CN103476091A - Vehicle-mounted terminal wireless access method for vehicular access cooperative system - Google Patents

Abstract

The invention discloses vehicle-mounted terminal wireless access method for a vehicular access cooperative system. A wireless network access module is arranged on the a vehicle-mounted terminal, a wireless resource managing module is arranged on a road side wireless network AP or a base station, a combined wireless resource managing module is arranged on the Internet network side, information is transmitted and exchanged between the vehicle-mounted terminal and the wireless resource managing module and between the wireless resource managing module and the combined wireless resource managing module respectively through signaling and Internet, the QoS overall situation satisfaction, the network resource distribution overall situation effectiveness and the fairness are integrated into quantization parameters through the collaborative decision making of the vehicle-mounted terminal, the wireless resource managing module and the combined wireless resource managing module, and the parameters are driven to solve to enable a power system model to achieve wireless access decision information. By means of the vehicle-mounted terminal wireless access method, a vehicle-mounted terminal wireless access scheme capable of dynamically self adapting to network environment change can be given out from the comprehensive angle of guaranteeing the QoS overall situation satisfaction, the network resource distribution overall situation effectiveness and the fairness.

Description

A kind of radio switch-in method of the car-mounted terminal for the bus or train route cooperative system

Technical field

The inventive method relates to intelligent transportation system and wireless communication technology field, relates in particular to a kind of radio switch-in method of the car-mounted terminal for the bus or train route cooperative system.

Background technology

Automobile and field of traffic are the typical field of application of wireless network, and car-mounted terminal becomes the important mobile communication terminal of a class.Between " Che-Che (Vehicle-to-Vehicle; V2V) " and " Che-Lu (Vehicle-to-Infrastructure; V2I) " radio communication device, to carry out information interaction, be basic bus or train route cooperative system (Cooperative Vehicle and Infrastructure System, CVIS), in order effectively for car-mounted terminal, to provide information service, realize the integrated information reconciliation cooperation in people ,Che, road, the bus or train route cooperative system greatly depends on the plurality of wireless networks technology and carrys out application deployment.On the other hand, be accompanied by the high speed development of various wireless communication technologys and the widespread deployment of wireless network infrastructure, in many communication scenes, the dissimilar network superimposition lid of laying equal stress on that coexists in a large number, such as 3G (3rd-Generation, the 3G (Third Generation) Moblie technology) cellular network, WiFi (Wireless Fidelity, adopting wireless fidelity technology) wireless network, DSRC (Dedicated Short Range Communications, the Dedicated Short Range Communications, technology), On Satellite-earth Microwave Communication network etc. has formed complicated many nets environment together, for the information interactive process between car-mounted terminal in the bus or train route cooperative system and trackside facility provides diversified transfer function.Thus, in wireless network environment, development is for the wireless access technology of bus or train route cooperative system, for car-mounted terminal is selected preferably access network, the web application that to effectively utilize different radio network techniques be car-mounted terminal provides reliable information service, considers that the global assignment benefit of Internet resources and fairness in distribution become very important simultaneously.

Yet the wireless access technology that is applied to the bus or train route cooperative system faces the challenge from the aspects such as concurrency of web application QoS (Quality of Service) diversified demand, wireless network environment isomerism and dynamic, car-mounted terminal gregariousness and access network:

At first, from concrete application demand, application programs different on car-mounted terminal is different to the demand of bus or train route communication, for example, aspect many aspects of vehicle safety applications, possess low time delay, highly reliable communication performance between the transmission requirement of train safety information " Che-Che " or " Che-Lu "; Aspect traffic control, car-mounted terminal need to utilize wireless network that the real-time status information of vehicle (as exhaust emissions amount, fuel consumption etc.) is transferred to background data center, for the inline diagnosis analysis, this requires communication network that the transmission performance of high data rate, enough bandwidth can be provided for real time data; In non-security application facet, the on-vehicle information amusement program real-time or non real-time such as Online Video broadcasting, voice transfer, web page browsing or transmitting-receiving E-mail etc. is also different to the QoS demand of network.Therefore, the QoS demand of heterogeneous networks application program on the effective coordination car-mounted terminal, these different QoS demand parameters of comprehensive quantification, and select accordingly rational access network to ensure communication service, become major issue current and that future development bus or train route cooperative system wireless access technology need to be considered.

Secondly, from concrete technical standard, be applied to the consensus standard that the wireless network of bus or train route cooperative system bus or train route communication relies on different, for example, WLANs (Wireless Local Area Networks) supports the IEEE802.11a/b/g/n/p standard, WiMAX (World Interoperability for Microwave Access) supports the IEEE802.16a/e standard, and 3G has comprised the standards such as CDMA2000, WCDMA, TD-SCDMA.Network technology under various criterion is when providing communication service for car-mounted terminal, and service quality is subject to the impact of network QoS characteristics such as bandwidth capacity, packet loss, delay variation to a great extent; Meanwhile, along with car-mounted terminal flowing to and flowing out in the wireless network signal overlay area, network offers the also dynamic change along with the number of users of access network of available bandwidth of each car-mounted terminal, and the network QoS characteristic also can dynamically change because of the disturbance of deployed environment.Thus, the wireless access technology be applied in the bus or train route cooperative system not only should be able to guarantee that car-mounted terminal accesses preferably network, also should be able to adapt to the dynamic change of network environment to ensure the QoS demand of terminal.

In addition, in the situation that traffic flow is than comparatively dense, a large amount of car-mounted terminals present the cluster feature, and are moving multiple different web application on each terminal simultaneously.Therefore, car-mounted terminal colony and a large amount of application program concurrency accessing Internet resources, cause fierce Radio Resource warfare.

Thus, how successfully managing the challenge that in the bus or train route cooperative system, the factors such as the existing Radio Resource keen competition of bus or train route communication process, network environment dynamic change, the concurrent access of car-mounted terminal form, is current active demand of setting up the car-mounted terminal radio switch-in method.

Summary of the invention

Can not consider the defect of the factors such as wireless network resource keen competition, network environment dynamic change, the concurrent access of car-mounted terminal for overcoming existing wireless access technology, the present invention proposes a kind of radio switch-in method of the car-mounted terminal for the bus or train route cooperative system, different from traditional wireless access technology, the inventive method is by RRM module and the decision-making of joint radio resource management module cooperative of car-mounted terminal and trackside, QoS global satisfying degree by car-mounted terminal, a quantization parameter of the comprehensive one-tenth of the overall effectiveness that wireless network resource is distributed and global fair, utilize this comprehensive quantification driving parameter to solve the dynamical system model that the inventive method proposes, using the equilibrium solution vector of dynamical system as decision vector, therefrom obtain the decision information of car-mounted terminal wireless access, it is a kind of service truck mounted terminal QoS global satisfying degree that possesses, wireless network resource is distributed overall benefit and global fair sexuality, the radio access scheme that simultaneously for the wireless network environment changed, there is the dynamic self-adapting characteristic.

