CN108430082A - A kind of In-vehicle networking switching method under isomery car networking environment - Google Patents
A kind of In-vehicle networking switching method under isomery car networking environment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
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Abstract
The invention discloses the In-vehicle networking switching methods under a kind of isomery car networking environment, belong to car networking field of communication technology.The method constructs in vehicle mobile terminals vehicle-mounted user for the assessment utility function of cordless communication network first；Then the network switching decision model under the heuristic isomery car networking environment of biology is established；Finally use the optimal network accessed after multiple attributive decision making method selection switching.The present invention has considered the QoS demand condition of vehicular applications in the handling capacity factor and different vehicle mobile terminals of heterogeneous network environment, the rapid vehicle-carrying communication environment for adapting to dynamic change, comparatively fast reach global optimum, effectively prevent " ping-pong " in tradition switching theory, so that network switching is more intelligent, adaptivity and robustness with height；The present invention takes full advantage of the advantage of biocenose intelligence computation, maintains the fairness of global network resource allocation and has ensured the global benefit of limited Internet usage.
Description
Technical field
The invention belongs to car networking fields of communication technology, are related to a kind of biological intelligence method for switching network, specifically, being
Refer to the In-vehicle networking switching method under a kind of isomery car networking environment.
Background technology
The integrated application of traditional cellular radio, WLAN and on-vehicle information technology promotes isomery car networking
Birth, the integrated of different characteristics cordless communication network, interoperability, fusion become the main trend that current vehicle networking is developed, branch
Hold the important feature that intelligentized vehicle-mounted end interaction, calculating and decision are isomery car networking application developments.It is with isomery car networking
The on-vehicle information business on basis is increasingly becoming the core of intelligent transportation system (Intelligent Traffic System, ITS)
Functional imperative.
Handover management (Handover Management) is the important theme of heterogeneous wireless network research field, in movement
In communication process, terminal from current network service region enter new network service area, by with original wireless network base station
Either on the link switching to new wireless network base station or new access point of access point connection, and continue in terminal
Network communication link.The automation of the seamlessness and handoff procedure of network switching requires handoff technique disclosure satisfy that have multi-mode
The mobile terminal of communication function is independently switched to most suitable access network from plurality of optional network.For on-vehicle information system
System, vehicle mobile terminals realization are made decisions on one's own, and the wireless network of access, and the dynamic between the different network ports are reasonably selected
The research hotspot of ubiquitous communication and ubiquitous computation under switching and isomery car networking environment.
Due to the dynamic characteristic of isomery car networking environment, radio network conditions change in real time with the time, it will are related to joining
Several dynamic changes, and the traditional network handover decisions optimization method Main Basiss parameter based on utility function and multiple attribute decision making (MADM)
Optimal value switch over, easily cause " table tennis " effect, frequent network switching not only accelerates vehicle mobile terminals hardware
The consumption of plant capacity eventually influences the benefit of whole network communication service.
Service quality (the Quality of of vehicular applications are faced towards the network switching under isomery car networking environment
Service, QoS) diversified demand, wireless network isomerism and dynamic, the concurrency of multiple terminals resource contention etc.
Challenge.Therefore, how vehicle mobile terminals are in the condition for meeting certain Internet resources constraint and the constraint of vehicular applications QoS demand
Under, autonomous, optimization is reliably that a variety of vehicular applications select rational target network, and the network item according to dynamic change
Part and vehicle-mounted mobile environment realize switching between isomery Radio Link, become multi-modal communications application under isomery car networking environment
Key problem.
Invention content
Using isomery car networking environment as background, the present invention proposes the heuristic vehicle of biology under a kind of isomery car networking environment
Carry method for switching network.The In-vehicle networking switching method is by the heuristic intelligent method of biology --- cytotaxis selects mould
Type is applied under dynamic heterogeneous network environment in vehicle-mounted mobile terminal network handover optimization decision problem, is meeting vehicular applications
The advantage of biocenose intelligence computation is taken full advantage of under the premise of QoS demand, not only maintains global network resource allocation
Fairness and the global benefit for having ensured limited Internet usage.
The present invention simulates microbial cell and adapts to gene expression behavior caused by dynamic nutrient environment, induces vehicle-mounted mobile
Terminal makes adaptive network switching decision, and dynamic vehicle mobile terminals are analogized to microbial cell, pass through microorganism
Cell makes a response rapidly for the adaptation mechanism of external dynamic nutrient environment, influences the gene expression inside microbial cell
With microbial cell liveness, and then the generation of cytotaxis son is influenced, it is final that vehicle mobile terminals is induced to make with highly
The network switching decision of adaptivity and robustness.Also, the present invention, further combined with multiple attributive decision making method, assessment is alternative
The performance indicator for accessing network, selects and the optimal network of vehicle-mounted user in the vehicle mobile terminals is suitble to access.
