CN102891736B - Isomeric link frame size adaptive method applied to aerospace information network - Google Patents
Isomeric link frame size adaptive method applied to aerospace information network Download PDFInfo
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- CN102891736B CN102891736B CN201210384532.0A CN201210384532A CN102891736B CN 102891736 B CN102891736 B CN 102891736B CN 201210384532 A CN201210384532 A CN 201210384532A CN 102891736 B CN102891736 B CN 102891736B
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Abstract
The invention discloses an isomeric link frame size adaptive method applied to an aerospace information network. Through analyzing and comparing a rate R of the number of negative feedback signals to the number of positive feedback signals in the process of selective automatic retransmission during a certain period T, the transmission frame size is dynamically adjusted, so that the utilization rate of a channel is maximized, and the communication ability of the aerospace information network is comprehensively improved; and through adopting the adaptive frame size, the disturbing influence on a link of the aerospace information network can be sensed more accurately, thereby improving the efficiency of network communication. The aerospace information network comprises at least a geostationary satellite, a set of low earth orbit satellites and a ground control center, wherein signal carriers are transmitted among earth station and the satellites, and the ground control center manages a plurality of adjacent earth stations, sends control information to the earth stations, and is mainly used for improving the utilization rate of a channel under the condition that factors such as environments and the like cause interference on satellite signal links.
Description
Technical field
The present invention relates to a kind of heterogeneous links frame length adaptive approach being applied to space-sky information network, specifically a kind of ratio by the positive feedback signal in analysis satellite network Selective resending mechanism and negative-feedback signal carrys out estimating channel bit error rate situation, thus the method for adaptive control data in link layer element length, belong to technical field of satellite communication.
Background technology
Space-sky information network is the three-dimensional network resource Iarge-scale system on a set sky, sky, ground, it encompasses track residing for from earth surface to the high rail satellite apart from more than 3.6 ten thousand kilometer, ground, environment, platform, business, heterogeneous network converged, ad hoc networking, high speed data transfer etc. constitute the fundamental of space-sky information network.
Environment residing for space-sky information network comprises the air outer space from ground to 3.6 ten thousand kilometers, its constructing communication network ranges span stratosphere, intermediate layer, ionosphere and escape layer. because space-sky information network covering scope is large, communication distance is far away, corresponding communication delay comparatively ground network obviously exceeds a lot, as synchronous satellite (GEO) and the propagation delay time on ground are about 25Oms, so large propagation delay time brings great challenge to network control and network transmission efficiency.On the other hand, because wireless signal often needs through multiple different region in long propagation, larger interference can be brought to microwave, laser signal in various meteorological condition and ionosphere, cause the error rate of information transmission in space-sky information network higher, this can affect network transmission efficiency further.
Space-sky information network channel is the channel of an opening, and the electromagnetic wave that cosmic ray and the various mankind manufacture all may cause interference to the radio signal of band transmissions.Satellite-signal is propagated between ground station and satellite through long-distance in addition, can be subject to the impact of many factors.Such as free-space propagation loss, troposphere on the impact of radio wave propagation, ionosphere on the impact of radio wave propagation, multipath fading and shade capture-effect, Doppler frequency shift etc.The result disturbed is that the signal of band transmissions distorts.Some intensity of disturbing is very large and the duration is longer time, recipient correctly cannot demodulate signal, then communicate likely failure.
Frame length negotiation mechanism in wireline communication network is more representational cable network frame length solution.The communication link of this communication network is that communicating pair is monopolized, and there is not the problem of competitive channel.The selection of frame length depends primarily on the intensity of noise jamming.Communicating pair, when connecting, first by the assessment to link-quality, then is consulted to use different compression factor to encode, is finally determined the length of frame, this frame length can be adopted when current link is effective always to communicate.This frame length negotiation mechanism be only applicable to more stable link interference and too large change can not be there is in the state of communication link when, it disturbs the error code that produces to be repaired.But when larger change occurs the state of communication link, there is a large amount of mistakes in the frame that recipient receives, cannot continue to maintain normal communication, link is counted out, and needs again to consult to connect.For the good link of quality, communicating pair adopts high compression ratio coding, adds less redundant information, fully uses the communication capacity of link.For second-rate link, communicating pair adopts low compression coding, in the middle of every frame, add more redundant information, improves the error correcting capability of recipient, reduces that occur cannot the situation of frame of error correction.
