JP2003143210A - Optical communication network, program, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transfer burst data without the need for setting a cut- through path in advance. SOLUTION: Each node sequentially sets the cut-through path by detecting a head packet of the burst data when the burst data arrive without the need for setting the cut-through path in advance before the transfer of the burst data.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention is used in optical communication.
The present invention relates to an optical burst data transfer technique in a communication network that uses an optical wavelength as a communication medium for burst data transfer.

[0002]

2. Description of the Related Art An ordinary IP (Internet Pr
In data transfer, routers as a plurality of relay nodes are arranged from the start point to the end point, and data is transferred via the routers. At this time, each router determines the router to be transferred next by referring to the IP address given to the packet and transfers the packet.

In such an optical communication network, when reading the header information of a packet, an optical signal is first converted into an electric signal and then read. The router determines the router to be transferred next according to the IP address thus read.

Further, when transferring data in bursts, since the transfer efficiency is not good because the IP address is read for each packet, a cut-through path is previously set between the starting point and the end point. Since it is set and the IP header does not need to be read in this cut-through path section, the optical signal can be transferred at high speed as it is.

[0005]

In such conventional optical communication, it is necessary to set a cut-through path in advance when transferring burst data using the cut-through path. In order to set the cut-through path in advance, each router passing from the starting point to the end point requests that the cut-through path be set, and each router responds to this request, and the pre-setting of the cut-through path is completed for the first time. To do.

At this time, looking at the cut-through path setting procedure in each router, first, the header information of the arriving optical IP packet is converted into an electric signal, and the information corresponding to the cut-through path setting request is included therein. Is read, and if the setting request is included, the wavelength for the cut-through path setting is selected, and if the wavelength can be selected, the cut-through path setting is actually performed. And for the wavelength for which the cut-through path is set,
Since it is no longer necessary to read the header information of the IP packet, the settings are changed so that the IP packet is transferred as an optical signal in a distinctive manner from other wavelengths.

However, such a setting procedure requires a considerable amount of time. For example, it is assumed that it takes 2t seconds to set the cut-through path. If it takes 3 t seconds to transfer the burst data using this cut-through path, it takes 5 t seconds to set the cut-through path and complete the transfer of the burst data. In this example, approximately half of the 5t seconds required for burst data transfer was used for setting the cut-through path. If the time required for such advance cut-through path setting can be allotted to data transfer, further improvement in transfer efficiency can be expected.

The present invention has been made against such a background, and provides an optical communication network, a program, and a recording medium capable of efficiently performing burst data transfer without the need to set a cut-through path in advance. The purpose is to provide.

[0009]

According to the present invention, by detecting the leading packet of burst data when burst data arrives without setting a cut-through path in advance before burst data transfer, The feature is that each node sequentially sets a cut-through path. As a result, the time required for setting the cut-through path can be shortened as compared with the case where the cut-through path is set in advance, and efficient burst data transfer can be performed.

That is, a first aspect of the present invention is to provide a transmitting side edge node accommodating a data transfer source, a receiving side edge node accommodating a data transfer destination, the transmitting side edge node and the receiving side edge node. An optical communication network comprising a relay node disposed between the edge nodes of the transmitting side and the edge node of the receiving side, and setting and releasing a cut-through path passing through the relay node.

Here, a feature of the present invention is that means is provided for detecting arrival of a leading packet of burst data to the transmitting-side edge node and the relay node, and means for setting and releasing the cut-through path. When the arrival of the first packet of the burst data to the transmission side edge node or the relay node is detected by the means for detecting the arrival of the first packet, a cut-through path is transmitted from the transmission side edge node or the relay node to the next node. It is equipped with a means for setting nodes up to the stage.

As a result, it is not necessary to set a cut-through path in advance, and burst data transfer can be performed efficiently.

Further, there is provided means for detecting arrival of a final packet of burst data to the transmitting edge node, the relay node and the receiving edge node, and means for setting and releasing the cut-through path is the final packet. When the arrival of the final packet of burst data to the transmitting side edge node, the relay node or the receiving side edge node is detected by the means for detecting the arrival of the packet, the transmitting side edge node, the relay node or the receiving side It is desirable to provide a means for releasing the cut-through path set in the edge node after passing the final packet.

As a result, the used cut-through path can be released quickly and the wavelength occupied by the cut-through path can be effectively used.

The means for detecting the arrival of the head packet may be provided in each of the transmission side edge node and the relay node, or alternatively, the arrival of the head packet at the transmission side edge node and the relay node may be detected. It can also be provided as a centralized monitoring device that is a means for collectively monitoring.

Subsequent burst data amount information is written as the header information of the leading packet, and the means for detecting the arrival of the leading packet refers to this succeeding burst data amount information to determine the leading packet of the burst data. It is desirable to have means for detecting.

The burst data amount information is, for example, packet number information or packet length information following the head packet. For example, if the packet forming the burst data is a fixed length packet, the burst data amount can be known from the subsequent packet number information. Also,
If the packet forming the burst data is a variable length packet, the burst data amount can be known from the subsequent packet length information.

