JP6663384B2 - Resource allocation method and resource allocation device - Google Patents

Description

  The present invention relates to a resource allocation method and a resource allocation device.

  At present, there is an era in which various data such as voices, images, and high-definition images can be freely communicated around the world via the Internet using personal computers and smartphones. An optical communication network supporting such worldwide communication includes a network management control technology such as an optical path for connection management of an optical signal, and a wavelength division multiplex transmission device (WDM device) for relay transmission of an optical signal. ) And an optical add / drop multiplexer (OADM device), and a transmission line such as an optical fiber connecting each device.

  In recent years, the application of digital signal processing (DSP) technology in the field of optical communication has led to the increase and extension of communication capacity in optical transmission technology. An optical communication network with a high degree of freedom is configured by combining with contention-less and multi-way routes.

  As described above, the capacity of an optical communication network has been increased by 5 digits or more in the past thirty years, but the physical capacity of a single mode optical fiber (SMF), which is an optical fiber as a transmission path, has been increased. Due to the transmission limit, it is predicted that the transmission capacity that can be transmitted by one SMF will reach its limit around 100 Tb / s. For this reason, in recent years, a spatial multiplexing division (SDM) technology utilizing the spatial degree of freedom (multiple cores, multiple propagation modes) of an optical fiber has been proposed, and research and development have been active at many domestic and overseas institutions.

  In order to configure an optical communication network supported by such SDM technology, an optical relay transmission device for efficiently and economically controlling the route of a large-capacity optical signal is required. The design technology of the optical path connecting the start point and the end point of the optical signal for setting up the communication uses the frequency resources of the optical communication network efficiently and maximizes the degree of spatial freedom provided by the SDM technology. It is also an important technology to utilize. Hereinafter, the frequency resource related to the optical path is referred to as “optical frequency resource”.

  On the other hand, in the design of the optical path, the setting of the transparent optical path that does not execute the regenerative relay processing of the optical signal in the relay section between the optical transmission devices based on the communication setting request makes the optical network economical. Important above.

  In order to efficiently construct a transparent optical path network, select a communication path on the optical communication network according to the communication setting request to the optical communication network, and make the selected communication path end-to-end transparent. In order to realize this, there is a problem that an optical frequency resource (wavelength of an optical signal) to be allocated to a communication path is appropriately determined under a condition that a common free wavelength is used on a communication path (wavelength continuity constraint). It becomes one of. This problem is called an RWA (Routing and Wavelength Assignment) problem, and is also known as a non-deterministic polynomial (NP) complete problem.

  In an elastic optical network in which the frequency width of a variable band is allocated as an optical frequency resource to be allocated to a communication path, an RSA (Routing and Spectrum Assignment) problem in which the above RWA problem is more complicated has also been a problem. The frequency width is the width of the frequency band of the optical signal, and indicates a difference between different frequencies.

  Further, in the optical communication network supported by the above-mentioned SDM technology, the problem of RSSA (Routing, Spectrum and Spatial Assignment) due to an increase in the degree of freedom in space has also been a problem.

  Regarding the RSSA problem in a transparent optical path network, a communication path and a resource allocation method will be described.

  FIG. 11 is a diagram showing a conventional RSSA method. In the communication path and resource allocation method as shown in FIG. 11, first, a communication path is determined by a communication path search process. Algorithms used for searching for and determining a communication path include, for example, a shortest path algorithm, a shortest-hop method that minimizes the number of hops in the communication path, and a method that minimizes the physical distance of the communication path in the network. Shortest Distance method.

  Next, resources (spatial multiplexing paths and optical frequency resources) that can be assigned to the path are searched for in an available resource search process with reference to the communication path determined by these algorithms. Here, a set of a communication path and a resource that satisfies the wavelength continuity constraint and the spatial multipath constraint is searched. The term “spatial multiplexing path constraint” means that in an optical network using SDM technology, for example, when a multi-core fiber is used as the optical multiplexing path using a spatial multiplexing path, crosstalk of optical signals between cores degrades transmission quality. This means that a core (spatial multiplexing path) to which an optical path can be assigned on an end-to-end basis is used in consideration of the amount of crosstalk between cores in an optical transmission line or an optical node.

  Next, resources (spatial multiplexing paths and optical frequency resources) are allocated with reference to a set of communication paths and resources that satisfy these constraints.

  Algorithms used for assigning wavelengths, which are examples of optical frequency resources, include, for example, First-fit method (hereinafter abbreviated as “λ-FF method”), Most-used method, and LF (Least-fragmentation) method. (For example, see Non-Patent Documents 1 and 2). In the λ-FF method, when there are a plurality of wavelengths that can be assigned end-to-end when selecting the wavelength of an optical signal on a communication path, the wavelength is assigned to the wavelength with the smallest number. Assign in order. The Most-used method detects wavelengths used in the entire network and preferentially uses the wavelengths used most. The LF method obtains a correlation amount between a wavelength usage state of each link on a communication path and a wavelength usage state of an adjacent link, and calculates a correlation amount for each communication path section from a wavelength that suppresses the occurrence of a section where the wavelength usage state is fragmented. Use preferentially.

  The algorithm used for allocating the spatial multiplexing path includes, for example, a First-fit method (hereinafter, referred to as a “Space-FF method”) that allocates the numbers assigned to the spatial multiplexing path in ascending order of the number. Abbreviated.).

H. Zang, et al., "A Review of Routing and Wavelength Assignment Approaches for Wavelength-Routed Optical WDM Networks", Optical Networks Magazine, 2000, p.47-60. Y. Sone, et al., "Efficient Routing and Wavelength Assignment Algorithm Minimizes Wavelength Fragmentations in WDM Mesh Networks", OECC 2011, 6A1_4, 2011, p.178-179

  A communication path and a resource allocation scheme in an SDM optical network can effectively and efficiently use optical frequency resources and spatial multiplexing resources of a transparent optical path network, and are expected to economically construct and operate an optical communication network. The communication path and the resource allocation method in the conventional SDM optical network have the following problems.

