JPWO2013005414A1 - Optical network system, communication control apparatus, communication control method, and communication control program - Google Patents

Abstract

In a network in which a plurality of transceivers on a plurality of nodes to which a plurality of channels are respectively assigned communicate using a plurality of assigned channels, a channel control unit controls communication of the plurality of transceivers on the network. Based on the acquired network information, the network information receiving unit (202) that acquires network information including the channel information indicating the situation, the channel availability indicating the channel availability is calculated, and the calculated channel available A ranking table creation unit (204) that determines channel allocation order based on the degree, and a transceiver wavelength control unit (206) that tunes a standby relay terminal to the allocated channel based on the determined allocation order And comprising.

Description

  The present invention relates to an optical network system, a communication control device, a communication control method, and a communication control program, and in particular, an optical network system, a communication control device, a communication control method, and a communication that control communication based on network control information in a communication network. It relates to the control program.

  In the current optical network, the optical path is statically set. However, with future traffic increase, it is desired to dynamically set the optical path from the viewpoint of network resources to improve the efficiency of network resource utilization. Yes.

  When setting the assigned wavelength to the transceiver, the transceiver needs to be tuned to the assigned wavelength. An example of a wavelength division multiplexing optical transmission apparatus that tunes to such a dynamically assigned wavelength is described in Japanese Patent Application Laid-Open No. 2000-174730. Patent Document 1 describes that the wavelength division multiplexing optical transmission apparatus includes a wavelength allocation unit that dynamically allocates a wavelength in response to a connection setting request between nodes via a control channel. The control channel exchanges information for path setting by being inserted and separated at each node. Further, the transmitter tunes the wavelength based on the control signal. Also, when setting the path to each node, a wavelength that can ensure a certain transmission quality is held as a wavelength allocation table, and an appropriate wavelength is selected from unused wavelengths by referring to the table when setting the optical path. Wavelength allocation.

JP 2000-174730 A

  The technique described in Patent Document 1 described above has a problem in that provisioning at high speed is not considered in order to immediately service-in when an optical path is dynamically set.

  An object of the present invention is to provide an optical network system, a communication control device, a communication control method, and a communication control program that solve the above-described problem that high-speed provisioning cannot be performed.

The optical network system of the present invention
In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
Control means for controlling communication of the plurality of relay terminals on the network;
Information acquisition means for acquiring network information including channel information indicating the status of the channel from the control means;
Calculation means for calculating channel availability indicating availability of the channel based on the acquired network information;
A rank determining means for determining a channel allocation rank based on the calculated channel availability;
Tuning means for tuning a standby relay terminal to the allocated channel based on the determined allocation order.

The communication control apparatus of the present invention
In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
Obtaining means for obtaining network information including channel information indicating the status of the channel from a control device that controls communication of the plurality of relay terminals on the network;
Calculation means for calculating channel availability indicating availability of the channel based on the acquired network information;
A rank determining means for determining a channel allocation rank based on the calculated channel availability;
Tuning means for tuning a standby relay terminal to the allocated channel based on the determined allocation order.

The communication control method of the present invention includes:
In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
A communication control device that controls communication of the plurality of relay terminals on the node,
Obtaining network information including channel information indicating the status of the channel;
Based on the acquired network information, a channel availability indicating the availability of the channel is calculated,
Determining the channel allocation order based on the calculated channel availability;
The communication control method tunes a standby relay terminal to the allocated channel based on the determined allocation order.

The computer program of the present invention is:
In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
A computer that realizes a communication control device that controls communication of a plurality of the relay terminals on the node;
Obtaining network information including channel information indicating the status of the channel;
A procedure for calculating a channel availability indicating the availability of the channel based on the acquired network information;
A step of determining an allocation order of the channels based on the calculated channel availability;
A communication control program for causing a standby relay terminal to be tuned to the allocated channel based on the determined allocation order.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  The various components of the present invention do not necessarily have to be independent of each other. A plurality of components are formed as a single member, and a single component is formed of a plurality of members. It may be that a certain component is a part of another component, a part of a certain component overlaps with a part of another component, or the like.

  Moreover, although the several procedure is described in order in the method and computer program of this invention, the order of the description does not limit the order which performs a several procedure. For this reason, when the method and computer program of the present invention are implemented, the order of the plurality of procedures can be changed within a range that does not hinder the contents.

  Furthermore, the plurality of procedures of the method and the computer program of the present invention are not limited to being executed at different timings. For this reason, another procedure may occur during the execution of a certain procedure, or some or all of the execution timing of a certain procedure and the execution timing of another procedure may overlap.

  According to the present invention, an optical network system, a communication control device, a communication control method, and a communication control program that realize high-speed provisioning are provided.

  The above-described object and other objects, features, and advantages will become more apparent from the preferred embodiments described below and the accompanying drawings.

1 is a block diagram showing a network configuration of an optical network system according to an embodiment of the present invention. It is a block diagram which shows the structure of each node of the optical network system which concerns on embodiment of this invention. It is a functional block diagram which shows the structure of the transceiver control apparatus which comprises the communication control apparatus which concerns on embodiment of this invention. It is a flowchart which shows the process sequence of the transceiver control apparatus of this embodiment. It is a flowchart which shows the procedure of the ranking table preparation process of FIG. 4 which the transceiver control apparatus of this embodiment performs. It is a figure which shows the example of the node structure used as the control object of the transceiver control apparatus of this embodiment. FIG. 7 is a diagram for explaining an example of a ranking table created by the transceiver control device of the present embodiment in the node configuration of FIG. 6. 5 is a flowchart showing a tuning process procedure of FIG. 4 executed by the transceiver control apparatus of the present embodiment. It is a flowchart which shows the process sequence of the transceiver control apparatus which comprises the communication control apparatus which concerns on embodiment of this invention. FIG. 7 is a diagram for explaining an example of a ranking table created by the transceiver control device of the present embodiment in the node configuration of FIG. 6. It is a flowchart which shows the process sequence of the transceiver control apparatus which comprises the communication control apparatus which concerns on embodiment of this invention. It is a figure which shows the example of the node structure used as the control object of the transceiver control apparatus of this embodiment when performing the process sequence of FIG. It is a figure for demonstrating the example of the ranking table which the transceiver control apparatus of this embodiment produces at the node structure of FIG. It is a flowchart which shows the process sequence of the transceiver control apparatus which comprises the communication control apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the example of the ranking table which the transceiver control apparatus of this embodiment produces at the node structure of FIG. It is a figure which shows the example of a node structure used as the control object of the transceiver control apparatus which comprises the communication control apparatus which concerns on embodiment of this invention. It is a figure for demonstrating the example of the ranking table which a transceiver control apparatus produces at the time of the node structure of FIG. It is a figure for demonstrating the example of the ranking table which a transceiver control apparatus produces at the time of the node structure of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

(First embodiment)
FIG. 1 is a block diagram showing a network configuration of an optical network system 1 according to an embodiment of the present invention.
In the optical network system 1 of the present embodiment, a plurality of relay terminals (transceiver group 30) on a plurality of nodes 10 to which a plurality of channels are respectively assigned communicate with each other by using the assigned plurality of channels ( The domain 3) includes a control plane 100 that controls communication of a plurality of relay terminals (transceiver group 30) on the network (domain 3). The relay terminal according to the embodiment of the present invention includes, for example, a transceiver provided with a transmitter or a receiver, or a transponder. Hereinafter, it will be described as a transceiver.

