KR100742505B1 - A communication equipment of bidirectional using by unidirectional optical transmission router combined with unidirectional optical cross connector and router, and thereof method - Google Patents

Abstract

The present invention enables data processing in response to asymmetrical and symmetrical bidirectional traffic or unidirectional traffic, integrates transmission equipment and routers, and integrates layers 1 to 3 of OSI layer 7 to provide stable and economical communication. The present invention relates to a bidirectional communication system using a unidirectional optical transmission router to provide an environment, and a communication method thereof. The method comprises a plurality of unidirectional optical transmission routers and a control management unit for controlling the asymmetric bidirectional optical transmission router. It configures connection path to handle traffic and symmetric bidirectional traffic, and integrates router and WDM device.

Therefore, the present invention has the effect of reducing the construction and operation management costs due to the integration of the router and the WDM device, and recovers by switching the path related to the failed link or node by the integrated operation of the mesh network recovery technique in case of failure. By doing so, there is an effect of improving survival rate and communication quality.

Description

A communication equipment of bidirectional using by unidirectional optical transmission router combined with unidirectional optical cross connector and router, and approximately method}

1 is a functional diagram illustrating the functions of a unidirectional optical transport router incorporating a unidirectional OXC and a router according to a preferred embodiment of the present invention according to the seventh layer of OSI.

Figure 2 is a block diagram of a unidirectional optical transmission router communication apparatus according to a preferred embodiment of the present invention.

3 is a network configuration to which a bidirectional communication system using a unidirectional optical transmission router according to an embodiment of the present invention is applied.

Figure 4 is an internal blur configuration of the control management unit shown in FIG.

5 to 6 is a flowchart illustrating a bidirectional communication method using a unidirectional optical transmission router according to a preferred embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

10,30: External general device 15: Control management unit

17,18,22: one-way transmission porter 16,21: virtual two-way path porter

200: optical transmission router communication device 210: one-way OXC unit                 

212: WDM receiving unit 214: OXC combining unit

216: switch control unit 218: switch unit

220: WDM transmitter 222: OXC branch

230: router section 232: router transmission connection section

234: router receiving connection 236: output buffer

238: input buffer unit 240: packet switching processing unit

242: routing processing unit 250: external bidirectional device connection

252: OXC bidirectional connection 254: router bidirectional connection

The present invention relates to a bidirectional communication system using a unidirectional optical transmission router and a communication method thereof, and more particularly, it is possible to process unidirectional and bidirectional traffic by constituting an asymmetric / symmetric bidirectional connection path arbitrarily while performing unidirectional optical wavelength line distribution processing. A bidirectional communication system using a unidirectional optical transmission router and a communication method thereof.

Recently, according to the development of communication media, data traffic such as IP, multicast, broadcast, etc., which has asymmetric bidirectional or unidirectional characteristics, is rapidly growing, but the connection part of the existing transmission equipment or router has a symmetric bidirectional structure, which is expensive to construct. Inefficient factors such as the consumption.                         

In addition, since the equipment of the physical layer, data link layer, and network layer is manufactured separately, the cost of the connection part is higher than the integrated equipment, occupies a large area, and additional work for the connection between the devices is required. There were disadvantages such as to occur.

In addition, according to the development of new equipment, the hierarchy is divided, and the competition and collision of the recovery technique occurs according to the combination of the usage methods between the equipment, and another problem such as the independence between the layers is lowered to overcome this.

Accordingly, the present invention has been made to solve the above-mentioned problems. The present invention can process data in response to asymmetrical or symmetrical bidirectional traffic or unidirectional traffic, integrates transmission equipment and routers, It is an object of the present invention to provide a bidirectional communication system and a method of communication using a one-way optical transmission router to provide a stable and borderless communication environment by integrating layers 1 to 3 to be suitable for next-generation communication.

According to a preferred embodiment of the present invention for achieving the above object, a unidirectional optical transmission router communication system includes: a plurality of unidirectional optical transmission routers to which an external general apparatus is connected and provide a bidirectional connection path from the external general apparatus;

It is connected to the plurality of unidirectional optical transmission routers to control the bidirectional connection paths to be established using the unidirectional optical transmission routers, and monitors the failure status of each node and the link to switch the preset bidirectional connection paths in case of failure detection. Characterized in that consisting of a control management unit for controlling to be restored.

