CN110650455A - Internet of vehicles access point switching method based on software defined network - Google Patents
Internet of vehicles access point switching method based on software defined network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
Abstract
The invention relates to a software defined network-based Internet of vehicles access point switching method, which comprises the following steps: the method comprises the steps that a global management and control function of a controller in a software-defined wireless network architecture is adopted to sense the positions of wireless access points and a mobile vehicle terminal, and a proper switching access point is found; and a plurality of network interfaces of the vehicle terminal are used for alternately taking charge of tasks of data sending and background scanning in the mobile switching process, so that the information interaction between the vehicles is uninterrupted. The software defined vehicle networking architecture separates a data plane and a control plane of traditional equipment, dynamically controls the vehicle networking behavior directly through programming, abstracts infrastructure of a bottom layer, provides an open interface for upper application, realizes unified management and upgrading, and meets the performance requirements of different vehicle users; background scanning and a plurality of network interfaces alternately execute tasks, switching time delay is greatly reduced, and the problems of high vehicle mobility and frequent access point switching are effectively solved.
Description
Technical Field
The invention belongs to the field of wireless network mobile management and service quality, and is applied to the Internet of vehicles.
Background
In many wireless network Access technologies, Internet of things (IOV) is a development direction of an intelligent transportation system, and the Internet of Vehicles has the characteristics of frequent topology change and high moving speed, and is expected to provide sufficient resources for Access at any time and any place, so as to obtain high-quality services, and therefore, telecommunication operators and service providers select large-scale deployment of Access Points (APs) to cover a larger-area. The current car networking architecture usually adopts a centralized networking mode of a thin AP and a wireless Controller (AC), wherein the thin AP only provides a device Access function, and the AC manages and controls the AP, but each device in the network mostly uses a product of a specific manufacturer, which is very disadvantageous to the development and upgrade of subsequent functions, and some devices even need to manually modify configuration one by one, and also have a compatibility problem in communication. Due to the fact that the vehicle terminal moves in a large range, the coverage area of the AP is limited, the AP cannot autonomously switch the vehicle terminal, the AC needs to be fully charged, once the number of the vehicle terminals is too large, performance bottleneck can occur in the AC, switching time delay can be increased, and flexibility is poor.
In the face of a large number of vehicle terminals, APs, and emerging endless network applications and services, Software Defined Networking (SDN) is proposed as an effective solution. The architecture is characterized in that a data forwarding plane and a control plane in network equipment are separated, a central controller is used for monitoring a bottom infrastructure, and different from an AC, the controller can provide a path decision for the forwarding equipment downwards through software programming and provide a calling interface for high-level application upwards, so that the overall network is obviously improved in the aspects of upgrading, function increasing and deleting, fine-grained control of flow and the like. SDN has been applied to various different types of wireless networks, and the main research points in car networking are load balancing of the network, routing protocols, and related issues in combination with other networks, and the research on switching of APs is less.
Compared with the prior art, the conventional vehicle intelligent terminal has larger capacity, higher running speed and better hardware configuration, and aims to bring faster service experience and better service quality to users. The traditional vehicle terminal uses a single network interface to connect the AP, and when the service quality is poor or the current AP is out of the coverage area, the AP switching is inevitably needed. According to the wireless access protocol, the existing AP must be disconnected, then available other APs must be scanned, and finally connection is attempted. By utilizing the background scanning technology, a plurality of network interfaces of the intelligent terminal and the flow table control function of the SDN, smooth switching among different APs can be realized, the transmission rate of the intelligent terminal can be increased, the packet loss rate of the intelligent terminal is reduced, and uninterrupted vehicle information interaction is ensured.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a software-defined network-based access point switching method for the Internet of vehicles, which solves the problem of smooth switching of vehicle users in the Internet of vehicles when the vehicle users move at different access points.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a software defined network-based Internet of vehicles access point switching method comprises the following steps: the method comprises the steps that a global management and control function of a controller in a software-defined wireless network architecture is adopted to sense the positions of wireless access points and a mobile vehicle terminal, and a proper switching access point is found; and a plurality of network interfaces of the vehicle terminal are used for alternately taking charge of tasks of data sending and background scanning in the mobile switching process, so that the information interaction between the vehicles is uninterrupted.
