CN103476091B - A kind of car-mounted terminal radio switch-in method for bus or train route cooperative system - Google Patents

Abstract

The present invention discloses a kind of car-mounted terminal radio switch-in method for bus or train route cooperative system, wireless network AM access module is disposed at car-mounted terminal, trackside wireless network AP or base station deployment radio resource management module, Internet network sidepiece administration joint radio resource management module；Respectively by signaling message, Internet wire transmission exchange information between car-mounted terminal and radio resource management module, between radio resource management module and joint radio resource management module；By car-mounted terminal, radio resource management module and joint radio resource management module cooperative decision-making, QoS global satisfying degree, Internet resources distribution overall situation effectiveness and fairness are comprehensively become a quantization parameter, solves the decision information of the dynamical system model acquisition wireless access of the present invention with this driving parameter.Application the inventive method can provide the car-mounted terminal radio access scheme of dynamic self-adapting change of network environment from the comprehensive angle ensureing QoS global satisfying degree, Internet resources distribution overall situation benefit and fairness.

Description

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

Technical field

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

Background technology

Automobile and field of traffic are the typical field of application of wireless network, and car-mounted terminal becomes the mobile communication that a class is important Terminal.With " Che-car (Vehicle-to-Vehicle, V2V) " and " Che-road (Vehicle-to-Infrastructure, V2I) bus or train route cooperative system (the Cooperative Vehicle and based on the information that " carries out between radio communication device is mutual Infrastructure System, CVIS), in order to effectively provide information service for car-mounted terminal, it is achieved people, car, road integration Information reconciliation cooperation, bus or train route cooperative system depend heavilys on plurality of wireless networks technology and carrys out application deployment.On the other hand, adjoint The high speed development of various wireless communication technology and the widespread deployment of wireless network infrastructure, in many communication scenes, no Coexist in a large number superimposition lid of laying equal stress on, such as 3G (3rd-Generation, G mobile communication) honeycomb with the network of type Network, WiFi (Wireless Fidelity, adopting wireless fidelity technology) wireless network, DSRC (Dedicated Short Range Communications, DSRC technology), On Satellite-earth Microwave Communication network etc. together form many nets environment of complexity, Variation transfer function is provided for information interactive process between car-mounted terminal and trackside facility in bus or train route cooperative system.Thus, In wireless network environment, development, for the wireless access technology of bus or train route cooperative system, selects preferably to access for car-mounted terminal Network, effectively utilizes the web application that different radio network techniques is car-mounted terminal and provides reliable information service, Consider that global assignment benefit and the fairness in distribution of Internet resources become particularly significant simultaneously.

But, the wireless access technology being applied to bus or train route cooperative system faces from web application QoS (Quality Of Service) diversified demand, wireless network environment isomerism and dynamic, car-mounted terminal gregariousness and access network also The challenge of the aspects such as the property sent out:

First, from the point of view of concrete application demand, the demand that bus or train route is communicated by application programs different on car-mounted terminal is mutual Differ, such as, in terms of many aspects of vehicle safety applications, possess between transmission requirement " Che-car " or " Che-road " of train safety information Low time delay, highly reliable communication performance；In terms of traffic control, car-mounted terminal needs to utilize wireless network by the real-time shape of vehicle State information (such as exhaust emissions amount, fuel consumption etc.) is transferred to background data center, and for inline diagnosis analysis, this requires logical Communication network can provide high data rate, the transmission performance of enough bandwidth for real time data；In non-security application aspect, such as exist The real-time or non real-time on-vehicle information entertainment program pair such as line video playback, voice transfer, web page browsing or transmitting-receiving E-mail The QoS demand of network is the most different.Therefore, the QoS demand of heterogeneous networks application program on effective coordination car-mounted terminal, comprehensively Quantify these different QoS demand indexs, and select accordingly rational access network to ensure communication service, become current and Future development bus or train route cooperative system wireless access technology needs the major issue considered.