  FIG. 12 is a diagram illustrating an example of a physical model of a network according to the conventional RSSA method. For example, a case will be described in which the λ-FF method is used as a wavelength assignment algorithm and the Space-FF method is used as a spatial multipath assignment algorithm, and the network topology is a 3 × 3 lattice network as shown in FIG. The optical fiber of each link is an MCF (multi-core fiber) having three cores, and the upper limit of the number of usable wavelengths of each optical fiber core is four. In FIG. 12, for simplicity, as an example, the optical path is set on the path of link 1-link 2-link 3-link 4 between the first node (N1) and the ninth node (N9) based on the communication setting request. It is assumed that it occurs only in the communication path candidate 1). As shown in FIG. 13, core numbers 1 to 3 are assigned to three cores of the MCF, respectively.

  FIG. 14 is a diagram illustrating an example of a start node number and an end node number in response to a communication setting request. FIG. 15 is a diagram showing an example of assignment of a communication path, a spatial multiplexing path, and an optical frequency resource (here, a wavelength) according to the conventional RSSA method. Each link is associated with a core number and a wavelength number. The assignment to the communication setting request is shown. As shown in FIG. 15, it is assumed that the network is in a wavelength usage state in which the communication setting request C-17 shown in FIG. 14 is set by the conventional RSSA method. When the transmission quality due to the influence of crosstalk between cores and the like in the entire network is considered, an optical path having a transmission distance corresponding to the number of hops 1, 2, 3, and 4 can be set for the cores of core numbers 1 and 3. It is assumed that an optical path having a transmission distance corresponding to the hop numbers 1 and 2 can be set in the core having the core number 2. Here, the conventional RSSA method searches for a wavelength continuity constraint and a spatial multiplexing path constraint for a communication request setting generated from a start node to an end node, and then applies a Space-FF method as a spatial multiplexing resource allocation algorithm. After that, a wavelength to be used is determined by a resource allocation method to which the λ-FF method is applied as a wavelength resource allocation algorithm.

  In the conventional RSSA system, a communication setting request of the communication setting request C-18 in FIG. 14 (an optical path setting request from the first node (N1) to the eighth node (N8)) is made based on the resource usage status shown in FIG. After searching for the wavelength continuity constraint and the spatial multiplexing constraint, according to the resource allocation of the Space-FF method and the λ-FF method, the free wavelengths of the link 1, the link 2 and the link 3 of the core number 3 and the wavelength number 4 are obtained. Will use resources. FIG. 16 shows an example of the correspondence between the link number, the core number, and the wavelength number in this state.

  In an SDM network, transmission quality may differ from core to core due to crosstalk between cores. Therefore, if the wavelength utilization rate of a core having good transmission characteristics, that is, a core having a small number of adjacent cores, is increased, the transmission distance or hopping is reduced. Wavelength resources for a large number of optical paths tend to be depleted. In order to receive a large number of communication setting requests for the entire network, it is better to use resources so as to leave the core wavelength resources with good transmission quality as much as possible.

  In the resource use situation of FIG. 16, next, the communication setting request (the optical path setting request from the first node (N1) to the eighth node (N8)) of the communication setting request C-19 of FIG. There is no available free resource that satisfies the continuity constraint and the spatial multipath constraint, and the communication setting request cannot be received. As described above, the fact that a wavelength is not allocated on the shortest communication path is a major problem in aiming for effective and efficient use of an optical frequency resource for economicalization of an optical communication network.

  In the RSSA system in which a plurality of propagation modes are used as the transmission line optical fiber of the SDM network, and a plurality of cores and the degree of freedom of space of the plurality of propagation modes are utilized, the influence of core-to-core or inter-mode crosstalk or the like may cause a problem. In the case of a network configuration in which the transmission quality differs for each mode, there is a similar problem. That is, there is a problem that the conventional resource allocation device cannot improve the use efficiency of the optical frequency resource.

  In view of the above circumstances, an object of the present invention is to provide a resource allocating method and a resource allocating device that can improve the use efficiency of optical frequency resources.

One aspect of the present invention configures a communication path in which an optical signal to be allocated to an optical signal from a start optical node to an end optical node in an optical network in which optical nodes are connected by a link is transmitted with the optical signal. A spatial multiplexing path used by the link, and a resource allocation method executed by a resource allocating apparatus that allocates a frequency width used in the spatial multiplexing path, wherein the spatial multiplexing path included in the link in the optical network is Based on the quality of the optical signal transmission of the spatial multiplexing path, the transmission distance, or a classification step of determining a classification according to the number of hops that can be transmitted between optical nodes, and the transmission distance or the number of hops in the communication path, , on the basis of the said classification and the spatial multiplexing paths determined in said classification step in the links forming the communication path, the communication Said link the spatial multipath available end-to-end from the optical node to the optical node of the end point of the start point 1 or more in constituting the path, spatial multiplexing channel allocation to be allocated to the optical signal of the resource assignment target steps and resource allocation from among the spatial multiplexing channel assignment common optical frequency resources available in the end-to-end from the optical node of the starting point in the spatial multiplexing path to said optical node endpoints assigned in step Assigning a frequency width to the optical signal.

One aspect of the present invention is a resource allocation method described above, wherein in the spatial multiplexing channel allocation step, the resource allocation target of the optical signal transmission distance or hops number shorter communication path, a shorter transmission The spatial multiplexing of the classification according to the possible distance or the number of hops that can be transmitted is preferentially assigned, and the longer transmission distance or the hop that can be transmitted is assigned to the optical signal to be allocated to the resource of the communication path having the longer transmission distance or hop number The spatial multiplexing paths classified according to the number are preferentially assigned.

One aspect of the present invention is a resource allocation method described above, in the classification step, the spatial multiplexing path is classified into N, i of when the corresponding transmittable distance or the transmittable number of hops to the arranged in ascending order When the i-th (i is an integer of 1 or more and N or less) class is class i, in the spatial multipath assignment step, the transmittable distance or the transmission distance or hop number of the communication path corresponds to class i. When the number of hops is equal to or less than the number of possible hops, the spatial multiplexing path of the class i is assigned to the optical signal to be resource-allocated, and the transmission distance or hop number of the communication path corresponds to the classification i. And the transmission distance or the number of hops corresponding to the classification (i + 1) is equal to or less than the number of hops, the optical signal to be assigned a resource is classified into the spatial multiplexing of the classification (i + 1). When the transmission distance or the hop number of the communication path is equal to or less than the transmittable distance or the transmittable hop number corresponding to the class (N-1), the space of the class N is assigned to the optical signal to be resource-allocated. Assign multipath.

