CN105577560B - Data transmission system and method - Google Patents
Data transmission system and method Download PDFInfo
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- CN105577560B CN105577560B CN201610081151.3A CN201610081151A CN105577560B CN 105577560 B CN105577560 B CN 105577560B CN 201610081151 A CN201610081151 A CN 201610081151A CN 105577560 B CN105577560 B CN 105577560B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/18—End to end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/38—Flow based routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/25—Routing or path finding in a switch fabric
- H04L49/253—Routing or path finding in a switch fabric using establishment or release of connections between ports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/09—Mapping addresses
- H04L61/25—Mapping addresses of the same type
- H04L61/2503—Translation of Internet protocol [IP] addresses
- H04L61/256—NAT traversal
- H04L61/2575—NAT traversal using address mapping retrieval, e.g. simple traversal of user datagram protocol through session traversal utilities for NAT [STUN]
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Communication Control (AREA)
Abstract
The present invention provides a kind of data packet, data transmission system and methods, wherein data transmission system, and including the first data terminal and the second data terminal, the two is based on UDP progress NAT and passes through.First data terminal will need the application data that send to be divided into multiple data cells, and using each data cell as loading to form one first data packet；First data packet is sent to the second data terminal by first data terminal；Second data terminal receives first data packet, and the serial number in first data packet and confirmation number handle it.It is achieved thereby that transmitting end to end, and intermediate routing node chooses best routing for the flow of communication automatically, and then realizes the optimization of the whole network efficiency.
Description
Technical field
The present invention relates to Internet communication technology field, especially a kind of data packet, data transmission system and method.
Background technology
Universal with Internet, more and more equipment are started with remote access capability by access internet.IP
Therefore address becomes a kind of scarce resource.To solve IP address tcam-exhaustion, NAT (Network Address
Translation, network address translation) it is widely used.Although NAT is to solve IP address effective way in short supply, but
Carry out communication band to by network come some troubles, especially after the both sides of communication are all located at NAT when.
The method for realizing end-to-end transmitting at present relies on TCP, and (Transmission Control Protocol are transmitted
Control protocol).However TCP, when needing passing through NAT after the both sides of communication are all located at NAT, that passes through is difficult, and
Success rate is low.For this purpose, the communicating pair after NAT will usually communicate by the mode that server forwards.Use clothes
Business device forwarding although can reach the purpose of communication, can generate server answering for higher requirement, especially high bandwidth
With being more likely to that processing bottleneck can be generated on the server.Communication delay end to end can also be increased by server forwarding.Separately
Outside, from network on the whole, more networks are also necessarily consumed compared to direct communication end to end by server forwarding to provide
Source.
Invention content
The purpose of the present invention is to provide a kind of data packet, data transmission system and methods, reliable end to end to realize
Transmission, intermediate routing node chooses best routing for the flow of communication automatically, so as to fulfill the optimization of the whole network efficiency.
In order to achieve the above object, the present invention provides a kind of data packets, and including packet header and load, the packet header includes class
Type, serial number and confirmation number, wherein, the type includes data type, confirms type and negative confirmation type；
When the type in the packet header is data type, the load is using data, and the serial number is the data packet
Ordinal position in the data of transmission, it is described to confirm number serial number for next data packet received for expectation；
It is described to confirm number sequence for next data packet received for expectation when the type in the packet header is confirms type
Number, the serial number and load are sky；
When the type in the packet header is negative confirmation type, the serial number receives and unreceived data packet it is expected
Serial number, it is described confirm number and load for sky.
Preferably, in above-mentioned data packet, the packet header further includes mark, to mark the structure of the data packet.
The present invention also provides a kind of data transmission system, including the first data terminal and the second data terminal；First number
UDP progress NAT is based on according to end and the second data terminal to pass through；First data terminal and the second data terminal transmission data with
Above-mentioned data packet is transmitted.
Preferably, in above-mentioned data transmission system, the first data terminal setting one first sends window, capacity
Determine that first data terminal does not receive the maximum value of the quantity of the data packet of confirmation message；Second data terminal setting 1 the
One receives window so that second data terminal receives multiple data packets when not receiving the data packet for it is expected to receive.
Preferably, in above-mentioned data transmission system, the second data terminal setting one second sends window, capacity
Think that second data terminal does not receive the maximum value of the quantity of the data packet of confirmation message；First data terminal setting 1 the
Two receive window so that first data terminal receives multiple data packets when not receiving the data packet for it is expected to receive.
