CN105681296A - Method for reducing TCP (Transmission Control Protocol) message loss in space information network - Google Patents
Method for reducing TCP (Transmission Control Protocol) message loss in space information network Download PDFInfo
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- CN105681296A CN105681296A CN201610017036.XA CN201610017036A CN105681296A CN 105681296 A CN105681296 A CN 105681296A CN 201610017036 A CN201610017036 A CN 201610017036A CN 105681296 A CN105681296 A CN 105681296A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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]
- H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
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Abstract
The invention provides a method for reducing TCP (Transmission Control Protocol) message loss in a space information network, and aims at providing a method capable of reducing data packet loss efficiently, increasing link throughput and avoiding meaningless retransmission of a transmitting terminal when a link is disconnected. The method for reducing the TCP message loss in the space information network is realized through the following technical scheme comprising the steps of adding transmission and storage modules at a transmission end of a TCP; presetting a connection time sequence PAB(t) between any node A and a node B based on a known movement track of an artificial satellite and characteristics of link disconnection caused by shielding of a predictable celestial body in the space information network with a node movement rule to follow, wherein PAB(t)=1 indicates that the node A and the node B are in a link connection state at the moment t; and PAB(t)=0 indicates that the node A and the node B are in a link disconnection state at the moment t; firstly verifying the value of the PAB(t0) by the transmitting node A at any moment t0 in a network running process; if PAB(t0)=1, sending a data packet to the target node B; and if PAB(t0)=0, caching the data packet in a storage module of the TCP, wherein the cached data packet is extracted from the cache for transmission in the next moment t=t1 when the PAB (t) is enabled to be equal to 1.
Description
Technical field
The present invention relates to a kind of method improving transmission control protocol TCP performance in Information Network communication protocol techniques field, be specifically related to a kind of increasing in the Transmission Control Protocol of transport layer and send memory module to reduce the method that TCP message is lost.
Background technology
Along with advancing by leaps and bounds of electronics and wireless communication technology, network has been deep into the every aspect of human society productive life, network technology is changed to mobile wireless transmission by fixing wire transmission, expanded to space-air-ground integration network structure by torus network structure traditionally, static node develop to high speed dynamic node. Particularly in recent years countries in the world to the concern of space resources and exploitation, the fast development of aeronautical and space technology, foundation and development for Information Network system provide good material and technical support, and Information Network system will become the important component part in the future network world. But, Information Network is faced with that network topology change frequency is high, joint movements speed fast, propagated between nodes time extend, the challenge such as the space link bit error rate is high, space nodes is resource-constrained, have a strong impact on the reliability of Information Network data transmission, become restriction Information Network exploitation and the important technology obstacle used.
On current ground, most networks all adopt TCP/IP protocol suite. TCP (TransmissionControlProtocol, transmission control protocol) is a kind of connection-oriented, reliable, transport layer communication protocol based on byte stream. In the computer network osi model simplified, it completes the 4th layer of function specified by transport layer. In internet protocol suite (Internetprotocolsuite), TCP layer is in the intermediate layer on IP layer, under application layer. Application layer sends for data stream that transmit between network, that represent with octet to TCP layer, and then TCP divides data stream into the message segment of suitable length.TCP passes to IP layer message afterwards, it message is sent to the TCP layer of receiving terminal by network. TCP is in order to ensure not occur packet loss, and just to one sequence number of each bag, sequence number also ensure that the received in-order of the bag being sent to receiving terminal simultaneously. Then a corresponding confirmation beamed back by the bag having had successfully received by receiving terminal; If transmitting terminal does not receive confirmation in rational round-trip delay, then corresponding packet is assumed to lose and retransmit. Whether TCP carrys out testing data with a verification and function wrong; Send and receive time will calculate verification and. In standard ICP/IP protocol, only when end-to-end link exists, just can set up route end to end and send data. When not having end-to-end link, will be unable to send data, the packet that send all can be dropped. Although ground network mostly adopts TCP/IP protocol suite at present, but Information Network often cannot directly use Transmission Control Protocol. This is because there is a lot of difference between Information Network and ground network, main manifestations is:
1) long delay: the time delay of satellite channel is longer, it is 20-25ms that most cases bends down rail system one way propagation time delay, middle rail system is 100-130ms, stationary orbit system is 250-280ms, Time Delay of Systems is also by the impact of the factors such as Route Selection, on-board processing and queuing delay between star, and it is demonstrated experimentally that when time delay is more than 20ms, TCP performance starts severe exacerbation.
2) high bit-error: when being free from mistakes control coding, the bit error rate of satellite link is about 10-4-10-6The order of magnitude, and the bit error rate of ground optical fiber is 10-10The order of magnitude, high bit error rate will cause that number of retransmissions increases.
3) uplink downlink is asymmetric: namely have higher data transmission rate on a transmission direction, and owing to being subject to the restriction of antenna size and transmitting power, the link on another direction causes that message transmission rate is relatively low.