  One aspect of the present invention is the above-described resource allocation method, wherein in the spatial multiplexing channel allocating step, the light to be resource-allocated is assigned to the spatial multiplexing channel of the class j (j is an integer of 1 or more and N-1 or less). If there is no frequency width resource capable of accommodating a signal, the value of j is sequentially increased until the spatial multiplexing path having a frequency resource width capable of accommodating the optical signal of the resource allocation target is detected. A spatial multiplexing path is allocated to the optical signal to be allocated a resource.

  One aspect of the present invention is the resource allocation method described above, wherein in the spatial multipath allocating step, the transmission distance or the number of hops in the communication path is the transmission distance or the number of hops that can be transmitted corresponding to all the classifications. If it exceeds, it notifies that the communication path of the optical signal to be resource-allocated cannot be set or that the optical signal needs to be regenerated and relayed at an arbitrary point on the communication path.

One aspect of the present invention configures a communication path in which an optical signal to be allocated to an optical signal from a start optical node to an end optical node in an optical network in which optical nodes are connected by a link is transmitted with the optical signal. A spatial multiplexing path used in the link, and a resource allocating device that allocates a frequency width used in the spatial multiplexing path, wherein the spatial multiplexing path included in the link in the optical network, Based on the quality of the optical signal transmission, the transmittable distance, or a classification unit that determines a classification according to the number of transmittable hops between optical nodes, the transmission distance or the number of hops in the communication path, and the communication path starting at said link wherein, based on the classification and said classification unit for spatial multiplexing path is determined in the link, forming the communication path to The optical node can be used in the end-to-end to the optical nodes of the end point from a said spatially multiplexed channel one or more, and a spatial multiplexing channel allocation unit for allocating to the optical signal of the resource allocation target, the spatial multiplexing channel allocation unit Allocates a frequency width to the optical signal to be resource-allocated from common optical frequency resources available end-to-end from the optical node at the start point to the optical node at the end point in the spatial multiplexing channel allocated by A frequency allocating unit.

  According to the present invention, it is possible to improve the use efficiency of optical frequency resources.

FIG. 1 is a diagram illustrating a configuration of a network management device according to a first embodiment of the present invention. It is a figure showing the example of the spatial multipath classification by the spatial multipath classification calculation part in the embodiment. FIG. 3 is a diagram illustrating an example of a physical model of a network and an example of a spatial multipath applied to the embodiment. FIG. 3 is a diagram illustrating an example of a resource use situation in the embodiment. It is a figure showing the composition of the available resource search part in the embodiment. FIG. 3 is a diagram illustrating a configuration of a resource assignment unit according to the first embodiment. FIG. 3 is a diagram illustrating an example of a resource use situation in the embodiment. FIG. 3 is a diagram illustrating an example of a final resource use situation in the embodiment. It is a figure showing the composition of the available resource search part in a 2nd embodiment. FIG. 3 is a diagram illustrating a configuration of a resource assignment unit according to the first embodiment. FIG. 2 is a diagram illustrating a general RSSA scheme. It is a figure which shows the example of a network model and the example of a spatial multiplexing path by the conventional RSSA system. It is a figure showing the core number given to MCF. It is a figure showing the example of a communication setting request. FIG. 11 is a diagram illustrating an example of assignment of a communication path, a spatial multiplexing path, and a wavelength according to a conventional RSSA method. FIG. 11 is a diagram illustrating an example of assignment of a communication path, a spatial multiplexing path, and a wavelength according to a conventional RSSA method.

An embodiment of the present invention will be described in detail with reference to the drawings.
Hereinafter, a network management device connected to a photonic network including an optical node that performs optical demultiplexing and optical amplification without electrically terminating an optical signal and an optical fiber that is an optical transmission medium will be described. The network management device communicates based on the RWA method, the RSA method, or the RSSA method. Hereinafter, as an example, the network management device performs communication based on the RSSA method.

(First embodiment)
FIG. 1 is a diagram illustrating an example of the configuration of the network management device 100. The network management device 100 (resource allocation device) includes a spatial multipath classification calculation unit 101, a spatial multipath classification calculation result storage unit 102, a communication path search unit 103, a communication path calculation result storage unit 104, an available resource A search unit 105, an available resource calculation result storage unit 106, a resource allocation unit 107, a communication path / resource allocation result storage unit 108, a communication path / resource selection unit 109, and a selection result storage unit 110 are provided.

  Some or all of the spatial multiplexing path classification calculating unit 101, the communication path searching unit 103, the available resource searching unit 105, the resource allocating unit 107, and the communication path / resource selecting unit 109 include, for example, a CPU ( A processor such as a central processing unit is a software function unit that functions by executing a program stored in the storage unit. Some or all of these functional units may be hardware functional units such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), and an FPGA (Field-Programmable Gate Array).

  The spatial multiplex path classification calculation result storage unit 102, the communication path calculation result storage unit 104, the available resource calculation result storage unit 106, the communication path / resource allocation result storage unit 108, and the selection result storage unit 110 include a magnetic hard disk device and a semiconductor storage device. It is configured using a storage device having a non-volatile storage medium (non-temporary recording medium) such as a device. The spatial multipath classification calculation result storage unit 102, the communication path calculation result storage unit 104, the available resource calculation result storage unit 106, the communication path / resource allocation result storage unit 108, and the selection result storage unit 110 are, for example, RAM (Random Access). Memory) or a volatile storage medium such as a register.

  The spatial multiplexing path classification calculation unit 101 performs transmission distance or transmission between optical nodes based on an optical signal quality such as an optical transmission method of the spatial multiplexing path, chromatic dispersion, nonlinear optical effect, optical waveform deterioration caused by crosstalk, and the like. Spatial multiplexing is classified according to the number of possible hops. Here, the spatial multiplexing path classification calculation unit 101 assigns a number according to a transmittable distance of an optical path according to crosstalk characteristics between spatial multiplexing paths (between cores or between propagation modes) in the SDM network or the number of hops equivalent thereto. And classify the spatial multipath. FIG. 2 is a diagram showing an example of spatial multipath classification when a three-core MCF is assumed to be a transmission line optical fiber of an SDM network. In the figure, three cores (spatial multipaths) having core numbers 1, 2, and 3 are classified into a spatial multipath classification of core classification 1 or core classification 2 (hereinafter, also simply referred to as “classification”). . The details of the classification of the spatial multiplexing path will be described later. Next, the spatial multiplexing path classification calculation unit 101 stores the spatial multiplexing path classification result in the spatial multiplexing path classification calculation result storage unit 102.

