CN102946360B - Network flow control system and method for controlling network flow - Google Patents
Network flow control system and method for controlling network flow Download PDFInfo
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Abstract
The present invention proposes a kind of network flow control system, comprising: detecting unit, point-to-point flow is detected and added up; Judging unit, detect flow exceed threshold value time, judge whether to take packet discard process; Determining unit, receiving the judged result of judging unit, when judged result is for being, determining the protocol type of the packet be dropped; First processing unit, when the protocol type judging described packet is transmission control protocol, takes described packet discard process, controls receiving terminal simultaneously and sends the message representing buffer congestion to transmitting terminal.Correspondingly, present invention also offers a kind of method for controlling network flow.By technical scheme of the present invention, when flowing exceed threshold value, while packet loss process is carried out to it, the message of buffer congestion is sent to transmitting terminal, thus receiving terminal blocks up to make transmitting terminal think, initiatively reduce message transmitting spped rate, make, while minimizing outlet bandwidth, to reduce ingress bandwidth.
Description
Technical field
The present invention relates to networking technology area, in particular to a kind of network flow control system and a kind of method for controlling network flow.
Background technology
Along with the development of Internet technology, P2P(PointtoPoint, point-to-point) technical development is rapid, applies more and more abundanter.P2P, while prosperity the Internet, also consumes a large amount of Internet bandwidths.The accounting of current P2P flow at present on network is more than 50%, and subnetwork spreads unchecked because P2P downloads, and directly affects the commodity network application such as HTTP web page browsing, E-mail receiver/send, causes user's being discontented with operator.Operator deals with escalating of internet traffic by extended network capacity, but the network set up of the cost investment network congestion that still can cause because of P2P and network availability is reduced, have impact on the service quality of telecommunications.
Due to increasing rapidly of the Internet P2P flow, a large amount of carrier network bandwidth is occupied, and causes network congestion, normal internet, applications business is received and has a strong impact on.For ensureing network transmission quality, operator starts the method for attempting control P2P bandwidth: on the link of operator, place deep packet inspection device, identifying P2P agreement, control threshold value is set, adopting the bandwidth of mode to P2P of packet loss to control when flowing exceed threshold value.
The defect of prior art is:
(1) TCP(TransmissionControlProtocol, transmission control protocol) protocol stack or P2P client can detect Network Packet Loss, start message retransmission, thus cause follow-up message burst;
(2) the method only reduces the P2P bandwidth of chain way outlet, but the bandwidth of entrance P2P is controlled.
Therefore, need a kind of new technical scheme, ingress bandwidth can be reduced while minimizing outlet bandwidth, thus the pressure that alleviation flow causes network.
Summary of the invention
The present invention, just based on the problems referred to above, proposes a kind of new technical scheme, can reduce ingress bandwidth while minimizing outlet bandwidth, thus the pressure that alleviation flow causes network.
In view of this, the present invention proposes a kind of network flow control system, comprising: detecting unit, point-to-point flow is detected and added up; Judging unit, when flowing exceed threshold value described in detecting, judges whether to take packet discard process; Determining unit, receives the judged result of described judging unit, when described judged result is for being, determines the protocol type of the packet be dropped; First processing unit, when the protocol type judging described packet is transmission control protocol, takes described packet discard process, controls receiving terminal simultaneously and sends the message representing buffer congestion to transmitting terminal.
In this technical scheme, when point-to-point flow exceed threshold value time, judges the type of data on flows bag, if type of data packet is transmission control protocol, then carry out packet loss, thus reduce the bandwidth of receiving terminal, but the bandwidth of transmitting terminal is not controlled.Again because transmission control protocol stack or P2P client can detect the packet abandoned, and message retransmission may be carried out to the Network Packet Loss of transmission control protocol type, therefore this programme is while carrying out packet loss, the message of buffer congestion is sent to transmitting terminal, thus receiving terminal blocks up to make transmitting terminal think, initiatively reduces message transmitting spped rate, make while minimizing outlet bandwidth, reduce ingress bandwidth, also have certain inhibition to the burst rate that transmission control protocol retransmits.
