KR102131427B1 - Method and apparatus for performing a congestion control in stream control transmission protocol - Google Patents

Abstract

The present invention is a method for controlling a congestion window value when data is transmitted between devices having a plurality of associations having different IP (Internet Protocol) addresses, when a new association is set. Estimating available bandwidth information of the new association; Calculating a congestion control threshold of the new association using the estimated available bandwidth information; And setting the calculated congestion control threshold to a congestion window value of the new association, wherein the congestion window value is an initial window value for congestion control indicating the amount of data that can be processed between the devices, and the new The method provides a method characterized in that the congestion control threshold of an association is determined based on the congestion control thresholds of a plurality of preset associations.

Description

METHOD AND APPARATUS FOR PERFORMING A CONGESTION CONTROL IN STREAM CONTROL TRANSMISSION PROTOCOL}

The present invention relates to a method and apparatus for performing congestion control when data is transmitted using a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL). More specifically, it relates to a method of setting an initial value of an appropriate congestion window for dynamically added associations.

Internet transport layer protocol for providing Internet real-time multimedia application service, following TCP (Transmission Control Protocol, hereinafter referred to as'TCP') and UDP (User Datagram Protocol, hereinafter referred to as'UDP'), and recently SCTP (STREAM CONTROL TRANSMISSION PROTOCOL (hereinafter referred to as'SCTP') is attracting attention. SCTP is designed to overcome the problems of existing TCP and UDP, and further provides multi-streaming and multi-homing characteristics, real-time trust transmission of multimedia with multi-stream characteristics and handover of mobile terminals Function.

However, when many users request data transmission to the network, congestion will occur at an intermediate router or a physical layer, and if the amount of data is not continuously reduced despite such congestion, smooth data transmission and reception is difficult due to congestion of retransmission. Therefore, it is necessary to adjust the amount of data injected into the network through the congestion control algorithm existing in the transport layer protocol.

In the present invention, it is intended to provide a method for adjusting the amount of data injected into a network through a congestion control algorithm.

In the present invention, it is intended to provide a method for setting an appropriate congestion window value for an association that is dynamically added.

In the present invention, it is intended to provide a method for setting an appropriate congestion window value by using network status information of an existing association.

In the present invention, it is intended to provide a method for calculating a congestion control threshold of an association that is dynamically added.

In the present invention, to provide a method for calculating the weight information applied to the existing association (association).

In the present invention, it is intended to provide a method of calculating available bandwidth information of an association.

In the present invention, it is intended to provide a method for calculating a data processing speed for association.

The present invention is a method for controlling a congestion window value when data is transmitted between devices having a plurality of associations having different IP (Internet Protocol) addresses, when a new association is set. Estimating available bandwidth information of the new association; Calculating a congestion control threshold of the new association using the estimated available bandwidth information; And setting the calculated congestion control threshold to a congestion window value of the new association, wherein the congestion window value is an initial window value for congestion control indicating the amount of data that can be processed between the devices, and the new The method provides a method characterized in that the congestion control threshold of an association is determined based on the congestion control thresholds of a plurality of preset associations.

In the present invention, the method further includes obtaining congestion control thresholds of the plurality of preset associations, wherein the congestion control threshold of the new association is a congestion control threshold of the obtained plurality of preset associations. Characterized in that it is calculated as the average value of.

In the present invention, the congestion control thresholds of the plurality of preset associations are characterized in that different weight information is applied to each.

In the present invention, the weight information is calculated based on the estimated available bandwidth information of the new association compared to the available bandwidth information of each of the plurality of preset associations.

In the present invention, the available bandwidth information of the predetermined associations or the new association is characterized in that it is estimated based on the data processing speed of the transmitting end and the receiving end for the association.

In the present invention, the data processing speed is characterized in that it is calculated based on the congestion window value and the packet round trip time (Round Trip Time) of the corresponding association.

In the present invention, the data processing speed is characterized in that it is calculated based on the received time interval and packet size of two consecutive packets.

In the present invention, the method includes determining the established new association as a data transmission path; And performing data transmission through the new association based on the set initial window value.

