CN114598377A - Reliable data transmission system based on satellite network - Google Patents
Reliable data transmission system based on satellite network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1806—Go-back-N protocols
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/164—Adaptation or special uses of UDP protocol
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Abstract
The invention relates to a reliable data transmission system based on a satellite network, which mainly relates to the technical field of real-time communication and comprises a data sending terminal and a data receiving terminal, wherein the data sending terminal adopts a UDP protocol to send first data information outwards, the data receiving terminal receives second data information of the data sending terminal, and in the process of receiving the data information, a packet loss management module determines packet loss information and sends ACK information generated by the data receiving module to the data sending terminal, wherein the ACK information carries the packet loss information; the data sending terminal sends a request for retransmission to the data information corresponding to the packet loss information; when the congestion control module monitors that congestion occurs, the congestion control mechanism is started to reduce the data transmission delay. The invention has the beneficial effects that: the data transmission cost is reduced, the data transmission integrity and the data transmission quality are improved, the condition that the concurrent bandwidth is excessively occupied in the data transmission process is avoided, the data transmission rate is improved, and the time delay is effectively reduced.
Description
Technical Field
The invention relates to the technical field of real-time communication, in particular to a reliable data transmission system based on a satellite network.
Background
There is a triangular balance relationship in the field of real-time communications: cost, quality and time delay. That is, there is a triangular constraint (LEQ) relationship between the input cost, the obtained quality and the communication delay, so the designer of the real-time communication system will find a balance point under these three constraints. TCP (Transmission Control Protocol) is a communication method for guaranteeing quality by increasing delay and Transmission cost, and UDP (User Datagram Protocol) is a communication method for guaranteeing delay and cost by sacrificing quality.
Since the satellite network belongs to a low-bandwidth network and has the characteristics of easy packet loss and easy delay, researchers have proposed many improved versions of TCP, such as Westwood, Veno, BIC, etc., which can improve the communication efficiency to a certain extent when applied to the satellite network, but the flexibility of the modifications is limited to a certain extent when the modifications are to keep the compatibility of the existing TCP versions. Also, TCP transmission has the following problems:
1. end-to-end connectivity issues: generally, the direct communication between a terminal and the terminal involves NAT traversal, TCP traversal is very difficult to realize on NAT, and UDP traversal on NAT is relatively simple;
2. weak network environment transmission problem: under some WIFI or 3G/4G mobile networks, low-delay reliable communication is required, and if TCP communication delay is possibly very large, the user experience is influenced;
3. the bandwidth competition problem is as follows: sometimes, client data uploading needs to break through the limit of TCP fairness per se to achieve high speed, low delay and stability, namely, a special flow control algorithm is used for squeezing client uploading bandwidth;
4. resource optimization problem: some scenarios require a process that avoids the three-way handshake and four-way waving of TCP.
The UDP-based application layer protocol may be widely applied to data transmission in a specific field without being limited by the existing protocol specification. The UDP protocol is a connectionless protocol and has the advantages of low resource consumption and high processing speed, but the UDP protocol is unreliable, cannot ensure the correctness of a data packet, has no confirmation mechanism, is transmitted out of order in a network, and is easy to lose packets under the condition of poor network conditions. The UDP protocol only sends out a data packet that an application program transmits to the IP layer, and does not guarantee that the data packet can reach a destination, so that it is impossible to determine whether data arrives or whether data is correct when the UDP is used for sending data in a network.
At the same time, congestion will occur if the network provides insufficient resources to meet the needs of the user, including buffer space, link bandwidth capacity, and processing power of the intermediate nodes. The lack of "admission control" capability due to the design mechanism of the internet may not limit the number of users when network resources are insufficient, but may continue to serve users only by reducing the quality of service.
Chinese patent publication No. CN104243097A discloses a data transmission method and system based on a satellite network, which adjust the execution flow by obtaining the packet loss rate during the real-time monitoring of the data transmission process through network monitoring, so as to avoid congestion: the C _ loss packet loss rate is sent to strategy control for judgment, when the packet loss rate is not greater than an upper cut threshold C _ up (C _ up is 0, which indicates no packet loss), a flow lifting strategy is executed, and K is lifted every second (K is 10Kbps, the fixed length is slowly increased); if the packet loss rate C _ loss is greater than the down cut threshold value C _ down (C _ down is 5%), the traffic reduction strategy is executed, multiplied by a speed reduction factor > 1. If the packet Loss rate is higher, the effect is that the 1-C _ Loss is smaller, the target code rate reduction speed is higher, so that congestion can be avoided effectively, and the bandwidth utilization rate is improved higher when the bandwidth is high in the packet Loss rate. However, congestion cannot be fundamentally avoided by adjusting the execution flow, and the problem of time delay in the data transmission process cannot be effectively solved.
