KR20180042100A - A control apparatus and method for packet based optical signal switching - Google Patents

Abstract

The present invention relates to an apparatus to control a packet-type optical signal switch and a method thereof. According to the present invention, the method to control an optical switching may comprise: a step of generating an optical switch path by corresponding to a destination node of a service traffic introduced from an external service network; a step of generating an optical frame corresponding to the generated optical switch path; a step of transmitting a request message to a control server in order to receive a time slot to transmit the generated optical frame; a step of receiving an approval message as a result of approval for the transmitted request message to generate an optical signal having a specific wavelength to transmit the optical frame; and a step of transmitting the optical frame to the destination node in accordance with the optical switch path by using the generated optical frame. The present invention provides an apparatus and method for generating an optical signal for each destination of an optical signal network and controlling an optical signal switching path to transfer data traffic to a destination by using a technology to change an optical switch path in accordance with a change in the wavelength of an optical signal and an input/output port of the optical signal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a packet-

The present invention relates to an apparatus and method for controlling a packet-type optical signal switch, and more particularly, to a method and apparatus for controlling a packet-type optical signal switch by converting data traffic arriving at an inlet of an optical signal network into an optical signal suitable for the optical signal network, To an apparatus and method for generating an optical signal for each destination of an optical signal network and controlling an optical signal switching path so that data traffic can be transmitted to a destination using a technique of changing an optical switch path according to a change of input / output ports of a signal.

Recent developments in data communication, such as OTN (Optical Transport Network), SDH (Synchronous Optical Networking), SONET (Synchronous Optical Network), packet technology Ethernet, Multi-Protocol Label Switching (MPLS) And the capacity of the network is increasing rapidly.

However, the transmission of signals using an electrical switch is approaching the limit in an optical network in which high capacity is being rapidly increased. Accordingly, there is a growing need for an optical network that directly transmits an optical signal generated at a source node of an optical network to a destination node without converting it into electricity.

The present invention relates to a method and a device for converting data traffic arriving at an inlet of an optical signal network into an optical signal suitable for an optical signal network and using a technique of changing a wavelength of the optical signal and an optical switch path, The present invention provides an apparatus and method for generating an optical signal for each destination of an optical signal network and controlling an optical signal switching path so that the optical signal can be transmitted to a destination.

An optical switching control method performed by a data plane of a packet optical signal network according to an embodiment of the present invention includes generating an optical switch path corresponding to a destination node of service traffic flowing from an external service network; Generating an optical frame corresponding to the generated optical switch path; Transmitting a request message to each ingress node to a control server in order to allocate a time slot and an optical switch path including a destination input port of an optical signal for transmitting the generated optical frame; Receiving an acknowledgment message as a result of the acknowledgment of the transmitted request message and generating an optical signal having a specific wavelength for transmitting the optical frame; Setting an optical switch path for optical signal transmission by designating an input / output port and a switching port for transmitting and switching the optical frame using the generated optical signal; And transmitting the optical frame to the destination node according to the allocated time slot and the optical switch path.

The step of transmitting the optical frame may use an arrayed waveguide grating routing (AWGR) that changes the optical switch path according to the wavelength of the optical signal.

Wherein the step of transmitting the request message includes the steps of: using the optical switch path and receiving a request message for time slot allocation from another ingress node during transmission of a request message for time slot allocation, Can be transmitted sequentially.

The request message for the optical switch path and the time slot allocation includes an ID of a requested time slot, a destination node ID and an optical switch path ID, a congestion state of a service port and an optical switch path, The incoming ingress node information and the destination-specific VOQ information of the ingress node that transmitted the request message.

The optical signal switching control method performed by the control server of the packet-type optical signal switching network according to an embodiment of the present invention is a method for controlling the use of a corresponding optical switch path from a control client of an ingress node, ≪ / RTI > Determining a specific optical switch path to be allocated to a specific time slot by performing a scheduling function based on the received request message; And forwarding an acknowledgment message to the control client of the ingress node as a result of the approval of the received request message.

The request message for the optical switch path and the time slot allocation includes an ID of a requested time slot, a destination node ID and an optical switch path ID, a congestion state of a service port and an optical switch path, The incoming ingress node information and the destination-specific VOQ information of the ingress node that transmitted the request message.

The step of receiving the request message may group and process request messages received from a plurality of incoming nodes.

