CN101646204B - Data transmission method and wireless access network element - Google Patents
Data transmission method and wireless access network element Download PDFInfo
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- CN101646204B CN101646204B CN2009101947370A CN200910194737A CN101646204B CN 101646204 B CN101646204 B CN 101646204B CN 2009101947370 A CN2009101947370 A CN 2009101947370A CN 200910194737 A CN200910194737 A CN 200910194737A CN 101646204 B CN101646204 B CN 101646204B
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Abstract
The embodiment of the invention provides a method for data transmission. When cross-domain switchover happens, a transportation control protocol (TCP) performance-reinforcing module corresponding to a TCP connection of the receiving end where cross-domain switchover takes place is established in a target domain according to the information connected by TCP at the receiving end where cross-domain switchover happens, so as to be used for data transmission, wherein the information connected by TCP comprises a source port, a destination port, a source address and a destination address. When cross RNC or eNB switchover happens to UE in the embodiment of the invention, option information of both sending and receiving part at the primary stage of TCP connection before RNC or eNB switchover happens can be obtained by reestablishing the TCP performance-reinforcing module, thereby continuously optimizing the performance of TCP data transportation, in particular applying to wireless network system where small area switchover happens frequently.
Description
Technical field
The present invention relates to communication technical field, be specifically related to data transmission method and wireless access network element.
Background technology
In cable network, losing and retransmitting mainly due to network congestion of transmission control protocol (TCP, Transmission Control Protocol) packet causes.Compare with cable network, the transmission environment of wireless network is abominable relatively, and its channel quality usually shows as instantaneous variation, for example, causes the unexpected variation of quality of wireless channel for a certain reason, recovers normal then at short notice again.Packet loss and re-transmission that the unexpected variation of quality of wireless channel like that is caused, it is congested often to make that TCP thinks that network has taken place by mistake, thereby starts congestion control mechanism (for example, enter start slowly or the window operation etc. that reduces by half).In case channel quality improves suddenly, the congestion control mechanism that has started causes transmission speed not catch up with again, and then causes the free of data of eating dishes without rice or wine to send, the adverse consequences that throughput of system descends.
The problem that when using TCP, occurs at wireless network, prior art at certain network element of wireless access network (for example adopts, radio network controller (RNC, Radio Network Controller) or evolution base station (eNB, e-UTRAN NodeB)) increase a TCP performance in and strengthen module (TPE, TCPPerformance Enhancer), as shown in Figure 1, in the hope of addressing the above problem by TPE.
Because being three step handshake phase when setting up the TCP connection, the information that TPE write down just carries, in case subscriber equipment (UE, User Equipment) there is cross-domain switching behavior to take place, promptly, UE is from a radio network controller (RNC, Radio Network Controller) zone of being controlled or evolution base station (eNB, evolution NodeB) zone that is covered (territory, source) strides the zone or the eNB that control to another RNC, during the zone that is covered (aiming field), generally speaking, new zone (aiming field) no longer exists current receiving terminal to be connected the TPE performance enhancing module of holding when setting up with transmitting terminal at TCP, therefore can't carry out performance optimization to the transmission of tcp data again and handle.
Summary of the invention
The embodiment of the invention provides a kind of data transmission method, wireless access network element and TCP performance intensifier and method, can improve cross-domain data transmission performance.
The data transmission method that the embodiment of the invention provides comprises:
When cross-domain switching takes place when, the information that connects according to the transmission control protocol TCP of the receiving terminal of the cross-domain switching of described generation, in aiming field, create with the TCP of the receiving terminal that cross-domain switching takes place and connect corresponding TCP performance enhancing module, to be used for transfer of data, wherein, the information of described TCP connection comprises source port, destination interface, source address and destination address.
The wireless access network element that the embodiment of the invention provides comprises:
Acquisition module is used to obtain the information that the transmission control protocol TCP of the receiving terminal of the cross-domain switching of described generation connects, and wherein, described TCP link information comprises source port, destination interface, source address and destination address at least;
Creation module, the information that the TCP that is used for obtaining according to described acquisition module connects are created the TCP performance at aiming field and are strengthened module, to be used for transfer of data.