Preferably, the method specifically comprises:
s100, a vehicle terminal sends a detection request frame to surrounding wireless Access Points (APs), receives beacon frames sent by the surrounding APs and detection response frames returned by the surrounding APs to acquire AP information, and stores the AP information into an AP list AL of the vehicle terminal; the AP information comprises SSID, IP address, MAC address and link information; the link information comprises a signal-to-noise ratio, a channel number and a signal strength;
s200, the wireless access point AP acquires the position information of the vehicle terminal, reports the position information to the controller SC together with the position information of the wireless access point AP, and creates a terminal and AP information table; the information table comprises the position information of the terminal and the AP;
s300, the vehicle terminal selects a first AP with the maximum signal intensity and signal-to-noise ratio from the list AL, sends a connection request to the first AP by using a first network interface, and performs normal communication after the response is successful;
s400, the vehicle terminal starts to move, and when the channel quality is reduced to a given threshold value Q1Starting a switching process; the channel quality is obtained by signal strength and signal-to-noise ratio;
s500, SC updates the position information of the vehicle terminal, when the distance between the vehicle terminal and the first AP reaches a set threshold value DTH, the distances between the vehicle terminal and other APs are calculated and sequenced, a second AP with the shortest distance is selected, the second AP is informed to reply a detection response frame to the vehicle terminal, corresponding flow table information is modified, and data sent by the first AP is redirected to the second AP;
s600, the vehicle terminal utilizes a second network interface to normally communicate with a second AP, and when the difference between the quality of a connecting channel of the second network interface and the quality of a connecting channel of a first network interface reaches a threshold QTH, the first network interface is converted into a background scanning interface;
and S700, repeating the steps to complete the switching process of the plurality of wireless Access Points (AP).
Preferably, the handover procedure includes: aiming at the switching problem among different wireless access points in the Internet of vehicles, the network function and behavior are programmed and controlled in a software defined mode.
Preferably, the background scanning comprises: when the vehicle terminal enters the coverage range of a certain AP, establishing connection with the AP and normally communicating with the AP; when the link quality can not meet the requirement or the mobile station starts to move away from the AP which establishes connection with the link quality, searching a new AP for reconnection; when the AP with which the connection is established is disconnected, it normally communicates with a new AP.
Preferably, the method further comprises:
and in a time period when the vehicle terminal and the connected AP enter stable communication and stay, pre-scanning is carried out, and other AP information around is grasped in advance.
Preferably, the software-defined network-based vehicle networking architecture comprises an application layer, a control layer, an infrastructure layer and a vehicle terminal; the control layer is respectively connected with the application layer and the infrastructure layer; the infrastructure layer is connected with the control layer and the vehicle terminal layer respectively.
Preferably, the application layer executes deployment switching by using the relevant functions of the forwarding device and the controller by calling a northbound interface of the control layer.
Preferably, the control layer includes a controller SC for managing the underlying devices, and is responsible for acquiring various global useful data and making corresponding decisions according to the data.
Preferably, the infrastructure layer includes a wireless access point AP and a switch SW supporting an OpenFlow protocol; the wireless access point AP is used for monitoring the moving and access requests of the vehicle terminal, reporting effective information of the vehicle terminal and the wireless access point AP to the SC, receiving a flow table instruction issued by the SC and executing corresponding actions; the SW is used as a channel for transmitting data between different APs, connects the APs and the SC, and forwards network data and interacts with the SC.
Preferably, the vehicle terminal is a mobile device having a plurality of network interfaces, and the plurality of network interfaces represent a plurality of network cards, or represent that the vehicle terminal has a plurality of wireless modules, and can be connected to a plurality of different wireless access points AP after being turned on.
After the scheme is adopted, the invention has the beneficial effects that:
firstly, a novel software defined network architecture is introduced into the traditional Internet of vehicles, the advantages of numerical control separation, global control, open interfaces and the like of the architecture are utilized to sense the position of vehicle equipment and regulate and control the network forwarding behavior of the vehicle equipment, and the defects that the traditional architecture equipment is incompatible and the functions are not flexible enough are overcome; secondly, channel scanning and data forwarding are simultaneously carried out through a plurality of network interfaces of the vehicle terminal, and the time for searching for the switching AP is reduced, so that the switching time delay is reduced, and the service requirements of vehicle users are ensured.
