CN101494652A - Method for reinforcing TCP protocol performance in satellite communication system - Google Patents
Method for reinforcing TCP protocol performance in satellite communication system Download PDFInfo
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Abstract
The invention discloses a method of enhancing performance of TCP protocol in a satellite communication system, which relates to a technology of satellite communication service accessing to enhance the performance of TCP protocol in the field of satellite communications. The method includes: two Gateway respectively performing cheating response to the client TCP data terminal to increase the TCP sending rate; real-time ensuring of the bandwidth allocation fairness and effectiveness based on TCP connection number and the actual flow of each connection; according to the chain circuit shelter problem, using the number of the confirmation data packs from object terminal host to judge whether shelter takes place, adopting a method of pausing source host sending and fast retransmission of cache data to ensure that the data continue regular transmission after the chain circuit is newly switched on. The present invention is fully compatible with TCP protocol; has advantages of high channel utilization, strong channel adaptability, high reliability, and so on; and is particularly suitable for using TCP / IP protocol to realize the use of satellite communication stations for realizing service access.
Description
Technical field
The present invention relates to strengthen in a kind of satellite communication system in the satellite communication field method of Transmission Control Protocol performance, be particularly suitable for utilizing ICP/IP protocol to realize that the satellite communication station of service access uses.
Background technology
Utilize ICP/IP protocol to carry out the main flow that transfer of data becomes network application already, the wide coverage of satellite communication, good broadcast-capable and the advantage that not limited by various regional conditions make satellite communication will play a significant role in future.Satellite communication will be the important means of wireless Internet, and utilizing satellite to carry out TCP/IP transfer of data (satellite IP-based network network) becomes the focus that people pay close attention to especially.
Transmission Control Protocol uses flow and the congested control mode based on sliding window, implement control (recipient's window notice) by confirming stream of packets, use comes tuning repeating transmission overtime based on the self-adaptation clock of the timer (RTT:round-trip timer) of two-way time, for avoiding the congested strategy that is called " starting slowly " that adopted.At the ground network design, its application at ground network has obtained great success to Transmission Control Protocol, but also has many problems to be solved that has in the application in space communication field specially.
The transmission of ground network is several to dozens of milliseconds two-way time, and be 80ms typical two-way time.The propagation delay of satellite channel is then much bigger, and particularly in the GEO system, be more than 6 times of ground network two-way time between 480-560ms.Big like this time-delay makes the TCP congestion window growth rate of slow starting state become very slow.In the document transmission process, the time of slow starting state cost is long more, and the transmission time of file is just long more; Ratio startup stage of slow in whole file transfer is big more, and then the effective bandwidth utilance of channel is just low more.As several KB of transmission during to the file (as web page browsing) of tens KB, because the transmission of whole file all is in the slow starting state of TCP, so TCP can't operate efficiently, the effective bandwidth utilance is very low.
In addition, the maximum throughput of TCP also is subjected to the restriction of two-way time and maximum send window, can be calculated by following formula:
Maximum throughput=maximum send window/two-way time
The maximum send window of standard TCP host-host protocol is set at 64KB, like this, is about in the GEO system of 500ms in two-way time, and the maximum throughput of Transmission Control Protocol can not surpass 1Mb/s.The needs that this obviously can not satisfy the high-speed multimedia business can not make full use of the satellite channel of big bandwidth.Even the method for the increase send window of current proposition also can only be accomplished to improve maximum efficiency of transmission and can not thoroughly be solved the problem of transmission rate restriction.
Satellite channel belongs to wireless channel, and under common GEO communication environment, satellite channel mainly presents Gauss's additive white noise feature, and error code is based on scattered random error, and the error rate is 10
-4-10
-6Scope in.And the quality of satellite channel also directly is subjected to the influence of weather.The error rate of (sleety weather etc.) channel also can be bigger when the weather worsening condition, even can not communicate by letter normally.When causing the tcp data packet loss owing to error code, Transmission Control Protocol thinks that network is in congestion state.Like this, transmission rate be will reduce and Congestion Avoidance or slow starting state entered into simultaneously.This has not only reduced the efficiency of transmission of TCP, but also has wasted the available bandwidth of satellite channel.
