CN116782063A

CN116782063A - Resource allocation method, device, equipment and readable storage medium

Info

Publication number: CN116782063A
Application number: CN202210223964.7A
Authority: CN
Inventors: 葛大伟; 柳晟; 杨辉; 包博文; 姚秋彦; 李超; 孙政洁; 滕云; 李允博
Original assignee: China Mobile Communications Group Co Ltd; Beijing University of Posts and Telecommunications; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; Beijing University of Posts and Telecommunications; China Mobile Communications Ltd Research Institute
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2023-09-19

Abstract

The application discloses a resource allocation method, a device, equipment and a readable storage medium, relating to the technical field of optical network communication and aiming at improving the utilization rate of optical network resources. The method comprises the following steps: selecting a transmission path according to the service request; acquiring the optical signal to noise ratio of the service request; and when the transmission path is a mixed path of a C-band link and a C+L-band link and the optical signal to noise ratio meets a preset condition, performing resource allocation according to the attribute parameters of the service request. The embodiment of the application can improve the utilization rate of the optical network resources.

Description

Resource allocation method, device, equipment and readable storage medium

Technical Field

The present application relates to the field of optical network communications technologies, and in particular, to a method, an apparatus, a device, and a readable storage medium for allocating resources.

Background

The innovative applications such as video on demand, high definition video conferences and the like grow up rapidly, and explosive flow is injected into a transmission network. This trend has made expansion of the capacity of optical transmission networks urgent in view of the single-mode optical fiber transmission capacity being constrained by the nonlinear shannon limit. At present, the transmission capacity can be improved by band multiplexing, such as a C+L band. Band multiplexing can be used as a promising solution to cope with capacity urgency, and is going from the original C-band to the c+l-band coexisting optical network system.

The traditional C+L band coexisting optical network resource allocation research focuses on the situation that all optical fiber links in the network can use the C+L band, and evaluates the signal to noise ratio aiming at the current service, if a certain frequency spectrum resource meets the condition that the signal to noise ratio of the obtained service exceeds the minimum transmission threshold, corresponding resources are allocated for the service, so that the efficient utilization of the C+L band resource is realized, and the problem of limited capacity of the existing transmission network is solved.

However, for the band multiplexing scheme, band upgrade costs remain a matter of concern. In a specific application, the C-band may be gradually converted to the c+l-band by implementing equipment upgrades and reconfiguration of the fiber link amplifiers at the network part nodes. Therefore, in the process of gradually upgrading the capacity of the optical network, an application scene of C-band and C+L-band mixed (C-C+L) networking is necessarily generated. Therefore, how to allocate resources in such a scenario is also a key factor to consider.

Disclosure of Invention

The embodiment of the application provides a resource allocation method, a device, equipment and a readable storage medium, which are used for improving the utilization rate of optical network resources.

In a first aspect, an embodiment of the present application provides a resource allocation method, including:

selecting a transmission path according to the service request;

Acquiring the optical signal to noise ratio of the service request;

and when the transmission path is a mixed path of a C-band link and a C+L-band link and the optical signal to noise ratio meets a preset condition, performing resource allocation according to the attribute parameters of the service request.

Wherein the method further comprises:

constructing an optical signal to noise ratio evaluation model;

the obtaining the osnr of the service request includes:

and acquiring the optical signal-to-noise ratio according to the optical signal-to-noise ratio evaluation model and the service request.

Wherein the obtaining the osnr according to the osnr evaluation model and the service request includes:

and calculating the optical signal to noise ratio according to the transmitting power of the service request, the noise power of ASE (Amplifier Spontaneous Emission ) noise and the noise power of NLI (Non-Linear Impairment, nonlinear loss).

Wherein the attribute parameters include: the source node of the service request, the destination node of the service request, the bandwidth and the duration.

Wherein, selecting a transmission path according to the service request includes:

and determining a transmission path according to the source node and the destination node, wherein the transmission path comprises one or more optical fiber links.

Wherein the resource allocation according to the attribute parameters of the service request includes:

when the transmission path is a mixed path of a C-band link and a C+L-band link, spectrum resources of the C-band are allocated for the service request;

determining a target modulation mode of the service request according to the bandwidth, wherein a target modulation grade corresponding to the target modulation mode is a modulation grade selected from a plurality of candidate modulation grades for calculating and obtaining the minimum frequency slot number under the condition of obtaining the minimum frequency slot number, and the target modulation grade is lower than a preset modulation grade threshold;

and according to the duration time and the minimum frequency slot number, spectrum resource allocation is carried out for the service request.

Wherein the method further comprises:

and when all the transmission paths are C-band links or C+L-band links and the optical signal to noise ratio meets the preset condition, performing resource allocation according to the attribute parameters of the service request.

when all the transmission paths are C-band links, spectrum resources of a C-band are allocated for the service request; when all the transmission paths are C+L band links, allocating the spectrum resources of the C band and the spectrum resources of the L band for the service request;

And when the service request is allocated with the spectrum resources of the C wave band and the spectrum resources of the L wave band, preferentially allocating the spectrum resources of the L wave band for the service request.