Based on the characteristics, the data transmission is carried out under the network environment with high delay and high packet loss rate by utilizing the prior art, and a balance point cannot be found under the three conditions of cost, quality and time delay to ensure the time delay and quality of communication and reduce the cost as much as possible.
Disclosure of Invention
Therefore, the invention provides a reliable data transmission system based on a satellite network, which is used for overcoming the technical problems of high data transmission cost, low quality and prolonged time in the satellite network in the prior art.
To achieve the above object, the present invention provides a reliable data transmission system based on a satellite network,
the data sending terminal is used for sending first data information outwards by adopting a UDP protocol;
the data receiving terminal is used for receiving second data information of the data sending terminal, and in the process of receiving the data information, if the data length of the second data information is different from that of the first data information, a packet loss management module arranged in the data receiving terminal is started, determines packet loss information and sends the packet loss information to the data sending terminal;
the packet loss information is a plurality of address information corresponding to the difference information of the first data information and the second data information;
a congestion control module is arranged in the data sending terminal, and after receiving a plurality of address information, the congestion control module sequences the data volume of corresponding difference information in the plurality of address information to form a data volume list;
and the data sending terminal sequentially transmits the corresponding difference information in the address information according to the sequence of the data volume list.
Furthermore, an ACK sampling module and a first clock module are further arranged in the data sending terminal, the ACK sampling module is connected with the congestion control module and is used for receiving an ACK message sent by the data receiving terminal, a retransmission timeout period is preset in the first clock module, after the data sending terminal receives the ACK message, data content contained in the ACK message is determined, and a response strategy is determined according to the data content and the retransmission timeout period.
Further, the determining a response policy according to the data content and the retransmission timeout period includes:
after the data sending terminal sends the first data information to the data receiving terminal, in a preset retransmission timeout period, the data sending terminal does not receive an ACK message sent by the data receiving terminal in a corresponding time, and then the data sending terminal sends timeout retransmission to the first data information;
after the data sending terminal sends the first data information to the data receiving terminal, the data sending terminal receives an ACK message sent by the data receiving terminal and the packet loss information carried by the ACK message, and then the data sending terminal sends a request for retransmission to the data information corresponding to the packet loss information.
Further, when first data information is sent, a first data window is further arranged in the data sending terminal, the first data window is used for carrying out data division on the first data information, dividing the first data information into a plurality of data blocks, and allocating address information to each data block;
setting a start data address base0 ═ m in the first data window, then the first data window allocates addresses to the data blocks, and the addresses are sequentially base1 ═ m +1, base2 ═ m +2, base3 ═ m +3, base4 ═ m +4 … …, and base i ═ m + i in sequence;
and the data sending module transmits the first data information to the data receiving terminal according to the address sequence of the data block.
Further, when receiving second data information, a data receiving module, a data caching module and a second data window are also arranged in the data receiving terminal; wherein, the first and the second end of the pipe are connected with each other,
the data receiving module is used for receiving the second data information and generating a first ACK message; the data receiving module is connected with the data caching module and used for sending the data of the second data information to the data caching module; the data receiving module is connected with the second data window and used for sending the address information of the first ACK message and the second data message to the second data window;
the second data window sequences the address information of the second data information and judges the continuity of data transmission, and when the address information base (i-1) and base i of the second data information received by the second data window are null, the second data window judges that the address information base (i-1) and base i are first packet loss information;
and the second data window sends the first ACK message and the first packet loss information to the packet loss management module.
Further, determining data content contained in the first ACK message, if the first ACK message carries first packet loss information, the packet loss management module transmitting the first ACK message and the first packet loss information back to the ACK sampling module of the sending terminal through an ACK protocol, and the ACK sampling module sending a first retransmission request to the first data window; the ACK sampling module sends the first ACK message and the first packet loss information to the first data window, the first data window fills up the corresponding data information of the first packet loss information, namely base (i-1) and base i, and sends the data information to the data sending module, and the data sending module transmits the data information corresponding to the first packet loss information to the data receiving module.