Owing to be subjected to the influence of Doppler frequency shift and multipath, satellite channel presents Lai Si or Rayleigh channel feature under MEO and LEO communication environment.Random error is so not only arranged, but also error burst can occur, make that the performance of Transmission Control Protocol is lower.
In order to overcome above-mentioned adverse effect, must adopt the Transmission Control Protocol performance enhancement techniques.
Present Transmission Control Protocol performance enhancement techniques mainly is divided into two classes: one, at the characteristics of satellite channel, Transmission Control Protocol itself is made amendment or expanded, though this method can be dealt with problems well, but require to change the protocol stack of all subscriber terminal equipments, obviously inadvisable; They are two years old, adopt the mode of protocol conversion that Transmission Control Protocol is converted to another kind of agreement on satellite link, thereby strengthen the TCP transmission performance, developed this kind equipment at present abroad, but this method requires transmitting-receiving two-end must all want the configuration protocol conversion equipment, have certain limitation during application, and this kind equipment is lower in the data transmission efficiency that satellite link blocks under the condition repeatedly, can not well supports " communication in moving " type ground satellite station.
Summary of the invention
The objective of the invention is to avoid the weak point in the above-mentioned background technology and provide TCP in a kind of satellite communication system to connect that bandwidth can be distributed automatically, satellite link blocks the method that guarantees the enhancing Transmission Control Protocol performance of tcp data high-efficiency transfer under the condition repeatedly.The present invention also has characteristics such as channel utilization height, channel adaptability are strong, reliability height.
The object of the present invention is achieved like this, the present invention includes step:
1. connect and set up
Satellite transmission station TCP performance strengthen TCP that Gateway1 receives that TCP client 2 is sent connect set up request data package after, transmit to Satellite Receiving Station TCP server 4,
After Satellite Receiving Station TCP performance enhancing Gateway3 receives that request data package is set up in connection, transmit, set up source IP address, source port, purpose IP address, the destination interface of request data package according to connection and set up TCP connection tracking record to TCP server 4,
Gateway3 receives the reply data bag that TCP server 4 sends, and transmits to TCP client 2, upgrades TCP connection tracking record,
Gateway1 receives the reply data bag that TCP server 4 sends, transmit to TCP client 2, set up TCP connection tracking record according to reply data bag source IP address, source port, purpose IP address, destination interface, and according to current TCP link bandwidth, TCP connection sum, TCP server 4 receive windows size establishment Protocol Spoofing Based timer and overtime retransmission timer
Gateway1 receives the reply data bag of TCP client 2, transmits to TCP server 4, upgrades TCP connection tracking record,
Gateway3 receives from connecting sum, TCP server 4 receive windows size establishment Protocol Spoofing Based timer and overtime retransmission timer according to current TCP link bandwidth, TCP behind the reply data bag of TCP client 2;
2. transfer of data
Gateway1 preserves and packet is transmitted to TCP server 4 after receiving the packet that TCP client 2 sends,
Gateway1 Protocol Spoofing Based timer pretends to be TCP server 4 regularly to send deception reply data bag to TCP client 2, and TCP client 2 is received deception reply data bag, continue to send packet to TCP server 4,
After Gateway3 receives the reply data bag of TCP server 4 transmissions, be connected sum with TCP according to reverse TCP link bandwidth and whether enable the control of acknowledgement back packet rate, if do not carry out the control of acknowledgement back packet rate, then this reply data bag is transmitted, otherwise the acknowledgement back packet is filtered
Gateway1 judges after receiving the reply data bag, if new reply data bag, then the packet that this reply data bag was confirmed is deleted from buffer memory; If the reply data bag that repeats, just judge whether current TCP connection has enabled the selectivity retransmission mechanism, if enable, then the packet of bust this is retransmitted, the packet of transmission success does not retransmit, if not enabled is then retransmitted the sequence number minimal data bag that is not identified in the buffer memory
If Gateway1 surpasses the re-transmission time and do not receive the reply data bag yet, the data re-transmission timer can be retransmitted the packet in the buffer memory,
In Gateway1 and the Gateway3 data transmission procedure TCP link bandwidth is distributed, and occur blocking in the transmission course and carry out retransmission process;
3. connect and remove
Gateway1 transmits to TCP server 4 after receiving that packet is removed in the connection of TCP client 2 transmissions,
Gateway3 transmits to TCP client 2 after receiving that packet is removed in the connection of TCP server 4 transmissions,
Gateway1 transmits to TCP client 2 after receiving that TCP server 4 is removed the reply data bag, this TCP connection tracking record of deletion and corresponding deception timer and the data re-transmission timer of deletion in TCP connection tracking record,
Gateway3 transmits to TCP server 4 after receiving that TCP client 2 is removed the reply data bag, this TCP connection tracking record of deletion and corresponding deception timer and the data re-transmission timer of deletion in TCP connection tracking record;
Finish and strengthen the Transmission Control Protocol performance in the satellite communication system.