Wherein, the determining the modulation mode of the service request according to the bandwidth includes:

according to the bandwidth, a plurality of preset modulation levels and the preset subcarrier grating intervals of the optical network, a plurality of frequency slots are calculated;

selecting the minimum frequency slot number from the plurality of frequency slot numbers;

and selecting a modulation mode of a target modulation class from one or more candidate modulation classes corresponding to the minimum time slot number, and taking the target modulation mode corresponding to the target modulation class as the modulation mode of the service request.

Wherein the allocating spectrum resources for the service request according to the duration and the minimum number of frequency slots includes:

determining a target service request type of the service request according to the duration time and the minimum frequency slot number;

and according to the target service request type, spectrum resource allocation is carried out for the service request.

Wherein the determining, according to the duration and the minimum number of frequency slots, the target service request type of the service request includes:

when the duration is smaller than or equal to a first time threshold and the minimum frequency slot number is smaller than or equal to a first frequency slot number threshold, determining that the target service request type of the service request is a first type;

when the duration is greater than a first time threshold and less than or equal to a maximum time threshold, and the minimum frequency slot number is less than or equal to a first frequency slot number threshold, determining that the target service request type of the service request is a second type;

when the duration is greater than the first time threshold and less than a maximum time threshold, and the minimum frequency slot number is greater than the first frequency slot number threshold and less than a maximum frequency slot number, determining that the target service request type of the service request is a third type;

And when the duration is smaller than or equal to the first time threshold, the minimum frequency slot number is larger than the first frequency slot number threshold and smaller than or equal to the maximum frequency slot number, determining that the target service request type of the service request is a fourth type.

When the transmission path is a mixed path of a C-band link and a c+l-band link, or when the transmission paths are all C-band links, the allocating spectrum resources for the service request according to the target service request type includes:

when the target service request type is the first type, starting from the high position of the frequency slot index of the C band to search the available frequency slots; when the first available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests are verified, the first available frequency slot is used as the frequency slot of the service request;

when the target service request type is the second type, the third type or the fourth type, starting from the low level of the frequency slot index of the C wave band to search the available frequency slot; when a second available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; and when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests pass the verification, the second available frequency slot is used as the frequency slot of the service request.

When the transmission paths are all c+l band links, the allocating spectrum resources for the service request according to the target service request type includes:

when the target service request type is the first type, starting from the low position of the frequency slot index of the L wave band to search the available frequency slots; when a third available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests are verified, the third available frequency slot is used as the frequency slot of the service request; when the available time slot is not searched, starting from the high position of the frequency slot index of the C band to search the available frequency slot; when the fourth available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests are verified, the fourth available frequency slot is used as the frequency slot of the service request;

when the target service request type is the second type, the third type or the fourth type, starting from the high position of the frequency slot index of the L wave band to search the available frequency slot; when the fifth available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests are verified, the fifth available frequency slot is used as the frequency slot of the service request; when the available time slot is not searched, starting from the high position of the frequency slot index of the C band to search the available frequency slot; when a sixth available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; and when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests pass the verification, the sixth available frequency slot is used as the frequency slot of the service request.

In a second aspect, an embodiment of the present application provides a resource allocation apparatus, including:

the first selection module is used for selecting a transmission path according to the service request;

the second acquisition module is used for acquiring the optical signal to noise ratio of the service request;

and the first allocation module is used for allocating resources according to the attribute parameters of the service request when the transmission path is a mixed path of a C-band link and a C+L-band link and the optical signal to noise ratio meets the preset condition.

Wherein the apparatus further comprises:

the third acquisition module is used for constructing an optical signal to noise ratio evaluation model;

the second obtaining module is configured to obtain the osnr according to the osnr evaluation model and the service request.

The second obtaining module is configured to calculate the optical signal to noise ratio according to the transmission power of the service request, the noise power of the ASE noise of the amplifier, and the noise power of the NLI.

The first selection module is configured to determine a transmission path according to the source node and the sink node, where the transmission path includes one or more optical fiber links.

Wherein the first distribution module comprises:

the first allocation submodule is used for allocating spectrum resources of a C wave band for the service request when the transmission path is a mixed path of a C wave band link and a C+L wave band link;

a first determining submodule, configured to determine a target modulation mode of the service request according to the bandwidth, where a target modulation level corresponding to the target modulation mode is a modulation level selected from a plurality of candidate modulation levels used for calculating and obtaining the minimum number of frequency slots when the minimum number of frequency slots is obtained, and the target modulation level is lower than a preset modulation level threshold;

and the second allocation submodule is used for allocating spectrum resources for the service request according to the duration time and the minimum frequency slot number.

Wherein the apparatus further comprises:

and the second allocation module is used for allocating resources according to the attribute parameters of the service request when the transmission paths are all C-band links or all C+L-band links and the optical signal to noise ratio meets the preset conditions.

Wherein the second distribution module comprises:

the first allocation submodule is used for allocating spectrum resources of a C wave band for the service request when all the transmission paths are C wave band links; when all the transmission paths are C+L band links, allocating the spectrum resources of the C band and the spectrum resources of the L band for the service request;

The first allocation submodule allocates the spectrum resources of the L wave band for the service request preferentially when allocating the spectrum resources of the C wave band and the spectrum resources of the L wave band for the service request.