A unidirectional optical transmission router communication method according to an embodiment of the present invention for achieving the above object is a plurality of unidirectional optical transmission router that is connected to the external general apparatus, and provides a bidirectional connection path from the external general apparatus; A communication method using a bidirectional communication system using a unidirectional optical transmission router comprising a control management unit configured to manage and control the plurality of unidirectional optical transmission routers to form a bidirectional communication network;

When the asymmetric bidirectional demand data is input, the control manager extracts the state and configuration information of the current node and link, and then sets an uplink one-way path and a downlink one-way path based on the extracted information and the input asymmetric bidirectional demand data. Step 1;

A second step of completing establishment of an asymmetric bidirectional connection path if there are up and down unidirectional paths for all nodes;

Asymmetric bidirectional traffic processing is possible through the set asymmetric bidirectional connection path.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail.

FIG. 1 is a functional explanatory diagram illustrating the functions of a unidirectional optical transmission router incorporating a unidirectional optical cross connector (OXC) and a router according to the seven layers of the OSI, and the present invention provides a physical layer (based on the control of the control manager 15). 14), the lower data link layer 13, the upper data link layer 12, and the network layer 11 has all the functions.

Specifically, as the physical layer 14, the unidirectional porters 17, 18, and 22 are provided to perform an unidirectional wavelength connection and switching function to set an arbitrary asymmetric connection path, and the lower data link layer 13 is provided. By providing a virtual bidirectional path porter (16, 21) to maintain the asymmetrical connection path established in the unidirectional porter (17, 18, 22), the data link layer 13 is a general point to point protocol Is configured to operate an asymmetric or symmetric bidirectional data link, and the network layer 11 is configured to operate a general Internet Protocol (IP) or the like and to perform routing using a routing protocol.

Herein, a case in which an asymmetrical connection path is established through the one-way transmission porters 17, 18 and 22 and the virtual two-way path porters 16 and 21 will be described as an example. An arbitrary amount of one-way transmission path A is maintained up to the one-way transmission porter 22, and an arbitrary one-way porter 18 is connected to the one-way transmission porter 22 to form a connection path B ′ and an arbitrary one-way transmission porter. If at 18 the transmission unidirectional transport porter 17 maintains the same amount of unidirectional connection B as B ', then the lower data link layer 13 transmits the connection A of the reception physical layer by the control management unit 15. Connection path, asymmetric bidirectional path connection is maintained by setting connection B and B 'of the physical layer as the reception connection path.

In particular, the control management unit described in FIG. 1 is connected to a unidirectional optical transmission router communication device to handle the operation and control of the entire network, to control the failure recovery, and to operate and failback when the existing IP, ATM, SDH transmission devices are connected. To provide transparency.

2 is a block diagram of a unidirectional optical transmission router communication apparatus according to a preferred embodiment of the present invention, and the unidirectional optical transmission router communication apparatus will be described in detail with reference to the drawing.

As shown in the figure, the unidirectional optical transmission router communication apparatus 200 includes a unidirectional OXC unit 210, a router unit 230, and an external bidirectional device connection unit 250.

The unidirectional OXC unit 210 receives a plurality of unidirectional wavelength division multiplexing (WDM) signals and demultiplexes the WDM receiver 212 and the control signals from the control manager 15. A switch control unit 216 for controlling the switch unit 218 so that asymmetrical and symmetrical bidirectional connection paths and a unidirectional connection path can be established based on the control unit 216 and transmitted from the WDM receiving unit 212 under the control of the switch control unit 216. A switch unit 218 for switching a wavelength signal to be transmitted to the WDM transmitter 220, and a WDM transmitter 220 for multiplexing the wavelength transmitted from the switch unit 218 and outputting a plurality of unidirectional WDM optical signals. do.

Meanwhile, the WDM receiving unit 212 includes an OXC combining unit 214 that receives a packet signal from the router unit 230 and a wavelength signal from the OXC bidirectional connection unit 252 and transmits it to the switch unit 218. The WDM transmitter 220 includes an OXC branch unit 222 that transmits a signal of the switch unit 218 to the router receiving connection unit 234 or to an OXC bidirectional connection unit 252.                     