The present invention, for the car-mounted terminal radio switch-in method of bus or train route cooperative system, is characterized in that: in wireless network environment, and when each vehicle initially enters wireless network environment, the strongest wireless network of car-mounted terminal incoming wireless signal on vehicle; And each vehicle is started constantly by t, carry out a wireless network switching access at interval of time dt, concrete grammar is as follows:

Step 1: at t, constantly obtain the car-mounted terminal information on vehicle;

Making rolling stock number in wireless network environment is n; Vehicles identifications is i, i=1,2,3 ..., n; By the wireless network access module on vehicle i, obtain car-mounted terminal on vehicle i at t car-mounted terminal information constantly, be specially:

A, the wireless signal of launching by AP or the antenna for base station of many each wireless networks of network interface management submodules reception trackside, judge available wireless network according to wireless signal, and available wireless network is formed to accessible wireless network candidate collection CandidateNetSet _i;

B, receive the signaling message of the wireless network j of many network interfaces management submodules access by many network interfaces management submodules, j is wireless network identification, j=1,2,3 ..., m; M is whole wireless network numbers in wireless network environment; Many network interface management submodules also obtain the qos parameter information of wireless network j from the signaling message of wireless network j, comprise the available bandwidth currentNetB of wireless network j _j, wireless transmission time delay currentNetD _jwith network packet loss rate currentNetPLR _j, and by the qos parameter communication of described wireless network j to wireless network QoS information evaluation submodule; Simultaneously, the web application k of the operation of the car-mounted terminal on wireless network QoS information evaluation submodule collection vehicle i _iqoS demand parameter information, comprise network bandwidth requirements index bound parameter

with

wireless transmission time delay demand parameter bound parameter

with

network packet loss rate demand parameter bound parameter

with

k is web application sign, k=1,2,3 ..., p; P is web application quantity;

C, wireless network QoS information evaluation submodule, according to the QoS demand parameter information of the overall network application program of the qos parameter information of wireless network j and the operation of the car-mounted terminal on vehicle i, obtain car-mounted terminal QoS demand upper limit parameter and lower limit parameter on vehicle i; Car-mounted terminal QoS demand upper limit parameter on vehicle i comprises bandwidth demand upper limit parameter MTUpB _i, time delay demand upper limit parameter MTUpD _i, packet loss demand upper limit parameter MTUpPLR _i; Car-mounted terminal QoS demand lower limit parameter on vehicle comprises bandwidth demand lower limit parameter MTLowB _i, time delay demand lower limit parameter MTLowD _i, packet loss demand lower limit parameter MTLowPLR _ifor:

$\left\{\begin{array}{c}\mathrm{MTUp}{B}_i=\underset{k_i\∈\mathrm{ApplicationSe}{t}_i}{\mathrm{\Σ}}\mathrm{appUp}{B}_{k_i}\\ \mathrm{MTLow}{B}_i=\underset{k_i\∈\mathrm{ApplicationSe}{t}_i}{\mathrm{\Σ}}\mathrm{appLow}{B}_{k_i}\\ \mathrm{MTUp}{D}_i=\underset{k_i\∈\mathrm{ApplicationSe}{t}_i}{\min }\left\{\mathrm{appUp}{D}_{k_i}\right\}\\ \mathrm{MTLow}{D}_i=\underset{k_i\∈\mathrm{ApplicationSe}{t}_i}{\max }\left\{\mathrm{appLow}{D}_{k_i}\right\}\\ \mathrm{MTUpPL}{R}_i=\underset{k_i\∈\mathrm{ApplicationSe}{t}_i}{\min }\left\{\mathrm{appUpPL}{R}_{k_i}\right\}\\ \mathrm{MTLowPL}{R}_i=\underset{k_i\∈\mathrm{ApplicationSe}{t}_i}{\max }\left\{\mathrm{appLowPL}{R}_{k_i}\right\}\end{array}\right.---\left(1\right)$

In formula (1), ApplicationSet _imean the set of the overall network application program formation of the car-mounted terminal operation on vehicle i;

D, wireless network QoS information evaluation submodule, according to car-mounted terminal QoS demand upper limit parameter and lower limit parameter on vehicle i, obtain the car-mounted terminal QoS effectiveness parameter on vehicle i, comprise network bandwidth effectiveness parameter UtilityB _i, propagation delay time effectiveness parameter UtilityD _i, Network Packet Loss effectiveness parameter UtilityPLR _i;

$\left\{\begin{array}{c}\mathrm{Utility}{B}_i=\frac{\min \{\mathrm{currentNet}{B}_i,\mathrm{MTUp}{B}_i\}-\mathrm{MTLow}{B}_i}{\mathrm{MTUp}{B}_i-\mathrm{MTLow}{B}_i}\\ \mathrm{Utility}{D}_i=\frac{\mathrm{MTUp}{D}_i-\max \{\mathrm{currentNet}{D}_i,\mathrm{MTLow}{D}_i\}}{\mathrm{MTUp}{D}_i-\mathrm{MTLow}{D}_i}\\ \mathrm{UtilityPL}{R}_i=\frac{\mathrm{MTUpPL}{R}_i-\max \{\mathrm{currentNetPL}{R}_i,\mathrm{MTLowPL}{R}_i\}}{\mathrm{MTUpPL}{R}_i-\mathrm{MTLowPL}{R}_i}\end{array}\right.---\left(2\right)$

E, wireless network QoS information evaluation submodule, according to the car-mounted terminal QoS effectiveness parameter on vehicle i, adopt weighted average method to obtain the car-mounted terminal QoS comprehensive satisfaction MTSatisfaction on vehicle i _i;

MTSatisfaction _i=w ₁×UtilityB _i+w ₂×UtilityD _i+w ₃×UtilityPLR _i (3)

In formula (3), need to meet: w ₁, w ₂, w ₃equal weight coefficients, for being greater than 0 real constant, and w ₁+ w ₂+ w ₃=1;

Car-mounted terminal on F, vehicle i is by the MTUpB obtained _i, UtilityB _iand MTSatisfaction _ias the car-mounted terminal information of vehicle i, by multiple network management reason submodule, by signaling message, be broadcast to the RRM module.

Step 2: the RRM module forms set MTset by the car-mounted terminal on the vehicle i of access of radio network j _j, and utilize set MTset _jmTSatisfaction in car-mounted terminal information on interior vehicle i _i, obtain the QoS value of utility GroupUtility of wireless network j _j;

$\mathrm{CroupUtilit}{y}_j=\underset{{i\∈\mathrm{MTset}}_j}{\mathrm{\Π}}(1-\mathrm{MTSatisfactio}{n}_i)---\left(4\right)$

Simultaneously, the RRM module is also utilized set MTset _jmTUpB in the upper car-mounted terminal information of interior vehicle i _i, obtain the bandwidth resource allocation value of utility NetUtilityB of wireless network j _j;

$\left\{\begin{array}{c}\mathrm{\ΔNet}{B}_j=\min \{0,({\mathrm{Capacit}y}_j-\underset{i\∈{\mathrm{MTset}}_j}{\mathrm{\Σ}}\mathrm{MTUp}{B}_i)\}\\ \mathrm{NetUtility}{B}_j=\frac{2}{1+\exp (-g\×\mathrm{\Δ}{\mathrm{NetB}}_j)}\end{array}\right.---\left(5\right)$

In formula (5), Capacity _jthe bandwidth total capacity that means this wireless network j, according to practical application, the concrete technical standard setting of wireless network j, g is positive real constant.

