KR101858957B1 - Control system for establishing centralized wlan network based on sdn - Google Patents

Abstract

The present invention relates to a control system for establishing a WLAN network, and more particularly, to a wireless local area network (WLAN) network structure using a wireless AP (Access Point) using a Software Defined Network (SDN) The present invention relates to a control system for establishing a centralized WLAN network based on SDN, which can prevent a problem in a data service even if a failure occurs between an SDN controller and a wireless AP.
In order to achieve the above object, the present invention provides a data communication system including a data path (Data Path: 1) for enabling network communication between any one or more basic data services selected from the Internet and a packet forwarding service, A wireless SDN-AP (Software Defined Network-Access Pointer) 100 for providing a control path (Control Path) 2 for performing a service through a separate authentication procedure; And a smart SDN controller 200 communicating with the wireless SDN-AP 100 through the SDN protocol (SDN protocol) to enable network communication of the additional data service through the control path 2 .

Description

{CONTROL SYSTEM FOR ESTABLISHING CENTRALIZED WLAN NETWORK BASED ON SDN}

The present invention relates to a control system for establishing a WLAN network, and more particularly, to a wireless local area network (WLAN) network structure using a wireless AP (Access Point) using a Software Defined Network (SDN) The present invention relates to a control system for establishing a centralized WLAN network based on SDN, which can prevent a problem in a data service even if a failure occurs between an SDN controller and a wireless AP.

In general, an AP providing a wireless service to a user in the WLAN network realizes a user wireless network in the form of an ad-hoc network, and a PON (Passive Optical Network ) Or an L2 or L3 switch.

In particular, unlike other network devices, a wireless AP has functions of all layers referred to in the OSI (Open System Interconnection) layer 7, but since the wireless AP of the WLAN is not a network device having a mesh network configuration, The process of calculating and finding the optimal routing path by checking the destination information of the data is performed by the NAT (Network Address Translation) function or the bridge mode according to the fact that the host device is mainly replaced by not the wireless AP.

In the current SDN, the controller manages the entire network, so it can easily know that an overload has occurred in a particular path, and by sharing this information with the application program, it can calculate the optimal routing path for that path, Distance path application, and so on.

However, when the link or node of the network fails in the present network environment, it is impossible to recover the service while maintaining the QoS of the call and the real-time multimedia service when the centralized controller judges it and sends a control command in excess of 50 ms .

This is because the controller of the SDN tries to centrally control the routing path to the data transmission device, which may cause a traffic delay problem and a failure in route setting at the time of setting, to be.

It is not easy to implement a centralized WLAN network by applying universal SDN technology to a wireless AP in view of this realistic reason and the network configuration characteristic of a wireless AP, which is an obstacle to the spread of SDN technology in the wireless LAN field .

It is also impractical to abandon existing network technologies or all the components of the current Internet at once, in order to implement a WLAN network capable of centralized control through SDN technology.

Therefore, in order to apply the SDN technology to the wireless AP, a complex form in which the network schedule portion is operated by a logically centralized control portion and the remaining portion is operated by a conventional distributed type control portion is a more realistic method. It is necessary to continue research on this.

Korean Patent Publication No. 10-1767472 Korean Patent Publication No. 10-2016-0109214

SUMMARY OF THE INVENTION The present invention is conceived to solve the problems of the prior art described above, and it is an object of the present invention to provide a wireless access point (AP) in a centralized WLAN network structure through SDN, The present invention provides a control system for establishing a centralized WLAN network based on SDN.

In order to achieve the above object, the present invention provides a data communication system including a data path that enables network communication between any one or more basic data services selected from the Internet and a packet forwarding service, A SDN-AP (Wireless SDN-AP), which provides a control path for performing a separate authentication process, and an SDN-AP And a smart SDN controller that enables the smart SDN controller.

The SDN-AP includes a driver module including at least one of an Ethernet driver and a hardware interface driver, a common driver interface, a data service, And a firmware including at least one of a wireless LAN driver (WLAN Driver) and a packet forwarding engine (Packet Forwarding Engine).

In addition, the SDN-AP communicates with the smart SDN controller only on data of the control path through an Open Agent module that is operated under an Open API (Application Programming Interface).

In addition, the smart SDN controller is comprised of a control layer for interfacing with the Open Agent module of the SDN-AP and an application layer for virtually implementing a network function.

The supplementary data service is started after the data table of the packet forwarding engine is updated to the smart SDN controller when connection establishment of the smart SDN controller is completed through the control path.

The supplementary data service includes at least one of Network Address Translation (NAT), Dynamic Host Configuration Protocol (DHCP), Virtual Local Area Network (VLAN), Service Set Identifier (SSID), Security, Remote Access and Internet Group Management Protocol (IGMP) And at least one of them is included.