The method that 2. the present invention the distributes the TCP link bandwidth in the Gateway1 described in the step and the Gateway3 data transmission procedure comprises step:
Satellite TCP link bandwidth is set a thresholding speed,
Is that low discharge connects with actual speed rate less than the TCP linkage flag of thresholding speed, is that big flow connects with actual speed rate greater than the TCP linkage flag of thresholding speed,
All low discharges are connected, connect actual speed rate according to low discharge and distribute bandwidth, connect to all big flows the remaining bandwidth mean allocation.
2. the present invention the method for carrying out retransmission process occurs blocking in the Gateway1 described in the step and the Gateway3 data transmission procedure, comprises step:
The reply data bag sum that Gateway1 receives current time compares with last second sum constantly, if the sum of the reply data bag that current time is received equate with the sum in the last second moment, judge that then channel has taken place to block,
Gateway1 is zero reply data bag to TCP client 2 send windows, TCP client 2 suspended sent data,
Gateway1 retransmits cached data packet to TCP server 4 repeatedly with the normal speed before blocking, and is 0 up to the cached data packet number,
Gateway1 sends normal deception reply data bag to TCP client 2, makes TCP client 2 restart to send data.
The present invention compares with background technology and has the following advantages:
1. the present invention replys the transmission rate that improves tcp data by the tcp data terminal is cheated, and has overcome satellite link long delay, high bit error to the Transmission Control Protocol Effect on Performance.
2. the present invention adjusts the bandwidth that every TCP connects in real time according to the actual flow of TCP number of connection and each connection, has guaranteed the fairness and the validity of satellite link allocated bandwidth.
3. the present invention is directed to the peculiar link occlusion issue of " communication in moving " type ground satellite station, be used to judge from destination host acknowledgement quantity of data packets whether link blocks, and adopt time-out source end main frame to send, retransmit fast data cached method and guarantee that link recloses the back data and continues normal transmission, solved the problem that satellite link blocks tcp data high-efficiency transfer under the condition repeatedly.
4. the complete compatible Transmission Control Protocol of the present invention has the TCP terminal now and needn't revise fully, and can single-ended configuration use.Also have channel utilization height, strong, the reliability advantages of higher of channel adaptability.
Description of drawings
Fig. 1 is that embodiment of the invention electricity principle is used schematic diagram.1 is Gateway (gateway) among Fig. 1, and 2 is the TCP client, and 3 is Gateway (gateway), and 4 is the TCP server.
Fig. 2 is Gateway1 of the present invention or Gateway3 link occlusion detection flow chart.
Embodiment
Referring to figs. 1 through Fig. 4, Fig. 1 is that embodiment of the invention electricity principle is used schematic diagram, and it comprises Gateway1 (gateway), TCP client 2, Gateway3 (gateway), TCP server 4.Gateway1 (gateway) or Gateway3 (gateway) effect are to carry out the Transmission Control Protocol enhancement process, and 2 effects of TCP client are to realize Transmission Control Protocol client protocol processing capacity, and TCP server 4 is to realize Transmission Control Protocol server-side protocol processing capacity.
The present invention includes step:
1. connect and set up
Satellite transmission station TCP performance strengthen TCP that Gateway1 receives that TCP client 2 is sent connect set up request data package after, transmit to Satellite Receiving Station TCP server 4.
