CN103905328A - Data transmission control system and method and related equipment - Google Patents
Data transmission control system and method and related equipment Download PDFInfo
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- CN103905328A CN103905328A CN201210572735.2A CN201210572735A CN103905328A CN 103905328 A CN103905328 A CN 103905328A CN 201210572735 A CN201210572735 A CN 201210572735A CN 103905328 A CN103905328 A CN 103905328A
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Abstract
The invention discloses a data transmission control system and method and related equipment for reasonably controlling the data transmission rate in a wireless network and ensuring the reliability of wireless network data transmission. The system comprises a transmitting end device, at least one intermediate network transmission device, and a receiving end device. The transmitting end device is used to send a data packet to the receiving end device through the at least one intermediate network transmission device, wherein the data packet carries the current RTT information and congestion window adjustment information, and the transmitting end device is used to update the current congestion window according to the congestion window adjustment information carried in the received ACK data packet. Each intermediate network transmission device is used to redefine the congestion window adjustment information after the data packet is received, if the refined congestion window adjustment information is less than the congestion window adjustment information carried in the data packet, then the congestion window adjustment information carried in the data packet is replaced with the refined congestion window adjustment information. The receiving end device is used to read the congestion window adjustment information in the received data packet and write the read congestion window adjustment information into the ACK data packet and return to the transmitting end device.
Description
Technical field
The present invention relates to wireless network transmissions control technology field, relate in particular to a kind of data transfer control system, method and relevant apparatus.
Background technology
Traditional transmission control protocol (Transmission Control Protocol, TCP) use traffic controlling mechanism is soundd out the network bandwidth, in the time detecting Network Packet Loss, thereby thinks that the transmission rate of congested reduction transmitting terminal occurs network.At WLAN (wireless local area network) (Wireless Local Area Network, WLAN) in wireless channel, the higher error rate and the mobility of terminal can cause that transmission is interrupted and packet loss frequently, in this case, can think that according to TCP flow control mechanism the congested data transmission rate that starts congestion control mechanism and reduce transmitting terminal has occurred network, transmission rate is contained on a lower grade for a long time, thereby can not makes full use of the remaining bandwidth of network, cause the waste of Internet resources.
For the problems referred to above, prior art has proposed following solution, wireless router buffer memory is sent to the packet of terminal by server, in the time there is the data packet loss of wireless link, terminal sends repeat requests to wireless router, wireless router receives after repeat requests, the packet of retransmission of lost.This scheme adopts wireless router buffer memory and retransmission data packet may, compared with terminal to server requesting retransmission data bag, has reduced the time delay of repeat requests bag and retransmission data packet may, has accelerated the speed retransmitting.In addition, by intermediate router, server is shielded to repeat requests bag, avoided server to receive that repeat requests bag causes transmission rate reduction of speed.
But, in above-mentioned solution, sent to the packet of terminal by server by wireless router buffer memory, require wireless router to there is larger spatial cache, this makes wireless router become the congested dangerous network element of generation, in addition the management of mass data bag is increased the weight of the processing load of wireless router, easily made wireless router become the bottleneck network element of network rate bottleneck, affected the reliability of wireless network.
Summary of the invention
The embodiment of the present invention provides a kind of data transfer control system, method and relevant apparatus, in order to the message transmission rate in reasonable control wireless network, and guarantees the reliability that wireless network data transmits.
The embodiment of the present invention provides a kind of data transfer control system, comprises sending ending equipment, receiving device and at least one go-between transmission equipment, wherein,
Described sending ending equipment, for sending packet by described at least one go-between transmission equipment to described sending ending equipment successively, carries current data packet transmission round-trip delay RTT information and congestion window adjustment information in described packet; And receive that described receiving device returns reply ack msg bag after, upgrade current congestion window according to the congestion window adjustment information of carrying in described ack msg bag;
Each go-between transmission equipment, for after receiving described packet, redefine according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding; If when the congestion window adjustment information redefining out is less than the congestion window adjustment information of carrying in described packet, use the congestion window adjustment information redefining out to replace the congestion window adjustment information of carrying in described packet;
Described receiving device, for after receiving described packet, reads the congestion window adjustment information of carrying in described packet; And the congestion window adjustment information reading is write in the ack msg bag of described packet and return to described sending ending equipment.
The embodiment of the present invention provides a kind of data transfer control method, comprising:
Send packet by least one go-between transmission equipment to receiving device successively, in described packet, carry current data packet transmission round-trip delay RTT information and the first congestion window adjustment information;
What receive the described packet that returns of receiving device replys ack msg bag, in described ack msg bag, carry the second congestion window adjustment information, described the second congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, redefine out and send to described receiving device according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Upgrade current congestion window according to described the second congestion window adjustment information.
The embodiment of the present invention provides a kind of data transfer controller, comprising:
Transmitting element, for sending packet by least one go-between transmission equipment to receiving device successively, carries current data packet transmission round-trip delay RTT information and the first congestion window adjustment information in described packet;
Receiving element, reply ack msg bag for what receive described packet that receiving device returns, in described ack msg bag, carry the second congestion window adjustment information, described the second congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, redefine out and send to described receiving device according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Updating block, for upgrading current congestion window according to described the second congestion window adjustment information.
The embodiment of the present invention provides another data transfer control method, comprising:
Receive packet, in described packet, carry current data packet transmission round-trip delay RTT information and congestion window adjustment information;
Redefine according to the RTT information of carrying in the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding;
If when the congestion window adjustment information redefining out is less than the congestion window adjustment information of carrying in described packet, use the congestion window adjustment information redefining out to replace the congestion window adjustment information of carrying in described packet.