  The communication path search unit 103 calculates a communication path between points in an optical network in which optical nodes are connected by a link by a path search based on a shortest path (Shortest Path) algorithm (Fewest-hop method, Shortest Distance method, or the like). The communication route search unit 103 calculates a communication route based on the communication setting request and the spatial multipath classification from the spatial multipath classification calculation result storage unit 102. The communication route search unit 103 stores the calculation result of the communication route in the communication route calculation result storage unit 104. Further, the communication route search unit 103 notifies the available resource search unit 105 of the calculation result of the communication route. The communication route calculation result storage unit 104 stores the communication route calculation result of the communication route search unit 103.

  The available resource search unit 105 searches for available resources based on the RSSA method. The available resource search unit 105 acquires the calculation result of the communication route from the communication route calculation result storage unit 104 based on the information notified from the communication route search unit 103, and applies the spatial multiplexing path constraint and the wavelength to the obtained calculation result. Calculate available resources that satisfy the continuity constraint. The available resource search unit 105 stores the calculation result of the available resource in the available resource calculation result storage unit 106, and notifies the resource allocation unit 107 of the calculation result. The available resource calculation result storage unit 106 stores the results of calculation of a set of candidates for a communication path, a candidate for a spatial multiplexing path, and a candidate for a wavelength (hereinafter, referred to as a “candidate set”) by the available resource search unit 105.

  Based on the RSSA method, the resource allocating unit 107 executes the Space-FF method or the like for the spatial multiplexing path allocation, and executes the λ-FF method or the LF method for the wavelength allocation. The resource allocation unit 107 acquires a candidate set from the available resource calculation result storage unit 106 based on the information notified from the available resource search unit 105, and assigns a spatial multiplexing path, a wavelength, and the like to the acquired candidate set. calculate. The resource allocating unit 107 stores the calculated allocation result in the communication path / resource allocation result storage unit 108, and notifies the communication path / resource selecting unit 109 of the result of the allocation. The communication path / resource allocation result storage unit 108 stores the calculation result of the candidate set by the resource allocation unit 107.

  The communication path / resource selection unit 109 obtains a candidate group calculation result from the communication path / resource allocation result storage unit 108 based on the information notified from the resource allocation unit 107. The communication path / resource selection unit 109 selects a final candidate set when a plurality of candidate sets exist. The communication path / resource selection unit 109 stores the selection result in the selection result storage unit 110. The selection result storage unit 110 stores candidate sets that are being selected by the communication path / resource selection unit 109. Further, the selection result storage unit 110 stores the candidate set that is the final selection result by the communication path / resource selection unit 109.

  FIG. 3 is a diagram illustrating an example of a physical model of a network applied to the present embodiment. The physical model shown in the figure is a 3 × 3 lattice network including a first node (N1) to a ninth node (N9). The optical fiber of each link between nodes constituting the network is an MCF having three cores as shown in FIG. The spatial multiplexing path of core number 2 shown in FIG. 2 is strongly affected mainly by the crosstalk between cores from the spatial multiplexing paths of core numbers 1 and 3, while spatial multiplexing of core number 1 and core number 3 is strong. The path is strongly affected mainly by crosstalk between cores from the spatial multiplexing path of core number 2. Therefore, the spatial multiplexing paths of core numbers 1 and 3 are superior to the spatial multiplexing path of core number 2 in terms of transmission quality. In view of such transmission quality for each spatial multiplexing channel, core number 2 is categorized into core class 1 and core numbers 1 and 3 are categorized into core class 2 by spatial multiplexing channel classification calculating section 101. The upper limit of the number of usable wavelengths of each optical fiber core is four. FIG. 4 is a diagram illustrating an example of correspondence between a link number, a core number, a core classification, and a wavelength number in a state where communication paths and resources are set in the network of FIG. 3 based on a plurality of communication setting requests. It is.

  FIG. 5 is a diagram illustrating an example of a configuration of the available resource search unit 105. The available resource search unit 105 includes a spatial multiplexing constraint calculation unit 151, a spatial multiplexing constraint calculation result storage unit 152, a wavelength continuity constraint calculation unit 153, and a wavelength continuity constraint calculation result storage unit 154.

  The spatial multiplexing path constraint calculating unit 151 calculates a spatial multiplexing path in which an optical path can be set. The spatial multipath constraint calculating unit 151 is provided from the communication route candidates obtained from the communication route calculation result storage unit 104 according to the transmission distance of the optical path start / end node in response to the communication setting request or the number of hops equivalent thereto. According to the classified spatial multipath classification, a spatial multipath capable of setting an optical path is calculated. The spatial multipath constraint calculating unit 151 stores the calculation result in the spatial multipath constraint calculation result storage unit 152, and notifies the calculation result to the wavelength continuity constraint calculating unit 153. The spatial multipath constraint calculation result storage unit 152 stores route candidates that satisfy the spatial multipath constraint.

  The wavelength continuity constraint calculation unit 153 obtains, from the space multipath constraint calculation result storage unit 152, a calculation result of a communication path satisfying the space multipath constraint, based on the information notified from the space multipath constraint calculation unit 151, and obtains the calculation result. An available resource satisfying the wavelength continuity constraint is calculated based on the calculated result. The wavelength continuity constraint calculation unit 153 stores the calculation result of the available resource in the wavelength continuity constraint calculation result storage unit 154, and notifies the resource allocation unit 107 of the calculation result. The wavelength continuity constraint calculation result storage unit 154 stores route candidates that satisfy the wavelength continuity constraint. As described above, the available resource search unit 105 calculates a candidate set.

  As a configuration example of the available resource search unit 105, processing was performed in the order of the spatial multiplexing constraint calculation unit 151 and the wavelength continuity constraint calculation unit 153. However, processing was performed in the order of the wavelength continuity constraint calculation unit 153 and the spatial multiplexing constraint calculation unit 151. Is also good. In general, the number of candidates for the spatial multiplexing path is about 20, and the number of wavelength candidates is about 80, which is larger than the number of wavelength candidates. Should be calculated first to narrow down the number of route candidates.

  FIG. 6 is a diagram illustrating an example of the configuration of the resource allocation unit 107. The resource allocating unit 107 includes a spatial multiplexing channel classification selecting unit 171, a spatial multiplexing channel classification selection result storage unit 172, a wavelength / core allocation unit 173, and a wavelength / core allocation result storage unit 174.

