CN107820227A - A kind of bus or train route wireless communication network service quality parameter test device - Google Patents
A kind of bus or train route wireless communication network service quality parameter test device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a kind of bus or train route wireless communication network service quality parameter test device, utilize Java language Integrated Development DSRC radio network test systems, afterwards test platform is built using the PC for loading the system with DSRC equipment to be measured, test experiments are carried out under real bus or train route communication environment to obtain DSRC wireless communication technology performance parameters, and it is based on experimental data obtained as above, obtain a new mathematical modeling and portray time delay distribution, to be the offer support such as the research of DSRC communication protocols and network optimization.The present invention can test the network performance of DSRC equipment under actual bus or train route communication environment, the time delay distribution theoretical model drawn based on experimental data, can provide data for DSRC product developments and the network optimization and support.
Description
Technical field
The present invention relates to actual performance of the DSRC technology (DSRC) in bus or train route communication environment to show, more particularly to
The communication network test device of test and the statistical analysis of each QoS parameter.
Background technology
Bus or train route coordination technique is that intelligent transportation system (Intelligent Traffic System, hereinafter referred to as ITS) is non-
Often important part, its basic thought are, by the utilization to multi-crossed disciplines fusion method, to utilize sensor wireless
The various advanced technologies such as network, computer information technology and wireless communication technology realize people in road traffic, car, the mutual intelligence in road
It can perceive and develop in harmony.By Che-car and Che-road communication technology, motor vehicle and road can be organically combined,
By gathering trackside and vehicle-mounted live state information so as to reaching the purpose efficiently made full use of to traffic resource.
In the research of bus or train route coordination technique, due to high vehicle speeds, the communication mechanism between vehicle limits ITS's
Development, therefore Vehicular communication system is the study hotspot in current bus or train route coordination technique field.At this stage, vehicle-carrying communication technology is ground
Studying carefully has had the technologies such as DSRC, FM, cellular network, Wimax and WiFi, wherein DSRC technology (Dedicated
Short Range Communication, hereinafter referred to as DSRC) it is the technology that special exploitation is used for carrying out vehicle-carrying communication.
DSRC technology can be several between car car, between bus and whole ITS provides the real-time wireless communication service of high speed
High according to transmission rate, transmission delay is short, supports point-to-point, point-to-multipoint communication, using this means of communication by between vehicle,
Organically linked together between vehicle and road.DSRC technology can support the public safety and no-stop charging system of vehicle,
The data transfer of high speed can be provided, and ensure the low delay of communication link and low interference, ensure the reliability of system, pass through collection
Trackside and vehicle-mounted live state information are so as to reaching the purpose efficiently made full use of to traffic resource.
At present, Che-car communication come what is realized, i.e., connects the vehicle to be formed mainly by multi-hop Ad-hoc by wireless network
Self-organizing network transmits information.Vehicle closer to the distance, information transfer can be carried out directly in the range of self-organizing network；And distance
Vehicle farther out, the transmission and receiving of row information can be entered by Radio Broadcasting Agreements and Wireless Routing Protocol.And Che-road communication, then it is
Enter the interaction of row information by vehicular communication equipment and trackside communication equipment.When vehicle communicates with trackside, pass through vehicle-carrying communication
Equipment receives the information such as traffic administration and control instruction after system is treated sent by trackside roadside device.
With the fast development of science and technology, Che-car communication communicates with Che-road and is turning to a variety of communications from traditional single-mode
Development model.Therefore in the higher information of acquisition requirement of real-time, DSRC technology has stronger practicality.
But it is relative with DSRC practicality, it is that it is used under the self-organizing network environment that In-vehicle networking node is formed
Some existing problems.Due to the topological structure of vehicular ad hoc network and road distribution, vehicle node motion, geographical environment etc.
Factor is closely related, and therefore, DSRC working environment has the characteristics of some other wireless communications environments do not possess.