In addition, the router unit 230 shown in FIG. 2 includes a router receiving connection unit 234 for receiving a wavelength signal branched from the OXC branch unit 22 or a signal applied from the router bidirectional connection unit 254, and the router. An input buffer unit 238 which receives a packet from the reception connection unit 234 to perform input buffering, a packet switching processor 240 which receives a packet from the input buffer unit 238 and performs packet switching; Routing processing unit 242 for routing by operating a routing protocol for the packet output from the packet switching processing unit 240, a packet routed by the routing processing unit 242 and switched through the packet switching processing unit 240 and outputted The output buffer unit 236 that performs a buffering function for the Buffer and the packet received from the output buffer unit 236 by multiplexing the optical signal to the OXC combining unit 214 Consists of a router transmit connection 232 which transmits signals to the router bidirectional connection 254.

In addition, the external bidirectional device connection 250 shown in FIG. 1 is a general symmetrical type OXC bidirectional connection 252 for connection with a device having a general symmetrical bidirectional physical layer connection, for example, WDM signal, SDH signal processing device It consists of a router bidirectional connection 254 for connection with a router having a connection of the bidirectional physical layer.

According to the above configuration, when traffic having a symmetrical bidirectional connection structure is input to the OXC bidirectional connection unit 252, the traffic is applied to the switch unit 218 through the OXC combining unit 214 and switched, and then WDM transmission unit Transmitted to the destination 220, the destination node, the traffic input from the destination node is received through the WDM receiver 212 and then switched through the switching unit 218 and then through the OXC branch unit 222 OXC bidirectional connection 252 is sent.

Accordingly, the OXC bidirectional connection unit 252 may establish a symmetric bidirectional connection path through the unidirectional OXC unit 210.

As another example, the method for establishing an asymmetric bidirectional connection path using the unidirectional OXC unit 210 may vary the wavelength allocation to the WDM receiver 212 and the wavelength allocation to the WDM transmitter 220. By assigning a plurality of optical cores to implement an asymmetric bidirectional connection path, the asymmetric bidirectional connection path through the unidirectional OXC unit 210 is configured by combining a plurality of unidirectional optical transmission router communication system assumed in the present invention It is implemented.

Next, a bidirectional communication system using a unidirectional optical transmission router according to an embodiment of the present invention will be described with reference to the network configuration shown in FIG. 3.

As shown in the figure, the bidirectional communication system using a unidirectional optical transmission router according to an embodiment of the present invention, the external general apparatus 10, 30, the control management unit 15, and a plurality of unidirectional optical transmission routers 200a to 200e. In particular, the unidirectional optical transmission routers 200a to 200e are connected and configured using one or more optical cables, and the control management unit 15 controls and manages the entire communication network.

Here, the external general apparatus 10, 30 is a router (10a, 30a), ATM (Asynchronous Transfer Method; ATM) 10b, 30b device, SDH (Synchronous Digital Hierachy) transmission device (10c, 30c), etc. The external general apparatuses 10 and 30 described above are connected to the unidirectional optical transmission routers 200a and 200c through an external bidirectional device connection unit 250 configured in the unidirectional optical transmission routers 200a and 200c.

For reference, the routers 10a and 30a perform flow control, configure various sub-networks within an internetwork, perform various network management functions, and have a path automatically determined by an internal algorithm. The ATMs 10b and 30b generate and transmit data to an ATM cell and process them asynchronously, store them in a queue for multiplexing for circuit sharing, and have a high data processing speed. 10c and 30c transmit and receive data between stations, and transmit synchronous data on an optical medium.

Meanwhile, as shown in FIG. 4, the control manager 15 provides an input / output unit 102 for inputting and outputting input data through the user's monitor 80 and a keyboard, and to provide bidirectional directions using a unidirectional connection. Connection control unit 104 to manage and control, the switching control unit 106 to maintain and manage the virtual or actual switching path according to the failure switching technique of the external symmetrical bidirectional equipment, and to restore management according to the internal mesh network recovery technique, network performance And network performance management unit 108 to manage the network performance in accordance with the quality management policy.

Hereinafter, an operation of the unidirectional optical transmission router communication system described above with reference to the flowcharts shown in FIGS. 5 to 6 will be described in detail.

First, a process of establishing an asymmetric bidirectional path through the unidirectional optical transmission routers 200a to 200e will be described with reference to the flowchart shown in FIG. 5.                     