After Satellite Receiving Station TCP performance enhancing Gateway3 receives that request data package is set up in connection, transmit, set up source IP address, source port, purpose IP address, the destination interface of request data package according to connection and set up TCP connection tracking record to TCP server 4.
Gateway3 receives the reply data bag that TCP server 4 sends, and transmits to TCP client 2, upgrades TCP connection tracking record.
Gateway1 receives the reply data bag that TCP server 4 sends, transmit to TCP client 2, set up TCP connection tracking record according to reply data bag source IP address, source port, purpose IP address, destination interface, and connect sum, TCP server 4 receive windows size establishment Protocol Spoofing Based timer and overtime retransmission timer according to current TCP link bandwidth, TCP.
Gateway1 receives the reply data bag of TCP client 2, transmits to TCP server 4, upgrades TCP connection tracking record.
Gateway3 receives from connecting sum, TCP server 4 receive windows size establishment Protocol Spoofing Based timer and overtime retransmission timer according to current TCP link bandwidth, TCP behind the reply data bag of TCP client 2.
Embodiment Gateway1 is from the packet of network intercepting and capturing from the TCP client, check purpose IP address information wherein, if purpose IP is Gateway1 itself, just directly transmit this packet, if not, just check that whether this packet is the tcp data bag, if not the tcp data bag, then directly transmits it.If this packet is the tcp data bag, so, just judge whether the SYN sign of this packet is 1, if be 1, illustrate that this packet is that request data package is set up in the TCP connection, then carries out TCP and connects the foundation processing.
Gateway1 receives the SYN packet from the TCP client, just in TCP connection tracking record sheet, add the new relevant information that connects, mainly comprise parameters such as destination address, destination interface, source address, source port, packet sequence number, and the role that will connect (role) is designated CLIENT, phase (state) is designated SYN_SEND, transmits this bag to TCP server 4 then.
Gateway3 receives the SYN packet from Gateway1, in TCP connection tracking record sheet, add the new relevant information that connects, mainly comprise parameters such as destination address, destination interface, source address, source port, packet sequence number, and the role that will connect is designated SERVER, phase is designated SYN_RECV, transmits this bag to TCP server 4 then.
If what receive is the SYN+ACK packet, but, so, just transmit this bag by there not being the record of this connection in the INFORMATION DISCOVERY TCP connection tracking record sheets such as contrast destination address, destination interface, source address, source port.
If what receive is the SYN+ACK packet, and by there being the record of this connection in the INFORMATION DISCOVERY TCP connection tracking record sheets such as contrast destination address, destination interface, source address, source port, so just judge further that this packet is from the LAN mouth, still from the WAN mouth.If this packet from the WAN mouth, just upgrades in the TCP connection tracking record sheet information about this connection, and makes phase=SYNACK_RECV; If this packet from the LAN mouth, just upgrades in the TCP tracking table record information about this connection, and phase is set equals SYN_SEND.Transmit this packet then.
If SYN is masked as 0 in the packet of receiving, and, so, just transmit this bag by there not being the record of this connection in the INFORMATION DISCOVERY TCP connection tracking record sheets such as contrast destination address, destination interface, source address, source port.
If SYN is masked as 0 in the packet of receiving, there is the record of this connection in the TCP connection tracking record sheet, and satisfies following three conditions:
(1) ACK is masked as 1;
(2) role equals CLIENT;
(3) phase equals SYNACK_RECV;
So, just upgrade the relevant information of this connection in the TCP connection tracking record sheet, and make phase equal CONNECTED, the deception timer of this connection is installed then, adjust the deception timer of other connection, the overtime retransmission timer of this connection is installed, transmit this bag at last.
If SYN is masked as 0 in the packet of receiving, there is the record of this connection in the TCP connection tracking record sheet, and satisfies following three conditions:
(1) ACK is masked as 1;
(2) role equals SERVER;
(3) phase equals SYN_SEND;
So, just upgrade the relevant information of this connection in the TCP connection tracking record sheet, and phase is set equals CONNECTED, the deception timer of this connection is installed then, adjust the deception timer of other connection, the overtime retransmission timer of this connection is installed, transmit this bag at last.
