CN108282354B

CN108282354B - Shared vehicle self-organizing network architecture method based on SDN

Info

Publication number: CN108282354B
Application number: CN201711101907.7A
Authority: CN
Inventors: 陈晨; 张国贤; 吕宁; 薛刚; 任智源
Original assignee: Xidian University
Current assignee: Xidian University
Priority date: 2017-11-10
Filing date: 2017-11-10
Publication date: 2021-03-23
Anticipated expiration: 2037-11-10
Also published as: CN108282354A

Abstract

The invention discloses a shared vehicle self-organizing network architecture method based on an SDN (software defined network), which mainly solves the problems that people have high internet access requirements, can not access the internet at any time and any place and shared single vehicles are difficult to manage at present. The method comprises the following implementation steps: deploying a Software Defined Network (SDN) controller and infrastructure according to the distribution condition of the shared bicycle in the area; setting corresponding function modules in the software defined network according to the function requirements of the shared bicycle; selecting each layer of function modules of the shared bicycle node according to the hierarchical structure of the transmission control protocol and the Internet protocol TCP/IP; and compiling related source codes of functional modules of each layer of the shared bicycle node into corresponding firmware through compiling software, burning the compiled firmware into shared bicycle hardware equipment, and then configuring network parameters for the shared bicycle. The invention expands the coverage range of the network by using the mode of sharing the bicycle ad hoc network, and is beneficial to the centralized management of the shared bicycle.

Description

Shared vehicle self-organizing network architecture method based on SDN

Technical Field

The invention belongs to the technical field of communication, and further relates to a shared vehicle self-organizing network architecture method which can be used for networking and managing shared vehicles.

Background

The advent of the shared bicycle age makes sharing a new life style and life attitude. However, the management difficulty is high, and the shared bicycle is favored by people due to convenience, cheapness and flexibility.

However, after it enters the avenue of a military city, a series of problems arise: sharing the bicycle to park and occupy the pedestrian path at will; the shared bicycle is stolen by a thief, maliciously damaged and the like, so a technology for performing centralized management on the shared bicycle is urgently needed.

Meanwhile, with the rapid development of the internet, people urgently need to access the network anytime and anywhere to improve the service experience of the internet. Although 4G networks are currently downloading quickly and becoming more popular, the high traffic cost has been an impediment to people not enjoying internet services quickly. There is therefore a need for a more convenient and efficient internet access service to meet the increasing traffic demand.

Disclosure of Invention

The invention aims to provide a shared vehicle self-organizing network architecture method based on an SDN (software defined network), which is used for managing shared vehicles in a centralized manner by using an Internet access service more conveniently and efficiently, expanding the coverage range of a wireless network, fully utilizing Internet resources and meeting the increasing network requirements of people.

Technical principle

1. Wireless mesh network

As a multi-hop network, a wireless mesh network has become a mainstream technology of the next generation network, and is becoming an important component of the next generation internet technology. The good topology control structure can ensure the network coverage quality and the communication quality, prolong the life cycle of the network, reduce the interference and conflict of the network in the communication process, improve the expansibility and the throughput rate of the wireless network, reduce the network energy consumption and the like.

Batman-adv communication protocol

In the invention, the wireless mesh network adopts a networking mode based on a batman-adv communication protocol. The batman-adv communication protocol is a relatively excellent wireless ad hoc network protocol in mesh networking, is designed into a kernel driver, introduces almost negligible data packet processing overhead, and better supports low-end equipment. In addition, most wireless routing protocols operate at the network layer. They send UDP packets, exchange routing information, and process routing tables of the cores to implement routing policies. While the operation of the batiman-adv communication protocol is completely in the data link layer, routing information is transmitted through ethernet frames, and the protocol also processes data traffic. The protocol encapsulates and forwards all data until the destination is reached, which simulates a virtual network switching environment. Thus, all nodes are as if they were locally linked, and are not affected by network changes, even if they do not know the topology of the network. The transmission path can be determined according to the existing resource condition of the network, so that better transmission performance is obtained, and the quality of the user is ensured to meet the QoS requirement. Thereby improving the performance of the network.