In the present embodiment, the network of the optical network system 1 is a network in the domain 3, but is not limited to this. Different domains 3 may be included. When different domains 3 are included, network information of different domains 3 is acquired, and channels that can be used up to destinations of different domains are grasped.
As shown in FIG. 1, in the optical network system 1, a plurality of nodes 10 are included in the domain 3. Each node 10 is connected by an optical fiber cable to form a wavelength division multiplexing (WDM) link.

  The optical network system 1 according to the embodiment of the present invention is configured so that an optical path in the optical network can be dynamically set. The control plane 100 includes a network control device (not shown) that determines a channel (wavelength) to be allocated on an optical path when provisioning a new optical path. Here, the control plane 100 may be a server that holds network information in the domain 3. The control plane 100 may be composed of a plurality of servers. In the present invention, a channel can be represented by a frequency band having a frequency or bandwidth (range) of a wavelength allocated to each terminal within a communication band.

Each node 10 includes a transceiver control device 200.
In other words, each node 10 is realized by a computer such as the transceiver control device 200 according to the present embodiment, and a destination address is assigned on the domain 3 of the optical network system 1.

The transceiver control device 200 is connected to the control plane 100 via a network, and the transceiver control device 200 is connected to the transceiver group 30 on the node 10.
The connection between the transceiver control device 200 and the control plane 100 may be either wireless or wired. Furthermore, the connection between the transceiver controller 200 and the transceiver group 30 may be either wireless or wired.

  As will be described later, the transceiver control device 200 controls the transceiver group 30 on the node 10 in accordance with information from the control plane 100. In the optical network system 1 of the present embodiment, the plurality of transceivers included in the transceiver group 30 play the role of a transmitter in each node.

  In the present embodiment, the transceiver control device 200 is provided in each node 10 one by one. However, the present invention is not limited to this. One transceiver control device 200 may control the transceiver group 30 on the plurality of nodes 10, or the plurality of transceiver control devices 200 may share and control the transceiver group 30 on one node 10.

In the present embodiment, the transceivers included in the transceiver group 30 can take the following three operating states, for example.
(1) Active state: State in which communication is performed using the assigned channel (2) Standby state: Communication is not performed in the state tuned in the assigned channel, but data is immediately prepared for provisioning A state in which transmission is possible and a standby state (3) A hibernation state: a state in which power is turned off Here, a transceiver in a hibernation state and a standby state is a transceiver that is not regularly used.

  The transceiver control device 200 receives the network information 102 from the control plane 100 and creates a wavelength allocation ranking table to be described later, thereby performing tuning control 104 for the standby transceiver 34 in the transceiver group 30. The transceiver group 30 also includes an active transceiver 32 used for data transmission and a dormant transceiver (not shown). The configuration of the transceiver control device 200 will be described later.

FIG. 2 is a block diagram showing a configuration of each node of the optical network system according to the embodiment of the present invention.
As shown in FIG. 2, a plurality of transceivers (active transceiver 32 and standby transceiver 34) included in the transceiver group 30 are respectively connected to the transceiver aggregator 40. The transceiver aggregator 40 has a plurality of input ports 42 and a plurality of output ports 44. Each transceiver in the transceiver group 30 can transmit a signal at any wavelength to any output port 44 of the transceiver aggregator 40 via any input port 42 in accordance with control from the transceiver controller 200. The transceiver aggregator 40 is connected to the switch 50, and is output from the output port 44 of the transceiver aggregator 40. The optical signal input to the switch 50 is output to an arbitrary path.

  The switch 50 is, for example, an OXC / ROADM device (also referred to as an optical cross-connect device) that can switch, branch, or insert an optical signal, or an optical switch that constitutes an Add / Drop device. In the present invention, the configurations of the transceiver, the transceiver aggregator 40, and the switch 50 are not particularly limited, and are not related to the essence of the present invention, and thus detailed description thereof is omitted.

FIG. 3 is a functional block diagram showing a configuration of the transceiver control device constituting the communication control device according to the embodiment of the present invention.
In the optical network system 1 of the present embodiment, the transceiver control device 200 includes an information acquisition unit (network information reception unit 202) that acquires network information 102 (FIG. 1) including channel information indicating the channel status from the control plane 100. A calculation unit (ranking table creation unit 204) that calculates channel availability indicating channel availability based on the acquired network information 102, and a channel allocation order based on the calculated channel availability And a tuning unit (transceiver wavelength control unit 206) that tunes the standby relay terminal (standby transceiver 34) to the allocated channel based on the determined allocation order. And).

The transceiver control device 200 includes a CPU (Central Processing Unit), a memory, a program for realizing the components shown in the figure loaded in the memory, a storage unit such as a hard disk and a ROM (Read Only Memory) for storing the program, and a network connection. It may be realized by an arbitrary combination of hardware and software of an arbitrary computer including an interface for an application. It will be understood by those skilled in the art that there are various modifications to the implementation method and apparatus. Each figure described below shows a functional unit block, not a hardware unit configuration.
Further, in the following drawings, the configuration of parts not related to the essence of the present invention is omitted and is not shown.

  In the transceiver control device 200, the network information receiving unit 202 receives and acquires the network information 102 from the control plane 100 to each node 10 (FIG. 1) via the network. The ranking table creation unit 204 creates a wavelength allocation ranking table, which will be described later, based on the network information from the network information reception unit 202.

  The transceiver wavelength control unit 206 tunes the wavelength of the standby transceiver 34 in the standby state based on the created ranking table. The transceiver wavelength control unit 206 also performs control to switch the transceiver from the sleep state to the standby state, or from the standby state to the sleep state, depending on the situation.

  In the communication control program according to the embodiment of the present invention, a plurality of relay terminals (transceivers of the transceiver group 30 in FIGS. 1 to 3) on a plurality of nodes 10 (FIG. 1) to which a plurality of channels are respectively assigned are Communication control device (transceiver control device) for controlling communication of a plurality of relay terminals (transceivers of transceiver group 30) on node 10 in a network (domain 3 in FIG. 1) that uses each of a plurality of assigned channels for communication 200), the procedure for acquiring the network information 102 (FIG. 1) including the channel information indicating the channel status, and the channel availability indicating the channel availability based on the acquired network information 102. Channel allocation based on the procedure to calculate and the calculated channel availability It is described to execute a procedure for determining an order, and a procedure for tuning a standby relay terminal (standby transceiver 34 in FIGS. 1 to 3) to an assigned channel based on the determined assignment order. .