The TCP performance intensifier that the embodiment of the invention provides comprises:
Judging unit, be used to judge whether that needs increase the speed that transmitting terminal sends data, wherein, described judging unit judges whether that according to the relation of the congestion window capacity of described transmission control protocol TCP performance intensifier and described TCP performance intensifier buffer memory capacity needs increase the speed that transmitting terminal sends data, when at the congestion window capacity of the described TCP performance intensifier k less than described TCP performance intensifier buffer memory capacity
1Times the time, described judgment unit judges need increase the speed that transmitting terminal sends data, perhaps, described judging unit judges whether that according to the time difference that described TCP performance strengthens module repetitive data packet that receives and the packet that received last time needs increase the speed of transmitting terminal transmission data, when described time difference during greater than preset threshold, described judgment unit judges need increase the transmission speed of described transmitting terminal;
Copied cells is used for when described judgment unit judges need increase transmitting terminal and sends the speed of data, duplicates that the affirmation message that is received is sent to transmitting terminal so that transmitting terminal increases the transmission speed of data;
Wherein, described k
1Size is between 0 and 1.
The TCP performance Enhancement Method that the embodiment of the invention provides comprises:
Strengthen the k of the congestion window capacity of module in the TCP performance less than described TCP performance enhancement mode block cache capacity
1Times the time, duplicate that the affirmation message that is received is sent to transmitting terminal so that transmitting terminal increases the transmission speed of data; Perhaps,
When described TCP performance strengthen module receive a repetitive data packet and receive this repetitive data packet with the time difference of the packet that received last time greater than preset threshold, the affirmation message that then duplicates described receiving terminal is sent to transmitting terminal so that the transmission speed of transmitting terminal increase data;
Wherein, described k
1Size is between 0 and 1.
In the embodiment of the invention, according to the information that the transmission control protocol TCP of the receiving terminal that cross-domain switching takes place connects, in aiming field, create with the TCP of the receiving terminal that cross-domain switching takes place and connect corresponding TCP performance enhancing module, to be used for transfer of data.When the UE in the embodiment of the invention strides RNC or eNB switching, can strengthen module by rebuliding the TCP performance, know the option information of striding RNC or the preceding TCP connection of eNB switching initial stage receiving-transmitting sides, thereby continue to optimize the tcp data transmission performance, be particularly suitable for the sub-district and switch frequent Radio Network System.
Description of drawings
Fig. 1 is that prior art TCP performance strengthens module present position schematic diagram in network;
Fig. 2 is the data transmission method basic procedure schematic diagram of the embodiment of the invention two;
Fig. 3 is the wireless access network element basic logical structure schematic diagram of the embodiment of the invention three;
Fig. 4 is the TCP performance intensifier basic logical structure schematic diagram of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the invention one provides a kind of data transmission method, mainly comprise: when cross-domain switching takes place, the information that connects according to the transmission control protocol TCP of the receiving terminal of the cross-domain switching of described generation, in aiming field, create with the TCP of the receiving terminal that cross-domain switching takes place and connect corresponding TCP performance enhancing module, to be used for transfer of data, wherein, the information of described TCP connection comprises source port, destination interface, source address and destination address.
Need to prove, the information that TCP in the embodiment of the invention connects can be obtained in several ways, for example: the message that the wireless access network element in reception sources territory sends, the message that sends according to the wireless access network element in territory, described source is obtained the link information of described TCP; Perhaps, receive the tcp data bag, obtain the link information of TCP according to the packet of described reception.The embodiment of the invention is not done qualification to this, connect required information as long as can obtain to create TCP.
Further, in the embodiment of the invention, before creating TCP performance enhancing module, can also judge in this aiming field, whether to exist to be connected corresponding TCP performance enhancing module,, can not create if exist with this TCP, if there is no, carry out the step of creating again.Therefore, the embodiment of the invention can strengthen module by rebuliding the TCP performance, knows the option information of striding RNC or the preceding TCP connection of eNB switching initial stage receiving-transmitting sides, thereby continues to optimize the tcp data transmission performance.
After creating the TCP performance and strengthening module, in data transmission procedure, the actual reception window that can also obtain receiving terminal according to the announcement window numerical value and the ACK sequence number of receiving terminal, thus send the suitable packet of actual capacity with the receiving terminal receiver window in view of the above.
The embodiment of the invention two provides another kind of data transmission method, in the embodiment of the invention, is UE with the receiving terminal, and transmitting terminal is that server describes, and is used alternatingly sometimes when style of writing, does not add differentiation.See also Fig. 2, this method can comprise:
Step S201 receives the tcp data bag, obtains the link information of TCP according to the packet of described reception.