The embodiment of the present invention provides another data transmission device, comprising:
Receiving element, for receiving packet, carries current data packet transmission round-trip delay RTT information and congestion window adjustment information in described packet;
Determining unit, redefines for the RTT information of carrying according to the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding;
Updating block, if while being less than for the congestion window adjustment information redefining out the congestion window adjustment information that described packet carries, replaces the congestion window adjustment information of carrying in described packet by the congestion window adjustment information redefining out.
The embodiment of the present invention also provides a kind of data transfer control method, comprising:
The packet that receiving end/sending end equipment sends by least one go-between transmission equipment successively, in described packet, carry the current congestion window adjustment information of described packet, described congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, determine according to the transmission round-trip delay RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Read described congestion window adjustment information;
The congestion window adjustment information reading is carried to replying of described packet and in ack msg bag, returns to described sending ending equipment.
The embodiment of the present invention also provides a kind of data transfer controller, comprising:
Receiving element, the packet sending by least one go-between transmission equipment successively for receiving end/sending end equipment, in described packet, carry the current congestion window adjustment information of described packet, described congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, determine according to the transmission round-trip delay RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Reading unit, for reading described congestion window adjustment information;
Transmitting element, returns to described sending ending equipment for the ack msg bag of replying that the congestion window adjustment information reading is carried to described packet.
The data transmission system that the embodiment of the present invention provides, method and relevant apparatus, sending ending equipment is in the time sending packet, in this packet, carry current RTT information and congestion window adjustment information, after each go-between transmission equipment receives this packet, redefine congestion window adjustment information according to the input rate of self current link bandwidth and data packet transmission sequence, if when the congestion window adjustment information of determining is less than the congestion window adjustment information of carrying in this packet, replace the congestion window adjustment information of carrying in this packet by the congestion window adjustment information redefining out, in the time that packet finally arrives receiving terminal, the congestion window adjustment information of carrying in packet is the minimum congestion window adjustment information of determining on whole transmission path, receiving terminal is carried at the congestion window adjustment information of carrying in packet in reply data bag and returns to sending ending equipment, sending ending equipment upgrades self current congestion window according to the congestion window adjustment information of carrying in reply data bag.In said process, because congestion window adjustment information is determined according to the actual congestion state of go-between transmission equipment, thereby the congested adjustment window information of determining can reflect physical link situation, like this, can make full use of data transfer bandwidth resource, avoid the waste of Internet resources, make Data Transmission Controlling more reasonable, simultaneously, the packet that go-between transmission equipment sends without buffer memory sending ending equipment, avoid its bottleneck that becomes Internet Transmission, guaranteed the reliability of wireless network data transmission.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in write specification, claims and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is in the embodiment of the present invention, the structural representation of data transfer control system;
Fig. 2 is in the embodiment of the present invention, the implementing procedure schematic diagram of transmitting terminal side data transfer control method;
Fig. 3 is in the embodiment of the present invention, the structural representation of transmitting terminal side data transmission control unit;
Fig. 4 is in the embodiment of the present invention, the schematic flow sheet of go-between transmission equipment implementation data transfer control method;
Fig. 5 is in the embodiment of the present invention, the structural representation of go-between transmission equipment side data transmission control unit;
Fig. 6 is in the embodiment of the present invention, the schematic flow sheet of receiving device implementation data transfer control method;
Fig. 7 is in the embodiment of the present invention, the structural representation of receiving device side data transmission control unit.
Embodiment
In order to realize the message transmission rate in reasonable control infinite network, guarantee the object of the reliability of infinite network transfer of data, the embodiment of the present invention provides a kind of data transfer control system, method and relevant apparatus.
Below in conjunction with Figure of description, the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein is only for description and interpretation the present invention, be not intended to limit the present invention, and in the situation that not conflicting, the feature in embodiment and embodiment in the present invention can combine mutually.
In order rationally to control wireless network data transmission rate, avoid irrational reduction of speed.In the embodiment of the present invention, sending ending equipment, in the time sending packet, increases a new packet header in this packet, for convenience of description, claims that this packet header newly increasing is Flow Control packet header in the embodiment of the present invention.In Flow Control packet header, can be, but not limited to comprise following three fields: congestion window W, data packet transmission RTT(round-trip delay) and congestion window adjustment information dw, sending ending equipment is by increasing or reduce congestion window W and adjust the transmission rate of packet, as shown in table 1, it is a kind of possible data structure in Flow Control packet header:
| W | RTT | dW |
Wherein, field W and RTT are determined by sending ending equipment, sending ending equipment is in the time sending packet, W is set to congestion window currency, and RTT is set to the round-trip delay that sending ending equipment is estimated, W and RTT remain unchanged on transmission path, dw is the adjusted value of congestion window, when initialization packet, the value that sending ending equipment can arrange dw is 0, in transmission of data packets, is rewritten by each go-between transmission equipment.Preferably, the input rate of go-between transmission equipment comparing data bag place transfer of data sequence and self current available link bandwidth, if input rate is greater than current available link bandwidth, excess load of this go-between transmission equipment is described, should notify sending ending equipment to reduce the transmission rate of packet, if input rate is less than current available link bandwidth, illustrate that go-between transmission equipment also has remaining bandwidth, should notify sending ending equipment to improve data package transmission velocity.When concrete enforcement, go-between transmission equipment can be according to the input rate of packet place transfer of data sequence, with the RTT value of carrying in self current available link bandwidth and packet, dw is adjusted, each go-between transmission equipment is after receiving packet, be and redefine dw, if when the dw determining is less than the dw carrying in packet, by the dw in replacement data bag, like this, in the time that data packet transmission arrives receiving device, the dw value of wherein carrying will be a minimum value (being go-between transmission equipment the most congested on transmission path writes) on transmission path, receiving device is carried at the dw value of carrying in the packet receiving in the ack msg bag of this packet and returns to sending ending equipment, like this, sending ending equipment can be adjusted its data packet sending speed (realizing by adjusting congestion window) according to the dw value of carrying in ACk packet, in said process, because dw value is determined according to the actual load state of self for each go-between transmission equipment, can accurately reflect the congestion situation of each go-between transmission equipment, thereby, make sending ending equipment more reasonable to the control of data package transmission velocity.