Wherein the first determination submodule includes:

the calculating unit is used for calculating a plurality of frequency slots according to the bandwidth, a plurality of preset modulation levels and the preset subcarrier grating intervals of the optical network;

a first selecting unit, configured to select a minimum number of frequency slots from the plurality of frequency slots;

and the second selection unit is used for selecting a modulation mode of a target modulation level from one or more candidate modulation levels corresponding to the minimum time slot number, and taking the target modulation mode corresponding to the target modulation level as the modulation mode of the service request.

Wherein the second allocation submodule includes:

a determining unit, configured to determine a target service request type of the service request according to the duration time and the minimum number of frequency slots;

and the allocation unit is used for allocating spectrum resources for the service request according to the target service request type.

Wherein the determining unit is configured to:

The distribution unit is configured to, when the transmission path is a mixed path of a C-band link and a c+l-band link:

Wherein, the allocation unit is configured to, when the transmission paths are all c+l band links:

In a third aspect, an embodiment of the present application provides a resource allocation apparatus, including: a processor and a transceiver;

wherein the processor is configured to:

selecting a transmission path according to the service request; acquiring the optical signal to noise ratio of the service request; and when the transmission path is a mixed path of a C-band link and a C+L-band link and the optical signal to noise ratio meets a preset condition, performing resource allocation according to the attribute parameters of the service request.

Wherein the processor is further configured to:

constructing an optical signal to noise ratio evaluation model;

Wherein the processor is further configured to:

and calculating the optical signal to noise ratio according to the transmitting power of the service request, the noise power of the spontaneous emission ASE noise of the amplifier and the noise power of the nonlinear loss NLI.

Wherein the processor is further configured to:

Wherein the processor is further configured to: when the transmission path is a mixed path of a C-band link and a C+L-band link:

Wherein the processor is further configured to: when the transmission paths are all c+l band links:

In a third aspect, an embodiment of the present application further provides a communication device, including: a transceiver, a memory, a processor and a program stored on the memory and executable on the processor, which processor when executing the program implements the steps in the resource allocation method as described above.

In a fourth aspect, embodiments of the present application also provide a readable storage medium having stored thereon a program which, when executed by a processor, implements the steps in the resource allocation method as described above.

In the embodiment of the application, for the acquired service request, a transmission path is selected, and when the transmission path is a mixed path of a C-band link and a C+L-band link and the optical signal to noise ratio meets a preset condition, resource allocation is performed according to the attribute parameters of the service request. Therefore, by using the scheme of the embodiment of the application, the spectrum allocation can be performed in a targeted manner according to the corresponding wave band of the transmission path and the attribute parameters of the service request, thereby improving the utilization rate of the optical network resources.

Drawings

FIG. 1 is a schematic diagram of a hybrid C-C+L optical network upgrade and transmission;

FIG. 2 is one of the flowcharts of the resource allocation method provided by the embodiment of the present application;

FIG. 3 is a schematic diagram of a band selection principle according to an embodiment of the present application;

fig. 4 is a schematic diagram of service request type division according to an embodiment of the present application;

fig. 5 is a schematic diagram of a spectrum resource allocation manner according to an embodiment of the present application;

FIG. 6 is a second flowchart of a resource allocation method according to an embodiment of the present application;

FIG. 7 is a block diagram of a resource allocation apparatus according to an embodiment of the present application;

fig. 8 is a second block diagram of a resource allocation apparatus according to an embodiment of the present application.

Detailed Description

In the embodiment of the application, the term "and/or" describes the association relation of the association objects, which means that three relations can exist, for example, a and/or B can be expressed as follows: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The term "plurality" in embodiments of the present application means two or more, and other adjectives are similar.

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The capacity expansion and upgrading of the optical network can be performed regularly, so that the increase of upgrading cost is delayed, and deployed services are managed gradually. Operators may choose to postpone the upgrade process to be cost effective because development of new technology and reduction of equipment costs require appropriate upgrade time. Therefore, the mixed networking scene of the C frequency band and the C+L frequency band is one of the choices, and accords with the current situation. This scenario allows for the first upgrade of some fiber links and devices, such as OXCs (Optical Cross-Connect), optical amplifiers, etc., according to certain upgrade rules, with the mixed C-c+l transmission considered as shown in fig. 1. It is assumed that a high spectrum utilization link will first upgrade to the C + L band, such as link CE and link DF. Then node C, D, E, F should also be upgraded to support c+l band switching. For amplification and switching of the c+l band reference is made to prior art amplifier and OXC arrangements. Typically, the C, L band optical signals need to be amplified and switched separately after passing through the demultiplexer and then coupled to the optical fiber for transmission through the multiplexer.

Further, assume that the network is represented as an undirected graph G (V, E), where V represents a set of nodes in the network and E represents a set of network bi-directional fiber links, including C-band links and c+l multi-band links. Each link will be divided into spans according to the length of the largest single span. On the C+L frequency band link, the C and L frequency band signals are amplified by different configuration parameters through the erbium-doped amplifier respectively.

Based on the above description, it can be seen that in the process of gradually upgrading the capacity of the optical network, an application scenario of C-band and c+l-band mixed (C-c+l) networking will necessarily occur. The resource allocation method in this scenario also gradually becomes a key factor for improving the resource utilization rate of the optical network. However, the prior art does not take this important scenario into account, and is therefore more difficult to adapt to the current optical network topology that is gradually upgraded from the C-band to the c+l-band.

