KR101583247B1 - Software defined networking based network, operating method thereof, network device - Google Patents

Software defined networking based network, operating method thereof, network device Download PDF

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KR101583247B1
KR101583247B1 KR1020140114752A KR20140114752A KR101583247B1 KR 101583247 B1 KR101583247 B1 KR 101583247B1 KR 1020140114752 A KR1020140114752 A KR 1020140114752A KR 20140114752 A KR20140114752 A KR 20140114752A KR 101583247 B1 KR101583247 B1 KR 101583247B1
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sdn controller
network
main
sub
network device
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KR1020140114752A
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Korean (ko)
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고영배
김재범
김현민
안재용
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아주대학교산학협력단
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Abstract

An SDN-based network, a method of operating the same, and a network device are disclosed. An SDN-based network according to one aspect of the present invention includes a main SDN controller; And a plurality of network devices controlled by the main SDN controller and communicating with at least one terminal, wherein at least one of the plurality of network devices performs at least a part of the network control functions of the main SDN controller .

Figure R1020140114752

Description

TECHNICAL FIELD [0001] The present invention relates to a software-defined networking-based network, a method of operating the same, and a network device,

The technical idea of the present invention relates to a software defined networking (SDN) -based network, a method of operating the same, and a network device, and in particular, a network device constituting an SDN- An SDN-based network, a method of operating the same, and a network device.

In general, the OSI 7 layer-based network integrates a data plane in which data packets are transmitted and a control plane that manages the transmission processing process of data packets, so that the network according to the complexity of the network and the traffic congestion state There is a drawback that it is difficult to add new functions and improve the functions of the devices constituting the network. As an alternative to this, an SDN technique has been proposed in which the data plane and the control plane are separated by software so that the apparatus constituting the network only carries the transmission of the data packet and the controller intensively manages the control functions of the network.

However, when a wired access network is used to provide terminal access to the Internet by applying SDN technology, all control functions are concentrated in the controller, which increases the processing load of the controller. Depending on the location of the network equipment and the controller New problems have arisen, such as an increase in the delay time and an interruption in the operation of the SDN-based network in the event of controller failure or disconnection.
On the other hand, the technique as a background of the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2014-0039014 (Mar. 31, 2014).

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to overcome the problem that all or a part of the controller functions in the SDN-based network are performed in place of the network devices constituting the SDN- SDN-based network, a method of operating the same, and a network device.

Other objects and advantages of the present invention will be apparent from the following description taken in conjunction with the accompanying drawings, in which: FIG.

According to an aspect of the present invention, an SDN-based network includes a main SDN controller; And a plurality of network devices controlled by the main SDN controller and communicating with at least one terminal, wherein at least one of the plurality of network devices performs at least a part of the network control functions of the main SDN controller .

In some embodiments, the main SDN controller may receive status information from the plurality of network devices and, based on the status information, replace at least some of the network control functions of the main SDN controller among the plurality of network devices At least one network device can be selected to perform the function, and the function to be distributed to the selected network device can be selected by selecting the function to be distributed to the selected network device.

In some embodiments, the status information may include resource usage information according to the number of terminals connected to each of the plurality of network devices, and the main SDN controller may determine, based on the resource usage information, It is possible to select a network device having the smallest resource usage in place of at least a part of the network control functions of the main SDN controller.

In some embodiments, the status information may include traffic throughput information in response to a request from a terminal connected to each of the plurality of network devices, and the main SDN controller, May be selected as a network device to perform at least a part of the network control functions of the main SDN controller.

In some embodiments, the main SDN controller may stop performing functions distributed to the selected network device, and the selected network device may perform functions distributed from the main SDN controller.

In some embodiments, the plurality of network devices each include an SDN controller module for performing at least a portion of the network control functions of the main SDN controller on behalf of the main SDN controller; An interface module for supporting a function implementation of the SDN controller module or for supporting communication with the main SDN controller and communication with other network devices constituting the SDN based network; And a communication module for supporting communication with the terminal.

In some embodiments, the plurality of network devices may be any one of a wireless access point, a base station, and a wire-based switch for providing an Internet service to the terminal.