3. Software Defined Network (SDN) network architecture

As shown in fig. 1, a software defined network SDN is a novel network architecture, and is designed in a manner of separating a control plane and a data forwarding plane of a network, so that programmable control of underlying hardware is realized through a software platform in a centralized controller, and flexible network resource allocation as required is realized. The devices in the underlying network are centrally managed through a communication protocol openflow for interaction between the control layer and the data layer. In the SDN network, the network device is only responsible for pure data forwarding, and may adopt general hardware, while the operating system originally responsible for control is abstracted to an independent network operating system, and is responsible for adapting to different service characteristics, and the communication between the network operating system, the service characteristics, and the hardware device may be implemented through programming.

Second, the technical scheme

According to the principle, the implementation scheme of the invention is as follows:

(1) deploying a Software Defined Network (SDN) controller:

dividing a controller into a global controller and a local controller according to business logic level division, wherein the global controller has a global view and is used for managing the local controller, and the local controller controls shared single cars in an area;

(2) deploying infrastructure:

erecting a wireless base station near the center of an area with higher shared bicycle density, wherein the wireless base station is accessed to the Internet by using a wired optical fiber access mode, and the shared bicycle in the signal coverage range of the wireless base station is directly connected with the wireless base station; the shared bicycle outside the signal coverage range of the wireless base station is connected with the Internet in an ad hoc network mode;

(3) according to the function requirement of a shared bicycle, the following function modules are arranged in a Software Defined Network (SDN) controller:

the information management module: the system comprises a data flow statistical module, a data flow statistical module and a data flow statistical module, wherein the data flow statistical module is used for acquiring host information and data flow statistical information of a shared bicycle in an access network;

a visualization module: the system is used for displaying the information received by the software defined network controller in a visual interface mode, and comprises bottom layer equipment information display, link information display and network topology display;

a service application module: the system is used for deploying services and issuing strategies, scheduling and distributing network resources and carrying out centralized management on shared bicycles in a control network;

(4) selecting function modules of all layers of the shared bicycle node according to the hierarchical structure of a transmission control protocol and an internet protocol TCP/IP;

(5) configuring a shared bicycle network interface:

an Internet interface is arranged for connecting the sharing bicycle with the Internet;

setting a mesh wireless interface for wireless ad hoc network of ground equipment;

setting a user access interface for user access;

and setting a controller interface for connecting the software defined network controller.

Compared with the prior art, the invention has the following advantages:

1) compared with the traditional Internet of vehicles, the invention takes the shared bicycle as a wireless access node to access the network instead of a terminal, not only makes full use of the mobility of the vehicle and expands the coverage area of the network, but also facilitates the life of people and solves the problem that the shared vehicle is difficult to manage at present, thereby achieving two purposes at one stroke.

2) The invention uses the shared bicycle as the wireless node and does not use the automobile as the wireless node, so that the network topology is relatively more stable, and the realization difficulty is reduced.

3) The base stations used by the invention do not need to be arranged in a large area like the traditional mobile communication network base stations, only a plurality of base stations are configured in a specific area, and the arrangement cost is reduced.

Drawings

FIG. 1 is a network architecture diagram of a software defined network;

FIG. 2 is a flow chart of an implementation of the present invention;

figure 3 is a diagram of an SDN controller deployment in the present invention;

FIG. 4 is a facility deployment diagram of the present invention;

figure 5 is a functional block diagram of an SDN controller in the present invention;

FIG. 6 is a diagram of a shared bicycle node model in accordance with the present invention;

FIG. 7 is a diagram of a network interface for a shared bicycle in accordance with the present invention;

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

Referring to fig. 2, the implementation steps of the invention are as follows:

step 1, deploying a Software Defined Network (SDN) controller.

