KR101480059B1 - Method for Transmiting Data Packet, System, Service Box Apparatus And Access Box Apparatus Therefor - Google Patents

Abstract

The present invention relates to a data packet transmission method and a system therefor, a service box device, and an access box device.

A first response message transmission unit transmits a first response message to a data packet received from an information providing server. A transmission rate calculation unit for calculating a transmission rate to the terminal based on a round trip time (RTT) to a terminal and a receiver window size (RWND) for an access box apparatus; And a service box data packet transmitter for transmitting a data packet buffered according to the calculated transmission rate to the terminal via the access box device.

According to the present invention, there is an advantage that TCP can be improved only by adding a service box device and an access box device without affecting existing wired / wireless communication devices. Also, FAST TCP can automatically And can adapt to the characteristics of the network.

TCP, data packet, round trip time, recipient window

Description

TECHNICAL FIELD The present invention relates to a data packet transmission method and a system, a service box device, and an access box device for the same,

The present invention relates to a data packet transmission method and a system therefor, a service box device, and an access box device. More particularly, the present invention relates to an improvement of TCP performance by using a service box device and an access box device, and it is an object of the present invention to solve the problems of the related art that do not properly support characteristics in a wireless link in which a situation changes dynamically, The transmission rate to the terminal is calculated based on the round trip time (RTT) and the receiver window size (RWND) of the access box device, and the buffered data packet is transmitted according to the calculated transmission rate A service box device and an access box device for the data packet transmission method.

TCP (Transport Control Protocol) is a method for reliably transmitting data of a sender to a receiver. After the activation of the Internet, the performance of TCP has been continuously improved.

In the case of the wired network, there is a characteristic that the communication rate of the communication link is small, there is no mobility, the transmission delay is relatively small and the change is small and the high speed communication is possible. In the case of the wireless network, The transmission speed is variable, the instability of the communication link due to mobility and the like is high, and the transmission delay is higher than that of the cable.

Therefore, the TCP performance improvement in the conventional wired network has been aimed to solve the congestion interval control in the traffic concentration region, and the wireless has been aimed at improving the performance in the variable and error rate situations .

However, researches that distinguish between wired and wireless have evolved into research on wired / wireless integrated services and networks as the wired / wireless integrated environment has recently emerged and the environment providing the same services in wired and wireless has arrived.

Among the measures for the conventional wired / wireless integrated services, the best way to provide the best performance is to use the error recovery function, which improves the performance by preventing the error of the wireless link from being seen at the wired terminal, and the TCP There was a technique that used an acceleration algorithm together.

However, if the conventional technology is relatively fast and there is little change in the network environment, the network can be maintained at a certain level, thereby achieving high efficiency. However, if the transmission speed of the transmission line is erroneously determined or the network environment changes, Is generated.

DISCLOSURE OF THE INVENTION In order to solve the above-described problems, the present invention is an invention for improving TCP performance by using a service box device and an access box device, and it is an object of the present invention to solve the problems of the prior art The transmission rate to the terminal is calculated on the basis of the round trip time (RTT) to the terminal and the receiver window size (RWND) of the access box device, A data packet transmission method capable of transmitting a buffered data packet to a terminal, and a system, a service box device and an access box device for the same.

According to an aspect of the present invention, there is provided an information providing server comprising: a first response message transmitting unit for transmitting a first response message to a data packet received from an information providing server; A transmission rate calculation unit for calculating a transmission rate to the terminal based on a round trip time (RTT) to a terminal and a receiver window size (RWND) for an access box apparatus; And a service box data packet transmitter for transmitting a data packet buffered according to the calculated transmission rate to the terminal via the access box device.

According to another aspect of the present invention, there is provided an access box data packet transmission system comprising: an access box data packet transmission unit for buffering a data packet received from a service box apparatus and transmitting the buffered data packet to a terminal according to a transmission rate calculated by the service box apparatus; And a receiver window modifying unit for modifying the receiver window size of the data packet to be transmitted with the reception buffer size.