A threshold is set in the packet number information or the packet length information, and the means for detecting the first packet of the burst data compares the packet number information or the packet length information with the threshold value, and the packet number information. Alternatively, it is desirable to include means for detecting the packet as the first packet of burst data when the packet length information is larger than the threshold value.

At this time, means is provided for collecting the processing load information in the transmitting side edge node, the relay node and the receiving side edge node, and the processing load information collected by the collecting means is predetermined. It is desirable to include means for adaptively setting the threshold value according to the relationship with the target value of the processing load.

As a result, the bandwidth resources can be effectively utilized, and the processing load of each node can be brought close to the target value for efficient network operation.

For example, the means for adaptively setting the threshold value sets the target upper limit value and the target lower limit value of the processing load, periodically collects the processing load information, and sets the target upper limit value and the target lower limit value. It is determined whether or not there is a value of the processing load information between, and the value of the collected processing load information is not between the target upper limit value and the target lower limit value, and further, the target lower limit value. When the value of the processing load information is smaller than that, the number of packets n as a threshold value is increased by Δn, or the packet length L as a threshold value is increased by ΔL, and the value of the processing load information is higher than the target lower limit value. Is larger, the number of packets as a threshold value n is reduced by Δn, or the packet length L as a threshold value is reduced by ΔL. Alternatively, the means for adaptively setting the threshold value is a processing load target. Setting, periodically collecting the processing load information, comparing the processing load target value and the processing load information value, when the value of the processing load information is smaller than the processing load target value, as a threshold value. Number n of packets is increased by Δn, or the packet length L as a threshold value is increased by ΔL, and when the value of the processing load information is larger than the processing load target value, the number of packets n as a threshold value is decreased by Δn. Alternatively, a means for decreasing the packet length L as a threshold value by ΔL can be provided.

The means for detecting the arrival of the final packet may be provided in each of the transmitting side edge node, the relay node and the receiving side edge node,
Alternatively, it may be provided as a centralized monitoring device that is a means for collectively monitoring arrival of the final packet to the transmission-side edge node, the relay node, and the reception-side edge node.

As the header information of the final packet, information indicating that the packet is the final packet of burst data is written, and the means for detecting the arrival of the final packet displays that the final packet. It is desirable to provide means for detecting the last packet of burst data by referring to the information to be stored.

Further, a database in which the usage status of the optical wavelength is recorded is provided, and the setting means refers to this database to set the cut-through path by the unused optical wavelength, and the cut-through path of the database. Means for updating the use status of the optical wavelength used for the setting as in use, and releasing the cut-through path after passing the final packet, the use status of the released optical wavelength of the database after release of the cut-through path. It is desirable to provide a means for updating as empty.

Since each node recognizes the wavelength information for which the cut-through path can be set, the time required for wavelength selection can be shortened.

The setting means newly sets a means for holding the burst data amount information of the burst data transferred by the already set cut-through path and a cut-through path for transferring the newly arrived burst data. Means for referring to the burst data amount information of the burst data transferred by the already set cut-through path held in the holding means, the reference result of the referring means and the new The burst data amount information of the burst data that has arrived is compared with the burst data amount of the newly arrived burst data by releasing one of the cut-through paths to which burst data having a burst data amount smaller than the burst data amount of Cut-through for transferring newly arrived burst data It is desirable to provide a means to set the path.

[0027] Alternatively, the setting means sets the burst data transferred by the already set cut-through path when there is no wavelength resource for newly setting the cut-through path for transferring the newly arrived burst data. Means for detecting the amount of transfer burst data,
Any of the cut-through paths in which burst data whose untransferred burst data amount is smaller than the burst data amount obtained by referring to the burst data amount information of the newly arrived burst data is transferred according to the detection result of the detecting means. It is also possible to provide a means for releasing the above and setting a cut-through path for transferring the newly arrived burst data.

According to this, when there is no wavelength resource for newly setting a cut-through path, when new burst data arrives, the use status of the already set cut-through path is reviewed and burst data newly arrived. It is determined whether a new cut-through path for transferring data can be used for efficient burst data transfer over the entire optical communication network, and if it is determined that the cut-through path can be changed, the cut-through path settings are changed accordingly. Can be executed.

A second aspect of the present invention is a program, which is characterized by being installed in an information processing device so that the information processing device is provided with an edge node and a relay node on the transmission side in an optical communication network. As a function of setting and releasing a cut-through path passing through a node, a function of detecting the arrival of the first packet of burst data in the transmission side edge node or the relay node and a function of detecting the arrival of the first packet of burst data When the arrival of the head packet is detected, the function of setting the cut-through path from the node in which the arrival of the head packet is detected to the next node is realized.

Furthermore, a function of detecting the arrival of the final packet of burst data at the transmission side edge node, the relay node or the reception side edge node,
When the arrival of the last packet of burst data is detected by the function of detecting the arrival of the last packet, the function of releasing the cut-through path already set in the node where the arrival of the last packet is detected after passing through the last packet Is desirable.

Subsequent burst data amount information is written as the header information of the leading packet, and as a function of detecting the arrival of the leading packet, the leading packet of the burst data is referred to by referring to the subsequent burst data amount information. It is desirable to realize the function of detecting.

