CN103152285B - Local terminal network element, opposite end network element and send window method of adjustment - Google Patents
Local terminal network element, opposite end network element and send window method of adjustment Download PDFInfo
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- CN103152285B CN103152285B CN201310081686.7A CN201310081686A CN103152285B CN 103152285 B CN103152285 B CN 103152285B CN 201310081686 A CN201310081686 A CN 201310081686A CN 103152285 B CN103152285 B CN 103152285B
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Abstract
The invention discloses a kind of local terminal network element, opposite end network element and send window method of adjustment, this send window method of adjustment comprises: local terminal network element is engraved in send window and sends the first packet to opposite end network element first time; Local terminal network element receives the second packet that opposite end network element sends, and obtains from the second packet the first forward time delay value recorded the second packet, and is engraved in the 3rd time in send window and sends the 3rd packet to opposite end network element; Local terminal network element receives the 4th packet that opposite end network element sends, and obtains the second forward time delay value recorded the 4th packet, and adjust send window according to the difference of the second forward time delay value and the first forward time delay value from the 4th packet.By above disclosure, the present invention can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
Description
Technical field
The present invention relates to network communication technology field, particularly relate to a kind of local terminal network element, opposite end network element and send window method of adjustment.
Background technology
TCP(TransmissionControlProtocol, transmission control protocol) be current Internet(internet) in the transmission control protocol that extensively adopts, for providing reliable transmission service according to the order of sequence between each main frame.Its core missions are on the basis managed at shared resource, realize logarithm by the business transmission rate of certain policy control source and be reportedly input into row congestion control, modal congestion control mechanism has two classes: the congestion control based on packet loss and the congestion control based on time delay.Congestion control based on packet loss is using packet loss as congested characteristic events, and for prediction its poor in timeliness congested, the generation that the congestion control mechanism based on time delay can be congested according to the prospective prediction of the change of network queuing delay, makes adjustment have more specific aim.
Network queuing delay reflects the queuing time of data in the transmission equipments such as router, and during network idle, queuing delay levels off to predetermined threshold, and along with network traffics increase, congested aggravation network queuing delay is similar to thread to be increased.Therefore network queuing delay effectively can reflect the congestion condition that network is current.
Congestion control based on time delay predicts network congestion situation according to the change of network queuing delay, and the accuracy of its web impact factor largely depends on the accuracy that network queuing delay is measured.Network is queued in transmission equipment and produces, be difficult to measure in real time at transmitting terminal and receiving terminal, the current overwhelming majority is by the RTT(Round-TripTime in data transfer based on the congestion avoidance algorithm of time delay, round-trip delay) the network queuing delay weighed, because it can monolaterally be disposed, method of measurement is simple and by many jamming control methods based on time delay time-delay measuring method by default.
Refer to Fig. 1, Fig. 1 data interaction figure that to be prior art estimate based on the queuing delay of RTT, as shown in Figure 1, local terminal network element is in moment t
1' sending packet to opposite end network element, opposite end network element is at experience forward time delay value D
3after receive this packet, and at experience ACK D time of delay
1after send the acknowledgment packet to local terminal network element, local terminal network element experience reverse time delay value D
2after at moment t
2' receive this confirmation bag, thus obtain time delay T, and send window is adjusted using this time delay T as the time of delay in transmission loop.
Therefore, the RTT measuring principle based on prior art sends packet by measurement local terminal network element to receive opposite end network element to the time of delay of the time difference between the confirmation bag of this packet as transmission loop to opposite end network element to local terminal network element.The timing when local terminal network element sends bag, when local terminal network element receives the confirmation bag to this bag, timing terminates, and method is simple, in the industry cycle a kind of method measuring time delay by default.
In the method, confirmed the Congestion Level SPCC of current network by the change of the RTT calculating every a collection of bag, according to the Congestion Level SPCC obtained in conjunction with the suitable increase of respective congestion control algorithm or reduce send window, reach the object of congestion control.
But, accurate, only have forward time delay value D
3could reflect network congestion situation, and time delay T contains irrelevant ACK D time of delay of calcaneus rete network congestion condition
1with reverse time delay value D
2, this ACK D time of delay
1with the variable quantity that reverse time delay value D2 is irrelevant with the congestion condition of network normal transmission, time delay T accurately can not weigh network congestion situation during forward transmission after introducing these two parameters.
Therefore, in the prior art shown in Fig. 1, according to time delay T, adjustment is carried out to send window and can produce inaccurate adjustment result.
Summary of the invention
Embodiment of the present invention provides a kind of local terminal network element, opposite end network element and send window method of adjustment, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
On the one hand, a kind of send window method of adjustment is provided, comprises: local terminal network element is engraved in send window and sends the first packet to opposite end network element first time, wherein in the first packet, record the very first time stamp in expression first moment; The first packet that opposite end network element sends at the second reception local terminal network element, deducts very first time stamp to obtain the first forward time delay value, the first forward time delay value is recorded in the second packet and is sent to local terminal network element by second timestamp in expression second moment; Local terminal network element receives the second packet that opposite end network element sends, the first forward time delay value is obtained from the second packet, and be engraved in the 3rd time in send window send the 3rd packet to opposite end network element, wherein record the 3rd timestamp in expression the 3rd moment in the 3rd packet; The 3rd packet that opposite end network element sends at the 4th reception local terminal network element, deducts the 3rd timestamp to obtain the second forward time delay value, the second forward time delay value is recorded in the 4th packet and is sent to local terminal network element by the 4th timestamp in expression the 4th moment; Local terminal network element receives the 4th packet that opposite end network element sends, and obtain the second forward time delay value from the 4th packet, the difference according to the second forward time delay value and the first forward time delay value adjusts send window.