An optical signal switching apparatus according to an embodiment of the present invention includes a data plane for transmitting service traffic to an ingress node of a packet-type optical network to a destination node using an optical signal; And a control server for controlling optical switching in a plurality of optical switch paths existing between the ingress node of the data plane and the optical signal destination node.

An optical frame transmitter for managing an optical switch path corresponding to a destination node of the service traffic and generating an optical frame corresponding to the optical switch path; A variable optical transmitter for generating an optical signal having a specific wavelength to transmit the generated optical frame to the destination node; An arrayed waveguide grating routing (AWGR) for transmitting the optical signal having the specific wavelength to the destination node; An optical receiver for receiving the optical signal having the specific wavelength and converting the optical signal into an electrical signal; And an optical frame receiver for extracting the service traffic from the optical frame included in the received optical signal.

The optical switch path may include an optical signal transmission from the ingress node to a destination node and information about an input / output port of the switching device, a time slot through which the optical signal is transmitted, and a wavelength of the optical signal.

The control server receives a request message for use of the optical switch path and time slot allocation from a control client of the ingress node and transmits an acknowledgment message to the ingress node as a result of the approval of the received request message A control interface manager for delivering the control message to the control client; And a scheduler for determining a specific optical switch path to be allocated to a specific time slot by performing a scheduling function based on the use of the corresponding optical switch path received by the control interface management unit and a request message for time slot allocation.

When the control client of the ingress node receives the request message from another ingress node while transmitting the request message for the use of the optical switch path and the time slot allocation, the control client can sequentially transmit the request message using the delay logic of the shift register.

The request message for time slot allocation includes an ID of a requested time slot, a destination node ID and an optical switch path ID, a congestion state of a service port and an optical switch path, And the destination-specific VOQ information of the ingress node that transmitted the information and request message.

According to an embodiment of the present invention, data traffic arriving at an inlet of an optical signal network is converted into an optical signal suitable for the optical signal network, and the wavelength of the optical signal and the change of the optical switch path It is possible to generate an optical signal for each destination of the optical signal network and control the optical signal switching path so that the data traffic can be transmitted to the destination using the technique.

According to an embodiment of the present invention, it is possible to reduce data transmission delay in the network and reduce electric energy consumption through a control technique that enables optical switching between an incoming node and a destination node without converting an optical signal into an electrical signal.

1 is a conceptual diagram of a packet-type optical signal network according to an embodiment of the present invention.
2 is a diagram showing a table shape in which an optical switch path is configured and managed according to wavelength and time slot for each optical signal input / output port of an ingress node and a destination node according to an embodiment of the present invention.
3 is a diagram illustrating a shape in which an optical frame corresponding to each optical switch path has a specific wavelength and is transmitted to a destination node through a data plane during a specific time slot according to an embodiment of the present invention.
4 is a diagram illustrating an example in which each optical frame according to an embodiment of the present invention transmits Ethernet frames as service traffic during one time slot.
FIG. 5 is a diagram illustrating an example in which each optical frame according to an embodiment of the present invention delivers Ethernet frames to service traffic during two or more time slots.
FIG. 6 illustrates time slot-based time information to be managed for requesting and acknowledging time slots, optical signals, or optical frame transmissions in each network node according to an embodiment of the present invention.
FIG. 7 is a time diagram of control rules according to an embodiment of the present invention. Referring to FIG.
8 is a diagram illustrating an example of an upstream control network for transmitting a request message according to an embodiment of the present invention.
9 is a diagram illustrating a detailed operation of a message multiplexing unit according to an embodiment of the present invention.
10 is a diagram illustrating another example of an upstream control network for transmitting a request message according to an embodiment of the present invention.
FIG. 11 is a diagram illustrating a physical configuration of a downstream control network of a control interface for a packet-type optical signal network according to an embodiment of the present invention.
12 is a diagram illustrating an example of a request message using an Ethernet frame according to an embodiment of the present invention.
13 is a diagram illustrating an example of an approval message per group using an Ethernet frame according to an embodiment of the present invention.

It is to be understood that the specific structural or functional descriptions of embodiments of the present invention disclosed herein are presented for the purpose of describing embodiments only in accordance with the concepts of the present invention, May be embodied in various forms and are not limited to the embodiments described herein.

Embodiments in accordance with the concepts of the present invention are capable of various modifications and may take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. However, it is not intended to limit the embodiments according to the concepts of the present invention to the specific disclosure forms, but includes changes, equivalents, or alternatives falling within the spirit and scope of the present invention.