The present invention is described in further detail with reference to the accompanying drawings and embodiments, but the method for switching the access point of the internet of vehicles based on the software defined network is not limited to the embodiments.
Drawings
FIG. 1 is a diagram of a software-based Internet of vehicles architecture in accordance with an embodiment of the present invention;
FIG. 2 is a diagram illustrating a mobile handoff of a vehicle terminal between two APs according to an embodiment of the present invention;
FIG. 3 is a network test topology in one embodiment of the invention;
fig. 4 is a handover delay result based on the conventional 802.11 protocol in an embodiment of the present invention;
fig. 5 is a result of handoff delay based on 802.11r protocol in an embodiment of the present invention;
FIG. 6 shows the result of the handover delay based on background scanning and multiple network interfaces according to an embodiment of the present invention;
fig. 7 is a switching delay result of the method for switching the access point of the software-defined internet of vehicles according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described and discussed in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention discloses a software-defined network-based Internet of vehicles access point switching method, which is characterized in that the global management and control function of an SDN controller is utilized to sense the positions of an AP and a mobile vehicle terminal, a proper switching access point is quickly found, and a plurality of network interface characteristics of the vehicle terminal are utilized to alternately take charge of tasks of data sending and background scanning in the switching process, so that the uninterrupted vehicle information interaction is realized.
The switching method is implemented by programming and controlling network functions and behaviors of different wireless access points in the Internet of vehicles in a software-defined mode aiming at the switching problem among the different wireless access points.
Referring to fig. 1, the software-defined vehicle networking architecture is composed of an application layer, a control layer, an infrastructure layer, and a vehicle terminal.
The application layer executes the deployment switching method by calling the northbound interface of the control layer and utilizing the related functions of the forwarding equipment and the controller.
The control layer and the core are controllers (SDN controllers, SCs), which manage underlying devices and are responsible for acquiring various global useful data and making corresponding decisions according to the data.
The infrastructure layer comprises an OF-AP and an OF-SW, which respectively represent a wireless access point and a switch (for convenience, hereinafter referred to as AP and SW) supporting an OpenFlow protocol, wherein the AP is responsible for monitoring the movement and access requests OF the vehicle terminal, reporting effective information OF the vehicle terminal and the AP to the SC, receiving a flow table instruction issued by the SC and executing corresponding actions; the SW is used as a channel for transmitting data between different APs, connects the APs and the SC, and forwards network data and interacts with the SC.
The vehicle terminal is mainly a mobile vehicle device with a plurality of network interfaces, wherein the plurality of network interfaces can represent a plurality of network cards, and can also represent that the terminal is provided with a plurality of wireless modules, and can be connected with a plurality of different APs after being started.
The invention expands the traditional switching process, and alternately completes the tasks of channel scanning and data forwarding by utilizing the background scanning technology and a plurality of network interfaces of the vehicle terminal, thereby realizing the uninterrupted vehicle operation service.
The background scanning technology comprises the steps that a vehicle terminal enters the coverage range of a certain AP; establishing connection and normal communication with the mobile terminal; the link quality can not meet the requirement or the original AP starts to move away; searching a suitable new AP for reconnection; and disconnecting the original AP and normally communicating with the new AP. Considering that the vehicle terminal does not necessarily move immediately after performing stable communication with the source AP and may stay for a period of time, the vehicle terminal may perform pre-scanning in the period of time to grasp information of other APs around in advance.
Referring to fig. 2, assume that the network of the vehicle terminal has two interfaces (wlan0 and wlan1), initially wlan0 is in the active state and wlan1 is in the off state. The circular areas represent coverage areas of different APs, and the rectangular areas represent channel quality changes with the APs during movement of the vehicle terminal. In an actual situation, the AP basically keeps the position fixed after the deployment is finished, and the SDN controller is used for collecting the position information of the vehicle terminal and the AP according to the principle that the strength of a signal is inversely proportional to the square of a coverage distance and guiding the vehicle terminal to quickly find a proper AP for switching.
