JP2012222789A - Transmission path determination system, network management device, and transmission path determination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission path determination system, a network management device, and a transmission path determination method capable of determining a path to restrain characteristic deterioration of optical signals when adjusting a characteristic value of a transmission path.SOLUTION: This transmission path determination system comprises a transmission path candidate extraction part 11 for extracting plural transmission path candidates between nodes of a transmission end point and a reception end point of optical signals; a transmission path characteristic measuring part 12 for measuring a transmission path characteristic value of the transmission path candidate; a transmission path characteristic correction part 22 for calculating the respective transmission characteristic candidate values of the plural extracted transmission path candidates, and applying the transmission path characteristic correction value to a node forming the plural extracted transmission path candidate; a quality measuring part 24 for measuring the transmission path characteristic value of the transmission path, to which the transmission characteristic candidate value is applied; and a transmission path determination part 25 for determining the transmission path of the optical signals between the transmission end point and the reception end point according to measurement results of the transmission path characteristic value on the transmission path candidate, to which the transmission characteristic correction value is applied.

Description

  The present invention relates to a transmission path determination system that determines a transmission path of an optical signal formed using a plurality of nodes using transmission path characteristic knowledge.

  In recent years, with the rapid development of the Internet, traffic flowing through the network is increasing. Furthermore, an increase in transmission speed is desired due to the spread of services using moving image content. Therefore, the necessity of constructing a mesh network using an optical transport system capable of improving the transmission speed is increasing.

  For signal conduction in the optical transport system, it is essential to adjust the transmission path characteristic value. Also, when transmission path protection control occurs, such as when a failure occurs in the transmission path of the optical transport system, it is necessary to measure and adjust the transmission path characteristics again on the new transmission path. Although it takes time to measure and adjust the transmission path characteristics, the request for the transmission path disconnection time during transmission path protection control is about several tens to several hundreds of milliseconds. Therefore, it is highly necessary to shorten the time required for measuring and adjusting the transmission path characteristics.

  Patent Document 1 discloses dispersion compensation for an optical communication path that performs dynamic control for shortening the reception data reproduction delay time by starting dispersion compensation between the ends of the optical communication path before receiving an optical signal. A system is disclosed. Specifically, the dispersion compensation system includes a data transmission network and a network control network. When the LSP (Label Switch Path) path set in the data transmission network is determined, the network control network obtains a dispersion value to be compensated at the reception end or transmission end on the LSP path. Furthermore, the network control network can reduce the overhead at the time of path switching and the time for communication path control by performing the process for obtaining the dispersion value to be compensated before the LSP generation process.

  Patent Document 2 discloses a node device that performs the following processing that constitutes an optical network. When a route is determined using a routing protocol such as OSPF, the node device calculates a distribution amount of the route. Next, the node device sets a tunable dispersion compensator using a predetermined parameter regarding the dispersion amount, and adjusts the dispersion amount. Thereby, a dispersion compensation value corresponding to the calculated dispersion amount can be set in the route of the optical network formed by the node device.

JP 2004-274238 A JP 2007-201953 A

  However, the optical networks disclosed in Patent Documents 1 and 2 adjust the amount of dispersion in the determined path, and transmit and receive optical signals. Therefore, there is a problem that the optical signal must be transmitted / received using the determined path even when the adjustment of the dispersion amount is not appropriate and the characteristics of the optical signal deteriorate.

  In order to solve such a problem, the present invention provides a transmission path determination system and a network management apparatus capable of determining a path so as to suppress deterioration in characteristics of an optical signal when adjusting the characteristic value of the transmission path. It is another object of the present invention to provide a transmission path determination method.

  A transmission path determination system according to a first aspect of the present invention is a transmission path determination system that determines a transmission path of an optical signal formed by using a plurality of nodes, the node of the transmission end point of the optical signal and reception of the optical signal. Transmission path candidate extraction means for extracting a plurality of transmission path candidates between the end node, transmission path characteristic measurement means for measuring transmission path characteristic values in the transmission path candidates, and the extracted transmission path candidates A transmission path characteristic correction value for calculating the transmission path characteristic correction value for each of the transmission path characteristic correction values, and applying the calculated transmission path characteristic correction value to a node forming the extracted plurality of transmission path candidates; According to the measurement result of the transmission line characteristic value in the transmission line candidate to which the transmission characteristic correction value is applied, and the quality measurement means for measuring the transmission line characteristic value of each transmission line to which the transmission characteristic is applied. A transmission path determination section that determines a transmission path of the optical signal between the receiving endpoint and the sending endpoint, but with a.

