CN104618007B - A kind of synchronous satellite Transmission Control Protocol segmentation connection optimization method - Google Patents
A kind of synchronous satellite Transmission Control Protocol segmentation connection optimization method Download PDFInfo
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Abstract
The present invention relates to a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism.Satellite protocol gateway is set up respectively in transmitting terminal and receiving terminal both sides, and TCP connections are divided into transmitting terminal-terrestrial links-protocol gateway, protocol gateway-satellite link-protocol gateway, protocol gateway-terrestrial links-receiving terminal three parts.Wherein terrestrial links use TCP standard agreements, and satellite link uses exclusive Transmission Control Protocol.Exclusive Transmission Control Protocol is controlled using Transmission Control Protocol ACK deceptions, packet error, TCP connections optimization is realized in return link bandwidth control and transparent to terrestrial links Transmission Control Protocol.The present invention has taken into full account satellite link long delay, high bit-error and the asymmetric feature of channel width, setting up protocol gateway makes the exclusive Transmission Control Protocol of satellite link transparent to ground Transmission Control Protocol, reduce hardware modification cost, the bandwidth availability ratio of satellite communication system is improved, reduces adverse effect of the satellite link to Transmission Control Protocol.
Description
Technical field
The present invention relates to space communications technique field, more particularly to a kind of synchronous satellite Transmission Control Protocol segmentation connection optimization side
Method.
Background technology
Satellite communication refers to use satellite as relay station forwarding or reflection radio wave, in two or more earths
Communicated between standing.There is following advantage by the use of satellite communication as relay transmission media：The wave cover of satellite communication
Scope is wide, and communication distance is remote；Communication performance is stable, reliable；System Construction is rapid, easy.
Internet technology and related industry are currently under the situation of fast development, with the drastically increasing of terminal user's quantity
Add, emerging service continues to bring out, and the rapid expansion of Internet industry coverage, the development of Internet technology and industry
It is faced with new opportunities and challenges.
Wide variety of Transmission Control Protocol (the Transmission Control Protocol in Internet data transmission technology
Transmission control protocol), it is connection-oriented transport layer protocol, reliable, stable data transfer is provided to upper layer application.In satellite
Can solve the problems, such as to run into during existing internet development using Transmission Control Protocol in communication system, while reduce user ground
Stand the soft and hardware improvement cost of access, make satellite communication system and GCS Ground Communication System that there is preferably compatibility.Therefore utilize
Satellite communication system carrying Internet technology has very big advantage, but designs and realize satellite-based internetworking technologies
Face many challenges, wherein it is main the problem of be exactly Transmission Control Protocol application problem.The design original intention of Transmission Control Protocol is in wired letter
Stable, reliable service is provided on road, and satellite channel has long delay (synchronous satellite round-trip delay about 500ms), high bit error
Rate (about 10-3) and the characteristic such as channel asymmetric (downlink bandwidth is much larger than upstream bandwidth), defended if Transmission Control Protocol directly applied to
Star communicates, it will the largely performance of restricted T CP agreements.
The content of the invention
For drawbacks described above present in prior art, the present invention proposes a kind of synchronous satellite based on splitting TCP mechanism
TCP protocol optimization method, to improve the performance of Transmission Control Protocol in satellite communication system.
A kind of synchronous satellite Transmission Control Protocol segmentation connection optimization method, is specifically included：
S1, synchronous satellite communications system transmitting terminal-transmission gateway, send gateway-reception gateway, reception gateway-connect
TCP connections are established using three-way handshake mechanism respectively between receiving end；
S2, after establishing TCP connections, terrestrial links part (transmitting terminal-transmission gateway, receive gateway-receiving terminal) uses
Standard TCP protocol transmits data.The protocol gateway of satellite link part (send gateway-reception gateway) is to the data that receive
Message is handled and is based on the exclusive Transmission Control Protocol of satellite link and carried out data transmission and receive；
After S3, the data transfer ends, the three parts for having established TCP connections described in step S1 discharge TCP connections respectively, etc.
Treat that transmitting terminal sends TCP connection requests next time.
Further, the TCP connections are established, transmission and release stage, satellite relay transponder use transparent forwarding
Mode, to save resource on star.
Further, different physical links are divided into difference by synchronous satellite communications system for communication channel parameters difference
Span line, including transmitting terminal-transmission gateway, send gateway-satellite relay forward-receive gateway, receive gateway-reception
Hold three parts.