Step 3: the RRM module is by the GroupUtility obtained _jand NetUtilityB _jand set

utilityB in car-mounted terminal information on interior vehicle i _i, by the wired mode of Internet, be transferred to the joint radio resource management module.

Step 4: the target radio network of determining the car-mounted terminal switching access on vehicle i;

The joint radio resource management module forms set NetSet by the whole wireless networks in wireless network environment, and the car-mounted terminal that will access on the vehicle of each wireless network forms car-mounted terminal set MT, the GroupUtility that utilizes subsequently the joint radio resource management module to receive _j, NetUtilityB _jwith the UtilityB in the car-mounted terminal information on vehicle i in set MT _icarry out decision-making, specific as follows:

A, joint radio resource management module are utilized

obtain QoS global satisfying degree parameter GlobalSatisfactio;

$\mathrm{GlobalSatisfaction}=1-\underset{j\∈\mathrm{NetSet}}{\mathrm{\Π}}\mathrm{GroupUtilit}{y}_j---\left(6\right)$

B, joint radio resource management module are utilized parameter N etUtilityB _j, obtain the wireless network bandwidth resource and distribute overall effectiveness parameter GlobalUtilityB;

$\mathrm{ClobalUtilityB}=\underset{j\∈\mathrm{NetSet}}{\mathrm{\Π}}\mathrm{NetUtility}{B}_j---\left(7\right)$

C, joint radio resource management module utilization set MTset _jutilityB in car-mounted terminal information on interior vehicle i _i, obtain the wireless network bandwidth resource and distribute global fair parameter GlobalAllocationFI;

$\left\{\begin{array}{c}\mathrm{FI}=\frac{{\left(\underset{j\∈\mathrm{MT}}{\mathrm{\Σ}}\mathrm{Utility}{B}_i\right)}^2}{\left|\mathrm{MT}\right|\×\left[\underset{j\∈\mathrm{MT}}{\mathrm{\Σ}}{\left(\mathrm{Utility}{B}_i\right)}^2\right]}\\ \mathrm{GlobalAllocationFI}=h\left(\mathrm{FI}\right)\end{array}\right.---\left(8\right)$

In formula (8), | MT| means to gather the number of element in MT, and h (FI) is:

$h\left(\mathrm{FI}\right)=\left\{\begin{array}{c}0;\mathrm{FI}\&le;0\\ \frac{{(2\&times;\mathrm{FI})}^r}{1+{(2\&times;\mathrm{FI})}^r};0<\mathrm{FI}\&le;0.5\\ 1-\frac{{(2-2\&times;\mathrm{FI})}^r}{1+(2-2\&times;\mathrm{FI})};0.5<\mathrm{FI}\&le;1\\ 1;\mathrm{FI}>1\end{array}\right.---\left(9\right)$

In formula (9), r is positive integer, r>2.

D, joint radio resource management module, finally according to GlobalSatisfa, GlobalUtilityB, GlobalAllocationFI, obtain comprehensive quantification parameter value α (t ₁):

$\left\{\begin{array}{c}\mathrm{\&alpha;}\left(t_1\right)=\mathrm{\&alpha;}(t_1-\mathrm{dt})+\mathrm{dt}\&times;[\mathrm{GAF}-\mathrm{\&alpha;}(t_1-\mathrm{dt})]\\ \mathrm{GAF}=({\mathrm{\&beta;}}_1\&times;\mathrm{GlobalSatisfaction}+{\mathrm{\&beta;}}_2\&times;\mathrm{GlobalAllocationFI})\&times;\mathrm{GlobalUtilityB}\end{array}\right.---\left(10\right)$

In formula (10), α (t ₁-dt) mean t ₁-dt comprehensive quantification parameter value constantly, t ₁for carrying out the moment of steps d; Parameter beta ₁and β ₂need to meet: β ₁+ β ₂=1, and β ₁with β ₂be the real constant that is greater than 0;

E, joint radio resource management module are according to comprehensive quantification parameter alpha (t ₁), utilize multinomial mathematics model to obtain parameter s yn and deg:

$\left\{\begin{array}{c}\mathrm{syn}=\underset{l=0}{\overset{n}{\mathrm{\&Sigma;}}}{a}_l\&times;{\left[\mathrm{\&alpha;}\left(t_1\right)\right]}^l\\ \mathrm{deg}=\mathrm{\&alpha;}\left(t_1\right)\end{array}\right.---\left(11\right)$

In formula (11), parameter n is positive integer; Parameter a _lneed to meet: a _n>0 and a _l>=0, l=0,1 ..., n-1, a _lbe real constant;

F, joint radio resource management module, according to parameter s yn and deg, are called car-mounted terminal wireless access decision-making dynamical system model, obtain the decision vector X of corresponding each wireless network of car-mounted terminal on vehicle i _i(t ₂):

X _i(t ₂)＝[x _i1(t ₂)，x _i2(t ₂)，x _i3(t ₂)，......，x _ij(t ₂)，......，x _im(t ₂)] ^T，i∈MT (12)

In formula (3),

$x_{\mathrm{ij}}\left(t_2\right)=x_{\mathrm{ij}}(t_2-\mathrm{dt})+\mathrm{dt}\&times;[\frac{\mathrm{syn}}{1+(x_{\max }^i(t_2-\mathrm{dt})-x_{\mathrm{ij}}(t_2-\mathrm{dt}){)}^2}-\mathrm{deg}\&times;x_{\mathrm{ij}}(t_2-\mathrm{dt})+{\mathrm{\&eta;}}_{\mathrm{ij}}];$

X _ij(t ₂-dt) be illustrated in t ₂-dt is the decision vector component of the corresponding wireless network j of vehicle i constantly, t ₂for carrying out the moment of step f; Parameter

η _ijfor the white Gaussian noise factor that the average of the corresponding wireless network j of vehicle i is 0, standard deviation is 1;

G, joint radio resource management module are according to decision vector X _i(t ₂), obtain the next time interval of car-mounted terminal on vehicle i (t+dt, t+2 * dt] in the target radio network j of access ^*, as decision information:

$j^{*}=\underset{j\&Element;\mathrm{NetSet}}{\arg \max }\left\{x_{\mathrm{ij}}\left(t_2\right)\right|x_{\mathrm{ij}}\left(t_2\right)\&Element;X_i\left(t_2\right)\}---\left(13\right)$

The RRM module of the wireless network j that h, the joint radio resource management module wired mode by Internet sends to the car-mounted terminal wireless access decision information i on vehicle i the car-mounted terminal of vehicle i constantly to access at t, i ∈ MTset _j, j ∈ NetSet.