First, network topology structure change is fast.Because the vehicle node translational speed under vehicle environment is very fast, therefore communicate
The life-span of link is comparatively shorter.And because vehicle node is continually added or exitted network, the topological structure of network
Change also quickly.Second, quality of wireless channel is unstable and bandwidth is restricted.Because the node of DSRC communications moves at a high speed
Influence of building etc. in dynamic, node relative velocity and road conditions, urban transportation, therefore, the sometimes vehicle in communication range
Node can not directly carry out information exchange.And in urban environment, traffic density is big, DSRC is made which results in node
The frequent competition of channel, so that actual bandwidth is less than theoretical value.Multipath also be present and decline in the channel that DSRC is used in addition
Fall, Doppler effect, shadowing effect the problems such as, therefore the bit error rate is higher, bad when good during so as to cause communication quality.3rd, car
The characteristics of motion of node can be predicted.Although vehicle node translational speed is very fast, because the situation of road is fixed with before
The existing constraint of square vehicle node, position, the direction of motion and the speed of node of information exchange are carried out using DSRC certain
In degree, it can measure or predict.4th, network opening and vehicle node are associated.In DSRC communication environments, greatly
The phenomenon that amount vehicle node frequently added or left network is present, and therefore, opening is DSRC communicates under vehicle environment one
Feature.The relative position between Adjacent vehicles, which exists, simultaneously is closely connected.
Based on this, DSRC test of dispatching from the factory is difficult to meet real communication environment requirement, and the test to DSRC both at home and abroad
It is to concentrate on physical layer test and testing protocol consistency etc. mostly, to test deficiency in terms of network performance.It is so of the invention
In terms of test and data analysis for QoS parameter, exploitation forms a bus or train route wireless communication test system.
The content of the invention
The present invention solves the technical problem of the test system of one bus or train route communication scenes for being applied to reality of structure
System, its core are QoS parameter (Quality of Service, hereinafter referred to as QoS) test；Loading is utilized afterwards
The PC of the system builds test platform with DSRC equipment to be measured, and test experiments are carried out under real bus or train route communication environment to obtain
Take the performance parameter of DSRC wireless communication technologys, while the real-time Monitoring Performance Parameters variation of server end of PC and preserve experiment
Data, and certain processing is carried out to the communication experiment data of preservation, for further analysis of the later stage to data.
The advantage of the invention is that：
By a strict efficient experimental situation and communication test system, the experimental data obtained by experiment is collected,
And utilize data distribution model, it can be estimated that DSRC network service quality (QoS), verify between Virtual network operator and client
Service-level agreement, can be provided for studying the congestion control mechanisms of effective DSRC communication protocols, can also be used as measurement DSRC
The index (Metric) of network path performance, updated to carry out routing optimality and route dynamic, it is excellent to also act as DSRC network
The foundation of change, load balancing is formulated according to it, while new network application can be given, such as CDN (Contention
Distribution Network) support is provided.
Brief description of the drawings
Fig. 1 is the design interface at Server ends in subscriber interface module of the present invention；
Fig. 2 is the design interface at Client ends in subscriber interface module of the present invention；
Fig. 3 is the operational flowchart of the present invention.
Embodiment
For the ease of the understanding of those skilled in the art, the present invention is made furtherly with reference to the accompanying drawings and examples
It is bright.It should be understood that these embodiments are merely to illustrate the present invention and can not be used for limiting the scope of the invention.In addition should manage
Solution, after the content of the invention lectured has been read, those skilled in the art can make various changes or modification to the present invention,
These equivalent form of values equally fall within the application appended claims limited range.
A kind of bus or train route wireless communication network service quality parameter test device of the present invention, including：
1st, test module.Test module is based on udp protocol, and by N number of packet encapsulation, Client ends are filled after bag in server
End receives, and received server-side is obtained respectively to the system time of first and last bags, so as to obtain between the time entirely encapsulated
Every further according to correlation formula acquisition design parameter.
In the present invention, the qos parameter mainly measured has time delay, packet loss, handling capacity and delay variation.
(1) time delay refers to the time required for packet is sent to another end from one end of a network.
Wherein：TilastAt the time of expression receives last packet, TifirstRepresent to send first packet when
Carve, n represents the quantity of packet；
(2) packet loss refers to that lost data packet number in test accounts for the ratio of transmitted data group.