Further, the three-way handshake is established the TCP stages, is sent gateway, satellite relay forwarding, is received gateway to message
Data are not dealt with, by the way of transparent forwarding message, with the stability of enhancing connection.
Further, the data message received is removed into head in protocol gateway, plus satellite link TCP specific protocols
Header, it is therefore an objective to compress head, improve the efficiency of transmission of packet over the satellite link.
Further, data buffer area is set up in the protocol gateway, the TCP data bag of transmitting terminal or receiving terminal is stored
Into buffer area, it is ensured that data retain copy before unconfirmed, in case retransmitting.
Further, the exclusive Transmission Control Protocol of satellite link is special for satellite link long delay, high bit-error and asymmetric bandwidth
Property make significantly Optimal improvements, including deception ACK, packet error control, return link bandwidth control etc..
Further, the ACK deceptions mode includes：In view of in some cycles T, it is believed that satellite channel parameter
Keep constant.In certain time cycle T, transmitting terminal protocol gateway is after data message is received, to receiving terminal protocol gateway
Channel detection message is sent, it is good to receive the provable channel status of feedback in the given time, then sends ACK letters to transmitting terminal
Number, while transmitting terminal protocol gateway directly sends ACK confirmation letters after data message is received to transmission end main frame in cycle T
Breath, to improve efficiency of transmission；If do not receive feedback information in the given time, then it is assumed that present satellites channel status is bad, should
Slow down the transmission of TCP data message, avoid further degraded channel.
Further, the satellite link is one hop link between hair receives both ends, congestion is not present in link, therefore data exist
It must be transmitted in order on satellite link, will not be out-of-sequence.
Further, it negates retransmission mechanism that the packet error control method, which includes satellite protocol gateway to provide a kind of,
(NACK), if be spaced between receiving the packet packet number that protocol gateway receives, it can be assumed that the loss of packet
It is to be triggered by error code rather than congestion, NACK, the message that request retransmission is lost can be sent immediately by receiving protocol gateway.
Further, the return link bandwidth control, which is included in, receives a kind of timing affirmation mechanism of protocol gateway design,
The ACK messages of oneself are sent to transmission protocol gateway after receiving protocol gateway and receiving a number of ACK messages, make transmission
Gateway, which is removed, has confirmed that packet, release caching.Reduce retrograde satellite link ACK message rates.
Further, the TCP transmission end of data release access phase, gateway, satellite relay forwarding is sent, receives net
Pass is not dealt with to message data, by the way of transparent forwarding, with the stability of enhancing connection, it is ensured that connection release in time.
Compared with prior art, the present invention has advantages below：
The invention provides a kind of synchronous satellite Transmission Control Protocol to be segmented connection optimization method, by satellite reception end, transmission
End both sides earth station sets up protocol gateway, and Transmission Control Protocol is segmented and connected, and ground sending and receiving end is assisted with protocol gateway using ground TCP
View is communicated, and is communicated between protocol gateway using the exclusive Transmission Control Protocol of satellite link.Exclusive Transmission Control Protocol is assisted using class UDP
The message format of (User Datagram Protocol, User Datagram Protocol) is discussed, to improve communication data in finite bandwidth
Satellite link in efficiency of transmission.Meanwhile exclusive Transmission Control Protocol is directed to satellite link long delay, high bit-error and asymmetric band
Wide characteristic makes Optimal improvements, including：Cheat ACK, packet error control, return link bandwidth control.TCP establishment of connections
Packet is not modified with release stage protocol gateway, takes the mode of transparent forwarding to strengthen connective stability；For section
Resource on star is saved, satellite relay whole process is by the way of transparent forwarding.Therefore, Transmission Control Protocol segmentation connection provided by the invention is excellent
Communication link is divided into terrestrial links and satellite link two parts by change method by setting up protocol gateway in transmitting-receiving two-end, and is directed to
Satellite link characteristic carries out that optimization is greatly improved to Transmission Control Protocol, while satellite channel state is considered in data transmission procedure,
Reduce the bit error rate for the data that user receives, comprehensive lifting satellite communication system communication quality, lifting system performance.
Brief description of the drawings
Fig. 1 is the flow chart of the method for the invention；
Fig. 2 is satellite Transmission Control Protocol gateway protocol structural representation of the present invention；
Fig. 3 is deception ACK mode schematic flow sheets of the present invention；
Fig. 4 is return link bandwidth control structure schematic diagram of the present invention；
Fig. 5 is the synchronous satellite Transmission Control Protocol segmentation connection optimization system scenarios schematic diagram in the embodiment of the present invention.