The terms first, second, or the like may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example without departing from the scope of the right according to the concept of the present invention, the first element being referred to as the second element, Similarly, the second component may also be referred to as the first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Expressions that describe the relationship between components, for example, "between" and "immediately" or "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", and the like, are used to specify one or more of the features, numbers, steps, operations, elements, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these embodiments. Like reference symbols in the drawings denote like elements.

1 is a conceptual diagram of a packet-type optical signal network according to an embodiment of the present invention.

The optical signal network 100 uses the input / output port of the optical device and the change technology of the optical switch path (PSP) according to the wavelength of the optical signal to transmit the service traffic, which has flowed from the external service network to the ingress node 210, To the destination node. At this time, the optical signal network 100 includes a data plane 200 for transmitting service traffic to a destination node 220 via an optical switch path, a control server 300 for controlling the change of the optical switch path, And a control client 214 distributed to the ingress node 210 and the destination node 220.

First, the data plane 200 includes all the optical elements included in the path through which the service traffic is input / output in the optical signal network 100, and the service traffic is output from the input port of the ingress node 210 to which the service traffic is input The entire physical path through which the service traffic can be transmitted to the output port of the destination node 220. [

The data plane 200 includes a plurality of ingress nodes 210, a plurality of destination nodes 220 and an array 220 that is located between the ingress node 210 and the destination node 220 and changes the optical switch path according to the wavelength of the optical signal. And an Arrayed Waveguide Granting Routing (AWGR) 230. A plurality of optical switch paths may exist between the plurality of ingress nodes 210 and the destination node 220 and each optical switch path may include all physical optical elements 220 existing from the ingress node 210 to the destination node 220. [ Output ports for optical signals, time slots through which optical signals are transmitted, and property information on wavelengths of optical signals.

Specifically, each of the plurality of ingress nodes 210 may include an optical frame transmitter 211, a variable optical transmitter 212, and an optical path switch 213. The optical frame transmitter 211 can determine the optical switch path that is the optical signal transmission path on the data plane 200 through the control of the present invention to the service traffic flowing through the external service network. The optical frame transmitting unit 211 may generate a photonic frame (PF) corresponding to each optical switch path and store the optical frame in a virtual output queue (VOQ), which is a memory for storing optical frames. At this time, the VOQ can store the optical frames generated by the optical switch paths for the same destination separately.

The optical tunable transmitter 212 may generate an optical signal having a specific wavelength for each time slot and input / output port of the optical devices to transmit the optical frame stored in the VOQ for each optical switch path for the same destination. That is, a specific optical frame generated corresponding to a specific optical switch path can be transmitted to a destination node 220 which is a destination during a specific time slot through an optical signal having a specific wavelength. The optical tunable transmitter 212 may then transmit the generated optical signal having the specific wavelength to the optical path switch 213 located at the rear end of the ingress node 210.

The optical path switch 213 may switch the optical signal received by the optical variable transmitter 212 to an output port designated according to an optical switch path corresponding to the optical signal during a time slot corresponding to the optical signal.

The arrayed optical waveguide grating routing 230 can transmit the optical signal received through the optical path switch 213 to an optically determined output port according to the wavelength. That is, the array optical waveguide grating routing 230 can preset the output port according to the wavelength of the received optical signal.

Each of the plurality of destination nodes 220 may include an optical receiver 221 and a light frame receiver 222. First, the optical receiver 221 may convert an optical signal received through the optical waveguide grating routing 230 into an electrical signal and transmit the electrical signal to the optical frame receiver 222.

The optical frame receiver 222 extracts the service traffic suitable for the external service network from the optical frame of the optical signal converted into the electrical signal through the optical receiver 221 and delivers the extracted service traffic to the interface of the corresponding external service network .

The optical frame transmitter 211, the optical variable transmitter 212, the optical path switch 213, the optical receiver 221, and the optical frame receiver 222 are parts and devices that require electrical control. At this time, the optical frame transmitter 211, the optical variable transmitter 212, and the optical path switch 213 are mounted on the ingress node 210. The optical receiver 221 and the optical frame receiver 222 are connected to the destination node 220, But the arrangement of the optical path switch 213 and the arrayed optical waveguide grating routing 230 may be changed in the order of arrangement and overlapping for various optical switching path configurations. It is possible to configure various shapes.