Further, in the process that the data sending module sends a first request for retransmission, the data receiving module receives arrival data information of the first packet loss information and then generates a second ACK message, the data receiving module sends the arrival data information of the first packet loss information to the data buffer and sends the second ACK message and address information corresponding to the arrival data information of the first packet loss information to the second data window, the second data window sorts the address information corresponding to the arrival data information of the first packet loss information and judges the continuity of data transmission, and the second packet loss information is judged and sent to the packet loss manager;
the packet loss management module transmits the second ACK message and the second packet loss information back to an ACK sampling module of the sending terminal through an ACK protocol; the ACK sampling module determines data content contained in a second ACK message, and if the second ACK message carries second packet loss information, the ACK sampling module sends a second retransmission request to the first data window; the ACK sampling module sends the second ACK message and the second packet loss information to the first data window, the first data window reads the second packet loss information, fills the corresponding data information and sends the data information to the data sending module, and the data sending module transmits the data information of the second packet loss information to the data receiving module;
in the process that the data sending module sends out the (n-1) th request retransmission, the data receiving module generates an n ACK message; and the ACK sampling module determines the data content contained in the nth ACK message, and if the nth ACK message does not carry the packet loss information, the data sending terminal judges that the first data information is successfully sent to the data receiving terminal.
Further, the congestion control module is respectively connected with the ACK sampling module and the first data window, and is configured to monitor and control whether the data amount of the packet loss information sent by the ACK sampling module is congested in real time, and when the congestion control module determines that the packet loss data transmission is congested, start a congestion control mechanism;
after the congestion control module receives a plurality of pieces of address information, the congestion control module sorts the data volumes of the corresponding difference information in the plurality of pieces of address information from small to large in sequence to form a data volume list;
setting a maximum packet loss information data amount DQm in the congestion control module, wherein the actual packet loss information data amount is DQi, and when DQi is larger than or equal to DQm, the congestion control module judges that the packet loss information amount is large and starts a congestion control mechanism to limit the current of packet loss information data transmission;
the congestion control module sorts packet loss information quantity carried by the ACK message from small to large, and the congestion control module preferentially selects a data packet with small packet loss information quantity to request retransmission;
and when the packet loss information quantity carried by the ACK message is the same, the congestion control module preferentially selects the data packet which is prolonged in time to request retransmission.
Further, the first clock module records a time t1 when the data sending module sends the first data information, and a second clock module is further disposed in the data receiving terminal, and the second clock module records a time t2 when the data receiving module receives the second data information and generates the first ACK message, so that the first transmission time of the first data information is Δ t1 — t2-t 1;
the second clock module records a time t3 of the second ACK message, and then a second transmission time of the first data information is Δ t2-t 3-t 2;
the nth transmission time of the first data information is delta tn ═ tn + 1-tn;
setting standard overtime retransmission time Tr0 in the first clock module, setting actual data transmission interval time at each time as delta ti,
when delta ti is more than 0 and less than or equal to Tr0, the data sending terminal does not perform overtime retransmission;
and when the delta ti is larger than Tr0, the data sending terminal conducts overtime retransmission on the data information corresponding to the ith packet loss information.
Further, a standard time delay of successful transmission of the first data information from the data transmission terminal to the data reception terminal is set to be L0 in the first clock module, and an actual time delay is Li, where i is 1,2,3 … … n;
when Li is more than 0 and less than or equal to L0, the data sending terminal judges that the data transmission delay of the first data information is normal, and the congestion control module does not start the congestion control mechanism;
and when Li is larger than L0, the data sending terminal judges that the data transmission delay of the first data information is large, and then the congestion control mechanism is started and the delay is reduced.
Compared with the prior art, the invention has the advantages that the data transmission cost is reduced by adopting the UDP protocol to send data information outwards; the packet loss information is determined by the packet loss management module and is sent to the data sending terminal, so that the integrity and the quality of data transmission are improved; after the congestion control module sequences the data volumes of the corresponding difference information in the plurality of address information, the data sending terminal sequentially transmits the corresponding difference information in the address information according to the sequence of the data volume list, so that the condition that the concurrent bandwidth occupies too high in the data transmission process is avoided, the data transmission rate is improved, and the time delay is effectively reduced.