Based on above-mentioned analysis, the embodiment of the present invention provides a kind of data transfer control system, as shown in Figure 1, the structural representation of its data transfer control system providing for the embodiment of the present invention, comprise: sending ending equipment 101, receiving device 102 and at least one go-between transmission equipment 103, wherein:
Sending ending equipment 101, for sending packet by least one go-between transmission equipment 103 to receiving device 102 successively; And reply receiving the ACK(that receiving terminal 102 equipment return) after packet, upgrade current congestion window according to the congestion window adjustment information of carrying in ack msg bag;
Wherein, in packet, carry current data packet transmission round-trip delay RTT information and congestion window adjustment information; When concrete enforcement, sending ending equipment 101, before sending packet, first writes the current RTT value of congestion window value and self estimation in w and RTT field.
Each go-between transmission equipment 103, for after receiving packet, redefine according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and packet the congestion window adjustment information that packet is corresponding; If when the congestion window adjustment information redefining out is less than the congestion window adjustment information of carrying in packet, by the congestion window adjustment information of carrying in the congestion window adjustment information replacement data bag redefining out;
When concrete enforcement, each go-between transmission equipment on transmission path, in the time that it receives packet, determine dw value according to input rate and the available link bandwidth of RTT and the transfer of data sequence of self, if be less than the dw field value carrying in packet, the dw value of carrying in the dw value replacement data bag of determining with self.
Receiving device 102, for after receiving packet, the congestion window adjustment information of carrying in read data packet; And the congestion window adjustment information reading is write in the ack msg bag of this packet and return to sending ending equipment 101.
When concrete enforcement, sending ending equipment 101 is after receiving the ack msg bag that receiving device 102 returns, can be according to following formula correction congestion window, and send packet with new congestion window: MAX (P, W+dw), wherein, MAX represents to get maxima operation, P is the length (can be specifically the length of the packet take byte as unit) of current data to be transmitted bag, and W is the congestion window before upgrading.
Preferably, can redefine the congestion window adjustment information that described packet is corresponding according to following formula: dw=(r-r
i) * RTT; Wherein: dw is congestion window adjustment information corresponding to this packet of again determining; R is the current available link bandwidth of go-between transmission equipment 103; r
ifor the input rate of go-between transmission equipment 103 current data packet transfer sequences; RTT is current data packet transmission RTT.
More preferably, because the modification of congestion window need to just can feed back to sending ending equipment 101 through a RTT duration, therefore, in practical application, congestion window correction lags behind the state of router, in addition, the queuing of packet in data transmission queue also increased the risk of congested generation, for fear of go-between transmission equipment because of overload cause congested, in the embodiment of the present invention, can be by redefine the congestion window adjustment information that described packet is corresponding according to following formula: dw=(r-r
i) * RTT-L, L is the length of packet place data packet transmission sequence.Like this, the remaining bandwidth of go-between transmission equipment 103 leaves surplus, can compensate the consumption that its transfer of data sequence is queued up, and reduces the probability of congested generation.
When concrete enforcement, when only there is a packet transfer sequence on middle web-transporting device 103, therefore, if it is less than the dw value of carrying in packet, 103 of go-between transmission equipments need to write Flow Control packet header by the value of the dw determining.
But actual conditions are on the contrary, on a go-between transmission equipment 103, may there are multiple data packet transmission sequences simultaneously, if while there is multiple data packet transmission sequence on go-between transmission equipment 103, preferably, can singly be not limited to the QoS(service quality corresponding according to each data packet transmission sequence) grade distributes the dw value of determining between each data packet transmission sequence.
If the QoS grade difference that each data packet transmission sequence is corresponding, go-between transmission equipment 103 can be determined dw value corresponding to packet receiving according to following steps:
Step 1, for each data packet transmission sequence, be defined as according to QoS class information corresponding to this data packet transmission sequence and bandwidth demand information the bandwidth that this data packet transmission sequence is distributed;
When concrete enforcement, go-between transmission equipment 103 can be determined the allocated bandwidth ratio between each data packet transmission sequence according to QoS grade corresponding to each data packet transmission sequence and bandwidth demand, to exist three packet transfer sequences to describe as example on go-between transmission equipment 103, suppose that allocated bandwidth that go-between transmission equipment 103 determines according to QoS grade corresponding to each data packet transmission sequence and bandwidth demand is than being X: Y: Z, and the corresponding weights Z of the data packet transmission sequence at the packet place that receives of current intermediary network device 103, the bandwidth of this packet place data packet transmission sequence allocation is current available bandwidth so
Step 2, the bandwidth that is defined as this data packet transmission sequence allocation account for the ratio of current available bandwidth;
Continuation of the previous cases, the ratio that accounts for current available bandwidth for the bandwidth of this data packet transmission sequence allocation is
Step 3, the following formula of basis are determined the congestion window adjustment information that this data packet transmission sequence is corresponding:
Wherein: dw
jbe the j article of congestion window adjustment information that packet transfer sequence is corresponding; R is the current available link bandwidth of go-between transmission equipment 103; r
iathe input rate sum of all data packet transmission sequences that comprise for go-between transmission equipment 103;
the average of data packet transmission RTT in the each data packet transmission sequence comprising for go-between transmission equipment; t
jfor go-between transmission equipment is the ratio that bandwidth that j article of packet transfer sequence distributes accounts for current available bandwidth, according to upper example,
The congestion window adjustment information corresponding to transfer of data sequence at step 4, specified data bag place is the congestion window adjustment information that this packet is corresponding.