The burst data amount information is packet number information or packet length information subsequent to the head packet, and a threshold is set in the packet number information or the packet length information to detect the head packet of the burst data. As a function, a function of comparing the packet number information or the packet length information with the threshold value and detecting the packet as the first packet of burst data when the packet number information or the packet length information is larger than the threshold value is realized. It is desirable to let

A function of collecting processing load information is realized as a function in the transmitting side edge node, the relay node and the receiving side edge node, and the processing load information collected by this collecting function and a predetermined processing load are realized. It is desirable to realize a function of adaptively setting the threshold according to the relationship with the target value of.

As a function for adaptively setting the threshold,
Whether or not there is a value of the processing load information between the target upper limit value and the target lower limit value by setting the target upper limit value and the target lower limit value of the processing load and periodically collecting the processing load information. When the value of the processing load information collected is not between the target upper limit value and the target lower limit value, and the value of the processing load information is smaller than the target lower limit value,
Increase the number of packets n as a threshold by Δn, or
When the packet length L as a threshold is increased by ΔL and the value of the processing load information is larger than the target lower limit value, the number of packets n as a threshold is decreased by Δn, or the packet length L as a threshold is decreased by ΔL. It is desirable to realize the function of decreasing.

Alternatively, as a function of adaptively setting the threshold value, a processing load target value is set, processing load information is periodically collected, and the processing load target value and the value of the processing load information are compared. When the value of the processing load information is smaller than the processing load target value, the number of packets n as a threshold value is increased by Δn, or the packet length L as a threshold value is increased by ΔL, and When the value of the processing load information is larger, it is possible to realize the function of decreasing the number of packets n as a threshold value by Δn or decreasing the packet length L as a threshold value by ΔL.

Information indicating that the packet is the last packet of burst data is written as the header information of the last packet, and the fact that the packet is the last packet is displayed as a function of detecting the arrival of the last packet. It is desirable to realize the function of detecting the last packet of burst data by referring to the information.

A database in which the usage status of the optical wavelength is recorded is provided, and as a function for setting, a cut-through path is set by an unused optical wavelength with reference to this database, and the cut-through path of the database is set. As a function to realize a function to update the use status of the optical wavelength used in, as to release the cut-through path after passing the final packet,
It is desirable to realize a function of updating the usage status of the released optical wavelength of the database as a free space after releasing the cut-through path.

As the function to be set, a function to hold the burst data amount information of the burst data transferred by the already set cut-through path and a cut-through path to transfer the newly arrived burst data are newly set. Function for referring to the burst data amount information of the burst data transferred by the already set cut-through path held in the holding function when there is no wavelength resource for The burst data amount information of the burst data that has arrived is compared with the burst data amount of the newly arrived burst data by releasing one of the cut-through paths to which burst data having a burst data amount smaller than the burst data amount of Cut to transfer newly arrived burst data It is desirable to achieve the ability to set Rupasu.

Alternatively, as the setting function, when there is no wavelength resource for newly setting the cut-through path for transferring the newly arrived burst data, the burst data transferred by the already set cut-through path is not A function for detecting the transfer burst data amount, and a burst whose untransferred burst data amount is smaller than the burst data amount obtained by referring to the burst data amount information of the newly arrived burst data according to the detection result of this detection function. It is also possible to realize a function of releasing one of the cut-through paths through which data is transferred and setting a cut-through path for transferring the newly arrived burst data.

A third aspect of the present invention is a recording medium readable by the information processing device, in which the program of the present invention is recorded. By recording the program of the present invention on the recording medium of the present invention, the information processing apparatus can install the program of the present invention using this recording medium. Alternatively, the program of the present invention can be installed in the information processing apparatus directly from a server holding the program of the present invention via a network.

As a result, it is possible to realize an optical communication network capable of efficiently performing burst data transfer without the need to set a cut-through path in advance by an information processing device such as a computer device.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) An optical communication network according to a first embodiment of the present invention will be described with reference to FIGS. Figure 1
FIG. 1 is a schematic diagram of an optical communication network according to an embodiment of the present invention. FIG. 2 is a diagram for explaining the burst data detecting unit and the cut-through path setting / releasing unit according to the first embodiment of the present invention. FIG. 3 is a configuration diagram of a packet used in the embodiment of the present invention. FIG. 4 is a block diagram of the burst data arrival detection unit of the embodiment of the present invention. 5 and 6 are flow charts showing the operation of dynamically setting the threshold value according to the embodiment of the present invention. FIG. 7 is a diagram for explaining the database of the embodiment of the present invention.

In the embodiment of the present invention, the transmission side edge node S and the reception side edge node R are described separately for the sake of clarity, but in reality, the edge node functions as a transmission side. Both functions of the receiver and the receiver are provided, and bidirectional communication can be performed.

According to the present invention, as shown in FIG. 1, a transmission side edge node S accommodating a data transfer source, a reception side edge node R accommodating a data transfer destination, a transmission side edge node S and a reception side edge node. The relay nodes L1 to L4 arranged between the relay node L and the relay node L are provided, and a cut-through path passing through the relay node L is set between the edge node S on the transmitting side and the edge node R on the receiving side as shown in FIG. The optical communication network includes a cut-through path setting / releasing unit 10 for releasing.