Step 5: the RRM module of wireless network j receives the decision information j that the joint radio resource management module sends ^*, by signaling message, be broadcast to the current car-mounted terminal i be connected with wireless network j, i ∈ MTset _j, j ∈ NetSet.

Step 6: the many network interface management of the car-mounted terminal on vehicle i submodule receives the wireless access decision information j that signaling message sends ^*, judged, be specially:

If I is j ^*∈ CandidateNetSet _i, many network interfaces of the car-mounted terminal administration module on vehicle i is switched to wireless network j by the port of interconnection network ^*port, and the next time interval (t+dt, t+2 * dt] in keep and this wireless network j ^*wireless connections, utilize this wireless network j ^*for web applications all on terminal provides business service;

If II

the many network interface management of the car-mounted terminal on vehicle i submodule further judges whether the wireless network j that the constantly many network interface management of t submodule accesses belongs to set CandidateNetSet _iif: j ∈ CandidateNetSet _i, the car-mounted terminal on vehicle i the next time interval (t+dt, t+2 * dt] keep and being connected of this wireless network j; If

the many network interface management of the car-mounted terminal on vehicle i submodule is chosen set CandidateNetSet _ithe wireless network of middle signal strength signal intensity maximum as the next time interval (t+dt, t+2 * dt] access network;

If the car-mounted terminal on III vehicle i is still in wireless network environment and continue to need wireless network that business service is provided, the wireless network access module of this car-mounted terminal i next finish time in the time interval t+dt return to step 1, continue to carry out; Otherwise, the car-mounted terminal wireless network access module termination work on vehicle i.

The invention has the advantages that:

1, the present invention is for the car-mounted terminal radio switch-in method of bus or train route cooperative system, can, from service truck mounted terminal QoS global satisfying degree, the overall benefit of wireless network resource distribution and the comprehensive angle of global fair, provide a kind of radio access scheme of self adaptation dynamic network environment;

2, the present invention is for the car-mounted terminal radio switch-in method of bus or train route cooperative system, be not limited to the wireless access decision process for single car-mounted terminal, but from the angle of a plurality of car-mounted terminal interests of the whole, QoS demand and the network service quality of service truck mounted terminal colony in implementing the wireless access process;

3, the present invention is for the car-mounted terminal radio switch-in method of bus or train route cooperative system, the inventive method is in implementing car-mounted terminal wireless access process, not only from the network service quality of the network user's interests angle service truck mounted terminal, also consider utilization benefit and the fairness in distribution of Internet resources, with this, successfully managed the problem of Internet resources keen competition;

4, the present invention is for the car-mounted terminal radio switch-in method of bus or train route cooperative system, and the QoS comprehensive satisfaction parameter of introducing car-mounted terminal makes car-mounted terminal wireless access decision process possess the reasonability that ensures network user QoS benefit.

The accompanying drawing explanation

Fig. 1 is bus or train route communication architecture schematic diagram in the present invention;

Fig. 2 is the inventive method overall flow figure.

Embodiment

Below in conjunction with drawings and Examples, the present invention is further illustrated.

A kind of radio switch-in method of the car-mounted terminal for the bus or train route cooperative system of the present invention, the wireless network access module that comprises many network interface management submodules and wireless network QoS information evaluation submodule in the car-mounted terminal deploy, in wireless network AP or the base station deployment RRM module of trackside, dispose the joint radio resource management module in the Internet network; Pass through the signaling message decision-making information of air interface between many network interface management submodules of car-mounted terminal and the RRM module of trackside; Pass through the wire transmission mode decision-making information of Internet between the RRM module of trackside and joint radio resource management module; As shown in Figure 1.In wireless network environment, when each vehicle initially enters wireless network environment, the strongest wireless network of car-mounted terminal incoming wireless signal on vehicle; And each vehicle is started constantly by t, carry out a wireless network switching access at interval of time dt, as shown in Figure 2, concrete grammar is as follows:

Step 1: at t, constantly obtain the car-mounted terminal information on vehicle;

Making rolling stock number in wireless network environment is n; Vehicles identifications is i, i=1,2,3 ..., n; By the wireless network access module on vehicle i, obtain car-mounted terminal on vehicle i at t car-mounted terminal information constantly, be specially:

A, the wireless signal of launching by AP or the antenna for base station of many each wireless networks of network interface management submodules reception trackside, judge available wireless network according to wireless signal, and available wireless network is formed to accessible wireless network candidate collection CandidateNetSet _i;

B, receive the signaling message of the wireless network j of many network interfaces management submodules access by many network interfaces management submodules, j is wireless network identification, j=1,2,3 ..., m; M is whole wireless network numbers in wireless network environment; Many network interface management submodules also obtain the qos parameter information of wireless network j from the signaling message of wireless network j, comprise the available bandwidth currentNetB of wireless network j _j, wireless transmission time delay currentNetD _jwith network packet loss rate currentNetPLR _j, and by the qos parameter communication of described wireless network j to wireless network QoS information evaluation submodule; Simultaneously, the web application k of the operation of the car-mounted terminal on wireless network QoS information evaluation submodule collection vehicle i _iqoS demand parameter information, comprise network bandwidth requirements index bound parameter

with

wireless transmission time delay demand parameter bound parameter with

network packet loss rate demand parameter bound parameter with

k is web application sign, k=1,2,3 ..., p; P is web application quantity.

C, wireless network QoS information evaluation submodule, according to the QoS demand parameter information of the overall network application program of the qos parameter information of wireless network j and the operation of the car-mounted terminal on vehicle i, obtain car-mounted terminal QoS demand upper limit parameter and lower limit parameter on vehicle i; Wherein, the car-mounted terminal QoS demand upper limit parameter on vehicle i comprises bandwidth demand upper limit parameter MTUpB _i, time delay demand upper limit parameter MTUpD _i, packet loss demand upper limit parameter MTUpPLR _i; Car-mounted terminal QoS demand lower limit parameter on vehicle comprises bandwidth demand lower limit parameter MTLowB _i, time delay demand lower limit parameter MTLowD _i, packet loss demand lower limit parameter MTLowPLR _i; And:

$\left\{\begin{array}{c}{\mathrm{MTUpB}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\mathrm{\&Sigma;}}\mathrm{appUp}{B}_{k_i}\\ {\mathrm{MTLowB}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\mathrm{\&Sigma;}}{\mathrm{appLowB}}_{k_i}\\ {\mathrm{MTUpD}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\min }\left\{{\mathrm{appUpD}}_{k_i}\right\}\\ {\mathrm{MTLowD}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\max }\left\{{\mathrm{appLowD}}_{k_i}\right\}\\ {\mathrm{MTUpPLR}}_i=\underset{k_i{\&Element;\mathrm{ApplicationSet}}_i}{\min }\left\{{\mathrm{appUpPLR}}_{k_i}\right\}\\ {\mathrm{MTLowPLR}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\max }\left\{{\mathrm{appLowPLR}}_{k_i}\right\}\end{array}\right.---\left(1\right)$

In formula (1), ApplicationSet _imean the set of the overall network application program formation of the car-mounted terminal operation on vehicle i.