In technique scheme, preferably, also comprising: the second processing unit, when judging that the described protocol type by the packet be dropped is User Datagram Protocol, taking described packet discard process.
In this technical scheme, because the transmitting terminal of User Datagram Protocol type is not by the control of receiving terminal, therefore, literary composition of need not transmitting messages is to transmitting terminal.So when flowing exceed threshold value, can be directly that the agreement of user data package carries out packet loss process by protocol type, and other measures need not be taked.
In technique scheme, preferably, also comprise: retransmission unit, receive the judged result of described judging unit, when described judged result is no, forward described packet.
In this technical scheme, if when judging unit judges also not need to take packet loss process, then packet is forwarded by router etc.
In technique scheme, preferably, the detection algorithm of described detecting unit comprises CAR algorithm.
In this technical scheme, CAR algorithm can be adopted to detect point-to-point flow.
In technique scheme, preferably, the message of described expression buffer congestion comprises the notice message that tcp window is 0.
In this technical scheme, can reflect that receiving terminal can supply the size of the buffering area of transmitting terminal by the size of tcp window, like this in the process of buffer size change, a sliding window will be formed.The work rhythm of communicating pair can be regulated by the window size adjusting TCP, when tcp window is 0, then represent that receiving terminal can not again for transmitting terminal provides buffering area, thus make the transmission rate of transmitting terminal reduce, and reaches the object reducing ingress bandwidth.
According to another aspect of the invention, additionally provide a kind of method for controlling network flow, comprising: step 202, point-to-point flow is detected and added up; Step 204, when flowing exceed threshold value described in detecting, judges whether to take packet discard process; Step 208, receives the judged result of described judging unit, when described judged result is for being, determines the protocol type of the packet be dropped; Step 210, when the protocol type judging described packet is transmission control protocol, takes described packet discard process, controls receiving terminal simultaneously and sends the message representing buffer congestion to transmitting terminal.
In this technical scheme, when point-to-point flow exceed threshold value time, judges the type of data on flows bag, if type of data packet is transmission control protocol, then carry out packet loss, thus reduce the bandwidth of receiving terminal, but the bandwidth of transmitting terminal is not controlled.Again because transmission control protocol stack or P2P client can detect the packet abandoned, and message retransmission may be carried out to the Network Packet Loss of transmission control protocol type, therefore this programme is while carrying out packet loss, the message of buffer congestion is sent to transmitting terminal, thus receiving terminal blocks up to make transmitting terminal think, initiatively reduces message transmitting spped rate, make while minimizing outlet bandwidth, reduce ingress bandwidth, also have certain inhibition to the burst rate that transmission control protocol retransmits.
In technique scheme, preferably, described step 210 also comprises: when judging that the described protocol type by the packet be dropped is User Datagram Protocol, take described packet discard process.
In this technical scheme, because the transmitting terminal of User Datagram Protocol type is not by the control of receiving terminal, therefore, literary composition of need not transmitting messages is to transmitting terminal.So when flowing exceed threshold value, can be directly that the agreement of user data package carries out packet loss process by protocol type, and other measures need not be taked.
In technique scheme, preferably, described step 208 also comprises: retransmission unit, receives the judged result of described judging unit, when described judged result is no, forwards described packet.
In this technical scheme, if when judging unit judges also not need to take packet loss process, then packet is forwarded by router etc.
In technique scheme, preferably, the detection algorithm of described detecting unit comprises CAR algorithm.
In this technical scheme, CAR algorithm can be adopted to detect point-to-point flow.
In technique scheme, preferably, the message of described expression buffer congestion comprises the notice message that tcp window is 0.
In this technical scheme, can reflect that receiving terminal can supply the size of the buffering area of transmitting terminal by the size of tcp window, like this in the process of buffer size change, a sliding window will be formed.The work rhythm of communicating pair can be regulated by the window size adjusting TCP, when tcp window is 0, then represent that receiving terminal can not again for transmitting terminal provides buffering area, thus make the transmission rate of transmitting terminal reduce, and reaches the object reducing ingress bandwidth.