When cross-domain switching takes place in user equipment (UE), the wireless access network element of aiming field (for example, RNC or eNodeB etc.) receive the tcp data bag, carry the information that this UE is connected with the TCP of server in this packet, therefore can obtain the link information of TCP according to this packet.This link information can comprise: source port, destination interface, source address and destination address, in addition, can also comprise: (Selection ACKnowledgement is confirmed in initial sequence number, UE receiver window, the scalable factor of window, selection, SACK) and the maximum segment size (Max Segment Size, MSS) or the like
As mentioned above, except obtain the link information of TCP according to the tcp data bag that receives, the message that can also send according to the wireless access network element (for example source base station) in territory, source, parse the information that TCP connects, that is to say, can after cross-domain switching take place, the wireless access network element by the territory, source sends and comprises that the message of TCP link information is to aiming field.
Step S202 judges according to the link information of the TCP that obtains whether aiming field exists the TCP performance corresponding with the TCP connection of the UE that cross-domain switching takes place to strengthen module.
Generally speaking, when cross-domain switching takes place in UE, aiming field can not exist with the TCP of the receiving terminal that cross-domain switching takes place and connect corresponding TCP performance enhancing module TPE, but under exception, for example, cross-domain switching takes place in UE, gets back to the territory, source again through after the of short duration cross-domain switching, at this moment, the TPE in this territory that switches to also exists.In order not repeat to create TPE, can judge earlier whether the aiming field that switches to exists the TCP performance corresponding with the TCP connection of the receiving terminal that cross-domain switching takes place to strengthen module.In the present embodiment, the link information of the TCP that can carry according to the tcp data bag of reception, the source port that for example wherein comprises, destination interface, source address and destination address etc. judge whether aiming field exists the TCP performance corresponding with the TCP connection of the receiving terminal that cross-domain switching takes place to strengthen module.If aiming field does not exist above-mentioned TCP performance to strengthen module TPE, then carry out S203.
Step S203 creates the TCP performance and strengthens module TPE.
In this step, according to the information creating TPE of the TCP connection of obtaining among the S201.After creating TCP performance enhancing module TPE, the congestion window of this TPE can be initialized as 0.
Further, in data transmission procedure, the TCP performance corresponding with the TCP connection of the receiving terminal cross-domain switching of described generation that create at aiming field strengthens module TPE, can be according to the affirmation message ACK of described receiving terminal feedback, obtain the announcement window (AW of described receiving terminal, Advertised Window) numerical value and ACK sequence number, thus the actual size of receiver window of the receiving terminal of the cross-domain switching of described generation further obtained according to described announcement window numerical value and described ACK sequence number.Specific as follows:
Step S204 obtains the maximum sequence number in the packet of reception, calculates the data length sum max_seq that the maximum sequence number in the packet that receives is carried with it.
Step S205 calculates max_seq and TCP performance and strengthens the difference that module sends the sequence number of wait acknowledge in the buffer memory.
In order to narrate conveniently, this difference is designated as res_ult herein, the sequence number that the TCP performance is strengthened wait acknowledge in the module transmission buffer memory is designated as snd_una.
In addition, affirmation message (ACK) sequence number of the UE that can receive by more previous snd_una and this TPE upgrades the value of snd_una, and the higher value of getting both is new snd_una.
If calculate if res_ult greater than rwnd * 2
Ws, carry out S206, wherein, variable WS is the scalable factor of the window of receiving terminal UE, the pass of variable snd_wnd and variable WS is snd_wnd=rwnd * 2
Ws, variable rwnd is a UE announcement window size, for example, is 65535 if UE announces the window size, then snd_wnd=65535 * 2
Ws
Step S206 then increases by 1 with variable WS.
If res_ult is greater than rwnd * 2
Ws, then variable WS is increased by 1, and with new variable WS new variables snd_wnd more.After the value of WS is upgraded, the value and a predefined value of this renewal can be compared, if also do not reach the value of this setting, then S204 to 206 is carried out in circulation, if reach the value of this setting, be the actual size of the current receiver window capacity of UE then with the pairing snd_wnd conduct of WS this moment.
Generally speaking, initial value that can ws is set to 0, stops cycle calculations when ws increases to a set point (for example, 1 or 2).