In a large-scale SDN environment, the problem of controller deployment needs to be considered, because the network scale which can be supported by a single controller is limited, the shared single vehicle is widely distributed across regions, and a centralized deployment strategy is difficult to meet the requirements of the large-scale cross-domain SDN environment. Therefore, the controller cluster is constructed by selecting a distributed technology, and the network performance, reliability and expandability can be improved by cooperatively managing and controlling the underlying network by a plurality of controllers according to areas;

a distributed SDN controller is essentially a computer cluster system consisting of a plurality of interconnected individual controllers, as shown in fig. 3. In fig. 3, the controller is divided into a global controller and a local controller, and the local controller is deployed in a centralized area of the shared bicycle and is responsible for running network functions that do not require a global network view, such as link discovery, switch learning function, local policy, and the like; the global controller is deployed in a management area, arranges and controls the local controller according to business requirements, coordinates the local controller to manage and control the bottom-layer shared bicycle, has a global network view, and is responsible for running global network functions such as routing calculation, flow engineering and the like.

And 2, deploying infrastructure.

As shown in fig. 4, after the software defined network SDN controller is deployed, the distribution of shared vehicles in an area needs to be investigated, the number of stations required in the area is estimated, an optimal deployment position is determined, and a suitable station height, antenna direction, downward inclination angle, signal coverage and the like are determined;

then deploying a wireless base station on the selected station site, wherein the wireless base station is accessed to the Internet by using a wired optical fiber access mode, and a sharing bicycle in the signal coverage range of the wireless base station is directly connected with the wireless base station; the shared bicycle outside the signal coverage range of the wireless base station is connected with the Internet in an ad hoc network mode.

And 3, setting a software defined network function module.

As shown in fig. 5, according to the requirement of the shared bicycle function, the following functional modules are arranged in the SDN controller:

the information management module is used for acquiring host information and data flow statistical information of a shared bicycle in an access network and storing the information in a database;

the visualization module is used for displaying the information maintained in the read information management module database to a user in the form of a webpage interface, and comprises a topology information submodule, an equipment information submodule and an equipment information submodule; the topology information submodule is used for displaying the position information and the network topology of the shared bicycle in the access network, namely reading the position information of the shared bicycle in the information management module database, periodically checking the database information by using an independent thread, and updating the topology display in real time if the position information of the shared bicycle in the database is checked to be changed; the device information submodule is used for displaying the information of the user devices connected with the shared bicycle and WIFI of the shared bicycle, namely reading the information of the shared bicycle devices in the information management module database and the information of the user devices connected with the WIFI of the shared bicycle, including basic information such as a network IP address, a physical MAC address, a transmission port number and the like, and displaying the basic information to a user in a form of a webpage interface; the service control submodule is used for displaying the application program in the service application module in an interface, namely calling the application program in the service application module through a web page interface for a user to call, and transmitting a user command into the service application module for processing;

the service application module is used for deploying services and issuing strategies, scheduling and allocating network resources and carrying out centralized management on shared single vehicles in a control network, and comprises a command reading sub-module, a data control sub-module and a data control sub-module;

the command reading submodule is used for acquiring the user command read in the visualization module and calling the related application in the application development submodule; the data control sub-module acquires relevant data in the information management module according to the application program requirement, sends the relevant data to the application program for processing, and transmits the result processed by the application program to a sharing bicycle in the network in a data flow mode; the application development submodule is used for a developer to develop an application program according to some specific functions and finally displaying the application program in the visualization module. The module processes data in the information management module database to realize centralized management of the shared bicycle. For example, a developer can calculate the time and the place where the user uses the shared bicycle most according to the real-time data of the shared bicycle in the information management module database, and the SDN controller determines the release area, the release amount and the release time of the shared bicycle according to the statistical information sent by the shared bicycle client; and the damaged shared bicycle automatically sends repair information to the SDN controller, and the SDN controller sends a worker for maintenance after receiving the repair information.

And 4, selecting each layer of function modules of the shared bicycle node according to the transmission control protocol and the hierarchy of the Internet protocol TCP/IP.