  A network management apparatus according to a second aspect of the present invention is a network management apparatus used in a transmission path determination system for determining a transmission path of an optical signal formed by using a plurality of nodes, and transmitting the optical signal Transmission path characteristic collection means for collecting transmission path characteristic values in a plurality of transmission path candidates between the node at the end point and the node at the reception end point; and the plurality of transmission paths based on the collected transmission path characteristic values A transmission path characteristic correction value is calculated for each candidate, and the transmission path characteristic correction value is applied to a node that forms the transmission path candidate, and the transmission path characteristic correction value is applied to each candidate. A transmission path determination unit that determines a transmission path of the optical signal between the node at the transmission end point and the node at the reception end point in accordance with a transmission path characteristic value measured in the transmission path And, those with a.

  A transmission path determination method according to a third aspect of the present invention is a transmission path determination method for a network management apparatus used in a transmission path determination system for determining a transmission path of an optical signal formed using a plurality of nodes. Collecting transmission path characteristic values in a plurality of transmission path candidates between a node at a transmission end point and a node at a reception end point of the optical signal, and based on the collected transmission path characteristic values, the plurality of transmission paths Calculate a transmission line characteristic correction value for each candidate, notify the calculated transmission line characteristic correction value to a node that forms the transmission line candidate, and measure the transmission line characteristic correction value in each transmission line to which the transmission line characteristic correction value is applied. The transmission path of the optical signal between the node at the transmission end point and the node at the reception end point is determined according to the transmission path characteristic value.

  According to the present invention, it is possible to provide a transmission path determination system, a network management apparatus, and a transmission path determination method capable of determining a path so as to suppress deterioration in characteristics of an optical signal when adjusting the characteristic value of the transmission path. it can.

1 is a configuration diagram of a node device and a network management device according to a first exemplary embodiment; 1 is an overall configuration diagram of a transmission path determination system according to a first exemplary embodiment; 3 is a sequence of transmission path determination processing in the transmission path determination system according to the first exemplary embodiment; FIG. 6 is a diagram illustrating a flow of transmission path application processing of the node device according to the first exemplary embodiment; It is a figure which shows the flow of the transmission-line determination process of the network management apparatus concerning Embodiment 2. FIG. FIG. 10 is a diagram illustrating a flow of transmission path determination processing of the network management device according to the third exemplary embodiment.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. A configuration example of the transmission path determination system according to the first exemplary embodiment of the present invention will be described with reference to FIG. The transmission path determination system includes a node device 1 and a network management device 20. The transmission line system includes a plurality of node devices, and an optical signal transmission line is formed on the optical transport system using the plurality of node devices.

  The node device 1 includes a transmission path candidate extraction unit 11, a transmission path characteristic measurement unit 12, a transmission path characteristic value application unit 13, a communication unit 14, and a transmission path application unit 15. The network management device 20 includes a transmission path characteristic collection unit 21, a transmission path characteristic correction unit 22, a communication unit 23, a quality measurement unit 24, and a transmission path determination unit 25. Here, the transmission path candidate extraction unit 11, the transmission path characteristic measurement unit 12, the transmission path characteristic value application unit 13, the communication unit 14, the transmission path application unit 15, the transmission path characteristic collection unit 21, and the transmission path The characteristic correction unit 22, the communication unit 23, the quality measurement unit 24, and the transmission path determination unit 25 are not limited to the function sharing to the node device 1 and the network management device 20 as described above. For example, the transmission path candidate extraction unit 11, the quality measurement unit 24, and the like may be mounted on an external device or the like installed outside the node device 1 or the network management device 20. Also, some functions of the node device 1 may be installed in the network management device 20, and some functions of the network management device 20 may be installed in the node device 1.

  The configuration of the node device 1 will be described below. The transmission path candidate extraction unit 11 constitutes transmission path candidate extraction means. The transmission path candidate extraction unit 11 extracts a plurality of transmission path candidates between the node apparatus serving as the transmission end point of the optical signal and the node apparatus serving as the reception end point. There are a plurality of node devices between the node device serving as the transmission endpoint and the node device serving as the reception endpoint. Therefore, there are a plurality of paths from the node device serving as the transmission endpoint to the node device serving as the reception endpoint. The transmission path candidate may be a path dynamically set using a routing protocol such as OSPF, or may be a path in which a path between node devices is fixedly set. The transmission path candidate extraction unit 11 outputs information on the extracted transmission path candidates to the transmission path characteristic measurement unit 12, the transmission path characteristic value application unit 13, and the transmission path application unit 15.