Hence one can see that, because the UE receiver window amount of capacity field of carrying in the packet that server is accepted has been indicated the actual size of the receiver window capacity of UE, therefore, server can send suitable with it data volume according to the receiver window actual capacity of UE, thereby has avoided the buffer memory of UE to overflow.
Packet loss that the unexpected variation of quality of wireless channel caused and re-transmission make TCP think that network has taken place congested and started congestion control mechanism (for example, enter start slowly or the window operation etc. that reduces by half) is disadvantageous for the relatively low wireless network of speed by mistake.And the TCP performance strengthens the ack msg message that module TPE can duplicate some parts of receiving terminals and is sent to transmitting terminal, quickens to enlarge the congestion window (CWnd, Congestion Window) of receiving terminal with this.
For traffic volume and the throughput of system that strengthens the data of eating dishes without rice or wine, in embodiment provided by the invention, when confirming to need to increase the transmission speed of described transmitting terminal, the affirmation message that duplicates described receiving terminal is sent to transmitting terminal.For example, when described TCP performance strengthen module receive a repetitive data packet and receive this repetitive data packet with the time difference of the packet of reception last time greater than preset threshold, then confirm to need to increase the transmission speed of described transmitting terminal, the affirmation message that duplicates described receiving terminal is sent to transmitting terminal.
Need to prove that the congestion window amount of capacity that prior art TCP performance enhancing module TPE is safeguarded inside and the congestion window amount of capacity of server are suitable, that is, it is synchronous that both amount of capacity need keep.Owing to keep synchronous mechanism complexity or (for example keep the more workload of the extra increase of synchronous needs, when the version of server changes, the congestion window capacity of TPE must be done corresponding change), when both can not keep synchronous, then make a mistake easily, cause the information transmitted between server and the UE wrong.
Therefore, in embodiments of the present invention, the constant of size between 0 and 1 can be set control the congestion window amount of capacity that the TCP performance strengthens module TPE, needn't be consistent with the congestion window of server.So, can wait until that the congestion window of just using TPE when the congestion window size of the congestion window amount of capacity of TPE and server is consistent enlarges the transmission speed of server, keep TCP performance in the embodiment of the invention to strengthen the flexibility of module TPE.For example, strengthen the k of the buffer memory capacity of module less than the TCP performance of described correspondence when the congestion window capacity of described TCP performance enhancing module TPE
1(k doubly
1Size between 0 and 1) time, the TCP performance strengthens the affirmation message ACK that module TPE whenever receives a UE, then confirms to need to increase the transmission speed of described transmitting terminals (server), the affirmation message ACK that duplicates UE is sent to transmitting terminal.Perhaps, strengthen the k of the buffer memory capacity of module more than or equal to described TCP performance at described congestion window capacity
2(k doubly
2Size between 0 and 1) time, stop to enlarge the congestion window capacity.
Situation for the core net packet loss, TCP performance enhancing module can be duplicated some parts of (for example 3 parts) duplicate acknowledgment packets (dupack) and is sent to server with quick request retransmission, enable the function of above-mentioned acceleration transmitting terminal data transmission speed or traffic volume simultaneously, till the packet of receiving the dupack correspondence.
Need explanation, the method for above-mentioned acceleration transmitting terminal data transmission speed also can be used for not taking place to stride the situation of wireless access network element.That is to say that another embodiment of the present invention also provides a kind of TCP performance Enhancement Method, comprising:
Strengthen the k of the congestion window capacity of module in the TCP performance less than TCP performance enhancement mode block cache capacity
1Times the time, duplicate that the affirmation message that is received is sent to transmitting terminal so that transmitting terminal increases the transmission speed of data, herein, k
1Size is between 0 and 1; Perhaps
When the TCP performance strengthen module receive a repetitive data packet and receive this repetitive data packet with the time difference of the packet that received last time greater than preset threshold, the affirmation message that then duplicates receiving terminal is sent to transmitting terminal so that the transmission speed of transmitting terminal increase data.
Further, at the k of congestion window capacity more than or equal to described TCP performance intensifier buffer memory capacity
2Times the time, stop to enlarge the congestion window capacity, wherein, described k
2Size is between 0 and 1.
Need to prove, in the invention described above embodiment, though be that the example that is transmitted as with downlink data illustrates technical solution of the present invention, and receiving terminal and UE, transmitting terminal and server are used alternatingly respectively in the transmission course of downlink data, but those of ordinary skills should be understood that, the technical scheme that the embodiment of the invention provides is equally applicable to transmission of uplink data (receiving terminal can be a server in the transmission of uplink data process, and transmitting terminal can be UE).Therefore, even under the bright situation of saying nothing, those of ordinary skills should be able to know clearly the equipment that is referred in receiving terminal in the present patent application and the transmitting terminal practical application.