Particularly, the ACK sampling module receives the response strategy determined according to the data content and the retransmission timeout time period, and the data transmission efficiency is improved.
Particularly, after the data sending terminal does not receive the ACK message sent by the data receiving terminal in the corresponding time, the data sending terminal sends the overtime retransmission to the first data message, so that the data transmission can be repeated under the condition that no response is received for a long time, and the stability of the data transmission is improved; the data sending terminal sends a request for retransmission to the data information corresponding to the packet loss information after the data sending terminal receives the ACK information and the packet loss information carried by the ACK information, so that the data information corresponding to the packet loss information can be retransmitted in time under the condition of packet loss in data transmission, and the reliability of data transmission is improved.
Particularly, the first data information is divided into data blocks through a first data window of a data sending end, address information is distributed to each data block, the address information of the second data information is sequenced through a second data window of a data receiving end, the continuity of data transmission is judged, packet loss information in the data transmission process can be determined, and the accuracy of data transmission is improved;
particularly, the data content contained in the ACK message is determined by the ACK sampling module, retransmission is requested when the ACK message carries packet loss information, and the data sending terminal judges that the first data information is successfully sent to the data receiving terminal when the ACK message does not carry the packet loss information, so that the data transmission is more accurate, and the data transmission quality is improved.
Particularly, whether the data volume of the packet loss information sent by the ACK sampling module is congested is monitored in real time through the congestion control module, the data volume of the packet loss information is sequenced from small to large in sequence, and the data packet with the small data volume of the packet loss information is preferentially selected to request retransmission, so that the congestion generated in the data transmission process can be effectively controlled and relieved, and the data transmission delay is reduced.
Particularly, the first clock module records the time when the data sending module sends the first data information, the second clock module records the time when the data receiving module receives the second data information and generates the first ACK information, whether data transmission is overtime or not can be judged through the time difference, an overtime request is sent out in time, and the stability of data transmission is improved.
Particularly, the data transmission delay is calculated through the first clock module, and when the data transmission terminal judges that the data transmission delay of the first data information is large, the congestion control mechanism is started to reduce the delay, so that the waiting time of data transmission is shortened, and the data transmission efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a reliable data transmission system based on a satellite network according to the present invention;
in the figure: 1. a data transmission terminal; 2. a data receiving terminal; 3. a first data window; 4. a data transmission module; 5. an ACK sampling module; 6. a congestion control module; 7. a data receiving module; 8. a data caching module; 9. a second window of data; 10. a packet loss management module; 11. a first clock module; 12. and a second clock module.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the reliable data transmission system based on a satellite network according to an embodiment of the present invention may be implemented as follows:
the system includes a data transmission terminal 1 and a data reception terminal 2, wherein,
the data sending terminal 1 comprises a first data window 3, a data sending module 4, an ACK sampling module 5, a congestion control module 6 and a first clock module 11;
the data receiving terminal 2 includes a data receiving module 7, a data caching module 8, a second data window 9, a packet loss management module 10, and a second clock module 12.
The data sending terminal is used for sending first data information outwards by adopting a UDP protocol;
the data receiving terminal is used for receiving second data information of the data sending terminal, and in the process of receiving the data information, if the data length of the second data information is different from that of the first data information, a packet loss management module arranged in the data receiving terminal is started, determines packet loss information and sends the packet loss information to the data sending terminal;
the packet loss information is a plurality of address information corresponding to difference information of the first data information and the second data information;
after receiving a plurality of address information, a congestion control module arranged in the data sending terminal sorts the data volume of corresponding difference information in the plurality of address information to form a data volume list;
and the data sending terminal sequentially transmits the corresponding difference information in the address information according to the sequence of the data volume list.
The UDP protocol is adopted to send data information outwards, so that the cost of data transmission is reduced; the packet loss information is determined by the packet loss management module and is sent to the data sending terminal, so that the integrity and the quality of data transmission are improved; after the congestion control module sequences the data volumes of the corresponding difference information in the plurality of address information, the data sending terminal sequentially transmits the corresponding difference information in the address information according to the sequence of the data volume list, so that the condition that the concurrent bandwidth occupies too high in the data transmission process is avoided, the data transmission rate is improved, and the time delay is effectively reduced.