According to another aspect of the present invention, there is provided a data packet transmission method including: a data packet transmission step of transmitting a data packet in an information providing server; A first response message transmission step of transmitting a first response message for the data packet from the service box device to the information providing server; A transmission rate calculation step of calculating a transmission rate to the terminal based on a round trip time (RTT) from the service box device to a terminal and a receiver window size of an access box device (RWND); And a data packet transmission step of buffering a data packet received from the access box device and transmitting the data packet to the terminal according to the calculated transmission rate.

According to another aspect of the present invention, when a data packet is received from an information providing server, the round trip time (RTT) to the terminal and the receiver window size of the access box device (RWND) Wherein the round trip time of the data packet corresponding to the second response message is updated when the second response message for the data packet is received and the round trip time of the data packet corresponding to the second response message is updated, A service box apparatus for updating a transmission rate to the access box apparatus based on a receiver window size and controlling traffic received from the information providing server by controlling the first response message according to a reception buffer size; And transmitting the data packet to the terminal according to the calculated transmission rate, modifying a receiver window size of the data packet to a reception buffer size, and receiving a retransmission request due to an error of a wireless link from the terminal, And an access box device for retransmitting the data packet through a recovery algorithm and transmitting the second response message for the data packet to the service box device.

As described above, according to the present invention, when the round trip time (RTT) from the service box device to the terminal and the receiver window size of the access box device (RWND) It is possible to calculate the transmission rate and transmit the buffered data packet to the terminal according to the calculated transmission rate.

In addition, according to the present invention, it is possible to improve the performance of wired / wireless integrated services based on TCP by applying to femtocell based on xDSL / FTTH, wired access network, WLAN, wireless LAN, WPAN and the like.

In addition, according to the present invention, there is an advantage that the performance of TCP can be improved only by adding the service box device and the access box device without affecting the existing wired / wireless communication devices, and the information about the network Even if you do not have the effect of automatically adapt to the characteristics of the network.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected."

1 is a block diagram schematically showing a data packet transmission system according to the present embodiment.

The data packet transmission system according to the present embodiment is based on TCP (Transport Control Protocol) and includes a terminal 110, an access point (AP) 120, an access box device 130, a switch 140, An information providing server 160, and a service box device 162. The information providing server 160,

The terminal 110 refers to all kinds of terminals capable of performing voice communication or data communication in a wireless communication.

For example, the terminal 110 may be a personal digital assistant (PDA), a cellular phone, a personal communication service (PCS) phone, a hand-held PC, a CDMA-2000 phone, a WCDMA phone, ), PSP (PlayStation Portable) and MBS (Mobile Broadband System) phones.

The AP 120 is a device for connecting data communication. It is a device that reads a receiving side address from a transmitting side information, designates a most suitable communication path, and transmits the same to another communication network. That is, the AP 120 extracts the location of the data packet, specifies the best communication path to the extracted location, directs the data packet to the next device along the designated communication path, It can also be shared.

In this embodiment, the AP 120 can be used as a concept including a router, a repeater, a repeater, and a bridge. Preferably, the AP 120 includes a Node B, an RNC ), Serving GPRS Support Node (SGSN), and Gateway GPRS Support Node (GGSN).

The access box device 130 according to the present embodiment buffers a data packet received from the service box device 162 and transmits it to the terminal according to the transmission rate calculated by the service box device 162, And performs a function of modifying the recipient window size of the data packet to be transmitted.

In addition, the access box device 130 is an apparatus that can improve the performance of the wired network by assisting the service box device 162 while assuring the independence of the TCP performance from the access network and eliminating the performance degradation factor occurring in the access network .

In addition, the access box device 130 operates with parameters appropriate to the characteristics of the access network, providing optimized performance for each access network technology, and serving as a point of contact that can provide TCP performance independently to the access network.

The access box device 130 may be applied to all access technologies such as a public wireless network (WCDMA / HSPA), WLAN, Bluetooth, 3G, 4G, M-WiMAX, DSL and FTTH.