The dw determining
jbe the dw value that this packet is corresponding, if be less than the value of field dw in packet, replace original dw value by writing field dw.
Equally, cause the congested risk that may exist for fear of the state that lags behind go-between transmission equipment 103 due to congested serial ports correction, preferably, in the embodiment of the present invention, go-between transmission equipment 103 can be determined the congestion window adjustment information that this data packet transmission sequence is corresponding according to following formula
l
jbe the length of j article of packet transfer sequence.
If the QoS grade identical (as being all try one's best (best-effort)) that each data packet transmission sequence is corresponding, by the go-between transmission equipment 103 dw value that mean allocation is determined between each data packet transmission sequence.
When concrete enforcement, if the value of the dw determining is for just (being greater than 0), illustrate that go-between transmission equipment 103 also has remaining bandwidth, thereby sending ending equipment 101 will increase congestion window and improve data package transmission velocity, if the value of the dw determining is negative (being greater than 0), go-between transmission equipment 103 excess load is described, sending ending equipment 101 will reduce congestion window to reduce data package transmission velocity.From said process, in the time through one to two RTT, the data package transmission velocity of sending ending equipment 101 can approach the saturation condition of link.
Especially, when concrete enforcement, if sending ending equipment 101 sends packet, overtime (within the time of setting, not receiving the ack msg bag that receiving device 102 returns) or receives at least two repeat ACK packets continuously, the data-bag lost sending before thinking or occur congested.Concrete, for above two kinds of situations, in the embodiment of the present invention, can process in accordance with the following methods respectively:
One, sending ending equipment 101 received at least two repeat ACK packets that packet is corresponding before default time-out time arrives
This situation, sending ending equipment 101 is thought this data-bag lost, read the congestion window adjustment information (receive 3 repeat ACK packets as example take sending ending equipment 101, read the dw value of carrying in the 3rd packet) of carrying in the ack msg bag receiving for the last time; If the congestion window adjustment information reading is less than zero, renewal current congestion window is
afterwards, retransmit this packet; If the congestion window adjustment information reading is greater than zero, upgrade current congestion window and be (W+dw) afterwards, retransmit this packet; Wherein, MIN represents to get minimum value operation.
Two, sending ending equipment 101 arrives and does not receive at default time-out time the ack msg bag that packet is corresponding
In this case, the data-bag lost that sending ending equipment 101 sends before thinking, it is after preset value that sending ending equipment 101 upgrades current congestion window, retransmits this packet, wherein, preset value is less than the congestion window before renewal.Because lagging behind overtime duration, ack msg bag arrives, illustrate that ack msg bag has all been lost halfway, this illustrates current Link State very severe, and sending ending equipment can say that congestion window is set to preset value, for example, can singly be not limited to be set to 1 packet and retransmit this packet.
It should be noted that, the sending ending equipment relating in the embodiment of the present invention can be, but not limited to as mobile terminal, receiving device can be, but not limited to as server, and go-between transmission equipment can be, but not limited to as getting involved the web-transporting devices such as control appliance, router device.
The data transfer control method that the embodiment of the present invention provides, can be according to positive and negative effective differentiation congestion packet loss of dw value and packet lost by corruption (Link State is poor to be caused), if dw value is for just, illustrate that go-between transmission equipment also has remaining bandwidth, the possibility of packet lost by corruption is larger, at this moment, needs the packet of retransmission of lost, can increase data package transmission velocity simultaneously, and without reducing data package transmission velocity; If dw value for negative, illustrates that go-between transmission equipment load is larger, it is saturated that its capacity approaches, and the possibility of congestion packet loss is larger, now, needs retransmission data packet may, reduces data package transmission velocity simultaneously.
Based on same inventive concept, corresponding data transfer control method and the data transfer controller of providing also in the embodiment of the present invention, because the principle that said method and device are dealt with problems is similar to data transfer control system, therefore the enforcement of said method and device can be referring to the enforcement of system, repeats part and repeat no more.
As shown in Figure 2, it is the implementing procedure schematic diagram of transmitting terminal side data transfer control method, can comprise the following steps:
S201, send packet by least one go-between transmission equipment to receiving device successively;
Wherein, in this packet, carry current data packet transmission round-trip delay RTT information and the first congestion window adjustment information;
The ack msg bag of the described packet that S202, reception receiving device return, carries the second congestion window adjustment information in this ack msg bag;
Wherein, the second congestion window adjustment information is at least one go-between transmission equipment is after receiving packet, redefines out and send to described receiving device according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and packet;
S203, upgrade current congestion window according to described the second congestion window adjustment information.
Wherein, in step 203, can upgrade in accordance with the following methods current congestion window: upgrading current congestion window is MAX (P, W+dw), wherein: MAX represents to get maxima operation; P is the length of current data to be transmitted bag; W is the congestion window before upgrading; Dw is the second congestion window adjustment information.
When concrete enforcement, said method, can also comprise the following steps:
Step 1, received at least two repeat ACK packets corresponding to described packet before default time-out time arrives time, read the congestion window adjustment information of carrying in the ack msg bag receiving for the last time;
If the congestion window adjustment information that step 2 reads is less than zero, renewal current congestion window is
afterwards, retransmit described packet, wherein, MIN represents to get minimum value operation; If the congestion window adjustment information reading is greater than zero, upgrade current congestion window and be (W+dw) afterwards, retransmit described packet.
When concrete enforcement, said method also can comprise: in the time that default time-out time arrives and do not receive ack msg bag corresponding to described packet, after upgrading current congestion window and be preset value, retransmit described packet, described preset value is less than the congestion window before renewal.