An ACK sampling module arranged in the data sending terminal is connected with the congestion control module and used for receiving an ACK message sent by the data receiving terminal, a retransmission timeout time period is preset in the first clock module, after the data sending terminal receives the ACK message, data content contained in the ACK message is determined, and a response strategy is determined according to the data content and the retransmission timeout time period. The data content includes two forms, one form is that the ACK message does not carry packet loss information, and the other form is that the ACK message carries packet loss information, that is, under the condition that packet loss information is generated in the process of each data transmission, the data content returned by the data receiving terminal to the ACK sampling module arranged in the data sending terminal is that the first ACK message carries first packet loss information or the second ACK message carries second packet loss information, and so on, the nth ACK message carries nth packet loss information.
Wherein the response policy includes:
after the data sending terminal sends the first data information to the data receiving terminal, in a preset retransmission timeout period, the data sending terminal does not receive an ACK message sent by the data receiving terminal in a corresponding time, and then the data sending terminal sends timeout retransmission to the first data information;
when the data sending terminal sends the first data information to the data receiving terminal, the data sending terminal receives an ACK message sent by the data receiving terminal and packet loss information carried by the ACK message, and then the data sending terminal sends a request for retransmission to the data information corresponding to the packet loss information.
After the data sending terminal does not receive the ACK message sent by the data receiving terminal in the corresponding time, the data sending terminal sends the overtime retransmission to the first data message, so that the data transmission can be repeated under the condition that the response is not received for a long time, and the stability of the data transmission is improved; the data sending terminal sends a request for retransmission to the data information corresponding to the packet loss information after the data sending terminal receives the ACK information and the packet loss information carried by the ACK information, so that the data information corresponding to the packet loss information can be retransmitted in time under the condition of packet loss in data transmission, and the reliability of data transmission is improved. And the ACK sampling module receives the response strategy determined according to the data content and the retransmission timeout time period, so that the data transmission efficiency is improved.
The specific implementation manner of the data transmission process that the data sending terminal sends the first data information to the data receiving terminal and sends the first data information successfully is as follows:
specifically, when first data information is sent, a first data window arranged in a data sending terminal is used for carrying out data division on the first data information, dividing the first data information into a plurality of data blocks, and allocating address information to each data block;
setting a start data address base0 ═ m in a first data window, and then the first data window allocates addresses to the data blocks and sequentially arranges the addresses in a base1 ═ m +1, a base2 ═ m +2, a base3 ═ m +3, a base4 ═ m +4 … … and a base i ═ m + i;
and the data sending module transmits the first data information to the data receiving terminal according to the address sequence of the data block.
Specifically, when receiving the second data information, a data receiving module arranged in the data receiving terminal is used for receiving the second data information and generating a first ACK message; the data receiving module is connected with the data caching module and used for sending the data of the received second data information to the data caching module; the data receiving module is connected with the second data window and used for sending the address information of the first ACK message and the second data message to the second data window;
the second data window sequences the address information of the second data information and judges the continuity of data transmission, and when the address information base (i-1) and base i of the second data information received by the second data window are null, the second data window judges that the address information base (i-1) and base i are first packet loss information;
and the second data window sends the first ACK message and the first packet loss information to a packet loss management module.
Determining data content contained in the first ACK message, if the first ACK message carries first packet loss information, the packet loss management module transmits the first ACK message and the first packet loss information back to an ACK sampling module of the sending terminal through an ACK protocol, and the ACK sampling module sends a first request for retransmission to a first data window; the ACK sampling module sends the first ACK message and the first packet loss information to a first data window, the first data window fills up corresponding data information of base (i-1) and base for address information of the first packet loss information and sends the data information to a data sending module, and the data sending module transmits the data information corresponding to the first packet loss information to a data receiving module.