In some embodiments, the network device performing at least a portion of the network control functions of the main SDN controller or the main SDN controller may be configured to transmit the signal of the first terminal acquired by each of the first and second network devices And may select a network device for performing communication with the first terminal among the first and second network devices based on the received terminal information.

According to another aspect of the present invention, there is provided a method of operating an SDN-based network, comprising: receiving status information from a plurality of network devices by a main SDN controller; The main SDN controller selecting at least one of the plurality of network devices as a sub SDN controller based on the received status information; Selecting at least some network control functions to be distributed to the sub-SDN controller among the network control functions of the main SDN controller; The main SDN controller transmitting data for the selected network control function to the sub SDN controller; And the sub-SDN controller performing a distributed control function from the main SDN controller.

In some embodiments, the status information may include resource usage information according to the number of terminals connected to each of the plurality of network devices, and the main SDN controller may determine, based on the received status information, , The main SDN controller can select a network device having the minimum resource usage among the plurality of network devices based on the resource usage information as the sub SDN controller.

In some embodiments, the status information may include traffic throughput information in response to a request from a terminal connected to each of the plurality of network devices, and the main SDN controller transmits, The main SDN controller may select a network device having the minimum traffic throughput among the plurality of network devices as the sub SDN controller based on the traffic throughput information.

In some embodiments, the step of the main SDN controller transmitting data for the selected network control function to the sub-SDN controller comprises: transmitting the selection result message to the sub-SDN controller by the main SDN controller; Determining whether the main SDN controller is operating normally; And if it is determined that the sub-SDN controller is operating normally, the main SDN controller transfers data for the selected network control function to the sub-SDN controller and stops performing the network control function distributed to the sub-SDN controller The method comprising the steps of:

In some embodiments, the step of determining whether the main SDN controller operates normally may include determining whether the main SDN controller is operating normally or not, depending on whether the main SDN controller receives a response message from the sub- It is possible to judge whether or not the normal operation of the motor is possible.

In some embodiments, if the main SDN controller is not determined to be in normal operation, determining whether the sub SDN controller is re-selected according to its calculation amount or failure occurrence have.

In some embodiments, before the sub-SDN controller performs a distributed network control function from the main SDN controller after the main SDN controller transmits data for the selected network control function to the sub-SDN controller, Transmitting, by the main SDN controller, a selection result message to a network device other than the network device selected by the sub-SDN controller; And registering information on the sub-SDN controller by a network device other than the network device selected by the sub-SDN controller.

According to another aspect of the present invention, there is provided a network device that configures an SDN-based network and provides at least one terminal with an Internet service, wherein at least a part of the SDN-based network control functions of the main SDN controller An SDN controller module for performing on behalf of the main SDN controller; An interface module for supporting a function implementation of the SDN controller module or for supporting communication with the main SDN controller and communication with other network devices constituting the SDN based network; And a communication module for supporting communication with the terminal.

In some embodiments, the SDN controller module may include data for at least some of the network control functions of the main SDN controller, which are transmitted from the main SDN controller.

The SDN-based network, the method of operating the same, and the network device according to the technical idea of the present invention perform at least one of the plurality of network devices in place of all or a part of the functions of the main SDN controller, It can be prevented from being performed intensively.

Accordingly, it is possible to reduce the processing load of the main SDN controller, reduce the traffic between the main SDN controller and the network devices constituting the SDN-based network, and provide services to the user even when the main SDN controller fails or disconnects. Can be stably provided.

BRIEF DESCRIPTION OF THE DRAWINGS A brief description of each drawing is provided to more fully understand the drawings recited in the description of the invention.
FIG. 1 is a diagram for explaining an environment of an SDN-based network according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a detailed configuration of an SDN-based network according to an exemplary embodiment of the present invention. Referring to FIG.
3 and 4 are views for explaining a method of operating an SDN-based network according to an embodiment of the present invention.
5 and 6 are views for explaining a handoff to a mobile terminal in an SDN-based network according to an embodiment of the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

Also, the terms "to", "to", "to", "to" and "module" in the present specification mean a unit for processing at least one function or operation, Software. ≪ / RTI >

It is to be clarified that the division of constituent parts in this specification is merely a division by each main function of each constituent part. That is, two or more constituent parts to be described below may be combined into one constituent part, or one constituent part may be divided into two or more functions according to functions that are more subdivided. In addition, each of the constituent units described below may additionally perform some or all of the functions of other constituent units in addition to the main functions of the constituent units themselves, and that some of the main functions, And may be carried out in a dedicated manner.