  The computer program of this embodiment may be recorded on a computer-readable recording medium. The recording medium is not particularly limited, and various forms can be considered. The program may be loaded from a recording medium into a computer memory, or downloaded to a computer through a network and loaded into the memory.

In the configuration as described above, a communication control method by the transceiver control apparatus 200 of the present embodiment will be described below. FIG. 4 is a flowchart showing a processing procedure of the transceiver control device 200 of the present embodiment. Hereinafter, description will be made with reference to FIGS.
In the communication control method according to the embodiment of the present invention, a plurality of relay terminals (transceivers of the transceiver group 30 in FIGS. 1 to 3) on a plurality of nodes 10 (FIG. 1) to which a plurality of channels are respectively assigned are In a network (domain 3 in FIG. 1) that communicates using each of a plurality of allocated channels, a communication control device (FIG. 1 to FIG. 1) that controls communication of a plurality of relay terminals (transceivers in the transceiver group 30) on the node 10 The transceiver control device 200 in FIG. 3 acquires the network information 102 (FIG. 1) including the channel information indicating the channel status (step S1101 in FIG. 4), and the channel can be used based on the acquired network information 102 Channel availability indicating the channel availability and channel allocation based on the calculated channel availability. The rank is determined (step S1102 in FIG. 4), and the standby relay terminal (the standby transceiver 34 of the transceiver group 30 in FIGS. 1 to 3) is tuned to the allocated channel based on the determined allocation order. (Step S1103 in FIG. 4).

A specific operation of the optical network system 1 of the present embodiment will be described below. Hereinafter, description will be made with reference to FIGS.
As shown in FIG. 4, first, the network information receiving unit 202 (FIG. 3) of the transceiver control device 200 receives the network information 102 (FIG. 1) from the control plane 100 (step S1101). Then, after receiving the network information 102, the ranking table creation unit 204 (FIG. 3) of the transceiver control device 200 creates a ranking table for assigning wavelengths to the transceivers (step S1102).
Then, after creating the ranking table, the transceiver wavelength control unit 206 (FIG. 3) of the transceiver control device 200 tunes the standby transceiver 34 based on the ranking table (step S1103).

FIG. 5 is a flowchart showing the procedure of the ranking table creation process executed by the transceiver control device 200 shown in step S1102 of FIG. The processing of FIG. 5 is performed by the ranking table creation unit 204 of the transceiver control device 200. Hereinafter, description will be made with reference to FIGS.
As shown in FIG. 5, in the transceiver control device 200, the ranking table creation unit 204 receives the network information 102 from the network information reception unit 202 (step S1201). Here, the received network information 102 includes route information to each node 10, usable wavelengths, the number of hops, a block rate, and the like. Note that the usable wavelength included in the network information 102 acquired by the transceiver control device 200 may be, for example, information on the wavelength currently in use. Then, the transceiver control apparatus 200 may obtain a free usable wavelength from the information on the wavelength in use included in the network information 102 in step S1202 described later.

  After receiving the network information 102, the ranking table creation unit 204 extracts the network information 102 necessary for creating the ranking table (step S1202). For example, based on the received path information of the network information 102, the destination information of each node 10 that is the destination from the node 10 controlled by the transceiver control device 200 is extracted, and the usable wavelengths are extracted for each destination. Based on the network information extracted here, a ranking creation table 210 (FIG. 7A) is created and temporarily stored in a storage unit (not shown).

  Next, the ranking table creation unit 204 calculates the availability of each wavelength from the ranking creation table 210 (step S1203). In the present embodiment, the availability level indicates the availability in provisioning of each wavelength.

  For example, the number of transmittable nodes for each wavelength is used as the availability level. After that, the ranking table creation unit 204 creates the wavelength ranking table 212 (FIG. 7B) in descending order of availability, and temporarily stores it in the storage unit (not shown) (step S1204). When the availability level is the number of transmittable nodes, the ranking table 212 is created in order of wavelengths with the largest number of transmittable nodes.

Hereinafter, based on the example of a node structure, the creation process of the ranking table 212 is demonstrated concretely.
FIG. 6 is a diagram illustrating an example of a node configuration to be controlled by the transceiver control device 200 of the present embodiment. FIG. 7 is a diagram for explaining an example of the ranking table 212 created by the transceiver control device 200 of the present embodiment in the node configuration of FIG.

  In FIG. 6, with reference to the node S controlled by the transceiver control device 200, route information destined for other nodes (A, B,..., G) and communication between the nodes are currently used. And information on the channels (wavelengths) that are present. According to FIG. 6, for example, the wavelength λ1 is used between the node D and the node E, and the wavelength λ2 is used between the node C and the node E.

  In the present embodiment, the channel information includes information on channels that can be used when the other node is a destination with one node S as a reference. In the present embodiment, the ranking table creation unit 204 extracts, for each destination, a channel that can be used when the other node is a destination based on the one node S based on the channel information. The ranking creation table 210 in FIG. 7A is created. The calculation unit (ranking table creation unit 204) refers to the created table (ranking creation table 210), calculates the channel availability by counting the number available for each channel, and rank determination unit (ranking) The table creation unit 204) determines the rank so that the number of usable channels indicated by the channel availability of the channels is higher, and creates the ranking table 212 (FIG. 7B).

  Specifically, from the network information 102 received by the network information reception unit 202 of the transceiver control device 200, the ranking table creation unit 204 can use channels (wavelengths) when other nodes are addressed with the node S as a reference. ) Is extracted, and the ranking creation table 210 shown in FIG. 7A is created. As shown in FIG. 7A, the ranking creation table 210 stores usable wavelengths in association with each destination of the reference node S.

  In the present embodiment, the ranking table creation unit 204 further refers to the created ranking creation table 210 and calculates the channel availability by counting the number that can be used for each channel (wavelength). For example, as shown in FIG. 7A, the wavelength λ1 is counted as being usable at four nodes A, C, D, and F, and the availability degree (“number of nodes that can be transmitted” in the figure) is counted. Is 4) and is recorded in the ranking table 212 as shown in FIG. 7B.

Similarly, for each channel (wavelength), the channel availability (number of transmittable nodes) is calculated and recorded in the ranking table 212. In the ranking table 212, the ranking table creating unit 204 ranks the ranking so that the number of usable channels (wavelengths) (number of transmittable nodes) indicated by the channel availability of the channels (wavelengths) increases. decide. As shown in FIG. 7B, in this example, since the number of nodes that can be transmitted is large in the order of λ3, λ2, and λ1, the wavelength λ3 is ranked first, the wavelength λ2 is ranked second, and the wavelength λ1 is ranked third. It is determined and recorded in the ranking table 212.
In the ranking table 212 of the present embodiment, when the number of transmittable nodes is the same, ranking can be performed in ascending order of wavelength. Moreover, you may rank in order with a large wavelength.