The present invention is a device for setting a congestion window value when data is transmitted between devices having a plurality of associations having different IP (Internet Protocol) addresses, when a new association is set, The available bandwidth information of the new association is estimated, the congestion control threshold of the new association is calculated using the estimated available bandwidth information, and the calculated congestion control threshold is the congestion of the new association. A congestion control unit that sets a window value; And a transmission/reception unit performing data transmission and reception with at least one of the devices based on the set congestion window value, wherein the congestion window value is an initial window value for congestion control indicating an amount of data that can be processed between the devices, It provides an apparatus characterized in that the congestion control threshold of the new association is determined based on the congestion control thresholds of a plurality of predetermined associations.

In the present invention, the congestion control unit obtains congestion control thresholds of the plurality of preset associations, and the congestion control threshold of the new association is calculated as an average value of the obtained congestion control thresholds of the plurality of preset associations. It is characterized by being.

In the present invention, the congestion control unit determines the set new association as a data transmission path, and the transmission/reception unit performs data transmission through the new association based on the set initial window value.

By using the network state information of the existing association, it is possible to set the initial value of the congestion window suitable for the dynamically added association. In addition, when a new association is configured, a larger data processing speed can be secured by setting an initial value of an appropriate congestion window of a new association using a bandwidth estimation technique of the corresponding path and estimated network state information, and It is possible to maximize the utilization of the available bandwidth.

In addition, by varying the weight applied to the congestion control threshold according to the ratio of the entire association, it is possible to compensate for equity in terms of bandwidth share of services of the Concurrent Multipath Transfer (CMT) type service and the Concurrent Multipath Transfer (non-CMT) type service. have.

1 is an embodiment to which the present invention is applied, and shows a network structure diagram to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.
2 is an embodiment to which the present invention is applied, and shows a schematic block diagram of a congestion control device for controlling congestion on a network.
3 is an embodiment to which the present invention is applied, and shows a schematic internal block diagram of a congestion control unit for setting an adaptive congestion window value.
4 is an embodiment to which the present invention is applied, and shows a flowchart for explaining a procedure for transmitting data on a network to which SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.
5 is an embodiment to which the present invention is applied, and a flowchart for explaining a procedure for setting an association on a network to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.
6 is an embodiment to which the present invention is applied, and shows a flow chart for explaining a procedure for performing congestion control on a network to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.
7 is an embodiment to which the present invention is applied, and shows a graph for explaining a congestion control algorithm on a network to which SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.
8 is an embodiment to which the present invention is applied, and shows a flow chart for explaining a method for setting an adaptive congestion window value on a network to which SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.
9 is an embodiment to which the present invention is applied, and shows a flowchart for explaining a method of transmitting data by setting an adaptive congestion window value on a network to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.
10 is an embodiment to which the present invention is applied, and shows a case in which handover is performed by moving a node on a network to which SCTP is applied.

Hereinafter, the configuration and operation of the embodiments of the present invention will be described with reference to the accompanying drawings, and the configuration and operation of the present invention described by the drawings will be described as one embodiment, and thereby the technical spirit of the present invention. And its core composition and function are not limited.

In addition, the terminology used in the present invention has been selected as a general terminology that is currently widely used as much as possible, but in a specific case, the term will be described using an arbitrarily selected term. In such a case, since the meaning is clearly described in the detailed description of the relevant part, it should not be interpreted simply by the name of the term used in the description of the present invention, and the meaning of the term should be understood and interpreted. .

1 is an embodiment to which the present invention is applied, and shows a network structure diagram to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.

Referring to Figure 1, the network to which the present invention is applied can be largely made of a structure connected through the Internet between Host A (10) and Host B (20). The host A 10 and the host B 20 may represent electronic devices capable of transmitting and receiving data, and may include, for example, a computer, a mobile terminal, a router, and a base station. The host A 10 and the host B 20 may each include at least one Internet Protocol (IP) address, for example, the host A 10 may include n IP addresses A1, A2, ¨ ,An may be included, and the host B 20 may include m IP addresses B1, B2, ¨,Bm.