2. transfer of data
Gateway1 preserves and packet is transmitted to TCP server 4 after receiving the packet that TCP client 2 sends.
Gateway1 Protocol Spoofing Based timer pretends to be TCP server 4 regularly to send deception reply data bag to TCP client 2, and TCP client 2 is received deception reply data bag, continues to send packet to TCP server 4.
After Gateway3 receives the reply data bag of TCP server 4 transmissions, be connected sum with TCP according to reverse TCP link bandwidth and whether enable the control of acknowledgement back packet rate, if do not carry out the control of acknowledgement back packet rate, then this reply data bag is transmitted, otherwise the acknowledgement back packet is filtered.
Gateway1 judges after receiving the reply data bag, if new reply data bag, then the packet that this reply data bag was confirmed is deleted from buffer memory; If the reply data bag that repeats, just judge whether current TCP connection has enabled the selectivity retransmission mechanism, if enable, then the packet of bust this is retransmitted, the packet of transmission success does not retransmit, if not enabled is then retransmitted the sequence number minimal data bag that is not identified in the buffer memory.
If Gateway1 surpasses the re-transmission time and do not receive the reply data bag yet, the data re-transmission timer can be retransmitted the packet in the buffer memory.
In Gateway1 and the Gateway3 data transmission procedure TCP link bandwidth is distributed, and occur blocking in the transmission course and carry out retransmission process.
Embodiment Gateway1 is from the packet of network intercepting and capturing from the TCP client, if this packet is the tcp data bag, and SYN indicates, FIN indicates and the RST sign is not 1, continues then to judge whether the ACK sign is 1, if be not 1, then directly transmit this bag.
If receive the ACK of packet be masked as 1 and data length equal 0, so, further judge that whether this packet is from the LAN mouth, if then upgrade this connection transmit this bag for information about then, if not then ACK number of current data packet with a last packet ACK number being compared, carry out following three kinds of processing respectively according to comparative result:
(1) if the ACK of current data packet number greater than a last packet ACK number then upgrade in the TCP link information table this connection and remove cached data packet according to the ACK sequence number then, and abandon this bag for information about;
(2) if equal ACK number an of packet for the ACK of current data packet number, then upgrade in the TCP link information table this connection and then cached data packet is carried out the SACK mark for information about, and notice deception module suspends data and send, abandon this bag at last;
(3) if the ACK of current data packet number less than a last packet ACK number then abandons this bag.
If receive the ACK of packet be masked as 1 and data length greater than 0, so, further whether judge this packet,, carry out following three kinds of processing respectively according to comparative result if then the Bale No. of current data packet and a last packet numbers and data length sum are compared from the LAN mouth:
(1) if the Bale No. of current data packet equals a packet numbers and data length sum, this packet of buffer memory then is then with it forwarding;
(2) if the Bale No. of current data packet greater than a last packet numbers and data length sum, then data re-transmission is carried out in the notification data source, and abandons this bag;
(3) if the Bale No. of current data packet less than a last packet numbers and data length sum, then abandons this bag.
If receive the ACK of packet be masked as 1 and data length greater than 0, so, further judge that whether this packet is from the WAN mouth, if judge that then this packet ACK sequence number is whether greater than the ACK sequence number of a last packet, if greater than, then remove the indicated buffer memory bag of ACK sequence number, transmit this bag then, otherwise, directly transmit this bag data.
The method of in Gateway1 of the present invention and the Gateway3 data transmission procedure TCP link bandwidth being distributed comprises step:
Satellite TCP link bandwidth is set a thresholding speed,
Is that low discharge connects with actual speed rate less than the TCP linkage flag of thresholding speed, is that big flow connects with actual speed rate greater than the TCP linkage flag of thresholding speed,
All low discharges are connected, connect actual speed rate according to low discharge and distribute bandwidth, connect to all big flows the remaining bandwidth mean allocation.
Embodiment is the fairness and the validity of individual assurance allocated bandwidth under the situation that has a plurality of TCP to connect, need connect shared bandwidth to each and carry out real-time adjustment.At first at thresholding speed of bandwidth settings of satellite forward link, then, is that low discharge connects with actual speed rate less than the linkage flag of above-mentioned thresholding speed, and be that big flow connects with actual speed rate greater than the linkage flag of above-mentioned thresholding speed, at last, connect for all low discharges, distribute bandwidth for it according to its actual speed rate, remaining bandwidth then mean allocation connects for all big flows.