D, wireless network QoS information evaluation submodule, according to car-mounted terminal QoS demand upper limit parameter and lower limit parameter on vehicle i, obtain the car-mounted terminal QoS effectiveness parameter on vehicle i, comprise network bandwidth effectiveness parameter UtilityB _i, propagation delay time effectiveness parameter UtilityD _i, Network Packet Loss effectiveness parameter UtilityPLR _i;

$\left\{\begin{array}{c}{\mathrm{UtilityB}}_i=\frac{\min \{{\mathrm{currentNetB}}_i,{\mathrm{MTUpB}}_i\}-{\mathrm{MTLowB}}_i}{{\mathrm{MTUpB}}_i-{\mathrm{MTLowB}}_i}\\ {\mathrm{UtilityD}}_i=\frac{{\mathrm{MTUpD}}_i-\max \{\mathrm{curren}{\mathrm{tNetD}}_i,{\mathrm{MTLowD}}_i\}}{{\mathrm{MTUpD}}_i-{\mathrm{MTLowD}}_i}\\ {\mathrm{UtilityPLR}}_i=\frac{{\mathrm{MTUpPLR}}_i-\max \{{\mathrm{currentNetPLR}}_i,\mathrm{MTLowP}{\mathrm{LR}}_i\}}{{\mathrm{MTUpPLR}}_i-{\mathrm{MTLowPLR}}_i}\end{array}\right.---\left(2\right)$

E, wireless network QoS information evaluation submodule, according to the car-mounted terminal QoS effectiveness parameter on vehicle i, adopt weighted average method to obtain the car-mounted terminal QoS comprehensive satisfaction MTSatisfaction on vehicle i _i;

MTSatisfaction _i＝w ₁×UtilityB _i+w ₂×UtilityD _i+w ₃×UtilityPLR _i (3)

In formula (3), need to meet: w ₁, w ₂, w ₃equal weight coefficients, for being greater than 0 real constant, and w ₁+ w ₂+ w ₃=1, according to the concrete application scenarios setting of the inventive method, get

Car-mounted terminal on F, vehicle i is by the MTUpB obtained _i, UtilityB _iand MTSatisfaction _ias the car-mounted terminal information of vehicle i, by multiple network management reason submodule, by signaling message, be broadcast to the RRM module.

Step 2: the RRM module forms set MTset by the car-mounted terminal on the vehicle i of access of radio network j _j, and utilize set MTset _jmTSatisfaction in car-mounted terminal information on interior vehicle i _i, obtain the QoS value of utility GroupUtility of wireless network j _j;

${\mathrm{GroupUtility}}_j=\underset{i\&Element;{\mathrm{MTset}}_j}{\mathrm{\&Pi;}}(1-\mathrm{MTSatisfactio}{n}_i)---\left(4\right)$

The RRM module is also utilized set simultaneously

mTUpB in car-mounted terminal information on interior vehicle i _i, obtain the bandwidth resource allocation value of utility NetUtilityB of wireless network j _j;

$\left\{\begin{array}{c}{\mathrm{\&Delta;NetB}}_j=\min \{0,({\mathrm{Capacity}}_j-\underset{i\&Element;{\mathrm{MTset}}_j}{\mathrm{\&Sigma;}}{\mathrm{MTUpB}}_i)\}\\ {\mathrm{NetUtilityB}}_j=\frac{2}{1+\exp (-g\&times;{\mathrm{\&Delta;NetB}}_j)}\end{array}\right.---\left(5\right)$

In formula (5), Capacity _jthe bandwidth total capacity that means this wireless network j, according to practical application, the concrete technical standard setting of wireless network j, g is positive real constant, according to concrete application scenarios setting of the present invention, gets g=10.

Step 3: the RRM module is by the GroupUtility obtained _jand NetUtilityB _jand set utilityB in car-mounted terminal information on interior vehicle i _i, by the wired mode of Internet, be transferred to the joint radio resource management module;

Step 4: the switching access of radio network of determining vehicle i;

The joint radio resource management module forms set NetSet by the whole wireless networks in wireless network environment, and the car-mounted terminal that will access on the vehicle of each wireless network forms car-mounted terminal set MT, the GroupUtility that utilizes subsequently the joint radio resource management module to receive _j, NetUtilityB _jwith UtilityB in car-mounted terminal information on the vehicle i of set in MT _icarry out decision-making, specific as follows:

A, joint radio resource management module are utilized

, obtain QoS global satisfying degree parameter GlobalSatisfactio;

$\mathrm{GlobalSatisfaction}=1-\underset{j\&Element;\mathrm{NetSet}}{\mathrm{\&Pi;}}{\mathrm{GroupUtility}}_j---\left(6\right)$

B, joint radio resource management module are utilized parameter N etUtilityB _j, obtain the wireless network bandwidth resource and distribute overall effectiveness parameter GlobalUtilityB;

$\mathrm{GlobalUtilityB}=\underset{j\&Element;\mathrm{NetSet}}{\mathrm{\&Pi;}}{\mathrm{NetUtilityB}}_j---\left(7\right)$

C, joint radio resource management module utilization set MTset _jutilityB in car-mounted terminal information on interior vehicle i _i, obtain the wireless network bandwidth resource and distribute global fair parameter GlobalAllocationFI;

$\left\{\begin{array}{c}\mathrm{FI}=\frac{{\left(\underset{j\&Element;\mathrm{MT}}{\mathrm{\&Sigma;}}{\mathrm{UtilityB}}_i\right)}^2}{\left|\mathrm{MT}\right|\&times;[\underset{j\&Element;\mathrm{MT}}{\mathrm{\&Sigma;}}{\left({\mathrm{UtilityB}}_i\right)}^2}\\ \mathrm{GlobalAllocationFI}=h\left(\mathrm{FI}\right)\end{array}\right.---\left(8\right)$

In formula (8), | MT| means to gather the number of element in MT, and h (FI) is:

$h\left(\mathrm{FI}\right)=\left\{\begin{array}{c}0;\mathrm{FI}\&le;0\\ \frac{{(2\&times;\mathrm{FI})}^r}{1+{(2\&times;\mathrm{FI})}^r};0<\mathrm{FI}\&le;0.5\\ 1-\frac{{(2-2\&times;\mathrm{FI})}^r}{1+(2-2\&times;\mathrm{FI})};0.5<\mathrm{FI}\&le;1\\ 1;\mathrm{FI}>1\end{array}\right.---\left(9\right)$

In formula (9), r is positive integer, r > 2, according to the present invention, concrete application scenarios setting, get r=5.