The control system for constructing the SDN-based centralized WLAN network according to the present invention simply adds a smart SDN controller to the existing wireless SDN-AP and an Open Agent module, which is a software module for the SDN interface, The effect can be realized.

Since the common functions distributed to existing APs can be set and monitored by one smart SDN controller, the network operating cost can be effectively reduced. Also, since existing APs have many setting and monitoring functions, Although load can be generated, it is also possible to reduce the operating cost for maintenance since the wireless SDN-AP can reduce the errors caused by the software by reducing the setup and monitoring functions.

In addition, the wireless SDN-AP leaves only the real-time traffic processing function and the wireless RF function and can be implemented differently according to each manufacturer / equipment. However, the management, control and security functions performing the same functions, maintenance Maintenance functions can be separated and integrated into the smart SDN controller, so that the centralized management wireless SDN-AP can be implemented at a low cost by upgrading the existing equipment to a software only.

Therefore, it is possible to automate the operation and central management if the same function is implemented for each manufacturer / equipment and the setting system is unified by changing the wireless SDN-AP by opening the structure and reducing the cost of network upgrading and existing network management. And can operate and configure a highly efficient network, which can greatly reduce operating costs.

In addition, the Smart SDN controller provides the Open API to easily add various additional virtualization modules, thereby creating a revenue source through the development of a new supplementary service model.

1 is a network configuration diagram of a conventional wireless AP.
2 is a block diagram schematically illustrating the structure of a control system for establishing an SDN-based centralized WLAN network according to the present invention.
3 is a flowchart showing an initial setting operation flow of a control system for establishing an SDN-based centralized WLAN network according to the present invention.
4 is a diagram illustrating a signal flow of a control system for establishing an SDN-based centralized WLAN network according to the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various equivalents and modifications may be present.

Hereinafter, a control system for establishing an SDN based centralized WLAN network according to the present invention will be described with reference to the drawings.

FIG. 2 is a diagram schematically showing a structure of a control system for establishing an SDN-based centralized WLAN network according to the present invention.

The present invention basically comprises a wireless SDN-AP (Software Defined Network-Access Pointer) 100 and a smart SDN controller 200.

More specifically, the wireless SDN-AP 100 includes a data path (Data Path: 1) for enabling network communication between any one or more basic data services selected from the Internet and a packet forwarding service, The Smart SDN controller 200 provides a control path (Control Path) 2 for performing an additional data service except for the basic data service through a separate authentication procedure. The Smart SDN controller 200 provides the SDN-AP 100 with the SDN protocol To allow network communication of the additional data service via the control path 2. [

The SDN-AP 100 includes a driver module including at least one of an Ethernet driver and a hardware interface driver, a common driver interface, a data service ), A wireless LAN driver (WLAN Driver), and a packet forwarding engine (Packet Forwarding Engine) to form an infrastructure layer, while being operated under an Open API (Application Programming Interface) Only the data of the control path 2 can be communicated to the smart SDN controller 200 through the Open Agent module 101. [

In order to communicate with the SDN-AP 100 as described, the smart SDN controller 200 includes a control layer and a network function for interfacing with the Open Agent module 101 of the SDN- And an application layer for virtual implementation.

When the connection establishment of the smart SDN controller 200 is completed through the control path 2, the supplementary data service is started after the data table of the packet forwarding engine is updated to the smart SDN controller 200, Includes at least one of Network Address Translation (NAT), Dynamic Host Configuration Protocol (DHCP), Virtual Local Area Network (VLAN), Service Set Identifier (SSID), Security, Remote Access and Internet Group Management Protocol (IGMP) And IGMP means broadcasting function service.

The conventional SDN controller commands the wireless AP, and the wireless AP performs processing such as transmitting, modifying, or discarding the packet to the destination according to the command, and adding the SDN protocol as firmware to the wireless AP to configure the wireless SDN-AP The controller is implemented in software. The controller based on the SDN protocol transmits the packet forwarding method and the VLAN priority value to the switch.

The conventional wireless AP inquires the controller about the failure information and the information about the packet which does not have the path information registered in advance, and receives and processes the decision. Most of the conventional SDN controller main role is for the path calculation. The path information is received by the SDN wireless AP device through a secure channel or a TCP connection of the transport layer, stores the path information in a table form, checks the flow table every time data is received thereafter, and transmits the frame to the designated path As described above, there is a real problem in applying the SDN technology of the known operation mode to the present wireless AP device. Therefore, the spread of the SDN technology is limited, When implementing a controllable WLAN network, existing network technologies or current That it give up all of the content that make up the Internet at the same time it is also unrealistic.