In-vehicle networking switching method under a kind of isomery car networking environment provided by the invention, is as follows：
Step 1: assessment utility function of the vehicle-mounted user for cordless communication network in construction vehicle mobile terminals；
A, for wireless network i, the channel quantity of wireless network i is denoted as Ci(t) a, the handling capacity of average each channel
For Ri, it is assumed that there are n by moment ti(t) a vehicular applications are connected to wireless network i, then are connected to the vehicle of the wireless network at this time
Carry the average throughput q that application can receivei(t) it is that the wireless network total throughout is distributed to the mean value of each vehicular applications.
For vehicle mobile terminals j, each vehicle mobile terminals are remembered there are multiple vehicle-mounted users, each vehicle-mounted user can be connected into wireless network
Single vehicular applications are executed after network.
B, the service quality that the present invention provides for the arbitrary heterogeneous wireless network i of quantitative evaluation for s type vehicular applications
QoS, it is proposed that satisfaction (i, s) function.
C, the personal preference of each vehicular applications type is weighted by vehicle-mounted user, proposes that utility function synthesis is weighed
The effectiveness QoS that the communication condition of wireless network is obtained is currently accessed for vehicle mobile terminals jj(t)。
Step 2: establishing the network switching decision model under the heuristic isomery car networking environment of biology；
A, in order to reflect service quality h that the vehicle-mounted user for being currently accessed isomery car networking totally obtains1, present invention use
The method of moving average is by period WjThe QoS of interior each vehicle-mounted userj(t) rolling average has been carried out after summing, has obtained h1。
Meanwhile in order to weigh the isomery car networking communication environment of real-time change around vehicle mobile terminals j, the present invention proposes
AvgQoSj(t) utility function.For vehicle mobile terminals j, it is known that be combined into the attachable alternative wireless networks collection of moment t
Netj(t), kjFor single alternative wireless network, i.e. kj∈Netj(t), to reflect vehicle mobile terminals j from alternative isomery without
The effectiveness that gauze network can be provided.
B, the sub- preference pattern of cytotaxis is applied to vehicle mobile terminals dynamic optimization decision problem, vehicle mobile terminals
Network switching is independently executed according to the resource constraint of the QoS demand of vehicular applications and global wireless network.
Step 3: with the optimal network accessed after multiple attributive decision making method selection switching；
A, QoS utility matrix is established.Since QoS is the important indicator for judging network performance, the present invention is whole by vehicle-mounted mobile
Element of the service quality QoS that the vehicular applications of end j are obtained from alternative wireless networks as QoS utility matrix.
B, the QoS utility matrix of standardization is calculated.Since the numerical value of QoS utility matrix elements is irregular, weight is added
QoS utility matrix is carried out standardization processing, constructs weight Standard Process by the factor.
C, positive ideal solution scheme and minus ideal result scheme are determined.For the vehicular applications on vehicle mobile terminals j, the present invention
It has evaluated the maximum value of performance indicator and minimum has been worth to positive ideal solution and minus ideal result.
D, each alternative wireless networks are calculated respectively at a distance from positive ideal solution and minus ideal result.
E, the degree of closeness of each alternative wireless networks and positive ideal solution is calculated.
F, each alternative wireless networks and the degree of closeness size of positive ideal solution are ranked up.By alternative heterogeneous wireless network
In closest to positive ideal solution alternative wireless networks select as access network.
Compared to more existing technology, the advantage of the invention is that：
(1) present invention has considered the handling capacity factor of heterogeneous network environment and different vehicles under car networking environment
The QoS demand condition of vehicular applications on mobile terminal is carried, the rapid vehicle-carrying communication environment for adapting to dynamic change comparatively fast reaches global
It is optimal, it effectively prevents " ping-pong " in tradition switching theory so that network switching is more intelligent, with height
Adaptivity and robustness.
(2) present invention uses the sub- preference pattern of cytotaxis, has dissected the regulation and control behavior of microbial cell idiotype network, base
Show an interesting new approach using cytotaxis as handover decisions solution in its adaptivity characteristic and its mathematical character.The present invention is fully sharp
With the advantage of biocenose intelligence computation, maintains the fairness of global network resource allocation and ensured limited network money
The global benefit that source uses.
Description of the drawings
Fig. 1 is isomery car networking environment lower network handoff scenario figure.