The present invention more provides a kind of data transmission method, includes the following steps：
First data terminal will need the application data that send to be divided into multiple data cells, and using each data cell as
Load is with each one first data packet of self-forming；
First data packet is sent to second data terminal by first data terminal；
Second data terminal receives first data packet, and the serial number in first data packet and really
The number of recognizing handles it.
Preferably, in above-mentioned data transmission method, second data terminal is to received first data
The step of packet is handled includes：
When the serial number of first data packet fall into it is described first receive window in when, to first data packet into
Row caching；
When the serial number of first data packet receives serial number minimum in window for described first, second number
The second data packet for confirming type is sent to the first data terminal according to end, while the load in first data packet is sent to and is answered
Use program；Otherwise, the third data packet of negative confirmation type is sent to first data terminal；
When second data terminal is needed to the first data terminal transmission data, according in first data packet
Confirmation transmission data packet, otherwise, not transmission data packet.
Preferably, in above-mentioned data transmission method, when first data terminal receives second data packet,
Confirmation number in second data packet slides described first and sends window.
Preferably, in above-mentioned data transmission method, when first data terminal receives the third data packet,
The corresponding data packet of serial number in the third data packet is retransmitted immediately.
Preferably, in above-mentioned data transmission method, second data terminal is to received first data
The step of packet is handled further includes：When the serial number of first data packet, which falls into described first, to be received outside window, abandon
First data packet.
Preferably, in above-mentioned data transmission method, first data terminal is set while the first data packet is sent
An overtime timer is put, when first data terminal does not receive confirmation message yet in the time set beyond the overtime timer
When, then retransmit first data packet.
In data packet provided by the invention, data transmission system and method, the first data terminal and the second data terminal are based on
UDP carries out NAT and passes through, and the application data are first divided into multiple numbers by first data terminal before sending application data
According to unit, and according to each data cell as load to form the first data packet, then again by these first data packets one by one
The second data terminal is sent to, second data terminal is after first data packet is received, according in first data packet
Serial number and confirming number it is handled.It is achieved thereby that transmitting end to end, and intermediate routing node is automatic
Flow for communication chooses best routing, and then realizes the optimization of the whole network efficiency.
Description of the drawings
Fig. 1 is the schematic diagram of data packet in the embodiment of the present invention；
Fig. 2 is the structure diagram of data transmission system in the embodiment of the present invention；
Fig. 3 is the flow chart of data transmission method in the embodiment of the present invention；
Fig. 4 is the flow chart of step S4 in Fig. 3.
Specific embodiment
The specific embodiment of the present invention is described in more detail below in conjunction with schematic diagram.According to description below and
Claims, advantages and features of the invention will become apparent from.It should be noted that attached drawing is using very simplified form and
Using non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
An embodiment of the present invention provides a kind of data packet, as shown in Figure 1, data packet includes packet header and load, the packet header
Including type, serial number, confirmation number and mark, the type includes data type, confirms type and negative confirmation type.
Specifically, when the type is data type, the load is using data, and the serial number is the data packet in transmission
Ordinal position in data, it is described to confirm number serial number for next data packet received for expectation；When the type is true
Described to confirm number serial number for next data packet received for expectation when recognizing type, the serial number and load are sky；Work as institute
When stating type as negative confirmation type, the serial number is it is expected to receive and the serial number of unreceived data packet, the confirmation
Number and load for sky.The structure identified for marking the data packet.The effect of the mark with it is of the prior art
The effect of the mark of data packet is identical in ICP/IP protocol.
The embodiment of the present invention additionally provides a kind of data transmission system, as shown in Fig. 2, including the first data terminal 101 and
Two data terminals 102,101 and second data terminal 102 of the first data terminal be based on UDP (User Datagram Protocol,
User Datagram Protocol) it carries out NAT and passes through, and end-to-end connection is established according to the address after passing through and port numbers, to carry out
Data transmission.
The data of first data terminal, 101 and second data terminal 102 transmission are transmitted with above-mentioned data packet.
That is the data transmitted between 101 and second data terminal 102 of the first data terminal are passed in the form of data packet
It is defeated, and the data packet includes packet header and load, the packet header includes type, serial number, confirmation number and mark, the type packet
It includes data type, confirm type and negative confirmation type.
