CN104506230A - Multipath parallel and reliable transmission method applicable to satellite network - Google Patents

Multipath parallel and reliable transmission method applicable to satellite network Download PDF

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Publication number
CN104506230A
CN104506230A CN201410796826.3A CN201410796826A CN104506230A CN 104506230 A CN104506230 A CN 104506230A CN 201410796826 A CN201410796826 A CN 201410796826A CN 104506230 A CN104506230 A CN 104506230A
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transmission
path
paths
data
bandwidth
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CN104506230B (en
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叶晓国
朱安顺
王明伟
徐忠国
吴昊
钟鹏
马连杰
沈辉
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
    • H04B7/18534—Arrangements for managing transmission, i.e. for transporting data or a signalling message for enhancing link reliablility, e.g. satellites diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability

Abstract

The invention provides a multipath parallel and reliable transmission method applicable to a satellite network, and aims to improve the reliability of parallel transmission of a high-bandwidth data stream under a satellite network environment. According to the method, the concept of redundant transmission is mainly introduced into the parallel transmission, so that the problem that the parallel transmission of the high-bandwidth data stream is low in reliability is solved; furthermore, by combination of the specific condition of the satellite network, a method for reducing the influence of the redundant transmission on the load of the whole network is provided. According to a multipath bandwidth distribution scheme, an optimization math model is used for meeting the requirements that the parallel transmission of high-bandwidth data is used as a constraint condition and the reliability of the multipath transmission is used as an optimizing target, so that the effect of finishing the most reliable parallel transmission by only using finite multiple paths can be finally achieved.