Each of a plurality of incoming nodes 210 and destination nodes 220 included in a data plane 200 of an optical signal network 100 according to an embodiment of the present invention includes a plurality of optical variable transmitters 212 And a plurality of optical receivers 221. Thus, each of the plurality of ingress nodes 210 and the destination nodes 220 may be connected to the external service network or the ToR switch through a plurality of Ethernet ports at a service ingress / egress point.

In this case, the network component of the external service network may be any type of network component having a communication function such as a server, a storage device, a processor, etc., rather than a ToR switch, and a plurality of incoming nodes 210 and a destination node 220 may have a plurality of physical ports at a service entry / exit point as required.

If each of the plurality of ingress nodes 210 and the plurality of destination nodes 220 is connected by a plurality of optical variable transmitters 212 and a plurality of optical receivers 221, The ingress node 210 is capable of communicating at an increased bandwidth by transmitting optical signals to multiple destination nodes 220 at the same time.

The data plane 200 of the optical signal network 100 according to an embodiment of the present invention may include a total of N network nodes configured by a combination of an ingress node 210 and a destination node 220, Network nodes can be managed and controlled in a synchronized manner.

The control server 300 may then provide a control signal to change the optical switch path for the optical signal transmitted over the data plane 200. [ Specifically, the control server 300 may include a control interface management unit 310 and a frame scheduler 320. First, in the VOQ of the ingress node 210, optical frames generated for each optical switch path for the same destination are stored in units of time slots. At this time, the control client 214 included in the ingress node 210 transmits an optical switching path and a time slot allocation for the corresponding optical frame to the destination node 220, which is a destination, To the control-interface management unit 310 in the control server 300. The control-

The control interface management unit 310 forms an optical switch path management table for each time slot of the optical signal network 100 based on the request message received from the control client 214 included in the plurality of ingress nodes 210, Allowing the scheduler 320 to begin scheduling for the requests of the control clients 210.

The frame scheduler 320 schedules a valid request of the optical switch management table for each type slot by using the request messages received through the control interface management unit 310, It is possible to control the transmission of the frame.

2 is a diagram showing a table shape in which an optical switch path is configured and managed according to wavelength and time slot for each optical signal input / output port of an ingress node and a destination node according to an embodiment of the present invention.

The destination node 220, which is the destination of the optical signal network 100, is operated on a time slot basis, and each destination node 220 can receive an optical signal having a predetermined wavelength in a specific time slot. Therefore, a network node having a structure in which optical signals are transmitted and received through a plurality of optical switch paths to one physical input / output port must accurately manage time slots for transmitting and receiving optical signals. In other words, since each network node manages VOQs according to destinations, optical frames stored in specific VOQs can be transmitted according to the corresponding optical switch paths through specific timeslots. As shown in FIG. 2, It can be seen that the nodes 1 to n are assigned optical switch paths corresponding to optical signals having a predetermined wavelength during a specific time slot.

For example, the Node 1 of FIG. 2 may include a plurality of transmission ports (or reception ports). Specifically, the transmission port 1 allocates an optical switch path corresponding to a PSD ID (1) to an optical signal having a wavelength of? 1 during a specific time slot TS (1) It can be seen that the optical switch path corresponding to the PSD ID (2) is allocated to the optical signal having the wavelength.

At this time, as can be seen from the optical switch management table of FIG. 2, for each transmission port (or reception port), an optical switch path for an optical signal having a specific wavelength is allocated during one time slot, The optical switch paths for optical signals having wavelengths are not overlapped and assigned.

3 is a diagram illustrating a shape in which an optical frame corresponding to each optical switch path has a specific wavelength and is transmitted to a destination node through a data plane during a specific time slot according to an embodiment of the present invention.

Also in FIG. 3, the network node of the optical signal network 100 knows that an optical frame is transmitted along an optical switch path corresponding to an optical signal having a predetermined wavelength in a specific time slot.

As can be seen from FIG. 3, for each transmission port (or reception port), an optical frame for an optical signal having a specific wavelength is allocated during one time slot only for an optical signal having a wavelength other than the specific wavelength Optical frames are not redundantly assigned.

4 is a diagram illustrating an example in which each optical frame according to an embodiment of the present invention transmits Ethernet frames as service traffic during one time slot.