The setting of first data terminal 101 one first sends window so that first data terminal 101 is not receiving confirmation
Multiple data packets are sent during information, the capacity of the first transmission window determines that first data terminal does not receive confirmation message
The maximum value of the quantity of data packet.Meanwhile the setting of the second data terminal 102 one first receives window so that second number
According to end 102 multiple data packets are received when not receiving the data packet for it is expected to receive.Since data transmission is two-way, that is,
Say that first data terminal 101 while to the second 102 transmission data of data terminal, can also receive second data terminal 102
The data of transmission, therefore, the setting of the second data terminal 102 one second send window so that second data terminal 102 is not
Multiple data packets are sent when receiving confirmation message, capacity determines that second data terminal does not receive the data packet of confirmation message
The maximum value of quantity.Meanwhile the setting of the first data terminal 101 one second receives window so that first data terminal 101 exists
Multiple data packets are received when not receiving the data packet for it is expected to receive.Described first sends window, the first reception window, the second hair
Window and the second size for receiving window is sent to be independent from each other.The size of this four windows and first data terminal 101
It is related to the memory capacity of the second data terminal 102, the also network between 101 and second data terminal 102 of the first data terminal
Configuration is related, to the memory capacity consumption of 101 and second data terminal 102 of the first data terminal and network transfer speeds it
Between find an equalization point, with reach efficiency maximization, so as to fulfill data transmission bauds maximize.
Specific data transmission method is as shown in figure 3, include the following steps：
Step S1：First data terminal and the second data terminal are initialized.
Specifically, to described first send window, first receive window, second send window and second receive window into
At the beginning of the serial number of data packet that the serial number and expectation of row initialization and the data packet for sending first data terminal receive
Beginningization is to determining original state.For example, the serial number for the data packet for respectively sending first data terminal and expectation receive
The serial number of data packet initialize to 0.Similarly, the serial number of the data packet also sent second data terminal and expectation connect
The serial number of the data packet of receipts is initialized to determining original state.
Step S2：First data terminal will need the application data that send to be divided into multiple data cells, and by each data
Unit is used as load to form one first data packet.
Specifically, being split using data according to certain size of will sending of first data terminal, will described in
The application data to be sent are divided into multiple data cells, and the size of each data cell is less than or equal to 1.5KB, to prevent
Because IP is segmented the influence to amplify message dropping generation when data are transmitted by IP agreement.
Then first data packet is formed according to each data cell, first data packet is data type data
It wraps, the serial number in first data packet is ordinal position of first data packet in the data of transmission, described
Confirm number serial number for next data packet sent it is expected reception second data terminal, the load is the multiple number
According to one in unit.In the present embodiment, when carrying out first time data transmission after initialization, in first data packet
Confirmation number is 0.
Step S3：First data packet is sent to the second data terminal by first data terminal.
While first data packet is sent to second data terminal by first data terminal, described first is counted
It is sent in window according to packet caching to described first, and an overtime timer is set.When more than set by the overtime timer
When first data terminal described in time does not receive the confirmation data packet of first data packet yet, update in first data packet
Confirmation number retransmits first data packet, and resets the overtime timer.
The network delay between time and first data terminal and the second data terminal set by the overtime timer
Correlation, when the network delay is big, the time set by the overtime timer is just grown, when the network delay is small, institute
The time set by overtime timer is stated with regard to small.
When the data packet that caching has been filled in the described first transmission window, and first data terminal does not receive these and delays
During the data packet of the confirmation type for the data packet deposited, first data terminal will not retransmit new data packet.
Step S4：Second data terminal receives first data packet, and suitable in first data packet
Sequence and Acknowledgment Number handles it.
Specifically as shown in figure 4, including the following steps：
Step S41：When the serial number of first data packet, which falls into described first, to be received in window, counted to described first
It is cached according to packet.Then step S42 is carried out.
Step S42：When the serial number of first data packet receives serial number minimum in window for described first, institute
It states the second data terminal and sends second data packet for confirming type to the first data terminal, while will be negative in first data packet
Load is sent to application program；Otherwise, the third data packet of a negative confirmation type is sent to first data terminal.
That is, since what is recorded in the described first reception window is that second data terminal it is expected the data received
The serial number of packet when the serial number of first data packet receives serial number minimum in window for described first, is said
Bright first data packet is that second data terminal currently most it is expected the data packet received, therefore, directly by described
Load in one data packet is sent to application program, while deletes caching of second data terminal to first data packet.
Second data packet is sent to first data terminal simultaneously, second data packet confirms type data packets for one, described
Confirm number serial number for next data packet received for second data terminal expectation in second data packet.When described first
After data terminal receives second data packet, the confirmation number in second data packet slides described first and sends window
Mouthful, to send follow-up data packet.