By above technical scheme, point-to-point flow exceed threshold value time, packet loss process can be taked, control receiving terminal simultaneously and send to transmitting terminal and represent the message of buffer congestion, the transmission rate of transmitting terminal is reduced.The ingress bandwidth of network is reduced like this while reducing outlet bandwidth, thus the pressure that alleviation flow causes network.
Accompanying drawing explanation
Fig. 1 shows the block diagram of network flow control system according to an embodiment of the invention;
Fig. 2 shows the flow chart of method for controlling network flow according to an embodiment of the invention;
Fig. 3 shows the particular flow sheet of method for controlling network flow according to an embodiment of the invention;
Fig. 4 shows the overall flow figure of method for controlling network flow according to an embodiment of the invention;
Fig. 5 shows the schematic diagram of the receivable data sequence number in buffering area according to an embodiment of the invention.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
Fig. 1 shows the block diagram of network flow control system according to an embodiment of the invention.
As shown in Figure 1, the network flow control system 100 of embodiments of the invention comprises: detecting unit 102, detects point-to-point flow and adds up; Judging unit 104, when flowing exceed threshold value described in detecting, judges whether to take packet discard process; Determining unit 106, receives the judged result of described judging unit 104, when described judged result is for being, determines the protocol type of the packet be dropped; First processing unit 108, when the protocol type judging described packet is transmission control protocol, takes described packet discard process, controls receiving terminal simultaneously and sends the message representing buffer congestion to transmitting terminal.
In this technical scheme, when point-to-point flow exceed threshold value time, judges the type of data on flows bag, if type of data packet is transmission control protocol, then carry out packet loss, thus reduce the bandwidth of receiving terminal, but the bandwidth of transmitting terminal is not controlled.Again because transmission control protocol stack or P2P client can detect the packet abandoned, and message retransmission may be carried out to the Network Packet Loss of transmission control protocol type, therefore this programme is while carrying out packet loss, the message of buffer congestion is sent to transmitting terminal, thus receiving terminal blocks up to make transmitting terminal think, initiatively reduces message transmitting spped rate, make while minimizing outlet bandwidth, reduce ingress bandwidth, also have certain inhibition to the burst rate that transmission control protocol retransmits.
In technique scheme, preferably, also comprising: the second processing unit 110, when judging that the described protocol type by the packet be dropped is User Datagram Protocol, taking described packet discard process.
In this technical scheme, because the transmitting terminal of User Datagram Protocol type is not by the control of receiving terminal, therefore, literary composition of need not transmitting messages is to transmitting terminal.So when flowing exceed threshold value, can be directly that the agreement of user data package carries out packet loss process by protocol type, and other measures need not be taked.
In technique scheme, preferably, also comprise: retransmission unit 112, receive the judged result of described judging unit, when described judged result is no, forward described packet.
In this technical scheme, if when judging unit judges also not need to take packet loss process, then packet is forwarded by router etc.
In technique scheme, preferably, the detection algorithm of described detecting unit comprises CAR algorithm.
In this technical scheme, CAR algorithm can be adopted to detect point-to-point flow.
In technique scheme, preferably, the message of described expression buffer congestion comprises the notice message that tcp window is 0.
In this technical scheme, can reflect that receiving terminal can supply the size of the buffering area of transmitting terminal by the size of tcp window, like this in the process of buffer size change, a sliding window will be formed.The work rhythm of communicating pair can be regulated by the window size adjusting TCP, when tcp window is 0, then represent that receiving terminal can not again for transmitting terminal provides buffering area, thus make the transmission rate of transmitting terminal reduce, and reaches the object reducing ingress bandwidth.
Fig. 2 shows the flow chart of method for controlling network flow according to an embodiment of the invention.
As shown in Figure 2, the method for controlling network flow of embodiments of the invention, comprising: step 202, detects point-to-point flow and adds up; Step 204, when flowing exceed threshold value described in detecting, judges whether to take packet discard process; Step 208, receives the judged result of described judging unit, when described judged result is for being, determines the protocol type of the packet be dropped; Step 210, when the protocol type judging described packet is transmission control protocol, takes described packet discard process, controls receiving terminal simultaneously and sends the message representing buffer congestion to transmitting terminal.