In the process of moving the vehicle terminal, the moving position can be judged by calculating the distance between the vehicle terminal and the currently connected AP, the farther the distance is, the weaker the signal strength is, and if the distance exceeds a specified threshold range, an idle interface can be opened. The method comprises the steps that when a vehicle terminal scans an AP for connection for the first time, the condition of other surrounding APs is acquired, so that the AP can interact with an SC and select a proper switching AP to inform the vehicle terminal, the AP can utilize a standby interface to carry out connection request, after connection is successful, the SC sends a modified flow table item to carry out uninterrupted communication of data in a mode of redirecting to the AP, and when the vehicle terminal is completely away from an original AP, a vehicle terminal connection table maintained by the vehicle terminal is triggered to carry out addition and deletion of the table item.
Referring to fig. 2, a method for switching an access point of a car networking based on a software defined network includes:
and 3, initially, selecting an AP (access point) with the largest channel quality Rssi and the largest Snr parameter (taking AP1 as an example) from the list AL due to limited information collected by the vehicle terminal, sending a connection request to the AP by using a wlan0, and performing normal communication after successful response. If the vehicle terminal does not move for a period of time, turning on the wlan1 to perform pre-scanning in a background scanning manner, if an AP not in the list is found, adding the AP into the list as an AL, and performing pre-scanning only once considering that the scanning time is long and the vehicle terminal is static;
and step 5, in the moving process, the SC continuously updates the position information of the vehicle terminal, calculates the distances between the vehicle terminal and other APs and sorts the distances after the distance between the vehicle terminal and the AP1 reaches a set threshold DTH, selects the AP with the shortest distance (taking AP2 as an example here) to inform the AP to reply a probe response frame to the vehicle terminal, and establishes connection with the vehicle terminal. Redirecting data sent by the AP1 to the AP2 by modifying the corresponding flow table information;
and 6, at the time of P3, the vehicle terminal utilizes wlan1 to normally communicate with AP2, the channel quality is gradually enhanced, and when the difference between the connection quality of interfaces wlan1 and wlan0 reaches a predetermined threshold QTH at the time of P4, wlan0 is no longer suitable for undertaking data transceiving tasks, so that the interfaces are converted into interfaces for subsequent background scanning.
And 7, when the time P5 is reached, the vehicle terminal completely leaves the AP1, so that the wlan0 is disconnected with the AP, the processes are repeated, and when the two network interfaces need to perform AP switching, the tasks of background scanning and data receiving and sending are respectively executed, so that the situations of packet loss or communication interruption cannot occur in the whole process.
As can be seen from the above process operations, the times P1, P3, and P4 represent the AP handover initiation timing, the successful access to the new AP, and the network interface task switching timing, respectively, and also mean that the corresponding limited threshold conditions are reached at these time points. Many parameters are involved in this process, as described in detail below.
The AP list AL maintained by the terminal is identified by equation (1), where parameters such as SSID, MAC address, IP address, Rssi, Ch, and the like may be obtained from a beacon frame or a probe response frame sent by the AP.
AL＝{APi|(ID，SSID,IP,MAC,Snr,Rssi,Ch),i＝1,2,...,n} (1)
Since the relationship between the Snr and the actual link environment is tight, the calculation formula of the invention is shown in formula (2). P (t) is the transmission power at time t, d (t) is the distance between the receiver and the transmitter at time t, α is the path propagation loss factor, η is the noise level, and g (t) is the channel average gain at time t.
The channel quality mentioned in the present invention is mainly measured by two parameters of Rssi and Snr, as shown in formula (3), and considering that the latter reflects the channel quality better than the former and has a similar importance, α ═ 0.4 and β ═ 0.6 are taken here.
Q＝α*Rssi+β*Snr (3)
The value calculated when the terminal is in a stable state after establishing connection with the AP1 is set to QstableThe value can be regarded as the average value of the channel quality in the period from the successful connection to the switching start, the AP coverage radius is R, and Q is obtained in the steps (4), (5) and (6)1DTH and QTH are represented by the formulas (4) and (5), wherein A, B and C are weight coefficients, and A, B takes the value of [0,1]And C is [0,0.5 ]]The link state information can be modified according to the user requirements and the actual link conditions.