4) link discontinuously connects and rule can be followed: artificial satellite moves according to its track, it is possible to is blocked by the earth or other celestial body, causes the interruption of communication link; But then, owing to the motion of various celestial bodies and artificial satellite has periodically and regular, thus it is foreseeable owing to celestial body blocks the link down caused.
Owing to there is these difference, the TCP/IP protocol suite that ground network uses can not run directly in Information Network, it is necessary to formulates new procotol according to the feature of Information Network or modifies.
Network node (abbreviation node) refer to a computer or other equipment and one have absolute address and there is the network transmitting or receiving data function be connected. Node can be work station, client, the network user or personal computer, it is also possible to is the equipment of server, printer and the connection of other networks. Each workstation servers, terminal unit, the network equipment, the equipment namely having oneself unique network address is all network node. Whole network is made up of this various network node, many network node communication lines is coupled together, forms certain geometrical relationship, here it is computer network topologies. In Information Network, synchronous satellite, LEO satellite, stratosphere balloon, people or UAV, earth station etc. is had to broadly fall into network node.
Summary of the invention
The present invention is directed to the problems such as spatial environments link resource utilization low, message transmissions is unreliable, feedback link transmission quantity increase that standard ICP/IP protocol discontinuously connects at high bit error, long delay, link, feature according to Information Network, there is provided one can improve Transmission Control Protocol handling capacity, the method effectively reduce tcp data message dropping, reducing meaningless re-transmission, to improve the problem that standard TCP protocol cannot adapt to spatial environments.
To achieve these goals, the technical solution used in the present invention is as follows: a kind of reduce the method that TCP message in Information Network is lost, it is characterised in that comprise the steps: to increase at Transmission Control Protocol transmitting terminal to send memory module; Pre-seting node connection sequential in the governed Information Network of joint movements rule, what define any sending node A and any destination node B connects the function P that sequential is time tABT (), defines PABT ()=1 represents that moment t sending node A and destination node B is in the state that link connects, define PABT ()=0 represents that moment t sending node A and destination node B is in the state that link disconnects; In network operation process, if t=t at any time0, the TCP message that sending node A has to destination node B needs to send, and sending node A first verifies that PAB(t0) value, if PAB(t0)=1, then send packet to destination node B; If PAB(t0)=0, then by data pack buffer in the memory module of TCP, and the packet being buffered will make P at the next oneABThe moment t=t of (t)=11, extract from buffer memory and recover to send.
The present invention has the beneficial effects that:
1, the present invention has pre-seted internodal connection sequential in the governed Information Network of joint movements rule, and definition sending node A and destination node B connects the function P that sequential is time tAB(t), wherein PABT ()=1 is that moment t sending node A and destination node B is in the state that link connects, and PABT ()=0 is moment t sending node A and the destination node B state being in that link disconnects; So can effectively reducing in the non-existent situation of end-to-end link, what transmission control protocol TCP was meaningless sets up the unnecessary expense connected and produce; Further increase Transmission Control Protocol handling capacity, effectively reduce tcp data message dropping.
2, the present invention adds memory module at Transmission Control Protocol transmitting terminal, and by judging whether moment t has end to end connectivity path, has, send packet, it does not have then by data pack buffer in TCP memory module; And the packet being buffered, then can network node connect sequential be changed to connected state by off-state time, recover TCP send; So can largely alleviate in standard TCP protocol owing to there is no memory space, once current time link is off, the problem that data-bag lost will occur, can the loss of effective little data bag, and then reduce the TCP probability retransmitted, reduce the bandwidth pressure of feedback link, thus improving the spatial environments adaptability of Transmission Control Protocol.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the present invention reduces that in Information Network, TCP message is lost.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described.
As it is shown in figure 1, according to the present invention, increase at Transmission Control Protocol transmitting terminal and send memory module; And in the governed Information Network of joint movements rule, pre-set internodal connection sequential. Owing to the movement locus of celestial bodies various in spatial network and artificial satellite is known, it is predictable that celestial body blocks the link down caused, so internodal connection sequential can be pre-seted in the governed Information Network of joint movements rule, definition arbitrary node A and arbitrary node B connects the function P that sequential is time tABT (), defines PABT ()=1 represents that moment t node A and node B is in the state that link connects, define PABT ()=0 represents that moment t node A and node B is in the state that link disconnects. Definition sending node A and destination node B connects the function P that sequential is time tAB(t), wherein, PABT ()=1 represents that the link between moment t sending node A and destination node B is in connected state, and PABT ()=0 represents that the link between moment t sending node A and destination node B is in the state of disconnection;Definition buffer memory time-out time T, represents that tcp data message can the maximum duration of buffer memory in described TCP memory module. What define any sending node A and arbitrarily joint point of destination B connects the function P that sequential is time tABT (), defines PABT ()=1 represents that moment t sending node A and destination node B is in the state that link connects, define PABT ()=0 represents that moment t sending node A and destination node B is in the state that link disconnects; The measurable characteristic of the movement locus according to various celestial bodies and artificial satellite, is also predictable owing to celestial body blocks the link down caused, i.e. PABT () is a known function. In network operation process, according to known PAB(t), at any time t0If sending node A has TCP message to need to send, and sending node A first verifies that PAB(t0) value, if PAB(t0)=1, then send packet to destination node B; If PAB(t0)=0, then, by data pack buffer in the memory module of communication module TCP, the packet being buffered will make P at the next oneABThe moment t=t of (t)=11, extract from buffer memory and recover tcp data transmission.
