KR20070079464A - System for controlling traffic and method for ensuring quality of service thereof - Google Patents

Abstract

A traffic control system and a method for guaranteeing QoS(Quality of Service) thereof are provided to prevent traffic congestion and ensure QoS by enabling an edge router, which executes as proxy for QoS function of the DSLAM(Digital Subscriber Line Access Multiplexer) of a subscriber stage, to adjust the amount of traffic coming into the link between the modem and DSLAM of the subscriber block. A traffic control system is comprised of a QoS policy server(400), an edge router(240), a DSLAM(220), and a modem(210). The QoS policy server(400) executes authentication in response to an authentication request of a subscriber terminal(100), and determines a QoS policy by using subscriber access speed information for the subscriber terminal(100). The edge router(240). The edge router(240) applies the QoS policy, supplied from the QoS policy server(400), to the subscriber terminal(100). The DSLAM(220) doesn't comprise a DiffServ(Differentiated Service) function. The modem(210) establishes a link with the DSLAM(220), and transmits traffic to the subscriber terminal(100).

Description

Traffic control system and its quality of service (QOS) guarantees {SYSTEM FOR CONTROLLING TRAFFIC AND METHOD FOR ENSURING QUALITY OF SERVICE THEREOF}

1 is a schematic structural diagram of a traffic control system according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a QoS policy determination method of the QoS policy server of FIG. 1. FIG.

3 is a flowchart illustrating a method for guaranteeing QoS of the traffic control system of FIG. 1.

*** Explanation of symbols for the main parts of the drawing ***

100: subscriber terminal 200: Internet access network

210: Modem 220: DSLAM

230: internal access network 240: edge router

231, 232: Router 300: Internet Network

400: QoS policy server 410: access network information server

420: control server 430: authentication server 500: DHCP server 600: operating server

The present invention relates to a traffic control system and a method of guaranteeing a quality of service (hereinafter referred to as QoS), and more particularly, to a subscriber end modem and a digital subscriber line access multiplexer through an edge router. It is a technology that provides an optimal QoS by controlling the traffic volume between a line access multiplexer (hereinafter referred to as DSLAM).

In general, high-speed Internet service technology is a modem connected to a subscriber terminal such as a personal computer (PC) or a LAN card located in a subscriber's home, and a digital subscriber line access multiplexer (link) that transmits and receives traffic by connecting to a modem. Access Multiplexer (hereinafter referred to as DSLAM), which is provided between a subscriber access network and an Internet network, is implemented by an edge router that provides IP (Internet protocol) provision and service control provided by a high-speed Internet service provider.

The access protocol of the Internet network uses a DHCP (Dynamic Host Configuration Protocol) protocol between the subscriber and the network, and a DHCP server and an authentication server are connected to the Internet network for authentication and IP allocation, and the access technology is ADSL (Asymmetric). Various technologies are available, including Digital Subscriber Line (VDSL), Very High Data Rate Digital Subscriber Line (VDSL), and Ethernet.

Due to the increase in traffic and the increased use of current Internet services Internet network is experiencing chronic bottlenecks and congestion, and this is the degradation of QoS is emerging along.

QoS refers to guaranteeing the quality of communication in a network, and refers to various technologies and concepts for managing traffic and bandwidth in a limited WAN bandwidth by differentiating service levels according to importance for users or applications. In other words, QoS is a concept that guarantees service according to user's demand for communication quality such as bandwidth and speed.

In order to guarantee such QoS under an IP (internet protocol) based access network environment, a router that provides a differential service (DiffServ; Differentiated Service) has been conventionally used, but the conventional subscriber end DSLAM provides a differential service. There is a problem that the QoS guarantee at the subscriber end is difficult.

In other words, if traffic over a certain rate is introduced into a link established between a DSLAM and a modem in which a differential service is not provided, congestion occurs on the link, thereby making it difficult to guarantee QoS.

In order to solve the above problems, an object of the present invention is to ensure QoS by preventing traffic congestion by adjusting the amount of traffic entering the link between the modem and the DSLAM by substituting the QoS function of the DSLAM at the subscriber end. It is to make it possible.

In addition, another object of the present invention is to limit the nodes to be adjusted in order to change the access speed of the subscriber end to the edge router, and by applying the subscriber policy dynamically through the control server according to the service details of the subscriber, Internet service operation and To streamline and automate the provisioning process.

To this end, the traffic control system according to the present invention, after receiving the authentication request, QoS policy server for determining the service quality (hereinafter referred to as QoS) policy using the subscriber access rate information for the subscriber station after performing the authentication And an edge router for applying the QoS policy authorized from the QoS policy server to each subscriber station.

In addition, the QoS guarantee method of the traffic control system according to the present invention, the first process for requesting the IP allocation and the IP is assigned, and the agent for the authentication of the subscriber station corresponding to the IP by using the assigned IP information A second process of determining a quality of service (QoS) policy using the access speed information of each subscriber station and a fourth process of controlling the amount of traffic by applying a QoS policy of each subscriber station when authentication is completed. It is characterized by including.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic configuration diagram of a traffic control system according to an embodiment of the present invention.