The host A 10 and the host B 20 may establish data paths between the host A 10 and the host B 20 through at least one interface to perform data transmission and reception. TCP (TRANSMISSION CONTROL PROTOCOL), SCTP (STREAM CONTROL TRANSMISSION PROTOCOL), mSCTP (mobile STREAM CONTROL TRANSMISSION PROTOCOL) may be applied as the protocol.

For example, the IP address A1 of the host A 10 and the IP address B1 of the host B 20 may be connected to each other to establish a first path, and the IP address A2 of the host A 10 and the The IP address B2 of the host B 20 may be connected to each other to establish a second path. In addition, the host A 10 and the host B 20 may transmit and receive data using the first path, and when the data transmitted and received on the first path is damaged or lost, the host A 10 ) And the host B 20 may transmit and receive data using the second path. Here, the first path may be referred to as a primary path, and the second path may be referred to as an alternative path.

In this way, a connection established between nodes in order to transmit and receive data is referred to as an association. In the case of SCTP, a single association may have a plurality of streams, and data transmission may be performed using a plurality of streams. In order to perform multi-streaming, the number of streams is determined in an association setting step, and a transmission sequence number (TSN) and a stream identifier (Stream Identifier) may be used.

Meanwhile, in a network to which SCTP is applied, one host may include a plurality of interfaces, different IP addresses may be assigned to each interface, and multiple paths may be set through different IP addresses. Therefore, when associating between hosts, a list of IP addresses held by each host can be exchanged with each other, and data can be transmitted by setting one of the IP addresses as a main route. At this time, the rest of the IP addresses are set as an alternative path, and data may be transmitted through the alternative path when a data retransmission or data transmission error occurs on the main path.

As described above, when data transmission/reception is performed through an association established between hosts, in order to prevent a buffer overflow from occurring in the receiving host, the receiving host may inform the transmitting host of the available buffer size. Therefore, the data transmission rate is adjusted so as not to exceed the available buffer size of the receiving host.

In addition, in order to prevent congestion from occurring in the network, the transmitting host can adjust the data rate by increasing or decreasing the size of the congestion window. For example, in the case of increasing the size of the congestion window, a slow start algorithm and a congestion avoidance algorithm may be used. And, as a case of reducing the size of the congestion window, a fast retransmission algorithm and a timeout retransmission algorithm can be used.

As such, it is referred to as congestion control so that congestion does not occur in the network, and the present invention provides a method for efficiently performing the congestion control.

2 is an embodiment to which the present invention is applied, and shows a schematic block diagram of a congestion control device for controlling congestion on a network.

The congestion control apparatus 200 to which the present invention is applied largely includes an association management unit 210, a route setting unit 220, a flow control unit 230, a congestion control unit 240, a transmission unit 250, and a reception unit 260. Can.

The association management unit 210 serves to set and end the association between nodes. In the case of SCTP, a single association may have a plurality of streams, and data transmission may be performed using a plurality of streams. The setting of the SCTP association will be described in detail in FIG. 5.

The route setting unit 220 exchanges a list of IP addresses held by each node when establishing associations between nodes, and serves to set one of the IP addresses as a main route. The route setting unit 220 may set multiple routes through different IP addresses, and may set an alternative route for other IP addresses other than the main route.

The flow control unit 230 serves to adjust the data transfer rate so that a buffer overflow does not occur at the receiving node. For example, the flow control unit 230 may inform the transmitting node of the available buffer size of the receiving node so as not to exceed the available buffer size of the receiving node.

The congestion control unit 240 serves to increase or decrease the size of the congestion window so that congestion does not occur in the network, and adjust the data transmission rate by increasing or decreasing the size of the congestion window. For example, the congestion control unit 240 may be congested using at least one of a slow start algorithm, a congestion avoidance algorithm, a fast retransmission algorithm, and a timeout retransmission algorithm. Control can be performed.

