JP3634316B2 - Node and optical path network and program and recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used in an optical communication system. In particular, the present invention relates to 3R (Reshaping; Retiming; Regenerating) processing technology.
[0002]
[Prior art]
In data transfer in an IP (Internet Protocol) network, a router as a node reads header information of an IP packet and transfers the IP packet to a destination route. This is repeated between a plurality of nodes, and as a result, the IP packet reaches a desired destination. In such an IP packet transfer method, since transfer is performed in units of individual IP packets, it is necessary to read the header information of each individual IP packet.
[0003]
On the other hand, recently, the demand for a series of large-volume data transfer such as moving image data is rapidly increasing. Such a large amount of data is called burst data, and is divided into a large number of IP packets. For such burst data transfer, it is inefficient to transfer individual IP packets, so a cut-through path is set between specific nodes. In this cut-through path, the IP packet Transfer is performed at once without reading the header information. This is particularly effective for data transfer using an optical path.
[0004]
In other words, in data transfer using an optical path in a transmission path between nodes, each node temporarily converts an optical signal that has arrived through the optical path into an electric signal, reads IP packet header information, After determining the path, it is necessary to convert it into an optical signal and send it again to the optical path. On the other hand, in data transfer using a cut-through path based on a wavelength path, it is not necessary to convert an optical signal into an electrical signal in order to read header information, and the optical signal can be transferred as it is from the start point to the end point of the cut-through path. Very efficient burst data transfer can be performed.
[0005]
[Problems to be solved by the invention]
Thus, although it is an optimal cut-through path for burst data transfer using a wavelength path, the signal quality of an optical signal is degraded during transmission due to various factors. Therefore, the length of the cut-through path that enables signal transmission without performing 3R processing is necessarily limited.
[0006]
Conventionally, the location to be subjected to 3R processing has been determined by calculation. This conventional calculation for determining the 3R implementation location has two problems. First, there are various factors of signal quality degradation, and enormous data processing is required to perform calculations in consideration of these many factors. Therefore, it takes a long time to calculate. Secondly, the reliability of the results obtained by such calculation is not necessarily high, and as a practical safety measure, measures such as providing an extra 3R implementation location are necessary, and effective use of network resources is required. This is not desirable for the purpose.
[0007]
The present invention has been made in such a background, and can reduce the labor and time required for setting the 3R implementation location, can specify an accurate location, and can effectively use network resources. It is an object of the present invention to provide a node, an optical path network, a program, and a recording medium capable of achieving the above.
[0008]
In the present specification, the originating node and the terminating node are referred to as the originating node, which is a node that sends a path setting request prior to data transfer, and is the termination destination of this request. The node is called the called node. When transferring data after setting a path, either the originating node or the terminating node can be the data source or the data destination. The set path may be a unidirectional path or a bidirectional path.
[0009]
[Means for Solving the Problems]
A first aspect of the present invention is a node, and a feature of the present invention is that, prior to setting an optical path, a means for transmitting a test optical packet to a route planned to be set by the optical path, and Means for receiving a test optical packet and determining its signal quality; when this means for determining determines deterioration of signal quality; means for notifying the preceding node of the fact; And means for performing 3R processing on the optical packet passing through the path.
[0010]
In other words, in the present invention, it is not necessary to calculate at which point 3R processing needs to be performed on a path through which data is transferred as an optical signal such as a cut-through path based on a wavelength path. The time and effort required for setting can be reduced. Further, since the 3R implementation location is experimentally determined using the test optical packet, the location is accurate, and it is not necessary to provide an extra 3R implementation location, and network resources can be effectively used.
[0011]
A second aspect of the present invention is an optical path network comprising the node of the present invention.
[0012]
A third aspect of the present invention is a program, and the present invention is characterized in that an optical path is installed in the information processing apparatus as a function corresponding to the apparatus that controls the node. Prior to the setting of the optical path, the optical path transmits a test optical packet to the path scheduled to be set, the function of receiving the test optical packet and determining the signal quality, and the function of determining the signal quality When it is determined that the packet has deteriorated, a function for notifying the preceding router to that effect and a function for performing 3R processing on an optical packet passing through the path after receiving this notification are realized.
[0013]
A fourth aspect of the present invention is the information processing apparatus-readable recording medium on 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 directly installed in the information processing apparatus via a network from a server holding the program of the present invention.
[0014]
Thereby, using an information processing device such as a computer device, it is possible to reduce the labor and time required for setting the 3R implementation location, and it is possible to specify an accurate position and to effectively use network resources. It is possible to realize a node and an optical path network.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
(First Example)
A node and an optical path network according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram of the optical path network of the first embodiment. FIG. 2 is a block diagram of the node of the first embodiment.
[0016]
As shown in FIG. 1 and FIG. 2, the first embodiment includes a test optical packet sending unit 1 for sending a test optical packet to a route planned to be set by the optical path prior to the setting of the optical path, A signal quality determination unit 4 that receives a test optical packet and determines the signal quality thereof, and a deterioration notification unit 5 that notifies the preceding node of the signal quality determination unit 4 when the signal quality determination unit 4 determines deterioration of the signal quality. And a 3R trunk 3 and a 3R control unit 6 that perform 3R processing on optical packets that have passed through the path after receiving this notification.