Wherein：N ' expression incoming messages, k represent outgoing message；
(3) handling capacity refers to the quantity for being successfully delivered data in network in the unit interval.
Wherein：D represents overall transmission time, tiThe data volume size of every group of data is represented, n " represents the quantity of transmission data；
(4) delay variation refers to the variable quantity of time delay.
J=| Di+1-Di| (4)
Wherein：Di+1Represent i+1 time time delay, DiRepresent ith time delay；
The technical essential of the module is as follows：
(1) a large amount of encapsulated data packets.If the single transmission of packet, can largely it be called because of CPU so that CPU processing
Time can exceed propagation delay time, cause to measure the error increase of time delay.If encapsulated data packet, primary system function need to be only called
Entire packet can be transmitted, greatly reduces error caused by CPU run times.
(2) will average time as time delay.The method of testing of time delay is the difference of the time of Last bags and First bags, divided by
The quantity N of packet.With the increase of bag quantity, the error of time delay result can be gradually reduced, further close to actual value.
(3) server uses multiple threads.Client ends it is filling send packet while, need to using multiple threads come
Handle multiple functions.Follow-up work may may require that access of multiple OBU equipment to same RSU, then server end is just
Need to add thread pool to meet the needs at multiple Client ends.
2nd, subscriber interface module.User interface (User Interface, abbreviation UI) refers to man-machine interaction to software, behaviour
Make the global design of logic, beautiful interface.User interface is that the medium exchanged with information is interacted between system and user, it
Realize the internal form of information and the mankind can receive conversion between form.
In the present invention, user interface is two kinds：Server end subscribers interface and Client end subscribers interface.
In the user interface at Server ends, user can set the data package size and port numbers of experiment, click on
After " Confirm " is determined, click on " RUN " button Server ends and bring into operation.Meanwhile the interface can be by clicking on " Delay "
" Throughout " button can obtain real-time two kinds of line charts.The text box field of lower section can constantly show test
The real time information of parameters, it is respectively data package size, package number, data encapsulation quantity, packet loss, time delay per a line
And handling capacity.Data can be preserved into txt forms in computer by clicking on " Save ", be prepared for follow-up data processing.
Whole process will be exited by clicking on " Exit " button, ensure that port numbers are not occupied.Accompanying drawing 1 is seen at specific interface.
In the user interface at Client ends, user can set the data package size of experiment, Server ends IP address with
And port numbers, after clicking on " Confirm " determination, click on " RUN " button Client ends and bring into operation.In actual test, port
Selection be port numbers depending on DSRC communications platforms, due to the fact that when Client ends send data, be sent to first
Broadcasted after on DSRC communications platforms by DSRC, then in received server-side.Accompanying drawing 2 is seen at specific interface.
3rd, figure display module.The module is mainly based on the QoS data of the network communicating system of collection, construction folding
Line chart carries out real-time exhibition.The function of the module has " time delay line chart " and " handling capacity line chart "." time delay line chart " passes through
Click on " Delay " to be formed and shown, it can show the Delay obtained by each group of test in real time, and user can be with this reality
When monitor Delay Variation.And " handling capacity line chart " is formed and shown by click " Throughout ", it being capable of real-time exhibition
The change of each group of test handling capacity, corresponding to different data package sizes, the size of handling capacity is also different.
4th, data processing module.By a series of experiment, the present invention is set to collecting after the delay data come is analyzed
Determine the mechanism that a data distribution model is established, obtain adapting to the distributed model of real data distribution, so it is more accurate
The characteristics of describing DSRC time delay distributions.
First, in the data measuring method, the average of delay data sample need to be usedWith variance s2：
To carry out the fitting of delay data distribution, the present invention proposes such as drag：
In the model, g (xi, β) be the model probability density function, β is parameter vector (k1,k2,k3,k4,k5,k6,
k7), μ, σ, γ are respectively the parameter of the Cumulative Distribution Function of generalized extreme value distribution, can be obtained by combining the DSRC data of actual measurement
Average x and standard deviation s2, solved using Maximum Likelihood Estimation Method.Generalized extreme value function model is as follows：
Parameter μ, after σ, γ are determined, calculated in next step using nonlinear least square method, obtain parameter vector β most
Excellent solution.