Q1＝Qstable*A,DTH＝R*B (4)
QTH＝Q4(wlan1)-Q4(wlan0)＝Q4(wlan1)*C (5)
Further, in this embodiment, under the network architecture shown in fig. 1, the Mininet-WiFi network tool is used to create the experimental platform shown in fig. 3, and an Oracle virtualbox5.1.18 is used to load an image of the simulation platform and load the Ubuntu 16.04.3 operating system. And downloading firmware of Mininet-WiFi and an Ryu controller from the GitHub to complete the establishment of a test environment, and setting Open vSwitch2.5.2 in the test environment to create a virtual OpenFlow switch.
When a test experiment is carried out, the invention utilizes the ping instruction in the system to evaluate whether the devices in the topological structure can be communicated with each other. The ping instruction is mainly judged according to whether the devices can receive the response message after transmitting the ICMP message mutually. And for the data messages generated by the equipment by utilizing various protocols, extracting and analyzing by using a wireshark packet capturing tool.
Referring to fig. 3, a method for switching an access point of a car networking based on a software-defined network (consistent with the method of fig. 2, the experimental platform includes 3 APs), includes:
step S100, the vehicle terminal sends a detection request frame to surrounding APs, acquires AP information according to a beacon frame sent by the AP and a returned detection response frame, mainly comprises SSID, IP address, MAC address and link information (signal-to-noise ratio, channel number and signal strength), and stores the information into an AP list AL of the vehicle terminal;
step S200, AP obtains the position information of vehicle terminal, reports the position information to SC together with the position information of itself, and creates terminal and AP information table;
step S300, the vehicle terminal selects the AP1 with the maximum signal intensity and signal-to-noise ratio from the list AL, uses wlan0 to send a connection request to the AP, and performs normal communication after response is successful;
step S400, the vehicle terminal starts to move, the channel quality is reduced to a given threshold value, and a switching process is started.
Step S500, SC updates the position information of the vehicle terminal, when the distance between the vehicle terminal and AP1 reaches the set threshold value, the distance between the vehicle terminal and other APs is calculated and sequenced, the AP with the shortest distance is selected, the AP is informed to reply a detection response frame to the vehicle terminal, the corresponding flow table information is modified, and the data sent by AP1 is redirected to AP 2;
step S600, the vehicle terminal utilizes wlan1 to normally communicate with AP2, the difference between the connection quality of wlan1 and wlan0 reaches a threshold value, and the vehicle terminal is converted into a background scanning interface;
and step S700, repeating the steps and finishing the switching process from the AP2 to the AP 3.
Fig. 4, 5, 6, and 7 are final handover delay result graphs, which compare four handover methods, that is, the conventional 802.11 protocol, the 802.11r protocol, the software-defined car networking access point handover method based on background scanning and multiple network interfaces, and based on location awareness and background scanning. The lower switching time delay and the smooth curve show that the method can realize uninterrupted service and good service experience of the vehicle user.
The above is only one preferred embodiment of the present invention. However, the present invention is not limited to the above embodiments, and any equivalent changes and modifications made according to the present invention, which do not bring out the functional effects beyond the scope of the present invention, belong to the protection scope of the present invention.
Claims (10)
1. A vehicle networking access point switching method based on a software defined network is characterized by comprising the following steps: the method comprises the steps that a global management and control function of a controller in a software-defined wireless network architecture is adopted to sense the positions of wireless access points and a mobile vehicle terminal, and a proper switching access point is found; and a plurality of network interfaces of the vehicle terminal are used for alternately taking charge of tasks of data sending and background scanning in the mobile switching process, so that the information interaction between the vehicles is uninterrupted.