  Using the ranking table 212 created in this way, the transceiver wavelength control unit 206 of the transceiver control device 200 tunes the standby transceiver 34.

  The execution timing of the reception of network information by the network information receiving unit 202, the creation of the ranking creation table 210, or the creation of the ranking table 212 is not particularly limited. It can be set for each optical network system 1 or for each node 10. The execution timing may be scheduled, for example, according to the communication status or operating status of the system, may be regular at a certain period, or may be triggered by a predetermined condition.

  In the optical network system 1 (FIG. 1) of the present embodiment, the tuning unit (transceiver wavelength control unit 206) of the transceiver control device 200 (FIGS. 1 to 3) has the number of standby relay terminals (standby transceivers 34). When the number of channels included in the allocation order is less than the number of channels, control is performed to change the idle relay terminal (sleep transceiver) to the standby state, and the number of standby relay terminals (standby transceiver 34) is the number of channels. In the above case, control is performed so that some of the standby relay terminals (standby transceiver 34) are in the dormant state, and the relay terminal (standby transceiver 34) that has been changed to the standby state is tuned to the channel.

  In the present embodiment, the transceiver control device 200 further includes a standby relay terminal (standby transceiver) based on the operating states of a plurality of relay terminals (transceivers of the transceiver group 30 in FIG. 1) on the node 10 (FIG. 1). 34) includes the number-of-terminals acquisition unit (not shown) for acquiring the number of channels and the acquired number of standby relay terminals (standby transceivers 34) in the channel allocation order (ranking table 212 in FIG. 7B). And a determination unit (not shown) for determining whether or not the number of channels is smaller than the number of channels to be transmitted.

When the determination unit determines that the number of standby relay terminals (standby transceiver 34) is smaller than the number of channels, the transceiver wavelength control unit 206 changes the standby relay terminal (pause transceiver) to the standby state. When the determination unit determines that the number of standby relay terminals (standby transceiver 34) is equal to or greater than the number of channels, the transceiver wavelength control unit 206 determines that some of the standby relay terminals (standby transceiver 34) ) To be in a dormant state.
As described above, in this embodiment, the transceiver wavelength control unit 206 of the transceiver control device 200 changes the operating state of the transceiver in advance so that it can respond immediately during provisioning.

  Note that the terminal number acquisition unit can confirm the operating states of the plurality of transceivers on the node 10 by, for example, measuring the power consumption of each transceiver, and count and acquire the number of standby transceivers 34.

FIG. 8 is a flowchart showing the procedure of the tuning process executed by the transceiver control device 200 shown in step S1103 of FIG. The processing in FIG. 8 is performed by the transceiver wavelength control unit 206 of the transceiver control device 200.
As shown in FIG. 8, first, the terminal number acquisition unit (not shown) of the transceiver wavelength control unit 206 confirms the number of standby transceivers 34, and the determination unit (not shown) of the transceiver wavelength control unit 206 displays a ranking table. It is confirmed whether the number of wavelengths described in 212 (FIG. 7B) matches the number of standby transceivers 34 (step S1310). Here, the number of wavelengths can be the number of records in the wavelength field of the ranking table 212 in FIG. 7B. In the example of FIG. 7B, the number of wavelengths is three.

  If the number of wavelengths matches the number of standby transceivers 34 (Yes in step S1310), the transceiver wavelength control unit 206 performs tuning control of the transceiver based on the wavelengths described in the ranking table 212 (step S1311). For example, if there are three standby transceivers 34, the number of wavelengths is the same as the number of wavelengths in the ranking table 212 of FIG. Tuning control is performed for λ2 and λ3, respectively. Then, this process is terminated, and the process returns to step S1103 in FIG.

On the other hand, when the number of wavelengths described in the ranking table and the number of standby transceivers 34 do not match (No in step S1310), the determination unit of the transceiver wavelength control unit 206 determines that the number of wavelengths is greater than the number of standby transceivers 34. It is determined whether there are many (step S1320). When the number of wavelengths is larger than the number of standby transceivers 34 (Yes in step S1320), the transceiver wavelength control unit 206 performs tuning control of the standby transceivers 34 in the order of the wavelengths in the ranking table 212 (step S1330).
For example, assuming that there are two standby transceivers 34, the tuning control is performed on the two standby transceivers 34 in the order of the wavelengths λ3 and λ2 of the first and second positions in the ranking table 212 of FIG.

  Thereafter, the determination unit of the transceiver wavelength control unit 206 checks whether there is a dormant transceiver on the node 10 corresponding to the number of wavelengths that have not been tuned (step S1340). For example, in the above example, since one wavelength λ1 is not set among the three wavelength numbers, it is confirmed whether there is one pause transceiver corresponding to the wavelength number 1 not set.

  When there is a dormant transceiver (Yes in step S1340), the transceiver wavelength control unit 206 controls to change the dormant transceiver to a standby state. After changing to the standby state, the transceiver wavelength control unit 206 performs tuning control of the standby transceiver 34 to the wavelength that has not been tuned, here λ1 (step S1341). If there are a plurality of wavelengths that have not been set, the transceiver wavelength control unit 206 controls to change the paused transceiver to the standby state, and then the transceiver wavelength control unit 206 performs tuning setting in the order of the wavelengths in the ranking table 212. Each of the standby transceivers is tuned to a wavelength that has not been set. Then, this process is terminated, and the process returns to step S1103 in FIG.

  On the other hand, when there is no pause transceiver (No in step S1340), the operation of the transceiver wavelength control unit 206 is finished, and this processing is finished, and the process returns to step S1103 in FIG.

  If the number of wavelengths described in the ranking table 212 is smaller than the number of standby transceivers 34 (No in step S1320), the transceiver wavelength control unit 206 performs tuning control of the transceiver based on the wavelengths described in the ranking table 212. (Step S1321). For example, assuming that there are four standby transceivers 34, three of the four standby transceivers 34 are tuned to the three wavelengths λ1, λ2, and λ3 of the ranking table 212. Here, the condition for selecting the transceiver to be tuned from the standby transceiver 34 may be, for example, selected from the order in which the total operating time of the transceiver is short in order to smooth the use of the transceiver.

  Next, the transceiver wavelength control unit 206 suspends the standby transceiver 34 that has not been subjected to tuning control (step S1322). That is, in the above example, the transceiver wavelength control unit 206 performs control so that one of the four standby transceivers 34 is suspended. Then, this process is terminated, and the process returns to step S1103 in FIG.