D, joint radio resource management module, finally according to GlobalSatisfa, GlobalUtilityB, GlobalAllocationFI, obtain comprehensive quantification parameter value α (t ₁):

$\left\{\begin{array}{c}\mathrm{\&alpha;}\left(t_1\right)=\mathrm{\&alpha;}(t_1-\mathrm{dt})+\mathrm{dt}\&times;[\mathrm{GAF}-\mathrm{\&alpha;}(t_1-\mathrm{dt})]\\ \mathrm{GAF}=({\mathrm{\&beta;}}_1\&times;\mathrm{GlobalSatisfaction}+{\mathrm{\&beta;}}_2\&times;\mathrm{GlobalAllocationFI})\&times;\mathrm{GlobalUtilityB}\end{array}\right.---\left(10\right)$

In formula (10), α (t ₁-dt) mean t ₁-dt comprehensive quantification parameter value constantly, t ₁for carrying out the moment of steps d; Parameter beta ₁and β ₂need to meet: β ₁+ β ₂=1, and β ₁with β ₂be the real constant that is greater than 0, according to the concrete application scenarios setting of the inventive method, get

E, joint radio resource management module are according to comprehensive quantification parameter alpha (t ₁), utilize multinomial mathematics model to obtain parameter s yn and deg:

$\left\{\begin{array}{c}\mathrm{syn}=\underset{l=0}{\overset{n}{\mathrm{\&Sigma;}}}{a}_l\&times;{\left[\mathrm{\&alpha;}\left(t_1\right)\right]}^l\\ \mathrm{deg}=\mathrm{\&alpha;}\left(t_1\right)\end{array}\right.---\left(11\right)$

In formula (11), parameter n is positive integer; Parameter a _lneed to meet: a _n0 and a _l>=0, l=0,1 ..., n-1, a _lbe real constant, can, according to the concrete application scenarios setting of the inventive method, get n=4, a ₄=8, a ₁=10, a ₀=a ₂=a ₃=0.

F, joint radio resource management module, according to parameter s yn and deg, are called car-mounted terminal wireless access decision-making dynamical system model, obtain the decision vector X of corresponding each wireless network of car-mounted terminal on vehicle i _i(t ₂):

X _i(t ₂)＝[x _i1(t ₂)，x _i2(t ₂)，x _i3(t ₂)，......，x _ij(t ₂)，......，x _im(t ₂)] ^T，i∈MT (12)

In formula (12),

$x_{\mathrm{ij}}\left(t_2\right)=x_{\mathrm{ij}}(t_2-\mathrm{dt})+\mathrm{dt}\&times;[\frac{\mathrm{syn}}{1+{(x_{\max }^i(t_2-\mathrm{dt})-x_{\mathrm{ij}}(t_2-\mathrm{dt}))}^2}-\mathrm{deg}\&times;x_{\mathrm{ij}}(t_2-\mathrm{dt})+{\mathrm{\&eta;}}_{\mathrm{ij}}];$

X _ij(t ₂-dt) be illustrated in t ₂-dt is the decision vector component of the corresponding wireless network j of vehicle i constantly, t ₂for carrying out the moment of step f.Parameter

η _ijfor the white Gaussian noise factor that the average of the corresponding wireless network j of vehicle i is 0, standard deviation is 1;

G, joint radio resource management module are according to decision vector X _i(t ₂), obtain the next time interval of car-mounted terminal on vehicle i (t+dt, t+2 * dt] in the target radio network j of access ^*, as decision information:

$j^{*}=\underset{j\&Element;\mathrm{NetSet}}{\arg \max }\left\{x_{\mathrm{ij}}\left(t_2\right)\right|x_{\mathrm{ij}}\left(t_2\right)\&Element;X_i\left(t_2\right)\}---\left(13\right)$

H, joint radio resource management module are passed through the wired mode of Internet by the car-mounted terminal wireless access decision information j on vehicle i ^*the RRM module of the wireless network j that the car-mounted terminal that sends to vehicle i accesses at t constantly, i ∈ MTset _j, j ∈ NetSet;

Step 5: the RRM module of wireless network j receives the decision information j that the joint radio resource management module sends ^*, by signaling message, be broadcast to the current car-mounted terminal i be connected with wireless network j, i ∈ MTset _j, j ∈ NetSet;

Step 6: many network interface management submodules of car-mounted terminal i receive the wireless access decision information j that signaling message sends ^*, judged, be specially:

If I is j ^*∈ CandidateNetSet _i, many network interfaces of the car-mounted terminal administration module on vehicle i is switched to wireless network j by the port of interconnection network ^*port, and when the next one, ask interval (t+dt, t+2 * dt] in keep and this wireless network j ^*wireless connections, utilize this wireless network j ^*for web applications all on terminal provides business service;

If II

the many network interface management of the car-mounted terminal on vehicle i submodule further judges whether the wireless network j that the constantly many network interface management of t submodule accesses belongs to set CandidateNetSet _iif: j ∈ CandidateNetSet _i, the car-mounted terminal on vehicle i the next time interval (t+dt, t+2 * dt] keep and being connected of this wireless network j; If

the many network interface management of the car-mounted terminal on vehicle i submodule is chosen set CandidateNetSet _ithe wireless network of middle signal strength signal intensity maximum as the next time interval (t+dt, t+2 * dt] access network.

If the car-mounted terminal on III vehicle i is still in wireless network environment and continue to need wireless network that business service is provided, the car-mounted terminal wireless network access module on vehicle i is returned to step 1 at the next one t+dt finish time in the time interval, continues to carry out; Otherwise the car-mounted terminal wireless network access module on vehicle i finishes the inventive method.

Claims (2)

1. the radio switch-in method of the car-mounted terminal for the bus or train route cooperative system is characterized in that: in wireless network environment, and when each vehicle initially enters wireless network environment, the strongest wireless network of car-mounted terminal incoming wireless signal on vehicle; And each vehicle is started constantly by t, carry out a wireless network switching access at interval of time dt, concrete grammar is as follows:

Step 1: at t, constantly obtain the car-mounted terminal information on vehicle;

Making rolling stock number in wireless network environment is n; Vehicles identifications is i, i=1,2,3 ..., n; By the wireless network access module on vehicle i, obtain car-mounted terminal on vehicle i at t car-mounted terminal information constantly, be specially:

A, the wireless signal of launching by AP or the antenna for base station of many each wireless networks of network interface management submodules reception trackside, judge available wireless network according to wireless signal, and available wireless network is formed to accessible wireless network candidate collection CandidateNetSet _i;

B, receive the signaling message of the wireless network j of many network interfaces management submodules access by many network interfaces management submodules, j is wireless network identification, j=1,2,3 ..., m; M is whole wireless network numbers in wireless network environment; Many network interface management submodules also obtain the qos parameter information of wireless network j from the signaling message of wireless network j, comprise the available bandwidth currentNetB of wireless network j _j, wireless transmission time delay currentNetD _jwith network packet loss rate currentNetPLR _j, and by the qos parameter communication of described wireless network j to wireless network QoS information evaluation submodule; Simultaneously, the web application k of the operation of the car-mounted terminal on wireless network QoS information evaluation submodule collection vehicle i _iqoS demand parameter information, comprise network bandwidth requirements index bound parameter

with

wireless transmission time delay demand parameter bound parameter

with

network packet loss rate demand parameter bound parameter

with

k is web application sign, k=1,2,3 ..., p; P is web application quantity;