Secondly, from the point of view of concrete technical standard, the wireless network being applied to bus or train route cooperative system bus or train route communication is relied on Consensus standard different, such as, WLANs (Wireless Local Area Networks) supports IEEE802.11a/b/ G/n/p standard, WiMAX (World Interoperability for Microwave Access) supports IEEE802.16a/e Standard, 3G includes the standards such as CDMA2000, WCDMA, TD-SCDMA.Network technology under various criterion is carrying for car-mounted terminal During for communication service, service quality is largely by network QoS characteristics such as such as bandwidth capacity, packet loss, delay variations Impact；Meanwhile, along with car-mounted terminal flowing to and flowing out in wireless network signal overlay area, network is supplied to each The available bandwidth of individual car-mounted terminal dynamically changes also with the number of users of access network, and, network QoS characteristic also can be because of Dynamically change for the disturbance of deployed environment.Thus, the wireless access technology being applied in 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 dynamically change of network environment to ensure the QoS demand of terminal.

Additionally, in the case of traffic flow is than comparatively dense, a large amount of car-mounted terminals present clustering feature, and each is eventually Run multiple different web application on end simultaneously.Therefore, car-mounted terminal colony and substantial amounts of application program concurrency Ground accesses Internet resources, causes the Radio Resource warfare of fierceness.

Thus, how to successfully manage in bus or train route cooperative system the Radio Resource keen competition existing for bus or train route communication process, The challenge that the factors such as network environment dynamically changes, car-mounted terminal concurrently access is constituted, is that currently to set up car-mounted terminal wireless The urgent needs of cut-in method.

Summary of the invention

For overcoming existing wireless access technology can not consider wireless network resource keen competition, network environment dynamically becomes The defect of the factors such as change, car-mounted terminal concurrently access, it is wireless that the present invention proposes a kind of car-mounted terminal for bus or train route cooperative system Cut-in method；Different from traditional wireless access technology, the inventive method is by the RRM of car-mounted terminal with trackside Module and joint radio resource management module cooperative decision-making, by the QoS global satisfying degree of car-mounted terminal, wireless network resource distribution Overall effectiveness and global fair comprehensively become a quantization parameter, utilize this comprehensive quantification driving parameter to solve the inventive method The dynamical system model proposed, using the equilibrium solution of dynamical system vector as decision vector, therefrom obtains that car-mounted terminal is wireless to be connect The decision information entered, be one possess service truck mounted terminal QoS global satisfying degree, wireless network resource distribution the overall situation benefit and Global fair sexuality, the wireless network environment that is simultaneous for change there is the radio access scheme of dynamic self-adapting characteristic.

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

Step 1: obtain the car-mounted terminal information on vehicle in t；

Making rolling stock number in wireless network environment is n；Vehicles identifications be i, i=1,2,3 ..., n；Then pass through car Wireless network AM access module on i, obtains the car-mounted terminal information in t of the car-mounted terminal on vehicle i, particularly as follows:

The wireless communication that A, the AP being received each wireless network of trackside by many network interfaces management submodule or antenna for base station are launched Number, judge available wireless network according to wireless signal, and available wireless network is constituted accessible wireless network candidate Set CandidateNetSet_i；

B, the signaling of the wireless network j being received the management submodule access of many network interfaces by many network interfaces management submodule are disappeared Breath, j is wireless network identification, j=1,2,3 ..., m；M is whole wireless network numbers in wireless network environment；Many nets connect Mouth management submodule also obtains the qos parameter information of wireless network j from the signaling message of wireless network j, including wireless network j Available bandwidth currentNetB_j, be wirelessly transferred time delay currentNetD_jWith network packet loss rate currentNetPLR_j, and will The qos parameter information of described wireless network j is transferred to wireless network QoS information assessment submodule；Meanwhile, wireless network QoS letter The web application k that car-mounted terminal in breath assessment submodule collection vehicle i runs_iQoS demand indication information, including net Network bandwidth demand index bound parameterWithIt is wirelessly transferred delay requirement index bound parameterWithNetwork packet loss rate demand parameter bound parameterWithK is network Application program identification, k=1,2,3 ..., p；P is web application quantity；

Vehicle-mounted according in the qos parameter information of wireless network j and vehicle i of C, wireless network QoS information assessment submodule The QoS demand indication information of the overall network application program of terminal operating, obtains the car-mounted terminal QoS demand upper limit on vehicle i Parameter and lower limit parameter；Car-mounted terminal QoS demand upper limit parameter on vehicle i comprises bandwidth demand upper limit parameter MTUpB_i, time Prolong demand upper limit parameter MTUpD_i, packet loss demand upper limit parameter MTUpPLR_i；Car-mounted terminal QoS demand lower limit ginseng on vehicle Number comprises bandwidth demand lower limit parameter MTLowB_i, delay requirement 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_iRepresent the overall network application program structure that the car-mounted terminal on vehicle i runs The set become；