When second data terminal is to receive these data according to the transmission sequence of the first data terminal transmission data packet
Bao Shi, the confirmation number in second data packet are (serial number+1 in first data packet), i.e., described second data terminal
It is expected to receive next data packet of first data packet.When second data terminal receives sequence and the institute of these data packets
When stating the transmission sequence difference of the first data terminal, the confirmation number of second data packet will not update.
When the serial number of first data packet be not described first receive minimum serial number in window when, then described the
All still unreceived first data packets before two data terminals send the packet sequence No. first to first data terminal
Negative confirmation type third data packet.After first data terminal receives the third data packet, immediately described in repeating transmission
The corresponding data packet of serial number in third data packet.
Specifically, for example, the described first capacity for sending window is 10, that is to say, that first data terminal can be simultaneously
10 first data packets are sent, the serial number of this 10 the first data packets is respectively 1-10, and second data terminal receives
To the number of data packet be 1,3 and 4, at this time second data terminal send that number is 1 to first data terminal the
The confirmation data packet of one data packet, at this point, confirm that the confirmation number in data packet is 2, the slip described first of first data
Send window so that the number of the first data packet included in the first transmission window is 2-11.Second data simultaneously
First data packet of number 1 is sent to application program by end, and deletes the caching to the first data packet of number 1.To marked as 3
With 4 the first data packet, second data terminal is respectively to first data terminal transmission negative confirmation data packet (third data
Packet), the serial number in two negative confirmation data packets is 2.First data terminal receives the two negative confirmation data
Bao Hou retransmits the first data packet marked as 2 immediately.When second data terminal receives the first data that the number is 2
Bao Hou sends to first data terminal and confirms data packet (the second data packet), and the confirmation number in the confirmation data packet is 5.Institute
State the first data terminal slide the first transmission window make it includes the number of the first data packet be 5-14.Meanwhile described
Two data terminals will number the first data packet for being 2-4 and be sent to application program, and delete the first data packet for being 2-4 to number
Caching.When still there is data to need to send, first data terminal directly transmits data packet 12,13 and 14；When not counting
During according to needing to send, first data terminal does not retransmit new data.Certainly, second data terminal is receiving number
After 2 the first data packet, the first data packet that can be 2-4 to number is sent respectively to first data terminal confirms data packet
(the second data packet), first data terminal confirm that data packet is required to slide the first transmission window for each.
When first data terminal is not when receiving second data packet time set more than the overtime timer,
Then first data packet is retransmitted to second data terminal.
Step S43：When second data terminal is needed to the first data terminal transmission data, according to the described first number
According to the confirmation transmission data packet in packet, otherwise, not transmission data packet.
When needing to carry out bidirectional data communication between first data terminal and the second data terminal, second data terminal
Confirmation transmission data packet in first data packet, the number which receives for first data terminal expectation
According to packet.When between first data terminal and the second data terminal without bidirectional data communication, that is to say, that when second data
Hold no data to first data terminal be transmitted when, then not transmission data packet, in this case, first data
It is 0 always to hold the confirmation number into the data packet for the data types that second data terminal is sent.
Step S44：When the serial number of first data packet, which falls into described first, to be received outside window, described first is abandoned
Data packet.
And when the serial number of first data packet falls into described first and receives outside window, second data terminal is direct
By first data packet discarding, without caching.
In the present embodiment, first data terminal and the second data terminal be based on UDP carry out NAT pass through, in the present invention
Other embodiment in, first data terminal and the second data terminal can not also carry out NAT and pass through.It is that is, of the invention
In data transmission method apply also for non-NAT environment.
To sum up, in data packet provided in an embodiment of the present invention, data transmission system and method, the first data terminal and second counts
UDP progress NAT is based on according to end to pass through, first data terminal first draws the application data before sending application data
Be divided into multiple data cells, and according to each data cell as load to form the first data packet, then again by these first
Data packet is sent to the second data terminal one by one, and second data terminal is after first data packet is received, according to described
Serial number and confirmation number in one data packet handle it.It is achieved thereby that transmitting end to end, and intermediate road
Best routing is chosen, and then realize the optimization of the whole network efficiency for the flow of communication by node automatically.