C, wireless network QoS information evaluation submodule, according to the QoS demand parameter information of the overall network application program of the qos parameter information of wireless network j and the operation of the car-mounted terminal on vehicle i, obtain car-mounted terminal QoS demand upper limit parameter and lower limit parameter on vehicle i; Car-mounted terminal QoS demand upper limit parameter on vehicle i comprises bandwidth demand upper limit parameter MTUpB _i, time delay demand upper limit parameter MTUpD _i, packet loss demand upper limit parameter MTUpPLR _i; Car-mounted terminal QoS demand lower limit parameter on vehicle comprises bandwidth demand lower limit parameter MTLowB _i, time delay demand lower limit parameter MTLowD _i, packet loss demand lower limit parameter MTLowPLR _ifor:

$\left\{\begin{array}{c}{\mathrm{MTUpB}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\mathrm{\&Sigma;}}\mathrm{appUp}{B}_{k_i}\\ {\mathrm{MTLowB}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\mathrm{\&Sigma;}}{\mathrm{appLowB}}_{k_i}\\ {\mathrm{MTUpD}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\min }\left\{{\mathrm{appUpD}}_{k_i}\right\}\\ {\mathrm{MTLowD}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\max }\left\{{\mathrm{appLowD}}_{k_i}\right\}\\ {\mathrm{MTUpPLR}}_i=\underset{k_i{\&Element;\mathrm{ApplicationSet}}_i}{\min }\left\{{\mathrm{appUpPLR}}_{k_i}\right\}\\ {\mathrm{MTLowPLR}}_i=\underset{k_i\&Element;{\mathrm{ApplicationSet}}_i}{\max }\left\{{\mathrm{appLowPLR}}_{k_i}\right\}\end{array}\right.---\left(1\right)$

In formula (1), ApplicationSet _imean the set of the overall network application program formation of the car-mounted terminal operation on vehicle i;

D, wireless network QoS information evaluation submodule, according to car-mounted terminal QoS demand upper limit parameter and lower limit parameter on vehicle i, obtain the car-mounted terminal QoS effectiveness parameter on vehicle i, comprise network bandwidth effectiveness parameter UtilityB _i, propagation delay time effectiveness parameter UtilityD _i, Network Packet Loss effectiveness parameter UtilityPLR _i;

$\left\{\begin{array}{c}{\mathrm{UtilityB}}_i=\frac{\min \{{\mathrm{currentNetB}}_i,{\mathrm{MTUpB}}_i\}-{\mathrm{MTLowB}}_i}{{\mathrm{MTUpB}}_i-{\mathrm{MTLowB}}_i}\\ {\mathrm{UtilityD}}_i=\frac{{\mathrm{MTUpD}}_i-\max \{\mathrm{curren}{\mathrm{tNetD}}_i,{\mathrm{MTLowD}}_i\}}{{\mathrm{MTUpD}}_i-{\mathrm{MTLowD}}_i}\\ {\mathrm{UtilityPLR}}_i=\frac{{\mathrm{MTUpPLR}}_i-\max \{{\mathrm{currentNetPLR}}_i,\mathrm{MTLowP}{\mathrm{LR}}_i\}}{{\mathrm{MTUpPLR}}_i-{\mathrm{MTLowPLR}}_i}\end{array}\right.---\left(2\right)$

E, wireless network QoS information evaluation submodule, according to the car-mounted terminal QoS effectiveness parameter on vehicle i, adopt weighted average method to obtain the car-mounted terminal QoS comprehensive satisfaction MTSatisfaction on vehicle i _i;

MTSatisfaction _i=w ₁×UtilityB _i+w ₂×UtilityD _i+w ₃×UtilityPLR _i (3)

In formula (3), need to meet: w ₁, w ₂, w ₃equal weight coefficients, for being greater than 0 real constant, and w ₁+ w ₂+ w ₃=1;

Car-mounted terminal on F, vehicle i is by the MTUpB obtained _i, UtilityB _iand MTSatisfaction _ias the car-mounted terminal information of vehicle i, by multiple network management reason submodule, by signaling message, be broadcast to the RRM module;

Step 2: the RRM module forms set MTset by the car-mounted terminal on the vehicle i of access of radio network j _j, and utilize set MTset _jmTSatisfaction in car-mounted terminal information on interior vehicle i _i, obtain the QoS value of utility GroupUtility of wireless network j _j;

${\mathrm{GroupUtility}}_j=\underset{i\&Element;{\mathrm{MTset}}_j}{\mathrm{\&Pi;}}(1-\mathrm{MTSatisfactio}{n}_i)---\left(4\right)$

Simultaneously, the RRM module is also utilized set MTset _jmTUpB in the upper car-mounted terminal information of interior vehicle i _i, obtain the bandwidth resource allocation value of utility NetUtilityB of wireless network j _j;

$\left\{\begin{array}{c}{\mathrm{\&Delta;NetB}}_j=\min \{0,({\mathrm{Capacity}}_j-\underset{i\&Element;{\mathrm{MTset}}_j}{\mathrm{\&Sigma;}}{\mathrm{MTUpB}}_i)\}\\ {\mathrm{NetUtilityB}}_j=\frac{2}{1+\exp (-g\&times;{\mathrm{\&Delta;NetB}}_j)}\end{array}\right.---\left(5\right)$

In formula (5), Capacity _jthe bandwidth total capacity that means this wireless network j, according to practical application, the concrete technical standard setting of wireless network j, g is positive real constant;

Step 3: the RRM module is by the GroupUtility obtained _jand NetUtilityB _jand set utilityB in car-mounted terminal information on interior vehicle i _i, by the wired mode of Internet, be transferred to the joint radio resource management module;

Step 4: the target radio network of determining the car-mounted terminal switching access on vehicle i;

The joint radio resource management module forms set NetSet by the whole wireless networks in wireless network environment, and the car-mounted terminal that will access on the vehicle of each wireless network forms car-mounted terminal set MT, the GroupUtility that utilizes subsequently the joint radio resource management module to receive _j, NetUtilityB _jwith the UtilityB in the car-mounted terminal information on vehicle i in set MT _icarry out decision-making, specific as follows:

A, joint radio resource management module are utilized

obtain QoS global satisfying degree parameter GlobalSatisfactio;

$\mathrm{GlobalSatisfaction}=1-\underset{j\&Element;\mathrm{NetSet}}{\mathrm{\&Pi;}}{\mathrm{GroupUtility}}_j---\left(6\right)$

B, joint radio resource management module are utilized parameter N etUtilityB _j, obtain the wireless network bandwidth resource and distribute overall effectiveness parameter GlobalUtilityB;

$\mathrm{GlobalUtilityB}=\underset{j\&Element;\mathrm{NetSet}}{\mathrm{\&Pi;}}{\mathrm{NetUtilityB}}_j---\left(7\right)$

C, joint radio resource management module utilization set MTset _jutilityB in car-mounted terminal information on interior vehicle i _i, obtain the wireless network bandwidth resource and distribute global fair parameter GlobalAllocationFI;