In addition, the access box device 130 can dynamically predict the speed information of the access network to perform optimal traffic supply. For example, in the case of 3G public network, it is located behind the GGSN equipment and can act as a contact point for an ISP or an application server and a wireless network contact point. The same technology can be applied to xDSL / FTTH based femtocell, wired access network, wireless LAN, WPAN and so on.

In addition, the access box device 130 provides wireless link performance improvement and flow control function with the traffic source as an error recovery algorithm in the function of supporting the radio access network, and can also use a snoop have.

In addition, the access box device 130 may control the flow based on the service box device 162 and the wireless network speed, and may provide a traffic shaping function to the access network. In the future, It can also be applied to support functions and TCP performance improvement for mobile objects.

The switch 140 refers to a device that switches data communication to a network or a server.

The Internet 150 is a network capable of transmitting and receiving Internet contents (packet data) using an Internet protocol using various wired and wireless communication technologies such as an intranet network, a mobile communication network, and a satellite communication network.

The Internet network 140 may be a closed network such as a LAN (Local Area Network) or a WAN (Wide Area Network) as a network connecting the user terminals 112, desirable. The Internet can be divided into several services, such as HyperText Transfer Protocol (HTTP), Telnet, File Transfer Protocol (FTP), Domain Name System (DNS), Simple Mail Transfer Protocol (SMTP) Simple Network Management Protocol (NFS), Network File Service (NFS), and Network Information Service (NIS).

As shown in FIG. 1, the information providing server 160 can be divided into a communication user information providing server and a third party information providing server, but this embodiment will be described as an information providing server for convenience of explanation.

Although the information providing server 160 has the same hardware configuration as a typical web server, the information providing server 160 may be implemented in any language such as C, C ++, Java, Visual Basic, and Visual C And a program module that performs various functions.

In addition, the information providing server 160 may be implemented in the form of a web server. The web server is generally connected to an unspecified number of clients and / or other servers through an open computer network such as the Internet, Or a computer system (web server program) installed therein for receiving a request to perform an operation of another web server and deriving a result of the operation.

However, in addition to the above-described web server program, it should be understood as a broad concept including a series of application programs running on a web server and various databases built in the case.

The information providing server 160 may be provided with a web server program which is variously provided according to an operating system such as DOS, Windows, Linux, UNIX, Macintosh, (Internet Information Server) used in a window environment, CERN, NCSA, and APPACH used in a UNIX environment can be used as typical examples.

That is, the information providing server 160 transmits a TCP / IP data packet to the terminal 110.

The service box device 162 according to the present embodiment transmits a first response message for the data packet received from the information providing server 160 and transmits a round trip time (RTT) to the terminal 110 ) And the size of a receiver window (RWND) for the access box device, and the buffered data packet is transmitted to the terminal 110 via the access box device 130 according to the calculated transmission rate To the terminal (110).

When receiving the second response message for the data packet from the access box device 130, the service box device 162 updates the round trip time of the data packet corresponding to the second response message, and updates the round trip time And the transmission window size to the access box device 130 based on the receiver window size.

In this embodiment, the service box device 162 is included in the information providing server 160 as shown in FIG. 1, but in actual implementation, the service box device 162 is connected to the Internet network 150 And can also be used for communication with wired and wireless Internet user terminals and mobile communication user terminals.

In addition, the service box device 162 according to the present embodiment ensures radio performance independence from the IP network and the third party ISP / ASP. The service box device 162 supports a kind of TCP virtual terminal role in which traffic to be transmitted to the terminal 110 is always accumulated in the wireless network. In addition, the service box device 162 is a stand-alone box that always keeps traffic on the network under the control of the access box device 130 and is located at a provider application server or a third party ISP side, , Loss due to errors, round trip time variation, and the like can be eliminated.

2 is a block diagram schematically showing a service box apparatus according to the present embodiment.