D, wireless network QoS information assessment submodule is according to the car-mounted terminal QoS demand upper limit parameter on vehicle i and lower limit Parameter, obtains the car-mounted terminal QoS effectiveness parameter on vehicle i, including 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 assessment submodule, according to the car-mounted terminal QoS effectiveness parameter on vehicle i, uses weighting Averaging method obtains the car-mounted terminal QoS comprehensive satisfaction MTSatisfaction on vehicle i_i；

MTSatisfaction_i=w₁×UtilityB_i+w₂×UtilityD_i+w₃×UtilityPLR_i (3)

In formula (3), need to meet: w₁、w₂、w₃All weight coefficients, for the real constant more than 0, and w₁+w₂+w₃=1；

The MTUpB that car-mounted terminal on F, vehicle i will obtain_i、UtilityB_iAnd MTSatisfaction_iAs vehicle i Car-mounted terminal information, by multiple network management reason submodule be broadcast to radio resource management module by signaling message.

Step 2: the car-mounted terminal on the vehicle i accessing wireless network j is constituted set by radio resource management module MTset_j, and utilize set MTset_jThe MTSatisfaction in car-mounted terminal information on interior vehicle i_i, obtain wireless network The QoS value of utility GroupUtility of j_j；

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

Meanwhile, radio resource management module also utilizes set MTset_jIn the upper car-mounted terminal information of interior vehicle i MTUpB_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_jRepresent the bandwidth total capacity of this wireless network j, apply according to reality, wireless network j's Concrete technical standard is arranged, and g is positive real constant.

Step 3: the GroupUtility that radio resource management module will obtain_jAnd NetUtilityB_jAnd set MTset_jThe UtilityB in car-mounted terminal information on interior vehicle i_i, it is transferred to associating nothing by the wired mode of Internet Line resource management module.

Step 4: determine the target radio network that the car-mounted terminal switching on vehicle i accesses；

Whole wireless networks in wireless network environment are constituted set NetSet by joint radio resource management module, and will Access the car-mounted terminal on the vehicle of each wireless network and constitute car-mounted terminal set MT, followed by joint radio resource management The GroupUtility that module receives_j、NetUtilityB_jWith in the car-mounted terminal information on vehicle i in set MT UtilityB_iCarry out decision-making, specific as follows:

A, joint radio resource management module utilize GroupUtility_J,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 utilize parameter NetUtilityB_j, obtain the distribution of wireless network bandwidth resource complete Office's effectiveness parameter GlobalUtilityB；

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

C, joint radio resource management module utilize set MTset_jIn car-mounted terminal information on interior vehicle i UtilityB_i, obtain wireless network bandwidth resource distribution 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 | represents the number of element in set 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, obtains comprehensive quantification parameter value α (t₁):

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

In formula (10), α (t₁-dt) represent t₁The comprehensive quantification parameter value in-dt moment, t₁For carrying out the moment of step d；Ginseng Number β₁And β₂Need to meet: β₁+β₂=1, and β₁With β₂It is the real constant more than 0；

E, joint radio resource management module are according to comprehensive quantification parameter alpha (t₁), utilize polynomial mathematical model to be joined Number syn 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_lIt is Real constant；

F, joint radio resource management module, according to parameter syn and deg, call car-mounted terminal wireless access decision-making dynamical system System model, obtains the decision vector X of each wireless network corresponding of the car-mounted terminal on vehicle i_i(t₂):

X_i(t₂)=[x_i1(t₂), x_i2(t₂), x_i3(t₂) ..., x_ij(t₂) ..., x_im(t₂)]^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(t₂-dt) represent at t₂The decision vector component of-dt moment vehicle i correspondence wireless network j, t₂For carrying out step f Moment；Parameterη_ijFor the average of vehicle i correspondence wireless network j be 0, standard deviation It it is the white Gaussian noise factor of 1；

G, joint radio resource management module are according to decision vector X_i(t₂), when obtaining the car-mounted terminal next one on vehicle i Between be spaced (t+dt, t+2 × dt] in access target radio network j^*, 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 connect wireless for the car-mounted terminal on vehicle i by the wired mode of Internet Enter decision information i and be sent to the radio resource management module of the wireless network j that the car-mounted terminal of vehicle i is accessed in t, i ∈MTset_j, j ∈ NetSet.