Embodiment
The embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.Following examples are used to illustrate
The present invention, but it is not limited to the scope of the present invention.
Synchronous satellite Transmission Control Protocol segmentation connection optimization method of the present invention, steps flow chart is as shown in figure 1, specifically include
Following steps：
Step S1, the transmitting terminal of synchronous satellite communications system-transmission gateway, gateway-reception gateway is sent, receives net
TCP connections are established using three-way handshake mechanism respectively between pass-receiving terminal.Satellite Transmission Control Protocol gateway protocol structural representation is such as
Shown in Fig. 2.
Step S2, after establishing TCP connections, terrestrial links part (transmitting terminal-transmission gateway, receives gateway-receiving terminal)
Data are transmitted using standard TCP protocol.The protocol gateway of satellite link part (send gateway-reception gateway) is to receiving
Data message is handled and is based on the exclusive Transmission Control Protocol of satellite link and carried out data transmission and receive.
Step S3, after the data transfer ends, the three parts for having established TCP connections described in step S1 discharge TCP companies respectively
Connect, transmitting terminal sends TCP connection requests next time for wait.
By above-mentioned steps, ground sending and receiving end is communicated with protocol gateway using ground standard Transmission Control Protocol, protocol gateway
Between communicated using the exclusive Transmission Control Protocol of satellite link.Exclusive Transmission Control Protocol uses the message format of class udp protocol, to improve
Efficiency of transmission of the communication data in the satellite link of finite bandwidth.Meanwhile exclusive Transmission Control Protocol for satellite link long delay,
High bit-error and asymmetric bandwidth characteristic make Optimal improvements, including：Cheat ACK, packet error control, return link bandwidth
Control.TCP establishment of connections and release stage protocol gateway are not modified to packet, take the mode of transparent forwarding to increase
Strong ties stability；To save resource on star, satellite relay whole process is by the way of transparent forwarding.Therefore, it is provided by the invention
Communication link is divided into terrestrial links and satellite by Transmission Control Protocol segmentation connection optimization method by setting up protocol gateway in transmitting-receiving two-end
Link two parts, and Transmission Control Protocol is carried out optimization is greatly improved for satellite link characteristic, while in data transmission procedure
Consider satellite channel state, reduce the bit error rate for the data that user receives, comprehensive lifting satellite communication system communication quality, carry
Rise systematic function.
Preferably due to ground hair receiving end communicate with earth station protocol gateway respectively, not directly with satellite relay forwarding
Contact, makes satellite relay transparent to ground sending and receiving end, reduces terrestrial links improvement cost, while using special between protocol gateway
Belong to Transmission Control Protocol communication, can further improve efficiency of transmission.
The exclusive Transmission Control Protocol of satellite link is exactly after current channel conditions are detected by probe messages, by starting
Protocol gateway is compressed to data header, to improve the efficiency of transmission of data message on satellite link, while according to defending
Star channel conditions adjust data-message transmission mode, correct to distinguish the reason for losing data message, can avoid further deteriorating
Channel, improve system bandwidth utilization rate.
The exclusive Transmission Control Protocol of satellite link also includes：Cheat ACK, packet error control, return link bandwidth control etc..
It is as shown in Figure 3 to cheat ACK mode schematic flow sheets.ACK deceptions mode includes：In certain time cycle T, send
Protocol gateway is held after data message is received, channel detection message is sent to receiving terminal protocol gateway, receives in the given time
To feeding back, provable channel status is good, then sends ack signal to transmitting terminal, while transmitting terminal protocol gateway exists in cycle T
ACK confirmations directly are sent to transmission end main frame after receiving data message, to improve efficiency of transmission；If in the given time
Feedback information is not received, then it is assumed that present satellites channel status is bad, should slow down the transmission of TCP data message, avoids further
Degraded channel.
This method Satellite link is one hop link, is not present congestion in link, and data message must be according on link
Sequential delivery, will not be out-of-sequence.Protocol gateway proposes a kind of negative re-transmission machine in packet error control method under this condition
System, if be spaced between receiving the packet packet number that protocol gateway receives, receiving protocol gateway can send immediately
NACK, the message that request retransmission is lost.