As an embodiment to which the present invention is applied, the congestion control unit 240 provides a method of setting an appropriate congestion window value for dynamically added associations. At this time, an appropriate congestion window value can be set by using the network status information of the existing association. In addition, an adaptive congestion window value may be calculated by applying weight information to the existing association. Details of the above embodiments will be described with reference to FIGS. 3 to 9.

The transmitting unit 250 and the receiving unit 260 serves to transmit and receive data between nodes.

3 is an embodiment to which the present invention is applied, and shows a schematic internal block diagram of a congestion control unit for setting an adaptive congestion window value.

The congestion control unit 240 to which the present invention is applied may largely include a bandwidth measurement unit 241, a congestion control threshold calculation unit 242, a weight calculation unit 243, and a congestion window initial value setting unit 244. .

The bandwidth measurement unit 241, when a new association is set during data transmission between nodes in which a plurality of associations having different IP (Internet Protocol) addresses are set, available bandwidth information of the new association ) Can be estimated.

In the present invention, when a new association is set, an appropriate congestion window value can be set using the network status information of the existing association. Accordingly, the bandwidth measurement unit 241 may also estimate available bandwidth information of a plurality of preset associations.

The congestion control threshold calculating unit 242 may calculate the congestion control threshold of the new association by using at least one of the estimated available bandwidth information of the predetermined associations and the available bandwidth information of the new association. .

The weight calculator 243 may calculate weight information to be applied to congestion control thresholds of a plurality of preset associations. Here, the weight information may be calculated based on the estimated available bandwidth information of the new association compared to the available bandwidth information of each of the plurality of preset associations.

The congestion window initial value setting unit 244 may set the congestion control threshold of the new association to a congestion window value (cwnd, congestion window) of the new association. Here, the congestion window value is an initial window value for congestion control and indicates the amount of data that can be processed between the devices.

The congestion control threshold of the new association may be determined based on the congestion control thresholds of a plurality of preset associations. For example, the congestion control threshold of the new association may be calculated as an average value of the congestion control thresholds of a plurality of preset associations. In addition, different weight information may be applied to congestion control thresholds of a plurality of preset associations.

4 is an embodiment to which the present invention is applied, and shows a flowchart for explaining a procedure for transmitting data on a network to which SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.

First, in order to transmit data between nodes, an association between nodes must be set (S410). The setting of the SCTP association will be described in detail in FIG. 5.

When the association between nodes is established, each node can exchange its own IP address list with each other, set one of the IP addresses as the main path, and set the remaining IP addresses as an alternative path. In this way, when the main path is established, the node may perform data transmission through the main path (S430).

Meanwhile, it is necessary to control the flow of data in order to prevent a buffer overflow from occurring in the receiving node during data transmission (S450). For example, the flow of data is controlled by informing the transmitting node of the available buffer size of the receiving node.

In addition, congestion control may be performed by increasing or decreasing the size of the congestion window so that congestion does not occur in the network (S470). As an example of increasing the size of the congestion window, a slow start algorithm and a congestion avoidance algorithm may be used, which will be described in detail in FIG. 6.

Data transmission efficiency can be increased by preventing network congestion through the above congestion control algorithm.

When the data transmission is completed through the above process or the association due to the movement of the node is changed, the existing association is terminated (S490).

5 is an embodiment to which the present invention is applied, and a flowchart for explaining a procedure for setting an association on a network to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.

In SCTP, association between nodes is set through 4 steps as shown in FIG. 5.

First, the first SCTP node 10 transmits an initialization message to the second SCTP node 20 (S510). Here, the first SCTP node 10 may indicate a client, and the second SCTP node 20 may refer to a server. Also, the first SCTP node 10 and the second SCTP node 20 may refer to a host device. Further, the message may be transmitted in chunk units. The chunk may mean a unit of information included in the SCTP packet, and one SCTP packet may include a plurality of packets. The initialization message is used for the start of the SCTP association, and the initialization message may include a list of IP addresses to be used by the first SCTP node 10.

When the second SCTP node 20 receives the initialization message, it transmits an initialization response message to the first SCTP node 10 (S520). The initialization response message indicates a response to the initialization message, and the initialization response message may include a list of IP addresses to be used by the second SCTP node 20.