  The spatial multiplexing path classification selecting unit 171 selects an optimal spatial multiplexing path for the transmission distance of the start / end node of the optical path or the number of hops equivalent thereto. In the network shown in FIG. 3, when the transmission characteristics due to the influence of crosstalk between cores and the like in the entire network are considered, the number of hops is 1, 2, 3, and 4 for the cores of core classification 2 (core numbers 1 and 3). Can be set, and an optical path having a transmission distance corresponding to hop numbers 1 and 2 can be set for a core of core classification 1 (core number 2). In order to receive a large number of communication setting requests for the entire network, it is better to use resources so as to leave wavelength resources of cores having good transmission characteristics as much as possible. In the core 2, the optical paths having the transmission distances corresponding to the hop numbers 3 and 4 are preferentially set, and the optical paths having the transmission distances corresponding to the hop numbers 1 and 2 are preferentially set to the core classification 1. Only when the optical path for the communication setting request of the transmission distance corresponding to the hop numbers 1 and 2 can no longer be accommodated on the spatial multiplex path No. 1 is changed to the spatial multiplex path of the core classification 2 to the hop numbers 1 and 2. The allocation method used for the optical path of the corresponding transmission distance is applied. The spatial multiplexing path classification selecting unit 171 selects a spatial multiplexing path classification according to the resource allocation method of the present embodiment from the candidate sets acquired from the available resource calculation result storage unit 106. The spatial multiplexing classification selecting unit 171 stores the selection result in the spatial multiplexing classification selection result storage unit 172, and notifies the wavelength / core allocating unit 173 of the selection result. The spatial multipath classification selection result storage unit 172 stores the selected candidate set.

  The wavelength / core allocating unit 173 acquires the selection result of the candidate set according to the spatial multiplexing classification allocation method from the spatial multiplexing classification selection result storage unit 172 based on the information notified from the spatial multiplexing classification selecting unit 171. Then, for the obtained selection result, for example, the Space-FF method or the like is used for spatial multipath allocation, and the λ-FF method or the LF method is used for wavelength allocation. The wavelength / core assignment unit 173 calculates a candidate set according to the wavelength / core assignment, stores the assignment result in the wavelength / core assignment result storage unit 174, and notifies the communication route / resource selection unit 109 of the assignment result. The wavelength / core assignment result storage unit 174 stores candidate sets according to the wavelength / core assignment. As described above, the resource allocation search unit calculates the candidate set.

  Next, a resource allocation method according to the present embodiment will be described with reference to an example of a resource use situation in FIG. Here, for the sake of simplicity, in the network shown in FIG. 3, a communication setting request is made only on the route of link 1-link 2-link 3-link 4 from the first node (N1) to the ninth node (N9). An example in which is generated will be described.

  The communication route search unit 103 executes, for example, the Dijkstra method. There are a plurality of communication paths for the optical path from the first node (N1) to the eighth node (N8) which are the calculation results of the communication path search unit 103. It is assumed that the communication route candidate satisfying the continuity constraint is the shortest route communication route candidate 1 indicated by the dotted arrow.

  Consider a case where the communication setting request shown in FIG. 14 is generated from the resource usage status (wavelength usage status) in FIG. Here, the wavelength / core assignment unit 173 executes the resource assignment algorithm in the order of the Space-FF method and the λ-FF method. The communication setting request C-1 is an optical path setting via the link number 1 from the first node (N1) to the second node (N2), and the transmission distance corresponds to the number of hops 1. It is assigned to the resource of core number 2 and wavelength number 1. FIG. 7 is a diagram showing a resource use state when an optical path corresponding to a communication setting request from the communication setting request C-2 to the communication setting request C-14 is similarly set according to the resource allocation method of the present embodiment. .

  The next communication setting request C-15 is an optical path setting via the link number 4 from the eighth node (N8) to the ninth node (N9), and the transmission distance corresponds to one hop. Therefore, the resource is preferentially allocated to the free resource of the core category 1 (core number 2), but the free resource of the link 4 in the core category 2 is used because there is no free resource for which the communication setting request C-15 can be set. Is done. According to the order of the Space-FF method and the λ-FF method of the wavelength / core allocation algorithm, the communication setting request C-15 is allocated to the resource of the core classification 2, the core number 1, and the wavelength number 3. Similarly, since the transmission distances of the communication setting requests C-16 and C-17 correspond to the hop numbers 2 and 1, respectively, it is desired to preferentially arrange the free resources of the core classification 1 (core number 2). Therefore, an empty resource in the core classification 2 is set as a setting candidate. Further, similarly, when an optical path is set for the communication setting request after the communication setting request C-18, the communication setting request can be set by effectively utilizing the resources up to the communication setting request C-21. FIG. 8 is a diagram showing the resource use status at this time.

  As described above, the network management apparatus 100 preferentially assigns a spatial multiplexing path of a class having a shorter transmittable distance or a smaller number of hops to a path having a shorter transmittable distance or a smaller number of hops to be transmitted, A spatial multipath of a class having a longer transmittable distance or a longer transmittable hop number is preferentially assigned to an optical path having a longer hop number.

  Note that, for the communication setting request C-22, since there is no available resource accommodating the optical path, the network manager or the like is notified that setting is impossible. If the transmission distance or the number of hops of the optical path based on the communication setting request exceeds the transmittable distance or the number of transmittable hops of the spatial multipath classification, the optical path cannot be set, or the optical path is set. The network management apparatus 100 according to the first embodiment can also notify a network administrator or the like that the optical signal needs to be regenerated and relayed at an arbitrary point between the start and end points.

  As described above, the network management device 100 according to the first embodiment can improve the use efficiency of the optical frequency resources as compared with the conventional resource allocation based on the RSSA method. By using the resources so as to leave the wavelength resources of the core with good transmission quality as much as possible, it is possible to delay the timing when there is no wavelength available on a specific link and the communication setting request cannot be accepted.

  Further, the network management device 100 of the first embodiment suppresses the occurrence of a state in which a communication setting request cannot be set due to the number of used wavelengths of a link reaching an upper limit (maximum value) in a transparent optical path network. In addition, it is possible to optimize the use efficiency of the optical frequency resources.