One time slot may be composed of an optical switch section OTSi and an electrical processing section ETSi. At this time, each optical switch section and the electrical processing section may be calculated as a multiple of the minimum management time information ti. The optical switch interval is the time that can not be used for data transmission. It is the normal generation time of optical signal during optical switching. Optical rising edge time (OTSre) of optical signal rising edge, optical falling time of optical signal falling edge time edge time (OTfe), and distance difference compensation interval (OTg) of the optical switch path.

The electric processing section is an interval used for actual data transmission and can electrically determine bit 0 and bit 1. Specifically, the electrical processing section includes a payload time (ETSPi), a preamble, and an optical frame header (ETSHi) for transmitting an optical frame. The optical frame header may be composed of an OTSre and a preamble. If necessary, optical frame control and attribute information may be included, and in-band signaling for control between the respective network nodes is possible.

FIG. 5 is a diagram illustrating an example in which each optical frame according to an embodiment of the present invention delivers Ethernet frames to service traffic during two or more time slots.

When two or more timeslots are consecutively acknowledged for one optical switch path, an optical frame delivered to one destination can be transmitted by filling a payload in an optical header without optical switching for each time slot. Accordingly, the ingress node 210 of the optical signal network 100 can transmit the optical frame with a variable length. The OTS and ETSH for a second or more timeslots are not needed when transmitting based on consecutive wavelengths and can be used for actual data transmission. That is, if two or more time slots are consecutively acknowledged for one optical switch path, time slots other than the first time slot may be filled with PF payload (ETSP) which is a payload.

The minimum transmission unit of an optical frame transmitted by each network node may be sent during any time slot. At this time, OTS should be considered, and service traffic that is valid during OTS can not be transmitted.

The number of time slots managed by one ingress node 210 or the destination node 220 is N-1 (when each node does not transmit its own node) or N (when each node is its own node) Node) is more than.

If there is only one input / output port in one node without transmitting to its own node, N * (N-1) optical switch paths may exist in the packet-type optical signal network 100. At this time, if there are A input / output ports in one node, A * N (N-1) optical switch paths may exist in the packet type optical signal network 100.

FIG. 6 illustrates time slot-based time information to be managed for requesting and acknowledging time slots, optical signals, or optical frame transmissions in each network node according to an embodiment of the present invention.

N Scheduling Clients to be scheduled according to an embodiment of the present invention may be classified into a Network Management Period (NMP), a Scalable Time Slot (STS), a Single Time Slot (TSi) Time information can be managed. A single time slot is assigned to the physical time associated with the clock unit and is used to transmit and manage the optical frames for each VOQ of each optical switch path.

The extended time slot is limited by the VOQ maximum storage capacity of each optical switch path, and may be an integer multiple of the time slot (= m * TS, m > 1). As the number of timeslots constituting a single extended time slot increases, the number of all managed network nodes may be reduced proportionally.

The network management period represents the number of network nodes in the packet optical signal network and the time information associated with the time slot and the scheduling period associated with optical frame (PF) control on the optical signal network. The network management period is managed as a positive integer multiple of the time slot. If the switching is 360X360, 180X180, 90X90 structure with respect to the size of the switch related to the number of input / output network nodes, each input / And may have a cycle of 90 time slots.

An optical switch path table for all network nodes in a packet-type optical signal network is managed by a control server. Also, the optical switch path table attribute corresponding to each network node can be statically set through the control channel, and the optical switch path table for each network node can be managed in each network node. Each optical switch path can be managed in association with the VOQ. In the packet optical signaling network, the optical switch path in the control server and each network node includes the attributes of the optical switch path according to the physical network configuration, Lt; / RTI >

FIG. 7 is a time diagram of control rules according to an embodiment of the present invention. Referring to FIG.

When statistical multiplexing of an optical signal or an optical frame in a packet-type optical signal network 100 and contention for transmission to each of the ingress nodes 210 to the same destination node 220 occurs, dynamic Scheduling for transmission can be performed by the following control rules. If there is an optical frame to be transmitted from the optical frame transmission unit 211 of each network node constituting the optical signal network 100, a control client 214 included in each ingress node 210 transmits a control frame to the control server 300 to transmit a request message for use of the optical switch path and time slot allocation.

The control server 300 performs a scheduling function of the optical frame scheduler 320 on the basis of the request message received from each ingress node 210 so that an optical signal having one wavelength in one time slot is input / The optical switch path used can be determined so that it is transmitted through the port.