Hereinafter, embodiments of the present invention will be described in detail.

FIG. 1 is a diagram for explaining an environment of an SDN-based network according to an embodiment of the present invention.

Referring to FIG. 1, an SDN-based network N may include a main SDN controller 100 and a plurality of network devices 200.

The main SDN controller 100 may be connected to a plurality of network devices 200 via an infrastructure (IFS). In another embodiment, the main SDN controller 100 may be directly connected to a plurality of network devices 200 (see FIG. 2).

The main SDN controller 100 may be located in a network, such as the Internet, an intranet, for example. However, the present invention is not limited thereto, and the main SDN controller 100 may be disposed at an arbitrary position.

The main SDN controller 100 can control a plurality of network devices 200. [ For example, the main SDN controller 100 controls the communication between the plurality of network devices 200 and the terminal 300, the communication between the plurality of network devices 200, and the resource status of each of the plurality of network devices 200 Thereby managing the SDN-based network N as a whole.

A plurality of network devices (200) can communicate with a corresponding one of a plurality of terminals (300). In some embodiments, the plurality of network devices 200 may be a wireless access point or a wire-based switch for providing Internet services to the corresponding terminal. In another embodiment, a plurality of network devices 200 may be an evolved Node-B (eNB) for providing Internet service to the corresponding terminal, wherein a plurality of network devices 200 And provide the mobile communication service to the corresponding terminal.

At least some of the plurality of network devices 200 can be performed on behalf of at least some of the control functions for managing the SDN-based network N overall through the control of the functions of the main SDN controller 100, have. This will be described in more detail with reference to FIG. 2 to FIG.

The plurality of terminals 300 may be various user devices that perform wired or wireless coupled communication with corresponding network devices such as a mobile phone, a PC, a tablet PC, a PDA (personal digital assistant) .

FIG. 2 is a diagram illustrating a detailed configuration of an SDN-based network according to an exemplary embodiment of the present invention. Referring to FIG. 2, the first to third network devices 200-1 to 200-3 of the plurality of network devices and the first to fifth terminals 300-1 to 300-5 of the plurality of terminals, And the first to third network devices 200-1 to 200-3 are shown as being directly connected to the main SDN controller 100, unlike in FIG. 1 will be described with reference to FIG. 1 for the sake of convenience of description, and a description overlapping with that of FIG. 1 will be omitted. The main SDN controller 100 and the first to third network devices 200-1 to 200- 200-3) based on SDN-based network (N) control function processing. On the other hand, the SDN-based network N shown in FIG. 2 is configured such that the first to third network devices 200-1 to 200-3 constituting the radio access network, that is, the SDN-based network N, The following description will be given.

Referring to FIGS. 1 and 2, the main SDN controller 100 may receive status information from the first through third network devices 200-1 through 200-3. The status information includes resource usage information according to the number of terminals connected to each of the first to third network devices 200-1 to 200-3, traffic throughput information according to a request of a connected terminal, computation amount information, . In addition, the main SDN controller 100 can receive the terminal information from the first to third network devices 200-1 to 200-3. The terminal information may include identification information of the terminal connected to or detected by each of the first to third network devices 200-1 to 200-3, traffic information, signaling information, signal characteristic information on the signal strength, . ≪ / RTI >

The main SDN controller 100 controls the SDN-based network N control function (hereinafter referred to as a network control function), i.e., a global view of the SDN-based network N, based on the status information and the like A network for carrying out at least a part of functions such as forwarding control between the elements based on the topology, basic functions such as topology management, resource status management, and routing control, and differentiated forwarding and packet processing according to the higher policy and requirements (Hereinafter referred to as a sub SDN controller) among the first to third network devices 200-1 to 200-3. Here, at least one sub-SDN controller can be selected.

In some embodiments, the main SDN controller 100 controls the first to third network devices 200-1 to 200-3 based on the resource usage of each of the first to third network devices 200-1 to 200-3. 3), the sub-SDN controller can be selected. In this case, in the embodiment shown in FIG. 2, since there is no terminal to which the second network device 200-2 is connected, the main SDN controller 100 allocates the second network device 200-2 to the sub- Controller can be selected.