The service box apparatus 162 according to the present embodiment includes a first response message transmission unit 210, a transmission rate calculation unit 220, a service box data packet transmission unit 230 and a transmission rate update unit 240 .

The service box device 162 includes only the first response message transmission unit 210, the transmission rate calculation unit 220, the service box data packet transmission unit 230 and the transmission rate update unit 240 It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention, The present invention can be variously modified and modified.

The first response message transmission unit 210 transmits a first response message to the data packet received from the information providing server 160.

The first response message transmission unit 210 controls the traffic received from the information providing server 160 by controlling the first response message according to the reception buffer size.

The first response message transmission unit 210 interrupts transmission of the first response message and controls traffic inflow from the information providing server 160 when the size of the receive buffer increases beyond a predetermined size.

The transmission rate calculator 220 calculates the transmission rate to the terminal 110 based on the round trip time to the terminal 110 and the receiver window size for the access box device.

The service box data packet transmission unit 230 transmits the buffered data packet according to the calculated transmission rate to the terminal 110 via the access box apparatus 130.

Upon receiving the second response message for the data packet from the access box device 130, the transmission rate update unit 240 updates the round trip time of the data packet corresponding to the second response message, and updates the round trip time And updates the transmission rate to the access box device 130 based on the receiver window size.

The service box data packet transmission unit 230 transmits the buffered data packet to the terminal 110 via the access box apparatus 130 according to the updated transmission rate.

The transmission rate update unit 240 receives a value obtained by converting the size of the recipient window secured on the basis of the second response message into the size of the reception buffer of the access box apparatus 130 and a response message to the data packet transmitted to the terminal 110 The updated transmission rate based on the arrival time, the sensitivity factor of the reception buffer of the access box device 130, and the weight of the link and the buffer status of the RAN / CN (RAN / CN) And performs the function of acquiring.

The transmission rate update unit 240 calculates the updated transmission rate according to Equation (1).

In Equation (1), RWND size is a value obtained by converting the receiver window size to the reception buffer size of the access box device 130, RTT is a time at which a response message for a data packet transmitted to the terminal 110 arrives, TE_alpha is TE_beta is a weight for reflecting the buffer status of the radio link and the radio access network / control node (RAN / CN).

That is, the service box device 162 internally manages the round-trip time and the receiver window size for each TCP session. Here, the round trip time indicates a time at which the second response message to the service box device 162 arrives at the service box device 162 after the data packet is transmitted from the service box device 162 to the terminal 110, Means the value obtained by converting the size of the recipient window of the message transferred from the terminal 110 to the service box device 162 in the access box device 130 into the receive buffer size of the access box. That is, the service box device 162 calculates the transmission rate of the data packet to the terminal 110 as shown in Equation (1).

In Equation (1), TE_alpha and TE_beta are parameters for traffic engineering. TE_alpha is a parameter for allowing the access box device 130 to accumulate enough traffic to transmit through the wireless link as a sensitivity-factor for flow control to the buffer of the access box device 130. [ This can be optimized for the target network by setting the receiver window size and round trip time as specific values. TE_beta is a weight for reflecting the state of the radio link and the radio access network / control node (RAN / CN) itself buffer. When the FER increases or a congestion period occurs in the radio access network / control node, It is a value to be reflected in calculation. For example, if a target network such as 3G is defined, an optimal value can be defined for the target network. For ease of operation, (TE_alpha ÷ TE_beta) can be converted into a single TE_factor and used. In other words, it is also possible to operate by replacing two numbers multiplied by a denominator and a fraction by one number.

3 is a block diagram schematically showing an access box apparatus according to the present embodiment.

The access box device 130 according to the present embodiment includes an access box data packet transmission unit 310, a receiver window correction unit 320 and a second response message transmission unit 330.

The access box device 130 includes only the access box data packet transmission unit 310, the receiver window correction unit 320 and the second response message transmission unit 330. However, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention, Various modifications and variations will be possible.