In addition, the damage influence of the current service on other services in the network after the resource allocation is completed is not considered in the prior art, so that the situation that the service in the network is judged to be failed is not only improved, but also more aggravated, and further, whether the current service is really suitable for high-efficiency transmission in certain frequency spectrum positions is difficult to effectively evaluate. Meanwhile, the transmission of the service not only has the resource occupation on the frequency domain, but also needs to be considered to improve the utilization rate of the network resource because the transmission of the service needs a certain process from the time domain, and the situation of the resource time domain occupation will necessarily occur, however, the prior art does not consider the content.

In order to solve the above problems, an embodiment of the present application provides a resource allocation method.

Referring to fig. 2, fig. 2 is a flowchart of a resource allocation method provided by an embodiment of the present application, as shown in fig. 2, including the following steps:

step 201, selecting a transmission path according to the service request.

Wherein the service request may be considered as an optical signal service request. Wherein, the attribute parameters of the service request may include: the source node of the service request, the destination node of the service request, the bandwidth and the duration.

For example, in an embodiment of the present application, a service request may be defined as: r (s, d, b, t), where s, d, b, and t represent the source node, sink node, bandwidth size, and duration, respectively, of the service request. For each service request or optical signal service request in the network, on the premise of meeting the furthest transmission distance under the constraint of the signal-to-noise ratio of the optical signal, any modulation mode can be adopted, and m is adopted to represent the adopted modulation grade.

In this step, a transmission path is determined from the source node and the sink node, the transmission path comprising one or more optical fiber links. The transmission path formed by the one or more optical fiber links may be a C-band link, an L-band link, or a c+l-band link.

Specifically, for each service request r (s, d, b, t) reaching the network, in the embodiment of the present application, according to the source-sink (s-d) node requirement of the service request, the transmission distance between the transmission path and the corresponding transmission distance of the service request can be calculated for the service request through the shortest path policy, and each transmission path can include one or more optical fiber links.

Step 202, obtaining the optical signal to noise ratio of the service request.

In this embodiment, the osnr may be obtained according to the osnr evaluation model and the service request. Specifically, the optical signal to noise ratio may be calculated according to the transmission power of the service request, the noise power of the ASE noise of the amplifier, and the noise power of the NLI.

The osnr evaluation model may be preset, or may be constructed in the process of executing the embodiment of the present application. Thus, optionally, in an embodiment of the present application, constructing an osnr evaluation model may be further included.

In the process of constructing the optical signal-to-noise ratio evaluation model, linear damage and nonlinear damage caused by an optical signal of an optical network in an optical fiber are comprehensively considered, and the optical signal-to-noise ratio value of the optical signal in the network after being damaged is quantitatively evaluated, so that the optical signal-to-noise ratio quantitative evaluation model is formed.

Specifically, in this step, the SNR of the currently received optical signal service request r ^r Can be calculated from equation (1) which contains the amplifier spontaneous emission noise (ASE) fraction and the nonlinear impairment (NLI) fraction.

Wherein P represents the optical signal transmission power of the service request or the optical signal service request,represents the noise power from ASE and can be calculated by equation (2), the +.>Represents the noise power from the NLI and can be calculated by equation (3).

Wherein n is _sp Indicating the spontaneous emission coefficients of the amplifier (different bands employ different coefficients to achieve the mixed band estimation), h indicating the planck coefficient. N (N) _l Representing the number of spans of the optical signal on the optical fiber link,representing the length of the s-th span of the optical signal on the optical fiber link. Alpha represents the attenuation coefficient of the optical signal in the optical fiber. P is p ^r 、f _r And br represent the path, center frequency, and required bandwidth of the optical signal service request, respectively. />And->The self-channel interference and the cross-channel interference received by the optical signal service request are respectively represented, and can be calculated by a formula (4) and a formula (5) respectively.

For an existing service request r ' (s ', d ', b ', t '), where s ', d ', b ', and t ' represent the source node, sink node, bandwidth size, and duration, respectively, of the existing service request.

Wherein f _r' Represents the center frequency of the existing optical signal service request, D _l Represents the number of service requests deployed on the optical fiber link, P represents the optical signal transmission power of the service request or the optical signal service request, gamma represents the nonlinear coefficient of the optical fiber, C _k Representing the linear regression slope of the normalized raman gain spectrum. First parameter phi _r And a second parameter phi _r,r' Calculated from equation (6) and equation (7), respectively.

φ _r ＝β ₂ +2πβ ₃ f _r (6)

φ _r,r' ＝[β ₂ +πβ ₃ (f _r +f _r' )](f _r' -f _r ) (7)

Wherein beta is ₂ And beta ₃ Respectively represent the corresponding linear slopes of the different group velocity dispersion parameters.

And 203, when the transmission path is a mixed path of a C-band link and a C+L-band link and the optical signal to noise ratio meets a preset condition, performing resource allocation according to the attribute parameters of the service request.