Occur blocking the method for carrying out retransmission process in Gateway1 of the present invention and the Gateway3 data transmission procedure, comprise step:
The reply data bag sum that Gateway1 receives current time compares with last second sum constantly, if the sum of the reply data bag that current time is received equate with the sum in the last second moment, judge that then channel has taken place to block.
Gateway1 is zero reply data bag to TCP client 2 send windows, TCP client 2 is suspended sent data.
Gateway1 retransmits cached data packet to TCP server 4 repeatedly with the normal speed before blocking, and is 0 up to the cached data packet number.
Gateway1 sends normal deception reply data bag to TCP client 2, makes TCP client 2 restart to send data.
The embodiment occlusion detection is to confirm that by detecting the ACK that receives in the specific connection quantity of data packets realizes.In the process of transmitting of data, the ACK that the data source end is received confirms that packet should be ever-increasing, every certain interval of time is just confirmed current time ACK that sum and last a sum constantly of packet once compares, if current time ACK confirms the sum of packet and equated with the sum in a last moment, just judge that channel has taken place to block, and suspend the transmission data by the method notice tcp data terminal of Protocol Spoofing Based at once.Link occlusion detection flow chart as shown in Figure 2.After this, retransmitting cached data packet to destination repeatedly with the normal speed before blocking, is zero up to the cached data packet number, last, sends normal deception ack msg bag to data source, impels data source to restart to send data.
3. connect and remove
Gateway1 transmits to TCP server 4 after receiving that packet is removed in the connection of TCP client 2 transmissions.
Gateway3 transmits to TCP client 2 after receiving that packet is removed in the connection of TCP server 4 transmissions.
Gateway1 transmits to TCP client 2 after receiving that TCP server 4 is removed the reply data bag, this TCP connection tracking record of deletion and corresponding deception timer and the data re-transmission timer of deletion in TCP connection tracking record.
Gateway3 transmits to TCP server 4 after receiving that TCP client 2 is removed the reply data bag, this TCP connection tracking record of deletion and corresponding deception timer and the data re-transmission timer of deletion in TCP connection tracking record.
After in a single day embodiment Gateway1 intercepts and captures the packet that has FIN sign or RST sign that TCP client 2 sends, just to 4 forwardings of TCP server.TCP server 4 can send a corresponding with it reply data bag and a packet that has the FIN sign after receiving and connecting the dismounting packet.Gateway3 and Gateway1 can transmit these two packets to TCP client 2, wherein Gateway1 can delete track record and corresponding deception timer and the data re-transmission timer of deletion that this TCP connects from TCP connection tracking record when transmitting.TCP client 2 can be sent a corresponding with it reply data bag after receiving FIN packet from TCP server 4, Gateway1 and Gateway3 can transmit these two packets to TCP server 4, wherein Gateway3 can delete track record and corresponding deception timer and the data re-transmission timer of deletion that this TCP connects from TCP connection tracking record when transmitting.So far, connect dismounting.