The access box data packet transmission unit 310 performs a function of buffering the data packet received from the service box apparatus 162 and transmitting the data packet to the terminal 110 according to the transmission rate calculated by the service box apparatus 162 .

The access box data packet transmission unit 310 performs a function of retransmitting a data packet through an error recovery algorithm when receiving a retransmission request due to an error of a wireless link from the terminal 110. [

The recipient window modification unit 320 functions to modify the recipient window size of the data packet to be transmitted in the reception buffer size.

The second response message transmission unit 330 transmits a second response message to the service box device 162.

4 is a flowchart illustrating a data packet transmission method according to the present embodiment.

The information providing server 160 transmits the data packet to the service box device 162 (S410).

That is, when the information providing server 160 is an FTP / Web server, the FTP / Web server transmits a data packet via TCP / IP.

The service box device 162 transmits a first response message for the data packet to the information providing server (S420).

The service box device 162 can temporarily suspend the transmission of the first response message and adjust the traffic inflow from the information providing server if the reception buffer increases beyond a certain size.

That is, by transmitting the first response message for the data packet received via TCP / IP received from the FTP / Web server (information providing server) by the service box device 162, the service box device 162 virtually provides the information End-to-end session between the server 160 and the service box device 162.

In this case, if the reception buffer of the service box device 162 increases to a certain size or more, the transmission of the first response message may be interrupted temporarily to control the traffic inflow from the FTP / Web server.

The service box device 162 calculates the transmission speed to the terminal based on the round trip time to the terminal and the receiver window size of the access box device (S430).

The access box device 130 buffers the data packet received from the service box device 162 and transmits it to the terminal 110 according to the calculated transmission rate (S440).

At this time, the terminal 110 may request retransmission of the data packet to the access box device 130 when a radio link error occurs.

That is, the service box device 162 calculates the transmission speed to the terminal based on the round trip time to the terminal 110 and the receiver window size of the access box device 130. The service box device 162 buffers the TCP / IP data packet and transmits it to the access box device 130.

The access box device 130 receives and buffers the data packet from the service box device 162 and transmits it to the terminal 110.

The terminal 110 may transmit a second response message for the received TCP / IP data packet to the access box device 130, and may request retransmission of the TCP / IP data packet when an error occurs in the wireless link.

The access box device 130 modifies the receiver window size of the data packet to be transmitted in the reception buffer size (S450).

The access box device 130 also receives the data packet from the service box device 162 and transmits a second response message to the service box device 162 when the data packet is transmitted to the access box device 130 in the receive buffer size The recipient window size of the data packet can be modified.

When the access box device 130 receives a retransmission request due to an error of the wireless link from the terminal 110, it can retransmit the data packet through the error recovery algorithm.

That is, when the access box device 130 transmits the second response signal to the service box device 162, it modifies the receiver window top of the TCP / IP data packet to be transmitted to the receiving buffer size of the access box device 130. [ At this time, if there is a retransmission request from the terminal 110 due to an error of the wireless link, the access box device 130 can retransmit the data packet through the Snoop algorithm which is an error recovery algorithm.

The access box device 130 transmits a second response message for the data packet received by the service box device 162 (S460).

That is, the access box device 130 transmits the data packet to the terminal 110, receives the second response message for the data packet from the terminal, and transmits the second response message to the service box device.

The service box device 162 updates the round trip time of the data packet corresponding to the second response message and updates the transmission rate to the access box device 130 based on the updated round trip time and the received recipient window size (S470).

That is, when the second response message arrives for the virtually end-of-TCP session, the service box device 162 updates the round-trip time for the TCP / IP data packet for the message, and based on the received recipient window size To update the transmission rate to the access box device 130. [

4, it is described that the service box device 162, the access box device 130 and the terminal 110 sequentially execute steps S410 to S470. However, this is merely illustrative of the technical idea of this embodiment Those skilled in the art will recognize that the service box device 162, the access box device 130 and the terminal 110 may be arranged in the order described in FIG. 4, without departing from the essential characteristics of the present embodiment, 440 or steps S410 through S470 in parallel, so that it is not limited to the time-series order in Fig.