Specifically, in the process of sending a first retransmission request by the data sending module, the data receiving module generates a second ACK message after receiving the arrival data information of the first packet loss information, the data receiving module sends the arrival data information of the first packet loss information to the data buffer and sends the second ACK message and the address information corresponding to the arrival data information of the first packet loss information to the second data window, the second data window sorts the address information corresponding to the arrival data information of the first packet loss information and judges the continuity of data transmission, and the second packet loss information is judged and sent to the packet loss manager;
the packet loss management module transmits the second ACK message and the second packet loss information back to an ACK sampling module of the sending terminal through an ACK protocol; the ACK sampling module determines data content contained in the second ACK message, and if the second ACK message carries second packet loss information, the ACK sampling module sends a second retransmission request to the first data window; the ACK sampling module sends a second ACK message and second packet loss information to the first data window, the first data window reads the second packet loss information, fills the corresponding data information and sends the data information to the data sending module, and the data sending module transmits the data information of the second packet loss information to the data receiving module;
in the process of sending the (n-1) th request retransmission by the data sending module, the data receiving module generates an n ACK message; and the ACK sampling module determines the data content contained in the nth ACK message, and if the nth ACK message does not carry the packet loss information, the data sending terminal judges that the first data information is successfully sent to the data receiving terminal.
The first data information is divided into data blocks through a first data window of a data sending end, address information is distributed to each data block, the address information of the second data information is sequenced through a second data window of a data receiving end, the continuity of data transmission is judged, packet loss information in the data transmission process can be determined, and the accuracy of data transmission is improved;
and determining the data content contained in the ACK message through an ACK sampling module, requesting retransmission when the ACK message carries the packet loss information, and judging that the first data information is successfully transmitted to the data receiving terminal by the data transmitting terminal when the ACK message does not carry the packet loss information, so that the data transmission is more accurate, and the data transmission quality is improved.
A congestion control module arranged in the data sending terminal is respectively connected with the ACK sampling module and the first data window, the congestion control module is used for monitoring and controlling whether the data volume of the packet loss information sent by the ACK sampling module is congested or not in real time, and when the congestion control module judges that the packet loss data transmission is congested, a congestion control mechanism is started;
after the congestion control module receives a plurality of address information, the congestion control module sorts the data volume of the corresponding difference information in the plurality of address information from small to large in sequence to form a data volume list;
setting a maximum packet loss information data amount DQm in a congestion control module, wherein the actual packet loss information data amount is DQi, and when the DQi is larger than or equal to the DQm, the congestion control module judges that the packet loss information amount is large and starts a congestion control mechanism to limit the current of packet loss information data transmission;
the congestion control module sorts packet loss information quantity carried by the ACK message from small to large, and the congestion control module preferentially selects a data packet with small packet loss information quantity to request retransmission;
and when the packet loss information quantity carried by the ACK message is the same, the congestion control module preferentially selects the data packet which is prolonged in time to request retransmission.
Whether the data volume of the packet loss information sent by the ACK sampling module is congested is monitored in real time through the congestion control module, the data volume of the packet loss information is sequenced from small to large in sequence, and the data packet with the small data volume of the packet loss information is preferentially selected to request for retransmission, so that the congestion in the data transmission process can be effectively controlled and relieved, and the data transmission time delay is reduced.
Specifically, the specific implementation manner of the timeout retransmission performed by the data transmission terminal in the first data transmission process is as follows:
a first clock module arranged in the data sending terminal records the time t1 when the data sending module sends the first data information, a second clock module is also arranged in the data receiving terminal, the second clock module records the time t2 when the data receiving module receives the second data information and generates the first ACK message, and the first transmission time of the first data information is delta t 1-t 2-t 1;
the second clock module records a time t3 of the second ACK message, and the second transmission time of the first data information is Δ t2, which is t3-t 2;
the nth transmission time of the first data information is delta tn + 1-tn;
setting the standard timeout retransmission time Tr0 in the first clock module, setting the interval time of each actual data transmission as Δ ti,
when delta ti is more than 0 and less than or equal to Tr0, the data transmitting terminal does not perform overtime retransmission;
and when the delta ti is larger than Tr0, the data sending terminal conducts overtime retransmission on the data information corresponding to the ith packet loss information.
The first clock module records the time when the data sending module sends the first data information, the second clock module records the time when the data receiving module receives the second data information and generates the first ACK information, whether data transmission is overtime or not can be judged through the time difference, an overtime request is sent out in time, and the stability of data transmission is improved.