As described above, according to the optical network system 1 according to the embodiment of the present invention, high-speed provisioning can be realized for a standby relay terminal (standby transceiver 34) by cooperation of network control and a transceiver. The reason for this is that a channel allocation ranking table 212 is created based on network information, and tuning control of the standby transceiver 34 is performed before provisioning, so that the standby transceiver is pre-tuned to an appropriate channel before provisioning. This is because it can be prepared.
Further, by appropriately controlling the number of standby transceivers subject to tuning control, it is possible to reduce energy while realizing high-speed provisioning.

  For example, in a node device that does not have a wavelength restriction or the like, the flexibility of the transceiver is improved, so that the transceiver can be used efficiently. At that time, there are idle transceivers and standby transceivers that are not regularly used. Here, during provisioning, there may be a difference between the default wavelength of the standby transceiver and the wavelength assigned by provisioning. When the difference between the default wavelength and the assigned wavelength of the transceiver is large, tuning takes time, and high-speed provisioning cannot be performed. The optical network system 1 according to the embodiment of the present invention can solve such problems.

(Second Embodiment)
The optical network system 1 according to the embodiment of the present invention determines a channel to be tuned in the order based on network information in consideration of wavelength allocation in a plurality of continuous wavelengths or wavelength continuity constraints of the network with the above embodiment. It is different in point.
Each component of the optical network system 1 of this embodiment is the same as that of the said embodiment shown in FIG. 1 thru | or FIG. The wavelength allocation ranking table 222 (FIG. 10B) created by the ranking table creation unit 204 of the transceiver control device 200 of the present embodiment is different from the above embodiment.

  The transceiver control device 200 of the present embodiment can also use a ranking table that combines the ranking table 212 (FIG. 7B) of the above embodiment and the ranking table 222 of the present embodiment. For example, it is possible to set a priority order and usage conditions for a plurality of ranking tables in advance or as needed, and select a ranking table to be used according to the priority order and usage conditions.

  In the optical network system 1 according to the embodiment of the present invention, the channel information includes the order of a plurality of channels (wavelengths) assigned to each node, and the ranking table creation unit 204 is based on the channel information. When other nodes are used as destinations with the node as a reference, a channel set at the time of the next communication is extracted for each destination, and a ranking creation table 220 (FIG. 10A) is created.

The ranking table creation unit 204 refers to the created ranking creation table 220, calculates the channel availability by counting the number of destination nodes set for the next communication for each channel.
Then, the ranking table creation unit 204 determines the rank so that the number is higher in the order of the number of destination nodes indicated by the channel availability.

  In the present embodiment, the ranking table creation unit 204 creates a ranking table based on network information in consideration of wavelength assignment in a plurality of continuous wavelengths or wavelength continuity constraints of a network. In this wavelength allocation, it is assumed that wavelengths are allocated within the domain 3 (FIG. 1) of the network in the order of short wavelength or long wavelength (ascending or descending). This assumes that wavelengths are allocated on the network without gaps, thereby facilitating wavelength allocation in allocation of a plurality of continuous wavelengths and wavelength continuity restrictions to remote nodes.

Hereinafter, the operation of the transceiver control device 200 in the optical network system 1 of the present embodiment will be described. In the present embodiment, the processing of FIG. 9 is performed by the ranking table creation unit 204 of the transceiver control device 200 of FIG.
FIG. 9 is a flowchart showing a processing procedure of transceiver control apparatus 200 constituting the communication control apparatus according to the embodiment of the present invention.

  First, the ranking table creation unit 204 receives the network information 102 (FIG. 1) from the network information reception unit 202 (FIG. 3) (step S2101). Next, the ranking table creation unit 204 extracts the wavelengths used in the next provisioning for the destination and the destination from the received network information 102 (step S2102).

Here, in the domain 3 of the optical network system 1 of the present embodiment, for example, it is preliminarily determined so that the wavelength is assigned in ascending order (ascending order). Therefore, the ranking table creation unit 204 extracts the usable wavelengths from the path information and the information on the wavelengths in use for each other destination node with the node S as a reference. By selecting the shortest wavelength among them, the wavelength used in the next provisioning can be extracted.
The ranking table creation unit 204 creates a ranking creation table 220 (FIG. 10A) from the extracted information and stores it in a storage unit (not shown).

  After extracting the information, the ranking table creation unit 204 calculates the number of destination nodes that can be transmitted at each wavelength from the ranking creation table 220 (step S2103). After that, the ranking table creation unit 204 creates the ranking table 222 (FIG. 10B) in order of the wavelength with the largest number of destination nodes, and stores it in the storage unit (not shown) (step S2104).

Hereinafter, based on the example of a node structure, the creation process of the ranking table 222 is demonstrated concretely.
FIG. 10 is a diagram for explaining an example of the ranking table 222 created by the transceiver control device 200 of the present embodiment in the node configuration of FIG.
From the network information received by the network information receiving unit 202 of the transceiver control device 200, when the ranking table creation unit 204 designates another node as a destination based on the node S (FIG. 6), the next communication (provisioning) 10 is extracted for each destination, and a ranking creation table 220 shown in FIG. 10A is created. As shown in FIG. 10A, the ranking creation table 220 stores the wavelength used in the next provisioning in association with each destination of the reference node S.

  In this embodiment, the ranking table creation unit 204 further refers to the created ranking creation table 220 and calculates the channel availability by counting the number of wavelengths used in the next provisioning. For example, as shown in FIG. 10 (a), the wavelength λ1 is counted as the wavelength used in the next provisioning in four nodes A, C, D, and F, and as shown in FIG. 10 (b). The availability degree (indicated as “number of nodes” in the figure) is 4, and is recorded in the ranking table 222.

  Similarly, the channel availability (number of nodes) is calculated and recorded in the ranking table 222 for each channel (wavelength). Then, in the ranking table 222, the ranking table creation unit 204 ranks the order so that the number of wavelengths (number of nodes) used in the next provisioning indicated by the channel availability of the channel is higher. As shown in FIG. 10B, in this example, the wavelength λ 1 is determined as the first position, the wavelength λ 2 is determined as the second position, and the wavelength λ 3 is determined as the third position, and is recorded in the ranking table 222.

In the ranking table 222 of the present embodiment, when the number of nodes becomes the same, ranking can be performed in ascending order of wavelength. Moreover, you may rank in order with a large wavelength.
Using the ranking table 222 created in this manner, the transceiver wavelength control unit 206 of the transceiver control device 200 performs tuning control of the standby transceiver 34. Also in this embodiment, tuning control is performed in the same procedure as the flowchart of FIG. 8 of the above embodiment.

  As described above, according to the optical network system 1 according to the embodiment of the present invention, the same effects as those of the above embodiment can be obtained, and high-speed provisioning can be performed while facilitating wavelength allocation in a plurality of continuous wavelengths or wavelength continuity constraints. Can be realized. The reason is that a ranking table is created in consideration of wavelength assignment in a plurality of continuous wavelengths or wavelength continuity constraints in a network.