In the embodiment of the present application, the transmission types may be divided into: all links are paths of C-band links, mixed paths of C-band links and C+L-band links, and all links are paths of C+L-band links. In the embodiment of the application, if a link expands transmission capacity, i.e. expands from the original C-band to the c+l-band, then the node connected to the link should also be upgraded to support multi-band signal switching.

That is, in a hybrid C-c+l band optical network, there may be three different types of paths above for different requests.

Correspondingly, in the embodiment of the application, when the transmission path is a mixed path of a C-band link and a c+l-band link and the optical signal to noise ratio meets a preset condition, resource allocation can be performed according to the attribute parameter of the service request, and when the transmission path is all the C-band link or all the c+l-band link and the optical signal to noise ratio meets the preset condition, resource allocation can be performed according to the attribute parameter of the service request.

The osnr meets a preset condition, where the osnr is greater than or equal to a preset threshold, and the threshold may be set as required.

Aiming at a transmission path corresponding to a service request, if all links are paths of C-band links, allocating spectrum resources of the C-band for the service request; if the mixed path of the C-band link and the C+L-band link is the case, the spectrum resources of the C-band are allocated for the service request because part of the links can not use the spectrum resources of the L-band; if all links are paths of the C+L band links, spectrum resources of the C band are allocated for the service request, spectrum resources of the L band can be allocated for the service request, and spectrum resources of the L band are preferentially selected to relieve available resource utilization pressure of the C band under the condition of other two paths.

Fig. 3 is a schematic diagram of a band selection principle in an embodiment of the present application. Based on the above principle, for the service request r ₁ (source and sink nodes are 2 and 6 respectively), r ₂ (source and sink nodes are 2 and 4 respectively), r ₃ (source and sink nodes 1 and 4, respectively), … …, the allocated spectrum resources are shown in fig. 3.

In the embodiment of the application, resource allocation is performed in different manners for different types of transmission paths. The resource allocation process comprises the processes of band selection, modulation selection, spectrum allocation and the like. The resource allocation procedure is described below in connection with different transmission paths.

(1) Band selection

As described above, when the transmission path is a mixed path of a C-band link and a c+l-band link, spectrum resources of the C-band are allocated to the service request. When all the transmission paths are C-band links, spectrum resources of a C-band are allocated for the service request; and when all the transmission paths are C+L band links, allocating the frequency spectrum resources of the C band and the frequency spectrum resources of the L band for the service request.

(2) Modulation selection

In this step, a target modulation mode of the service request is determined mainly according to the bandwidth, where a target modulation level corresponding to the target modulation mode is a modulation level selected from a plurality of candidate modulation levels used for calculating and obtaining the minimum number of frequency slots when the minimum number of frequency slots is obtained, and the target modulation level is lower than a preset modulation level threshold. The preset modulation level threshold value can be set according to requirements.

Specifically, when determining the modulation mode, the number of the plurality of frequency slots is calculated according to the bandwidth, a plurality of preset modulation levels and the preset subcarrier grating interval of the optical network. Then, a minimum number of frequency slots is selected from the plurality of frequency slots. And then, selecting a modulation mode of a target modulation class from one or more candidate modulation classes corresponding to the minimum time slot number, and taking the target modulation mode corresponding to the target modulation class as the modulation mode of the service request.

In general, for each service request r (s, d, b, t) of an optical signal reaching the network, there may be different number of frequency slots requirements when different modulation levels are adopted, and in particular, the number of frequency slots may be calculated by the formula (8).

Wherein C is _slot Representing a predetermined subcarrier grating spacing of the optical network, B _r Indicating the number of frequency slots. As can be seen from the analysis of equation (8), the number of required frequency slots for a service request for the same optical signal may generally decrease with the increase of the modulation level used, but there may be cases where the same number of required frequency slots is calculated when the optical signal uses different modulation levels. At the same time, as the modulation level of the optical signal increases, the anti-interference capability of the optical signal decreases, which is seriously affected by The furthest transmission distance of the optical signal under the constraint threshold of the predetermined optical signal to noise ratio is set, so that the optical signal under the same distance has higher degradation tolerance of the optical signal to noise ratio when the low-level modulation mode is adopted than when the high-level modulation mode is adopted. Based on this, in the embodiment of the present application, when the minimum spectrum resource overhead is guaranteed, that is, the minimum number of frequency slots is calculated, the optical signal is modulated by preferentially selecting the modulation mode with the lower modulation level from the multiple modulation levels. By the modulation selection mode, each optical signal service request reaching the network consumes the least frequency gap resources, and the degradation tolerance of the optical signal to noise ratio of the optical signal is improved.

(3) Spectrum allocation

In the process, determining a target service request type of the service request according to the duration time and the minimum frequency slot number, and allocating spectrum resources for the service request according to the target service request type.