In another embodiment, the main SDN controller 100 controls the first through third network devices 200-1 through 200-3 based on traffic throughput information of each of the first through third network devices 200-1 through 200-3, 3), the sub-SDN controller can be selected. For example, assuming that the resource amounts of the first to third network devices 200-1 to 200-3 are the same, the main SDN controller 100 controls the first to third network devices 200-1 to 200-3 ) Can be selected as the sub SDN controller. On the other hand, the main SDN controller 100 determines whether or not the first to third network devices 200-1 to 200-3 are connected to each other, regardless of the resource usage of the first to third network devices 200-1 to 200-3 It is needless to say that a specific network device can be selected as the sub SDN controller only based on the traffic throughput.

In another embodiment, the main SDN controller 100 determines whether the first to third network devices 200-1 to 200-3 are connected to each other based on the security policy of the SDN-based network N, A specific network device can be selected as a sub SDN controller.

The main SDN controller 100 can select a function to be distributed to the sub SDN controller from among its network control functions.

In some embodiments, the main SDN controller 100 may select all of its network control functions as a function to distribute to the sub-SDN controller. For example, when a failure occurs in the main SDN controller 100 and it is necessary to disconnect from the first to third network devices 200-1 to 200-3, the main SDN controller 100 transmits all of its network control functions The function to be distributed to the sub SDN controller can be selected.

In another embodiment, the main SDN controller 100 may select only a portion of its network control functions as a function to distribute to the sub-SDN controller. For example, when the main SDN controller 100 and the sub-SDN controller need to be operated in dual operation in consideration of the management efficiency of the SDN-based network N, To the sub-SDN controller.

When a plurality of sub-SDN controllers are selected, the main SDN controller 100 can distribute different network control functions for each of the sub-SDN controllers, and distributes the same network control functions for all the sub-SDN controllers And may distribute network control functions such that some of the functions are duplicated in the sub-SDN controllers.

The main SDN controller 100 can transfer data on the network control function selected by the sub SDN controller. The main SDN controller 100 stops performing the network control function distributed to the sub SDN controller and transmits information on the selection result of the sub SDN controller and the distributed function to other network devices, To control other network devices.

On the other hand, when the sub-SDN controller 100 does not normally operate, the main SDN controller 100 may not transfer data on the network control function selected by the sub-SDN controller, ) Or by selecting a sub-SDN controller again and processing it in place of at least some of its network control functions.

The first to third network devices 200-1 to 200-3 can receive the operation policy information of the SDN-based network N from the main SDN controller 100, respectively. The operation policy information may include a transmission period, a transmission content, a transmission rate, and the like of the status information and / or the terminal information of the first to third network devices 200-1 to 200-3. The operation policy information can be arbitrarily set according to the service characteristic of the SDN-based network N, and can be changed according to the request of the administrator.

Each of the first to third network devices 200-1 to 200-3 can operate as a sub-SDN controller and includes an SDN controller module 210, an interface module 230 and a communication module 250 .

The SDN controller module 210 may be a module for performing the functions distributed from the main SDN controller 100 on behalf of the main SDN controller 100. The SDN controller module 210 may be a software program and may include data for the network control functions distributed from the main SDN controller 100 as the corresponding network device is selected as the sub SDN controller.

The interface module 230 is a protocol supporting implementation of the network control functions of the main SDN controller 100 and / or the SDN controller module 210 for the network devices constituting the SDN-based network N, an openflow module (not shown).

The interface module 230 may include a West / East bound module (not shown) for communicating with the main SDN controller 100 and communication between the network devices, for example, transmitting / receiving predetermined information, messages, have.

The communication module 210 is a module for supporting communication with a terminal connected to a corresponding network device, and may be a MAC / PHY module for supporting standard protocols such as IEEE 802.11.

As described above, in the SDN-based network N according to the technical idea of the present invention, the processing load of the main SDN controller can be reduced by processing a specific network device in place of at least a part of the network control functions of the main SDN controller, It is possible to reduce the traffic between the SDN controller and the network devices constituting the SDN-based network, and to reliably provide the service to the user even when the main SDN controller fails or disconnects.