In the first possible execution mode of first aspect, the difference according to the second forward time delay value and the first forward time delay value adjusts send window, comprising: when difference equals predetermined threshold, keeps send window constant; When difference is greater than predetermined threshold, reduce send window according to pre-defined algorithm; When difference is less than predetermined threshold, increase send window according to pre-defined algorithm.
In the execution mode that the second of first aspect is possible, the second packet is specially the confirmation bag of the first packet, and the 4th packet is specially the confirmation bag of the 3rd packet.
Second aspect provides a kind of send window method of adjustment, comprising: local terminal network element is engraved in send window and sends the first packet to opposite end network element first time, wherein records the very first time stamp in expression first moment in the first packet; Local terminal network element receives the second packet that opposite end network element sends, the the first forward time delay value recorded the second packet is obtained from the second packet, and be engraved in the 3rd time in send window send the 3rd packet to opposite end network element, wherein record the 3rd timestamp in expression the 3rd moment in the 3rd packet, wherein, first forward time delay value is that second timestamp in expression second moment is deducted very first time stamp gained by opposite end network element, and the second moment was the moment that opposite end network element receives the first packet that local terminal network element sends; Local terminal network element receives the 4th packet that opposite end network element sends, the the second forward time delay value recorded the 4th packet is obtained from the 4th packet, and according to the difference of the second forward time delay value and the first forward time delay value, send window is adjusted, wherein, second forward time delay value is that the 4th timestamp in expression the 4th moment is deducted the 3rd timestamp gained by opposite end network element, and the 4th moment was the moment that opposite end network element receives the 3rd packet that local terminal network element sends.
In the first possible execution mode of second aspect, the difference according to the second forward time delay value and the first forward time delay value adjusts send window, comprising: when difference equals predetermined threshold, keeps send window constant; When difference is greater than predetermined threshold, reduce send window according to pre-defined algorithm; When difference is less than predetermined threshold, increase send window according to pre-defined algorithm.
The third aspect provides a kind of send window method of adjustment, comprise: the first packet that opposite end network element sends at the second reception local terminal network element, second timestamp in expression second moment is deducted record in the first packet the very first time stamp to obtain the first forward time delay value, first forward time delay value is recorded in the second packet and is sent to local terminal network element, wherein, the very first time, stamp was for representing for the first moment, and the first moment was that local terminal network element when sending the first packet to opposite end network element in send window; The 3rd packet that opposite end network element sends at the 4th reception local terminal network element, 4th timestamp in expression the 4th moment is deducted the 3rd timestamp that records in the 3rd packet to obtain the second forward time delay value, the second forward time delay value is recorded in the 4th packet and is sent to local terminal network element; Wherein, the 3rd timestamp is for representing for the 3rd moment, and the 3rd moment was that local terminal network element when sending the 3rd packet to opposite end network element in send window;
In the first possible execution mode of the third aspect, the second packet is specially the confirmation bag of the first packet, and the 4th packet is specially the confirmation bag of the 3rd packet.
Fourth aspect provides a kind of local terminal network element, comprising: Packet Generation module, sends the first packet to opposite end network element for being engraved in send window first time, wherein records the very first time stamp in expression first moment in the first packet; Packet-receiving module, for receiving the second packet that opposite end network element sends, the the first forward time delay value recorded the second packet is obtained from the second packet, and be engraved in the 3rd time in send window send the 3rd packet to opposite end network element, wherein record the 3rd timestamp in expression the 3rd moment in the 3rd packet, and, first forward time delay value is that second timestamp in expression second moment is deducted very first time stamp gained by opposite end network element, and the second moment was the moment that opposite end network element receives the first packet that local terminal network element sends; Packet-receiving module is further used for the 4th packet receiving opposite end network element transmission, obtains from the 4th packet the second forward time delay value recorded the 4th packet; Send window adjusting module, for adjusting send window according to the difference of the second forward time delay value and the first forward time delay value, wherein, second forward time delay value is that the 4th timestamp in expression the 4th moment is deducted the 3rd timestamp gained by opposite end network element, and the 4th moment was the moment that opposite end network element receives the 3rd packet that local terminal network element sends.
In the first possible execution mode of fourth aspect, send window adjusting module is used for: when difference equals predetermined threshold, keeps send window constant; When difference is greater than predetermined threshold, reduce send window according to pre-defined algorithm; When difference is less than predetermined threshold, increase send window according to pre-defined algorithm.
5th aspect provides a kind of opposite end network element, comprising: packet-receiving module, for the first packet sent at the second reception local terminal network element; Timestamp processing module, stabs for second timestamp in expression second moment being deducted the very first time of recording in the first packet to obtain the first forward time delay value; Packet Generation module, for the first forward time delay value being recorded in the second packet and being sent to local terminal network element, wherein, the very first time, stamp was for representing for the first moment, and the first moment was that local terminal network element when sending the first packet to opposite end network element in send window; Packet-receiving module is further used for the 3rd packet sent at the 4th reception local terminal network element, timestamp processing module is further used for the 4th timestamp in expression the 4th moment to deduct the 3rd timestamp that records in the 3rd packet to obtain the second forward time delay value, and Packet Generation module is further used for the second forward time delay value being recorded in the 4th packet and being sent to local terminal network element; Wherein, the 3rd timestamp is for representing for the 3rd moment, and the 3rd moment was that local terminal network element when sending the 3rd packet to opposite end network element in send window.