Nonlinear least square method basic ideas, it is to estimate nonlinear Static with the quadratic sum of error minimum criterion
Model parameter, if the model of nonlinear system is y=g (x, β), y is the output of system in formula, and x is input, and β is parameter (they
Can be vector).If Q is the aggregate-value of error sum of squares, using vectorial β as variable, formula is as follows：
Next the present invention is calculated using L-M algorithms, so as to obtain Q (β) minimum value and optimal solution.General
The specific calculation procedure of L-M algorithms is as follows：
Step 1：Initialization.Given initial value β1, control constant ε is terminated, remembers k=1.
Step 2：Seek Jacobian matrix.Due in the algorithm, βk+1=βk+δk, therefore δ need to be confirmedk。
Formula g (xi,βk+δk) can be set at approximately：
g(xi,βk+δk)≈g(xi,βk)+Jiδk (10)
Wherein JiIt is g (xi,βk) on βkGradient (row vector)：
Step 3：Solve ξk.As the minimum value of the formula, now gradient related to δ Q (β) is zero.g(xi,βk+δk)
First approximation provide：
Or it is with vector representation：
Q(βk+δk)≈||y-g(βk)-Jδk||2 (13)
It is 0 to make derivative, can be tried to achieve：
(JTJ)δk=JT[y-g(βk)] (14)
Wherein J is the i-th behavior JiJacobian matrix, g (βk) it is the i-th behavior g (xi,βk) vector, y is the i-th behavior yi
Vector, this linear equation can obtain δk。
Or this equation can be replaced with the formula of damping, it is expressed as：
[JTJ+λkdiag(JTJ)]δk=JT|y-g(βk)| (15)
Wherein, diag (JTJ it is) by JTJ diagonal elements form diagonal matrix, thus formula can give the parameter to be estimated
Vectorial βkOne new increment δk。
Step 5：If the increment δ in the stepkLess than predefined termination control constant ε, then iteration stopping, last
Vectorial βkAs optimal solution, otherwise continue iteration, k=k+1.
λkIt is the non-negative damping factor that can be adjusted in each iteration.If Q reduces speed quickly, then λkIt can take
One less value so that the formula is more nearly Gauss-Newton's algorithm；If Q reduction deficiency, then λkIt can increase, make
Obtain further to gradient descent direction.Q is -2 [J on β gradientT(y-g(βk))]T, therefore for larger λk, the step
Suddenly can be iterated approximately along gradient direction.
Based on the delay data preserved in the algorithm, and experiment, it can obtain meeting the vectorial β under the experimental situation,
And obtain the distribution function of the model.According to experimental result, the model can preferably portray time delay distribution end to end.Extremely
This, testing the data of the time delay of gained can be simulated with model proposed by the present invention, be the quarter of DSRC time delay distributions
Picture provides preferable theoretical tool, and this model as obtained by real data is also more convincing compared to other models.
Step flow as shown in Figure 3, implement the inventive method and specifically include following steps：
1. communications platform builds step：DSRC test platforms are carried, the main PC for including loading the test system is with treating
The DSRC equipment of survey, it is ensured that communication environment is available and relatively stable.And using corresponding on the PC and DSRC equipment to be measured
Client ends and the user interface at Server ends tested.
2. communication steps：The data package size and port numbers at setting Server ends, and the data package size at Client ends,
Server ends IP address and port numbers, and " confirm " determination is clicked on, and " Run " operation.Observed after operation
The text box field at Server ends, when the text box field of lower section can constantly show the real time information of the parameters of test
When, illustrate the communication test system successful operation.
3. data observation and preservation step：Server ends include the function of generating real-time line chart, " time delay line chart "
Formed and shown by clicking on " Delay ", it can show the Delay obtained by each group of test in real time, and user can be with
This monitors Delay Variation in real time.And " handling capacity line chart " is formed and shown by click " Throughout ", it can be real-time
Show the change of each group of test handling capacity.Data are preserved if necessary, then click on " Save ", can be preserved a series of logical in real time
Letter data, and carry out next step data analysis.