When the asymmetric bidirectional demand data is input through the input / output unit 102 of the control manager 15 (S2), the connection controller 104 is configured and the current state and configuration of the current node and link from the network performance manager 108 After extracting the information (S4), based on the extracted information, the upward unidirectional path is set (S6) and the downward unidirectional path is set (S8). In this case, the connection controller 104 may allocate the wavelength allocation for the unidirectional optical transmission routers configured as the uplink unidirectional path and the wavelength allocation or the optical core for unidirectional optical transmission routers configured as the downlink unidirectional path based on the asymmetric bidirectional demand data. By varying the number, asymmetric bidirectional traffic can be transmitted smoothly.

Then, the connection control unit 104 determines whether there is an up and down one-way path for the demand of all node pairs (S10), if there is an up and down one-way path for all node pairs (YES in S10) If the sequence according to the asymmetric bidirectional routing assumed in the present invention is terminated, and there is a node pair for which the uplink and the downlink one-way paths are not determined as a result of the determination in step S10 (NO in S10), the process proceeds to step S6. The process is then repeated.

The path setting applied in the above-described process uses various optimization techniques such as the existing shortest path setting method.

Next, a failure switching process for each unidirectional path when a failure occurs will be described with reference to the flowchart shown in FIG. 6.

When failure procedure information such as the type and size of the failure generated in the link or the node is reported from the network performance management unit 108 of the control management unit 15 (S20), the transfer control unit 106 is the network performance management unit 108 Extracts the current node and link configuration information from the current node and link configuration (S22), and alternates and recovers the uplink one-way path associated with the failed node or the failed link based on the extracted information (S24). The related down unidirectional path is transferred and restored (S26).

Subsequently, the transfer control unit 106 determines whether both the uplink and the downlink one-way paths associated with the failed node or the failed link are transferred (S28), and then all of them are switched to recover the uplink and downlink one-way paths associated with the failed node or the failed link. If it is determined (YES in S28) that the failure switching process for each unidirectional path when the failure occurs, if the completion of the fault path switching is not determined as a result of the determination in S28 (NO in S28), the process proceeds to step S24 described above. The process of is performed sequentially.

The transfer path selection method applied in the above-described process uses various optimal recovery switching techniques such as the existing shortest path setting method.

On the other hand, the control manager 15 follows a recovery time setting diagram as shown in FIG. 7 in order to improve the survival rate of the multi-layer and avoid the impulse of the multi-layer transfer method, according to the recovery time setting diagram, The maximum recovery time 310a of the layer should be smaller than the minimum recovery time 300b of the data link layer, and the maximum recovery time 310b of the data link layer should be smaller than the minimum recovery time 300c of the network layer. It is applied to mesh network recovery and interlocking with existing symmetrical bidirectional connection equipment.

According to the present invention as described above, the routing by the unidirectional optical transmission router and the control management unit for controlling the same is advantageous for the transmission of asymmetric traffic such as Internet traffic and unidirectional traffic such as multicast and broadcast. There is an advantage of providing transparency.

In addition, the unidirectional optical transmission router according to the present invention is a structure in which the router and the WDM device are integrated to reduce the construction and operation management costs, and improve the survival rate and the communication quality through the integrated operation of the existing switching method and the mesh network recovery method. There is an advantage to improve.

On the other hand, the present invention is not limited to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, such modifications and changes should be regarded as belonging to the following claims. will be.

Claims (10)