Correspondingly, the embodiment of the present invention provides a kind of distolateral data transfer controller that sends, and as shown in Figure 3, comprising:
Transmitting element 301, for sending packet by least one go-between transmission equipment to receiving device successively, carries current data packet transmission round-trip delay RTT information and the first congestion window adjustment information in described packet;
Receiving element 302, reply ack msg bag for what receive described packet that receiving device returns, in described ack msg bag, carry the second congestion window adjustment information, described the second congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, redefine out and send to described receiving device according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Updating block 303, for upgrading current congestion window according to described the second congestion window adjustment information.
Wherein, updating block 303, can be for upgrading current congestion window: MAX (P, W+dw) according to following formula, wherein: MAX represents to get maxima operation; P is the length of current data to be transmitted bag; W is the congestion window before upgrading; Dw is the second congestion window adjustment information.
Specifically enforcement is, said apparatus can also comprise reading unit, wherein:
Reading unit, for received at least two repeat ACK packets corresponding to described packet before default time-out time arrives time, reads the congestion window adjustment information of carrying in the ack msg bag receiving for the last time;
Updating block 303, if be also less than zero for the congestion window adjustment information reading, renewal current congestion window is
if the congestion window adjustment information reading is greater than zero, upgrading current congestion window is (W+dw);
Transmitting element 301, for upgrading current congestion window at updating block 303 is also
afterwards, or upgrade current congestion window be (W+dw) afterwards, retransmit described packet.
When concrete enforcement, updating block 303, can also be used in the time that default time-out time arrives and do not receive ack msg bag corresponding to described packet, and upgrading current congestion window is preset value, and described preset value is less than the congestion window before renewal; Transmitting element 301, also, for upgrading at updating block 303 after current congestion window is preset value, retransmits described packet.
As shown in Figure 4, it is the schematic flow sheet of go-between transmission equipment implementation data transfer control method, can comprise the following steps:
S401, reception packet, carry current data packet transmission RTT information and congestion window adjustment information in this packet;
S402, redefine according to the RTT information of carrying in the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding;
If when the congestion window adjustment information that S403 redefines out is less than the congestion window adjustment information of carrying in described packet, use the congestion window adjustment information redefining out to replace the congestion window adjustment information of carrying in described packet.
When concrete enforcement, said method can also comprise the following steps:
By described Packet Generation, to receiving device, indication receiving device is carried at the congestion window adjustment information of carrying in described packet in the ack msg bag of described packet and returns to sending ending equipment.
Concrete enforcement is, in step S402, can redefine the congestion window adjustment information that packet is corresponding according to following arbitrary formula: dw=(r-r
i) * RTT or dw=(r-r
i) * RTT-L, wherein, dw is congestion window adjustment information corresponding to described packet of again determining; R is the current available link bandwidth of described go-between transmission equipment; r
ifor the input rate of described go-between transmission equipment current data packet transfer sequence; RTT is current data packet transmission RTT; L is the length of described packet place data packet transmission sequence.
Especially, while comprising at least two packet transfer sequences if current, in step S402, can determine congestion window adjustment information corresponding to packet receiving according to following steps:
Step 1, for each data packet transmission sequence, be defined as according to QoS class information corresponding to this data packet transmission sequence and bandwidth demand information the bandwidth that this data packet transmission sequence is distributed;
Step 2, the bandwidth that is defined as this data packet transmission sequence allocation account for the ratio of current available bandwidth;
Step 3, determine according to following arbitrary formula the congestion window adjustment information that this data packet transmission sequence is corresponding:
Or
Wherein: dw
jbe the j article of congestion window adjustment information that packet transfer sequence is corresponding; R is the current available link bandwidth of described go-between transmission equipment; r
iathe input rate sum of all data packet transmission sequences that comprise for described go-between transmission equipment;
the average of data packet transmission RTT in the each data packet transmission sequence comprising for described go-between transmission equipment; L
jbe the length of j article of packet transfer sequence; t
jfor described go-between transmission equipment is the ratio that bandwidth that j article of packet transfer sequence distributes accounts for current available bandwidth.
Step 4, determine that the congestion window adjustment information corresponding to transfer of data sequence at described packet place is the congestion window adjustment information that described packet is corresponding.
Correspondingly, the embodiment of the present invention provides a kind of go-between transmission equipment side data transmission control unit, as shown in Figure 5, comprising:
Receiving element 501, for receiving packet, carries current data packet transmission round-trip delay RTT information and congestion window adjustment information in described packet;
Determining unit 502, redefines for the RTT information of carrying according to the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding;
Updating block 503, if while being less than for the congestion window adjustment information redefining out the congestion window adjustment information that described packet carries, replaces the congestion window adjustment information of carrying in described packet by the congestion window adjustment information redefining out.
When concrete enforcement, said apparatus, can also comprise:
Transmitting element, for by described Packet Generation to receiving device, indicate described receiving device that the congestion window adjustment information of carrying in described packet is carried to replying in ack msg bag of described packet and return to sending ending equipment.
When concrete enforcement, determining unit 502 can be for redefining the congestion window adjustment information that described packet is corresponding according to following formula: dw=(r-r
i) * RTT; Or redefine according to following formula the congestion window adjustment information that described packet is corresponding: dw=(r-r
i) * RTT-L, wherein: dw is congestion window adjustment information corresponding to described packet of again determining; R is the current available link bandwidth of described go-between transmission equipment; r
ifor the input rate of described go-between transmission equipment current data packet transfer sequence; RTT is current data packet transmission RTT; L is the length of described packet place data packet transmission sequence.