3 and 4 are views for explaining a method of operating an SDN-based network according to an embodiment of the present invention. 3 illustrates the operation of distributing the network control function from the main SDN controller 100 to the second network device 200-2 in the SDN based network N shown in FIG. FIG. 4 is a diagram for explaining some steps of FIG. 3 on the main SDN controller 100 side. In describing FIGS. 3 and 4, the description with reference to FIG. 2 will be omitted, and a description overlapping with FIG. 2 will be omitted.

Referring to FIG. 3, each of the first to third network devices 200-1 to 200-3 transmits status information and terminal information to the main SDN controller 100 (S3110, S3130, S3150).

In FIG. 3, each of the first to third network devices 200-1 to 200-3 transmits status information and terminal information at the same time, but is not limited thereto. Each of the first to third network devices 200-1 to 200-3 can transmit status information and terminal information to the main SDN controller 100 at predetermined time intervals. In FIG. 3, the first to third network devices 200-1 to 200-3 sequentially transmit corresponding status information and terminal information to the main SDN controller 100. However, , And the first to third network devices 200-1 to 200-3 can simultaneously transmit corresponding status information and terminal information. The first to third network devices 200-1 to 200-3 receive the operation policy information from the main SDN controller 100 and then transmit status information and / or terminal information to the main SDN To the controller (100).

The main SDN controller 100 transmits the operation policy information to the first to third network devices 200-1 to 200-3 (S3210, S3230, S3250). 3, the main SDN controller 100 sequentially transmits the operation policy information to the first through third network devices 200-1 through 200-3. However, the present invention is not limited to this, (100) can simultaneously transmit the operation policy information to the first to third network devices (200-1 to 200-3).

The main SDN controller 100 selects at least one of the first through third network devices 200-1 through 200-3 as a sub SDN controller based on the received status information, At least some network control functions to be distributed to the sub-SDN controller are selected (S3300).

The main SDN controller 100 compares the resource usage information of each of the first to third network devices 200-1 to 200-3 with the received status information and transmits the network device having the minimum resource usage to the sub- Can be selected. Alternatively, the main SDN controller 100 compares the traffic throughput information of each of the first to third network devices 200-1 to 200-3 with the received status information, and transmits the network device having the minimum traffic throughput to the sub- SDN controller can be selected. Alternatively, in addition to the received status information, the main SDN controller 100 may select a specific network device as the sub-SDN controller based on the security policy included in the operation policy, whether a priority client included in the terminal information is connected, have. Hereinafter, an example in which the second network device 200-2 having the minimum resource usage is selected as the sub-SDN controller will be described.

The main SDN controller 100 can select a function to be distributed to the second network device 200-2 from among its network control functions. At this time, the main SDN controller 100 selects all or a part of its network control functions as a function to distribute to the second network device 200-2 in consideration of the failure status of the main SDN controller 100 or the efficiency of network management .

The main SDN controller 100 transmits the selection result message indicating the selection result of the sub-SDN controller and the distribution function to the second network device 200-2 (S3400).

The second network device 200-2 confirms the result of selecting the sub-SDN controller and the function to be performed based on the selection result message (S3500).

The second network device 200-2 operates as a sub-SDN controller and transmits a response message to the main SDN controller 100 (S3600).

The main SDN controller 100 transmits data on the function selected to be distributed to the second network device 200-2 to the second network device 200-2 (S3700).

The main SDN controller 100 transmits the selection result message to the first network device 200-1 (S3810), and the first network device 200-1 transmits the selection result message to the sub-SDN controller And registers information on the second network device 200-2 (S3830). The main SDN controller 100 transmits the selection result message to the third network device 200-3 (S3850), and the third network device 200-3 transmits the selection result message to the second network 200-3 And registers information on the device 200-2 (S3870).

Then, the first network device 200-1 transmits the status information and the terminal information to the second network device 200-2 (S3910), and the second network device 200-2 transmits the status information and the terminal information to the first network device 200-2 -1) (S3930). The third network device 200-3 transmits the status information and the terminal information to the second network device 200-2 (S3950), and the second network device 200-2 transmits the status information and the terminal information to the third network device 200-3 (Step S3970).