Specifically, for each service request r (s, d, b, t) of an optical signal reaching a network, the minimum frequency slot number required by the service request is obtained through calculation, the demand characteristic of the service request in the frequency domain is obtained, and the time-frequency demand two-dimensional characteristic of the service request is formed by combining the time-domain demand characteristic of the service request in the duration t of the service request in the network. In view of this two-dimensional feature, as shown in connection with fig. 4, each service request arriving at the network can be divided into four types:

A first type: when the duration is less than or equal to a first time threshold and the minimum number of slots is less than or equal to a first number of slots threshold, determining that the target service request type of the service request is a first type, that is, the service request has a small frequency slot requirement and a short duration, which is denoted as CL ₁ ，B _r ≤B _threshold And t is _r ≤t _threshold ；B _threshold Representing a first frequency slot number threshold, t _threshold Representing a first time threshold;

the second type: when the duration is greater than the first time threshold and less than or equal to the maximum time threshold, the minimum frequency gap number is less than or equal to the first time thresholdWhen a threshold value of the number of frequency slots is used, determining that the target service request type of the service request is the second type, namely that the frequency slot requirement of the service request is small and long in duration, and marking the service request as CL ₂ ，B _r ≤B _threshold And t is _threshold <t _r ≤t _max ；t _max Representing a maximum time threshold;

third type: and when the duration is greater than the first time threshold and less than the maximum time threshold, and the minimum number of frequency slots is greater than the first frequency slot number threshold and less than the maximum number of frequency slots, determining that the target service request type of the service request is a third type, namely that the frequency slot requirement of the service request is large and the duration is long. Denoted as CL ₃ ，B _threshold <B _r ≤B _max And t is _threshold <t _r ≤t _max ；B _max Representing the maximum frequency slot number;

Fourth type: when the duration is less than or equal to the first time threshold, the minimum number of slots is greater than the first number of slots threshold and less than or equal to the maximum number of slots, determining that the target service request type of the service request is a fourth type, that is, the service request has a large slot demand and a short duration, denoted as CL ₄ ，B _threshold <B _r ≤B _max And t is _r ≤t _threshold 。

For different types of transmission paths, as shown in fig. 5, there are different spectrum resource allocation manners:

(1) When the transmission path is a mixed path of a C-band link and a C+L-band link:

when the target service request type is the first type, starting from the high position of the frequency slot index of the C band to search the available frequency slots; when the first available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests are verified, the first available frequency slot is used as the frequency slot of the service request; otherwise, the service is refused or blocked.

When the target service request type is the second type, the third type or the fourth type, starting from the low level of the frequency slot index of the C wave band to search the available frequency slot; when a second available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests are verified, the second available frequency slot is used as the frequency slot of the service request; otherwise, the service is refused or blocked.

(2) When the transmission paths are all c+l band links:

when the target service request type is the second type, the third type or the fourth type, starting from the high position of the frequency slot index of the L wave band to search the available frequency slot; when the fifth available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests are verified, the fifth available frequency slot is used as the frequency slot of the service request; when the available time slot is not searched, starting from the high position of the frequency slot index of the C band to search the available frequency slot; when a sixth available frequency slot is searched, verifying the optical signal-to-noise ratio corresponding to the optical signal-to-noise ratio and other service requests; and when the optical signal to noise ratio and the optical signal to noise ratio corresponding to other service requests pass the verification, the sixth available frequency slot is used as the frequency slot of the service request. If the applicable available resources cannot be searched through all the searching modes or the verification and the repetition do not pass, the service is judged to be refused or blocked.

In the embodiment of the application, a resource allocation method for a hybrid C-C+L band optical network is provided. The method comprises the steps of constructing a mixed C-C+L band optical signal to noise ratio evaluation model, designing route calculation, band selection, modulation selection and spectrum allocation in the damage perception resource allocation process, so as to accurately evaluate damage to optical signal services caused by multi-band coexistence in a network, combining the duration characteristics of the optical signal services in the network on the premise of ensuring the minimum optical signal to noise ratio threshold, comprehensively completing route, band, modulation and spectrum selection in the optical signal route construction process, and performing damage verification on other existing services in the network, which are affected by the damage to the optical signal services, so as to review that the optical signal to noise ratio of other existing services in the network is not lower than the original threshold, and finally improve the network resource utilization efficiency and realize network capacity expansion.

The method for constructing the hybrid C-C+L band optical signal to noise ratio evaluation model can refer to the description of the previous embodiment.

Referring to fig. 6, fig. 6 is a flowchart of a resource allocation method provided by an embodiment of the present application, as shown in fig. 6, including the following steps:

step 601, a service request is received.

In an embodiment of the present application, the service request may be defined as: r (s, d, b, t), where s, d, b, and t represent the source node, sink node, bandwidth size, and duration, respectively, of the service request. For each service request or optical signal service request in the network, on the premise of meeting the furthest transmission distance under the constraint of the signal-to-noise ratio of the optical signal, any modulation mode can be adopted, and m is adopted to represent the adopted modulation grade.

In the multi-band optical network, the resource allocation process comprises route calculation, band selection, modulation selection and spectrum allocation, and the application additionally adds an optical signal to noise ratio verification step to ensure that all service requests of the network global meet the constraint condition of the optical signal to noise ratio threshold. The implementation of each process is described in detail below.

Step 602, route calculation: and calculating the shortest path as a candidate transmission path for the service request according to the source and destination nodes of the service request.

Wherein the candidate transmission paths may include one or more. When a plurality of transmission paths are included, one of them may be selected as a transmission path, or the transmission path may be selected according to some algorithm.

Step 603, calculating the sum of the lengths of all links on the currently selected transmission path as the transmission distance of the service request.

