Spectrum sensing-based single-path service partitioning-merging optical network frequency allocation method

Abstract

The invention relates to a spectrum sensing-based single-path service partitioning-merging spectrum allocation method in an elastic optical network. An algorithm consists of two parts, when a new service arrives, a spectrum availability-based service-divisible spectrum allocation method is used to allocate spectrum resources for the service, n spectrum blocks with the largest total residual frequency availability of links of a path that the service passes in occupation are selected to transmit the service, the residual spectrum availability of the links is maximized as much as possible, and the blocking rate of a network is reduced; and when an old service leaves, bandwidth resources are released, a spectrum availability-based service merging method is used, whether idle spectrum blocks large enough to satisfy a bandwidth requirement of service merging exist in the path that services under transmission in a partitioned manner pass is inquired, and spectrum availability of links is not reduced after merging, and if the bandwidth requirement is satisfied, the services are merged. The spectrum sensing-based single-path service partitioning-merging spectrum allocation method aims to reduce spectrum resource waste caused by service splitting and too much use of an equipment port, further reduce the blocking rate of the network, and save energy consumption of the equipment port.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and relates to a frequency spectrum allocation method based on spectrum sensing-based single-path service division-combination in an elastic optical network. Background technique [0002] A large number of applications of cloud computing and data centers, and the rapid increase of data services have led to a surge in network bandwidth requirements and energy consumption. In 2009, NTT Corporation proposed a spectrally efficient elastic optical network based on OFDM (Orthogonal Frequency Division Multiplexing) technology. Elastic optical networks can select different modulation levels for services according to service size and transmission distance, and dynamically allocate different frequency slots. Compared with WDM (Wavelength Division Multiplexing) networks with fixed bandwidth granularity, the utilization rate of bandwidth resources is greatly improved. It is considered It...

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Problems solved by technology

[0004] Compared with the spectrum allocation strategy without business segmentation, although the business segmentation strategy can greatly reduce the blocking rate of the network, it faces the following problems: 1) In the elastic optical network, since the subcarriers of different transmitters are not orthogonal, in order to avoid Different services interfere with each other, and a spectrum resource with a frequency slot width needs to be consumed between adjacent services as a guard band

The business segmentation strategy divides a complete service into multiple low-rate sub-services for transmission, which consumes more spectrum resources as guard bands, resulting in a waste of spectrum resources, which is not conducive to reducing the blocking rate; 2) the current spectrum allocation for business segmentation Strategy, mostly adopts greedy algorithm, when allocating spectrum resources for multiple sub-services, the impact on subsequent service transmission is not considered; 3) Currently, there is no way to flexibly divide services according to the bandwidth of different idle spectrum blocks on the path The proposed dedicated optical layer device, the segmentation step will be completed by the electrical layer device before the service is sent, so that the service segmentation transmission will consume more Ethernet ports connecting the core router and the transponder; on the other hand, because the multi-flow bandwidth can be Due to the high hardware cost and complex structure of variable transponders, it is more inclined to use single-flow bandwidth variable transponders in actual networks, and business segmentation and transmission will consume more transponders

Therefore, the service segmentation strategy will also bring higher power consumption of equipment ports

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