The local terminal network element that embodiment of the present invention provides, opposite end network element and send window method of adjustment, by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and according to the difference of the second forward time delay value and the first forward time delay value, send window is adjusted, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
Accompanying drawing explanation
Fig. 1 data interaction figure that to be prior art estimate based on the queuing delay of RTT;
Fig. 2 be send window method of adjustment first execution mode of the present invention based on configuration diagram;
Fig. 3 is the schematic flow sheet of send window method of adjustment first execution mode of the present invention;
Fig. 4 is the data interaction figure in send window method of adjustment first execution mode of the present invention;
Fig. 5 is the schematic flow sheet of invention send window method of adjustment second execution mode;
Fig. 6 is the schematic flow sheet of invention send window method of adjustment the 3rd execution mode;
Fig. 7 is the structural representation of local terminal network element first execution mode of the present invention;
Fig. 8 is the structural representation of opposite end of the present invention network element first execution mode;
Fig. 9 is the structural representation of local terminal network element second execution mode of the present invention;
Figure 10 is the structural representation of opposite end of the present invention network element second execution mode.
Embodiment
Below in conjunction with drawings and embodiments, the present invention is described in detail.
Refer to Fig. 2 to Fig. 4, Fig. 2 be send window method of adjustment first execution mode of the present invention based on configuration diagram, Fig. 3 is the schematic flow sheet of send window method of adjustment first execution mode of the present invention, and Fig. 4 is the data interaction figure in send window method of adjustment first execution mode of the present invention.First refer to Fig. 2, send window method of adjustment of the present invention realizes based on local terminal network element 10 and opposite end network element 20, carries out network connection between local terminal network element 10 and opposite end network element 20 by wired or wireless mode.
It should be noted that, in the data interaction figure shown in Fig. 4, it is T that forward time delay value comprises the first forward time delay value
1and second forward time delay value be T
2, it is T that reverse time delay value comprises the first reverse time delay value
3and second back time delay value be T
4, wherein, forward time delay value represents that local terminal network element 10 sends the transmission time needed for packet to opposite end network element 20, and reverse time delay value represents that opposite end network element 20 sends packet to the transmission time required during local terminal network element 10.
Because forward time delay value represents that packet is sent to the time needed for the other side from we, therefore, local terminal network element 10 is when sending packet to opposite end network element 20, forward time delay value is longer, represent that the network condition between local terminal network element 10 to opposite end network element 20 is not good, forward time delay value is shorter, represent that the network condition between local terminal network element 10 to opposite end network element 20 is better, therefore for local terminal network element 10, forward time delay value can reflect the network congestion situation between local terminal network element 10 to opposite end network element 20, local terminal network element 10 adjusts send window according to obtained network congestion situation, thus can according to the quantity forwarded of network congestion situation control data bag effectively, to make full use of the limited network bandwidth.
And oppositely time delay value represents that packet is sent to the time needed for we from the other side, for local terminal network element 10, reverse time delay value can only reflect the network congestion situation between opposite end network element 20 to local terminal network element 10, therefore between this reverse time delay value and send window of local terminal network element 10 without any contacting, therefore can not using the adjustment foundation of reverse time delay value as the send window of local terminal network element 10.
As shown in Figure 3, send window method of adjustment of the present invention comprises:
Step 301, local terminal network element 10 is engraved in send window and sends the first packet to opposite end network element 20 first time, wherein records the very first time stamp in expression first moment in the first packet.And carry out reference incorporated by reference to Fig. 4, wherein the first moment was t1.Send window is a parameter of the data volume size of the packet representing transmission in the Internet, send window increases, illustrate that the data quantitative change of the packet that transmitting terminal (being local terminal network element 10 in the present embodiment) sends is large, send window reduces, illustrate that the data volume of the packet that transmitting terminal sends reduces, send window is constant, illustrate that the data volume of the packet that transmitting terminal sends remains unchanged, and the embodiment of the present invention judges network congestion situation according to the first and second forward time delay values (hereinafter can introduce), and with this, send window is adjusted, to reduce rate of substitute, realize accurate transfer of data.
Step 302, the first packet that opposite end network element 20 sends at the second reception local terminal network element 10, second timestamp in expression second moment is deducted very first time stamp to obtain the first forward time delay value, the first forward time delay value is recorded in the second packet and is sent to local terminal network element 10.And carry out reference incorporated by reference to Fig. 4, wherein the second moment was t
2, the first forward time delay value is T
1.
Step 303, local terminal network element 10 receives the second packet that opposite end network element 20 sends, obtain the first forward time delay value from the second packet, and be engraved in the 3rd time in send window send the 3rd packet to opposite end network element 20, wherein record the 3rd timestamp in expression the 3rd moment in the 3rd packet.And carry out reference incorporated by reference to Fig. 4, wherein the 3rd moment was t
3.
Step 304, the 3rd packet that opposite end network element 20 sends at the 4th reception local terminal network element 10,4th timestamp in expression the 4th moment is deducted the 3rd timestamp to obtain the second forward time delay value, the second forward time delay value is recorded in the 4th packet and is sent to local terminal network element 10.And carry out reference incorporated by reference to Fig. 4, wherein the 4th moment was t4, and the second forward time delay value is T
2.
Step 305, local terminal network element 10 receives the 4th packet that opposite end network element 20 sends, and obtains the second forward time delay value, and adjust send window according to the difference of the second forward time delay value and the first forward time delay value from the 4th packet.
Local terminal network element 10 or opposite end network element 20 specifically can be the network equipments such as server, router, terminal, gateway.
In all of the embodiments of the present invention, first packet, the second packet, the 3rd packet and the 4th packet for example can be tcp data bag, particularly, can " option field " in TCP header data form modify, shown in amended " option field " table 1 specific as follows:
Table 1:
| Type | Length | Transmitting time is stabbed | Timestamp echo | The transmission and reception time difference |
| 1 bit | 1 bit | 4 bits | 4 bits | 2 bits |
As shown in table 1, sequentially carry out the information such as define styles, length, transmitting time stamp, timestamp echo, the transmission and reception time difference with a predetermined quantity bit.