4. communication system exit step：When Data Collection finishes, after carrying out communication test, click on Server ends and
" Exit " at Client ends, communication test system is exited, ensure that port numbers are not occupied.
5. setup delay data model step：After preserving data, the average of the data and variance are applied to model of fit,
And parameter beta is introduced, and the aggregate-value Q (β) for setting error sum of squares establishes formula by independent variable of β, uses a kind of L- as dependent variable
M algorithms are iterated calculating, so as to obtain the optimal solution of Q (β) minimum value and parameter beta.β optimal solution is drawn as parameter
Enter the model, and draw corresponding probability distribution graph.
6. data analysis step：By the probability distribution graph of fitting, the distribution situation of delay data is analyzed, and average,
The volume of data such as variance, standard deviation, updated to carry out routing optimality and route dynamic, also act as DSRC network optimization
Foundation, while new network application can be given to provide support.
The present invention is further illustrated with a specific embodiment below.
The present invention in train experiment, performance test experiment in client and server end each where PC respectively with
One DSRC communication equipment is connected, and the UDP bags that client is sent afterwards can be dealt into connected DSRC equipment first,
Therefore selection DSRC Port and IP rather than server in Port and IP setting above, are connected with client afterwards
DSRC equipment goes out UDP packet broadcasts, and soon, the DSRC equipment being connected with server end receives and issues server.Wherein
QoS data, preserved after server statistics, for the later stage carry out models fitting.
1. performing communications platform builds step：In experiment, a DSRC equipment can be placed in mobile automobile, and it is another
Platform is then integrally fixed at trackside, thus come do bus or train route communication V2I performance test.The present invention have chosen Beijing Institute of Aeronautics campus south in an experiment
One section of 200m on road section carries out the applied in network performance test of DSRC communications platforms, and vehicle is driven towards with certain speed and sails out of road
Side apparatus, vehicle repeats the action in experiment, while is communicated.
2. communication step.This experiment sets the data package size at Server ends as 64bytes, and port numbers are
6500, and set the data package size at Client ends as 64bytes, Server ends IP address is 192.168.1.1, port numbers
For 6503, and " confirm " determination is clicked on, and " Run " operation.
3. data observation is performed with preserving step.Server ends include the function of generating real-time line chart, " time delay broken line
Figure " is by clicking on " Delay " formation and showing, " handling capacity line chart " is by clicking on " Throughout " formation and showing, point
" Save " is hit, a series of real-time communication data can be preserved.
4. perform communication system exit step.Click on " Exit " button at Server ends and Client ends.
5. perform setup delay data model step.In this time testing, the average of experimental data is 0.4721, and standard deviation is
0.0309, μ=4565 can be tried to achieve using Maximum Likelihood Estimation Method, σ=0.0190, γ=0.2056, now the model can be preferable
Fitting data.Be further improved afterwards based on L-M algorithms, be iterated calculate and obtain vector value, can try to achieve β=
(3.0111,0.8449,0.9908,119.2557,-0.0018,-0.0038,1.0001)。
6. perform data analysis step.It is fitted by the analysis of experimental data and image, it is possible to find the fitting effect of the model
Fruit can preferably portray propagation delay time end to end.Follow-up data analysis in need can be used directly the model and carry out correlation
Analysis.