  It should be noted that a network configuration using a fixed frequency band (wavelength), a network configuration using a variable frequency band (frequency width), and a wavelength division multiplex transmission (WDM) Even in a network in which the divided optical signals are further spatially multiplexed, the resource use efficiency is optimized.

  The network management device 100 according to the first embodiment includes an optical node having a function of performing optical demultiplexing and optical amplification without electrically terminating an optical signal for establishing communication, and an optical fiber serving as an optical transmission medium. In the configured photonic network, a communication path, a spatial multiplexing path, and a resource to be allocated on the communication path of an optical path connecting a start point and an end point of an optical signal for setting communication are selected.

  The network management device 100 according to the first embodiment sets a frequency width, for example, according to the ITU-T for the communication path calculation and the resource allocation of the optical path with the efficient optical path setting of the photonic network. Even in the case of a fixed frequency width (wavelength) or a variable frequency width, it is possible to improve the use efficiency of the optical frequency resources. The network management device 100 according to the first embodiment can improve resource use efficiency even in the case of a fixed or variable frequency width between spatially multiplexed optical fiber cores or modes. Become.

(Second embodiment)
The second embodiment is different from the first embodiment in that the available resource search unit selects an optimal spatial multiplexing path for the transmission distance of the start / end node of the optical path or the number of hops equivalent thereto. I do. In the second embodiment, only differences from the first embodiment will be described. The network management device 100 according to the present embodiment replaces the available resource search unit 105 and the resource allocation unit 107 in the first embodiment with an available resource search unit 105a illustrated in FIG. 9 and a resource allocation unit 107a illustrated in FIG. It is a configuration provided with.

  FIG. 9 is a diagram illustrating an example of a configuration of the available resource search unit 105a. The available resource searching unit 105a includes a spatial multiplexing path constraint calculation unit 251, a spatial multiplexing path constraint calculation result storage unit 252, a spatial multiplexing path classification selection unit 253, a spatial multiplexing path classification selection result storage unit 254, A constraint calculation unit 255 and a wavelength continuity constraint calculation result storage unit 256 are provided.

  The spatial multipath constraint calculating unit 251, like the spatial multipath constraint calculating unit 151 of the first embodiment, selects an optical path for the communication setting request from the communication route candidates acquired from the communication route calculation result storage unit 104. In accordance with the spatial multiplexing path classification given according to the transmission distance of the start / end node or the number of hops equivalent thereto, a spatial multiplexing path for which an optical path can be set is calculated. The spatial multipath constraint calculating unit 151 stores the calculation result in the spatial multipath constraint calculation result storage unit 252 and notifies the spatial multipath classification selecting unit 253 of the calculation result. The spatial multipath constraint calculation result storage unit 252 stores route candidates that satisfy the spatial multipath constraint.

  The spatial multiplexing path classification selecting unit 253 selects an optimal spatial multiplexing path for the transmission distance of the start / end node of the optical path or the number of hops equivalent thereto, similarly to the spatial multiplexing path classification selecting unit 171 of the first embodiment. I do. In the case of the network illustrated in FIG. 3, the spatial multipath classification selecting unit 253 preferentially gives an optical path having a transmission distance corresponding to the number of hops 3 and 4 to the core of the core classification 2 similarly to the first embodiment. , And an allocation method of preferentially setting a core of core classification 1 to an optical path having a transmission distance corresponding to the hop numbers 1 and 2 is applied. The spatial multiplexing path classification selecting unit 253 selects a spatial multiplexing path classification according to the resource allocation method of the present embodiment from the candidate sets acquired from the spatial multiplexing path constraint calculation result storage unit 252. The spatial multiplexing path classification selecting unit 253 stores the selection result in the spatial multiplexing path classification selection result storage unit 254, and notifies the selection result to the wavelength continuity constraint calculating unit 255. The spatial multipath classification selection result storage unit 254 stores the selected candidate set.

  The wavelength continuity constraint calculation unit 255 acquires the candidate set selected from the spatial multipath classification selection result storage unit 254 based on the information notified from the spatial multipath classification selection unit 253, and assigns a wavelength to the acquired candidate set. An available resource satisfying the continuity constraint is calculated, the calculation result is stored in the wavelength continuity constraint calculation result storage unit 256, and the calculation result is notified to the resource allocation unit 107a. The wavelength continuity constraint calculation result storage unit 256 stores route candidates that satisfy the wavelength continuity constraint.

  If there is no selected candidate set that satisfies the wavelength continuity constraint in the wavelength continuity constraint calculation unit 255, that is, a communication setting request for a transmission distance corresponding to the hop counts 1 and 2 on the spatial multiplexing path of the core classification 1. If the optical path cannot be accommodated, the spatial multipath classification selecting unit 253 is notified that there is no candidate set. The spatial multiplexing path classification selecting unit 253 applies an allocation method of setting an optical path of a transmission distance corresponding to the number of hops 1 and 2 to the spatial multiplexing path of the core classification 2, and again stores the spatial multiplexing path constraint calculation result storage unit 252. From the candidate sets obtained from the above, a spatial multipath classification according to the resource allocation method of the present embodiment is selected. Thereafter, similarly to the above, the spatial multipath classification selecting unit 253 stores the selection result in the spatial multipath classification selection result storage unit 254, notifies the selection result to the wavelength continuity constraint calculating unit 255, and executes the spatial multipath classification selection. The result storage unit 254 stores the selected candidate set. The wavelength continuity constraint calculation unit 255 acquires the candidate set selected from the spatial multipath classification selection result storage unit 254 based on the information notified from the spatial multipath classification selection unit 253, and assigns a wavelength to the acquired candidate set. Calculate available resources that satisfy the continuity constraint. The wavelength continuity constraint calculation unit 255 stores the calculation result in the wavelength continuity constraint calculation result storage unit 256, and notifies the resource allocation unit 107a of the calculation result. Stores candidates. As described above, the available resource search unit 105a calculates a candidate set.

  As an example of the configuration of the available resource search unit 105a, the spatial multipath constraint calculation unit 251, the spatial multipath classification selection unit 253, and the wavelength continuity constraint calculation unit 255 are processed in this order. The processing may be performed in the order of the calculation unit 251 and the spatial multipath classification selection unit 253. As in the first embodiment, in order to reduce the calculation amount of the entire processing, it is better to calculate the spatial multipath constraint first and narrow the number of route candidates.