As described above, the data packet transmission method according to the present embodiment described in FIG. 4 can be implemented as a program and recorded in a computer-readable recording medium.

A program for implementing the data packet transmission method according to the present embodiment is recorded and the computer-readable recording medium includes all kinds of recording devices for storing data that can be read by the computer system.

Examples of such computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and also implemented in the form of a carrier wave (e.g., transmission over the Internet) . The computer readable recording medium may also be distributed over a networked computer system so that computer readable code is stored and executed in a distributed manner.

In addition, functional programs, codes, and code segments for implementing the present embodiment can be easily inferred by programmers in the technical field to which the present embodiment belongs.

5 is a flowchart illustrating a method of storing a data packet transmission time in a table according to an embodiment of the present invention.

The service box device 162 calculates the transmission speed to the terminal based on the round trip time to the terminal and the receiver window size of the access box device

When the transmission speed is calculated, the service box device 162 drives a timer for transmitting the data packet to the access box device 130 on a predetermined time basis (S510).

In addition, the service box device 162 may calculate the updated transmission rate by Equation (1) and then drive the timer by a predetermined time unit.

The service box device 162 confirms whether or not the data packet to be transmitted is buffered (S520).

That is, when the timer of the service box device 162 arrives, the service box device 162 checks the buffer and checks whether the data packet to be transmitted is buffered.

As a result of checking in step S520, if the data packet to be transmitted is buffered, the service box device 162 transmits the data packet to the access box device 130, The transmission time is stored in the table (S530).

That is, if the data packet is buffered, the service box device 162 transmits the data packet.

The service box device 162 transmits the data packet to the terminal 110 according to the updated transmission rate. At this time, in order to calculate the round trip time to the terminal, the transmission time of the corresponding data packet is stored in the table.

If the data packet to be transmitted remains in the buffer, the service box device 162 restarts the timer (S540).

5, it is described that the service box device 162 sequentially executes steps S510 to S540. However, this is merely illustrative of the technical idea of the present embodiment. It will be understood by those skilled in the art that the service box device 162 may be implemented by changing the order described in FIG. 5 or executing one or more of steps S510 to S540 in parallel, without deviating from the essential characteristics of the embodiment It will be understood that the invention is not limited to the above-described embodiments.

As described above, the method of storing the data packet transmission time in the table according to the present embodiment described in FIG. 5 can be implemented by a program and recorded in a computer-readable recording medium.

A program for implementing the method of storing the data packet transmission time in the table according to the present embodiment is recorded and the computer-readable recording medium includes all kinds of recording devices for storing data that can be read by the computer system .

Examples of such computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and also implemented in the form of a carrier wave (e.g., transmission over the Internet) . The computer readable recording medium may also be distributed over a networked computer system so that computer readable code is stored and executed in a distributed manner.

In addition, functional programs, codes, and code segments for implementing the present embodiment can be easily inferred by programmers in the technical field to which the present embodiment belongs.

6 is a flowchart for explaining a method of updating the transmission rate according to the present embodiment.

The service box device 162 transmits the data packet to the terminal 110 via the access box device 130 (S610).

The service box device 162 confirms whether a second response message for the data packet is received from the terminal 110 (S620).

If it is determined in step S620 that the second response message for the data packet is received from the terminal 110, the service box device 162 reads the recipient window size of the second response message, Updates the round trip time to the terminal 110 based on the transmission time and the reply time of the second response message (S630).

The service box device 162 receives the second response message from the terminal 110 to calculate the round trip time from the service box device 162 to the terminal 110 and calculates the round trip time from the service box device 162 to the terminal window size To calculate the update transmission rate.

The service box device 162 updates the transmission rate to the access box device 130 based on the updated round trip time and the receiver window size (S640).

The service box device 162 can update the receiver window size of [Equation 1] by reading the receiver window size for the received second response message, and the transmission time of the data packet returned by the second response message can be updated To update the round trip time to the terminal 110, and to calculate the updated transmission speed based on the updated recipient window size and the round trip time.