In the present invention, the traffic control system includes a subscriber station 100, a subscriber access network 200, an internet network 300, a QoS policy server 400, a dynamic host configuration protocol (DHCP) server 500, and an operation server 600. It includes.

The subscriber station 100 subscribes to the Internet service product and requests an IP (internet protocol) assignment to the DHCP server 500 through the subscriber access network 200.

The subscriber access network 200 includes a modem 210, a digital subscriber line access multiplexer (hereinafter referred to as a DSLAM) 220, an internal access network 230, and an edge router 240. . The modem 210 is provided between the subscriber station 100 and the DSLAM 220 to establish a link with the DSLAM 220 when the power is turned on.

In addition, the DSLAM 220 receives the access signal from the subscriber station 100 and transmits the signal to the internal access network 230 using a multiplexing technique. At this time, the DSLAM 220 is a device that does not provide a QoS function.

The internal access network 230 is a network provided by an internet service provider and includes routers 231 and 232. At this time, the routers 231 and 232 are devices for concentrating the DSLAMs 220, and a differential service (DiffServ) function for QoS of the subscriber access network 200 is preferably set.

The edge router 240 serves to connect the internal access network 230 and the internet network 300 and is involved in authentication and IP allocation of the subscriber station 100. That is, the edge router 100 serving as an entry point of the Internet network allocates an IP address to a subscriber station to provide an IP interface for each subscriber and provides the Internet service only after authentication of the service provider for the interface. Perform.

In particular, the edge router 240 sniffs the DHCP packet of the subscriber station 100 to make an authentication request to the control server 420, and applies the QoS policy applied from the control server 420 to the DSLAM 220. Let's do it.

The access network information server 410 collects and stores the actual connection speed information of the link established between the modem 210 and the DSLAM 220 from the DSLAM 220, and transmits the collected information to the control server 420.

The authentication server 430 stores subscriber access rate information for each subscriber station 100, and when receiving an authentication request from the control server 420, performs authentication for the corresponding subscriber station 100, and when the authentication is completed, the corresponding subscriber station Subscriber access rate information for the 100 is transmitted to the control server 420.

The control server 420 substitutes for the authentication request of the subscriber station 100 through interaction between the edge router 240, the access network information server 410, and the authentication server 430, and receives the authentication server 430 from the authentication server 430. The QoS policy is set using the subscriber access rate information and the result is applied to the edge router 240. In addition, the control server 420 receives the connection speed information of the actual link of the access network information server 410 and transfers the information to the operation server 600.

In addition, the control server 420 analyzes the subscriber access rate information received from the authentication server 430 to obtain bandwidth information subscribed to by the traffic class, and the QoS policy to be applied to the edge router 240 based on the information. Determine.

The QoS policy configured by the control server 420 includes information on which traffic class the edge router 240 classifies packets destined for an IP of one subscriber station, and shaping the packets classified by traffic class by a predetermined amount. And limiting the amount of traffic in the same manner as rate limiting and adjusting the amount of traffic according to the priority of each traffic class.

If the sum of the bandwidths of the subscriber-subscribed traffic classes is greater than the actual connection speed of the link established between the modem 210 and the DSLAM 220, the bandwidth of the low priority traffic class is preferentially reduced, and the traffic class by traffic class. The QoS policy is determined so that the sum of the limited amount of traffic is not greater than the actual connection speed of the link established between the modem 210 and the DSLAM 220, and the operation server 600 is notified of the fact.

In this case, a policy for classifying packet traffic classes may be arbitrarily determined according to QoS services to be provided in an access network.

When the DHCP server 500 receives the IP allocation request from the subscriber station 100, the DHCP server 500 allocates an IP to the corresponding subscriber station 100 through the edge router 300.

The operation server 600 uses the actual connection speed information of the link received from the control server 420 to replace the corresponding line or amplify the band to physically improve the connection speed when the actual connection speed is low, or to the subscriber. Providing services such as informing information.

In the traffic control system of the present invention having the above configuration, when the modem 210 is powered on, a link is established between the modem 210 and the DSLAM 220 to connect the edge router 240 from the DHCP server 500. IP communication is performed after authentication is performed through IP assignment. At this time, the edge router 240 sniffs the IP and requests the authentication of the terminal to the control server 420, and when the authentication is completed, the control server determines the Qos policy using the subscriber access speed information to determine the edge router 240. ) Is applied. Accordingly, edge router 240 applies the QoS policy for each subscriber station IP.

With this QoS policy applied, the edge router 240 prioritizes packets when more traffic enters the edge router 240 than the link from the DSLAM 220 to the modem 210 can accommodate. Drops to match ranking and subscribed bandwidth reduce congestion by reducing the amount of traffic that the link can accommodate.

2 conceptually illustrates such a QoS policy, the contents of which are as follows.

According to FIG. 2, the block indicated by a dotted line divides a policy applied to packets of each subscriber station. As described above, each block limits the bandwidth for each traffic class as subscribed by the subscriber and schedules the traffic according to the priority of the traffic class. Packets processed through each block are combined in a queue of ports connected from the edge router to the subscriber access network and scheduled according to priority. The policy of classifying packets by traffic class is applied at the front of the block indicated by the dotted line.