The wherein delivery time of transmitting time stamp for representing packet, timestamp echo is for recording the delivery time of the packet received, and the transmission and reception time difference is for representing forward time delay value.
Specifically, local terminal network element 10 stabs with the data length record very first time of 4 bits in the transmitting time stamp option of the first packet; Opposite end network element 20 is after receiving the first packet, stab with the data length record very first time of 4 bits in the timestamp echo option of the second packet, and with the data length record first forward time delay value of 2 bits in the transmission and reception time difference option of the second packet.Similarly, local terminal network element 10 stabs in option in the transmitting time of the 3rd packet with data length record the 3rd timestamp of 4 bits; Opposite end network element 20 is after receiving the 3rd packet, with data length record the 3rd timestamp of 4 bits in the timestamp echo option of the 4th packet, and with the data length record second forward time delay value of 2 bits in the transmission and reception time difference option of the 4th packet.
In alternative of the present invention, first packet, the second packet, the 3rd packet and the 4th packet for example also can be ICMP(InternetControlMessageProtocol, ICMP) packet, specifically, can " Option Field " in ICMP header data form modify, wherein, consistent shown in the concrete set-up mode table 1 of " Option Field " in ICMP header data form, owing to being described in detail above, therefore repeat no more in this.
Certainly, above-mentioned first packet, the second packet, the 3rd packet and the 4th packet also can be the packet of extended formatting, such as IGMP(InternetGroupManagementProtocol, Internet Group Management Protocol) packet, UDP(UserDatagramProtocol, User Datagram Protocol) packet or HTTP(HyperTextTransferProtocol, HTML (Hypertext Markup Language)) packet.
Therefore, in the present embodiment, especially by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and according to the difference of the second forward time delay value and the first forward time delay value, send window is adjusted, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
Further, in the present embodiment, when not making time synchronized between local terminal network element 10 and opposite end network element 20, the clock of the two may be inconsistent.For example, suppose that t1 is 22:00 at local terminal network element 10 end, but at opposite end network element 20 end, owing to not making time synchronized, this t1 may be that the two clock is asynchronous for 22:01(), suppose that at opposite end network element 20, t2 be 22:02.When local terminal network element 10 does not make time synchronized with opposite end network element 20, the first forward time delay value that opposite end network element 20 is calculated is (22:02-22:00)=2 minute, its (22:01-22:00)=1 minute obtained with expectation has certain error, wherein this error can be described as clocking error, and this clocking error produces owing to not making time synchronized between local terminal network element 10 and opposite end network element 20.
In like manner, in the second forward time delay value, also there is this clocking error.Therefore, in the present embodiment, make use of the second forward time delay value deduct the first forward time delay value and obtain difference, and carry out send window adjustment according to this difference, thus the clocking error in the clocking error in the second forward time delay value and the second forward time delay value is cancelled out each other, to ensure that local terminal network element 10 can more adequately adjust send window.
It should be noted that in above-mentioned step 305, the difference according to the second forward time delay value and the first forward time delay value specifically comprises the step that send window adjusts:
When difference equals predetermined threshold, keep send window constant;
When difference is greater than predetermined threshold, reduce send window according to pre-defined algorithm;
When difference is less than predetermined threshold, increase send window according to pre-defined algorithm.
In a concrete execution mode, assuming that predetermined threshold is zero, now, the first forward time delay value that the first packet that local terminal network element 10 first time sends produces characterizes best network congestion degree, when the difference of the second forward time delay value and the first forward time delay value equals zero, illustrate that current network congestion degree does not change, therefore keep that send window is constant guarantees that data transmission bauds remains unchanged; When difference is greater than zero, second forward time delay value is larger than the first forward time delay value, illustrate that current network congestion degree starts to become large, delay time starts elongated, now can reduce send window according to pre-defined algorithm, thus reduce data traffic volume, to guarantee effectively to utilize limited bandwidth, guarantee that data transmission bauds remains unchanged; When difference is less than zero, the second forward time delay value is less than the first forward time delay value, illustrates that current network congestion degree starts to take a turn for the better, delay time starts to diminish, now can increase send window according to pre-defined algorithm, thus increase data traffic volume, to utilize limited bandwidth to greatest extent.
Certainly, above-mentioned predetermined threshold also can be set to other numerical value, and its concrete numerical value need carry out debugging according to concrete network environment and obtain, and the present invention does not do concrete restriction to it.
Further, above-mentioned pre-defined algorithm also needs to set according to actual needs, for example, when agreement predetermined threshold is zero, when difference equals 1, agreement reduces the data volume of send window 1Mbit, when difference equals 2, agreement reduces the data volume of send window 2Mbit ... analogize in this; In like manner, when difference equals-1, agreement increases the data volume of send window 1Mbit, and when difference equals-2, agreement increases the data volume of send window 2Mbit ... analogize in this.Pre-defined algorithm designed in the present invention can set according to different network environments.
Wherein, difference is that positive number illustrates that network is more congested than the last time, difference is that zero explanation network does not become congested, the available bandwidth also not reaching network is now described, flow can also be increased, increase send window, such as, forward delay inequality when network is very idle before and after it is 0, now can also increase flow.When difference is negative, illustrate that network congestion is in alleviation.Concrete window increases how many, reduce how much can select suitable adjustment mode according to real network, and the method for adjustment of optimum allows network window be stabilized on the maximum available bandwidth of network, therefore, above-mentioned method of adjustment is only a kind of execution mode that the present invention is contained, those skilled in the art can be arranged according to the network environment of reality, and the present invention is not construed as limiting this.
In an alternative embodiment, the second above-mentioned packet is specially the confirmation bag of the first packet, and the 4th packet is specially the confirmation bag of the 3rd packet.First forward time delay value or the second forward time delay value are recorded in and confirm bag by opposite end network element 20, efficiently utilize the affirmation mechanism in the network transmission protocol, can reduce the network bandwidth.