Return link bandwidth control structure schematic diagram is as shown in Figure 4.Return link bandwidth control includes：Receiving agreement net
Close and design a kind of timing affirmation mechanism, to transmission protocol gateway after receiving protocol gateway and receiving a number of ACK messages
The ACK messages of oneself are sent, transmission gateway is removed and has confirmed that packet, release caching.Reduce retrograde satellite link ACK messages
Speed.Reduce influence of the asymmetric bandwidth to Transmission Control Protocol, there is provided data transmission efficiency.
One embodiment of the present of invention is given below.
A kind of synchronous satellite Transmission Control Protocol segmentation connection optimization system is present embodiments provided, the scene composition of the system shows
Be intended to as shown in figure 5, including：Transmitting terminal, transmitting terminal protocol gateway, satellite relay, receiving terminal protocol gateway and receiving terminal.
When transmitting terminal needs to be communicated by satellite with receiving terminal, agreement net is set up respectively in transmitting terminal and receiving terminal
Close.The transmitting terminal of synchronous satellite communications system-transmission gateway, send gateway-reception gateway, receive gateway-receiving terminal between
Using the TCP connections of three-way handshake Mechanism establishing.Send gateway and use transparent forwarding mode to being connected data with receiving gateway, do not enter
Row data processing, with the stability of enhancing connection.This implementation column sets the cycle as N, detection cycle t.After the cycle is entered,
Transmitting terminal protocol gateway sends ACK detectable signals, if receiving ack signal in detection cycle t, then it is assumed that in cycle N
Channel circumstance is good.Transmitting terminal sends datagram, and transmitting terminal protocol gateway sends ack signal, makes N=N-1.If in the time
ACK answer signals are not received in t, then slows down originator transmission rate and is sent datagram into slow turn-on mode, and N=N-1.
After having sent a data message, receiving terminal detection receives whether grouped data Bale No. is spaced.If without interval,
Next data message is sent in a manner described in a manner of cheating ACK until N=0.If there is interval, then NACK is sent,
Retransmit and lose message.As N=0, the end cycle, receiving end protocol gateway is sent from plan ACK messages to originator protocol gateway, and
Whether detection data transfer terminates.If it has not ended, then continue data transfer by said process into next cycle.
Transmitting-receiving two-end discharges TCP connections if the data transfer ends, terminates data transmission procedure.
A kind of synchronous satellite Transmission Control Protocol segmentation connection optimization method is present embodiments provided, by satellite reception end, hair
Sending end both sides earth station sets up protocol gateway, and Transmission Control Protocol is segmented and connected, and ground sending and receiving end uses ground TCP with protocol gateway
Agreement is communicated, and is communicated between protocol gateway using the exclusive Transmission Control Protocol of satellite link.Exclusive Transmission Control Protocol uses class UDP
The message format of agreement (User Datagram Protocol, User Datagram Protocol), to improve communication data in limited band
Efficiency of transmission in wide satellite link.Meanwhile exclusive Transmission Control Protocol is directed to satellite link long delay, high bit-error and asymmetry
Bandwidth characteristic makes Optimal improvements, including：Cheat ACK, packet error control, return link bandwidth control.TCP connections are built
Vertical and release stage protocol gateway is not modified to packet, takes the mode of transparent forwarding to strengthen connective stability；For
Resource on star is saved, satellite relay whole process is by the way of transparent forwarding.Therefore, Transmission Control Protocol segmentation connection provided by the invention
Communication link is divided into terrestrial links and satellite link two parts, and pin by optimization method by setting up protocol gateway in transmitting-receiving two-end
Satellite link characteristic is carried out to Transmission Control Protocol optimization is greatly improved, while satellite channel shape is considered in data transmission procedure
State, reduce the bit error rate for the data that user receives, comprehensive lifting satellite communication system communication quality, lifting system performance.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, about the common of technical field
Technical staff, without departing from the spirit and scope of the present invention, it can also make a variety of changes and modification, thus it is all
Equivalent technical scheme falls within scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (9)
- A kind of 1. synchronous satellite TCP protocol optimization method based on splitting TCP mechanism, it is characterised in that methods described is specifically wrapped Include：S1, synchronous satellite communications system transmitting terminal-transmission gateway, gateway-reception gateway is sent, receive gateway-receiving terminal Between TCP connections are established using three-way handshake mechanism respectively；S2, after establishing TCP connections, transmitting terminal-transmission gateway of terrestrial links part, receive gateway-receiving terminal and use standard Transmission Control Protocol transmits data；The protocol gateway that satellite link part sends gateway-reception gateway enters to the data message received Row processing, and data are carried out based on the exclusive Transmission Control Protocol of satellite link and sends and receives；Wherein, the exclusive Transmission Control Protocol of the satellite link includes deception ACK, and the deception ACK methods include：In some cycles T Think satellite channel parameters constant；After establishing TCP connections, originator protocol gateway sends detection report to receiving end protocol gateway Text；If originator protocol gateway receives feedback acknowledgment message within the default time limit, it is believed that satellite channel is good within the cycle, fits Preferably send TCP data message；In cycle T, after satellite originator protocol gateway receives the packet of transmitting terminal transmission, directly to hair Sending end sends ACK confirmations；Transmitting terminal is after ACK confirmations are received, it is believed that the packet sent before, which has arrived at, to be connect Receiving end main frame, continue to send data；After S3, the data transfer ends, the three parts release TCP connections of TCP connections are established described in step S1, wait is sent out next time Sending end sends TCP connection requests.