Description

A kind of multipath being applicable to satellite network walks abreast method for reliable transmission
Technical field
The present invention relates to the multipath method for reliable transmission of high-bandwidth data stream under a kind of satellite network, belong to satellite network communications field.The multipath particularly related under satellite network walks abreast and redundant transmission, parallel transmission is utilized to realize the basic transmission demand of high-bandwidth data stream, then, on the basis of the whole net load of assessment, Rational choice redundant transmission paths number, strengthens reliability by redundant transmission.
Background technology
Satellite communication system, owing to having not by features such as the restriction of geographic location constraint, weather conditions and independent universal service abilities flexibly, has become the indispensable part of global communication.In recent years, along with the increase of worldwide traffic and the variation of type service, satellite network problems faced is also further severe.All have QoS demand due to many in the business that newly increases, this just requires that satellite network can provide to user and more reliably serves more efficiently.
Multipath advantage in effective utilized bandwidth, increase transmission reliability and fault-tolerance etc. is significant, can meet the QoS demand of user.Can find that the research direction of multipath mainly contains two by literature survey, be parallel transmission and redundant transmission respectively, wherein improves by redundant transmission the emphasis that transmission reliability is then research.
About parallel transmission, the present invention the analysis found that, reliable parallel transmission needs the data all Successful transmissions on every paths, and the failed transmission of any paths all will cause the failed transmission of whole high-bandwidth data stream, the reliability of transmission is not high, is necessary to improve.
About redundant transmission, existing pertinent literature has made clear and definite definition all separately to this, in general, data redundancy transmits by the main thought of redundant transmission exactly on mulitpath, like this, even if certain paths breaks down, other path also can ensure reaching of data, improves the reliability of transfer of data.But the present invention finds through investigation, and redundant transmission will inevitably increase the load of satellite network, and we are necessary effectively to control redundant path number.
Summary of the invention
Technical problem: object of the present invention to walk abreast method for reliable transmission with regard to being to provide a kind of multipath being applicable to satellite network, redundant transmission is introduced in the parallel transmission of high-bandwidth data stream, the reliability of parallel transmission is increased by redundant transmission, and the present invention is with reference to having carried out conservative control to the redundancy of redundant transmission with network load, the basis ensureing reliability reduces redundant transmission as far as possible on the impact of satellite network load.
Technical scheme:
One, main thought
This method relates generally to three parts, and one is the determination of transmission path number: according to the change function of network load about time and region, determine the transmission path number under current space-time environment; Two is determinations of best transmission scheme: utilize optimized thought, the scheme selecting reliability maximum in all transmission paths; Three is distribution of bandwidth: high band wide data be divided on different paths and transmit.
The determination of transmission path number: this method utilizes MATLAB fitting tool to carry out matching to the discrete profile samples point of satellite network user in 24 hours, by the observation to matched curve, find that the Fourier curve fitting effect on 3 rank is best, thus having drawn the continuous function (as shown in Figure 2) of the x change in time of satellite network user f (x) shown in formula (1), obvious f (x) show also satellite network load over time.
f ( x ) = a 0 + a 1 cos ( xw ) + b 1 sin ( xw ) + a 2 cos ( 2 xw ) + b 2 sin ( 2 xw ) + a 3 cos ( 3 xw ) + b 3 sin ( 3 xw ) = a 0 + Σ n = 1 3 ( a n cos ( nxw ) + b n sin ( nxw ) )
a 0＝4.996
a 1＝-2.293,b 1＝-3.901 (1)
a 2＝1.14,b 2＝0.2794
a 3＝-1.008,b 3＝-0.9416
w＝0.3321
About the division of satellite network load about region, global subdivision is the less non-focus region of hot spot region that number of users is intensive and number of users by this method, and represent two kinds of regions by different hot point factor h values, the expression hot spot region that h value is larger, represents the satellite load covering this region heavier.
So far, we just can draw function N (x) of number of path about time and region:
N(x)＝(-f(x)+U)/(h 1+h 2) (2)
So number of path N rounding exactly to N (x) functional value, then can obtain N:
N (x) is the variation tendency function of number of path about the time, obvious time dependent network load f (x) and the network load h (h with geographical diversity 1, h 2represent the hot point factor of source, object satellite node respectively) larger, corresponding N (x) is less, meets the original intention controlling satellite network load.The object that wherein constant U introduces is the excursion of control N (x), make the available bandwidth of min (N) paths and meet basic high band wide data transmission demand, parallel (nonredundancy) that namely minimum transmission path number also can meet satellite network user high band wide data instantly transmits demand.In actual applications, U, h 1and h 2determined according to the link bandwidth of present satellites network and the statistical information of user's behaviour in service by floor control system.
The determination of best transmission scheme: the N bar feasible path determining satellite transmission data under current space-time environment, next just need reasonably for every paths distributes the bandwidth task of transmission, make it the reliability improving transfer of data on the basis completing high band wide data and substantially transmit demand as much as possible.Here this method uses following optimization constraint equation to determine best transmission plan:
max { Π i = 1 2 m - N P i × Π i = 2 m - N + 1 m [ 1 - ( 1 - P i ) 2 ] }
s.t (4)
Σ i = 1 m C i ≥ C total ,
P irepresent the reliability of the i-th paths;
C irepresent the available bandwidth of the i-th paths;
C totalrepresent the bandwidth needed for high band wide data;
N: total transmission path number;
M: the number of path of parallel transmission.
According to the requirement of best transmission scheme demand fulfillment, this method using meeting the constraints of basic transmission demand as optimization equation, using reliability as target function.Wherein represent that the m bar chosen is used for total available bandwidth in path of parallel transmission and is greater than the bandwidth needing to transmit data, the basic transmission demand of such guarantee data, left N-m paths is just used for the data on the low path of redundant transmission reliability, and such guarantee improves the transmitting demand of data.Here the reliability in path be according to path the reliability of all links of process tire out and take advantage of result to assess, the tired corresponding reliability in path taking advantage of result little is just lower.
This method selects the data that the minimum path of N-m bar reliability is transmitted from m bar parallel transmission paths, utilizes N-m bar redundant transmission paths redundant transmission twice, so the probability of every paths Successful transmissions is expressed as (1-(1-P in this N-m paths i) 2), the higher path of remaining 2m-N bar reliability without the need to redundant transmission, so the probability of data Successful transmissions is exactly P on every paths i, the success rate that can obtain transfer of data is thus
For constraints wherein N is maximum transmission path numbers of satellite network under the current space-time environment calculated according to formula (2) and formula (3), so m≤N is obvious. this constraints is mainly based on following 2 considerations:
1: ensure that redundancy is no more than 2, because now the number of path of N-m bar redundant transmission is not more than the m paths number of parallel transmission, residue is not had after redundant path distribution once, for satellite network, redundant transmission once enough meets the demand improving reliability, more how will increase network load.