Below refer to Fig. 5, Fig. 5 is the schematic flow sheet of invention send window method of adjustment second execution mode, wherein, in this embodiment, mainly with local terminal network element 10 for main body describes.
As shown in Figure 5, the method comprises:
Step 401, local terminal network element 10 is engraved in send window and sends the first packet to opposite end network element 20 first time, wherein records the very first time stamp in expression first moment in the first packet;
Step 402, local terminal network element 10 receives the second packet that opposite end network element 20 sends, the the first forward time delay value recorded the second packet is obtained from the second packet, and be engraved in the 3rd time in send window send the 3rd packet to opposite end network element 20, wherein record the 3rd timestamp in expression the 3rd moment in the 3rd packet, and, first forward time delay value is that second timestamp in expression second moment is deducted very first time stamp gained by opposite end network element 20, and the second moment was the moment that opposite end network element 20 receives the first packet that local terminal network element 10 sends.
Step 403, local terminal network element 10 receives the 4th packet that opposite end network element 20 sends, the the second forward time delay value recorded the 4th packet is obtained from the 4th packet, and according to the difference of the second forward time delay value and the first forward time delay value, send window is adjusted, wherein, second forward time delay value is that the 4th timestamp in expression the 4th moment is deducted the 3rd timestamp gained by opposite end network element 20, and the 4th moment was the moment that opposite end network element 20 receives the 3rd packet that local terminal network element 10 sends.
Therefore, in the present embodiment, especially by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and according to the difference of the second forward time delay value and the first forward time delay value, send window is adjusted, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
And, in the present embodiment, make use of the second forward time delay value further and deduct the first forward time delay value, thus the clocking error in the clocking error in the second forward time delay value and the second forward time delay value is cancelled out each other, to guarantee more adequately to adjust send window.
It should be noted that in step 403, the difference according to the second forward time delay value and the first forward time delay value specifically comprises the step that send window adjusts:
When difference equals predetermined threshold, keep send window constant;
When difference is greater than predetermined threshold, reduce send window according to pre-defined algorithm;
When difference is less than predetermined threshold, increase send window according to pre-defined algorithm.
In a concrete execution mode, assuming that predetermined threshold is zero, now, the first forward time delay value that the first packet that local terminal network element 10 first time sends produces characterizes best network congestion degree, when the difference of the second forward time delay value and the first forward time delay value equals zero, illustrate that current network congestion degree does not change, therefore keep that send window is constant guarantees that data transmission bauds remains unchanged; When difference is greater than zero, second forward time delay value is larger than the first forward time delay value, illustrate that current network congestion degree starts to become large, delay time starts elongated, now can reduce send window according to pre-defined algorithm, thus reduce data traffic volume, to guarantee effectively to utilize limited bandwidth, guarantee that data transmission bauds remains unchanged; When difference is less than zero, the second forward time delay value is less than the first forward time delay value, illustrates that current network congestion degree starts to take a turn for the better, delay time starts to diminish, now can increase send window according to pre-defined algorithm, thus increase data traffic volume, to utilize limited bandwidth to greatest extent.
Certainly, above-mentioned predetermined threshold also can be set to other numerical value, and its concrete numerical value need carry out debugging according to concrete network environment and obtain, and the present invention does not do concrete restriction to it.
Further, above-mentioned pre-defined algorithm also needs to set according to actual needs, for example, can arrange predetermined threshold is zero, and when difference equals 1, agreement reduces the data volume of send window 1Mbit, when difference equals 2, agreement reduces the data volume of send window 2Mbit ... analogize in this; In like manner, when difference equals-1, agreement increases the data volume of send window 1Mbit, and when difference equals-2, agreement increases the data volume of send window 2Mbit ... analogize in this.Pre-defined algorithm designed in the present invention can set according to different network environments.
In an alternative embodiment, the second above-mentioned packet is specially the confirmation bag of the first packet, and the 4th packet is specially the confirmation bag of the 3rd packet.First forward time delay value or the second forward time delay value are recorded in and confirm bag by opposite end network element 20, efficiently utilize the affirmation mechanism in the network transmission protocol, can reduce the network bandwidth.
Below refer to Fig. 6, Fig. 6 is the schematic flow sheet of invention send window method of adjustment the 3rd execution mode, wherein, in this embodiment, mainly with opposite end network element 20 for main body describes.
As shown in Figure 6, the method comprises:
Step 501, the first packet that opposite end network element 20 sends at the second reception local terminal network element 10, second timestamp in expression second moment is deducted record in the first packet the very first time stamp to obtain the first forward time delay value, first forward time delay value is recorded in the second packet and is sent to local terminal network element 10, wherein, the very first time, stamp was for representing for the first moment, and the first moment was that local terminal network element 10 when sending the first packet to opposite end network element 20 in send window.
Step 502, the 3rd packet that opposite end network element 20 sends at the 4th reception local terminal network element 10,4th timestamp in expression the 4th moment is deducted the 3rd timestamp that records in the 3rd packet to obtain the second forward time delay value, the second forward time delay value is recorded in the 4th packet and is sent to local terminal network element 10; Wherein, the 3rd timestamp is for representing for the 3rd moment, and the 3rd moment was that local terminal network element 10 when sending the 3rd packet to opposite end network element 20 in send window.
Wherein, the second packet is specially the confirmation bag of the first packet, and the 4th packet is specially the confirmation bag of the 3rd packet.
Therefore, in the present embodiment, especially by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and respectively the second forward time delay value and the first forward time delay value are sent to local terminal network element 10, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
Below refer to Fig. 7, Fig. 7 is the structural representation of local terminal network element first execution mode of the present invention.As shown in Figure 7, local terminal network element 10 comprises packet-receiving module 101, packet-receiving module 102 and send window adjusting module 103.