Step 5: the radio resource management module of wireless network j receives the decision-making letter that joint radio resource management module sends Breath j^*, car-mounted terminal i, the i ∈ MTset being currently connected it is broadcast to wireless network j by signaling message_j, j ∈ NetSet.

Step 6: the car-mounted terminal many network interfaces management submodule on vehicle i receives the wireless access of signaling message transmission certainly Plan information j^*, judge, particularly as follows:

If I is j^*∈CandidateNetSet_i, then the management of the car-mounted terminal many network interfaces on vehicle i module will connect net The port of network is switched to wireless network j^*Port, and next time interval (t+dt, t+2 × dt] in keep wireless with this Net j^*Wireless connections, utilize this wireless network j^*Business service is provided for all of web application in terminal；

If IIThen the management of the car-mounted terminal many network interfaces on vehicle i submodule is sentenced further Whether the wireless network j that disconnected t many network interfaces management submodule is accessed belongs to set CandidateNetSet_iIf: j ∈CandidateNetSet_i, then the car-mounted terminal on vehicle i next time interval (t+dt, t+2 × dt] keep with should The connection of wireless network j；IfThen the management of the car-mounted terminal many network interfaces on vehicle i submodule chooses collection Close CandidateNetSet_iThe maximum wireless network of middle signal intensity as next time interval (t+dt, t+2 × dt] Access network；

If the car-mounted terminal on III vehicle i is still within wireless network environment and continues need for wireless network offer industry Business service, then the wireless network AM access module of this car-mounted terminal i returns step 1 at next time interval finish time t+dt, Continue executing with；Otherwise, the car-mounted terminal wireless network AM access module termination work on vehicle i.

It is an advantage of the current invention that:

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

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

3, the present invention is implementing vehicle-mounted end for the car-mounted terminal radio switch-in method of bus or train route cooperative system, the inventive method During end wireless access, not only from the network service quality of the interests angle service truck mounted terminal of the network user, the most comprehensively examine Utilization benefit and the fairness in distribution of Internet resources, the problem successfully managing Internet resources keen competition with this are considered；

4, the present invention is for the car-mounted terminal radio switch-in method of bus or train route cooperative system, and the QoS introducing car-mounted terminal is comprehensive Satisfaction parameter makes car-mounted terminal wireless access decision making process possess the reasonability of Logistics networks user's QoS benefit.

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.

Detailed description of the invention

The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.

A kind of car-mounted terminal radio switch-in method for bus or train route cooperative system of the present invention, disposes on car-mounted terminal and comprises Many network interfaces management submodule and the wireless network AM access module of wireless network QoS information assessment submodule, wireless at trackside Network AP or base station deployment radio resource management module, dispose joint radio resource management module in Internet network； Disappeared by the signaling of air interface between many network interfaces management submodule and the radio resource management module of trackside of car-mounted terminal Breath decision-making information；By Internet's between radio resource management module and the joint radio resource management module of trackside Wire transmission mode decision-making information；As shown in Figure 1.In wireless network environment, each vehicle initially enters wireless network During environment, the wireless network that car-mounted terminal incoming wireless signal on vehicle is the strongest；And each vehicle is by t, every Interval dt carries out a wireless network switching and accesses, as in figure 2 it is shown, concrete grammar is as follows:

Step 1: obtain the car-mounted terminal information on vehicle in t；

Making rolling stock number in wireless network environment is n；Vehicles identifications be i, i=1,2,3 ..., n；Then pass through Wireless network AM access module on vehicle i, obtains the car-mounted terminal information in t of the car-mounted terminal on vehicle i, particularly as follows:

The wireless communication that A, the AP being received each wireless network of trackside by many network interfaces management submodule or antenna for base station are launched Number, judge available wireless network according to wireless signal, and available wireless network is constituted accessible wireless network candidate Set CandidateNetSet_i；

B, the signaling of the wireless network j being received the management submodule access of many network interfaces by many network interfaces management submodule are disappeared Breath, j is wireless network identification, j=1,2,3 ..., m；M is whole wireless network numbers in wireless network environment；Many nets connect Mouth management submodule also obtains the qos parameter information of wireless network j from the signaling message of wireless network j, including wireless network j Available bandwidth currentNetB_j, be wirelessly transferred time delay currentNetD_jWith network packet loss rate currentNetPLR_j, and will The qos parameter information of described wireless network j is transferred to wireless network QoS information assessment submodule；Meanwhile, wireless network QoS letter The web application k that car-mounted terminal in breath assessment submodule collection vehicle i runs_iQoS demand indication information, including net Network bandwidth demand index bound parameterWithIt is wirelessly transferred delay requirement index bound parameterWithNetwork packet loss rate demand parameter bound parameterWithK is network Application program identification, k=1,2,3 ..., p；P is web application quantity.