2. The Internet of vehicles access point switching method based on the software defined network as claimed in claim 1, wherein the method specifically comprises:
s100, a vehicle terminal sends a detection request frame to surrounding wireless Access Points (APs), receives beacon frames sent by the surrounding APs and detection response frames returned by the surrounding APs to acquire AP information, and stores the AP information into an AP list AL of the vehicle terminal; the AP information comprises SSID, IP address, MAC address and link information; the link information comprises a signal-to-noise ratio, a channel number and a signal strength;
s200, the wireless access point AP acquires the position information of the vehicle terminal, reports the position information to the controller SC together with the position information of the wireless access point AP, and creates a terminal and AP information table; the information table comprises the position information of the terminal and the AP;
s300, the vehicle terminal selects a first AP with the maximum signal intensity and signal-to-noise ratio from the list AL, sends a connection request to the first AP by using a first network interface, and performs normal communication after the response is successful;
s400, the vehicle terminal starts to move, and when the channel quality is reduced to a given threshold value Q1Starting a switching process; the channel quality is obtained by signal strength and signal-to-noise ratio;
s500, SC updates the position information of the vehicle terminal, when the distance between the vehicle terminal and the first AP reaches a set threshold value DTH, the distances between the vehicle terminal and other APs are calculated and sequenced, a second AP with the shortest distance is selected, the second AP is informed to reply a detection response frame to the vehicle terminal, corresponding flow table information is modified, and data sent by the first AP is redirected to the second AP;
s600, the vehicle terminal utilizes a second network interface to normally communicate with a second AP, and when the difference between the quality of a connecting channel of the second network interface and the quality of a connecting channel of a first network interface reaches a threshold QTH, the first network interface is converted into a background scanning interface;
and S700, repeating the steps to complete the switching process of the plurality of wireless Access Points (AP).
3. The software-defined networking-based Internet of vehicles access point switching method according to claim 1, wherein the switching process comprises: aiming at the switching problem among different wireless access points in the Internet of vehicles, the network function and behavior are programmed and controlled in a software defined mode.
4. The software-defined networking-based Internet of vehicles access point switching method according to claim 1, wherein the background scan comprises: when the vehicle terminal enters the coverage range of a certain AP, establishing connection with the AP and normally communicating with the AP; when the link quality can not meet the requirement or the mobile station starts to move away from the AP which establishes connection with the link quality, searching a new AP for reconnection; when the AP with which the connection is established is disconnected, it normally communicates with a new AP.
5. The software-defined networking-based Internet of vehicles access point switching method according to claim 1, further comprising:
and in a time period when the vehicle terminal and the connected AP enter stable communication and stay, pre-scanning is carried out, and other AP information around is grasped in advance.
6. The software-defined network-based Internet of vehicles access point switching method according to claim 1, wherein the software-defined network-based Internet of vehicles architecture comprises an application layer, a control layer, an infrastructure layer and a vehicle terminal; the control layer is respectively connected with the application layer and the infrastructure layer; the infrastructure layer is connected with the control layer and the vehicle terminal layer respectively.
7. The software-defined networking-based Internet of vehicles access point switching method according to claim 6, wherein the application layer performs deployment switching by calling a northbound interface of the control layer and utilizing related functions of the forwarding device and the controller.
8. The Internet of vehicles access point switching method based on the software defined network as claimed in claim 6, wherein the control layer comprises a controller SC for managing the bottom layer device, and is responsible for acquiring various global useful data and making corresponding decisions according to the data.
9. The software-defined networking-based Internet of vehicles access point switching method according to claim 6, wherein the infrastructure layer comprises a wireless access point AP and a switch SW which support OpenFlow protocol; the wireless access point AP is used for monitoring the moving and access requests of the vehicle terminal, reporting effective information of the vehicle terminal and the wireless access point AP to the SC, receiving a flow table instruction issued by the SC and executing corresponding actions; the SW is used as a channel for transmitting data between different APs, connects the APs and the SC, and forwards network data and interacts with the SC.
10. The method as claimed in claim 6, wherein the vehicle terminal is a mobile device having multiple network interfaces, and the multiple network interfaces represent multiple network cards, or represent that the vehicle terminal has multiple wireless modules, and can connect to multiple different wireless Access Points (APs) after being turned on.
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| 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 |
| CN114245432A (en) * | 2021-12-13 | 2022-03-25 | 珠海格力电器股份有限公司 | Network connection method, device, system, electronic equipment and storage medium |
| WO2023098561A1 (en) * | 2021-12-01 | 2023-06-08 | 华为技术有限公司 | Communication method and apparatus |
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| CN114245432A (en) * | 2021-12-13 | 2022-03-25 | 珠海格力电器股份有限公司 | Network connection method, device, system, electronic equipment and storage medium |
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