  FIG. 10 is a diagram illustrating an example of the configuration of the resource allocation unit 107a. The resource allocating unit 107a includes a wavelength / core allocation unit 271 and a wavelength / core allocation result storage unit 272.

  The wavelength / core allocating unit 271 acquires the selection result of the candidate set according to the resource allocation method of the present embodiment from the available resource calculation result storage unit 106 based on the information notified from the available resource searching unit 105a. For the obtained selection result, for example, the Space-FF method or the like is used for spatial multipath assignment, and the λ-FF method or the LF method is used for wavelength assignment. The wavelength / core assignment unit 271 calculates a candidate set according to the wavelength / core assignment, stores the assignment result in the wavelength / core assignment result storage unit 272, and notifies the communication route / resource selection unit 109 of the assignment result. The wavelength / core assignment result storage unit 272 stores candidate sets according to the wavelength / core assignment. As described above, the resource allocation search unit calculates the candidate set.

  By applying the resource allocation method of the second embodiment, it is possible to improve the resource use efficiency, as in the first embodiment.

  In the above description, the case where the spatial multiplexing path is classified into two has been described as an example. However, when the number of classifications is N (N is an integer of 2 or more), the resource allocating unit 107 and the The process of allocating a spatial multiplexing channel in the resource allocating unit 107a of the second embodiment can be generalized as follows. .., N in order from the one with the smallest transmittable distance or the number of transmittable hops. The resource allocating units 107 and 107a determine that the transmission distance or the number of hops of the optical path set based on the communication request is equal to or less than the transmission distance or the number of hops corresponding to the classification i (i is an integer of 1 or more and N or less). , A spatial multiplexing path of classification i is assigned to the optical path. When the transmission distance or the number of hops of the optical path set based on the communication request exceeds the transmission distance or the number of hops corresponding to the class i and is equal to or less than the transmission distance or the number of hops of the class (i + 1). Then, the resource allocating units 107 and 107a allocate the classification (i + 1) spatial multiplexing path to the optical path. Further, when the transmission distance or the number of hops of the optical path set based on the communication request is equal to or less than the transmission possible distance or the transmission possible hop number corresponding to the class (N-1), the resource allocation units 107 and 107a use the optical path. A spatial multiplexing path of classification (N) is assigned to the path. Further, the resource allocating units 107 and 107a assign the optical path to a spatial multiplexing path of a class j (j is an integer of 1 or more and (N-1) or less) corresponding to the transmittable distance or the transmittable hop number of the optical path. When there is no more frequency bandwidth resource that can accommodate the optical signal to be transmitted, a spatial multiplexing path of classification (j + 1) is assigned to the optical path. If the spatial multiplexing path of the classification (j + 1) does not have a frequency width resource capable of accommodating the optical signal transmitted through the optical path, the resource allocating units 107 and 107a sequentially perform the classification (j + 2) and the subsequent. A spatial multiplex path having an accommodable frequency resource width is allocated.

  According to the above-described embodiment, the resource allocation device provides the resource allocation target optical signal with a spatial multiplexing path used in a link configuring a communication path through which the resource allocation target optical signal is transmitted, and a spatial multiplexing path used in the spatial multiplexing path. Frequency width to be assigned. The resource allocation target optical signal is an optical signal from a start optical node to an end optical node set by a communication request between points in a network in which the optical nodes are connected by a link. The resource assignment device includes a classification unit, a spatial multiplexing channel assignment unit, and a frequency assignment unit. For example, the resource allocating device is the network management device 100, the classifying unit is the spatial multiplexing channel classification calculating unit 101, and the spatial multiplexing channel allocating unit and the frequency allocating unit are the resource allocating units 107 and 107a.

  The classifying unit transmits a signal to the spatial multiplexing path included in the link in the network based on the optical signal transmission quality of the spatial multiplexing path, such as chromatic dispersion, nonlinear optical effect, and optical waveform deterioration caused by crosstalk. A classification is determined according to the possible distance or the number of hops that can be transmitted between optical nodes. The spatial multiplexing path allocating unit configures the communication path based on the transmission distance or the number of hops in the communication path of the resource allocation target optical signal and the classification determined for the spatial multiplexing path in the link configuring the communication path. One or more spatial multiplexing paths used in the link are allocated to the resource allocation target optical signal. For example, the spatial multiplexing path allocating unit preferentially assigns a spatial multiplexing path of a classification according to a shorter transmittable distance or a transmittable hop number to a resource allocation target optical signal of a communication path having a shorter transmittable or transmission hop number. A spatial multiplexing path classified according to a longer transmittable distance or transmittable hop number is preferentially allocated to a resource allocation target optical signal of a communication path having a longer allocation, transmission distance, or hop number. The frequency allocating unit allocates the frequency width to the resource allocation target optical signal from the available frequency widths in the spatial multiplexing channel allocated by the spatial multiplexing channel allocating unit.

  The spatial multiplexing path allocating unit determines that the number of classifications of the spatial multiplexing path is N, and the ith (i is an integer of 1 or more and N or less) classification when the transmission possible distance or the number of transmittable hops is arranged in ascending order. When the transmission distance or the number of hops of the communication path is equal to or less than the transmittable distance or the number of transmittable hops corresponding to the class i, the spatial multiplexing path of the class i is allocated to the resource allocation target optical signal. , When the transmission distance or the number of hops of the communication path exceeds the transmittable distance or the number of hops corresponding to the category i and is equal to or less than the transmittable distance or the number of hops corresponding to the category (i + 1), A spatial multiplexing path of classification (i + 1) is allocated to the resource allocation target optical signal. Further, the spatial multiplexing path allocating unit, when the transmission distance or the number of hops of the communication path is equal to or less than the transmittable distance or the number of transmittable hops corresponding to the class (N-1), assigns the class N to the resource allocation target optical signal. Assign spatial multiplexing.

  Further, the spatial multiplexing path allocating unit, when there is no frequency width resource capable of accommodating the resource allocating target optical signal in the spatial multiplexing path of the class j (j is an integer of 1 or more and N-1 or less), The value of j may be sequentially increased until a spatial multiplexing path having an accommodable frequency resource width is detected, and the detected spatial multiplexing path may be allocated to the resource allocation target optical signal.