In this technical scheme, when point-to-point flow exceed threshold value time, judges the type of data on flows bag, if type of data packet is transmission control protocol, then carry out packet loss, thus reduce the bandwidth of receiving terminal, but the bandwidth of transmitting terminal is not controlled.Again because transmission control protocol stack or P2P client can detect the packet abandoned, and message retransmission may be carried out to the Network Packet Loss of transmission control protocol type, therefore this programme is while carrying out packet loss, the message of buffer congestion is sent to transmitting terminal, thus receiving terminal blocks up to make transmitting terminal think, initiatively reduces message transmitting spped rate, make while minimizing outlet bandwidth, reduce ingress bandwidth, also have certain inhibition to the burst rate that transmission control protocol retransmits.
In technique scheme, preferably, described step 210 also comprises: when judging that the described protocol type by the packet be dropped is User Datagram Protocol, take described packet discard process.
In this technical scheme, because the transmitting terminal of User Datagram Protocol type is not by the control of receiving terminal, therefore, literary composition of need not transmitting messages is to transmitting terminal.So when flowing exceed threshold value, can be directly that the agreement of user data package carries out packet loss process by protocol type, and other measures need not be taked.
In technique scheme, preferably, described step 208 also comprises: retransmission unit, receives the judged result of described judging unit, when described judged result is no, forwards described packet.
In this technical scheme, if when judging unit judges also not need to take packet loss process, then packet is forwarded by router etc.
In technique scheme, preferably, the detection algorithm of described detecting unit comprises CAR algorithm.
In this technical scheme, CAR algorithm can be adopted to detect point-to-point flow.
In technique scheme, preferably, the message of described expression buffer congestion comprises the notice message that tcp window is 0.
In this technical scheme, can reflect that receiving terminal can supply the size of the buffering area of transmitting terminal by the size of tcp window, like this in the process of buffer size change, a sliding window will be formed.The work rhythm of communicating pair can be regulated by the window size adjusting TCP, when tcp window is 0, then represent that receiving terminal can not again for transmitting terminal provides buffering area, thus make the transmission rate of transmitting terminal reduce, and reaches the object reducing ingress bandwidth.
Fig. 3 shows the particular flow sheet of method for controlling network flow according to an embodiment of the invention.
As shown in Figure 3, the idiographic flow of the method for controlling network flow of embodiments of the invention is as follows:
Step 302, processing data packets enters flow control CAR algorithmic decision.
Step 304, judges whether to take packet loss process.If judged result is yes, enter step 308, if judged result is no, enter step 306.
Step 306, needs to take packet loss process, judges whether the protocol type of the packet of packet loss process is Transmission Control Protocol.If judged result is yes, enter step 308, if judged result is no, enter step 310.
Step 308 is 0 message to transmitting terminal send window.Can reflect that receiving terminal can supply the size of the buffering area of transmitting terminal by the size of tcp window, like this in the process of buffer size change, a sliding window will be formed.The work rhythm of communicating pair can be regulated by the window size adjusting TCP, when tcp window is 0, then represent that receiving terminal can not again for transmitting terminal provides buffering area, thus make the transmission rate of transmitting terminal reduce, and reaches the object reducing ingress bandwidth.
Step 310, carries out packet loss process.
Fig. 4 shows the overall flow figure of method for controlling network flow according to an embodiment of the invention.
As shown in Figure 4, the overall flow of the method for controlling network flow of embodiments of the invention is as follows:
Step 402, at carrier network Access Layer or key deployment DPI(DeepPacketInspection, deep-packet detection) equipment.
Step 404, carries out detection and control by traditional C AR algorithm to the flow of P2P.