Specifically, the specific implementation modes of the data sending terminal for judging the time delay, monitoring the time delay and controlling the time delay are as follows:
setting a standard time delay of a data sending terminal successfully sending first data information to a data receiving terminal in a first clock module as L0, wherein the actual time delay is Li, Li is Σ Δ ti, and i is 1,2,3 … … n;
when Li is more than 0 and less than or equal to L0, the data sending terminal judges that the data transmission delay of the first data information is normal, and the congestion control module does not start a congestion control mechanism;
when Li is larger than L0, the data sending terminal judges that the data transmission delay of the first data information is large, and then the congestion control mechanism is started and the delay is reduced.
The data transmission time delay is calculated through the first clock module, and when the data transmission terminal judges that the data transmission time delay of the first data information is large, the time delay is reduced by starting a congestion control mechanism, so that the waiting time of data transmission is shortened, and the data transmission efficiency is improved.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A reliable data transmission system based on a satellite network, comprising:
the data sending terminal is used for sending first data information outwards by adopting a UDP protocol;
the data receiving terminal is used for receiving second data information of the data sending terminal, and in the process of receiving the data information, if the data length of the second data information is different from that of the first data information, a packet loss management module arranged in the data receiving terminal is started, determines packet loss information and sends the packet loss information to the data sending terminal;
the packet loss information is a plurality of address information corresponding to the difference information of the first data information and the second data information;
a congestion control module is arranged in the data sending terminal, and after receiving a plurality of address information, the congestion control module sequences the data volume of corresponding difference information in the plurality of address information to form a data volume list;
and the data sending terminal sequentially transmits the corresponding difference information in the address information according to the sequence of the data volume list.
2. The reliable data transmission system based on the satellite network according to claim 1, wherein an ACK sampling module and a first clock module are further disposed in the data sending terminal, the ACK sampling module is connected to the congestion control module and is configured to receive an ACK message sent by the data receiving terminal, a retransmission timeout period is pre-set in the first clock module, after the data sending terminal receives the ACK message, a data content included in the ACK message is determined, and a response policy is determined according to the data content and the retransmission timeout period.
3. The system of claim 2, wherein the determining a response policy according to the data content and the retransmission timeout period comprises:
after the data sending terminal sends the first data information to the data receiving terminal, in a preset retransmission timeout period, the data sending terminal does not receive an ACK message sent by the data receiving terminal in a corresponding time, and then the data sending terminal sends timeout retransmission to the first data information;
after the data sending terminal sends the first data information to the data receiving terminal, the data sending terminal receives an ACK message sent by the data receiving terminal and the packet loss information carried by the ACK message, and then the data sending terminal sends a request for retransmission to the data information corresponding to the packet loss information.
4. The reliable data transmission system based on satellite network according to claim 3, wherein when transmitting the first data information, a first data window is further disposed in the data transmitting terminal, the first data window is configured to perform data division on the first data information, divide the first data information into a plurality of data blocks, and allocate address information to each of the data blocks;
setting a start data address base0 ═ m in the first data window, then the first data window allocates addresses to the data blocks, and sequentially base1 ═ m +1, base2 ═ m +2, base3 ═ m +3, base4 ═ m +4 … …, and base i ═ m + i;
and the data sending module transmits the first data information to the data receiving terminal according to the address sequence of the data block.
5. The reliable data transmission system based on satellite network according to claim 4, wherein when receiving the second data information, a data receiving module, a data buffer module and a second data window are further disposed in the data receiving terminal; wherein, the first and the second end of the pipe are connected with each other,
the data receiving module is used for receiving the second data information and generating a first ACK message; the data receiving module is connected with the data caching module and used for sending the data of the second data information to the data caching module; the data receiving module is connected with the second data window and used for sending the address information of the first ACK message and the second data message to the second data window;
the second data window sequences the address information of the second data information and judges the continuity of data transmission, and when the address information base (i-1) and base i of the second data information received by the second data window are null and null, the second data window judges that the address information base (i-1) and base i are first packet loss information;
and the second data window sends the first ACK message and the first packet loss information to the packet loss management module.