6, it is described that the service box device 162 sequentially executes steps S610 to S640. However, this is merely an exemplary description of the technical idea of the present embodiment, and it should be noted that in the technical field to which the present embodiment belongs, The service box device 162 may be modified to perform the steps described in Fig. 6 or to execute one or more of the steps S610 to S640 in parallel, without departing from the essential characteristics of the present embodiment. And FIG. 6 is not limited to the time series order.

As described above, the method for updating the transmission rate according to the present embodiment described in FIG. 6 can be implemented by a program and recorded on a computer-readable recording medium.

A program for implementing the method for updating the transmission rate according to the present embodiment is recorded, and the computer-readable recording medium includes all kinds of recording devices for storing data that can be read by the computer system.

Examples of such computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, etc., and also implemented in the form of a carrier wave (e.g., transmission over the Internet) . The computer readable recording medium may also be distributed over a networked computer system so that computer readable code is stored and executed in a distributed manner.

In addition, functional programs, codes, and code segments for implementing the present embodiment can be easily inferred by programmers in the technical field to which the present embodiment belongs.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. In addition, although all of the components may be implemented as one independent hardware, some or all of the components may be selectively combined to perform a part or all of the functions in one or a plurality of hardware. As shown in FIG. The codes and code segments constituting the computer program may be easily deduced by those skilled in the art. Such a computer program can be stored in a computer-readable storage medium, readable and executed by a computer, thereby realizing an embodiment of the present invention. As the storage medium of the computer program, a magnetic recording medium, an optical recording medium, a carrier wave medium, or the like may be included.

It is also to be understood that the terms such as " comprises, "" comprising," or "having ", as used herein, mean that a component can be implanted unless specifically stated to the contrary. But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

As described above, the present invention improves the TCP performance by using the service box device and the access box device. The present invention improves the problem of the prior art which does not properly support the characteristics of the wireless link in which the situation changes dynamically, The transmission rate to the terminal is calculated on the basis of the round trip time (RTT) to the terminal and the receiver window size (RWND) of the access box apparatus, A data packet transmission method capable of transmitting a data packet to a terminal, and a system therefor, a service box device, and an access box device, which do not affect existing wired / wireless communication devices, It is advantageous to improve performance of TCP only by FAST TCP, Do not need to input the information is a very useful invention for automatically generating an effect that can adapt to the characteristics of the network.

1 is a block diagram schematically showing a data packet transmission system according to the present embodiment,

2 is a block diagram schematically showing a service box apparatus according to the present embodiment,

3 is a block diagram schematically showing an access box apparatus according to the present embodiment,

4 is a flowchart for explaining a data packet transmission method according to the present embodiment,

FIG. 5 is a flowchart illustrating a method of storing a data packet transmission time in a table according to an embodiment of the present invention.

6 is a flowchart for explaining a method of updating the transmission rate according to the present embodiment.

Description of the Related Art

110: Terminal 120: AP

130: access box device 140: switch

150: Internet network 160: Information providing server

162: Service box device

Claims (16)