Specifically include following steps.
At moment t=t0, sending node A place creates the packet needing to be sent to destination node B; First sending node A inquires about current time t0Connection sequential function PAB(t0) value, be used for judging destination node B whether up to, if PAB(t0)=1, then obtain the address of destination node B, and transmit described packet, process ends to destination node B;
If PAB(t0)=0, then described data pack buffer is entered in described TCP memory module by sending node A, and inquiry makes described connection sequential function PABThe next moment t=t of (t)=11If, t1-t0> T, then sending node A abandons described packet, sends unsuccessfully, process ends;
If t1-t0< T, then node A is at moment t1From described TCP memory module, extract described packet, re-start transmission, process ends.
It should be noted that the usual value of buffer memory time-out time T is that a few minutes were to 1 hour.
It should be noted that; for a person skilled in the art; can technical scheme as described above and design, make other various corresponding changes and deformation, and all these change and deformation all should belong within the protection domain of the claims in the present invention.
Claims (5)
1. one kind is reduced the method that in Information Network, TCP message is lost, it is characterised in that comprise the steps: to increase at Transmission Control Protocol transmitting terminal to send memory module; Pre-seting node connection sequential in the governed Information Network of joint movements rule, what define any sending node A and any destination node B connects the function P that sequential is time tABT (), defines PABT ()=1 represents that moment t sending node A and destination node B is in the state that link connects, define PABT ()=0 represents that moment t sending node A and destination node B is in the state that link disconnects; In network operation process, if t=t at any time0, the TCP message that sending node A has to destination node B needs to send, and sending node A first verifies that PAB(t0) value, if PAB(t0)=1, then send packet to destination node B; If PAB(t0)=0, then by data pack buffer in the memory module of TCP, and the packet being buffered will make P at the next oneABThe moment t=t of (t)=11, extract from buffer memory and recover to send.
2. the method that in minimizing Information Network as claimed in claim 1, TCP message is lost, it is characterised in that: at moment t=t0, sending node A place creates the packet needing to be sent to destination node B;First sending node A inquires about current time t0Connection sequential function PAB(t0) value, be used for judging destination node B whether up to, if PAB(t0)=1, then obtain the address of destination node B, and transmit described packet, process ends to destination node B.
3. the method that in minimizing Information Network as claimed in claim 2, TCP message is lost, it is characterised in that: if PAB(t0)=0, then described data pack buffer is entered in described TCP memory module by sending node A, and inquiry makes described connection sequential function PABThe next moment t=t of (t)=11If, t1-t0> buffer memory time-out time T, then sending node A abandons described packet, sends unsuccessfully, process ends.
4. the method that in minimizing Information Network as claimed in claim 3, TCP message is lost, it is characterised in that: if t1-t0< T, then node A is at moment t1From described TCP memory module, extract described packet, re-start transmission, process ends.
5. the method that in minimizing Information Network as claimed in claim 1, TCP message is lost, it is characterised in that: buffer memory time-out time T value is that a few minutes were to 1 hour.
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| CN101521603A (en) * | 2008-12-26 | 2009-09-02 | 中兴通讯股份有限公司 | Method and system for quickly detecting connectivity of link |
| US20100088511A1 (en) * | 2007-01-26 | 2010-04-08 | Thales | Information transmission security method |
| CN101826984A (en) * | 2010-04-08 | 2010-09-08 | 中兴通讯股份有限公司 | Log information processing method and device thereof |
| CN105119842A (en) * | 2015-07-15 | 2015-12-02 | 中国电子科技集团公司第十研究所 | Method of setting round trip time (RTT) parameter in disruption tolerant network |
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- 2016-01-11 CN CN201610017036.XA patent/CN105681296A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020188753A1 (en) * | 2001-06-12 | 2002-12-12 | Wenting Tang | Method and system for a front-end modular transmission control protocol (TCP) handoff design in a streams based transmission control protocol/internet protocol (TCP/IP) implementation |
| US20100088511A1 (en) * | 2007-01-26 | 2010-04-08 | Thales | Information transmission security method |
| CN101521603A (en) * | 2008-12-26 | 2009-09-02 | 中兴通讯股份有限公司 | Method and system for quickly detecting connectivity of link |
| CN101826984A (en) * | 2010-04-08 | 2010-09-08 | 中兴通讯股份有限公司 | Log information processing method and device thereof |
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