When concrete enforcement, determining unit 502, can comprise:
First determines subelement, if while being used for comprising at least two packet transfer sequences, for each data packet transmission sequence, be defined as according to service quality QoS class information corresponding to this data packet transmission sequence and bandwidth demand information the bandwidth that this data packet transmission sequence is distributed;
Second determines subelement, accounts for the ratio of current available bandwidth for being defined as the bandwidth of this data packet transmission sequence allocation;
The 3rd determines subelement, for also determining according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding:
or determine according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding
wherein dw
jbe the j article of congestion window adjustment information that packet transfer sequence is corresponding; R is the current available link bandwidth of described go-between transmission equipment; r
iathe input rate sum of all data packet transmission sequences that comprise for described go-between transmission equipment;
the average of data packet transmission RTT in the each data packet transmission sequence comprising for described go-between transmission equipment; L
jbe the length of j article of packet transfer sequence; t
jfor described go-between transmission equipment is the ratio that bandwidth that j article of packet transfer sequence distributes accounts for current available bandwidth;
The 4th determines subelement, is the congestion window adjustment information that described packet is corresponding for congestion window adjustment information corresponding to transfer of data sequence of determining described packet place.
As shown in Figure 6, the schematic flow sheet of the receiving device implementation data transfer control method providing for the embodiment of the present invention, comprises the following steps:
The packet that S601, receiving end/sending end equipment send by least one go-between transmission equipment successively;
Wherein, in the packet receiving, carry the current congestion window adjustment information of this packet, this congestion window adjustment information, at least one go-between transmission equipment is after receiving described packet, is determined according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and this packet; Wherein, each intermediate equipment is after receiving this packet, all can redefine congestion window adjustment information according to the RTT information of carrying in the input rate information of self current data packet transmission sequence and available link bandwidth information and this packet, if it is less than the congestion window adjustment information of carrying in this packet, replace the congestion window adjustment information of carrying in this packet by the congestion window adjustment information redefining out.
S602, read the congestion window adjustment information of carrying in this packet;
S603, the congestion window adjustment information reading is carried in the ack msg bag of this packet and returns to sending ending equipment.
As shown in Figure 7, the structural representation of the receiving device side data transmission control unit providing for the embodiment of the present invention, comprising:
Receiving element 701, the packet sending by least one go-between transmission equipment successively for receiving end/sending end equipment;
Wherein, in this packet, carry the current congestion window adjustment information of this packet, this congestion window adjustment information, at least one go-between transmission equipment is after receiving described packet, is determined according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and this packet;
Reading unit 702, for reading this congestion window adjustment information;
Transmitting element 703, the ack msg bag that is carried at this packet for the congestion window adjustment information that reading unit 702 is read returns to sending ending equipment.
The data transmission system that the embodiment of the present invention provides, method and relevant apparatus, sending ending equipment is in the time sending packet, in this packet, carry current RTT information and congestion window adjustment information, after each go-between transmission equipment receives this packet, redefine congestion window adjustment information according to the input rate of self current link bandwidth and data packet transmission sequence, if when the congestion window adjustment information of determining is less than the congestion window adjustment information of carrying in this packet, replace the congestion window adjustment information of carrying in this packet by the congestion window adjustment information redefining out, in the time that packet finally arrives receiving terminal, the congestion window adjustment information of carrying in packet is the minimum congestion window adjustment information of determining on whole transmission path, receiving terminal is carried at the congestion window adjustment information of carrying in packet in reply data bag and returns to sending ending equipment, sending ending equipment upgrades self current congestion window according to the congestion window adjustment information of carrying in reply data bag.In said process, because congestion window adjustment information is determined according to the actual congestion state of go-between transmission equipment, thereby the congested adjustment window information of determining can reflect physical link situation, like this, can make full use of data transfer bandwidth resource, avoid the waste of Internet resources, make Data Transmission Controlling more reasonable, simultaneously, the packet that go-between transmission equipment sends without buffer memory sending ending equipment, avoid its bottleneck that becomes Internet Transmission, guaranteed the reliability of wireless network data transmission.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware implementation example, completely implement software example or the form in conjunction with the embodiment of software and hardware aspect.And the present invention can adopt the form at one or more upper computer programs of implementing of computer-usable storage medium (including but not limited to magnetic disc store, CD-ROM, optical memory etc.) that wherein include computer usable program code.
The present invention is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present invention, equipment (system) and computer program.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction that makes to carry out by the processor of computer or other programmable data processing device produces the device for realizing the function of specifying at flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of specifying in flow process of flow chart or multiple flow process and/or square frame of block diagram or multiple square frame on computer or other programmable devices.
Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to be interpreted as comprising preferred embodiment and fall into all changes and the modification of the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (24)
1. a data transfer control system, comprises sending ending equipment, receiving device and at least one go-between transmission equipment, it is characterized in that,
Described sending ending equipment, for sending packet by described at least one go-between transmission equipment to described receiving device successively, carries current data packet transmission round-trip delay RTT information and congestion window adjustment information in described packet; And receive that described receiving device returns reply ack msg bag after, upgrade current congestion window according to the congestion window adjustment information of carrying in described ack msg bag;
Each go-between transmission equipment, for after receiving described packet, redefine according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding; If when the congestion window adjustment information redefining out is less than the congestion window adjustment information of carrying in described packet, use the congestion window adjustment information redefining out to replace the congestion window adjustment information of carrying in described packet;
Described receiving device, for after receiving described packet, reads the congestion window adjustment information of carrying in described packet; And the congestion window adjustment information reading is write in the ack msg bag of described packet and return to described sending ending equipment.
2. the system as claimed in claim 1, is characterized in that,
Each go-between transmission equipment, specifically for redefining the congestion window adjustment information that described packet is corresponding: dw=(r-r according to following formula
i) * RTT; Or specifically for redefine the congestion window adjustment information that described packet is corresponding according to following formula: dw=(r-r
i) * RTT-L, wherein:
Dw is congestion window adjustment information corresponding to described packet of again determining;
R is the current available link bandwidth of described go-between transmission equipment;
R
ifor the input rate of described go-between transmission equipment current data packet transfer sequence;
RTT is current data packet transmission RTT;
L is the length of described packet place data packet transmission sequence.