(Third embodiment)
The optical network system 1 according to the embodiment of the present invention is different from the above embodiment in the order based on the coverage area of the wavelength in addition to the network information considering the wavelength assignment in the network continuous wavelength or wavelength continuity restriction. The difference is that the channel to be tuned is determined.
Each component of the optical network system 1 of this embodiment is the same as that of the said embodiment shown in FIG. 1 thru | or FIG. The wavelength allocation ranking table 232 (FIG. 13B) created by the ranking table creation unit 204 of the transceiver control device 200 of this embodiment is different from the above embodiment.

  The transceiver control apparatus 200 according to the present embodiment combines at least two of the ranking table 212 (FIG. 7B), the ranking table 222 (FIG. 10B), and the ranking table 232 according to the present embodiment. A ranking table can also be used. For example, it is possible to set a priority order and usage conditions for a plurality of ranking tables in advance or as needed, and select a ranking table to be used according to the priority order and usage conditions.

  In the optical network system 1 according to the embodiment of the present invention, the channel information includes, for each node, the number of hops to a destination and a plurality of channels assigned when the other node is a destination on the basis of one node. The ranking table creation unit 204 further includes the number of hops to the destination and the channel set at the time of the next communication when the other node is the destination based on the channel information based on the channel information. Are extracted for each destination, and a ranking creation table 230 (FIG. 13A) is created.

The ranking table creation unit 204 refers to the created ranking creation table 230 and calculates the difference in the number of hops (maximum hop count−minimum hop count) as the channel availability for each channel.
Then, the ranking table creation unit 204 determines the rank so that the difference in the number of hops indicated by the channel availability is higher in the descending order.

  In the present embodiment, the ranking table creation unit 204 creates a ranking table based on a wavelength coverage area in addition to network information that considers wavelength allocation in a plurality of continuous wavelengths or wavelength continuity constraints of a network. In this embodiment, the number of hops from the reference node to the destination node is acquired. Then, each destination is associated with a wavelength used in the next provisioning. Then, for each wavelength, the maximum hop count and the minimum hop count are obtained, and the difference between the maximum hop count and the minimum hop count is calculated, thereby grasping the coverage area in the domain 3 of each wavelength. Here, the larger the difference, the wider the range that can be covered in the domain 3 with one wavelength. In this embodiment, it is possible to select a transceiver so that a wider range can be covered by ranking so that the difference between the maximum hop count and the minimum hop count is higher in descending order.

Hereinafter, the operation of the transceiver control device 200 in the optical network system 1 of the present embodiment will be described.
FIG. 11 is a flowchart showing a processing procedure of transceiver control apparatus 200 constituting the communication control apparatus according to the embodiment of the present invention. In the present embodiment, the processing of FIG. 11 is performed by the ranking table creation unit 204 of the transceiver control device 200 of FIG.
First, the ranking table creation unit 204 receives network information from the network information reception unit 202 (step S3101).

  Next, the ranking table creation unit 204 extracts the destination, the number of hops, and the wavelength used for the next provisioning for the destination from the network information (step S3102). Here, the wavelength used in the next provisioning considers wavelength allocation in a plurality of continuous wavelengths or wavelength continuity constraints of the network, as in the above-described embodiment described with reference to FIGS. 9 and 10. The ranking table creation unit 204 creates a ranking creation table 230 (FIG. 13A) from the extracted information and stores it in a storage unit (not shown).

After extracting the information, the ranking table creation unit 204 extracts the maximum hop count and the minimum hop count of the destination node that can be transmitted at each wavelength from the ranking creation table 230 (step S3103). Then, the ranking table creation unit 204 calculates the difference between the maximum hop count and the minimum hop count at each wavelength (step S3104).
Finally, the ranking table creation unit 204 creates the ranking table 232 (FIG. 13B) in the order of wavelength in which the difference between the maximum hop count and the minimum hop count is large, and stores it in the storage unit (not shown) (step S3105). . In other words, in this embodiment, by setting the wavelength order in which the difference between the maximum hop count and the minimum hop count is large, the channel (wavelength) having a wide coverage area can be set high.

Hereinafter, based on the example of a node structure, the creation process of the ranking table 232 is demonstrated concretely.
FIG. 12 is a diagram illustrating an example of a node configuration to be controlled by the transceiver control device 200 of the present embodiment. FIG. 13 is a diagram for explaining an example of the ranking table 232 created by the transceiver control device 200 of the present embodiment in the node configuration of FIG.

  From the network information received by the network information receiving unit 202 of the transceiver control device 200, when the ranking table creation unit 204 uses another node as a destination with the node S as a reference, the number of hops to the destination and the next communication time The set channels are extracted for each destination, and a ranking creation table 230 shown in FIG. 13A is created. As shown in FIG. 13A, the ranking creation table 230 stores the number of hops and the wavelength used in the next provisioning in association with each destination of the reference node S.

  In the present embodiment, the ranking table creation unit 204 further refers to the created ranking creation table 230 and extracts the maximum hop count and the minimum hop count of the destination node for each wavelength. Further, the ranking table creation unit 204 calculates the difference between the maximum hop count and the minimum hop count for each wavelength, and calculates the availability degree. For example, as shown in FIG. 13A, in the case of the wavelength λ2, the maximum number of hops is 3 of the node E and the minimum number of hops is 1 of the node B. Then, in the case of the wavelength λ2, the ranking table creation unit 204 calculates the difference between the maximum hop count and the minimum hop count and indicates the availability (“(maximum hop count) − (minimum hop count)” in the figure). ) Is 3-1 = 2 and is recorded in the ranking table 232 as shown in FIG.

Similarly, the channel availability (difference between the maximum hop count and the minimum hop count) is calculated and recorded in the ranking table 232 for each channel (wavelength).
Finally, in the ranking table 232, the ranking table creation unit 204 ranks the ranking so that the difference between the maximum hop count and the minimum hop count increases. As shown in FIG. 13B, in this example, rankings are set in the order of wavelengths λ2, λ1, and λ3, and are recorded in the ranking table 232.

In the ranking table 232 of the present embodiment, when the difference between the maximum hop count and the minimum hop count is the same, the ranking can be performed in ascending order of wavelength. Moreover, you may rank in order with a large wavelength.
The transceiver wavelength control unit 206 of the transceiver control device 200 performs tuning control of the standby transceiver 34 using the ranking table 232 created in this way. Also in this embodiment, tuning control is performed in the same procedure as the flowchart of FIG. 8 of the above embodiment.

  As described above, according to the optical network system 1 according to the embodiment of the present invention, the same effects as the above embodiment can be obtained, and high-speed provisioning can be realized while enabling data transmission over a wide range in the network. It becomes. This is because it is highly possible that the transceiver can be tuned to a wavelength that can be used in a wide area by creating a ranking table from the wavelength coverage area.