The communication link quality of satellite communication network is poor, and environment is more severe.Because high dynamic flying device, near space platform are all moving at high speed, the environment of communication link may constantly change, no matter noise jamming is around that frequency or the fluctuating of Strength Changes may be quite violent, and the now interference of noise to communication will be very serious.In this case, the transmission of anchor-frame progress row is adopted can to bring the low of communication link service efficiency.Under severe communication link condition, adopt shorter frame to be just easy to avoid interference, the probability of conflict can be reduced well, make full use of the communication capacity of channel.Under good communication link condition, adopt longer frame, often successfully send and once just can transmit more information, realize making full use of of channel.Use long frame under severe conditions, send failed probability very large, therefore use the efficiency of long frame just to can not show a candle to and use short frame, so space-sky information network is more suitable for using elongated frame strategy, to improve the utilance of link to greatest extent.In addition, satellite communication channel belongs to point-to-multipoint delivery channel, when providing connection-oriented reliable link transmission service to upper strata, general employing autonomous retransmission (Automatic Repeat Request, ARQ) agreement, for long delay satellite link, stopping waiting for ARQ(Stop and Wait ARQ) protocol efficiency is lower, less employing.Rollback N frame ARQ(Go-Back-N Automatic Repeat Request, GBNARQ), with Sr-ARQ (Selective Repeat ARQ, SRARQ) agreement, all have employed sliding window mechanism, all Frames being positioned at current send window can be sent continuously, improve the bandwidth availability ratio of link under long delay chain environment.
Summary of the invention
technical problem:according to described above, because the many factors of natural environment can produce interference to satellite network link, the invention provides a kind of heterogeneous links frame length adaptive approach being applied to space-sky information network, its adopts a kind of rate value calculating negative-feedback signal in Selective resending mechanism and positive feedback signal carry out estimating channel bit error rate situation thus adjust the strategy of link frame length adaptively, solves the interference because the factors such as environment produce satellite link and the low problem of the channel utilization that causes.
technical scheme:the present invention is a kind of heterogeneous links frame length adaptive approach being applied to space-sky information network, and described space-sky information network system at least comprises a geostationary satellite, Constellation of Low Earth Orbit Satellites and a ground control centre; Transmission signal carrier wave between earth station and satellite, a ground control centre manages the earth station of some vicinities,
Send control information to it, improve under being mainly used in disturbed condition satellite-signal link produced in factors such as environment
Channel utilization, concrete control method is:
Error rate by stages is calculated optimum length of frame by step 1., setting frame length state,
Step 2., under Unknown Channel situation, is looked into optimum length of frame-error rate table with lowest bit error rate, is obtained transmission frame length;
Step 3. source sends data with this frame length value, and records present frame long status;
Step 4 is in cycle T, and transmission frame length remains unchanged, at the end of one-period T, and the negative-feedback signal in calculating selection autonomous retransmission process and the rate value R of positive feedback signal:
1) if R value is less than a, then think that channel conditions is good,
Check whether present frame long status is 00, if so, then keep present frame long value, continue to send data, and return step
3；
If not 00, increase frame length to next frame long status, set new frame length value, continue to send data, and return step
3；
2) if when R value is greater than a and is less than b, then think that channel conditions and current setting frame length value do not meet,
First check whether present frame long status is 11, if not, frame length should be reduced to previous frame long status, send number with this
According to, and return step 3;
If frame length state is 11, then keep existing frame length constant, if when number of retransmissions exceedes certain numerical value, object can be thought
Hold unreachable, should receiving station be reselected, and restart request to send/allowed to send RTS/CTS mechanism negotiation frame length
Degree;
Step 5 sends ED.
beneficial effect:the present invention proposes heterogeneous links frame length adaptive approach in a kind of space-sky information network, its adopts a kind ofly analyzes positive feedback signal in space-sky information network Selective resending mechanism and carrys out with the rate value of negative-feedback signal the strategy that estimating channel bit error rate situation adjusts link frame length adaptively, is mainly used in the interference that solution produces satellite-signal link due to factors such as environment and the low problem of channel utilization produced.