In order to solve the problems of the conventional SDN technology, the smart SDN controller 200 in the structure of the present invention can be applied to the application and maintenance monitoring for the additional data service defined above without an application for path calculation, Lt; / RTI >

A conventional data path 1 for providing a basic data service and a control path 2 for setting an additional data service are separated in the wireless SDN-AP 100 when the driver and the firmware are implemented. Only the control information data of the smart SDN controller 100 is connected to the Resource Control Open API of the smart SDN controller 200 through the SDN protocol through the Open Agent module 101 of the wireless SDN- It is implemented as a virtualization module so that anyone can easily add or delete programs by using Application Control Open API.

In addition, the smart SDN controller 200 includes a virtual NOS (Network Operating System), an Open API, and a network function virtualization module for interfacing with the wireless SDN-AP 100, and the basic data service includes a data path 2 As described above, when the setting of the additional data service is completed in the smart SDN controller 200 through the control path 2 after the user is authenticated through the authentication procedure, various tables of the packet forwarding engine (ex: Packet forwarding Table, NAT Table, IGMP Table, etc.) are updated.

The NOS of the wireless SDN-AP 100 becomes a light NOS that is lighter than the NOS of the conventional wireless AP by setting and monitoring the supplementary data service including the broadcasting function service in the smart SDN controller 200, 100 and the interface with the smart SDN controller 200 is implemented in the Open Agent module 101 under the Open API and the Open Agent module 101 includes various SDN protocols .

As described above, according to the present invention, in applying the SDN technology to the wireless AP, the control and security-related part and the maintenance management part of the existing wireless AP are implemented in the smart SDN controller 200, The wireless SDN-AP 100 can separate the network control unit and the maintenance management unit from each other by the method implemented in the wireless SDN-AP 100, integrate them into the smart SDN controller 200 and virtualize them, AP 100, it is possible to eliminate the concern about the latency due to the virtualization of the routing functions that are concerned with the current SDN technology.

Also, by leaving the network functions for the conventional basic data service in the wireless SDN-AP 100, even if the wireless SDN-AP 100 is disconnected from the smart SDN controller 200, the wireless SDN- The smart SDN controller 200 can change the operation mode according to the traffic characteristics while separately providing the additional data service according to the subscriber service level when the subscriber accepts the subscriber. .

Here, the basic data service is a service that can be immediately provided to the user even if the wireless SDN-AP 100 is not connected to the smart SDN controller 200, and the wireless SDN- When the smart SDN controller 200 determines that the user has a service level, the smart SDN controller 200 performs a setup procedure in the wireless SDN-AP 100, The various functions of the SDN-AP 100 are set to be able to provide the additional data service requested by the user.

FIG. 3 is a flowchart illustrating an initial setting operation flow of a control system for establishing an SDN-based centralized WLAN network according to the present invention.

Hereinafter, a flow of an initial setting operation of a control system for establishing an SDN-based centralized WLAN network according to the present invention will be described with reference to FIG.

When data is input (S02) to the wireless SDN-AP 100 and data is simultaneously input to the wireless SDN-AP 100 when the wireless SDN-AP 100 is powered on or a new user's AP is registered The basic data service is activated (S03).

When the wireless SDN-AP 100 successfully performs a process for connecting to the smart SDN controller 200 (S04), the smart SDN controller 200 determines whether the user of the wireless SDN- (S05) to the subscriber identity server if it is a service user, then the user data service waits for a while and the smart SDN controller 200 starts the setting (S06) of the wireless SDN-AP 100 do.

When the smart SDN controller 200 starts setting up the supplementary service of the wireless SDN-AP 100, it transmits a function set in message to the peripheral controller and the wireless SDN-AP 100 (S07). The reason for transmitting the message to the neighboring controller is to prevent another controller from doubly accessing the wireless SDN-AP 100.

The smart SDN controller 200 creates a Set entry for setting an additional data service function of the wireless SDN-AP 100 (S08) and transmits the created Set entry to the wireless SDN-AP 100 by including it in a Network Modify message (S09). At this time, the SDN protocol and the Open Agent module 101 are used to communicate with each other.

After analyzing the Set entry of the received Network Modify message, the wireless SDN-AP 100 modifies various hardware tables of the packet forwarding engine by referring to a Set entry item (S11). The wireless SDN- 100 are activated (S12), and the additional data services that have been waiting are received data output and reception instructions (S13).

The data is transmitted to the destination (S17) by referring to the hardware table of the packet forwarding engine S16 without any further setting, and then the smart SDN controller 200 operates in the mode for monitoring the wireless SDN-AP 100 The wireless SDN-AP 100 provides a basic data service and an additional data service corresponding to the user's request (S18).

When the basic service is activated (S03) at the same time as the operation of the wireless SDN-AP (100), the basic data service is started (S14), and when receiving the output instruction (S15) for the basic data service, the packet forwarding engine The data is directly transferred to the destination (S17).