4 for further explanation of steps S3300 to S3700 in terms of the main SDN controller 100, the main SDN controller 100 controls the first to third network devices 200-1 to 200-3 based on the status information, (S4200), and transmits a selection result message to the selected sub-SDN controller (S4300). Subsequently, the sub-SDN controller selects a function to be distributed to the sub-SDN controller It is determined whether or not the selected network device is operating normally (S4400).

Here, the main SDN controller 100 determines whether the second network device 200-2 is operating normally according to whether a response message transmitted from the network device selected by the sub-SDN controller is received within a predetermined time.

For example, when the response message is received within a predetermined time, the main SDN controller 100 determines that the network device selected by the sub-SDN controller is operating normally, And the execution of the distributed function is suspended (S4500).

On the other hand, when the response message is not received within a predetermined time, the main SDN controller 100 determines that the network device selected by the sub-SDN controller does not operate normally and determines whether to reselect the sub-SDN controller (S4600).

The main SDN controller 100 determines whether it is necessary to re-select the sub-SDN controller based on, for example, its own computation amount or fault occurrence. If it is necessary to re-select the sub-SDN controller, And terminates the procedure without transferring the distribution function if re-selection of the sub-SDN controller is not required.

Thus, network devices can process at least some of the network control functions of the main SDN controller based on the usage status of the network devices constituting the SDN-based network, the status of the main SDN controller, It is possible to solve the problem due to concentration of the control function and to ensure the reliability of the network service which is provided to the user by managing the network stably.

5 and 6 are views for explaining a handoff to a mobile terminal in an SDN-based network according to an embodiment of the present invention. 5 and 6, only the first to third network devices 200-1 to 200-3 and the sixth terminal 300-6 as a mobile terminal are shown for convenience of explanation, and the second network device 200 2 operates as a sub SDN controller that manages the SDN-based network N on behalf of the main SDN controller 100 (see FIG. 2), and after communicating with the first network device 200-1 first, The handoff of the sixth terminal 300-6 moving from the first terminal 200-1 to the third network device 200-3 is controlled. It will be readily understood by those skilled in the art that the main SDN controller 100 (see FIG. 2), which performs substantially the same function as the sub-SDN controller, can manage the handoff to the moving terminal, Let them know that they are omitted. On the other hand, the SDN-based network N shown in FIG. 5 is configured such that the first to third network devices 200-1 to 200-3 constituting the radio access network, that is, the SDN-based network N, The following description will be given.

Referring to FIG. 5, a plurality of network devices constituting the SDN-based network N respectively transmit terminal information on the acquired mobile terminals to the second network device 200-2 every predetermined period according to the operation policy. Lt; / RTI >

For example, each of the first and third network devices 200-1 and 200-3 senses a signal transmitted by the sixth terminal 300-6 and outputs signal characteristic information indicating signal strength or signal quality, Information, traffic information, and the like, and may transmit the acquired terminal information to the second network device 200-2.

The second network device 200-2 identifies the mobile terminals that are duplicated in the network devices based on the received mobile terminal information, and selects the optimal mobile device among the network devices based on the received mobile terminal information A network device can be selected.

For example, the second network device 200-2 may transmit the sixth terminal 300-n, which is duplicatedly detected by the first and third network devices 200-1 and 200-3, based on the identification information in the received terminal information, 6, and as the sixth terminal 300-6 moves from the first network device 200-1 side to the third network device 200-3 side as shown in FIG. 5, The second network device 200-2 transmits the third network device 200-3 to the sixth terminal 300-3 because the signal intensity of the sixth terminal 300-6 detected by the device 200-3 is large, 6) and a network device for performing communication.

The second network device 200-2 may request the mobile device to transfer information about the corresponding mobile device from the connected network device to the selected network device before the mobile device moves, The connected network device can transfer the information about the mobile terminal to the selected network device after the movement. For example, the second network device 200-2 transmits information about the sixth terminal 300-6 to the first network device 200-1, which was connected before the sixth terminal 300-6 moved. 3 network device 200-3 and the first network device 200-1 can transmit information on the sixth terminal 300-6 to the third network device 200-3 .