  For example, it is conceivable to reduce the difference from the assigned wavelength by provisioning by tuning the initial setting wavelength of the standby transceiver using only the free wavelength information of the link to the adjacent node. However, in such a case, the available wavelength information may not match the available wavelength information up to a node several hops away. Therefore, there is a possibility that the initial setting wavelength and the assigned wavelength are different during provisioning up to a node that is several hops away. According to the optical network system 1 according to the embodiment of the present invention, it is possible to create a ranking table in a range that can cover wavelengths up to a node up to several hops away so that there is no difference between the initial setting wavelength and the assigned wavelength. Therefore, it is possible to tune at a wavelength assigned in advance.

(Fourth embodiment)
The optical network system 1 according to the embodiment of the present invention is different from the above embodiment in the order based on the wavelength block ratio in addition to the network information considering the wavelength assignment in the network continuous wavelength or wavelength continuity constraint. The difference is that the channel to be tuned is determined.
Each component of the optical network system 1 of this embodiment is the same as that of the said embodiment shown in FIG. 1 thru | or FIG. The wavelength allocation ranking table 242 (FIG. 15B) created by the ranking table creation unit 204 of the transceiver control device 200 of this embodiment is different from the above embodiment.

  The transceiver control device 200 of this embodiment includes a ranking table 212 (FIG. 7B), a ranking table 222 (FIG. 10B), a ranking table 232 (FIG. 13B), and the present embodiment. A ranking table combining at least two of the form ranking tables 242 may be used. For example, it is possible to set a priority order and usage conditions for a plurality of ranking tables in advance or as needed, and select a ranking table to be used according to the priority order and usage conditions.

  In the optical network system 1 according to the embodiment of the present invention, the channel information includes, for each node, a communication failure probability (block rate) to a destination when the other node is a destination on the basis of one node, and The ranking table creation unit 204 further includes a communication failure probability up to the destination and the following communication failure probability when the other node is a destination based on the one node based on the channel information. A channel set at the time of communication is extracted for each destination, and a ranking creation table 240 (FIG. 15A) is created.

The ranking table creation unit 204 refers to the created ranking creation table 240 and calculates the average value of communication failure probabilities as channel availability for each channel.
Then, the ranking table creation unit 204 determines the rank so that the average value of the communication failure probabilities indicated by the channel availability of the channels is higher in the descending order.

  In the present embodiment, the ranking table creation unit 204 creates a ranking table based on the block ratio of wavelengths in addition to network information that considers wavelength allocation in a plurality of continuous wavelengths or wavelength continuity constraints of a network. In this embodiment, the wavelength block rate is the probability that provisioning has failed when provisioning is performed. For example, the control plane 100 holds the block ratio of each wavelength from the past communication history. In the present embodiment, by ranking so that the average value of the block rate is higher in order of decreasing, it is possible to select a wavelength with a low probability of provisioning failure and provide more reliable provisioning.

Hereinafter, the operation of the transceiver control device 200 in the optical network system 1 of the present embodiment will be described.
FIG. 14 is a flowchart showing a processing procedure of transceiver control apparatus 200 constituting the communication control apparatus according to the embodiment of the present invention. In the present embodiment, the processing of FIG. 14 is performed by the ranking table creation unit 204 of the transceiver control device 200 of FIG.
First, the ranking table creation unit 204 receives network information from the network information reception unit 202 (step S4101).

Next, the ranking table creation unit 204 extracts the destination, the block rate to the destination, and the wavelength used for the next provisioning for the destination from the network information (step S4102). Here, the wavelength used in the next provisioning considers wavelength allocation in a plurality of continuous wavelengths or wavelength continuity constraints of the network, as in the above-described embodiment described with reference to FIGS.
The ranking table creation unit 204 creates a ranking creation table 240 (FIG. 15A) from the extracted information and stores it in a storage unit (not shown).

  After extracting the information, the ranking table creation unit 204 calculates an average block rate at each wavelength from the ranking creation table 240 (step S4103). Then, the ranking table creation unit 204 creates the ranking table 242 (FIG. 15B) in order of the wavelength with the lowest average block rate, and stores it in the storage unit (not shown) (step S4104).

  FIG. 15 is a diagram for explaining an example of the ranking table 242 created by the transceiver control device 200 of the present embodiment in the node configuration of FIG.

  From the network information received by the network information receiving unit 202 of the transceiver control device 200, when the ranking table creation unit 204 uses another node as a destination with the node S as a reference, the block rate up to the destination and the next communication time The set channels are extracted for each destination, and the ranking creation table 240 shown in FIG. 15A is created. As shown in FIG. 15A, the ranking creation table 240 stores the block rate and the wavelength used in the next provisioning in association with each destination of the reference node S.

  In the present embodiment, the ranking table creation unit 204 further refers to the created ranking creation table 240 and calculates an average block rate at each wavelength. For example, as shown in FIG. 15A, in the case of the wavelength λ2, the average block rate is (0.11 + 0.03) /2=0.07, and the channel availability is shown in FIG. 15B. Is recorded in the ranking table 242.

  Similarly, the channel availability (average block rate) is calculated and recorded in the ranking table 242 for each channel (wavelength). Then, the ranking table creation unit 204 ranks the ranking so that the average block rate is higher in the ascending order. As shown in FIG. 15B, in this example, rankings are set in the order of the wavelengths λ1, λ2, and λ3 having the lowest average block rate, and are recorded in the ranking table 242.

In the ranking table 242 of the present embodiment, when the average block rate is the same, the ranking can be performed in ascending order of wavelength. Moreover, you may rank in order with a large wavelength.
Using the ranking table 242 created in this manner, the transceiver wavelength control unit 206 of the transceiver control device 200 performs tuning control of the standby transceiver 34. Also in this embodiment, tuning control is performed in the same procedure as the flowchart of FIG. 8 of the above embodiment.

  As described above, according to the optical network system 1 according to the embodiment of the present invention, while providing the same effect as the above embodiment, it is possible to provide reliable provisioning by creating a ranking table from the block rate. High-speed provisioning can be performed.

As mentioned above, although embodiment of this invention was described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.
For example, when there are a plurality of routes to the destination, a ranking table may be created by extracting one route from the plurality of routes. FIG. 16 and FIG. 17 show examples of creating a ranking table based on the shortest path extracted from a plurality of paths and based on the usable wavelengths.

  For example, there are two routes from the node S as the reference to the destination A: the first route from the node S → the node A and the second route from the node S → the node C → the node A. As shown in FIG. 17A, in the case of the first route, usable wavelengths are wavelengths λ1, λ2, and λ3, and in the case of the second route, the usable wavelength is wavelength λ3.