Fig. 2 is the In-vehicle networking switching method flow diagram under isomery car networking environment provided by the invention.
Fig. 3 is biological heuristic flow diagram.
Specific implementation mode
The method of the present invention is described in further detail below in conjunction with drawings and examples.
The present invention provides the In-vehicle networking switching method under a kind of isomery car networking environment, and flow as shown in Figure 2 is specific to wrap
Include following steps：
Step 1: assessment utility function of the vehicle-mounted user for cordless communication network in construction vehicle mobile terminals；
A, for wireless network i, the number of channel of the wireless network is denoted as Ci(t), the handling capacity of average each channel is Ri,
Assuming that there are n by moment ti(t) a vehicular applications are connected to the wireless network, then are connected to the vehicular applications of the wireless network at this time
The average throughput q that can receivei(t) it is to the mean value of each vehicular applications, i.e., the wireless network total throughout distributes：
B, the service quality QoS that the present invention provides for the arbitrary wireless network i of quantitative evaluation for the vehicular applications of s types,
Propose satisfaction (i, s) function：
For vehicle mobile terminals j, the wireless network i that currently connectsj, note runs vehicle-mounted in the vehicle mobile terminals
Using for pJ, s, then the collection of the vehicular applications composition of s types is combined into AS in the vehicle mobile terminalsJ, s.Meanwhile for s types
The maximum throughput demand boundary of vehicular applications, the type vehicular applications is qS, max, minimum handle up demand boundary be qS, min。
C, the personal preference of each vehicular applications type is weighted by vehicle-mounted user, the present invention proposes following effectiveness
Function Synthesis weighs the effectiveness obtained for the communication condition of vehicle mobile terminals j present access networks：
Wherein, ωJ, sIt is vehicle-mounted user on vehicle mobile terminals j for the personal preference weight of s type vehicular applications, i.e.,
ωJ, s＞ 0, and ∑s∈SωJ, s=1.S indicates that the type of vehicular applications is s types, and S indicates the collection of the type of all vehicular applications
It closes.
Step 2: establishing the network switching decision model under the heuristic isomery car networking environment of biology；
A, in order to reflect service quality h that the vehicle-mounted user for being currently accessed isomery car networking totally obtains1, present invention use
The method of moving average is by period WjThe QoS of interior each vehicle-mounted userj(t) rolling average has been carried out after summing, then QoSj(t)
Calculating formula is：
Meanwhile in order to weigh the isomery car networking communication environment of real-time change around vehicle mobile terminals j, the present invention proposes
AvgQoSj(t) utility function.For vehicle mobile terminals j, it is known that the vehicle mobile terminals are attachable alternative in moment t
Wireless network collection is combined into NetjAnd k (t),j∈Netj(t), to reflect that vehicle mobile terminals j can be carried from alternative wireless networks
The effectiveness of confession：
Wherein, γ ∈ (0,1].Since the process of network switching is required for that the Internet resources newly accessed are lost, what γ was indicated
It is discount factor when vehicle mobile terminals switch over.To put it more simply, the present invention is set as：
h2=AvgQoSj(t) (6)
B, the sub- preference pattern of cytotaxis is applied to vehicle mobile terminals dynamic optimization decision problem, vehicle by emphasis of the present invention
Load mobile terminal independently executes network and cuts according to the QoS demand of vehicular applications and the resource constraint of global wireless network
It changes.Microbial cell is simulated for gene expression behavior caused by dynamic nutrient environment adaptability, induces isomery car networking ring
Vehicle mobile terminals make adaptive network switching decision in border.
Flow as shown in Figure 3, the mechanism exhibition that researchers change according to the adaptive external environment condition of Bacillus coli cells
Analysis is opened, is modeled by coupled differential, random noise item is introduced, has obtained the mathematics of the sub- preference pattern of cytotaxis
Forms of characterization：
Wherein, A indicates cell mobilization degree, η1And η2It is independent from each other white Gaussian noise.S (A) and D (A) represent cell
Synthesis and decomposition rate caused by volume increases：
P and C represents the synthetic ratio and loss rate coefficient of cell mobilization degree, N1And N2The battalion of external survival environment offer is provided
Support levels of substance, N_thr1And N_thr2Two kinds of nutriments are represented for the threshold value of A increments, n1And n2Indicate cell for this
The sensitivity coefficient of two kinds of nutriments.
In the sub- preference pattern of cytotaxis, there are two attractors, i.e., there are two kinds during the gene regulation of cell
Stable state：m1>>m2Or m2>>m1.Meanwhile the reciprocation between cell and environment is by a pair of of variable (N1, N2) represent,
In order to adapt to the variation of environment, the selection of cell can be transformed into another attractor from an attractor, alternatively, in the change of environment
When change need not make a change, it can also keep current attractor.
