slots available for allocation, the frequency slot block with a small frequency slot sequence may still have vacant frequency slots left after being occupied by services. If these remaining vacant frequency slots cannot be used by subsequent Service utilization will form spectrum fragments (fragments), resulting in a decrease in the overall resource utilization of the network and an increase in the service blocking rate

The above-mentioned existing solutions have the following disadvantages: the spectrum allocation process generates many spectrum fragments, the service blocking rate is high, and the overall utilization efficiency of spectrum resources is low

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