As described above, according to the control of the second network device 200-2 which operates as a sub SDN controller in the SDN-based network N implemented by the radio access network, the first to third network devices 200-1 to 200-3 It is possible to provide a high-quality Internet service to the user of the mobile terminal in the network unlike the conventional radio access network.

6, which shows in more detail the handoff control process in the SDN-based network N shown in FIG. 5, the first network device 200-1 is first connected to the sixth terminal 300-6 And transmits the acquired terminal information to the second network device 200-2 according to the communication (S6100). Although not shown in FIG. 6, the third network device 200-3 also transmits information about the connected terminal to the second network device 200-2 at the same time or at a time difference from the first network device 200-1 And the first and third network devices 200-1 and 200-3 may transmit status information to the second network device 200-2, respectively.

Each of the first and third network devices 200-1 and 200-3 detects the characteristics of a signal transmitted by the sixth terminal 300-6 in steps S6210 and S6230, (2001, 200-3) transmits the terminal information indicating the characteristics of the sensed signal, for example, the signal strength, to the second network device 200-2 (S6310, S6330).

The second network device 200-2 is an optimal network device for communicating with the sixth terminal 300-6 among the first and third network devices 200-1 and 200-3 based on the received terminal information (S6400). Here, the second network device 200-2 transmits the third network device 200-3, which is adjacent to the sixth terminal 300-6, to the sixth network device 200-3 based on the signal characteristics included in the received terminal information, And can be selected as a network device for communicating with the terminal 300-6.

The second network device 200-2 transmits the information about the sixth terminal 300-6 to the third network device 200-1 through the first network device 200-1 connected to the sixth terminal 300-6 first, 3) (S6500).

The first network device 200-1 transfers information on the sixth terminal 300-6 to the third network device 200-3 (S6610), and the third network device 200-3 transmits the information on the sixth terminal 300-6 When the completion is completed, the completion result is transmitted to the first network device 200-1 (S6630). 6, if the first network device 200-1 does not receive the completion result from the third network device 200-3, the first network device 200-1 is again connected to the sixth terminal 200-1 300-6 can be transferred to the third network device 200-3.

When the transfer of the information related to the sixth terminal 300-6 is completed, the first network device S6650 deletes the information related to the sixth terminal 300-6 (S6650), and the third network device 200- 3 are connected to the sixth terminal 300-6 to perform communication (S6670).

Subsequently, the first and third network devices 200-1 and 200-3 transmit updated status information to the second network device 200-2 (S6710 and S6730), respectively, and the second network device transmits the updated status information to the first network device 200-2 And information on the second network device (S6800).

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, but, on the contrary, This is possible.

100: Main SDN controller
200: Network device
300: terminal

Claims (17)