Here, the feature of the present invention is that a burst data arrival detection unit 1 for detecting the arrival of the first packet of burst data to the transmission side edge node S and the relay node L is provided, and the cut-through path setting is released. Part 1
0 indicates that when the burst data arrival detection unit 1 detects the arrival of the first packet of the burst data to the transmission-side edge node S or the relay nodes L1 to L4, the cut-through path is set to the transmission-side edge node S or the relay node L.
i (i is any of 1 to 4) to the next node is set.

Further, a burst data end detection unit 2 for detecting the arrival of the final packet of burst data for the transmission side edge node S, the relay nodes L1 to L4 and the reception side edge node R is provided, and the burst data end detection unit transmits the burst data end detection unit. Side edge node S or relay node L
When the arrival of the last packet of burst data to 1 to L4 or the receiving side edge node R is detected, the cut-through path setting releasing section 10 is set to the transmitting side edge node S, the relay node Li or the receiving side edge node R. The cut-through path being released is released after passing the final packet.

The burst data detecting section 3 shown in FIG. 2 may be provided in each of the transmitting edge node S and the relay nodes L1 to L4, or alternatively, the transmitting edge node S.
Further, one or more may be provided in the optical communication network outside the node as a centralized monitoring device for collectively monitoring arrival of the first packet to the relay nodes L1 to L4.

The cut-through path setting / releasing unit 10 in the configuration of FIG. 2 may be provided in each of the transmitting edge node S, the relay nodes L1 to L4, and the receiving edge node R, or in the optical communication network. As a centralized control device that sets and releases all cut-through paths collectively, one or a plurality may be provided in the optical communication network outside the node.

As shown in FIG. 3, as the header information of the first packet, subsequent burst data amount information is written in addition to the IP address (IPA) and the packet number (I), and the burst data arrival detection unit 1 Detects the first packet of burst data by referring to the subsequent burst data amount information. This burst data amount is packet number information n or packet length information L that follows the head packet.

Packet number information n or packet length information L
As shown in FIG. 4, the burst data arrival detection unit 1 compares the packet number information n or the packet length information L with the threshold value, and the packet number information n or the packet length information L is greater than the threshold value. Is larger, the packet is detected as the first packet of burst data.

Edge node S on transmission side and relay node L
1 to L4 and the processing load information in the reception side edge node R are collected, and the threshold setting unit 6 shown in FIG. 4 determines the processing load information according to the relationship between the collected processing load information and a predetermined target value of the processing load. The threshold is adaptively set.

As a method of collecting the processing load information, each node individually transfers its own processing load information periodically to one or more processing load information collecting devices provided in the optical communication network. Alternatively, the processing load information collecting device may periodically inquire of each node about the processing load information and collect it.

An embodiment of the procedure for adaptively setting the threshold will be described with reference to FIGS. 5 and 6. In the example of FIG. 5, the target upper limit value P_upper and the target lower limit value P_lo of the processing load are set.
whether or not there is a value of the collected processing load information P between the target upper limit value P_upper and the target lower limit value P_lower of the processing load. (S1), the value of the collected processing load information P is not between the target upper limit value and the target lower limit value of the processing load, and when the value of the processing load information P is smaller than the target lower limit value. (S2), the number of packets n as a threshold is increased by Δn. Alternatively, the packet length L as a threshold is increased by ΔL (S3). Further, when the value of the processing load information P is larger than the target lower limit value (S
2) Decrease the packet number n as a threshold value by Δn. Alternatively, the packet length L as a threshold is reduced by ΔL (S4).

In the example of FIG. 6, the processing load target value P_obj
ect is set, and the processing load information P is periodically collected (S
10), comparing the processing load target value P_object with the value of the collected processing load information P, and collecting the processing load information P
Is smaller than the processing load target value (S1
1) Increase the packet number n as a threshold value by Δn. Alternatively, the packet length L as a threshold is increased by ΔL (S12). When the value of the processing load information P is larger than the processing load target value (S11), the number of packets n as a threshold is decreased by Δn. Alternatively, the packet length L as a threshold is reduced by ΔL (S13).

Thus, by adaptively changing the threshold value according to the processing load, the band resource and the processing capacity of each node can be effectively utilized.

Information indicating that the packet is the last packet of burst data is written as the header information of the last packet, and the burst data end detection unit 2
The last packet of burst data is detected by referring to the information indicating that this is the last packet.

As shown in FIG. 7, the database 7 in which the usage status of the optical wavelength is recorded is provided, and the cut-through path setting / releasing unit 10 sends the cut-through path from the transmitting-side edge node S or the relay nodes L1 to L4 to the next stage. When setting up to the node of, the cut-through path is set by referring to this database 7 by the unused optical wavelength, and the usage status of the optical wavelength used for setting the cut-through path in the database 7 is updated as being in use,
When releasing the cut-through path after passing the final packet, the usage status of the released optical wavelength in the database 7 is updated to be empty after the cut-through path is released.