  In this example, the ranking table creation unit 204 selects the shortest route from a plurality of routes to the destination node, extracts the usable wavelengths, and records them in the ranking creation table 250 (FIG. 17A). . As shown in FIG. 17A, the destination A has wavelengths λ1, λ2, and λ3, the destination B has wavelengths λ1, λ2, and λ3, the destination C has a wavelength λ3, and the destination D has a wavelength λ3. Then, the number of nodes that can be transmitted for each wavelength is counted and recorded in the ranking table 252 (FIG. 17B) as the channel availability.

As shown in FIG. 17B, the wavelength λ1 is 2, the wavelength λ2 is 2, and the wavelength λ3 is 4. The ranking is set in descending order of the number of nodes that can be transmitted for each wavelength. Here, in the ranking table 252 of the present embodiment, when the number of transmittable nodes is the same, ranking can be performed in ascending order of wavelength. Therefore, as shown in FIG. 17B, the order is determined in the order of the wavelengths λ3, λ1, and λ2. In addition, you may rank in order with a large wavelength.
The transceiver wavelength control unit 206 can perform tuning processing using the ranking table 252 created in this way.

  Furthermore, in another embodiment, when there are a plurality of routes to the destination, a usable table may be extracted from each of the plurality of routes to create a ranking table. FIG. 18 shows an example of creating a ranking table based on the usable wavelengths of a plurality of paths.

  In this example, the ranking table creation unit 204 extracts usable wavelengths from a plurality of paths to the destination node, respectively, and records them in the ranking creation table 260 (FIG. 18A). Then, the usable wavelengths are counted for each wavelength, the number of transmittable nodes is counted, and recorded as the channel availability in the ranking table 262 (FIG. 18B).

As shown in FIG. 18B, the wavelength λ1 is 2, the wavelength λ2 is 4, and the wavelength λ3 is 4. The ranking is set in descending order of the number of nodes that can be transmitted for each wavelength. Here, in the ranking table 262 of the present embodiment, when the number of transmittable nodes is the same, ranking can be performed in ascending order of wavelength. Therefore, as shown in FIG. 18B, the order is determined in the order of the wavelengths λ2, λ3, and λ1. In addition, you may rank in order with a large wavelength.
The transceiver wavelength control unit 206 can perform tuning processing using the ranking table 262 created in this way.

  While the present invention has been described with reference to the embodiments and examples, the present invention is not limited to the above embodiments and examples. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2011-148287 for which it applied on July 4, 2011, and takes in those the indications of all here.

Claims (10)

In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
Control means for controlling communication of the plurality of relay terminals on the network;
Information acquisition means for acquiring network information including channel information indicating the status of the channel from the control means;
Calculation means for calculating channel availability indicating availability of the channel based on the acquired network information;
A rank determining means for determining a channel allocation rank based on the calculated channel availability;
An optical network system comprising: tuning means for tuning a standby relay terminal to the allocated channel based on the determined allocation order. The optical network system according to claim 1,
The tuning means includes
When the number of standby relay terminals is less than the number of channels included in the channel allocation order, control to change the standby relay terminal to the standby state,
When the number of waiting relay terminals is equal to or greater than the number of channels, control to put some of the waiting relay terminals into a dormant state,
An optical network system for tuning the relay terminal changed to the standby state to the channel. The optical network system according to claim 1 or 2,
The channel information includes information on channels that can be used when the other node is a destination with the one node as a reference,
Based on the channel information, it further comprises a creation means for extracting a usable channel when the other node is a destination on the basis of the one node for each destination and creating a table;
The calculation means refers to the created table, calculates the channel availability by counting the usable number for each channel,
The rank determining means is an optical network system that determines the rank so that the rank is higher in order of increasing number of usable channels indicated by the channel availability of the channels. The optical network system according to any one of claims 1 to 3,
The channel information includes an order of a plurality of the channels allocated to each node,
A creation means for extracting a channel set at the time of the next communication for each destination and creating a table based on the channel information and using the other node as a destination based on the one node Prepared,
The calculating means refers to the created table, calculates the channel availability by counting the number of destination nodes set at the time of next communication for each channel,
The order determination means is an optical network system that determines the order so that the order is higher in the order of the number of destination nodes indicated by the channel availability of the channel. The optical network system according to any one of claims 1 to 4,
The channel information further includes, for each of the nodes, the number of hops to the destination and the order of the plurality of channels to be assigned when the other node is a destination on the basis of one node.
Based on the channel information, when the other node is a destination with one node as a reference, the number of hops to the destination and a channel set at the next communication are extracted for each destination. , Further comprising a creation means for creating a table,
The calculation means refers to the created table, calculates the difference in the number of hops as the channel availability for each channel,
The rank determining means is an optical network system that determines the rank so that the rank is higher in descending order of the hop count indicated by the channel availability of the channel. The optical network system according to any one of claims 1 to 5,
The channel information further includes, for each of the nodes, a communication failure probability up to the destination and the order of the plurality of channels assigned when the other node is a destination with the one node as a reference,
Based on the channel information, when the other node is a destination with one node as a reference, the communication failure probability to the destination and the channel set at the next communication are extracted for each destination. And a creation means for creating a table,
The calculation means refers to the created table, calculates an average value of the communication failure probability as the channel availability for each channel,
The rank determining means is an optical network system that determines a rank so that an average value of the communication failure probabilities indicated by the channel availability of the channels is higher in order. In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
Obtaining means for obtaining network information including channel information indicating the status of the channel from a control device that controls communication of the plurality of relay terminals on the network;
Calculation means for calculating channel availability indicating availability of the channel based on the acquired network information;
A rank determining means for determining a channel allocation rank based on the calculated channel availability;
Tuning means for tuning a standby relay terminal to the assigned channel based on the determined order of assignment. The communication control device according to claim 7, wherein
The tuning means includes
When the number of standby relay terminals is less than the number of channels, control to change the standby relay terminal to the standby state,
When the number of waiting relay terminals is equal to or greater than the number of channels, control to put some of the waiting relay terminals into a dormant state,
A communication control apparatus for tuning the relay terminal changed to the standby state to the channel. In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
A communication control device that controls communication of the plurality of relay terminals on the node,
Obtaining network information including channel information indicating the status of the channel;
Based on the acquired network information, a channel availability indicating the availability of the channel is calculated,
Determining the channel allocation order based on the calculated channel availability;
A communication control method for tuning a standby relay terminal to the allocated channel based on the determined allocation order. In a network in which a plurality of relay terminals on a plurality of nodes each assigned a plurality of channels communicate using the plurality of assigned channels, respectively.
A computer that realizes a communication control device that controls communication of a plurality of the relay terminals on the node,
Obtaining network information including channel information indicating the status of the channel;
A procedure for calculating a channel availability indicating the availability of the channel based on the acquired network information;
A step of determining an allocation order of the channels based on the calculated channel availability; and
A communication control program for causing a standby relay terminal to be tuned to the allocated channel based on the determined allocation order.

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