In conjunction with formula (4) and (6), the present invention uses Sigmoid functions, is changed by the value of parameter a and b, by h1And h2
It is mapped in the section of [0,10], with the variable N for representing environmental change situationi(i=1,2) is associated：
To sum up, handover decisions mechanism proposed by the present invention is by the sub- abduction mechanism of cytotaxis：When cytotaxis selects shape
State is m1＞ ＞ m2When, vehicle mobile terminals suggestion carries out network switching, is connected in conjunction with multiple attributive decision making method and obtains effectiveness more
On high network；When cytotaxis selects state for m2＞ ＞ m1OrWhen, vehicle mobile terminals should keep working as
Preceding access network state, does not occur network switching.
Step 3: the optimal network accessed after selection switching in alternative wireless networks with multiple attributive decision making method；
A, QoS utility matrix is established.Since QoS is the important indicator for judging network performance, the present invention is whole by vehicle-mounted mobile
Element of the service quality QoS that each vehicular applications of end j are obtained from alternative wireless networks as QoS utility matrix：
X=[x (kj, pJ, s)] (11)
Wherein, if x (kj, pJ, s)=satisfaction (kj, s).
B, the QoS utility matrix of standardization is calculated.Since the numerical value of QoS utility matrix elements is irregular, by QoS effectiveness
Matrix X carries out standardization processing so that matrix element value is located in [0,1] section：
Weight factor ω is addedJ, s, construct weight Standard Process.For vehicle-mounted user each of on vehicle mobile terminals j
The difference of personal preference is weighted to obtain weight Standard Process：
y(kj, pJ, s)=ωJ, s×x′(kj, pJ, s) (13)
C, positive ideal solution and minus ideal result are determined.For the vehicular applications on vehicle mobile terminals j, positive ideal solution is obtained
And minus ideal resultIt is as follows：
D, each alternative wireless networks are calculated respectively at a distance from positive ideal solution and minus ideal result.For each alternative wireless
Network respectively with positive ideal solutionAnd minus ideal resultThe distance between can be calculated by following equations group：
E, the degree of closeness score of each alternative wireless networks and positive ideal solution is calculated.According to each alternative wireless networks
Respectively at a distance from positive ideal solution and minus ideal result, the degree of closeness score of each alternative wireless networks and positive ideal solution can be obtained：
F, each alternative wireless networks and the degree of closeness score size of positive ideal solution are ranked up.By alternative wireless network
The alternative wireless networks of degree of closeness highest scoring are selected as access network in network：
Claims (3)
1. the In-vehicle networking switching method under a kind of isomery car networking environment, it is characterised in that：It is as follows,
Step 1: assessment utility function of the vehicle-mounted user for cordless communication network in construction vehicle mobile terminals；
A, for wireless network i, the channel quantity of wireless network i is denoted as Ci(t) a, the handling capacity of average each channel is Ri,
Assuming that there are n by moment ti(t) a vehicular applications are connected to wireless network i, then are connected to the vehicle-mounted of the wireless network at this time and answer
With the average throughput q receivedi(t) it is that the wireless network total throughout is distributed to the mean value of each vehicular applications；For vehicle
Mobile terminal j is carried, remembers each vehicle mobile terminals there are multiple vehicle-mounted users, each vehicle-mounted user executes after being connected into wireless network
Single vehicular applications；
B, using satisfaction (i, s) function, the arbitrary heterogeneous wireless network i of quantitative evaluation provides for s type vehicular applications
Service quality QoS,
For vehicle mobile terminals j, the wireless network i that currently connectsj, remember the vehicular applications run in the vehicle mobile terminals
For pJ, s, then the collection of the vehicular applications composition of s types is combined into AS in the vehicle mobile terminalsJ, s, meanwhile, for the vehicle-mounted of s types
Using the maximum throughput demand boundary of the type vehicular applications is qS, max, minimum handle up demand boundary be qS, min；
C, by vehicle-mounted user for each vehicular applications type personal preference weight, propose utility function synthesis weigh for
Vehicle mobile terminals j is currently accessed the effectiveness QoS that the communication condition of wireless network is obtainedj(t)：
Wherein, ωJ, sIt is vehicle-mounted user on vehicle mobile terminals j for the personal preference weight of s type vehicular applications, i.e. ωJ, s
＞ 0, and ∑s∈SωJ, s=1；S indicates that the type of vehicular applications, S indicate the set of the type of all vehicular applications；
Step 2: establishing the network switching decision model under the heuristic isomery car networking environment of biology；
A, using the method for moving average by period WjThe QoS of interior each vehicle-mounted userj(t) rolling average is carried out after summing, is obtained
h1, then QoSj(t) calculating formula is：
For vehicle mobile terminals j, it is known that the vehicle mobile terminals are combined into Net in the attachable alternative wireless networks collection of moment tj
And k (t),j∈Netj(t), to reflect that the utility function that vehicle mobile terminals j can be provided from alternative wireless networks is as follows：
Wherein, γ ∈ (0,1], γ indicates discount factor of vehicle mobile terminals when switching over, to put it more simply, setting：
h2=AvgQoSj(t)
B, by the sub- preference pattern of cytotaxis be applied to vehicle mobile terminals dynamic optimization decision problem, vehicle mobile terminals according to
The resource constraint of the QoS demand of vehicular applications and global wireless network independently executes network switching；
Step 3: with the optimal network accessed after multiple attributive decision making method selection switching.