$\left\{\begin{array}{c}\mathrm{FI}=\frac{{\left(\underset{j\&Element;\mathrm{MT}}{\mathrm{\&Sigma;}}{\mathrm{UtilityB}}_i\right)}^2}{\left|\mathrm{MT}\right|\&times;[\underset{j\&Element;\mathrm{MT}}{\mathrm{\&Sigma;}}{\left({\mathrm{UtilityB}}_i\right)}^2}\\ \mathrm{GlobalAllocationFI}=h\left(\mathrm{FI}\right)\end{array}\right.---\left(8\right)$

In formula (8), | MT| means to gather the number of element in MT, and h (Fi) is:

$h\left(\mathrm{FI}\right)=\left\{\begin{array}{c}0;\mathrm{FI}\&le;0\\ \frac{{(2\&times;\mathrm{FI})}^r}{1+{(2\&times;\mathrm{FI})}^r};0<\mathrm{FI}\&le;0.5\\ 1-\frac{{(2-2\&times;\mathrm{FI})}^r}{1+(2-2\&times;\mathrm{FI})};0.5<\mathrm{FI}\&le;1\\ 1;\mathrm{FI}>1\end{array}\right.---\left(9\right)$

In formula (9), r is positive integer, r > 2;

D, joint radio resource management module, finally according to GlobalSatisfa, GlobalUtilityB, GlobalAllocationFI, obtain comprehensive quantification parameter value α (t ₁):

$\left\{\begin{array}{c}\mathrm{\&alpha;}\left(t_1\right)=\mathrm{\&alpha;}(t_1-\mathrm{dt})+\mathrm{dt}\&times;[\mathrm{GAF}-\mathrm{\&alpha;}(t_1-\mathrm{dt})]\\ \mathrm{GAF}=({\mathrm{\&beta;}}_1\&times;\mathrm{GlobalSatisfaction}+{\mathrm{\&beta;}}_2\&times;\mathrm{GlobalAllocationFI})\&times;\mathrm{GlobalUtilityB}\end{array}\right.---\left(10\right)$

In formula (10), α (t ₁-dt) mean t ₁-dt comprehensive quantification parameter value constantly, t ₁for carrying out the moment of steps d; Parameter beta ₁and β ₂need to meet: β ₁+ β ₂=1, and β ₁with β ₂be the real constant that is greater than 0;

E, joint radio resource management module are according to comprehensive quantification parameter alpha (t ₁), utilize multinomial mathematics model to obtain parameter s yn and deg:

$\left\{\begin{array}{c}\mathrm{syn}=\underset{l=0}{\overset{n}{\mathrm{\&Sigma;}}}{a}_l\&times;{\left[\mathrm{\&alpha;}\left(t_1\right)\right]}^l\\ \mathrm{deg}=\mathrm{\&alpha;}\left(t_1\right)\end{array}\right.---\left(11\right)$

In formula (11), parameter n is positive integer; Parameter a _lneed to meet: a _n0 and a _l>=0, l=0,1 ..., n-1, a _lbe real constant;

F, joint radio resource management module, according to parameter s yn and deg, are called car-mounted terminal wireless access decision-making dynamical system model, obtain the decision vector X of corresponding each wireless network of car-mounted terminal on vehicle i _i(t ₂):

X _i(t ₂)=[x _i1(t ₂)，x _i2(t ₂)，x _i3(t ₂)，……，x _ij(t ₂)，……，x _im(t ₂)] ^T，i∈MT (12)

In formula (3),

$x_{\mathrm{ij}}\left(t_2\right)=x_{\mathrm{ij}}(t_2-\mathrm{dt})+\mathrm{dt}\&times;[\frac{\mathrm{syn}}{1+(x_{\max }^i(t_2-\mathrm{dt})-x_{\mathrm{ij}}(t_2-\mathrm{dt}){)}^2}-\mathrm{deg}\&times;x_{\mathrm{ij}}(t_2-\mathrm{dt})+{\mathrm{\&eta;}}_{\mathrm{ij}}];$

X _ij(t ₂-dt) be illustrated in t ₂-dt is the decision vector component of the corresponding wireless network j of vehicle i constantly, t ₂for carrying out the moment of step f; Parameter

η _ijfor the white Gaussian noise factor that the average of the corresponding wireless network j of vehicle i is 0, standard deviation is 1;

G, joint radio resource management module are according to decision vector X _i(t ₂), obtain the next time interval of car-mounted terminal on vehicle i (t+dt, t+2 * dt] in the target radio network j of access ^*, as decision information:

$j^{*}=\underset{j\&Element;\mathrm{NetSet}}{\arg \max }\left\{x_{\mathrm{ij}}\left(t_2\right)\right|x_{\mathrm{ij}}\left(t_2\right)\&Element;X_i\left(t_2\right)\}---\left(13\right)$

H, joint radio resource management module are passed through the wired mode of Internet by the car-mounted terminal wireless access decision information j on vehicle i ^*the RRM module of the wireless network j that the car-mounted terminal that sends to vehicle i accesses at t constantly, i ∈ MTset _j, j ∈ NetSet;

Step 5: the RRM module of wireless network j receives the decision information j that the joint radio resource management module sends ^*, by signaling message, be broadcast to the current car-mounted terminal i be connected with wireless network j, i ∈ MTset _j, j ∈ NetSet;

Step 6: the many network interface management of the car-mounted terminal on vehicle i submodule receives the wireless access decision information j that signaling message sends ^*, judged, be specially:

If I is j ^*∈ CandidateNetSet _i, many network interfaces of the car-mounted terminal administration module on vehicle i is switched to wireless network j by the port of interconnection network ^*port, and the next time interval (t+dt, t+2 * dt] in keep and this wireless network j ^*wireless connections, utilize this wireless network j ^*for web applications all on terminal provides business service;

If II the many network interface management of the car-mounted terminal on vehicle i submodule further judges whether the wireless network j that the constantly many network interface management of t submodule accesses belongs to set CandidateNetSet _iif: j ∈ CandidateNetSet _i, the car-mounted terminal on vehicle i the next time interval (t+dt, t+2 * dt] keep and being connected of this wireless network j; If

the many network interface management of the car-mounted terminal on vehicle i submodule is chosen set CandidateNetSet _ithe wireless network of middle signal strength signal intensity maximum as the next time interval (t+dt, t+2 * dt] access network;

If the car-mounted terminal on III vehicle i is still in wireless network environment and continue to need wireless network that business service is provided, the wireless network access module of this car-mounted terminal i next finish time in the time interval t+dt return to step 1, continue to carry out; Otherwise, the car-mounted terminal wireless network access module termination work on vehicle i.

2. a kind of radio switch-in method of the car-mounted terminal for the bus or train route cooperative system as claimed in claim 1, it is characterized in that: the wireless network access module of described many network interfaces management submodules and wireless network QoS information evaluation submodule is deployed on car-mounted terminal; The RRM module is deployed in the AP or base station of wireless network of trackside; The joint radio resource management module is deployed in the Internet network.

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