A first response message transmission unit for transmitting a first response message to a data packet received from the information providing server; A transmission rate calculation unit for calculating a transmission rate to the terminal based on a round trip time (RTT) to a terminal and a receiver window size (RWND) for an access box apparatus; And And a service box data packet transmission unit for transmitting the data packet to the terminal via the access box apparatus according to the calculated transmission rate, The service box device comprising: The method according to claim 1, When receiving a second response message for the data packet from the access box device, updates a round trip time of a data packet corresponding to the second response message, and based on the updated round trip time and the recipient window size, A transmission rate update unit for updating a transmission rate to the access box apparatus; The service box device further comprising: 3. The method of claim 2, Wherein the service box data packet transmission unit comprises: And transmits the data packet to the terminal via the access box device according to the updated transmission rate. The method according to claim 1, Wherein the first response message transmitter comprises: And controls the traffic received from the information providing server by controlling the first response message according to a reception buffer size. 5. The method of claim 4, Wherein the first response message transmitter comprises: Wherein the control unit temporarily suspends transmission of the first response message and controls traffic inflow from the information providing server when the reception buffer size increases beyond a predetermined size. 3. The method of claim 2, Wherein the transmission rate update unit comprises: A value obtained by converting the size of the receiver window secured based on the second response message into a size of a reception buffer of the access box device, a time at which a response message for a data packet transmitted to the terminal arrives, Wherein the updated transmission rate is obtained based on a weight for reflecting a buffer status of a link and a radio access network / control node (RAN / CN), a weight for a buffer (Sensitivity-Factor) The method according to claim 6, The updated transmission rate is calculated by Equation (1) Equation (1)

ego, In Equation (1), RWND size is a value obtained by converting the size of the receiver window into the size of the receiving buffer of the access box device, RTT is a time at which a response message for a data packet transmitted to the terminal arrives, And TE_beta is a weight for reflecting the buffer status of the radio link and the radio access network / control node (RAN / CN). An access box data packet transmission unit for buffering a data packet received from the service box apparatus and transmitting the data packet to the terminal according to the transmission rate calculated by the service box apparatus; And A recipient window number < RTI ID = 0.0 > determiner < / RTI > ≪ / RTI > 9. The method of claim 8, Wherein the access box data packet transmitter comprises: Wherein the data packet is retransmitted through an error recovery algorithm when receiving a retransmission request due to an error of a wireless link from the terminal. 9. The method of claim 8, A second response message transmission unit for transmitting a second response message for the data packet to the service box apparatus, The access box device further comprising: A data packet transmission step of transmitting a data packet from the information providing server; A first response message transmission step of transmitting a first response message for the data packet from the service box device to the information providing server; A transmission rate calculation step of calculating a transmission rate to the terminal based on a round trip time (RTT) from the service box device to a terminal and a receiver window size of an access box device (RWND); And A data packet transmission step of buffering a data packet received from the access box device and transmitting the data packet to the terminal according to the calculated transmission rate And transmitting the data packet. 12. The method of claim 11, A receiver window modification step of modifying a receiver window size of a data packet to be transmitted in a reception buffer size in the access box apparatus; A second response message transmission step of transmitting a second response message for the data packet from the access box device to the service box device; And A round trip time of a data packet corresponding to the second response message is updated in the service box device and a transmission speed of the transmission box to the access box device is updated based on the updated round trip time and the received recipient window size Speed update step The method comprising the steps of: 12. The method of claim 11, A traffic inflow control step of interrupting the transmission of the first response message and controlling the inflow of traffic from the information providing server when the reception buffer of the service box apparatus increases to a predetermined size or more, The method comprising the steps of: 12. The method of claim 11, A data packet retransmission request step of requesting retransmission of the data packet to the access box apparatus upon occurrence of an error of a radio link in the terminal The method comprising the steps of: 12. The method of claim 11, When the access box apparatus receives a retransmission request due to an error of a radio link from the terminal, retransmitting the data packet through an error recovery algorithm The method comprising the steps of: Upon receiving the data packet from the information providing server, the transmission rate to the terminal is calculated on the basis of the round trip time (RTT) to the terminal and the receiver window size of the access box device (RWND) And a round trip time of a data packet corresponding to the second response message is updated upon receiving a second response message for the data packet, and based on the updated round trip time and the recipient window size, A service box device which updates the transmission rate to the information providing server and controls the traffic received from the information providing server by controlling the first response message according to the receiving buffer size; And And transmitting the data packet to the terminal according to the calculated transmission rate, modifying a receiver window size of the data packet by a reception buffer size, and receiving a retransmission request due to an error of a wireless link from the terminal, An access box device for retransmitting the data packet through an algorithm and for transmitting the second response message for the data packet to the service box device, Wherein the data packet transmission system comprises:

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