  Further, the spatial multiplexing path allocating unit, when the transmission distance or the number of hops in the communication path exceeds the transmittable distance or the number of hops corresponding to all classifications, the communication path of the resource allocation target optical signal can not be set, Alternatively, it may be notified that the optical signal needs to be regenerated and relayed at an arbitrary point on the communication path.

  At least a part of the network management apparatus 100 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read and executed by a computer system. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in a computer system. Further, a "computer-readable recording medium" refers to a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short time. Such a program may include a program that holds a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client in that case. The program may be for realizing a part of the functions described above, or may be a program that can realize the functions described above in combination with a program already recorded in a computer system. It may be realized using a programmable logic device such as an FPGA (Field Programmable Gate Array).

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments and includes a design and the like within a range not departing from the gist of the present invention.

100: Network management device, 101: Spatial multipath classification calculation unit, 102: Spatial multipath classification calculation result storage unit, 103: Communication path search unit, 104: Communication path calculation result storage unit, 105: Available resource search unit, 105a available resource search unit 106 available resource calculation result storage unit 107 resource allocation unit 107a resource allocation unit 108 communication path / resource allocation result storage unit 109 communication path / resource selection unit 110: Selection result storage unit, 151: Spatial multipath constraint calculation unit, 152: Spatial multipath constraint calculation result storage unit, 153: Wavelength continuity constraint calculation unit, 154: Wavelength continuity constraint calculation result storage unit, 171: Spatial multipath Classification selection unit, 172: Spatial multipath classification selection result storage unit, 173: Wavelength / core allocation unit, 17 4, wavelength / core allocation result storage unit, 251, spatial multipath constraint calculation unit, 252, spatial multipath constraint calculation result storage unit, 253, spatial multipath classification selection unit, 254, spatial multipath classification selection result storage unit, 255: wavelength continuity constraint calculation unit, 256: wavelength continuity constraint calculation result storage unit, 271: wavelength / core assignment unit, 272: wavelength / core assignment result storage unit

Claims (6)

Spatial multiplexing used in the link constituting a communication path for transmitting the optical signal to an optical signal to be allocated resources from the optical node at the start point to the optical node at the end point in an optical network in which optical nodes are connected by a link And a resource allocation method executed by a resource allocation device that allocates a frequency width used in the spatial multiplexing path,
For a spatial multiplexing path included in the link in the optical network, a transmission distance or a classification according to the number of hops that can be transmitted between optical nodes is determined based on the quality of the optical signal transmission of the spatial multiplexing path. Classification step
A transmission distance or number of hops in said communication path, on the basis of the said classification determined by the classification step for the spatial multiplexing channel in the links forming a communication path, the starting point in the links forming the communication path One or more spatial multiplexing paths available end-to-end from the optical node to the end point optical node , allocating a spatial multiplexing path to the optical signal for resource allocation,
In the spatial multiplexing path allocated in the spatial multiplexing path allocating step , from among the common optical frequency resources available end-to-end from the starting optical node to the ending optical node, A frequency allocation step of allocating a frequency width to the signal;
A resource allocation method comprising: Wherein in the spatial multiplexing channel allocation step, the resource allocation target of the optical signal transmission distance or hops number shorter communication route, wherein the spatial multiplexing channel classification corresponding to a shorter transmission distance or transmission possible number of hops Priority, the transmission distance or the number of hops to the optical signal of the resource allocation target of the longer communication path, preferentially allocate the spatial multiplexing of the classification according to the longer transmission distance or transmission hop number,
The resource allocation method according to claim 1, wherein: In the classification step, the spatial multiplexing path is classified into N, i-th when the corresponding transmittable distance or the transmittable number of hops to the arranged in ascending order (i is 1 or more N an integer) classifying the classification of When i is
In the spatial multipath assignment step,
When the transmission distance or the number of hops of the communication path is equal to or less than the transmittable distance or the transmittable hop number corresponding to the class i, the spatial multiplexing path of the class i is allocated to the optical signal to be resource-allocated,
When the transmission distance or the number of hops of the communication path exceeds the transmission distance or the number of hops corresponding to the category i and is equal to or less than the transmission distance or the number of hops corresponding to the category (i + 1), Assigning the spatial multiplexing path of classification (i + 1) to the optical signal to be assigned;
When the transmission distance or the number of hops of the communication path is equal to or less than the transmission possible distance or the transmission possible hop number corresponding to the class (N-1), the spatial multiplexing path of the class N is allocated to the optical signal to be allocated. ,
The resource allocation method according to claim 1 or 2, wherein: In the spatial multipath assignment step,
If the spatial multiplexing path of the classification j (j is an integer of 1 or more and N-1 or less) does not have a frequency width resource capable of accommodating the optical signal of the resource allocation target, the frequency capable of accommodating the optical signal of the resource allocation target The value of j is sequentially increased until the spatial multiplexing path having the resource width is detected, and the detected spatial multiplexing path is allocated to the optical signal to be resource-allocated.
4. The resource allocation method according to claim 3, wherein: In the spatial multipath assignment step, when the transmission distance or the number of hops in the communication path exceeds the transmittable distance or the number of transmittable hops corresponding to all the classes, the communication path of the optical signal to be resource-allocated is set. Notify that it is not possible, or that it is necessary to regenerate and repeat the optical signal at any point in the communication path,
The resource allocation method according to any one of claims 1 to 4, wherein: Spatial multiplexing used in the link constituting a communication path for transmitting the optical signal to an optical signal to be allocated resources from the optical node at the start point to the optical node at the end point in an optical network in which optical nodes are connected by a link And a resource allocation device that allocates a frequency width used in the spatial multiplexing path,
For a spatial multiplexing path included in the link in the optical network, a transmission distance or a classification according to the number of hops that can be transmitted between optical nodes is determined based on the quality of the optical signal transmission of the spatial multiplexing path. A classification unit to
Based on the transmission distance or the number of hops in the communication path and the classification determined by the classification unit with respect to the spatial multiplexing path in the link configuring the communication path , the starting point of the link configuring the communication path A spatial multiplexing section allocating one or more spatial multiplexing paths available end-to-end from an optical node to the optical node at the end point to the optical signal to be resource-allocated;
In the spatial multiplexing path allocated by the spatial multiplexing path allocating section, the light to be resource-allocated from the common optical frequency resources that can be used end-to-end from the starting optical node to the ending optical node. A frequency allocating unit that allocates a frequency width to the signal;
A resource allocation apparatus comprising:

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