Vehicle-mounted according in the qos parameter information of wireless network j and vehicle i of C, wireless network QoS information assessment submodule The QoS demand indication information of the overall network application program of terminal operating, obtains the car-mounted terminal QoS demand upper limit on vehicle i Parameter and lower limit parameter；Wherein, the car-mounted terminal QoS demand upper limit parameter on vehicle i includes bandwidth demand upper limit parameter MTUpB_i, delay requirement upper limit parameter MTUpD_i, packet loss demand upper limit parameter MTUpPLR_i；Car-mounted terminal QoS on vehicle needs Lower limit parameter is asked to include bandwidth demand lower limit parameter MTLowB_i, delay requirement lower limit parameter MTLowD_i, packet loss demand lower limit ginseng Number 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_iRepresent the overall network application program structure that the car-mounted terminal on vehicle i runs The set become.

D, wireless network QoS information assessment submodule is according to the car-mounted terminal QoS demand upper limit parameter on vehicle i and lower limit Parameter, obtains the car-mounted terminal QoS effectiveness parameter on vehicle i, including 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 assessment submodule, according to the car-mounted terminal QoS effectiveness parameter on vehicle i, uses weighting Averaging method obtains the car-mounted terminal QoS comprehensive satisfaction MTSatisfaction on vehicle i_i；

MTSatisfaction_i=w₁×UtilityB_i+w₂×UtilityD_i+w₃×UtilityPLR_i (3)

In formula (3), need to meet: w₁、w₂、w₃All weight coefficients, for the real constant more than 0, and w₁+w₂+w₃=1, according to this The concrete application scenarios of inventive method is arranged, and takes

The MTUpB that car-mounted terminal on F, vehicle i will obtain_i、UtilityB_iAnd MTSatisfaction_iAs vehicle i Car-mounted terminal information, by multiple network management reason submodule be broadcast to radio resource management module by signaling message.

Step 2: the car-mounted terminal on the vehicle i accessing wireless network j is constituted set by radio resource management module MTset_j, and utilize set MTset_jMTSatisfaction in car-mounted terminal information on interior vehicle i_i, obtain wireless network j QoS value of utility GroupUtility_j；

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

Radio resource management module also utilizes set MTset simultaneously_jMTUpB in car-mounted terminal information on interior vehicle i_i, Bandwidth resource allocation value of utility NetUtilityB to 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_jRepresent the bandwidth total capacity of this wireless network j, apply according to reality, wireless network j's Concrete technical standard is arranged, and g is positive real constant, arranges according to the concrete application scenarios of the present invention, takes g=10.

Step 3: the GroupUtility that radio resource management module will obtain_jAnd NetUtilityB_jAnd set MTset_jUtilityB in the interior car-mounted terminal information on vehicle i_i, it is transferred to associating nothing by the wired mode of Internet Line resource management module；

Step 4: determine that the switching of vehicle i accesses wireless network；

Whole wireless networks in wireless network environment are constituted set NetSet by joint radio resource management module, and will Access the car-mounted terminal on the vehicle of each wireless network and constitute car-mounted terminal set MT, followed by joint radio resource management The GroupUtility that module receives_j、NetUtilityB_jWith set MT in vehicle i on car-mounted terminal information in UtilityB_iCarry out decision-making, specific as follows:

A, joint radio resource management module utilize GroupUtility_j, 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 utilize parameter NetUtilityB_j, obtain the distribution of wireless network bandwidth resource complete Office's effectiveness parameter GlobalUtilityB；

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

C, joint radio resource management module utilize set MTset_jIn the interior car-mounted terminal information on vehicle i UtilityB_i, obtain wireless network bandwidth resource distribution 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 | represents the number of element in set 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, arranges according to the concrete application scenarios of the present invention, takes r=5.