A main software defined networking (SDN) controller; And
A plurality of network devices controlled by the main SDN controller and communicating with at least one terminal,
Wherein at least one of the plurality of network devices performs at least a part of network control functions of the main SDN controller in place of the main SDN controller,
Wherein the network control function performed by at least one of the plurality of network devices on behalf of the main SDN controller comprises a handoff control function for the terminal.
The method according to claim 1,
The main SDN controller,
Receiving status information from the plurality of network devices,
Selecting at least one network device for performing at least part of the network control functions of the main SDN controller among the plurality of network devices based on the status information,
Wherein the SDN-based network is configured to select a function to be distributed to the selected network device and to migrate data on a function to be distributed to the selected network device.
3. The method of claim 2,
The status information may include:
Resource usage information according to the number of terminals connected to each of the plurality of network devices,
The main SDN controller,
Based on the resource usage information, a network device having a minimum resource usage among the plurality of network devices as a network device for performing at least a part of network control functions of the main SDN controller.
3. The method of claim 2,
The status information may include:
Traffic throughput information according to a request of a terminal connected to each of the plurality of network devices,
The main SDN controller,
And selects a network device having a minimum traffic throughput among the plurality of network devices based on the traffic throughput information as a network device for performing at least a part of network control functions of the main SDN controller.
3. The method of claim 2,
The main SDN controller,
Stopping execution of a function distributed to the selected network device,
Wherein the selected network device comprises:
And performs functions distributed from the main SDN controller.
The method according to claim 1,
The plurality of network devices each include:
An SDN controller module for performing at least a part of the network control functions of the main SDN controller on behalf of the main SDN controller;
An interface module for supporting a function implementation of the SDN controller module or for supporting communication with the main SDN controller and communication with other network devices constituting the SDN based network; And
A communication module for supporting communication with the terminal;
Gt; SDN < / RTI > based network.
The method according to claim 1,
Wherein the plurality of network devices comprise:
Wherein the SDN-based network is a wireless access point or a base station providing an Internet service to the terminal.
The method according to claim 1,
The network device performing at least a part of the network control functions of the main SDN controller or the main SDN controller,
Receiving terminal information indicating a signal characteristic of a first terminal acquired by each of first and second network apparatuses of the plurality of network apparatuses, and transmitting, from the first and second network apparatuses, 1. An SDN-based network for selecting a network device for performing communication with a terminal and controlling handoff to the first terminal.
Receiving status information from a plurality of network devices in which the main SDN controller communicates with at least one terminal;
The main SDN controller selecting at least one of the plurality of network devices as a sub SDN controller based on the received status information;
Selecting at least some network control functions to be distributed to the sub-SDN controller among the network control functions of the main SDN controller;
The main SDN controller transmitting data for the selected network control function to the sub SDN controller; And
The sub-SDN controller performing a distributed network control function from the main SDN controller;
, ≪ / RTI &
Wherein the selected network control function includes a handoff control function for the terminal.
10. The method of claim 9,
The status information may include:
Resource usage information according to the number of terminals connected to each of the plurality of network devices,
Wherein the main SDN controller selects at least one of the plurality of network devices as a sub SDN controller based on the received status information,
And the main SDN controller selects a network device having the smallest resource usage among the plurality of network devices as the sub-SDN controller based on the resource usage information.
10. The method of claim 9,
The status information may include:
Traffic throughput information according to a request of a terminal connected to each of the plurality of network devices,
Wherein the main SDN controller selects at least one of the plurality of network devices as a sub SDN controller based on the received status information,
And the main SDN controller selects a network device having the minimum traffic throughput among the plurality of network devices as the sub-SDN controller based on the traffic throughput information.
10. The method of claim 9,
Wherein the step of transferring data for the selected network control function by the main SDN controller to the sub-
The main SDN controller transmitting a selection result message to the sub-SDN controller;
Determining whether the main SDN controller is operating normally; And
If it is determined that the sub-SDN controller is operating normally, the main SDN controller transfers data for the selected network control function to the sub-SDN controller and stops performing the network control function distributed to the sub-SDN controller step;
Based network.
13. The method of claim 12,
Wherein the step of the main SDN controller determining whether the sub SDN controller operates normally includes:
And determines whether the sub-SDN controller is operating normally according to whether the main SDN controller receives a response message from the sub-SDN controller within a predetermined time.
13. The method of claim 12,
Determining whether the main SDN controller is to be re-selected according to its calculation amount or failure occurrence, when it is not determined that the sub-SDN controller is operating normally;
Further comprising the steps < RTI ID = 0.0 > of: < / RTI >
10. The method of claim 9,
Before the sub-SDN controller performs a distributed network control function from the main SDN controller after the main SDN controller transmits data for the selected network control function to the sub-SDN controller,
Transmitting, by the main SDN controller, a selection result message to a network device other than the network device selected by the sub-SDN controller; And
Registering information on the sub-SDN controller by a network device other than the network device selected by the sub-SDN controller;
Further comprising the steps < RTI ID = 0.0 > of: < / RTI >
A network device that configures an SDN-based network and provides Internet services to at least one terminal,
An SDN controller module for performing at least a part of the network control functions of the main SDN controller on behalf of the main SDN controller;
An interface module for supporting a function implementation of the SDN controller module or for supporting communication with the main SDN controller and communication with other network devices constituting the SDN based network; And
A communication module for supporting communication with the terminal;
≪ / RTI >
Wherein the network control function of the main SDN controller performed by the SDN controller module on behalf of the main SDN controller includes a handoff control function for the terminal.
17. The method of claim 16,
The SDN controller module includes:
And data for at least some of the network control functions of the main SDN controller being transferred from the main SDN controller.
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