  The transmission path characteristic measurement unit 12 measures the transmission path characteristic value in the transmission path candidate extracted by the transmission path candidate extraction unit 11. The transmission path characteristic measurement unit 12 measures a transmission path characteristic value between a node apparatus on the transmission path candidate extracted by the transmission path candidate extraction unit 11, for example, a node apparatus adjacent to the node apparatus 1. The transmission line characteristic value includes, for example, a dispersion value (or dispersion amount), a gain factor, and the like. The transmission path characteristic measurement unit 12 outputs the measured transmission path characteristic value to the communication unit 14. The transmission path characteristic value is transmitted to the network management device 20 via the communication unit 14.

  The transmission path characteristic value application unit 13 receives from the communication unit 14 transmission path characteristic correction values determined based on transmission path characteristic values collected from a plurality of node devices on the transmission path candidate. The transmission path characteristic correction value is calculated by the network management device 20 and transmitted from the network management device 20 to the communication unit 14. The transmission path characteristic value application unit 13 sets the transmission path characteristic correction value received via the communication unit 14. The transmission path characteristic correction value is, for example, a value that is corrected so as to reduce a dispersion value that is generated when a signal is transmitted and received between the node device 1 and an adjacent node. Also, the transmission path characteristic correction value is a gain rate that allows an adjacent node device to receive a signal without error when the gain of a signal transmitted from the node device 1 to the adjacent node device is not sufficient. is there.

  The transmission path application unit 15 receives and sets information regarding the transmission path determined by the network management device 20 via the communication unit 14. Thereafter, the node device 1 performs optical signal communication with the adjacent node device on the determined transmission path.

  Next, components of the network management device 20 will be described. The communication unit 23 performs communication with the communication unit 14 of the node device 1. For communication between the node device 1 and the network management device 20, an optical transport system may be used, or a wireless communication system or the like may be used.

  The transmission path characteristic collection unit 21 receives a transmission path characteristic value transmitted from the node device 1. Note that the transmission path characteristic collection unit 21 receives transmission path characteristic values from a plurality of node apparatuses in addition to the node apparatus 1. The transmission line characteristic collection unit 21 outputs the received transmission line characteristic value to the transmission line characteristic correction unit 22.

  The transmission path characteristic correction unit 22 calculates a transmission path characteristic correction value for each of a plurality of transmission path candidates using the received transmission path characteristic value. For example, when a dispersion value is received as a transmission path characteristic value, a dispersion compensation value in each node device is calculated so as to decrease the dispersion value in each of a plurality of transmission path candidates. In addition, when a gain factor is received as a transmission channel characteristic value, in each of a plurality of transmission channel candidates, the gain factor is increased or the gain factor is approximated to a predetermined appropriate value. A compensation value of the gain factor in the node device is calculated. The transmission path characteristic correction value includes at least one of a dispersion compensation value and a gain factor compensation value. The transmission path characteristic correction unit 22 may hold a data table in which transmission path characteristic values and transmission path characteristic correction values are set in advance, and extract transmission path characteristic correction values according to the received transmission path characteristic values. . The transmission path characteristic correction unit 22 outputs the calculated or extracted transmission path characteristic correction value to the communication unit 23. The transmission path characteristic correction value is transmitted to the node device 1 via the communication unit 23.

  The quality measuring unit 24 measures the quality of each transmission path to which the transmission path characteristic correction value is applied. The quality measuring unit 24 measures, for example, a transmission path characteristic value as the quality to be measured. For example, the quality measuring unit 24 may output a measurement signal or the like to each node forming the transmission path candidate, and measure the transmission path characteristic value using the output measurement signal. The quality measuring unit 24 may measure the transmission path characteristic value between the nodes forming the transmission path candidate, and for each transmission path candidate, between the node apparatus serving as the transmission endpoint and the node apparatus serving as the reception endpoint. The transmission path characteristic value may be measured. The quality measuring unit 24, when measuring the transmission path characteristic value between the nodes forming the transmission path candidate, combines the measured transmission path characteristic value with the node apparatus serving as the reception endpoint from the node apparatus serving as the transmission endpoint. The transmission line characteristic value between is calculated.