See also Fig. 3, the embodiment of the invention three provides a kind of wireless access network element basic structure schematic diagram.For convenience of explanation, only show the part relevant with the embodiment of the invention.Wireless access network element shown in the embodiment can but to be not limited to be radio network controller (RNC), base station BS or evolution base station e NodeB etc., it acquisition module that comprises 31 and creation module 32 can be hardware cell, software unit or software and hardware combining unit, wherein:
In addition, this wireless access network element further comprises judge module 33, receiver window acquisition module 34, accelerating module 35 and/or control module 36, wherein:
Judge at aiming field when judge module 33 and not exist the TCP performance to strengthen module, then the information that connects of the TCP that obtains according to acquisition module 31 of creation module 32 is created the TCP performance enhancing module corresponding with the TCP connection of the receiving terminal that cross-domain switching takes place in aiming field.In embodiments of the present invention, the link information of judge module 33 TCP that can carry according to the tcp data bag that receives judges whether aiming field exists the TCP of the receiving terminal that cross-domain switching takes place to connect the TCP performance enhancing module of correspondence; Perhaps, judge module 33 judges according to the information that the TCP performance of territory, the source receiving terminal that is sent by territory, source wireless access network element when the TCP connection is set up strengthens the TCP connection that module comprised whether described aiming field exists the TCP of the receiving terminal that cross-domain switching takes place to connect corresponding TCP performance enhancing module.
Receiver window acquisition module 34 is used for the actual size of the receiver window of the receiving terminal that announcement window numerical value and ACK sequence number according to described receiving terminal obtain the cross-domain switching of described generation; Wherein, can obtain the announcement window numerical value and the ACK sequence number of described receiving terminal according to the affirmation message ACK of receiving terminal feedback.
Receiver window acquisition module 34 comprises:
Maximum sequence number acquiring unit 341 is used for obtaining the maximum sequence number of the packet of reception, calculates the data length sum max_seq that the maximum sequence number in the packet of described reception is carried with it;
Difference computational unit 342 is used for calculating the difference res_ult of sequence number snd_una that max_seq and described TCP performance strengthen the transmission buffer memory wait acknowledge of module;
Intermediate variable increases progressively unit 343, is used for calculating the res_ult of gained greater than rwnd * 2 in difference computational unit 342
WsThe time, variable ws is increased by 1, and with new variable ws new variables more, wherein, ws is the scalable factor of the window of described receiving terminal, snd_wnd=rwnd * 2
Ws, rwnd is the announcement window numerical value of described receiving terminal;
Updating block 344, be used for upgrading the sequence number snd_una that described TCP performance strengthens the transmission buffer memory wait acknowledge of module, and circulation step A, B and C, scalable factor ws increases to a set point until the window of described receiving terminal, and this variations per hour snd_wnd income value is the actual size of current receiver window in the described receiving terminal.
Accelerating module 35 is used for strengthening the k of the congestion window capacity of module less than TCP performance enhancement mode block cache capacity in the TCP performance
1Times the time, the affirmation message that duplicates reception is sent to transmitting terminal so that transmitting terminal increases the transmission speed of data, wherein, described k
1Size is between 0 and 1, perhaps, when described TCP performance strengthened module and receives a repetitive data packet and receive this repetitive data packet with the time difference of the packet of reception last time greater than preset threshold, the affirmation message that duplicates described receiving terminal was sent to transmitting terminal.In addition, can also comprise in the wireless access network element of the embodiment of the invention: control module 36, be used to adjust the congestion window capacity that the TCP performance strengthens module, strengthen the k of the buffer memory capacity of module more than or equal to the TCP performance of correspondence at the congestion window capacity
2Times the time, stop to enlarge the congestion window capacity, wherein, described k
2Be the decimal between 0 and 1.
The associated description of the executive mode of each the module/unit in the wireless access network element in the foregoing description in can reference method embodiment.
By such scheme as can be known, be sent to transmitting terminal, can make transmitting terminal strengthen the traffic volume of data or increase the transmission speed of data, improve wireless access network the eat dishes without rice or wine traffic volume and the throughput of system of data by duplicating the ack msg bag.