The selection of its frame length of frame length negotiation mechanism of usual employing depends primarily on the intensity of noise jamming.Communicating pair, when connecting, first by the assessment to link-quality, is consulted to use different compression factor to encode, is finally determined the length of frame, this frame length can be adopted when current ink is effective always to communicate.This frame length negotiation mechanism be only applicable to more stable link interference and too large change can not be there is in the state of communication link when, it disturbs the error code that produces to be repaired.But when larger change occurs the state of communication link, there is a large amount of mistakes in the frame that recipient receives, cannot continue to maintain normal communication, link is counted out, and needs again to consult to connect.Frame length adaptive strategy of the present invention is for channel variance situation, relatively select the number of negative-feedback signal and the ratio R of positive feedback number in autonomous retransmission process in some cycles T, if when this value is less than certain numerical value a, can think that present channel ambient conditions is relatively good or stable, so frame length is increased to that optimum frame long value corresponding to next error rate interval, if when this value is greater than certain value a, can think that error rate is larger under current transmission frame long value, suitably should reduce transmission frame length, frame length is reduced to that optimum frame long value corresponding to a upper error rate interval, the rest may be inferred makes the utilance of channel reach maximum, and avoid and constantly look into the larger problem of overhead that optimum length of frame and error rate table bring, comprehensively improve the communication capacity of space-sky information network, the adaptive mode of this uniqueness can the situation of change of promptly channel perception, Internet Transmission frame length is adjusted to suitable numerical value by within a short period of time.Adopt this adaptive frame length can the interference effect that is subject to of more accurate perception space-sky information network link, thus improve network communication efficiency.
Therefore, beneficial effect of the present invention mainly comprises perception chain environment interference quickly and accurately, effectively resists the environmental interference factors such as rain declines, and improves satellite communication signals quality, realizes adaptive link transmission frame length and controls.
Accompanying drawing explanation
Fig. 1 is according to Information Network organization chart of the present invention, and space-sky information network system is made up of four parts such as high rail satellite, low orbit satellite, ultrahigh speed mobile terminal, ground control centres.
Fig. 2 is according to frame length adaptive approach flow chart of the present invention.
Embodiment
Environmental change residing for space-sky information network channel is very large, and channel bit error rate is difficult to calculate exactly, but can estimate roughly.What proposed is the adaptive control frame length algorithm that a kind of rate value based on the positive feedback signal in space-sky information network Selective resending mechanism and negative-feedback signal estimates channel situation based on link frame length adaptive strategy.Its principle is:
The satellite channel error rate is generally 10
-4-10
-7between, for the ease of adjustment, channel bit error rate is divided into 4 intervals (code clerk is 00-11) by us, and calculate the optimum frame long value in this interval, at first and under not knowing channel situation, data are sent so that good error rate acquisition current transmission frame length is concurrent, then compare in some cycles T and select the number of negative-feedback signal and the ratio R of positive feedback number in autonomous retransmission process, if when this value is less than certain numerical value a, can think that present channel ambient conditions is relatively good or stable, so frame length is increased to that optimum frame long value corresponding to next error rate interval, if when this value is greater than certain value a, can think that error rate is larger under current transmission frame long value, suitably should reduce transmission frame length, frame length is reduced to that optimum frame long value corresponding to a upper error rate interval, the rest may be inferred makes the utilance of channel reach maximum, and avoid and constantly look into the larger problem of overhead that optimum length of frame and error rate table bring, comprehensively improve the communication capacity of space-sky information network.
one, architecture
Be made up of four parts such as high rail satellite, low orbit satellite, ultrahigh speed mobile terminal, ground control centres based on space-sky information network system of the present invention, as shown in Figure 1.
(1) geosynchronous satellite
Geosynchronous satellite and geo-stationary, coverage is large, and in present networks system, the task of geosynchronous satellite makes communication repeating.