The database 7 may be provided in each of the transmitting-side edge node S and the relay nodes L1 to L4, or one or more may be provided in the optical communication network outside the node.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. 8 is a block diagram of a burst data detection unit and a cut-through path setting / releasing unit according to the second embodiment of the present invention. FIG. 9 is a flowchart showing the operation of the cut-through path setting / releasing unit according to the second embodiment of the present invention.

In the second embodiment, the cut-through path setting / releasing unit 10 holds the burst length L1 as the burst data amount information of the burst data transferred by the already set cut-through path, as shown in FIG. As shown in FIG. 9, when there is no wavelength resource for newly setting the cut-through path for transferring the newly arrived burst data, the L1 holding unit 11 that has already been set is held in the L1 holding unit 11. Burst length L1 of burst data transferred by cut-through path
Refer to.

Burst length L held in L1 holding unit 11
1 and the burst length L2 as the burst data amount information of the newly arrived burst data are compared, and if L1 <L2, one of the cut-through paths in which the burst data of the burst length L1 has already been transferred. A cut-through path for releasing and transmitting the newly arrived burst data is set.

When L1 ≧ L2, the newly arrived burst data is IP-transferred without setting the cut-through path for transferring the newly arrived burst data.

Although the burst length is adopted as the burst data amount in the third embodiment, the number of packets may be adopted as the burst data amount.

According to this, when there is no wavelength resource for newly setting a cut-through path, when new burst data arrives, the use status of the already set cut-through path is reviewed and the burst data newly arrived. It is determined whether a new cut-through path for transferring data can be used for efficient burst data transfer over the entire optical communication network, and if it is determined that the cut-through path can be changed, the cut-through path settings are changed accordingly. Can be executed.

(Third Embodiment) FIG. 10 shows a third embodiment of the present invention.
And it demonstrates with reference to FIG. FIG. 10 is a block diagram of the burst data detecting unit and the cut-through path setting / releasing unit according to the third embodiment of the present invention. FIG. 11 is a flowchart showing the operation of the cut-through path setting / releasing unit according to the third embodiment of the present invention.

In the third embodiment, the cut-through path setting / releasing unit 10 transfers the cut-through path for transferring the newly arrived burst data by the already set cut-through path when there is no wavelength resource for newly setting the cut-through path. Lre for detecting the untransferred burst length Lreg as the amount of untransferred burst data of the existing burst data
a burst detection unit 12 including a g detection unit 12, and transfers burst data whose untransferred burst length Lreg is smaller than a burst length L2 obtained by referring to the burst data amount information of the newly arrived burst data according to the detection result of the Lreg detection unit 12. A cut-through path for transferring the newly arrived burst data is set by releasing any of the cut-through paths. That is, in the case of Lreg <L2, one of the cut-through paths that has already transferred the burst data of the untransferred burst length Lreg is released to set the cut-through path that transfers the newly arrived burst data.

If Lreg ≧ L2, the newly arrived burst data is IP-transferred without setting the cut-through path for transferring the newly arrived burst data.

Although the burst length is adopted as the burst data amount in the fourth embodiment, the number of packets may be adopted as the burst data amount.

According to this, when there is no wavelength resource for newly setting a cut-through path, when new burst data arrives, the use condition of the already set cut-through path is reviewed and the burst data newly arrived. It is determined whether a new cut-through path for transferring data can be used for efficient burst data transfer over the entire optical communication network, and if it is determined that the cut-through path can be changed, the cut-through path settings are changed accordingly. Can be executed.

(Fourth Embodiment) The optical communication network of the present embodiment is installed in a computer device as an information processing device, so that the transmitting side edge node S and the relay nodes L1 to L1 of the optical communication network are installed in the computer device. L4
As a function of setting and releasing a cut-through path passing through, the transmission-side edge node S or the relay node L1
When the arrival of the first packet of the burst data is detected by the function of detecting the arrival of the first packet of the burst data in L4 and the function of detecting the arrival of the first packet of the burst data, the arrival of the first packet of the cut-through path is detected. Function from the node to the next stage node, the sending edge node S, and the relay nodes L1 to L
4 or when the arrival of the last packet of burst data is detected by the function of detecting the arrival of the last packet of burst data at the receiving-side edge node R and the function of detecting the arrival of the last packet of the last packet By installing a program capable of realizing the function of releasing the cut-through path already set in the detected node after the passage of the final packet in the computer device, the program can be realized by using the computer device.

Further, the program of the present invention writes subsequent burst data amount information in the computer device as header information of the leading packet, and detects the arrival of the leading packet as a function of detecting the arrival of the leading packet. It is possible to realize the function of detecting the first packet of burst data by referring to the quantity information.

Further, the program of the present invention causes the computer device to provide the burst data amount information which is packet number information or packet length information subsequent to the head packet, and the packet number information or the packet length information has a threshold value. As a function of detecting the first packet of the burst data, the packet number information or the packet length information is compared with the threshold value, and when the packet number information or the packet length information is larger than the threshold value, the packet concerned. Can be realized as the first packet of burst data.

Further, the program of the present invention causes the computer side device to transmit to the transmitting side edge node S and the relay node L.
1 to L4 and a function of collecting the processing load information as a function in the receiving-side edge node R, and according to the relationship between the processing load information collected by the collecting function and a predetermined target value of the processing load. A function of adaptively setting the threshold can be realized.