The embodiment of the invention also provides a kind of TCP performance intensifier, and its basic block diagram as shown in Figure 4.The performance of TCP shown in present embodiment intensifier can be a hardware cell, software unit or the software and hardware combining unit that is applied to wireless access network element shown in Figure 3, and it comprises:
Judging unit 401, be used to judge whether that needs increase the speed that transmitting terminal sends data, wherein, described judging unit judges whether that according to the relation of the congestion window capacity of described transmission control protocol TCP performance intensifier and described TCP performance intensifier buffer memory capacity needs increase the speed that transmitting terminal sends data, when at the congestion window capacity of the described TCP performance intensifier k less than described TCP performance intensifier buffer memory capacity
1Times the time, described judgment unit judges need increase the speed that transmitting terminal sends data; Perhaps, described judging unit judges whether that according to the time difference that described TCP performance strengthens module repetitive data packet that receives and the packet that received last time needs increase the speed of transmitting terminal transmission data, when described time difference during greater than preset threshold, described judgment unit judges need increase the transmission speed of described transmitting terminal;
Copied cells 402 is used for when judging unit 401 judges that needs increase the speed of transmitting terminal transmission data, duplicates the affirmation message that is received and is sent to transmitting terminal to be the transmission speed that transmitting terminal increases data;
Wherein, described k
1Be the decimal between 0 and 1.
In addition, this TCP performance intensifier further comprises:
Congestion window control unit 403 is used to control the congestion window capacity of described TCP performance intensifier, at the k of described congestion window capacity more than or equal to described TCP performance intensifier buffer memory capacity
2Times the time, stop to enlarge the congestion window capacity, wherein, described k
2Size is between 0 and 1.
By such scheme as can be known, be sent to transmitting terminal, can make transmitting terminal strengthen the traffic volume of data or increase the transmission speed of data, improve wireless access network the eat dishes without rice or wine traffic volume and the throughput of system of data by duplicating the ack msg bag.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of the foregoing description is to instruct relevant hardware to finish by program, this program can be stored in the computer-readable recording medium, storage medium can comprise: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), disk or CD etc.
In several embodiment that the application provided, should be understood that, disclosed system, apparatus and method not surpassing in the application's the spirit and scope, can realize in other way.Current embodiment is a kind of exemplary example, should be as restriction, and given particular content should in no way limit the application's purpose.For example, a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.
In addition, institute's descriptive system, the schematic diagram of apparatus and method and different embodiment, in the scope that does not exceed the application, can with other system, module, technology or method in conjunction with or integrated.Another point, the shown or coupling each other discussed or directly to be coupled or to communicate to connect can be by some interfaces, the indirect coupling of device or unit or communicate to connect can be electrically, machinery or other form.
More than data transmission method that the embodiment of the invention provided, wireless access network element and relevant TCP performance intensifier and method are described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (15)
1. a data transmission method is characterized in that, comprising:
When cross-domain switching takes place when, the information that connects according to the transmission control protocol TCP of the receiving terminal of the cross-domain switching of described generation, in aiming field, create with the TCP of the receiving terminal that cross-domain switching takes place and connect corresponding TCP performance enhancing module, to be used for transfer of data, wherein, the information of described TCP connection comprises source port, destination interface, source address and destination address.
2. data transmission method as claimed in claim 1 is characterized in that, the link information of described TCP is obtained in the following manner:
The message that the wireless access network element in reception sources territory sends, the message that sends according to the wireless access network element in territory, described source is obtained the link information of described TCP; Perhaps,
Receive the tcp data bag, obtain the link information of TCP according to the packet of described reception.
3. data transmission method as claimed in claim 2 is characterized in that, described method also comprises:
Judge according to the link information of the TCP that obtains whether described aiming field exists with the TCP of the receiving terminal of the cross-domain switching of described generation and connect corresponding TCP performance enhancing module, if described aiming field does not exist described TCP performance to strengthen module, carry out and create the step that described TCP performance strengthens module.
4. data transmission method as claimed in claim 1 is characterized in that, creates in aiming field with after the TCP of the receiving terminal that cross-domain switching takes place connects corresponding TCP performance enhancing module described, also comprises:
Obtain the announcement window numerical value and the ACK sequence number of described receiving terminal according to the affirmation message ACK of described receiving terminal feedback;
Obtain the actual size of receiver window of the receiving terminal of the cross-domain switching of described generation according to described announcement window numerical value and described ACK sequence number.