- 2. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 1, its feature It is, the TCP connections establishment stage, sends gateway with receiving gateway and use transparent forwarding mode to being connected data, do not enter Row data processing, with the stability of enhancing connection；Satellite relay whole process is by the way of transparent forwarding, to save resource on star.
- 3. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 1, its feature It is, the protocol gateway for sending gateway-reception gateway is managed including data buffer area the process of data processing, is removed Standard TCP protocol data packet messages head, plus the exclusive Transmission Control Protocol data packet messages head of satellite link, carried with compressing head The efficiency of transmission of high packet over the satellite link.
- 4. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 3, its feature It is, data buffer area is set up in the protocol gateway of the transmission gateway-reception gateway, by transmitting terminal or the TCP numbers of receiving terminal According to bag storage into buffer area, it is ensured that data retain copy before unconfirmed, in case retransmitting.
- 5. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 1, its feature It is, the exclusive Transmission Control Protocol of satellite link includes：Packet error controls and return link bandwidth control.
- 6. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 1, its feature It is, the deception ACK methods include：Into after the cycle T, if originator protocol gateway does not receive instead within the default time limit Confirmation message is presented, using standard TCP acknowledgment mechanism, originator protocol gateway sends next data after often receiving an ack signal Message.
- 7. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 5, its feature It is, the packet error control method includes：Satellite protocol gateway provides a kind of negative retransmission mechanism NACK, data transmit-receive There was only a satellite link between end, transmission of the packet on link will not be out-of-sequence；If receive the number that protocol gateway receives It is spaced according between bag packet number, the loss for illustrating packet is triggered by error code rather than congestion, receives protocol gateway NACK, the message that request retransmission is lost are sent immediately.
- 8. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 5, its feature It is, the return link bandwidth control method includes：A kind of timing affirmation mechanism is designed receiving protocol gateway, is assisted receiving After view gateway receives a number of ACK messages, to the ACK sent under the protocol gateway transmission exclusive Transmission Control Protocol of satellite link Message, remove transmission gateway and have confirmed that packet, release caching.
- 9. a kind of synchronous satellite TCP protocol optimization method based on splitting TCP mechanism according to claim 1, its feature It is, the release of TCP connections described in step S3 uses standard mode, sends gateway with receiving gateway and uses transparent forwarding to data Mode, without any data processing.
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| CN105245271B (en) * | 2015-10-27 | 2019-12-13 | 航天恒星科技有限公司 | Satellite communication network acceleration device and method |
| WO2017185368A1 (en) * | 2016-04-29 | 2017-11-02 | 华为技术有限公司 | Signalling transmission method and device |
| CN106603202A (en) * | 2016-11-24 | 2017-04-26 | 武汉船舶通信研究所 | Satellite link transmission method, system and gateway |
| CN114827004B (en) * | 2022-04-28 | 2023-12-29 | 中国电子科技集团公司第五十四研究所 | RIP protocol optimization method suitable for on-board IP route switching |
| CN116248172B (en) * | 2023-05-08 | 2023-07-07 | 银河航天(北京)网络技术有限公司 | Data transmission method, device and storage medium based on TCP/IP protocol and CCSDS protocol |
| CN117081640B (en) * | 2023-07-10 | 2024-04-09 | 武汉船舶通信研究所(中国船舶集团有限公司第七二二研究所) | Multi-protocol star warship-ground integrated gateway design method based on frame header compression |
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