[0017]
FIG. 1 illustrates a different block configuration for each of the nodes A to C for easy understanding, but actually, the nodes A to C have a common block configuration as shown in FIG. As shown in FIG. 1, the necessary block configuration is realized according to the role of the own node.
[0018]
The operation of the optical path network of the first embodiment will be described with reference to FIG. Prior to the setting of the optical path, the test optical packet sending unit 1 of the originating node A sends the test optical path to the route that the optical path is scheduled to set. The signal quality of the test optical packet is determined by the signal quality determination unit 4 of each node. When the signal quality determination unit 4 of the node C detects the deterioration of the signal quality, the deterioration notification unit 5 notifies the preceding node B to that effect. The 3R control unit 6 of the node B that has received the deterioration notification controls the optical cross-connect 2 to connect the path of the test optical packet to the 3R trunk 3. As a result, 3R processing is performed on the data transmitted through the route.
[0019]
A cut-through path is set on the path passing through the nodes A to C after the test by the test optical packet is completed, and burst data transfer is performed. In burst data transfer by a cut-through path, data transfer is performed between the originating node A and node B without converting the optical signal into an electrical signal. In the node B, the optical signal is once converted into an electric signal, subjected to 3R processing, and the electric signal subjected to the 3R processing is converted into an optical signal again and transmitted to the node C.
[0020]
As described above, in this embodiment, since the location where the 3R processing is experimentally performed can be specified by the test optical packet, it is easier and more reliable than specifying the location where the 3R processing is performed by calculation as in the past. Therefore, the time required for calculation can be saved.
[0021]
(Second embodiment)
A second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a diagram showing a 3R processing configuration of the second embodiment. The 3R processing configuration of the second embodiment is characterized in that 3R trunks 3-1 and 3-2 are installed at any of the output ports of the optical cross connect 2. According to this, since the path for performing the 3R processing does not loop back as in the first embodiment, the number of wavelength conversions can be reduced as compared with the configuration of the first embodiment, and signal loss and deterioration can be achieved. There is an advantage that can be kept low.
[0022]
In the first embodiment, the 3R trunk 3 occupies a specific input / output port. In the second embodiment, the output port in which the 3R trunks 3-1 and 3-2 are installed is transmitted as it is. By connecting 3R trunks 3-1 and 3-2, it is possible to avoid the decrease in the number of output ports connected to the transmission path and to effectively use the output ports. it can.
[0023]
(Third embodiment)
The node of the present embodiment can be realized using a computer device that is an information processing device. That is, when installed in a computer device, the optical path sends a test optical packet to a route that the optical path is scheduled to set prior to setting the optical path as a function corresponding to the device that controls the node. A function corresponding to the test optical packet transmitting unit 1, a function corresponding to the signal quality determining unit 4 for receiving the test optical packet and determining the signal quality, and the signal quality determining unit 4 Is determined, the function corresponding to the deterioration notifying unit 5 for notifying the preceding router to that effect, and the 3R control unit 6 for performing 3R processing on the optical packet passing through the path after receiving this notification. By installing a program for realizing the corresponding function in the computer device, the computer device controls the node of this embodiment. It can be a device corresponding to the device.
[0024]
By recording the program of the present embodiment on the recording medium of the present embodiment, the computer apparatus can install the program of the present embodiment using this recording medium. Alternatively, the program of this embodiment can be directly installed on the computer device from the server holding the program of this embodiment via the network.
[0025]
Accordingly, it is possible to reduce the time and labor required for setting the 3R implementation location using a computer device, and it is possible to specify an accurate position and to effectively use network resources. A path network can be realized.
[0026]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the labor and time required for setting the 3R implementation location, to specify an accurate location, and to effectively use network resources. .
[Brief description of the drawings]
FIG. 1 is a diagram showing an optical path network configuration according to a first embodiment.
FIG. 2 is a block configuration diagram of a node according to the first embodiment.
FIG. 3 is a diagram showing a 3R processing configuration of a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Test optical packet transmission part 2 Optical cross-connect 3, 3-1, 3-2 3R trunk 4 Signal quality determination part 5 Degradation notification part 6 3R control part AC Node

Claims (4)

Prior to the setting of the optical path, means for sending a test optical packet to the route that the optical path is to be set up;
Means for receiving the test optical packet and determining its signal quality;
When the determining means determines that the signal quality has deteriorated, means for notifying the preceding node of the fact,
A node comprising: means for performing a 3R (Reshaping; Retiming; Regenerating) process on an optical packet that has passed through the path after receiving this notification. An optical path network comprising the node according to claim 1. By installing the information processing device, the information processing device has a function corresponding to the device that controls the node.
Prior to setting an optical path, a function for sending a test optical packet to a route that the optical path is to be set, and
A function of receiving the test optical packet and determining its signal quality;
When this determination function determines that the signal quality has deteriorated, a function to notify the router in the previous stage to that effect;
A program that, when receiving this notification, realizes a function of performing 3R processing on an optical packet that passes through the path thereafter. A recording medium readable by the information processing apparatus on which the program according to claim 3 is recorded.

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