Further, the program of the present invention has the function of adaptively setting the threshold in the computer,
Whether or not there is a value of the processing load information between the target upper limit value and the target lower limit value by setting the target upper limit value and the target lower limit value of the processing load and periodically collecting the processing load information. When the value of the processing load information collected is not between the target upper limit value and the target lower limit value, and the value of the processing load information is smaller than the target lower limit value,
Increase the number of packets n as a threshold by Δn, or
When the packet length L as a threshold is increased by ΔL and the value of the processing load information is larger than the target lower limit value, the number of packets n as a threshold is decreased by Δn, or the packet length L as a threshold is decreased by ΔL. The function of decreasing can be realized.

Alternatively, as a function of adaptively setting the threshold value, a processing load target value is set, processing load information is periodically collected, and the processing load target value and the value of the processing load information are compared. When the value of the processing load information is smaller than the processing load target value, the number of packets n as a threshold value is increased by Δn, or the packet length L as a threshold value is increased by ΔL, and When the value of the processing load information is larger, it is possible to realize the function of decreasing the number of packets n as a threshold value by Δn or decreasing the packet length L as a threshold value by ΔL.

Further, according to the program of the present invention, information indicating that the packet is the last packet of burst data is written in the computer device as header information of the last packet, and the arrival of the last packet is detected. As a function to do so, it is possible to realize a function to detect the last packet of burst data by referring to the information indicating that this is the last packet.

Further, as shown in FIG. 7, the computer program of the present invention is provided with a database 7 in which the usage state of the light wavelength is recorded, and the database 7 is referred to as the function to be set. A function to set a cut-through path by an unused optical wavelength and to update the usage status of the optical wavelength used for setting the cut-through path in the database 7 as being in use, and release the cut-through path after passing the final packet As a function to do so, it is possible to realize a function to update the usage status of the released optical wavelength of the database 7 as an empty space after releasing the cut-through path.

Further, as shown in FIG. 8, the program of the present invention holds, in the computer device, burst data amount information of the burst data transferred by the already set cut-through path as the setting function. When there is no wavelength resource for newly setting the cut-through path for transferring the newly arrived burst data, the function as the L1 holding unit 11 is transferred by the already set cut-through path held by the holding function. The burst data amount information of the newly arrived burst data by comparing the reference result of the referred function and the burst data amount information of the newly arrived burst data. Burst data of less burst data amount is transferred. It is possible to realize a function of setting a cut-through path to release one of the cut-through path you are transferring the newly arrived burst data.

Alternatively, as the function to be set, as shown in FIG.
As shown in 0, when there is no wavelength resource for newly setting the cut-through path for transferring the newly arrived burst data, the untransferred burst data amount of the burst data transferred by the already set cut-through path is set. A function as the Lreg detection unit 12 for detecting,
Any of the cut-through paths in which the burst data whose untransferred burst data amount is smaller than the burst data amount obtained by referring to the burst data amount information of the newly arrived burst data is transferred according to the detection result of the detecting function. It is also possible to realize the function of setting a cut-through path for transferring the newly arrived burst data by releasing the above.

Since the program of the present invention is recorded in the recording medium of the present invention, the computer device can install the program of the present invention using this recording medium. Alternatively, the program of the present invention can be installed in the computer device directly from a server holding the program of the present invention via a network.

As a result, it is possible to realize an optical communication network capable of efficiently performing burst data transfer without the need for setting a cut-through path in advance by the computer device.

[0082]

As described above, according to the present invention,
It is not necessary to set a cut-through path in advance, and burst data transfer can be performed efficiently.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an optical communication network according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a burst data detection unit and a cut-through path setting / releasing unit according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a packet used in the embodiment of the present invention.

FIG. 4 is a block configuration diagram of a burst data arrival detection unit according to the embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of dynamically setting a threshold value according to the embodiment of the present invention.

FIG. 6 is a flowchart showing an operation of dynamically setting a threshold value according to the embodiment of the present invention.

FIG. 7 is a diagram for explaining a database according to the embodiment of the present invention.

FIG. 8 is a block configuration diagram of a burst data detection unit and a cut-through path setting / releasing unit according to the second embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the cut-through path setting / releasing unit according to the second embodiment of the present invention.

FIG. 10 is a block configuration diagram of a burst data detection unit and a cut-through path setting / releasing unit according to the third embodiment of the present invention.

FIG. 11 is a flowchart showing the operation of the cut-through path setting / releasing unit according to the third embodiment of the present invention.