In the case of the additional data service including the broadcasting function service in the setting process, after the setting entry is instructed to the wireless SDN-AP 100 by the smart SDN controller 200 centralized along the control path 2, At the same time as the function setting is finished, the rest of the basic data service part operates according to the traditional distributed control method.

4 is a diagram illustrating a signal flow of a control system for establishing an SDN-based centralized WLAN network according to the present invention.

Hereinafter, a signal flow of a control system for establishing a centralized WLAN network based on SDN according to the present invention will be described with reference to FIG.

4, when the wireless SDN-AP 100 is turned on (F07) or the wireless SDN-AP 100 of a new user is registered (F08) in the smart SDN controller 200, FIG. 2 is a signal flow diagram between two devices, and shows a procedure up to transmission after receiving specific data from the wireless SDN-AP 100.

The basic data service is provided through the data path 1 immediately after powering up the wireless SDN-AP 100 (F07), and the additional data services are transmitted via the control path 2 to the smart SDN controller 200 After the setting instruction is given to the wireless SDN-AP 100 and the table of the packet forwarding engine is updated, the service of the additional service data waiting for a while is temporarily started. That is, even if the wireless SDN-AP 100 is not connected to the smart SDN controller 200, the basic data service is basically a service provided to the user when only power is turned on, and the supplementary data service including the broadcasting function service includes a wireless SDN After the APS 100 is connected to the smart SDN controller 200, the smart SDN controller 200 sends a setup instruction to the wireless SDN-AP 100 after confirming that the user is an additional service user through subscriber authentication, Lt; / RTI >

The wireless SDN-AP 100 inquires of the smart SDN controller 200 about the service use mode at the moment when the operation of the wireless SDN-AP 100 is started (F01) and a new frame that has not been received is received, The wireless SDN-AP 100 stores the supplementary data service to be provided to the user once and stores the supplementary data service requested by the user of the corresponding SDN-AP 100 in the smart SDN controller 200, Ask if there is an entry.

When the connection between the smart SDN controller 200 and the wireless SDN-AP 100 is established, the smart SDN controller 200 transmits a Network Modify message requesting the function registration, change or deletion of the function of the supplementary data service requested by the user to the wireless SDN To the AP 100, and instructs to integrate the setting entries.

In detail, even if the basic data service is not connected to the smart SDN controller 200 at the moment when the wireless SDN-AP starts to operate (F07), if the transmission / reception of the basic data service of the user is confirmed (F05) (F06) by referring to the hardware table of the Packet Forwarding Engine.

Then, if the user is an additional data service target, it is confirmed (F01) that the additional data service is disabled in the wireless SDN-AP 100, and then the user information data is transmitted to the smart SDN controller 200 (F02) (F08) the user's supplementary service history on the basis of the data, and instructs the wireless SDN-AP 100 to include the setting entry in the Network Modify message (F03).

Next, destination information for the additional data service that is waiting in the buffer of the wireless SDN-AP 100 is designated as a PacketOut message, and the frame stored in the buffer of the wireless SDN- When receiving the same data regardless of the basic data service or the additional data service type, the wireless SDN-AP 100 refers to the entry information stored in the hardware table of the packet forwarding engine, It is not necessary to inquire of the user 200.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, .

Claims (6)

A data path (Data Path: 1) that enables network communication of at least one of a basic data service over the Internet and a packet forwarding service, and a supplementary data service except for the basic data service, A wireless SDN-AP (Software Defined Network-Access Pointer) 100 for providing a control path (Control Path)
And a smart SDN controller 200 communicating with the wireless SDN-AP 100 through an SDN protocol to enable network communication of an additional data service through the control path 2,
The SDN-AP (100)
A driver module including at least one of an Ethernet driver and a hardware interface driver,
A firmware including at least one of a common driver interface, a data service, a WLAN driver, and a packet forwarding engine,
Communicates with the smart SDN controller 200 only on the data of the control path 2 through the Open Agent module 101 driven under the Open API (Application Programming Interface)
The smart SDN controller (200)
And a control layer for interfacing with the Open Agent module 101 of the SDN-AP 100 and an application layer for implementing network functions in a virtual manner. Control system for WLAN network construction.
delete delete delete The method according to claim 1,
The additional data service comprises:
When the connection establishment of the smart SDN controller 200 is completed through the control path 2, the data table of the packet forwarding engine is updated after being updated to the smart SDN controller 200, and then the SDN-based centralized WLAN network construction is started. Control system.
The method according to claim 1,
The additional data service comprises:
And includes at least one of Network Address Translation (NAT), Dynamic Host Configuration Protocol (DHCP), Virtual Local Area Network (VLAN), Service Set Identifier (SSID), Security, Remote Access and Internet Group Management Protocol (IGMP) A control system for establishing a centralized WLAN network based on SDN.

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