Step 406, to CAR algorithm judge to need the TCP flow send window of packet loss as 0 confirmation message.Wherein, TCP uses sliding window to carry out flow control, when receiving terminal inbound pacing is very slow the speed of transmitting terminal transmission data is very fast, is regulated the work rhythm of communicating pair by the window size adjusting TCP.So-called sliding window, can the understanding one-tenth receiving terminal buffer size that can supply, and TCP utilizes a window slided to tell that transmitting terminal can supply great buffering area to the data that it sends.Because window defined by 16 bit, the thus buffering of the receiving terminal TCP maximum supply of energy 65535 bytes.
As shown in Figure 5, the sequence number of window size and first data can be utilized to calculate maximum receivable data sequence number.Fig. 5 represents, receiving terminal TCP can the buffering of maximum supply 65519 bytes.
Step 408, continues to monitor P2P flow.
More than be described with reference to the accompanying drawings technical scheme of the present invention, by technical scheme of the present invention, carry out on the basis of flow control algorithm at use packet discarding method, buffer congestion message is sent to end of giving out a contract for a project by simulation packet receiving end, P2P message source is made to think that receiving terminal is congested, initiatively reduce message transmitting spped rate, thus decrease ingress bandwidth while decreasing outlet bandwidth, also have certain inhibition to the burst rate that TCP retransmits simultaneously.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a network flow control system, is characterized in that, comprising:
Detecting unit, detects point-to-point flow and adds up;
Judging unit, when flowing exceed threshold value described in detecting, judges whether to take packet discard process;
Determining unit, receives the judged result of described judging unit, when described judged result is for being, determines the protocol type of the packet be dropped;
First processing unit, when the protocol type judging described packet is transmission control protocol, takes described packet discard process, controls receiving terminal simultaneously and sends the message representing buffer congestion to transmitting terminal.
2. network flow control system according to claim 1, is characterized in that, also comprises:
Second processing unit, when judging that the described protocol type by the packet be dropped is User Datagram Protocol, takes described packet discard process.
3. network flow control system according to claim 2, is characterized in that, also comprises:
Retransmission unit, receives the judged result of described judging unit, when described judged result is no, forwards described packet.
4. network flow control system according to claim 3, is characterized in that, the detection algorithm of described detecting unit comprises CAR algorithm.
5. network flow control system according to any one of claim 1 to 4, is characterized in that, the message of described expression buffer congestion comprises the notice message that tcp window is 0.
6. a method for controlling network flow, is characterized in that, comprising:
Step 202, detects point-to-point flow and adds up;
Step 204, when flowing exceed threshold value described in detecting, judges whether to take packet discard process;
Step 208, receiving the judged result of judging unit, when described judged result is for being, determining the protocol type of the packet be dropped;
Step 210, when the protocol type judging described packet is transmission control protocol, takes described packet discard process, controls receiving terminal simultaneously and sends the message representing buffer congestion to transmitting terminal.
7. method for controlling network flow according to claim 6, is characterized in that, described step 210 also comprises:
When judging that the described protocol type by the packet be dropped is User Datagram Protocol, take described packet discard process.
8. method for controlling network flow according to claim 7, is characterized in that, described step 208 also comprises:
Retransmission unit, receives the judged result of described judging unit, when described judged result is no, forwards described packet.
9. method for controlling network flow according to claim 8, is characterized in that, the detection algorithm of described detecting unit comprises CAR algorithm.
10. the method for controlling network flow according to any one of claim 6 to 9, is characterized in that, the message of described expression buffer congestion comprises the notice message that tcp window is 0.
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US9864716B2 (en) * | 2015-05-20 | 2018-01-09 | International Business Machines Corporation | Receiving buffer credits by a plurality of channels of one or more host computational devices for transmitting data to a control unit |
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CN109995668B (en) * | 2018-01-02 | 2022-10-21 | 中国移动通信有限公司研究院 | Flow control method and device, storage medium |
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CN116830543A (en) * | 2022-01-11 | 2023-09-29 | 华为技术有限公司 | Packet loss processing method, device, switch, sending equipment and data transmission system |
CN115085890B (en) * | 2022-06-23 | 2024-06-25 | 云合智网(上海)技术有限公司 | Method for optimizing TCP RTO retransmission waiting time by data center network chip |
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