D, joint radio resource management module finally according to GlobalSatisfa, GlobalUtilityB, GlobalAllocationFI, obtains comprehensive quantification parameter value α (t₁):

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

In formula (10), α (t₁-dt) represent t₁The comprehensive quantification parameter value in-dt moment, t₁For carrying out the moment of step d；Ginseng Number β₁And β₂Need to meet: β₁+β₂=1, and β₁With β₂It is the real constant more than 0, according to the concrete application scenarios of the inventive method Arrange, take

E, joint radio resource management module are according to comprehensive quantification parameter alpha (t₁), utilize polynomial mathematical model to be joined Number syn 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_lIt is reality Constant, can arrange according to the concrete application scenarios of the inventive method, take n=4, a₄=8, a₁=10, a₀=a₂=a₃=0.

F, joint radio resource management module, according to parameter syn and deg, call car-mounted terminal wireless access decision-making dynamical system System model, obtains the decision vector X of each wireless network corresponding of the car-mounted terminal on vehicle i_i(t₂):

X_i(t₂)=[x_i1(t₂), x_i2(t₂), x_i3(t₂) ..., x_ij(t₂) ..., x_im(t₂)]^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(t₂-dt) represent at t₂The decision vector component of-dt moment vehicle i correspondence wireless network j, t₂For carrying out step f Moment.Parameterη_ijFor the average of vehicle i correspondence wireless network j be 0, standard deviation It it is the white Gaussian noise factor of 1；

G, joint radio resource management module are according to decision vector X_i(t₂), when obtaining the car-mounted terminal next one on vehicle i Between be spaced (t+dt, t+2 × dt] in access target radio network j^*, 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 connect wireless for the car-mounted terminal on vehicle i by the wired mode of Internet Enter decision information j^*It is sent to the radio resource management module of the wireless network j that the car-mounted terminal of vehicle i is accessed, i in t ∈MTset_j, j ∈ NetSet；

Step 5: the radio resource management module of wireless network j receives the decision-making letter that joint radio resource management module sends Breath j^*, car-mounted terminal i, the i ∈ MTset being currently connected it is broadcast to wireless network j by signaling message_j, j ∈ NetSet；

Step 6: many network interfaces management submodule of car-mounted terminal i receives the wireless access decision information that signaling message sends j^*, judge, particularly as follows:

If I is j^*∈CandidateNetSet_i, then the management of the car-mounted terminal many network interfaces on vehicle i module will connect net The port of network is switched to wireless network j^*Port, and ask when the next one interval (t+dt, t+2 × dt] in keep wireless with this Net j^*Wireless connections, utilize this wireless network j^*Business service is provided for all of web application in terminal；

If IIThen the management of the car-mounted terminal many network interfaces on vehicle i submodule is sentenced further Whether the wireless network j that disconnected t many network interfaces management submodule is accessed belongs to set CandidateNetSet_iIf: j ∈CandidateNetSet_i, then the car-mounted terminal on vehicle i next time interval (t+dt, t+2 × dt] keep with should The connection of wireless network j；IfThen the management of the car-mounted terminal many network interfaces on vehicle i submodule chooses collection Close CandidateNetSet_iThe maximum wireless network of middle signal intensity as next time interval (t+dt, t+2 × dt] Access network.

If the car-mounted terminal on III vehicle i is still within wireless network environment and continues need for wireless network offer industry Business service, then the car-mounted terminal wireless network AM access module on vehicle i returns step at next time interval finish time t+dt Rapid 1, continue executing with；Otherwise, the car-mounted terminal wireless network AM access module on vehicle i terminates the inventive method.

Claims (2)

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

Step 1: obtain the car-mounted terminal information on vehicle in t；

Making rolling stock number in wireless network environment is n；Vehicles identifications be i, i=1,2,3 ..., n；Then by vehicle i On wireless network AM access module, obtain the car-mounted terminal information in t of the car-mounted terminal on vehicle i, particularly as follows:

The wireless signal that A, the AP being received each wireless network of trackside by many network interfaces management submodule or antenna for base station are launched, root Judge available wireless network according to wireless signal, and available wireless network is constituted accessible wireless network candidate collection CandidateNetSet_i；