The control server 300 transmits an acknowledgment message (Grant) to all the ingress nodes 210 in order to apply the optical frame transmission of the determined specific optical switch path, and the ingress node 210, which has transmitted the request message, And to make sure that the

Each ingress node 210 may transmit an optical frame by using a specific wavelength during a specific time slot using a specific optical signal input / output port of the data plane 200 according to the optical switch path determined through the grant message.

Specifically, when the control rule is checked in terms of time, a request message transmission time (Request Time), a scheduling processing time (Scheduling Time) in the control server (300), an acknowledgment message delivery time (Round Trip Time) including the Grant Time.

The control client 214 transmits a request message containing the VOQ information of the ingress node 210 to the control server 300 at the start point of each time slot and when receiving the acknowledgment message for each time slot, The authorized ingress node 210 may transmit an optical frame in the time slot.

At this time, the round trip time of the control rule may be variable according to the structure of the optical signal network 100. In other words, the time slot of the time slot can be managed even when the time slot is shorter than the round trip time (Time Slot Case 1), and can be managed even when the time slot is longer than the round trip time (Time Slot Case 2).

In the case of Time Slot Case 2, the ingress node 210 receiving the grant message can transmit the optical frame during the next time slot. On the other hand, in case of Time Slot Case 1, the ingress node 210 having the approval message should have the time slot information to be notified to each ingress node 210 in the approval message, Frame can be transmitted. At this time, information for approving multiple time slots in one acknowledgment message may be included.

8 is a diagram illustrating an example of an upstream control network for transmitting a request message according to an embodiment of the present invention.

The control interface management unit 310 of the control server 300 collects a request message generated in the plurality of ingress nodes 210 existing in the packet type optical network 100 and the optical frame scheduler 320 performs effective scheduling And can be shared and transmitted. The control interface management unit 310 provides a control protocol frame processing function for rapidly transferring the approval result of the scheduling completed by the optical frame scheduler 320 to each of the plurality of ingress nodes 210 through the grant message. At this time, the control interface manager 310 processes the received plurality of request messages to form a timeslot allocation request table for the optical switch path, and transmits the scheduling start time to the optical frame scheduler 320.

The control interface management unit 310 groups all the ingress nodes 210 into a plurality of groups (or zones) for efficient processing, reduces transmission time for request and acknowledge messages for the plurality of ingress nodes 210, By setting the request message and the approval message to the corresponding group (or zone), each message is transmitted and received for each group.

The formation of such a group may form a group of network nodes depending on the physical shape of the optical signal network 100 and logically form a group of network nodes for management efficiency. The physical configuration may define a plurality of network nodes or control clients 214 connected to one port of the control server 300 as a group.

For example, FIG. 8 shows an example in which a total of eight groups are managed by managing 45 network nodes as one group when 360 network nodes exist.

Each of the network nodes (or control clients) having an input port and an output port for requesting messages transmits a request message to a server direction output port, The request message is forwarded to the server direction output port.

That is, in the control client 214 of each network node, the message multiplexing unit can transmit its own local request message at a predetermined time of the corresponding time slot, and can transmit a request message of another received network node Message) can be sent upward without collision.

9 is a diagram illustrating a detailed operation of a message multiplexing unit according to an embodiment of the present invention.

First, the control client 214 included in the network node operates in a default mode as shown in FIG. 9A, and transmits a request message to the control client 214 at the request time (Trigger) of the synchronization logic (Logic) (Local) request message.

9 (b), when a Transit request message is received from another network node while the local request message is being transmitted, the control client 214 generates a delay logic by a shift register or other physical logic And can be sequentially transmitted.

That is, when the control client 214 receives a Transit request message from another network node while transmitting its Local Request message, it transmits a Local Request message through a multiplexer and performs a switch operation for a Transit request message It is possible to sequentially transmit a Transit request message as shown in (c) of FIG.

At this time, if there is no collision between the Local request message and the Transit request message, the control client 214 does not operate the delay logic, thereby increasing the transmission speed of the in-group request message.

In addition, for the fault management of the uplink control network, various types of ring protection switching methods that physically connect and logically block the link between the lower-level network nodes of the group or bypass the faulty node by using a physical bypass link May be used to perform a protection switchover to the fault.

10 is a diagram illustrating another example of an upstream control network for transmitting a request message according to an embodiment of the present invention.

For example, as shown in FIG. 9, when there are 360 network nodes, 45 network nodes are managed as one group, and a total of 8 groups can be managed.