  The quality measurement unit 24 outputs the dispersion value or gain factor calculated as the transmission channel characteristic value, or the dispersion value and gain factor to the transmission channel determination unit 25.

  The transmission path determination unit 25 transmits the optical signal transmission path between the node at the transmission end point and the node at the reception end point in accordance with the measurement result of the transmission path characteristic value in each transmission path candidate to which the transmission characteristic correction value is applied. To decide. The transmission path determination unit 25 may determine a transmission path candidate having a small dispersion value as a transmission path from among a plurality of transmission path candidates, or may determine a transmission path candidate having a large gain factor as a transmission path. In addition, when the transmission path determined using the dispersion value is different from the transmission path determined using the gain factor, priority is set for the dispersion value and the gain factor, and the parameter with the higher priority is set. You may make it employ | adopt the transmission path determined using. The transmission path determination unit 25 outputs information regarding the determined transmission path to the communication unit 23. Information regarding the determined transmission path is transmitted to the node device 1 via the communication unit 23.

  Next, an overall configuration example of the transmission path determination system according to the first exemplary embodiment of the present invention will be described using FIG. The transmission path determination system includes node devices 1 to 7 and a network management device 20. The node devices 1 to 7 construct an optical transport system. That is, the node devices 1 to 7 perform data communication by transmitting and receiving optical signals. Further, the node devices 1 to 7 are respectively connected to the network management device 20. For connection between the node devices 1 to 7 and the network management device 20, an optical transport system may be used, or other wireless communication systems, for example, may be used.

  The node device 1 is connected to the node device 2. The node device 2 is connected to the node device 1 and the node devices 3 to 5. The node devices 3 to 5 are connected to the node device 2 and the node device 6. The node device 6 is connected to the node devices 3 to 5 and the node device 7. In FIG. 2, it is assumed that the node device 1 is a node device serving as a transmission endpoint, and the node device 7 is a node device serving as a reception endpoint. For this reason, the path between the node apparatus 1 and the node apparatus 7 includes a path that passes through the node apparatus 3, a path that passes through the node apparatus 4, a path that passes through the node apparatus 5, and three transmission path candidates. .

  Next, the flow of transmission path determination processing in the transmission path determination system according to the embodiment of the present invention will be described using FIG. First, the network management device 20 transmits a transmission path characteristic value measurement instruction between the node devices 1 and 2 to the node device 1 (S1). Similarly, the network management device 20 transmits a transmission path characteristic value measurement instruction between the node devices 2 and 3 to the node device 2 (S2), and between the node devices 5 and 6 to the node device 6. A transmission path characteristic value measurement instruction is transmitted (S3), and a transmission path characteristic value measurement instruction between the node apparatuses 6 and 7 is transmitted to the node apparatus 7 (S4). Although omitted in FIG. 3, a transmission path characteristic value measurement instruction is similarly transmitted to the node apparatuses 3 to 5. Also in the following explanation, explanation of processing in node devices 3-5 is omitted.

  Next, after receiving the transmission path characteristic value measurement instruction, the node device 1 transmits the measurement result of the measured transmission path characteristic value to the network management apparatus 20 (S5). Similarly, the node devices 2, 6 and 7 also transmit the measurement result of the transmission path characteristic value to the network management device 20 (S6 to S8).

  Next, the network management apparatus 20 transmits a transmission path characteristic correction value to the node apparatus 1 based on the transmission path characteristic values received from the node apparatuses 1 to 7 (S9). Further, the network management device 20 transmits a transmission path characteristic correction value to the node device 2 (S10). Here, the node device 2 is connected to the node devices 3 to 5. Therefore, the node device 2 has a transmission path characteristic correction value when connected to the node device 3, a transmission path characteristic correction value when connected to the node device 4, and a transmission path when connected to the node device 5. The characteristic correction value is received. Further, the network device 20 transmits the transmission path characteristic correction value to the node devices 6 and 7 (S11, S12).