3. the system as claimed in claim 1, is characterized in that,
Each go-between transmission equipment, if when self comprising at least two packet transfer sequences, determine in accordance with the following methods congestion window adjustment information corresponding to described packet:
For each data packet transmission sequence, be defined as according to service quality QoS class information corresponding to this data packet transmission sequence and bandwidth demand information the bandwidth that this data packet transmission sequence is distributed; The bandwidth that is defined as this data packet transmission sequence allocation accounts for the ratio of current available bandwidth; And determine according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding:
or determine according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding
congestion window adjustment information corresponding to transfer of data sequence of determining described packet place is the congestion window adjustment information that described packet is corresponding, wherein:
Dw
jbe the j article of congestion window adjustment information that packet transfer sequence is corresponding;
R is the current available link bandwidth of described go-between transmission equipment;
R
iathe input rate sum of all data packet transmission sequences that comprise for described go-between transmission equipment;
L
jbe the length of j article of packet transfer sequence;
T
jfor described go-between transmission equipment is the ratio that bandwidth that j article of packet transfer sequence distributes accounts for current available bandwidth.
4. system as claimed in claim 2, is characterized in that,
Described sending ending equipment, is MAX (P, W+dw) specifically for upgrading current congestion window, and wherein, MAX represents to get maxima operation, and P is the length of current data to be transmitted bag, and W is the congestion window before upgrading.
5. system as claimed in claim 4, is characterized in that,
Described sending ending equipment, also for received at least two repeat ACK packets corresponding to described packet before default time-out time arrives time, reads the congestion window adjustment information of carrying in the ack msg bag receiving for the last time; If the congestion window adjustment information reading is less than zero, renewal current congestion window is
afterwards, retransmit described packet; If the congestion window adjustment information reading is greater than zero, upgrade current congestion window and be (W+dw) afterwards, retransmit described packet; Wherein, MIN represents to get minimum value operation.
6. system as claimed in claim 4, is characterized in that,
Described sending ending equipment, also when arrive and do not receive ack msg bag corresponding to described packet at default time-out time, after upgrading current congestion window and be preset value, retransmits described packet, and described preset value is less than the congestion window before renewal.
7. a data transfer control method, is characterized in that, comprising:
Send packet by least one go-between transmission equipment to receiving device successively, in described packet, carry current data packet transmission round-trip delay RTT information and the first congestion window adjustment information;
What receive the described packet that returns of receiving device replys ack msg bag, in described ack msg bag, carry the second congestion window adjustment information, described the second congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, redefine out and send to described receiving device according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Upgrade current congestion window according to described the second congestion window adjustment information.
8. method as claimed in claim 7, is characterized in that, upgrades current congestion window according to described the second congestion window adjustment information, specifically comprises:
Upgrading current congestion window is MAX (P, W+dw), wherein:
MAX represents to get maxima operation;
P is the length of current data to be transmitted bag;
W is the congestion window before upgrading;
Dw is the second congestion window adjustment information.
9. method as claimed in claim 8, is characterized in that, also comprises:
Received at least two repeat ACK packets corresponding to described packet before default time-out time arrives time, read the congestion window adjustment information of carrying in the ack msg bag receiving for the last time;
If the congestion window adjustment information reading is less than zero, renewal current congestion window is
afterwards, retransmit described packet, wherein, MIN represents to get minimum value operation;
If the congestion window adjustment information reading is greater than zero, upgrade current congestion window and be (W+dw) afterwards, retransmit described packet.
10. method as claimed in claim 8, is characterized in that, also comprises:
In the time that default time-out time arrives and does not receive ack msg bag corresponding to described packet, after upgrading current congestion window and be preset value, retransmit described packet, described preset value is less than the congestion window before renewal.
11. 1 kinds of data transfer controllers, is characterized in that, comprising:
Transmitting element, for sending packet by least one go-between transmission equipment to receiving device successively, carries current data packet transmission round-trip delay RTT information and the first congestion window adjustment information in described packet;
Receiving element, reply ack msg bag for what receive described packet that receiving device returns, in described ack msg bag, carry the second congestion window adjustment information, described the second congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, redefine out and send to described receiving device according to the RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Updating block, for upgrading current congestion window according to described the second congestion window adjustment information.
12. devices as claimed in claim 11, is characterized in that,
Described updating block, specifically for upgrading current congestion window: MAX (P, W+dw) according to following formula, wherein: MAX represents to get maxima operation; P is the length of current data to be transmitted bag; W is the congestion window before upgrading; Dw is the second congestion window adjustment information.
13. devices as claimed in claim 12, is characterized in that, also comprise reading unit, wherein:
Described reading unit, for received at least two repeat ACK packets corresponding to described packet before default time-out time arrives time, reads the congestion window adjustment information of carrying in the ack msg bag receiving for the last time;
Described updating block, if be also less than zero for the congestion window adjustment information reading, renewal current congestion window is
if the congestion window adjustment information reading is greater than zero, upgrading current congestion window is (W+dw);
Described transmitting element, for upgrading current congestion window at described updating block is also
afterwards, or upgrade current congestion window be (W+dw) afterwards, retransmit described packet.
14. devices as claimed in claim 12, is characterized in that,
Described updating block, also when arrive and do not receive ack msg bag corresponding to described packet at default time-out time, upgrading current congestion window is preset value, described preset value is less than the congestion window before renewal;
Described transmitting element, also, for after described updating block renewal current congestion window is preset value, retransmits described packet.
15. 1 kinds of data transfer control methods, is characterized in that, comprising:
Receive packet, in described packet, carry current data packet transmission round-trip delay RTT information and congestion window adjustment information;
Redefine according to the RTT information of carrying in the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding;
If when the congestion window adjustment information redefining out is less than the congestion window adjustment information of carrying in described packet, use the congestion window adjustment information redefining out to replace the congestion window adjustment information of carrying in described packet.