In the uplink control network, one output port included in each network node (or control client) of each group is connected through a multiplexer having a plurality of input ports and one output port in the server direction, And may be transmitted to the control server 300 by multiplexing. The basic principle of the multiplexing unit may be the same as that of the multiplexing unit of FIG. At this time, a storage memory of sufficient size to temporarily store a plurality of messages is required as the number of input ports increases, and message transmission to the output port can be performed without collision by delay logic. At this time, the multiplexer according to FIG. 11 may use a switch.

FIG. 11 is a diagram illustrating a physical configuration of a downstream control network of a control interface for a packet-type optical signal network according to an embodiment of the present invention.

For example, when there are 360 network nodes as shown in FIG. 11, 45 network nodes are managed as one group, and a total of 8 groups can be managed.

An optical splitter for providing an optical signal branch between the control server 300 and the control client 214 is used and the grant message transmitted from the control server 300 is transmitted to all control clients (214) with the same control signal.

12 is a diagram illustrating an example of a request message using an Ethernet frame according to an embodiment of the present invention.

The request message contains information requested by each network node. The request information includes a request ID (TS ID), a congestion state (BP) of a service port and an optical switch path, an ingress node 210 or a client information (S-PFWI ID) And may include destination-specific VOQ information that stores an optical frame to be transmitted through an optical switch path at one ingress node 210. The optical switch path ID (ID) can also be included, but is not shown in FIG. 12, and the optical switch path ID can be derived by the incoming node information and the destination-specific VOQ information sequentially listed for each destination.

12 illustrates an example in which 360 nodes each include 360 optical packets to be transmitted to 360 optical switch paths for transmitting optical frames to 360 destination nodes. It is. The VOQ information may include a data amount of an optical frame requiring transmission and a maximum delay condition of an optical frame not transmitted. At this time, the length of each information can be appropriately determined according to need.

13 is a diagram illustrating an example of an approval message per group using an Ethernet frame according to an embodiment of the present invention.

The acknowledgment message contains information that will be approved by different network nodes for each group. The authorization information includes optical switch path information available to each network node in the frame field allocated to the authorization time slot (TS ID) and the ingroup node (S-PFWI) in the group network, or the destination node 220 associated with the optical switch path. It contains information.

In other words, whether any network ingestion node can actually use the corresponding timeslot among requests for optical switch paths requesting permission to arbitrary timeslots to transmit optical frames, approval of use of time slots The attribute information of the optical switching path allocated is included. At this time, the length of each information may be an appropriate length according to need, specify the entry node ID specifically as required, and specify an approved destination node or an optical switching path. The acknowledgment and request message may be transmitted in a communication message other than Ethernet.

The present invention relates to a control management network used for generating and delivering an optical frame to a destination of an optical signal network (100) by service traffic flowing into a packet-type optical signal network (100). Specifically, a method of embodying a control management attribute for a packet-type optical signal network 100 and embodying a control network protocol capable of transmitting and receiving the control management attributes between the control server 300 and the network node in a short time without delay to provide. Thereby realizing the optical signal networking operation in a short time. The present invention makes it possible to control the optical network control time for several seconds or more by a few us, thereby making it possible to process packet-type optical signals that can be dynamically scheduled as well as line processing that is statically preset in the optical switch.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the apparatus and components described in the embodiments may be implemented within a computer system, such as, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA) , A programmable logic unit (PLU), a microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For ease of understanding, the processing apparatus may be described as being used singly, but those skilled in the art will recognize that the processing apparatus may have a plurality of processing elements and / As shown in FIG. For example, the processing unit may comprise a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as a parallel processor.

The software may include a computer program, code, instructions, or a combination of one or more of the foregoing, and may be configured to configure the processing device to operate as desired or to process it collectively or collectively Device can be commanded. The software and / or data may be in the form of any type of machine, component, physical device, virtual equipment, computer storage media, or device , Or may be permanently or temporarily embodied in a transmitted signal wave. The software may be distributed over a networked computer system and stored or executed in a distributed manner. The software and data may be stored on one or more computer readable recording media.