When the first SCTP node 10 receives the initialization response message, it sends a cookie echo message including a cookie state to the second SCTP node 20 (S530), and the second SCTP node 20 When the cookie echo message is received, the cookie echo response message is transmitted to the first SCTP node 10 (S540). Through this process, the association initialization process is completed. The use of these cookies provides a user authentication function for the association.

Meanwhile, in steps S530 and S540, the first SCTP node 10 and the second SCTP node 20 may respectively solve the blind attack problem by generating protocol control block (PCB) state information.

6 is an embodiment to which the present invention is applied, and shows a flow chart for explaining a procedure for performing congestion control on a network to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.

The following control variables are needed to perform congestion control on a network to which SCTP is applied.

The first is receiver advertised window size (rwnd), which indicates the size of a receive node's receive buffer.

The second is congestion window information (cwnd, congestion control window), which indicates a congestion window value for limiting the amount of data transmitted and can be controlled by a transmitting node based on network status information. That is, the congestion window information indicates the amount of data that can be transmitted to prevent congestion in the network.

The third is a congestion control threshold value, which represents a value necessary to distinguish between a slow start state and a congestion avoidance state. For example, a slow start algorithm is performed when the congestion window information is less than or equal to the congestion control threshold, and a congestion avoidance algorithm is performed when the congestion window information is greater than the congestion control threshold.

Referring to FIG. 6, first, an inter-node association may be set for data transmission between nodes (S610).

When the association is set, data transmission starts and a slow start algorithm may be performed (S620). At this time, the congestion control threshold may be determined when the association is established. When the congestion control threshold is defined as a large value, data transmission may be ended in a slow start state if no loss occurs.

Meanwhile, in order to prevent congestion from occurring on the network, a process of comparing the congestion window information and the congestion control threshold is necessary (S630). If the congestion window information is less than or equal to the congestion control threshold, the congestion window information is increased (S640). In the slow start state, the congestion window information may be doubled for each round trip time (RTT).

On the other hand, if the congestion window information is greater than the congestion control threshold, a congestion avoidance algorithm may be performed.

The slow start algorithm and the congestion avoidance algorithm will be described in FIG. 7 below.

7 is an embodiment to which the present invention is applied, and shows a graph for explaining a congestion control algorithm on a network to which SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.

Referring to FIG. 7, it can be seen that the slow start algorithm and the congestion avoidance algorithm are performed according to the change in the congestion window information.

It indicates that the initial value of the congestion window information is 1*MTU (Maximum Transmission Unit), and doubles for each round trip time (RTT). In addition, the congestion control threshold is 8*MTU and represents the boundary between the slow start state and the congestion avoidance state.

First, 1*MTU, which is an initial value of the congestion window information, may be transmitted during a first packet round-trip time at a transmitting node. In response, when a response is transmitted from the receiving node, 2*MTU, which is twice the initial value of the congestion window information, may be transmitted during the second packet round-trip time. When the congestion window information transmitted through the above process reaches the congestion control threshold, it changes from a slow start state to a congestion avoidance state. In the congestion avoidance state, the congestion window information is linearly increased by 1*MTU during the round-trip packet time.

When there is no loss during data transmission, since data transmission is ended in a slow start state, the initial value of the congestion window information affects data transmission time. Therefore, when a new association is added in a situation where a plurality of associations are set, it is necessary to adaptively set the initial value of the congestion window information. Hereinafter, as an embodiment of the present invention, a method for adaptively setting the initial value of the congestion window information is proposed.

8 is an embodiment to which the present invention is applied, and shows a flow chart for explaining a method for setting an adaptive congestion window value on a network to which SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.

When a second association is added during data transmission through a first association established between nodes, more efficient data transmission can be performed by adaptively setting an initial value of congestion window information. Here, the first association may include at least one association.

In the present invention, network status information of a previously established association can be used to adaptively set the initial value of the congestion window information. For example, the network status information may include available bandwidth information, congestion window related parameters, data processing speed, packet arrival time, packet size, and the like.