16. require the method as described in 15 as claim, it is characterized in that, also comprise:
Described Packet Generation, to receiving device, is indicated described receiving device that the congestion window adjustment information of carrying in described packet is carried to replying in ack msg bag of described packet and returned to sending ending equipment.
17. methods as described in claim 15 or 16, it is characterized in that, redefine according to the RTT information of carrying in the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding, specifically comprise:
Redefine according to following formula the congestion window adjustment information that described packet is corresponding: dw=(r-r
i) * RTT; Or
Redefine according to following formula the congestion window adjustment information that described packet is corresponding: dw=(r-r
i) * RTT-L, wherein:
Dw is congestion window adjustment information corresponding to described packet of again determining;
R is the current available link bandwidth of described go-between transmission equipment;
R
ifor the input rate of described go-between transmission equipment current data packet transfer sequence;
RTT is current data packet transmission RTT;
L is the length of described packet place data packet transmission sequence.
18. methods as claimed in claim 15, it is characterized in that, if while comprising at least two packet transfer sequences, redefine according to the RTT information of carrying in the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding, specifically comprise:
For each data packet transmission sequence, be defined as according to service quality QoS class information corresponding to this data packet transmission sequence and bandwidth demand information the bandwidth that this data packet transmission sequence is distributed;
The bandwidth that is defined as this data packet transmission sequence allocation accounts for the ratio of current available bandwidth;
And determine according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding:
or determine according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding
Congestion window adjustment information corresponding to transfer of data sequence of determining described packet place is the congestion window adjustment information that described packet is corresponding;
Wherein:
Dw
jbe the j article of congestion window adjustment information that packet transfer sequence is corresponding;
R is the current available link bandwidth of described go-between transmission equipment;
R
iathe input rate sum of all data packet transmission sequences that comprise for described go-between transmission equipment;
L
jbe the length of j article of packet transfer sequence;
T
jfor described go-between transmission equipment is the ratio that bandwidth that j article of packet transfer sequence distributes accounts for current available bandwidth.
19. 1 kinds of data transfer controllers, is characterized in that, comprising:
Receiving element, for receiving packet, carries current data packet transmission round-trip delay RTT information and congestion window adjustment information in described packet;
Determining unit, redefines for the RTT information of carrying according to the input rate information of current data packet transfer sequence and available link bandwidth information and described packet the congestion window adjustment information that described packet is corresponding;
Updating block, if while being less than for the congestion window adjustment information redefining out the congestion window adjustment information that described packet carries, replaces the congestion window adjustment information of carrying in described packet by the congestion window adjustment information redefining out.
20. devices as claimed in claim 19, is characterized in that, also comprise:
Transmitting element, for by described Packet Generation to receiving device, indicate described receiving device that the congestion window adjustment information of carrying in described packet is carried to replying in ack msg bag of described packet and return to sending ending equipment.
21. devices as described in claim 19 or 20, is characterized in that,
Described determining unit, specifically for redefining the congestion window adjustment information that described packet is corresponding: dw=(r-r according to following formula
i) * RTT; Or redefine according to following formula the congestion window adjustment information that described packet is corresponding: dw=(r-r
i) * RTT-L, wherein: dw is congestion window adjustment information corresponding to described packet of again determining; R is the current available link bandwidth of described go-between transmission equipment; r
ifor the input rate of described go-between transmission equipment current data packet transfer sequence; RTT is current data packet transmission RTT; L is the length of described packet place data packet transmission sequence.
22. devices as claimed in claim 19, is characterized in that, described determining unit, comprising:
First determines subelement, if while being used for comprising at least two packet transfer sequences, for each data packet transmission sequence, be defined as according to service quality QoS class information corresponding to this data packet transmission sequence and bandwidth demand information the bandwidth that this data packet transmission sequence is distributed;
Second determines subelement, accounts for the ratio of current available bandwidth for being defined as the bandwidth of this data packet transmission sequence allocation;
The 3rd determines subelement, for also determining according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding:
or determine according to following formula the congestion window adjustment information that this data packet transmission sequence is corresponding
wherein dw
jbe the j article of congestion window adjustment information that packet transfer sequence is corresponding; R is the current available link bandwidth of described go-between transmission equipment; r
iathe input rate sum of all data packet transmission sequences that comprise for described go-between transmission equipment;
the average of data packet transmission RTT in the each data packet transmission sequence comprising for described go-between transmission equipment; L
jbe the length of j article of packet transfer sequence; t
jfor described go-between transmission equipment is the ratio that bandwidth that j article of packet transfer sequence distributes accounts for current available bandwidth;
The 4th determines subelement, is the congestion window adjustment information that described packet is corresponding for congestion window adjustment information corresponding to transfer of data sequence of determining described packet place.
23. 1 kinds of data transfer control methods, is characterized in that, comprising:
The packet that receiving end/sending end equipment sends by least one go-between transmission equipment successively, in described packet, carry the current congestion window adjustment information of described packet, described congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, determine according to the transmission round-trip delay RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Read described congestion window adjustment information;
The congestion window adjustment information reading is carried to replying of described packet and in ack msg bag, returns to described sending ending equipment.
24. 1 kinds of data transfer controllers, is characterized in that, comprising:
Receiving element, the packet sending by least one go-between transmission equipment successively for receiving end/sending end equipment, in described packet, carry the current congestion window adjustment information of described packet, described congestion window adjustment information be described at least one go-between transmission equipment after receiving described packet, determine according to the transmission round-trip delay RTT information of carrying in the input rate information of self current data packet transfer sequence and available link bandwidth information and described packet;
Reading unit, for reading described congestion window adjustment information;
Transmitting element, the ack msg bag of replying that is carried at described packet for the congestion window adjustment information that described reading unit is read returns to described sending ending equipment.
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