2: the uniform distribution realizing bandwidth, reduce the load of every transmission paths.This number of path at parallel transmission is not enough shi Youxiao, at this time can force m to force to be set as lower limit increase parallel transmission path number, realize bandwidth and distribute in a wider context, reduce the load of every paths.
In sum, this method utilizes the optimization equation of formula (4) finally can both meet transmission demand from concentrated the searching out of feasible path, meets again the path allocation scheme that reliability is maximum.
Bandwidth allocation scheme: through the determination of best transmission scheme, this method obtains the path of m bar parallel transmission, next we need this m paths reasonably allocation of transmission bandwidth, and this method is come for each transmission path distributes bandwidth according to the available bandwidth ratio in each path.
TC j = C total × C j Σ i = 1 m C i , j ∈ L ′ - - - ( 5 )
C j: the available bandwidth of path j;
the available bandwidth of parallel transmission paths and;
TC j: distribute to the data bandwidth that path j needs transmission;
L': the set of parallel transmission paths.
Two: concrete steps
This method comprises three parts, and one is the determination of transmission path number: according to the change function of network load about time and region, determine the transmission path number under current space-time environment; Two is determinations of best transmission scheme: utilize optimized thought, the scheme selecting reliability maximum in all transmission paths; Three is distribution of bandwidth: transmitted to different paths by original Data Segmentation;
Concrete steps are as follows:
Step 1. source satellite node obtains current time, and geographical location information, calculates the number of path N of this transmission;
Step 2. source satellite node sends probe messages in inundation mode, the node serial number of each intermediate, satellite node of probe messages record process and link available bandwidth and reliability information;
Step 3: object satellite node returns front N bar probe messages to the former road of source satellite node;
Step 4: the path that source satellite node utilizes optimized Mathematical Modeling to select m bar parallel transmission completes basic transmission demand, remaining N-m paths is used for redundant transmission;
Step 5: high band wide data is divided on m bar parallel route according to bandwidth allocation scheme and transmits by source satellite node, and the bandwidth that N-m bar redundant transmission paths is distributed is consistent with the bandwidth that the path of corresponding parallel transmission is distributed;
Step 6:N paths is respectively simultaneously to the data after object satellite node transmission segmentation;
Step 7: object satellite node receives the data of N paths, deletes the repeating data because redundant transmission produces and is assembled into complete initial data;
Step 8: initial data is uploaded by object satellite node, so far, high band wide data transmission is complete.
Wherein:
Optimized Mathematical Modeling described in step 4 is:
max { Π i = 1 2 m - N P i × Π i = 2 m - N + 1 m [ 1 - ( 1 - P i ) 2 ] }
s.t
Σ i = 1 m C i ≥ C total ,
P irepresent the reliability of the i-th paths;
C irepresent the available bandwidth of the i-th paths;
C totalrepresent the bandwidth needed for high band wide data;
N: total transmission path number;
M: the number of path of parallel transmission.
Bandwidth allocation scheme described in step 5 is:
TC j = C total × C j Σ i = 1 m C i , j ∈ L ′
C j: the available bandwidth of path j;
the available bandwidth of parallel transmission paths and;
TC j: distribute to the data bandwidth that path j needs transmission;
L': the set of parallel transmission paths.
Beneficial effect:
One, improve the reliability of high band wide data under parallel transmission
The present invention proposes a kind of by multipath redundant transmission and the method that multipath parallel transmission is combined, be used for improving the reliability of high band wide data parallel transmission.The emphasis of current multipath research is mainly placed in the research of raising data transmission credibility, and the research of parallel transmission high band wide data is not also a lot.And traditional parallel transmission is only transmitted as object substantially with what reach data, but ignores the defect that parallel transmission reliability is lower.
The concept of redundant transmission, on the basis that have studied multipath redundant transmission, is incorporated into parallel transmission by the present invention, by the data that redundant transmission reliability is lower, reaches the object improving whole high band wide data parallel transmission reliability.We only need prove that the introducing of redundant transmission can improve the reliability of parallel transmission.
Prove as follows: we might as well with the simplest two paths transmitting data in parallel, and a redundant transmission paths is example here.
Suppose there is path R 1and R 2data DATA after parallel transmission high band wide data DATA segmentation 1and DATA 2, path R 1and R 2reliability be P respectively 1and P 2(P 1>=P 2).So can obtain, the probability P=P of data DATA Successful transmissions 1× P 2.Owing to method introduces redundant path, suppose that redundant path is R here 3, its reliability is P 3.According to the thought of this method, due to P 1>=P 2, so will R be used 3redundant transmission R 2on data, so DATA 2the probability of transmitting is 1-(1-P 2) (1-P 3).Can obtain now data DATA Successful transmissions probability P '=P 1× (1-(1-P 2) (1-P 3)).So have:
P′-P
＝P 1×(1-(1-P 2)(1-P 3))-P 1×P 2
＝P 1P 3-P 1P 2P 3
＝P 1P 3(1-P 2)＞0
So P<P' perseverance is set up.Thus the reliability that redundant transmission introducing parallel transmission must increase parallel transmission must be demonstrate,proved.
Two, the operative constraint number of path of multipath, alleviates the load of whole net
Find through investigation, the implementation of multipath mainly contains following two kinds: a kind of is the mulitpath produced in advance from source node to destination node, then according to certain policy selection a certain paths transmission data.Another produces many transmission paths in real time, transmitted by data scatter to these paths.
Obviously, first kind of way is not suitable for the parallel transmission of high band wide data, so this method have selected the second way.This method, on the basis of the second way, considers time, these two factors of region, has carried out Dynamic controlling to the number of multipath.Compared to traditional multipath implementation, this method can control the impact of multipath on the whole net load of satellite network effectively.
Accompanying drawing explanation
Fig. 1 is the specific implementation flow chart of high band wide data transmission.
Fig. 2 is satellite network user distribution map in time
Fig. 3 is specific embodiment
Embodiment
For convenience of description, we suppose there is following application example, as shown in Figure 3: required bandwidth is that the data of 2048kb/s are sent to object satellite node D by source satellite node S needs, but the residue link bandwidth in satellite network cannot support single path transmission means.At this moment, Data Segmentation is transmitted on path 1 and path 2, can requirement be reached.Because the probability of path 2 transmitting is lower, so the data on path 2 to be repeated on path 3 transmission.For convenience, under we suppose current space-time environment here, 3 paths can meet transmission demand.The step of carrying out practically is as follows:
Step 1: source satellite node S, to the indiscriminate path detection message of object satellite node D inundation, finally returns path 1, path 2 and path 3 three paths, and returns available bandwidth and the node reliability of three paths.
Step 2: source satellite node obtains the available bandwidth 1360kb/s in path 1, the available bandwidth 1300kb/s in the path 2 and available bandwidth 1370kb/s in path 3.
Step 3: the reliability of source satellite node calculating path, namely takes advantage of tired for the reliability of the path uplink of acquisition, obtains the reliability of three paths respectively: P 1=0.90345024, P 2=0.8382528 and P 3=0.832258361088.
Step 4: source satellite node selects transmission plan according to formula (4), and path 1 and path 2 complete the basic transmission demand of data, the data in path 3 redundant transmission paths 2.(can see only use path 1 and path 2 parallel transmission time reliability be: P 1× P 2=0.7573, not very high.The reliability added after the redundant transmission of path 3 is 0.8789, and reliability improves much.)
Step 5: source satellite node distributes bandwidth according to formula (5), and send data to object satellite node.
Step 6: object satellite node receives data, and assembles.