[Explanation of symbols]

1 Burst data arrival detector 2 Burst data end detector 3 Burst data detector 4 comparison section 5 threshold memory 6 Threshold setting section 7 database 10 Cut-through path setting release section 11 L1 holding part 12 Lreg detector

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Eiji Oki             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 5K002 AA01 AA06 DA02 DA05 FA01                 5K030 GA03 HA08 HD03 JA11 LB05

Claims (28)

[Claims] 1. A transmission-side edge node accommodating a data transfer source, a reception-side edge node accommodating a data transfer destination, and a relay node arranged between the transmission-side edge node and the reception-side edge node. In the optical communication network including means for setting and releasing a cut-through path passing through the relay node between the transmission side edge node and the reception side edge node, the transmission side edge node and the relay node Means for detecting the arrival of the first packet of the burst data of, the means for setting and releasing the cut-through path, the means for detecting the arrival of the first packet burst data to the transmission side edge node or the relay node When the arrival of the first packet of the An optical communication network comprising means for setting from a node or the relay node to a next stage node. 2. A means for detecting the arrival of a final packet of burst data for the transmission side edge node, the relay node and the reception side edge node is provided, and the means for setting and releasing the cut-through path is the final packet. When the arrival of the final packet of burst data to the transmitting side edge node, the relay node or the receiving side edge node is detected by the means for detecting the arrival of the packet, the transmitting side edge node, the relay node or the receiving side The optical communication network according to claim 1, further comprising means for releasing a cut-through path set in an edge node after passing through the final packet. 3. The optical communication network according to claim 1, wherein the means for detecting the arrival of the first packet is provided in each of the transmission side edge node and the relay node. 4. The optical communication network according to claim 1, wherein the means for detecting the arrival of the leading packet comprises means for collectively monitoring the arrival of the leading packet at the transmitting edge node and the relay node. . 5. As the header information of the first packet,
5. The subsequent burst data amount information is written, and the means for detecting arrival of the leading packet comprises means for detecting the leading packet of burst data by referring to the subsequent burst data amount information. Optical communication network described. 6. The optical communication network according to claim 5, wherein the burst data amount information is packet number information or packet length information subsequent to the head packet. 7. A means for detecting the first packet of the burst data, wherein a threshold is set in the packet number information or the packet length information,
A means for comparing the packet number information or the packet length information with the threshold value, and detecting the packet as a head packet of burst data when the packet number information or the packet length information is larger than the threshold value. 6. The optical communication network according to 6. 8. A means for collecting processing load information in the transmitting side edge node, the relay node and the receiving side edge node is provided, and the processing load information collected by the collecting means and a predetermined processing load. 8. The optical communication network according to claim 7, further comprising means for adaptively setting the threshold according to a relationship with the target value of. 9. The means for adaptively setting the threshold sets a target upper limit value and a target lower limit value of the processing load, periodically collects processing load information, and sets the target upper limit value and the target lower limit value. It is determined whether or not there is a value of the processing load information between, and the value of the collected processing load information is not between the target upper limit value and the target lower limit value, and further, the target lower limit value. When the value of the processing load information is smaller than
Increase the number of packets n as a threshold by Δn, or
When the packet length L as a threshold is increased by ΔL and the value of the processing load information is larger than the target lower limit value, the number of packets n as a threshold is decreased by Δn, or the packet length L as a threshold is decreased by ΔL. 9. The optical communication network according to claim 8, comprising means for reducing the number. 10. The means for adaptively setting the threshold value sets a processing load target value, periodically collects processing load information, and compares the processing load target value with the value of the processing load information. When the value of the processing load information is smaller than the processing load target value, the number of packets n as a threshold value is increased by Δn, or the packet length L as a threshold value is increased by ΔL, and the processing load target value is larger than the processing load target value. 9. The optical communication network according to claim 8, further comprising means for decreasing the packet number n as a threshold value by Δn or decreasing the packet length L as a threshold value by ΔL when the value of the processing load information is larger. 11. The optical communication network according to claim 2, wherein the means for detecting the arrival of the final packet is provided in each of the transmission side edge node, the relay node and the reception side edge node. 12. The means for detecting the arrival of the final packet comprises a means for collectively monitoring the arrival of the final packet to the transmission-side edge node, the relay node, and the reception-side edge node. 2. The optical communication network according to 2. 13. As the header information of the final packet, information indicating that the packet is the final packet of burst data is written, and the means for detecting the arrival of the final packet is the final packet. 13. The optical communication network according to claim 11, further comprising means for detecting the last packet of burst data by referring to information indicating 14. A database in which the usage status of optical wavelengths is recorded is provided, and the setting means refers to this database to set a cut-through path by an unused optical wavelength and the cut-through path of the database. Means for updating the usage status of the optical wavelength used for the setting as being in use, the means for releasing the cut-through path after passing the final packet, the usage status of the released optical wavelength of the database after release of the cut-through path The optical communication network according to claim 1, further comprising: a means for updating as an empty space. 