Packet Generation module 101 sends the first packet to opposite end network element 20 for being engraved in send window first time, wherein records the very first time stamp in expression first moment in the first packet;
The second packet that packet-receiving module 102 sends for receiving opposite end network element 20, the the first forward time delay value recorded the second packet is obtained from the second packet, and be engraved in the 3rd time in send window send the 3rd packet to opposite end network element 20, wherein record the 3rd timestamp in expression the 3rd moment in the 3rd packet, and, first forward time delay value is that second timestamp in expression second moment is deducted very first time stamp gained by opposite end network element 20, and the second moment was the moment that opposite end network element 20 receives the first packet that local terminal network element 10 sends;
Packet-receiving module 102 is further used for the 4th packet receiving opposite end network element 20 transmission, obtains from the 4th packet the second forward time delay value recorded the 4th packet;
Send window adjusting module 103 is for adjusting send window according to the difference of the second forward time delay value and the first forward time delay value, wherein, second forward time delay value is that the 4th timestamp in expression the 4th moment is deducted the 3rd timestamp gained by opposite end network element 20, and the 4th moment was the moment that opposite end network element 20 receives the 3rd packet that local terminal network element 10 sends.
Therefore, in the present embodiment, especially by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and according to the difference of the second forward time delay value and the first forward time delay value, send window is adjusted, only using forward time delay value as the unique parameters adjusting send window, thus the result of send window adjustment accurately can be obtained.
And, in the present embodiment, make use of the second forward time delay value further and deduct the first forward time delay value, thus the clocking error in the clocking error in the second forward time delay value and the second forward time delay value is cancelled out each other, to guarantee more adequately to adjust send window.
Wherein, send window adjusting module 103 specifically for:
When difference equals predetermined threshold, keep send window constant;
When difference is greater than predetermined threshold, reduce send window according to pre-defined algorithm;
When difference is less than predetermined threshold, increase send window according to pre-defined algorithm.
In a concrete execution mode, assuming that predetermined threshold is zero, now, the first forward time delay value that the first packet that Packet Generation module 101 first time sends produces characterizes best network congestion degree, when the difference of the second forward time delay value and the first forward time delay value equals zero, illustrate that current network congestion degree does not change, therefore keep that send window is constant guarantees that data transmission bauds remains unchanged; When difference is greater than zero, second forward time delay value is larger than the first forward time delay value, illustrate that current network congestion degree starts to become large, delay time starts elongated, now can reduce send window according to pre-defined algorithm, thus reduce data traffic volume, to guarantee effectively to utilize limited bandwidth, guarantee that data transmission bauds remains unchanged; When difference is less than zero, the second forward time delay value is less than the first forward time delay value, illustrates that current network congestion degree starts to take a turn for the better, delay time starts to diminish, now can increase send window according to pre-defined algorithm, thus increase data traffic volume, to utilize limited bandwidth to greatest extent.
Certainly, above-mentioned predetermined threshold also can be set to other numerical value, and its concrete numerical value need carry out debugging according to concrete network environment and obtain, and the present invention does not do concrete restriction to it.
Further, above-mentioned pre-defined algorithm can set according to actual needs, for example, can arrange predetermined threshold is zero, and when difference equals 1, agreement reduces the data volume of send window 1Mbit, when difference equals 2, agreement reduces the data volume of send window 2Mbit ... so analogize; In like manner, when difference equals-1, agreement increases the data volume of send window 1Mbit, and when difference equals-2, agreement increases the data volume of send window 2Mbit ... so analogize.Pre-defined algorithm designed in the present invention can set according to different network environments.
In an alternative embodiment, the second above-mentioned packet is specially the confirmation bag of the first packet, and the 4th packet is specially the confirmation bag of the 3rd packet.First forward time delay value or the second forward time delay value are recorded in and confirm bag by opposite end network element 20, efficiently utilize the affirmation mechanism in the network transmission protocol, can reduce the network bandwidth.
Below refer to Fig. 8, Fig. 8 is the structural representation of opposite end of the present invention network element first execution mode.As shown in Figure 7, opposite end network element 20 comprises Packet Generation module 201, packet-receiving module 202 and timestamp processing module 203.
First packet of packet-receiving module 202 for sending at the second reception local terminal network element 10;
Timestamp processing module 203 is stabbed for second timestamp in expression second moment being deducted the very first time of recording in the first packet to obtain the first forward time delay value;
Packet Generation module 203 is for being recorded in the second packet by the first forward time delay value and being sent to local terminal network element 10, wherein, the very first time, stamp was for representing for the first moment, and the first moment was that local terminal network element 10 when sending the first packet to opposite end network element 20 in send window;
Packet-receiving module 202 is further used for the 3rd packet sent at the 4th reception local terminal network element 10, timestamp processing module 203 is further used for the 4th timestamp in expression the 4th moment to deduct the 3rd timestamp that records in the 3rd packet to obtain the second forward time delay value, and Packet Generation module 201 is further used for the second forward time delay value being recorded in the 4th packet and being sent to local terminal network element 10; Wherein, the 3rd timestamp is for representing for the 3rd moment, and the 3rd moment was that local terminal network element 10 when sending the 3rd packet to opposite end network element 20 in send window;
Therefore, in the present embodiment, especially by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and respectively the second forward time delay value and the first forward time delay value are sent to local terminal network element 10, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
Below refer to Fig. 9, Fig. 9 is the structural representation of local terminal network element second execution mode of the present invention.As shown in Figure 9, local terminal network element 10 comprises processor 601, memory 602, network interface 603 and bus 604, and wherein, processor 601, memory 602, network interface 603 are of coupled connections with bus 604 respectively, to carry out data interaction.