Claims (3)
1. a kind of bus or train route wireless communication network service quality parameter test device, including test module, subscriber interface module, figure
Display module and data processing module；
Test module is based on udp protocol, and by N number of packet encapsulation, Client ends are filled after bag in received server-side, are obtained respectively
Received server-side, so as to obtain the time interval entirely encapsulated, obtains measurement to the system time of first and last bags
Qos parameter has time delay, packet loss, handling capacity and delay variation；
Subscriber interface module UI distinguishes Server end subscribers interface and Client end subscribers interface；The user interface at Server ends
In, user can set the data package size and port numbers of experiment, after clicking on " Confirm " determination, click on " RUN " button
Server ends bring into operation；Meanwhile the interface obtains real-time two kinds of foldings by clicking on " Delay " and " Throughout " button
Line chart；Provided with text box field, text box field constantly shows the real time information of the parameters of test, is respectively per a line
Data package size, package number, data encapsulation quantity, packet loss, time delay and handling capacity；Clicking on " Save " can be by data
Txt forms are preserved into computer；Whole process will be exited by clicking on " Exit " button, ensure that port numbers are not occupied；
In the user interface at Client ends, user can set the data package size of experiment, Server ends IP address and port numbers,
After clicking on " Confirm " determination, click on " RUN " button Client ends and bring into operation；
For figure display module based on the QoS data for the network communicating system collected, construction line chart carries out real-time exhibition；If
There are " time delay line chart " and " handling capacity line chart "；" time delay line chart " by clicking on " Delay " formation and showing, it is real-time
Show the Delay obtained by each group of test；" handling capacity line chart " is formed and shown by click " Throughout ",
The change of each group of test handling capacity of its real-time exhibition；
Data processing module is handled delay data, establishes data distribution model, obtains point for adapting to real data distribution
Cloth model, and then more accurate the characteristics of describing DSRC time delay distributions.
2. a kind of bus or train route wireless communication network service quality parameter test device according to claim 1, described test
Time delay, packet loss, handling capacity and delay variation in module are specially：
(1) time delay refers to the time required for packet is sent to another end from one end of a network；
Wherein：TilastAt the time of expression receives last packet, TifirstAt the time of representing to send first packet, n
Represent the quantity of packet；
(2) packet loss refers to that lost data packet number in test accounts for the ratio of transmitted data group；
Wherein：N ' expression incoming messages, k represent outgoing message；
(3) handling capacity refers to the quantity for being successfully delivered data in network in the unit interval；
Wherein：D represents overall transmission time, tiThe data volume size of every group of data is represented, n " represents the quantity of transmission data；
(4) delay variation refers to the variable quantity of time delay；
J=| Di+1-Di| (4)
Wherein：Di+1Represent i+1 time time delay, DiRepresent ith time delay.
3. a kind of bus or train route wireless communication network service quality parameter test device according to claim 1, described data
In processing module, it is specially：
Obtain the average of delay data sampleWith variance s2：
Wherein：xiRepresent ith delay data, naRepresent the total number of samples of delay data；
If data distribution model is：
Wherein, g (xi, β) be the model probability density function, β is parameter vector (k1,k2,k3,k4,k5,k6,k7), μ, σ, γ
The respectively parameter of the Cumulative Distribution Function of generalized extreme value distribution, the average that the DSRC data by combining actual measurement obtainAnd mark
Accurate poor s2, solved using Maximum Likelihood Estimation Method；Generalized extreme value function model is as follows：
Parameter μ, after σ, γ are determined, calculated using nonlinear least square method, obtain parameter vector β optimal solution；
Described nonlinear least square method is specially substantially：If the model of nonlinear system is y=g (x, β), y is to be in formula
The output of system, x are inputs, and β is parameter, if Q is the aggregate-value of error sum of squares, using vectorial β as variable, formula is as follows：
Wherein：xiRepresent ith delay data, yiThe probability density of ith delay data is represented, N represents data total amount, Q (β)
Represent the summation of the error sum of squares for the probability density that n times probability density calculates with model.
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| CN116170354A (en) * | 2023-02-28 | 2023-05-26 | 重庆长安汽车股份有限公司 | Network performance test method, device, equipment and medium |
| CN116170354B (en) * | 2023-02-28 | 2024-05-14 | 重庆长安汽车股份有限公司 | Network performance test method, device, equipment and medium |
| CN116389256A (en) * | 2023-04-11 | 2023-07-04 | 广东云百科技有限公司 | New energy automobile networking system based on edge calculation |
| CN116389256B (en) * | 2023-04-11 | 2023-09-19 | 广东云百科技有限公司 | New energy automobile networking system based on edge calculation |
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