First, the first available bandwidth information of the first association may be estimated (S810). Here, the first association may be a plurality of associations. Then, the second available bandwidth information of the added second association may be estimated (S830). In this case, the first available bandwidth information and the second available bandwidth information may be estimated based on the data processing speeds of the transmitting node and the receiving node for the corresponding association. In addition, the data processing speed may be calculated based on at least one of a congestion window initial value of the association and a packet round trip time (RTT). Alternatively, the data processing rate may be calculated based on at least one of a reception time interval and a packet size of two consecutive packets.

The estimated congestion control threshold of the second association may be calculated using the estimated first available bandwidth information and second available bandwidth information (S850). At this time, the congestion control threshold of the second association may be calculated based on at least one of the congestion control threshold of the first association and weight information, and the weight information may be calculated based on the first available bandwidth information. Can.

For example, when there are multiple first associations, the congestion control threshold of the second association may be calculated as an average value of the congestion control thresholds of the weighted first association. Different weight information may be applied to the congestion control thresholds of the first association. For example, the weight information may be calculated based on the second available bandwidth information of the second association to the available bandwidth information of each of the plurality of first associations.

This is expressed by the following equation.

Here, S _ref denotes the congestion control threshold of the second association, S _i denotes the congestion control threshold of the previous associative association, i.e., the congestion control threshold of the first association, and R _i denotes S _i Indicates weight information to be applied. B _{n_available} represents available bandwidth information of the n-th association, and B _{i _ available} represents available bandwidth information of the i-th association.

The congestion control threshold calculated as above may be set as the congestion window value of the second association (S870). Here, the congestion window value is an initial window value for congestion control and indicates the amount of data that can be processed between the devices.

As described above, by adaptively setting the initial value of the congestion window of the new association using the network status information of the previous association, a larger data processing speed can be secured, and the utilization of available bandwidth can be maximized.

9 is an embodiment to which the present invention is applied, and shows a flowchart for explaining a method of transmitting data by setting an adaptive congestion window value on a network to which a SCTP (STREAM CONTROL TRANSMISSION PROTOCOL) is applied.

First, in order to transmit data between nodes, an association between nodes must be set, and a new association may be added during data transmission through the established association (S910). When a new association is added, the new association may be determined as a data transmission path (S920).

At this time, before the new association is added, it may be checked whether an existing association exists (S930). Alternatively, it may be confirmed whether a plurality of existing associations exist before the association is added.

If the existing association exists before the association is added, the congestion control threshold of the new association may be calculated using the congestion control threshold of the existing association and the available bandwidth information of the new association (S950).

On the other hand, if the existing association does not exist before the association is added, the congestion control threshold of the new association may be calculated using the available bandwidth information of the new association (S940).

The congestion control threshold of the new association calculated as described above may be set as the congestion window value of the new association (S960).

For example, the congestion window value of the existing association may be set as in Equation 2 below.

Here, C denotes the congestion window value of the existing association, and when it is to, respectively, it represents the congestion window value when it is a fast retransmission or when it is a timeout retransmission. MSS is a maximum segment size (Maximum Segment Size), and determines the size of a data chunk included in the entire packet.

On the other hand, if data transmitted on the network is lost, the transmitting node may detect this by receiving a duplicate selective acknowledgment (SACK) or expiring the retransmission timer. When the transmitting node receives the redundant selective confirmation message, the network is not congested, but recognizes the need for retransmission and performs retransmission. In this case, a fast retransmission algorithm can be applied.

In addition, the timeout retransmission (timeout retransmission) algorithm is applied to the case of retransmitting if the acknowledgment is not received until the transmitted data is timed out.

As an embodiment to which the present invention is applied, when a new association is added, the congestion window value of the new association may be set as in Equation 3 below.

S _ref represents the congestion control threshold of the new association, and can be calculated by Equation 1 described above.

Based on the congestion window value of the new association, data transmission may be performed through the new association (S970).