2. the In-vehicle networking switching method under a kind of isomery car networking environment according to claim 1, it is characterised in that：Institute
The mathematical character form for the sub- preference pattern of cytotaxis stated：
Wherein, A indicates cell mobilization degree, η1And η2It is independent from each other white Gaussian noise, S (A) and D (A) represent cell volume
Synthesis and decomposition rate caused by increasing：
P and C represents the synthetic ratio and loss rate coefficient of cell mobilization degree, N1And N2The nutrients of external survival environment offer is provided
Matter is horizontal, N_thr1And N_thr2Two kinds of nutriments are represented for the threshold value of A increments, n1And n2Indicate cell for both
The sensitivity coefficient of nutriment；
With Sigmoid functions, changed by the value of parameter a and b, by h1And h2It is mapped in the section of [0,10], with representative
The variable N of environmental change situationiIt is associated：
When cytotaxis selects state for m1＞ ＞ m2When, vehicle mobile terminals suggestion carries out network switching, determines in conjunction with more attributes
Plan method, which is connected to, to be obtained on the higher network of effectiveness；When cytotaxis selects state for m2＞ ＞ m1OrWhen,
Vehicle mobile terminals should keep present access network state, and network switching does not occur.
3. the In-vehicle networking switching method under a kind of isomery car networking environment according to claim 1, it is characterised in that：Step
Rapid three specifically,
A, QoS utility matrix is established；
B, the QoS utility matrix of standardization is calculated；
QoS utility matrix X is subjected to standardization processing so that matrix element value is located in [0,1] section：
Weight factor ω is addedJ, s, construct weight Standard Process；For vehicle-mounted individual subscriber each of on vehicle mobile terminals j
The difference of preference is weighted to obtain weight Standard Process：
y(Kj, pJ, s)=ωJ, s×x′(kj, pJ, s)
C, positive ideal solution and minus ideal result are determined：
D, each alternative wireless networks are calculated respectively at a distance from positive ideal solution and minus ideal result；
For each alternative wireless networks respectively with positive ideal solutionAnd minus ideal resultThe distance between pass through following equations group meter
It calculates：
E, the degree of closeness score of each alternative wireless networks and positive ideal solution is calculated：
F, each alternative wireless networks and the degree of closeness score size of positive ideal solution are ranked up, it will be in alternative wireless networks
The alternative wireless networks of degree of closeness highest scoring are selected as access network：
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| CN109799420A (en) * | 2019-02-13 | 2019-05-24 | 临沂大学 | A kind of the internet of things functional detection system and detection method of internet of things home appliance |
| CN111885543A (en) * | 2020-06-28 | 2020-11-03 | 北京交通大学 | Internet of vehicles switching method and device based on ultra-dense networking |
| CN111885543B (en) * | 2020-06-28 | 2021-08-27 | 北京交通大学 | Internet of vehicles switching method and device based on ultra-dense networking |
| CN112765892A (en) * | 2021-01-27 | 2021-05-07 | 东北大学 | Intelligent switching judgment method in heterogeneous Internet of vehicles |
| CN112765892B (en) * | 2021-01-27 | 2023-09-26 | 东北大学 | Intelligent switching judgment method in heterogeneous Internet of vehicles |
| CN112996071A (en) * | 2021-03-11 | 2021-06-18 | 北京交通大学 | Vehicle vertical switching method and system based on user service perception |
| CN112996071B (en) * | 2021-03-11 | 2021-12-31 | 北京交通大学 | Vehicle vertical switching method and system based on user service perception |
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