5. data transmission method as claimed in claim 4 is characterized in that, the actual size of the receiver window of the described receiving terminal that obtains the cross-domain switching of described generation according to described announcement window numerical value and described ACK sequence number comprises:
A, obtain the maximum sequence number in the packet of reception, calculate the data length sum max_seq that the maximum sequence number in the packet of described reception is carried with it;
The difference res_ult of the sequence number snd_una of wait acknowledge in the transmission buffer memory of B, calculating max_seq and described TCP performance enhancing module;
C, if res_ult greater than snd_wnd, then increases by 1 with variable ws, and with new variable ws new variables more, wherein, ws is the scalable factor of the window of described receiving terminal, snd_wnd=rwnd * 2
Ws, rwnd is the announcement window numerical value of described receiving terminal;
The sequence number snd_una of wait acknowledge in the transmission buffer memory of D, the described TCP performance enhancing of renewal module, and circulation step A, B and C, scalable factor ws increases to a set point until the window of described receiving terminal, and this variations per hour snd_wnd income value is the actual size of current receiver window in the described receiving terminal.
6. data transmission method as claimed in claim 5 is characterized in that, the sequence number snd_una of wait acknowledge comprises in the transmission buffer memory of the described TCP performance enhancing of described renewal module:
The affirmation sequence of message of receiving terminal feedback number and strengthen the sequence number snd_una of current wait acknowledge in the transmission buffer memory of module with the TCP performance is relatively got the sequence number snd_una of wait acknowledge in higher value among both strengthens module for the TCP performance the transmission buffer memory.
7. as each described data transmission method of claim 1 to 6, it is characterized in that in described data transmission procedure, the congestion window capacity that strengthens module when described TCP performance strengthens the k of the buffer memory capacity of module less than the TCP performance of described correspondence
1Times the time, then confirm to need increase the transmission speed of transmitting terminal, the affirmation message that duplicates described receiving terminal is sent to transmitting terminal, wherein, k
1Size is between 0 and 1.
8. as each described data transmission method of claim 1 to 6, it is characterized in that, in described data transmission procedure, when described TCP performance strengthen module receive a repetitive data packet and receive this repetitive data packet with the time difference of the packet of reception last time greater than preset threshold, then confirm to need to increase the transmission speed of transmitting terminal, the affirmation message that duplicates described receiving terminal is sent to transmitting terminal.
9. data transmission method as claimed in claim 1 is characterized in that, described method also comprises:
Control the congestion window capacity that described TCP performance strengthens module, strengthen the k of the buffer memory capacity of module at described congestion window capacity more than or equal to described TCP performance
2Times the time, stop to enlarge the congestion window capacity, wherein, k
2Size is between 0 and 1.
10. a wireless access network element is characterized in that, comprising:
Acquisition module is used to obtain the information that the transmission control protocol TCP of the receiving terminal that cross-domain switching takes place connects, and wherein, described TCP link information comprises source port, destination interface, source address and destination address at least;
Creation module, the information that the TCP that is used for obtaining according to described acquisition module connects are created the TCP performance at aiming field and are strengthened module, to be used for transfer of data.
11. wireless access network element as claimed in claim 10 is characterized in that, described wireless access network element also comprises:
Judge module, the link information that is used for the TCP that obtains according to described acquisition module is judged whether described aiming field exists with the TCP of the receiving terminal of the cross-domain switching of described generation and is connected corresponding TCP performance enhancing module, if described aiming field does not exist described TCP performance to strengthen module, carry out and create the step that described TCP performance strengthens module.
12. wireless access network element as claim 11, it is characterized in that described judge module judges according to the link information of the TCP that the tcp data bag that receives carries whether described aiming field exists the TCP of the receiving terminal that cross-domain switching takes place to connect corresponding TCP performance and strengthen module; Perhaps, described judge module judges according to the information that the TCP performance of territory, the source receiving terminal that is sent by territory, source wireless access network element when the TCP connection is set up strengthens the TCP connection that module comprised whether described aiming field exists the TCP of the receiving terminal that cross-domain switching takes place to connect corresponding TCP performance enhancing module.