10 is an embodiment to which the present invention is applied, and shows a case in which handover is performed by moving a node on a network to which SCTP is applied.

While the first session is established through the first access network between the node A (10) and the node B (20), when the node A (10) moves to the second access network, the first session is changed. Can be.

Here, the first access network can be connected between the Node A (10) and the Node B (20) through Router 1 (31) and Router 3 (33), and the third access network is connected to Node A (10). It may be connected between the Node B 20 through Router 2 32 and Router 3 33. In addition, the second access network indicates an area where the first access network and the third access network overlap, where data is received through the IP address of the first access network and the IP address of the third access network. It becomes possible.

In the present invention, as in the second access network, various embodiments described herein may be applied to efficiently control congestion on a network when data is transmitted through a plurality of paths.

The preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the technical spirit and the technical scope of the present invention disclosed in the appended claims. , Replacement or addition may be possible.

Claims (16)

In a method of controlling a congestion window value when data is transmitted between devices having a plurality of associations having different IP (Internet Protocol) addresses,
Estimating available bandwidth information of the new association when a new association is established;
Calculating a congestion control threshold of the new association based on the estimated available bandwidth information and a congestion control threshold of a plurality of preset associations,
The congestion control threshold of the new association is calculated as an average value of the congestion control thresholds of the plurality of preset associations; And
And setting the calculated congestion control threshold to a congestion window value (cwnd) of the new association.
The congestion window value is an initial window value for congestion control, characterized in that it indicates the amount of data that can be processed between the devices.
According to claim 1, The method,
And obtaining congestion control thresholds of the plurality of predetermined associations.

According to claim 1,
The method of claim 1, wherein different weight information is applied to the congestion control thresholds of the plurality of preset associations.
According to claim 3,
And the weight information is calculated based on the estimated available bandwidth information of the new association compared to available bandwidth information of each of the plurality of preset associations. According to claim 4,
The preset bandwidth or the available bandwidth information of the new association is characterized in that it is estimated based on the data processing speed of the transmitting end and the receiving end for the association. The method of claim 5,
The data processing rate is calculated based on the congestion window value and the packet round-trip time (Round Trip Time) of the corresponding association. The method of claim 5,
The method is characterized in that the data processing rate is calculated based on the reception time interval and packet size of two consecutive packets. According to claim 1, The method,
Determining the set new association as a data transmission path; And
And performing data transmission through the new association based on the set initial window value. An apparatus for setting a congestion window value when data is transmitted between devices having a plurality of associations having different IP (Internet Protocol) addresses,
When a new association is established, the available bandwidth information of the new association is estimated, and the new bandwidth is calculated based on the estimated available bandwidth information and a plurality of preset associations. A congestion control unit calculating a congestion control threshold of an association, and setting the calculated congestion control threshold to a congestion window value (cwnd, congestion window) of the new association; And
A transceiver that performs data transmission and reception with at least one of the devices based on the set congestion window value.
Including,
The congestion window value is an initial window value for congestion control and indicates the amount of data that can be processed between the devices.
And the congestion control threshold of the new association is calculated as an average value of the congestion control thresholds of the plurality of preset associations.
10. The method of claim 9, The congestion control unit,
And acquiring congestion control thresholds of the plurality of preset associations.
The method of claim 9,
A device characterized in that different weighting information is applied to the congestion control thresholds of the plurality of preset associations.
The method of claim 11,
And the weight information is calculated based on the estimated available bandwidth information of the new association with respect to available bandwidth information of each of the plurality of preset associations. The method of claim 12,
An apparatus characterized in that the preset associations or the available bandwidth information of the new association is estimated based on the data processing speeds of the transmitting end and the receiving end for the association.
The method of claim 13,
The data processing rate is calculated based on the congestion window value and the packet round-trip time (Round Trip Time) of the corresponding association. The method of claim 13,
The device is characterized in that the data processing rate is calculated based on the reception time interval and packet size of two consecutive packets. The method of claim 9,
The congestion control unit determines the set new association as a data transmission path,
The transmission/reception unit performs data transmission through the new association based on the set initial window value.

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