B, the signaling message of the wireless network j accessed by many network interfaces management submodule reception many network interfaces management submodule, j For wireless network identification, j=1,2,3 ..., m；M is whole wireless network numbers in wireless network environment；Many network interfaces pipe Reason submodule also from the signaling message of wireless network j obtain wireless network j qos parameter information, including wireless network j can Use bandwidth currentNetB_j, be wirelessly transferred time delay currentNetD_jWith network packet loss rate currentNetPLR_j, and by described The qos parameter information of wireless network j is transferred to wireless network QoS information assessment submodule；Meanwhile, wireless network QoS information is commented Estimate the web application k that the car-mounted terminal in submodule collection vehicle i runs_iQoS demand indication information, including Netowrk tape Wide demand parameter bound parameterWithIt is wirelessly transferred delay requirement index bound parameterWithNetwork packet loss rate demand parameter bound parameterWithK is web application mark Know, k=1,2,3 ..., p；P is web application quantity；

C, wireless network QoS information assessment submodule is according to the car-mounted terminal in the qos parameter information of wireless network j and vehicle i The QoS demand indication information of the overall network application program run, obtains the car-mounted terminal QoS demand upper limit parameter on vehicle i With lower limit parameter；Car-mounted terminal QoS demand upper limit parameter on vehicle i comprises bandwidth demand upper limit parameter MTUpB_i, time delay need Seek upper limit parameter MTUpD_i, packet loss demand upper limit parameter MTUpPLR_i；Car-mounted terminal QoS demand lower limit parameter bag on vehicle Containing bandwidth demand lower limit parameter MTLowB_i, delay requirement lower limit parameter MTLowD_i, packet loss demand lower limit parameter MTLowPLR_i For:

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

In formula (1), ApplicationSet_iRepresent the collection that the overall network application program that the car-mounted terminal on vehicle i runs is constituted Close；

D, wireless network QoS information assessment submodule is joined with lower limit according to the car-mounted terminal QoS demand upper limit parameter on vehicle i Number, obtains the car-mounted terminal QoS effectiveness parameter on vehicle i, including network bandwidth effectiveness parameter UtilityB_i, propagation delay time effect Use parameter UtilityD_i, Network Packet Loss effectiveness parameter UtilityPLR_i；

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

E, wireless network QoS information assessment submodule, according to the car-mounted terminal QoS effectiveness parameter on vehicle i, uses weighted average Method obtains the car-mounted terminal QoS comprehensive satisfaction MTSatisfaction on vehicle i_i；

MTSatisfaction_i=w₁×UtilityB_i+w₂×UtilityD_i+w₃×UtilityPLR_i (3)

In formula (3), need to meet: w₁、w₂、w₃It is all weight coefficient, for the real constant more than 0, and w₁+w₂+w₃=1；

The MTUpB that car-mounted terminal on F, vehicle i will obtain_i、UtilityB_iAnd MTSatisfaction_iCar as vehicle i Mounted terminal information, is broadcast to radio resource management module by multiple network management reason submodule by signaling message；

Step 2: the car-mounted terminal on the vehicle i accessing wireless network j is constituted set MTset by radio resource management module_j, and Utilize set MTset_jThe MTSatisfaction in car-mounted terminal information on interior vehicle i_i, obtain the QoS effect of wireless network j With value GroupUtility_j；

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

Meanwhile, radio resource management module also utilizes set MTset_jMTUpB 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_jRepresenting the bandwidth total capacity of this wireless network j, apply according to reality, wireless network j's is concrete Technical standard, arranging g is positive real constant；

Step 3: the GroupUtility that radio resource management module will obtain_jAnd NetUtilityB_jAnd set MTset_jIn The UtilityB in car-mounted terminal information on vehicle i_i, it is transferred to combined wireless resource pipe by the wired mode of Internet Reason module；

Step 4: determine the target radio network that the car-mounted terminal switching on vehicle i accesses；

Whole wireless networks in wireless network environment are constituted set NetSet by joint radio resource management module, and will access Car-mounted terminal on the vehicle of each wireless network constitutes car-mounted terminal set MT, followed by joint radio resource management module The GroupUtility received_j、NetUtilityB_jWith the UtilityB in the car-mounted terminal information on vehicle i in set MT_i Carry out decision-making, specific as follows:

A, joint radio resource management module utilize GroupUtility_j, obtain QoS global satisfying degree parameter GlobalSatisfaction；