Claims (3)
1. strengthen the method for Transmission Control Protocol performance in the satellite communication system, it is characterized in that comprising step:
1. connect and set up
Satellite transmission station TCP performance strengthen TCP that Gateway (1) receives that TCP client (2) is sent connect set up request data package after, transmit to Satellite Receiving Station TCP server (4),
Satellite Receiving Station TCP performance enhancing Gateway (3) transmits to TCP server (4) after receiving that request data package is set up in connection, and set up source IP address, source port, purpose IP address, the destination interface of request data package according to connection and set up TCP connection tracking record,
Gateway (3) receives the reply data bag that TCP server (4) sends, and transmits to TCP client (2), upgrades TCP connection tracking record,
Gateway (1) receives the reply data bag that TCP server (4) sends, transmit to TCP client (2), set up TCP connection tracking record according to reply data bag source IP address, source port, purpose IP address, destination interface, connect sum, TCP server (4) receive window size establishment Protocol Spoofing Based timer and overtime retransmission timer according to current TCP link bandwidth, TCP
Gateway (1) receives the reply data bag of TCP client (2), transmits to TCP server (4), upgrades TCP connection tracking record,
Gateway (3) receives from connecting sum, TCP server (4) receive window size establishment Protocol Spoofing Based timer and overtime retransmission timer according to current TCP link bandwidth, TCP behind the reply data bag of TCP client (2);
2. transfer of data
Gateway (1) preserves and packet is transmitted to TCP server (4) after receiving the packet that TCP client (2) sends,
Gateway (1) Protocol Spoofing Based timer pretends to be TCP server (4) regularly to send deception reply data bag to TCP client (2), and TCP client (2) is received deception reply data bag, continue to send packet to TCP server (4),
After Gateway (3) receives the reply data bag of TCP server (4) transmission, be connected sum with TCP according to reverse TCP link bandwidth and whether enable the control of acknowledgement back packet rate, if do not carry out the control of acknowledgement back packet rate, then this reply data bag is transmitted, otherwise the acknowledgement back packet is filtered
After receiving the reply data bag, Gateway (1) judges that if new reply data bag, then the packet that this reply data bag was confirmed is deleted from buffer memory; If the reply data bag that repeats, just judge whether current TCP connection has enabled the selectivity retransmission mechanism, if enable, then the packet of bust this is retransmitted, the packet of transmission success does not retransmit, if not enabled is then retransmitted the sequence number minimal data bag that is not identified in the buffer memory
If Gateway (1) surpasses the re-transmission time and do not receive the reply data bag yet, the data re-transmission timer can be retransmitted the packet in the buffer memory,
In Gateway (1) and Gateway (3) data transmission procedure TCP link bandwidth is distributed, and occur blocking in the transmission course and carry out retransmission process;
3. connect and remove
Gateway (1) transmits to TCP server (4) after receiving that packet is removed in the connection of TCP client (2) transmission,
Gateway (3) transmits to TCP client (2) after receiving that packet is removed in the connection of TCP server (4) transmission,
Gateway (1) transmits to TCP client (2) after receiving that TCP server (4) is removed the reply data bag, this TCP connection tracking record of deletion and corresponding deception timer and the data re-transmission timer of deletion in TCP connection tracking record,
Gateway (3) transmits to TCP server (4) after receiving that TCP client (2) is removed the reply data bag, this TCP connection tracking record of deletion and corresponding deception timer and the data re-transmission timer of deletion in TCP connection tracking record;
Finish and strengthen the Transmission Control Protocol performance in the satellite communication system.
2. strengthen the method for Transmission Control Protocol performance in a kind of satellite communication system according to claim 1, it is characterized in that: the method for 2. the TCP link bandwidth being distributed in the Gateway (1) described in the step and Gateway (3) data transmission procedure comprises step:
Satellite TCP link bandwidth is set a thresholding speed,
Is that low discharge connects with actual speed rate less than the TCP linkage flag of thresholding speed, is that big flow connects with actual speed rate greater than the TCP linkage flag of thresholding speed,
All low discharges are connected, connect actual speed rate according to low discharge and distribute bandwidth, connect to all big flows the remaining bandwidth mean allocation.
3. strengthen the method for Transmission Control Protocol performance in a kind of satellite communication system according to claim 1, it is characterized in that: 2. the method for carrying out retransmission process occurs blocking in the Gateway (1) described in the step and Gateway (3) data transmission procedure, comprises step:
The reply data bag sum that Gateway (1) receives current time compares with last second sum constantly, if the sum of the reply data bag that current time is received equate with the sum in the last second moment, judge that then channel has taken place to block,
Gateway (1) is zero reply data bag to TCP client (2) send window, makes TCP client (2) suspend the transmission data,
Gateway (1) retransmits cached data packet to TCP server (4) repeatedly with the normal speed before blocking, and is 0 up to the cached data packet number,
Gateway (1) sends normal deception reply data bag to TCP client (2), makes TCP client (2) restart to send data.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1552147A (en) * | 2001-02-06 | 2004-12-01 | 休斯电子公司 | Performance intensifying proxy and method for infensifying performance |
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