6. The reliable data transmission system based on the satellite network according to claim 5, wherein the data content included in the first ACK message is determined, and if the first ACK message carries the first packet loss information, the packet loss management module returns the first ACK message and the first packet loss information to the ACK sampling module of the sending terminal through an ACK protocol, and the ACK sampling module sends a first retransmission request to the first data window; the ACK sampling module sends the first ACK message and the first packet loss information to the first data window, the first data window fills up the corresponding data information of the first packet loss information, namely base (i-1) and base i, and sends the data information to the data sending module, and the data sending module transmits the data information corresponding to the first packet loss information to the data receiving module.
7. The reliable data transmission system based on the satellite network according to claim 6, wherein in a process of sending a first request for retransmission by the data sending module, the data receiving module generates a second ACK message after receiving the arrival data information of the first packet loss information, the data receiving module sends the arrival data information of the first packet loss information to the data buffer and sends the second ACK message and the address information corresponding to the arrival data information of the first packet loss information to the second data window, the second data window sorts the address information corresponding to the arrival data information of the first packet loss information and determines continuity of data transmission, and determines a second packet loss information and sends the second packet loss information to the packet loss manager;
the packet loss management module transmits the second ACK message and the second packet loss information back to an ACK sampling module of the sending terminal through an ACK protocol; the ACK sampling module determines data content contained in a second ACK message, and if the second ACK message carries second packet loss information, the ACK sampling module sends a second retransmission request to the first data window; the ACK sampling module sends the second ACK message and the second packet loss information to the first data window, the first data window reads the second packet loss information, fills the corresponding data information and sends the data information to the data sending module, and the data sending module transmits the data information of the second packet loss information to the data receiving module;
in the process that the data sending module sends out the (n-1) th request retransmission, the data receiving module generates an n ACK message; and the ACK sampling module determines the data content contained in the nth ACK message, and if the nth ACK message does not carry the packet loss information, the data sending terminal judges that the first data information is successfully sent to the data receiving terminal.
8. The reliable data transmission system based on the satellite network according to claim 7, wherein the congestion control module is connected to the ACK sampling module and the first data window, respectively, and is configured to monitor and control whether the data amount of the packet loss information sent by the ACK sampling module is congested in real time, and when the congestion control module determines that the packet loss data transmission is congested, start a congestion control mechanism;
after the congestion control module receives a plurality of pieces of address information, the congestion control module sorts the data volumes of the corresponding difference information in the plurality of pieces of address information from small to large in sequence to form a data volume list;
setting a maximum packet loss information data amount DQm in the congestion control module, wherein the actual packet loss information data amount is DQi, and when DQi is larger than or equal to DQm, the congestion control module judges that the packet loss information amount is large and starts a congestion control mechanism to limit the current of packet loss information data transmission;
the congestion control module sorts packet loss information quantity carried by the ACK message from small to large, and the congestion control module preferentially selects a data packet with small packet loss information quantity to request retransmission;
and when the packet loss information amount carried by the ACK message is the same, the congestion control module preferentially selects the data packet which is prolonged in time to request retransmission.
9. The reliable data transmission system based on satellite network as claimed in claim 8, wherein the first clock module records a time t1 when the data sending module sends the first data message, and a second clock module is further disposed in the data receiving terminal, and the second clock module records a time t2 when the data receiving module receives the second data message and generates the first ACK message, so that the first transmission time of the first data message is Δ t1 — t2-t 1;
the second clock module records a time t3 of the second ACK message, and then a second transmission time of the first data information is Δ t2-t 3-t 2;
the nth transmission time of the first data information is delta tn + 1-tn;
setting standard overtime retransmission time Tr0 in the first clock module, setting actual data transmission interval time at each time as delta ti,
when delta ti is more than 0 and less than or equal to Tr0, the data sending terminal does not perform overtime retransmission;
and when the delta ti is larger than Tr0, the data sending terminal conducts overtime retransmission on the data information corresponding to the ith packet loss information.
10. The system for reliable data transmission over a satellite network according to claim 9, wherein a standard time delay for the data sending terminal to successfully send the first data information to the data receiving terminal is set to L0, and an actual time delay is Li, then Li ═ Σ Δ ti, where i ═ 1,2,3 … … n;
when Li is more than 0 and less than or equal to L0, the data sending terminal judges that the data transmission delay of the first data information is normal, and the congestion control module does not start the congestion control mechanism;
and when Li is larger than L0, the data sending terminal judges that the data transmission delay of the first data information is large, and then the congestion control mechanism is started and the delay is reduced.
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