(2) low orbit satellite
Low orbit satellite aspect ratio geosynchronous satellite is low, and chain-circuit time delay is short, and therefore its task is as access control equipment.
(3) high speed mobile terminal
High speed mobile terminal works in troposphere, and comprise the terminals near the ground such as fighter plane, naval vessel and tank, task is also access terminal.
(4) ground control centre
Ground control centre comprises ground satellite station, message recipient and trunking, and mainly carry information, the transmission of instruction and Processing tasks, is basic access node.
two, method flow
Be applied to the heterogeneous links frame length adaptive approach of space-sky information network, described space-sky information network system at least comprises a geostationary satellite, Constellation of Low Earth Orbit Satellites and a ground control centre; Transmission signal carrier wave between earth station and satellite, a ground control centre manages the earth station of some vicinities, send control information to it, improve channel utilization under being mainly used in the disturbed condition produced satellite-signal link in factors such as environment, concrete control method is:
Error rate by stages is calculated optimum length of frame by step 1., and setting frame length state, as marked shown in 2.
Step 2., under Unknown Channel situation, is looked into optimum length of frame-error rate table with lowest bit error rate, is obtained transmission frame length;
Step 3. source sends data with this frame length value, and records present frame long status;
Step 4 is in cycle T, and transmission frame length remains unchanged, at the end of one-period T, and the negative-feedback signal in calculating selection autonomous retransmission process and the rate value R of positive feedback signal:
1) if R value is less than a, then think that channel conditions is good,
Check whether present frame long status is 00, if so, then keep present frame long value, continue to send data, and return step
3；
If not 00, increase frame length to next frame long status, set new frame length value, continue to send data, and return step
3；
2) if when R value is greater than a and is less than b, then think that channel conditions and current setting frame length value do not meet,
First check whether present frame long status is 11, if not, frame length should be reduced to previous frame long status, send number with this
According to, and return step 3;
If frame length state is 11, then keep existing frame length constant, if when number of retransmissions exceedes certain numerical value, object can be thought
Hold unreachable, should receiving station be reselected, and restart request to send/allowed to send RTS/CTS mechanism negotiation frame length
Degree;
Step 5 sends ED.
Table 1 is optimum length of frame theoretical value in heterogeneous links situation in space-sky information network, link comprises: link between high rail satellite and low orbit satellite, link between high rail satellite and ground based terminal, link between low orbit satellite and low orbit satellite, link between low orbit satellite and ground based terminal.
Table 1
Table 2 is optimum length of frame theoretical values in various error rate situation.
Table 2
Claims (1)
1. be applied to a heterogeneous links frame length adaptive approach for space-sky information network, it is characterized in that described space-sky information network at least comprises a geostationary satellite, Constellation of Low Earth Orbit Satellites and a ground control centre; Transmission signal carrier wave between earth station and satellite, a ground control centre manages the earth station of some vicinities, send control information to it, improve channel utilization under being mainly used in the disturbed condition produced satellite-signal link in environmental factor, concrete control method is:
Error rate by stages is calculated optimum length of frame by step 1., setting frame length state,
Step 2., under Unknown Channel situation, is looked into optimum length of frame-error rate table with lowest bit error rate, is obtained transmission frame length;
Step 3. source sends data with this frame length value, and records present frame long status;
Step 4 is in cycle T, and transmission frame length remains unchanged, at the end of one-period T, and the negative-feedback signal in calculating selection autonomous retransmission process and the rate value R of positive feedback signal:
1) if R value is less than a, then think that channel conditions is good,
* check that whether present frame long status is 00, if so, then keeps present frame long value, continue to send data, and return step 3;
* if not 00, increase frame length to next frame long status, set new frame length value, continue to send data, and return step 3;
2) if when R value is greater than a and is less than b, then think that channel conditions and current setting frame length value do not meet,
* first check whether present frame long status is 11, if not, frame length should be reduced to previous frame long status, send data with this, and return step 3;
If * frame length state is 11, then keep existing frame length constant, if when number of retransmissions exceedes certain numerical value, can think that destination is unreachable, should receiving station be reselected, and restart request to send/allowed to send RTS/CTS mechanism negotiation frame length;
Step 5 sends ED.
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