The preferred embodiment of the present invention is above are only, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of technical scheme of the present invention is not departed from, to the invention discloses technical solution and
Technology contents make the variations such as any type of equivalent replacement or modification, belong to the content without departing from technical scheme of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (9)
1. a kind of data transmission system, which is characterized in that including the first data terminal and the second data terminal；First data terminal and
Second data terminal is based on UDP progress NAT and passes through；First data terminal and the data of the second data terminal transmission are with data packet
It is transmitted；
The data packet includes packet header and load, and the packet header includes type, serial number and confirmation number, wherein, the type
Including data type, confirm type and negative confirmation type；
When the type in the packet header is data type, the load is using data, and the serial number is being passed for the data packet
Ordinal position in defeated data, it is described to confirm number serial number for next data packet received for expectation；
It is described to confirm number serial number for next data packet received for expectation when the type in the packet header is confirms type,
The serial number and load are sky；
When the packet header type be negative confirmation type when, the serial number be expectation receive and unreceived data packet it is suitable
Serial number, the confirmation number and load are sky.
2. data transmission system as described in claim 1, which is characterized in that the first data terminal setting one first sends window
Mouthful, capacity determines that first data terminal does not receive the maximum value of the quantity of the data packet of confirmation message；Second data
End setting one first receives window so that second data terminal receives multiple numbers when not receiving the data packet for it is expected to receive
According to packet.
3. data transmission system as described in claim 1, which is characterized in that the second data terminal setting one second sends window
Mouthful, capacity determines that second data terminal does not receive the maximum value of the quantity of the data packet of confirmation message；First data
End setting one second receives window so that first data terminal receives multiple numbers when not receiving the data packet for it is expected to receive
According to packet.
4. the method that the data transmission system in a kind of 1-3 such as claim as described in any one carries out data transmission, feature
It is, includes the following steps：
The application data for needing to send are divided into multiple data cells by the first data terminal, and using each data cell as load
With each one first data packet of self-forming；
First data packet is sent to second data terminal by first data terminal；
Second data terminal receives first data packet, and the serial number in first data packet and confirmation number
It is handled.
5. data transmission method as claimed in claim 4, which is characterized in that second data terminal is to described in received
The step of first data packet is handled includes：
When the serial number of first data packet, which falls into described first, to be received in window, first data packet is delayed
It deposits；
When the serial number of first data packet receives serial number minimum in window for described first, second data terminal
The second data packet for confirming type is sent to the first data terminal, while the load in first data packet is sent to using journey
Sequence；Otherwise, the third data packet of negative confirmation type is sent to first data terminal；
When second data terminal is needed to the first data terminal transmission data, according to the confirmation in first data packet
Number transmission data packet, otherwise, not transmission data packet.
6. data transmission method as claimed in claim 5, which is characterized in that when first data terminal receives described second
During data packet, the confirmation number in second data packet slides described first and sends window.
7. data transmission method as claimed in claim 5, which is characterized in that when first data terminal receives the third
During data packet, the corresponding data packet of serial number in the third data packet is retransmitted immediately.
8. data transmission method as claimed in claim 5, which is characterized in that second data terminal is to described in received
The step of first data packet is handled further includes：It is received outside window when the serial number of first data packet falls into described first
When, abandon first data packet.
9. data transmission method as claimed in claim 4, which is characterized in that first data terminal is sending the first data packet
While one overtime timer is set, when first data terminal does not receive yet in the time set beyond the overtime timer
During confirmation message, then first data packet is retransmitted.
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| CN201610081151.3A CN105577560B (en) | 2016-02-04 | 2016-02-04 | Data transmission system and method |
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| CN201610081151.3A CN105577560B (en) | 2016-02-04 | 2016-02-04 | Data transmission system and method |
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| CN106685854B (en) * | 2016-12-09 | 2020-02-14 | 浙江大华技术股份有限公司 | Data sending method and system |
| EP3535956B1 (en) | 2016-12-09 | 2021-02-17 | Zhejiang Dahua Technology Co., Ltd | Methods and systems for data transmission |
| CN115022281B (en) * | 2022-06-16 | 2023-07-14 | 杭州楷知科技有限公司 | NAT penetration method, client and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854738A (en) * | 2010-05-21 | 2010-10-06 | 南京邮电大学 | Transmission control protocol method for satellite network |
| CN103647625A (en) * | 2013-11-19 | 2014-03-19 | 中国科学院计算技术研究所 | Link-based data reliable transmission method |
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2016
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854738A (en) * | 2010-05-21 | 2010-10-06 | 南京邮电大学 | Transmission control protocol method for satellite network |
| CN103647625A (en) * | 2013-11-19 | 2014-03-19 | 中国科学院计算技术研究所 | Link-based data reliable transmission method |
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