  Next, the network management apparatus 20 receives the transmission path characteristic value in the section to which the transmission path characteristic correction value is applied from the node apparatuses 1 to 7 (S13 to S16). For example, the node apparatus 2 transmits to the network management apparatus 20 a transmission path characteristic value with the node apparatus 3, a transmission path characteristic value with the node apparatus 4, and a transmission path characteristic value with the node apparatus 5. . Here, the network management device 20 receives the transmission path characteristic value from the node devices 1 to 7 as the quality measurement result.

  Next, the network management apparatus 20 determines a transmission path based on the collected transmission path characteristic value, and notifies the determined transmission path to the node apparatuses 1 to 7 (S17 to S20). For example, when a transmission path that passes through the node apparatus 3 is determined, the network management apparatus 20 notifies the node apparatuses 1 to 7 that the transmission path that passes through the node apparatus 3 has been determined. Alternatively, the network management device 20 may notify each node device of adjacent node devices. For example, the node device 1 is notified that it is connected to the node device 2, the node device 2 is notified that it is connected to the node devices 1 and 3, and the node device 3 is It is notified that it is connected to the node devices 2 and 6, the node device 6 is notified that it is connected to the node devices 3 and 7, and the node device 7 is connected to the node device 6. You may notify that.

  As described above, by using the transmission path determination system according to the first exemplary embodiment of the present invention, the transmission path can be determined in consideration of the transmission path characteristic value. Therefore, it is possible to transmit and receive optical signals by selecting a high-quality transmission line as compared with the case where the transmission line characteristic value is adjusted for the determined transmission line.

(Embodiment 2)
Subsequently, a processing flow of the node device 1 according to the second exemplary embodiment of the present invention will be described with reference to FIG. In the second embodiment, a transmission path determination process in the node device 2 when a failure occurs in the link between the node device 3 and the node device 6 will be described. The link failure location is not limited between the node device 3 and the node device 6. The configuration of the node device 2 is the same as that of the node device 1 in FIG.

  First, the node device 2 detects that a failure has occurred between the node device 3 and the node device 6 (S11). The node device 2 receives the failure notification from the node device 3 to detect that a failure has occurred between the node device 3 and the node device 6. Alternatively, the node device 2 determines that a failure has occurred in any link or node device between the node device 3 and the node device 7 when data is not received via the node device 3 for a predetermined period. Also good. Alternatively, when the node device 2 receives a transmission error signal from the node device 3 for the data transmitted via the node device 3, any link or node device between the node device 3 and the node device 7 It may be determined that a failure has occurred. The node device 2 may detect the occurrence of a failure using a failure detection function in a routing protocol such as OSPF.

  Next, the transmission path candidate extraction unit 11 of the node device 2 extracts transmission path candidates (S12). For example, the transmission path candidate extraction unit 11 extracts a transmission path candidate 1 that communicates with the node apparatus 6 via the node apparatus 4 and a transmission path candidate 2 that communicates with the node apparatus 6 via the node apparatus 5. To do. The transmission path candidate extraction unit 11 may extract a route previously set as an alternative path when extracting the transmission path candidate. The transmission path candidate extraction unit 11 may select a transmission path candidate using a dynamic routing protocol such as OSPF or GMPLS. It may be extracted.

  Next, the transmission path characteristic measuring unit 12 measures the variance value with the node device 4 and the variance value with the node device 5 (S13). In the second embodiment, an example in which the dispersion value is measured as the transmission path characteristic will be described. However, the gain factor may be measured as the transmission path characteristic. The dispersion value measured by the transmission path characteristic measuring unit 12 is transmitted to the network management device 20, and the network management device 20 calculates the dispersion compensation value.

  Next, the transmission path characteristic value application unit 13 receives a dispersion compensation value from the network management device 20 (S14). Specifically, the transmission path characteristic value application unit 13 receives a dispersion compensation value to be applied to a route between the node device 4 and a dispersion compensation value to be applied to a route between the node device 5.

  Next, the transmission path characteristic value application unit 13 compares the received dispersion compensation value with a predetermined threshold value (S15). If the dispersion compensation value is lower than a predetermined threshold value, the transmission path characteristic value application unit 13 adjusts the dispersion value of the corresponding transmission path using the dispersion compensation value (S16). For example, when four transmission path candidates are extracted, if the dispersion compensation values in two of the transmission paths are lower than the threshold value, the dispersion values in the two transmission paths are adjusted. If there is no dispersion compensation value lower than the threshold value, the transmission path characteristic value application unit 13 adjusts the dispersion values of all the extracted transmission path candidates (S17). By doing so, it is possible to select a transmission line with a small dispersion value and a good quality. Furthermore, transmission path candidates that have a relatively large dispersion value and cannot be compensated for can be excluded from the alternative paths.