13. wireless access network element as claimed in claim 10 is characterized in that, described wireless access network element also comprises:
The receiver window acquisition module, the actual size that is used for the receiver window of the receiving terminal that announcement window numerical value and ACK sequence number according to described receiving terminal obtain the cross-domain switching of described generation, wherein, obtain the announcement window numerical value and the ACK sequence number of described receiving terminal according to the affirmation message ACK of described receiving terminal feedback.
14. wireless access network element according to claim 13 is characterized in that, described receiver window acquisition module comprises:
The maximum sequence number acquiring unit is used for obtaining the maximum sequence number of the packet of reception, calculates the data length sum max_seq that the maximum sequence number in the packet of described reception is carried with it;
Difference computational unit is used for calculating the difference res_ult of sequence number snd_una that max_seq and described TCP performance strengthen the transmission buffer memory wait acknowledge of module;
Intermediate variable increases progressively the unit, is used for calculating the res_ult of gained greater than rwnd * 2 in described difference computational unit
WsThe time, variable ws is increased by 1, and with new variable ws new variables more, wherein, ws is the scalable factor of the window of described receiving terminal, snd_wnd=rwnd * 2
Ws, rwnd is the announcement window numerical value of described receiving terminal;
Updating block, be used for upgrading the sequence number snd_una that described TCP performance strengthens the transmission buffer memory wait acknowledge of module, and circulation step A, B and C, scalable factor ws increases to a set point until the window of described receiving terminal, and this variations per hour snd_wnd income value is the actual size of current receiver window in the described receiving terminal;
Described steps A comprises: obtain the maximum sequence number in the packet of reception, calculate the data length sum max_seq that the maximum sequence number in the packet of described reception is carried with it;
Described step B comprises: the difference res_ult of the sequence number snd_una of wait acknowledge in the transmission buffer memory of calculating max_seq and described TCP performance enhancing module;
Described step C comprises: if res_ult is greater than snd_wnd, then variable ws is increased by 1, and with new variable ws new variables more.
15. wireless access network element according to claim 10 is characterized in that, described wireless access network element also comprises:
Accelerating module is used for strengthening the k of the congestion window capacity of module less than described TCP performance enhancement mode block cache capacity in described TCP performance
1Times the time or when described TCP performance strengthens module and receives a repetitive data packet and receive this repetitive data packet with the time difference of the packet of reception last time greater than preset threshold, the affirmation message that duplicates reception is sent to transmitting terminal so that transmitting terminal increases the transmission speed of data, wherein, described k
1Size between 0 and 1; And/or
Control module is used to control the congestion window capacity that described TCP performance strengthens module, strengthens the k of the buffer memory capacity of module more than or equal to the TCP performance of described correspondence at described congestion window capacity
2Times the time, stop to enlarge the congestion window capacity, wherein, described k
2Size between 0 and 1.
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| EP2530898B1 (en) * | 2011-06-03 | 2014-02-12 | Alcatel Lucent | Method and apparatus for mitigating buffering delay at a network edge |
| CN103067992A (en) * | 2012-12-04 | 2013-04-24 | 大唐移动通信设备有限公司 | Method and system for transmission control protocol (TCP) business processing |
| CN103974339B (en) * | 2013-01-28 | 2018-01-16 | 华为技术有限公司 | A kind of method and apparatus of data buffer storage |
| CN104427492B (en) * | 2013-08-19 | 2019-01-01 | 中兴通讯股份有限公司 | It was found that the method for the WLAN access net gateway address trusted |
| KR20180096760A (en) * | 2015-12-24 | 2018-08-29 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Data transmission method and network device |
| CN106713432B (en) * | 2016-12-13 | 2019-11-05 | 深信服科技股份有限公司 | Data cache method and network agent equipment |
| CN108206812A (en) * | 2016-12-19 | 2018-06-26 | 展讯通信（上海）有限公司 | The method, device and mobile terminal of fast quick-recovery transmission control protocol connection |
| CN108270682B (en) * | 2016-12-30 | 2022-06-24 | 华为技术有限公司 | Message transmission method, terminal, network equipment and communication system |
| CN107302502B (en) * | 2017-07-25 | 2020-02-07 | 武汉思创易控科技有限公司 | Terminal processing method and device |
| CN109495388B (en) * | 2018-11-30 | 2021-04-27 | 四川安迪科技实业有限公司 | TCP acceleration method based on satellite communication |
| CN114253900A (en) * | 2020-09-21 | 2022-03-29 | 深圳市中兴微电子技术有限公司 | Data transmission and processing method, distributed unit, radio frequency unit and medium |
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