Hereinafter, a method for guaranteeing QoS of the traffic control system of the present invention will be described with reference to FIG. 3.

First, when the subscriber station 100 requests IP allocation to the DHCP server 500 through the edge router 240 for internet access (S101), the DHCP server 500 receives the subscriber station through the edge router 240 ( 100 is allocated to the IP (S102).

At this time, the edge router 240 sniffs the IP packet transmitted from the DHCP server 500, and requests the authentication server 430 to authenticate the terminal 100 (S103).

Accordingly, the authentication server 430 performs authentication (S104), and when authentication is completed, the authentication server 430 sends the subscriber access rate information corresponding to the stored authentication request terminal 100 to the control server 420. Transfer (S105).

Thereafter, the control server 420 requests the link actual speed information between the modem 210 and the DSLAM 220 to the access network information server 410 (S106), and the access network information server 410 stores the corresponding terminal ( The actual speed information of the link between the modem 210 and the DSLAM 220 connected to 100 is transmitted to the control server 430 (S107). At this time, the access network information server 410 collects and stores the actual speed information of the link between the modem 210 and the DSLAM 220 from the DSLAM 220.

Accordingly, the control server 420 determines the QoS policy using the subscriber access rate information received from the authentication server 430 (S108), transfers the determined QoS policy to the edge router 240, and the edge router 240 ) Restricts or increases the bandwidth of the subscriber end by applying the QoS policy for each subscriber IP (S109).

On the other hand, although not shown in FIG. 3, the control server 430 transmits the actual speed information received from and the access network information server 410 to the operation server 600, whereby the operation server 600 is subsequently added to the actual speed information. Take action accordingly.

As such, the present invention applies the QoS policy to the DSLAM 220 at the subscriber end through the edge router 240 to adjust the amount of traffic entering the DSLAM 220 without the differential service function at the edge router 240. To ensure QoS.

The present invention as described above has the effect of guaranteeing QoS even if the DSLAM does not provide the QoS function by dynamically controlling the traffic of the link between the modem and the DSLAM by substituting the QoS function of the subscriber-end DSLAM in the edge router.

In addition, the present invention excludes the speed control function of the DSLAM, and by controlling the subscriber speed dynamically at the subscriber access point in the edge router, there is an effect that can streamline and automate the Internet service operation process.

In addition, a preferred embodiment of the present invention is for the purpose of illustration, those skilled in the art will be able to various modifications, changes, replacements and additions through the spirit and scope of the appended claims, such modifications and changes are the following claims It should be seen as belonging to a range.

Claims (11)

A QoS policy server for determining a quality of service (hereinafter referred to as QoS) policy by performing subscriber authentication and then performing authentication when using an authentication request; And And an edge router for applying the QoS policy authorized by the QoS policy server for each subscriber station. The method of claim 1, A digital subscriber line access multiplexer (DSLAM) having no differential service function; And And a modem for establishing a link with the digital subscriber line access multiplexer and transmitting traffic to the subscriber station. The method of claim 2, wherein the edge router, And a preconditioning amount of traffic flowing from the digital subscriber line access multiplexer to the modem at an entry point. The method of claim 2, wherein the QoS policy server, An authentication server that performs authentication upon receiving an authentication request of a predetermined subscriber station and outputs subscriber access rate information corresponding to the subscriber station when the authentication is completed; And And a control server that substitutes an authentication request to the authentication server upon receiving the authentication request from the edge router and determines a QoS policy using the subscriber access rate information. The method of claim 4, wherein And an access network information server for collecting and storing link actual connection speed information between the modem and the digital subscriber line access multiplexer from the digital subscriber line access multiplexer. The method of claim 5, And an operation server configured to receive the actual access speed information from the access network information server, to expand a line, or to inform the subscriber of the actual access speed information. A first step of requesting an IP allocation to receive the IP; A second step of performing authentication of the subscriber station corresponding to the IP by using the allocated IP information; A third step of determining a quality of service (hereinafter referred to as QoS) policy by using subscriber access rate information for each subscriber station when the authentication is completed; And And a fourth process of controlling the amount of traffic by applying the QoS policy for each subscriber. The method of claim 7, wherein the third process, The QoS policy is configured to limit the amount of traffic by shaping or rate limiting by a predetermined amount for each traffic class according to the subscriber access rate information, and to adjust the amount of traffic according to the priority of each traffic class. QoS guarantee method of a traffic control system, characterized in that for determining. The method of claim 8, wherein the fourth process, And controlling the amount of traffic entering the digital subscriber line access multiplexer by applying the QoS policy for each subscriber station IP through an edge router. The method of claim 9, And a fifth process of collecting actual speed information of a link established between the modem connected to the subscriber station and the digital subscriber line access multiplexer. The method of claim 10, And a sixth process of notifying the actual speed information to the subscriber station and the circuit extension by using the actual speed information.

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