Step 604, band selection:

and when the transmission path is a mixed path of a C-band link and a C+L-band link, allocating spectrum resources of the C-band for the service request. When all the transmission paths are C-band links, spectrum resources of a C-band are allocated for the service request; and when all the transmission paths are C+L band links, allocating the frequency spectrum resources of the C band and the frequency spectrum resources of the L band for the service request.

Step 604, modulation selection: and selecting the minimum modulation grade of the frequency gap number required by the minimum service.

The selection of the minimum adjustment level may be described with reference to the foregoing embodiments. In practical application, the modulation mode of the minimum modulation class can be utilized to modulate the service request. By the modulation selection mode, each optical signal service request reaching the network consumes the least frequency gap resource, and the degradation tolerance of the optical signal to noise ratio of the optical signal service request is improved.

Step 605, dividing the service request into different categories according to the minimum number of slots and duration t required by the service request: CL (CL) ₁ 、CL ₂ 、CL ₃ Or CL ₄ . The specific dividing method may be described with reference to the foregoing embodiments.

Step 606, spectrum allocation:

in this process, it may be first determined whether the links in the transmission path are all c+l links. If yes, the following (1) is executed, otherwise the following (2) is executed.

(1) For the path situation that all links are C+L band links

This will give preference to using L-band spectrum resources to reduce the available resource pressure of the C-band in the case of the other two paths. Thus, if the service request corresponds to the CL ₁ The type is that spectrum allocation is carried out in the L band by adopting a first hit mode preferentially, namely available frequency slot sequential search is carried out from the low position of the L band frequency slot index, once available resources are searched, service optical signal-to-noise ratio verification and other service optical signal-to-noise ratio rechecking in a network can be carried out, if verification and rechecking pass, current resources are used for the service spectrum allocation, otherwise, spectrum allocation is carried out in the C band by adopting a tail hit mode, namely available frequency slot reverse search is carried out from the high position of the C band frequency slot index, once available resources are searched, service optical signal-to-noise ratio verification and other service optical signal-to-noise ratio rechecking in the network can be carried out, if verification and rechecking pass, current resources are used for the service spectrum allocation, otherwise, if applicable available resources are not searched or verification and rechecking pass, applicable resources can not be considered to be found, and the service is refused or blocked.

If the service request corresponds to CL ₂ 、CL ₃ CL (CL) ₄ The type is that spectrum allocation is carried out in the L-band by adopting a tail hit mode preferentially, namely, available frequency slot reverse order search is carried out from the high position of the index of the L-band frequency slot, once available resources are searched, the service optical signal-to-noise ratio verification and the other service optical signal-to-noise ratio recheck in the network are carried out, if the verification is carried outAnd if the current resource passes the recheck, the current resource is used for the service spectrum allocation, otherwise, the spectrum allocation is carried out in a tail hit mode in the C band, namely, the available frequency slot is searched in a reverse order from the high position of the frequency slot index of the C band, once the available resource is searched, the service optical signal to noise ratio verification and the recheck of other service optical signal to noise ratios in the network are carried out, if the verification and the recheck pass, the current resource is used for the service spectrum allocation, otherwise, the process is carried out downwards. Finally, if the applicable available resources cannot be searched or the verification and the review are not passed, the applicable resources cannot be found, and the service is judged to be refused or blocked.

(2) For the path of all links being C-band links or the mixed path situation of C-band links and C+L-band links

This will only use C band spectrum resources if the service request corresponds to CL ₁ Performing spectrum allocation in a tail hit mode in a C band, namely performing available frequency slot reverse order search from the high position of a C band frequency slot index, performing optical signal to noise ratio verification of the service and optical signal to noise ratio rechecking of other services in a network once the available resources are searched, if the verification and rechecking pass, using the current resources for the service spectrum allocation, otherwise, judging that the service is refused or blocked, and judging that the applicable resources cannot be found; if the service request corresponds to CL ₂ 、CL ₃ CL (CL) ₄ The type is that spectrum allocation is carried out in a first hit mode in the C band preferentially, namely available frequency slot sequential search is carried out from the lower position of the index of the C band frequency slot, once available resources are searched, service optical signal-to-noise ratio verification and other service optical signal-to-noise ratio rechecking in the network can be carried out, if the verification and rechecking pass, the current resources are used for the service spectrum allocation, otherwise, applicable resources can not be found, and the service is refused or blocked.

As can be seen from the above description, the following effects can be achieved by using the scheme of the embodiment of the present application:

for the optical network of the mixed C-C+L wave band, in the embodiment of the application, different wave bands are considered to be amplified by different amplifiers, so that different values are adopted for the amplifier coefficients in the optical signal to noise ratio of the service to adapt to the evaluation modes in the transmission of different wave bands.

The optical signal path establishment process of the optical network in the embodiment of the application is oriented to the mixed C-C+L band optical network, and mainly considers that part of links and nodes in the network are upgraded to the C+L band, but part of links and nodes still keep the C band range, so that the optical signal path establishment method is more suitable for the transition process of operators from the C band to the C+L band step by step.