A plurality of unidirectional optical transmission routers to which an external general apparatus is connected and which provides a bidirectional connection path from the external general apparatus; It is connected to the plurality of unidirectional optical transmission routers to control the bidirectional connection paths to be established using the unidirectional optical transmission routers, and monitors the failure status of each node and the link to switch the preset bidirectional connection paths in case of failure detection, thereby recovering resources. Bidirectional communication system using a one-way optical transmission router, characterized in that configured to control to control to control. The method of claim 1, The unidirectional optical transmission router is a unidirectional OXC unit for receiving a WDM signal to enable bi-directional data transmission under the control of the control management unit, an external bidirectional device connection unit for connecting a WDM signal processing device and a bidirectional router, and the unidirectional OXC. And a router unit for routing a predetermined signal applied from the external bidirectional device connection unit and multiplexing the packet according to the optical signal and transmitting the multiplexed packet to the unidirectional OXC unit and the external bidirectional device connection unit. Bidirectional communication system using. The method according to claim 1 or 2, A WDM receiver which receives a plurality of WDM signals and receives a wavelength signal of the external bidirectional device connection unit through an OXC coupling unit configured therein, and performs a switching operation on a signal transmitted from the receiver under the control of the control manager. And a WDM transmitter which transmits a signal transmitted from the switch means as a plurality of unidirectional WDM signals, and transmits a predetermined wavelength signal to the external bidirectional device connection unit and the router unit through an internally configured OXC branching unit. Bidirectional communication system using a one-way optical transmission router. The method of claim 3, wherein The control manager may perform asymmetric bidirectional traffic processing by varying the wavelength allocation number or optical core number of the WDM receiving unit and the wavelength allocation number or optical core number of the WDM transmitting unit. system. The method of claim 1, The control management unit inputs command data and outputs a result thereof, a connection control unit controlling the unidirectional optical transmission router to provide a bidirectional connection using a unidirectional connection, and a preset bidirectional at the time of fault detection of an external symmetric bidirectional device. 2. A bidirectional communication system using a unidirectional optical transmission router, comprising: a switching control unit for restoring a resource by switching a path; and a network performance management unit for detecting a failure state by managing network performance and reporting the detection result to the switching control unit. The method of claim 5, The connection control unit is a bidirectional communication system using a unidirectional optical transmission router, characterized in that to provide a bidirectional using a unidirectional connection by performing the functions of the physical layer, the upper / lower data link layer, the network layer. The method of claim 5, The switching controller sets the maximum recovery time of the physical layer to be smaller than the minimum recovery time of the upper / lower data link layer, and sets the maximum recovery time of the upper / lower data link layer to be smaller than the minimum recovery time of the network layer. Bidirectional communication system using a one-way optical transmission router. A plurality of unidirectional optical transmission routers to which an external general apparatus is connected and which provides a bidirectional connection path from the external general apparatus; A communication method using a bidirectional communication system using a unidirectional optical transmission router comprising a control management unit configured to manage and control the plurality of unidirectional optical transmission routers to form a bidirectional communication network; When the asymmetric bidirectional demand data is input, the control manager extracts the state and configuration information of the current node and link, and then sets an uplink one-way path and a downlink one-way path based on the extracted information and the input asymmetric bidirectional demand data. Step 1; A second step of completing establishment of an asymmetric bidirectional connection path if there are up and down unidirectional paths for all nodes; Bidirectional communication method using a unidirectional optical transmission router, characterized in that the asymmetric bidirectional traffic processing through the set asymmetric bidirectional connection path A plurality of unidirectional optical transmission routers to which an external general apparatus is connected and which provides a bidirectional connection path from the external general apparatus; A communication method using a bidirectional communication system using a unidirectional optical transmission router comprising a control management unit configured to manage and control the plurality of unidirectional optical transmission routers to form a bidirectional communication network; (a) transmitting symmetrical bidirectional traffic input from the external general apparatus to the unidirectional optical transmission router through an external bidirectional device connection configured in the unidirectional optical transmission router; (b) the unidirectional optical transport router transmitting the symmetric bidirectional traffic to a destination node; and (c) the unidirectional optical transmission router transmitting the symmetric bidirectional traffic received from the destination node to the external bidirectional device connection to enable symmetric bidirectional traffic processing. . A plurality of unidirectional optical transmission routers to which an external general apparatus is connected and which provides a bidirectional connection path from the external general apparatus; A communication method using a bidirectional communication system using a unidirectional optical transmission router comprising a control management unit configured to manage and control the plurality of unidirectional optical transmission routers to form a bidirectional communication network; When the failure state is detected in the link or node, the control manager extracts the current node and link configuration information, and transfers and recovers the uplink one-way path associated with the failed link or node based on the extracted information. A first step of restoring the unidirectional path; If it is determined that both the uplink and the downlink one-way paths related to the failed link or node have been restored, the second step of completing a failure procedure; The maximum recovery time of the physical layer is set smaller than the minimum recovery time of the data link layer during the path recovery, and the maximum recovery time of the data link layer is set smaller than the minimum recovery time of the network layer, thereby improving the survival rate of the multi-layer. A two-way communication method using a one-way optical transmission router, characterized in that to avoid collision of the switching technique of the layer.

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