The method according to an embodiment may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions to be recorded on the medium may be those specially designed and configured for the embodiments or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks, and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

100: packet-type optical signal network
200: data plane
210: incoming node
211: Optical frame transmitter
212: optical variable transmitter
213: Optical path switch
214: control client
220: destination node
211: Optical receiver
212: optical frame receiver
230: Arranged optical waveguide grating routing
300: control server
310: Control interface manager
320: Optical Frame Scheduler

Claims (13)

A method of optical switching control performed by a data plane of a packet-type optical signal network,
Generating an optical switch path corresponding to a destination node of service traffic flowing from an external service network;
Generating an optical frame corresponding to the generated optical switch path;
Transmitting a request message to a control server to allocate a time slot for transmitting the generated optical frame;
Receiving an acknowledgment message as a result of the acknowledgment of the transmitted request message and generating an optical signal having a specific wavelength for transmitting the optical frame;
Setting an optical switch path for transmission of the optical signal by designating an input / output port and a switching port for switching the generated optical signal; And
Transmitting the optical frame to the destination node according to the allocated time slot and the set optical switch path
/ RTI > The method according to claim 1,
Wherein the step of transmitting the optical frame comprises:
An optical switching control method using an arrayed waveguide grating routing (AWGR) that changes an optical switch path according to a wavelength of an optical signal. The method according to claim 1,
Wherein the transmitting the request message comprises:
When receiving a request message for allocation of timeslots from another ingress node during transmission of a request message for use of the optical switch path and time slot allocation, the optical switching control method for sequentially transmitting the request message for the time slot allocation using the delay logic of the shift register . The method according to claim 1,
The request message for the optical switch path and the time slot allocation includes:
The destination node ID, the optical switch path ID, the congestion status of the service port and the optical switch path, the incoming node information that transmitted the request message, and the incoming node that transmitted the request message, And the VOQ information of each destination of the optical signal. An optical switching control method performed by a control server of a packet-type optical signal network,
Receiving a request message for use of a corresponding optical switch path and a time slot assignment from a control client of an ingress node;
Determining a specific optical switch path to be allocated to a specific time slot by performing a scheduling function based on the received request message; And
Transmitting an acknowledgment message to the control client of the ingress node as a result of the approval of the received request message
/ RTI > 6. The method of claim 5,
The request message for the optical switch path and the time slot allocation includes:
The destination node ID, the optical switch path ID, the congestion status of the service port and the optical switch path, the incoming node information that transmitted the request message, and the incoming node that transmitted the request message, And the VOQ information of each destination of the optical signal. 6. The method of claim 5,
The receiving of the request message comprises:
A method of optical switching control for grouping and processing request messages received from a plurality of ingress nodes. A data plane for transmitting service traffic to an ingress node of a packet-type optical network to a destination node using an optical signal;
A control server for controlling optical switching in a plurality of optical switch paths existing between the ingress node and the destination node of the data plane;
And an optical switching device. 9. The method of claim 8,
Wherein the data plane comprises:
An optical frame transmission unit managing an optical switch path corresponding to a destination node of the service traffic and generating an optical frame corresponding to the optical switch path;
A variable optical transmitter for generating an optical signal having a specific wavelength to transmit the generated optical frame to the destination node;
An arrayed waveguide grating routing (AWGR) for transmitting the optical signal having the specific wavelength to the destination node;
An optical receiver for receiving the optical signal having the specific wavelength and converting the optical signal into an electrical signal; And
An optical frame receiver for extracting the service traffic from an optical frame included in the received optical signal,
And an optical switching device. 9. The method of claim 8,
Wherein the optical switch path comprises:
An optical signal input / output port from the ingress node to a destination node, a time slot through which the optical signal is transmitted, and information on a wavelength of the optical signal. 9. The method of claim 8,
Wherein the control server comprises:
Receives a request message for use of the corresponding optical switch path and a time slot assignment from the control client of the ingress node, and transmits an approval message to the control client of the ingress node as a result of the approval of the received request message A control interface management unit;
A scheduler for determining a specific optical switch path to be allocated to a specific time slot by performing a scheduling function based on a request message for use of a corresponding optical switch path received by the control interface management unit and a request message for time slot allocation,
And an optical switching device. [Claim 11]
The control client of the ingress node,
And sequentially transmits the request message using the delay logic of the shift register when receiving the request message from another ingress node during transmission of the request message for use of the optical switch path and time slot allocation. 12. The method of claim 11,
Wherein the request message for the time slot assignment comprises:
The ID of the request time slot, the ID of the destination node, the optical switch path ID, the congestion state of the service port and the optical switch path, the incoming node information that transmitted the request message, And an optical switching control device including destination-specific VOQ information.

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