The modulation selection in the optical network resource allocation of the embodiment of the application preferably selects the modulation mode with lower modulation level to modulate the optical signal on the premise of ensuring the minimum frequency spectrum resource overhead, namely calculating the minimum frequency slot number. By the modulation selection mode, each optical signal service request reaching the network consumes the least frequency gap resources, and the degradation tolerance of the optical signal to noise ratio of the optical signal is improved.

According to the method, the frequency spectrum allocation in the optical network resource allocation is selected according to different paths, different available wave band ranges are adopted, and the self-adaptive differential frequency spectrum allocation principle is adopted in combination with the optical signal service transmission duration characteristic, so that the network resource utilization efficiency of the method is effectively improved.

The embodiment of the application also provides a resource allocation device. Referring to fig. 7, fig. 7 is a block diagram of a resource allocation apparatus according to an embodiment of the present application. As shown in fig. 7, the resource allocation apparatus 700 includes:

a first selection module 701, configured to select a transmission path according to a service request; a second obtaining module 702, configured to obtain an osnr of the service request; and the first allocation module 703 is configured to allocate resources according to the attribute parameter of the service request when the transmission path is a mixed path of a C-band link and a c+l-band link and the osnr meets a preset condition.

Wherein the apparatus further comprises:

Wherein the first distribution module comprises:

Wherein the apparatus further comprises:

Wherein the second distribution module comprises:

Wherein the first determination submodule includes:

Wherein the second allocation submodule includes:

Wherein the determining unit is configured to:

The device provided by the embodiment of the present application may execute the above method embodiment, and its implementation principle and technical effects are similar, and this embodiment will not be described herein.

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The embodiment of the application also provides a resource allocation device. Referring to fig. 8, fig. 8 is a block diagram of a resource allocation apparatus according to an embodiment of the present application. As shown in fig. 8, the resource allocation apparatus according to the embodiment of the present application includes: a processor 801 and a transceiver 802;

Wherein the processor 801 is configured to:

Wherein the processor 801 is further configured to:

constructing an optical signal to noise ratio evaluation model;

Wherein the processor 801 is further configured to:

Wherein the processor 801 is further configured to: when the transmission path is a mixed path of a C-band link and a C+L-band link:

Wherein the processor 801 is further configured to: when the transmission paths are all c+l band links:

The embodiment of the application provides communication equipment, which comprises the following components: a memory, a processor, and a program stored on the memory and executable on the processor; the processor is configured to read a program in the memory to implement the steps in the resource allocation method as described above.

The embodiment of the application also provides a readable storage medium, and the readable storage medium stores a program, which when executed by a processor, implements each process of the above-mentioned resource allocation method embodiment, and can achieve the same technical effects, so that repetition is avoided, and no further description is provided herein. The readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic memories (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical memories (e.g., CD, DVD, BD, HVD, etc.), semiconductor memories (e.g., ROM, EPROM, EEPROM, nonvolatile memories (NAND FLASH), solid State Disks (SSD)), etc.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. In light of such understanding, the technical solutions of the present application may be embodied essentially or in part in the form of a software product stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a cell phone, computer, server, air conditioner, or network device, etc.) to perform the methods described in the various embodiments of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. A method for resource allocation, comprising:

selecting a transmission path according to the service request;

acquiring the optical signal to noise ratio of the service request;

2. The method according to claim 1, wherein the method further comprises:

constructing an optical signal to noise ratio evaluation model;

the obtaining the osnr of the service request includes:

3. The method of claim 2, wherein the obtaining the osnr according to the osnr evaluation model and the service request comprises:

4. The method of claim 1, wherein the attribute parameters include: the source node of the service request, the destination node of the service request, the bandwidth and the duration.

5. The method of claim 4, wherein selecting a transmission path according to a service request comprises:

6. The method of claim 4, wherein the allocating resources according to the attribute parameters of the service request comprises:

7. The method according to claim 4, wherein the method further comprises:

8. The method of claim 7, wherein the allocating resources according to the attribute parameters of the service request comprises:

9. The method of claim 8, wherein the service request is preferentially allocated with spectral resources of the L-band when allocating spectral resources of the C-band and spectral resources of the L-band for the service request.

10. The method according to claim 6 or 8, wherein said determining a modulation scheme of the service request according to the bandwidth comprises:

11. The method according to claim 6 or 8, wherein said allocating spectrum resources for said service request according to said duration and said minimum number of frequency slots comprises:

12. The method of claim 11, wherein said determining the target service request type of the service request based on the duration and the minimum number of slots comprises:

13. The method of claim 12, wherein when the transmission path is a mixed path of a C-band link and a c+l-band link, or when the transmission path is all C-band links, the allocating spectrum resources for the service request according to the target service request type includes:

14. The method of claim 12, wherein when the transmission paths are all c+l band links, the allocating spectrum resources for the service request according to the target service request type comprises:

15. A resource allocation apparatus, comprising:

16. A resource allocation apparatus, comprising: a processor and a transceiver;

wherein the processor is configured to:

17. A communication device, comprising: a memory, a processor, and a program stored on the memory and executable on the processor; -characterized in that the processor is arranged to read a program in a memory for implementing the steps in the resource allocation method according to any of the claims 1 to 14.

18. A readable storage medium storing a program, wherein the program when executed by a processor performs the steps in resource allocation according to any one of claims 1 to 14.