Network interface 603 sends the first packet to opposite end network element 20 for being engraved in send window first time, wherein records the very first time stamp in expression first moment in the first packet;
Network interface 603 is further used for the second packet receiving opposite end network element 20 transmission, the the first forward time delay value recorded the second packet is obtained from the second packet, and be engraved in the 3rd time in send window send the 3rd packet to opposite end network element 20, wherein record the 3rd timestamp in expression the 3rd moment in the 3rd packet, and, first forward time delay value is that second timestamp in expression second moment is deducted very first time stamp gained by opposite end network element 20, and the second moment was the moment that opposite end network element 20 receives the first packet that local terminal network element 10 sends; And receive the 4th packet of opposite end network element 20 transmission, obtain from the 4th packet the second forward time delay value recorded the 4th packet;
Memory 602 has program stored therein, and this program is used for adjusting send window according to the difference of the second forward time delay value and the first forward time delay value.Wherein, the second forward time delay value is that the 4th timestamp in expression the 4th moment is deducted the 3rd timestamp gained by opposite end network element 20, and the 4th moment was the moment that opposite end network element 20 receives the 3rd packet that local terminal network element 10 sends.
Therefore, in the present embodiment, especially by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and according to the difference of the second forward time delay value and the first forward time delay value, send window is adjusted, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
And, in the present embodiment, make use of the second forward time delay value further and deduct the first forward time delay value, thus the clocking error in the clocking error in the second forward time delay value and the second forward time delay value is cancelled out each other, to guarantee more adequately to adjust send window.
Wherein, this program specifically comprises:
When difference equals predetermined threshold, keep send window constant;
When difference is greater than predetermined threshold, reduce send window according to pre-defined algorithm;
When difference is less than predetermined threshold, increase send window according to pre-defined algorithm.
In a concrete execution mode, assuming that predetermined threshold is zero, now, the first forward time delay value that the first packet that network interface 603 first time sends produces characterizes best network congestion degree, when the difference of the second forward time delay value and the first forward time delay value equals zero, illustrate that current network congestion degree does not change, therefore keep that send window is constant guarantees that data transmission bauds remains unchanged; When difference is greater than zero, second forward time delay value is larger than the first forward time delay value, illustrate that current network congestion degree starts to become large, delay time starts elongated, now can reduce send window according to pre-defined algorithm, thus reduce data traffic volume, to guarantee effectively to utilize limited bandwidth, guarantee that data transmission bauds remains unchanged; When difference is less than zero, the second forward time delay value is less than the first forward time delay value, illustrates that current network congestion degree starts to take a turn for the better, delay time starts to diminish, now can increase send window according to pre-defined algorithm, thus increase data traffic volume, to utilize limited bandwidth to greatest extent.
Certainly, above-mentioned predetermined threshold also can be set to other numerical value, and its concrete numerical value need carry out debugging according to concrete network environment and obtain, and the present invention does not do concrete restriction to it.
Further, above-mentioned pre-defined algorithm can set according to actual needs, for example, can arrange predetermined threshold is zero, and when difference equals 1, agreement reduces the data volume of send window 1Mbit, when difference equals 2, agreement reduces the data volume of send window 2Mbit ... analogize in this; In like manner, when difference equals-1, agreement increases the data volume of send window 1Mbit, and when difference equals-2, agreement increases the data volume of send window 2Mbit ... analogize in this.Pre-defined algorithm designed in the present invention can set according to different network environments.
In an alternative embodiment, the second above-mentioned packet is specially the confirmation bag of the first packet, and the 4th packet is specially the confirmation bag of the 3rd packet.First forward time delay value or the second forward time delay value are recorded in and confirm bag by opposite end network element 20, efficiently utilize the affirmation mechanism in the network transmission protocol, can reduce the network bandwidth.
Below refer to Figure 10, Figure 10 is the structural representation of opposite end of the present invention network element second execution mode.As shown in Figure 10, opposite end network element 20 comprises processor 701, memory 702, network interface 703 and bus 704, and wherein, processor 701, memory 702, network interface 703 are of coupled connections with bus 704 respectively, to carry out data interaction.
First packet of network interface 703 for sending at the second reception local terminal network element 10;
Memory 702 has program stored therein, and this program comprises: second timestamp in expression second moment is deducted record in the first packet the very first time stamp to obtain the first forward time delay value;
Network interface 703 is for being recorded in the second packet by the first forward time delay value and being sent to local terminal network element 10, wherein, the very first time, stamp was for representing for the first moment, and the first moment was that local terminal network element 10 when sending the first packet to opposite end network element 20 in send window;
Network interface 703 is further used for the 3rd packet sent at the 4th reception local terminal network element 10, this program is further used for the 4th timestamp in expression the 4th moment to deduct the 3rd timestamp that records in the 3rd packet to obtain the second forward time delay value, and network interface 703 is further used for the second forward time delay value being recorded in the 4th packet and being sent to local terminal network element 10; Wherein, the 3rd timestamp is for representing for the 3rd moment, and the 3rd moment was that local terminal network element 10 when sending the 3rd packet to opposite end network element 20 in send window;
Processor 701 runs said procedure.
Therefore, in the present embodiment, especially by recording very first time stamp in the first packet, deduct very first time stamp with the second timestamp and obtain the first forward time delay value, by recording the 3rd timestamp in the 3rd packet, deduct the 3rd timestamp with the 4th timestamp and obtain the second forward time delay value, and respectively the second forward time delay value and the first forward time delay value are sent to local terminal network element 10, can using the forward time delay value relevant with network congestion situation as the major parameter adjusting send window, avoid introducing the ACK time of delay irrelevant with network congestion situation and reverse time delay value, thus obtain the result of send window adjustment accurately.