Claims (3)

1. the multipath being applicable to satellite network walks abreast method for reliable transmission, it is characterized in that this method comprises three parts, one is the determination of transmission path number: according to the change function of network load about time and region, determine the transmission path number under current space-time environment; Two is determinations of best transmission scheme: utilize optimized thought, the scheme selecting reliability maximum in all transmission paths; Three is distribution of bandwidth: transmitted to different paths by original Data Segmentation;
Concrete steps are as follows:
Step 1. source satellite node obtains current time, and geographical location information, calculates the number of path N of this transmission;
Step 2. source satellite node sends probe messages in inundation mode, the node serial number of each intermediate, satellite node of probe messages record process and link available bandwidth and reliability information;
Step 3: object satellite node returns front N bar probe messages to the former road of source satellite node;
Step 4: the path that source satellite node utilizes optimized Mathematical Modeling to select m bar parallel transmission completes basic transmission demand, remaining N-m paths is used for redundant transmission;
Step 5: high band wide data is divided on m bar parallel route according to bandwidth allocation scheme and transmits by source satellite node, and the bandwidth that N-m bar redundant transmission paths is distributed is consistent with the bandwidth that the path of corresponding parallel transmission is distributed;
Step 6:N paths is respectively simultaneously to the data after object satellite node transmission segmentation;
Step 7: object satellite node receives the data of N paths, deletes the repeating data because redundant transmission produces and is assembled into complete initial data;
Step 8: initial data is uploaded by object satellite node, so far, high band wide data transmission is complete.
2. the multipath being applicable to satellite network according to claim 1 walks abreast method for reliable transmission, it is characterized in that the optimized Mathematical Modeling described in step 4 is:
max { &Pi; i = 1 2 m - N P i &times; &Pi; i = 2 m - N + 1 m [ 1 - ( 1 - P i ) 2 ] }
s.t
&Sigma; i = 1 m C i &GreaterEqual; C total ,
P irepresent the reliability of the i-th paths;
C irepresent the available bandwidth of the i-th paths;
C totalrepresent the bandwidth needed for high band wide data;
N: total transmission path number;
M: the number of path of parallel transmission.
3. the multipath being applicable to satellite network according to claim 1 walks abreast method for reliable transmission, it is characterized in that the bandwidth allocation scheme described in step 5 is:
TC j = C total &times; C j &Sigma; i = 1 m C i , j &Element; L &prime; C j: the available bandwidth of path j;
the available bandwidth of parallel transmission paths and;
TC j: distribute to the data bandwidth that path j needs transmission;
L': the set of parallel transmission paths.
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CN112564943A (en) * 2020-11-20 2021-03-26 北京邮电大学 Data transmission method, system and medium based on multiple network nodes
CN113872715B (en) * 2021-12-06 2022-02-22 成都市以太节点科技有限公司 Multipath signal simulation method, system, electronic equipment and storage medium
CN113872715A (en) * 2021-12-06 2021-12-31 成都市以太节点科技有限公司 Multipath signal simulation method, system, electronic equipment and storage medium
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