15. The setting means newly holds a means for holding burst data amount information of burst data transferred by the already set cut-through path, and a cut-through path for transferring newly arrived burst data. When there is no wavelength resource for setting, a means for referring to the burst data amount information of the burst data transferred by the already set cut-through path held in the holding means, and a reference result of the referring means. The burst data amount information of the newly arrived burst data is compared to release any one of the cut-through paths through which the burst data amount of the burst data amount smaller than the burst data amount of the newly arrived burst data is transferred. Cut to transfer the newly arrived burst data The optical communication network according to claim 1 or 5, further comprising means for setting a through path. 16. The setting means is configured such that when there is no wavelength resource for newly setting a cut-through path for transferring newly arrived burst data, the burst data transferred by the already set cut-through path is not transmitted. A means for detecting the amount of transferred burst data, and a burst in which the amount of untransferred burst data is smaller than the burst data amount obtained by referring to the burst data amount information of the newly arrived burst data according to the detection result of this detecting means. The optical communication network according to claim 1 or 5, further comprising means for releasing one of the cut-through paths through which data is transferred and setting a cut-through path for transferring the newly arrived burst data. 17. A function for setting and releasing a cut-through path passing through a transmission-side edge node, a relay node, and a reception-side edge node in an optical communication network by installing the information processing device in the information processing device, When the arrival of the first packet of the burst data is detected by the function of detecting the arrival of the first packet of the burst data at the transmission side edge node or the relay node and the function of detecting the arrival of the first packet of the burst data, the cut-through path is set to the first packet. A program that realizes a function of setting from a node in which the arrival of a packet is detected to a node in the next stage. 18. The arrival of the last packet of burst data by the function of detecting the arrival of the last packet of burst data at the transmission side edge node or the relay node or the reception side edge node, and the function of detecting the arrival of the last packet. 18. The program according to claim 17, which realizes a function of releasing the cut-through path that has already been set in the node in which the arrival of the final packet has been detected, after the passage of the final packet. 19. The header information of the first packet is written with subsequent burst data amount information. As a function of detecting the arrival of the first packet, the burst data header is referred to by referring to the subsequent burst data amount information. The program according to claim 17 or 18, which realizes a function of detecting a packet. 20. The burst data amount information is packet number information or packet length information subsequent to the head packet, a threshold is set in the packet number information or the packet length information, and the head packet of the burst data is set. As a function of detecting, a function of comparing the packet number information or the packet length information with the threshold value and detecting the packet as the first packet of burst data when the packet number information or the packet length information is larger than the threshold value. 20. The program according to claim 19, which realizes 21. A function of collecting processing load information is realized as a function of the transmitting-side edge node, the relay node, and the receiving-side edge node, and the processing load information collected by the collecting function is predetermined. 21. A function of adaptively setting the threshold according to a relationship with a target value of a processing load is realized.
The listed program. 22. As a function of adaptively setting the threshold, a target upper limit value and a target lower limit value of a processing load are set, processing load information is periodically collected, and the target upper limit value and the target lower limit value are collected. It is determined whether or not there is a value of the processing load information between, and the value of the collected processing load information is not between the target upper limit value and the target lower limit value, and further, the target lower limit value. When the value of the processing load information is smaller than
Increase the number of packets n as a threshold by Δn, or
When the packet length L as a threshold is increased by ΔL and the value of the processing load information is larger than the target lower limit value, the number of packets n as a threshold is decreased by Δn, or the packet length L as a threshold is decreased by ΔL. 22. The program according to claim 21, which realizes a function of decreasing. 23. As a function of adaptively setting the threshold, a processing load target value is set, processing load information is periodically collected, and the processing load target value and the value of the processing load information are compared. When the value of the processing load information is smaller than the processing load target value, the number of packets n as a threshold value is increased by Δn, or the packet length L as a threshold value is increased by ΔL, and the processing load target value is larger than the processing load target value. 22. The program according to claim 21, wherein when the value of the processing load information is larger, a function of reducing the packet number n as a threshold value by Δn or reducing the packet length L as a threshold value by ΔL is realized. 24. As the header information of the final packet, information indicating that the packet is the last packet of burst data is written, and the function of detecting the arrival of the last packet is that the packet is the last packet. 19. The program according to claim 18, which realizes a function of detecting the last packet of burst data by referring to the information for displaying. 25. A database in which the usage status of optical wavelengths is recorded is provided, and as a function to set, a cut-through path is set by an unused optical wavelength by referring to this database, and the cut-through path of the database is set. The function of updating the use state of the optical wavelength used for the setting as being in use, and the function of releasing the cut-through path after passing the final packet is the use of the released optical wavelength of the database after releasing the cut-through path. 18. The program according to claim 17, which realizes a function of updating the status as free. 26. As the setting function, a function of holding burst data amount information of burst data transferred by the already set cut-through path, and a cut-through path for transferring newly arrived burst data are newly added. When there is no wavelength resource for setting, a function for referring to the burst data amount information of the burst data transferred by the already set cut-through path held in the holding function, and a reference result of this referencing function The burst data amount information of the newly arrived burst data is compared to release any one of the cut-through paths through which the burst data amount of the burst data amount smaller than the burst data amount of the newly arrived burst data is transferred. To transfer the newly arrived burst data. 20. The program according to claim 17, which realizes a function of setting a pass-through path. 27. As a function of the setting, when there is no wavelength resource for newly setting a cut-through path for transferring newly arrived burst data, burst data transferred by the already set cut-through path is not available. A function for detecting the transfer burst data amount, and a burst whose untransferred burst data amount is smaller than the burst data amount obtained by referring to the burst data amount information of the newly arrived burst data according to the detection result of this detecting function. 20. The program according to claim 17 or 19, which realizes a function of releasing one of the cut-through paths through which data is transferred and setting a cut-through path for transferring the newly arrived burst data. 28. A recording medium readable by the information processing device, wherein the program according to claim 17 is recorded.