  Next, the transmission path characteristic measurement unit 12 measures the dispersion value in the transmission path candidate whose dispersion value is compensated (S18). For example, the transmission path characteristic measurement unit 12 measures a dispersion value in a transmission path between the node apparatus 4 and a dispersion value in a transmission path between the node apparatus 5. The transmission path characteristic measurement unit 12 transmits the measurement result to the network management device 20. In step S15, when the transmission path candidates for adjusting the dispersion value are narrowed down, that is, when it is determined YES in step S15, the transmission path characteristic measurement unit 12 calculates the transmission path characteristic values in all transmission path candidates. Since there is no need to measure, it is possible to reduce the time required for measuring the transmission path characteristic value.

  Next, the transmission line application unit 15 receives information on the selected transmission line from the network management device 20 based on the measurement result in the transmission line characteristic measurement unit 12, and transmits an alternative transmission line from the transmission line candidates. Is selected and applied (S19).

  Subsequently, a flow of a transmission path determination process in the network management device 20 according to the second exemplary embodiment of the present invention will be described with reference to FIG. First, the transmission path characteristic collection unit 21 receives a dispersion value between node devices from each node device (S21). Next, the transmission path characteristic correction unit 22 calculates a dispersion compensation value to be notified to each node apparatus so as to suppress dispersion in each path from the node apparatus 1 to the node apparatus 7 (S22). The dispersion compensation value calculated by the transmission path characteristic correction unit 22 is transmitted to each node.

  Subsequently, the quality measurement unit 24 receives from each node device the dispersion value in each transmission path whose dispersion value has been adjusted (S23). Next, the transmission path determination unit 25 determines a transmission path as an alternative path for the failure location based on the received dispersion value, and notifies each node apparatus (S24).

  As described above, by using the transmission line determination system according to the second exemplary embodiment of the present invention, even when a failure occurs in a part of the optical signal transmission line network, the transmission line quality is good. Can be selected dynamically. That is, by measuring the dispersion value in the transmission path after the dispersion value is adjusted and determining the transmission path based on the measurement result, the transmission path can be determined in consideration of the quality of the transmission path.

(Embodiment 3)
Subsequently, a flow of a transmission path determination process of the network management device 20 according to the third exemplary embodiment of the present invention will be described with reference to FIG. In the third embodiment, a transmission path using a dispersion value and a gain factor is determined as transmission path characteristics.

  First, the transmission path characteristic collection unit 21 receives a dispersion value and a gain factor as transmission path characteristic values from each node device (S31). Next, the transmission path characteristic correction unit 22 calculates a dispersion compensation value to be notified to each node device so as to suppress dispersion in each path from the node device 1 to the node device 7, and further, from the node device 1 to the node device. A compensation value of the gain factor notified to each node device is calculated so as to suppress the attenuation of the optical signal in the transmission up to the device 7 (S32). The dispersion compensation value and the gain factor compensation value calculated by the transmission path characteristic correction unit 22 are transmitted to each node device.

  Next, the quality measurement unit 24 receives from each node device the dispersion value in each transmission path whose dispersion value has been adjusted (S33). Next, the transmission path determination unit 25 confirms which of the dispersion value and the gain factor has higher priority (S34). For example, the priorities of the variance value and the gain factor may be stored in advance in a memory in the network management apparatus 20 or the like. When the priority of the dispersion value is high, the transmission path determination unit 25 determines a transmission path from a plurality of transmission path candidates based on the dispersion value (S35). When the priority of the gain factor is high, the transmission channel determination unit 25 determines a transmission channel based on the gain factor from among a plurality of transmission channel candidates (S36).

  As described above, by using the transmission path determination system according to the third exemplary embodiment of the present invention, it is possible to determine a transmission path from a plurality of transmission path candidates based on a plurality of transmission path characteristic values. it can. That is, by setting the priority to the transmission path characteristics used for determining the transmission path, the transmission path can be determined based on the network operation policy or the like.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the adjustment of the transmission path characteristic value may be performed in the node apparatus in each section on the transmission path as described above, or may be performed in the node apparatus at the transmission end point and the reception end point. By adjusting the transmission path characteristic value at the node equipment at the transmission end point and the reception end point, it becomes unnecessary to perform the adjustment process of the transmission path characteristic value at all the node apparatuses, thereby reducing the processing amount of the entire transmission path determination system. In addition, the cost of the transmission path determination system can be reduced.