The foregoing is only embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a send window method of adjustment, is characterized in that, comprising:
Local terminal network element is engraved in send window and sends the first packet to opposite end network element first time, records the very first time stamp representing described first moment in wherein said first packet;
Described local terminal network element receives the second packet that described opposite end network element sends, the the first forward time delay value recorded described second packet is obtained from described second packet, and the 3rd time, be engraved in transmission the 3rd packet extremely described opposite end network element in described send window, the 3rd timestamp representing described 3rd moment is recorded in wherein said 3rd packet, wherein, described first forward time delay value is that second timestamp in expression second moment is deducted stamp gained of the described very first time by described opposite end network element, described second moment is the moment that described opposite end network element receives described first packet that described local terminal network element sends,
Described local terminal network element receives the 4th packet that described opposite end network element sends, the the second forward time delay value recorded described 4th packet is obtained from described 4th packet, and according to the difference of described second forward time delay value and described first forward time delay value, described send window is adjusted, wherein, described second forward time delay value is that the 4th timestamp in expression the 4th moment is deducted described 3rd timestamp gained by described opposite end network element, and described 4th moment is the moment that described opposite end network element receives described 3rd packet that described local terminal network element sends.
2. method according to claim 1, is characterized in that, the described difference according to described second forward time delay value and described first forward time delay value adjusts described send window, comprising:
When described difference equals predetermined threshold, keep described send window constant;
When described difference is greater than described predetermined threshold, reduce described send window according to pre-defined algorithm;
When described difference is less than described predetermined threshold, increase described send window according to described pre-defined algorithm.
3. a send window method of adjustment, is characterized in that, comprising:
The first packet that opposite end network element sends at the second reception local terminal network element, to represent that second timestamp in described second moment deducts the very first time stamp that records in described first packet to obtain the first forward time delay value, described first forward time delay value is recorded in the second packet and is sent to described local terminal network element, wherein, described very first time, stamp was for representing for the first moment, and described first moment is that described local terminal network element when sending described first packet to described opposite end network element in send window;
Described opposite end network element the 3rd packet that local terminal network element sends described in the 4th reception, by representing that the 4th timestamp in described 4th moment deducts the 3rd timestamp that records in described 3rd packet to obtain the second forward time delay value, described second forward time delay value being recorded in the 4th packet and being sent to described local terminal network element; Wherein, described 3rd timestamp for representing for the 3rd moment, described 3rd moment be described local terminal network element send in described send window described 3rd packet to described opposite end network element when.
4. method according to claim 3, is characterized in that, described second packet is specially the confirmation bag of described first packet, and described 4th packet is specially the confirmation bag of described 3rd packet.
5. a local terminal network element, is characterized in that, comprising:
Packet Generation module, sends the first packet to opposite end network element for being engraved in send window first time, records the very first time stamp representing described first moment in wherein said first packet;
Packet-receiving module, for receiving the second packet that described opposite end network element sends, the the first forward time delay value recorded described second packet is obtained from described second packet, and the 3rd time, be engraved in transmission the 3rd packet extremely described opposite end network element in described send window, the 3rd timestamp representing described 3rd moment is recorded in wherein said 3rd packet, and, described first forward time delay value is that second timestamp in expression second moment is deducted stamp gained of the described very first time by described opposite end network element, described second moment is the moment that described opposite end network element receives described first packet that described local terminal network element sends,
Described packet-receiving module is further used for the 4th packet receiving the network element transmission of described opposite end, obtains from described 4th packet the second forward time delay value recorded described 4th packet;
Send window adjusting module, for adjusting described send window according to the difference of described second forward time delay value and described first forward time delay value, wherein, described second forward time delay value is that the 4th timestamp in expression the 4th moment is deducted described 3rd timestamp gained by described opposite end network element, and described 4th moment is the moment that described opposite end network element receives described 3rd packet that described local terminal network element sends.
6. local terminal network element according to claim 5, is characterized in that, described send window adjusting module is used for:
When described difference equals predetermined threshold, keep described send window constant;
When described difference is greater than described predetermined threshold, reduce described send window according to pre-defined algorithm;
When described difference is less than described predetermined threshold, increase described send window according to described pre-defined algorithm.
7. an opposite end network element, is characterized in that, comprising:
Packet-receiving module, for the first packet sent at the second reception local terminal network element;
Timestamp processing module, stabs for second timestamp in expression described second moment being deducted the very first time of recording in described first packet to obtain the first forward time delay value;
Packet Generation module, for described first forward time delay value being recorded in the second packet and being sent to described local terminal network element, wherein, described very first time, stamp was for representing for the first moment, and described first moment is that described local terminal network element when sending described first packet to described opposite end network element in send window;
Described packet-receiving module is further used for the 3rd packet that local terminal network element sends described in the 4th reception, described timestamp processing module is further used for representing that the 4th timestamp in described 4th moment deducts the 3rd timestamp that records in described 3rd packet to obtain the second forward time delay value, and described Packet Generation module is further used for described second forward time delay value being recorded in the 4th packet and being sent to described local terminal network element; Wherein, described 3rd timestamp for representing for the 3rd moment, described 3rd moment be described local terminal network element send in described send window described 3rd packet to described opposite end network element when.
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| CN104618258B (en) * | 2015-02-05 | 2017-12-01 | 成都金本华科技股份有限公司 | A kind of control method of message transmission rate |
| CN106211306B (en) * | 2015-04-30 | 2020-04-03 | 华为技术有限公司 | Communication network delay jitter smoothing method, device and system |
| CN106549876A (en) * | 2015-09-22 | 2017-03-29 | 中兴通讯股份有限公司 | Based on the method for controlling network congestion of ICAP agreements, device and client |
| CN105827537B (en) * | 2016-06-01 | 2018-12-07 | 四川大学 | A kind of congestion improved method based on QUIC agreement |
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