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

B, joint radio resource management module utilize parameter NetUtilityB_j, obtain wireless network bandwidth resource distribution overall situation effect Use parameter GlobalUtilityB；

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

C, joint radio resource management module utilize set MTset_jThe UtilityB in car-mounted terminal information on interior vehicle i_i, Obtain wireless network bandwidth resource distribution global fair parameter GlobalAllocationFI；

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

In formula (8), | MT | represents the number of element in set MT, and h (FI) is:

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

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

D, joint radio resource management module finally according to GlobalSatisfaction, GlobalUtilityB, GlobalAllocationFI, obtains comprehensive quantification parameter value α (t₁):

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

In formula (10), α (t₁-dt) represent t₁The comprehensive quantification parameter value in-dt moment, t₁For carrying out the moment of step d；Parameter beta₁With β₂Need to meet: β₁+β₂=1, and β₁With β₂It is the real constant more than 0；

E, joint radio resource management module are according to comprehensive quantification parameter alpha (t₁), utilize polynomial mathematical model to obtain parameter syn And deg:

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

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_lIt is real normal Number；

F, joint radio resource management module, according to parameter syn and deg, call car-mounted terminal wireless access decision-making dynamical system mould Type, obtains the decision vector X of each wireless network corresponding of the car-mounted terminal on vehicle i_i(t₂):

X_i(t₂)=[x_i1(t₂),x_i2(t₂),x_i3(t₂),......,x_ij(t₂),......,x_im(t₂)]^T, i ∈ MT (12)

In formula (12),

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

x_ij(t₂-dt) represent at t₂The decision vector component of-dt moment vehicle i correspondence wireless network j, t₂For carry out step f time Carve；Parameterη_ijFor the average of vehicle i correspondence wireless network j be 0, standard deviation be 1 The white Gaussian noise factor；

G, joint radio resource management module are according to decision vector X_i(t₂), obtain between the car-mounted terminal next one time on vehicle i Every (t+dt, t+2 × dt] the interior target radio network j* accessed, as decision information:

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

H, joint radio resource management module are by the wired mode of Internet by the car-mounted terminal wireless access on vehicle i certainly Plan information j^*It is sent to the radio resource management module of the wireless network j that the car-mounted terminal of vehicle i is accessed, i ∈ in t MTset_j, j ∈ NetSet；

Step 5: the radio resource management module of wireless network j receives decision information j that joint radio resource management module sends^*, Car-mounted terminal i, the i ∈ MTset being currently connected it is broadcast to wireless network j by signaling message_j, j ∈ NetSet；

Step 6: the car-mounted terminal many network interfaces management submodule on vehicle i receives the wireless access decision-making letter that signaling message sends Breath j^*, judge, particularly as follows:

If I j^*∈CandidateNetSet_i, then the management of the car-mounted terminal many network interfaces on vehicle i module will connect network Port is switched to wireless network j^*Port, and next time interval (t+dt, t+2 × dt] in keep and this wireless network j^*Wireless connections, utilize this wireless network j^*Business service is provided for all of web application in terminal；

If IIWhen then the management of the car-mounted terminal many network interfaces on vehicle i submodule determines whether t Carve whether many network interfaces management wireless network j of being accessed of submodule belongs to set CandidateNetSet_iIf: j ∈ CandidateNetSet_i, then the car-mounted terminal on vehicle i next time interval (t+dt, t+2 × dt] keep and this nothing The connection of gauze network j；IfThen the management of the car-mounted terminal many network interfaces on vehicle i submodule chooses set CandidateNetSet_iThe maximum wireless network of middle signal intensity as next time interval (t+dt, t+2 × dt] connect Enter network；

If the car-mounted terminal on Ш vehicle i is still within wireless network environment and continues need for wireless network offer business clothes Business, then the wireless network AM access module of this car-mounted terminal i returns step 1 at next time interval finish time t+dt, continues Perform；Otherwise, the car-mounted terminal wireless network AM access module termination work on vehicle i.

A kind of car-mounted terminal radio switch-in method for bus or train route cooperative system, it is characterised in that: institute The wireless network AM access module stating many network interfaces management submodule and wireless network QoS information assessment submodule is deployed in vehicle-mounted end On end；Radio resource management module is deployed in AP or the base station of the wireless network of trackside；Joint radio resource management module It is deployed in Internet network.