  In the above description, the processing when a transmission line failure occurs has been described. However, the present invention can be similarly applied to trouble relocation in which a transmission line is changed in a planned manner.

1 to 7 Node equipment 11 Transmission path candidate extraction unit 12 Transmission path characteristic measurement unit 13 Transmission path characteristic value application unit 14 Communication unit 15 Transmission path application unit 20 Network management device 21 Transmission path characteristic collection unit 22 Transmission path characteristic correction unit 23 Communication Section 24 Quality measurement section 25 Transmission path determination section

Claims (9)

A transmission path determination system for determining a transmission path of an optical signal formed using a plurality of nodes,
Transmission path candidate extraction means for extracting a plurality of transmission path candidates between a node at the transmission end point of the optical signal and a node at the reception end point;
A transmission path characteristic measuring means for measuring a transmission path characteristic value in the transmission path candidate;
The transmission path characteristic correction value for each of the extracted transmission path candidates is calculated, and the calculated transmission path characteristic correction value is applied to a node forming the extracted transmission path candidates. Correction means;
Quality measuring means for measuring a transmission line characteristic value of each transmission line to which the transmission characteristic correction value is applied;
Transmission path determination for determining the transmission path of the optical signal between the transmission end point and the reception end point according to the measurement result of the transmission path characteristic value in the transmission path candidate to which each of the transmission characteristic correction values is applied. Means for determining a transmission path.   The transmission path determination system according to claim 1, wherein the transmission path characteristic value includes at least one of a dispersion value and a gain factor. The transmission path determination means includes
A priority is set for the dispersion value and the gain factor used to determine the transmission path, and the transmission endpoint and the gain factor are set according to the measurement result of the dispersion value or the gain factor for which a high priority is set. The transmission path determination system according to claim 2, wherein a transmission path of the optical signal to and from a receiving end point is determined. The quality measuring means includes
2. The transmission path characteristic value after the transmission characteristic correction value is applied is measured for a transmission path candidate whose transmission path characteristic correction value is lower than a predetermined value among the plurality of transmission path candidates. 4. The transmission line determination system according to any one of items 1 to 3. The transmission path candidate extraction means includes
5. The transmission path determination system according to claim 1, wherein when a failure occurs in the transmission path of the optical signal, the plurality of transmission path candidates that are alternative paths to the transmission path are extracted. 6. The transmission path characteristic correcting means is
The transmission path determination system according to any one of claims 1 to 5, wherein the transmission path characteristic value is applied to the node of the transmission end point and the node of the reception end point. The transmission path determination system includes a network management device that manages the plurality of nodes,
The network management device includes:
The transmission path determination system according to any one of claims 1 to 6, comprising the transmission path characteristic correction means and the transmission path determination means. A network management device used in a transmission line determination system for determining a transmission path of an optical signal formed using a plurality of nodes,
Transmission path characteristic collection means for collecting transmission path characteristic values in a plurality of transmission path candidates between a node at the transmission end point of the optical signal and a node at the reception end point;
Based on the collected transmission path characteristic value, a transmission path characteristic correction value for each of the plurality of transmission path candidates is calculated, and the calculated transmission path characteristic correction value is applied to a node forming the transmission path candidate. Transmission path characteristic correction means;
A transmission path of the optical signal between the node at the transmission end point and the node at the reception end point is determined according to the transmission path characteristic value measured in each transmission path to which the transmission path characteristic correction value is applied. A network management apparatus comprising: a transmission path determination unit; A transmission path determination method of a network management device used in a transmission path determination system that determines a transmission path of an optical signal formed using a plurality of nodes,
Collecting transmission path characteristic values in a plurality of transmission path candidates between a node at a transmission end point of the optical signal and a node at a reception end point;
Based on the collected transmission path characteristic value, calculate a transmission path characteristic correction value in each of the plurality of transmission path candidates,
Notifying the calculated transmission path characteristic correction value to a node forming the transmission path candidate,
A transmission path of the optical signal between the node at the transmission end point and the node at the reception end point is determined according to the transmission path characteristic value measured in each transmission path to which the transmission path characteristic correction value is applied. Transmission path determination method.

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