The TCP/IP hierarchy is a set of communication protocol hierarchies used to implement network interconnections and includes an application layer, a transport layer, a network layer, a data link layer, and a physical layer. As shown in fig. 6, wherein:

the invention mainly selects a dynamic host configuration module, adds a control module on the basis of the original module, and the control module is used for acquiring the information transmitted by the bottom module, packaging the information and transmitting the processed information to the lower module; the dynamic host configuration module automatically allocates IP addresses to the shared bicycle by operating a dynamic host configuration protocol DHCP;

the transport layer provides an end-to-end communication function for an application layer entity, ensures the sequential transmission of data packets and the integrity of data, and defines two main protocols: one is the transmission control protocol TCP, which is a reliable, connection-oriented byte stream-based data transmission protocol; the second is the user data protocol UDP, which is a connectionless data transmission protocol without guarantee of reliability. The invention adds openflow protocol on the basis of the original protocol, and the function of the protocol is to realize the connection between the controller and the switch by processing different types of messages. The transmission layer comprises a plurality of functional modules, the invention mainly selects a transmission adaptation module and a transmission protocol module, and adds a software defined network module on the basis of the original module, and the software defined network module runs an openflow protocol and is used for the communication between the shared bicycle and a software defined network controller; the transmission adaptation module is used for packaging the network layer data packet and adapting a corresponding transmission protocol according to the application layer data packet; the transmission protocol module operates a transmission control TCP protocol or a user datagram UDP protocol according to the transmission layer protocol determined by the transmission adaptation module;

the network layer mainly solves the problem of communication from the host to the host, and comprises an Internet Protocol (IP) and an Address Resolution Protocol (ARP). The IP protocol is a set of communication protocols for all computers in the network to communicate with each other, and addressing of the host is accomplished according to the destination IP address in the IP packet. The ARP protocol is a protocol that translates IP addresses into physical addresses. The network layer comprises a plurality of functional modules, the invention mainly selects an internet protocol module and an address analysis module, and the internet protocol module is used for operating the IP protocol of the network layer to complete the message transmission between the hosts in the network; the address resolution module is used for operating an address resolution protocol ARP and converting the IP address into a physical address;

and the data link layer provides services to the network layer on the basis of the services provided by the physical layer, and the most basic service is to reliably transmit data from the source host network layer to the target host network layer. The data link layer comprises a plurality of functional modules, the invention mainly selects a wireless local area network module, and adds an ad hoc network module on the basis of the original module. The wireless local area network module constructs a wireless local area network by operating a wireless local area network protocol; the ad hoc network module realizes the ad hoc network between the shared single vehicles by operating a networking protocol batiman _ adv;

the physical layer, which is at the lowest level of the TCP/IP hierarchy, functions to ensure that the original data can be transmitted over a variety of physical media. The physical layer comprises a plurality of functional modules, the invention mainly selects a wireless receiver module and a wireless transmitter module, and the wireless receiver module receives a data packet through a wireless medium; the wireless transmitter module transmits the data packet through a wireless medium.

And 5, configuring a shared bicycle network interface.

After the node model is designed, compiling the relevant source codes of the node model into corresponding firmware through compiling software, burning the compiled firmware into shared bicycle hardware equipment, and then configuring network parameters of the shared bicycle, so that the shared bicycle can realize self-networking and can be centrally controlled by an SDN controller, wherein a network interface diagram is shown in FIG. 7, and the implementation steps are as follows:

5.1) setting an Internet interface: firstly, virtualizing a virtual network interface eth0.1 on a physical network card through a virtualization technology, dividing a virtual local area network VLAN1 in the eth0.1, and mounting an Internet interface;

5.2) setting a mesh wireless interface: firstly, mounting a mesh wireless interface in a virtual network card eth0.1, bridging the mesh wireless interface and an Internet interface to a virtual local area network VLAN2, mounting a radio frequency signal radio1 on the mesh wireless interface for sharing the ad hoc network of a single workshop, wherein the protocol of the mesh wireless interface selects a batman-adv ad hoc network protocol;

5.3) setting a user access interface: firstly, virtualizing a virtual network interface eth0.2 on a physical network card through a virtualization technology, dividing a virtual local area network VLAN2 on the eth0.2, mounting a user access interface, mounting a radio frequency signal radio2 on the user access interface for user access, wherein the mode of the user access interface is selected to be a wireless access point AP mode, and service set identifiers SSID of the radio frequency signals radio2 are all set to be the same, so that a user can freely switch access points in the network;

5.4) setting a controller interface: firstly, a controller interface is hung in a virtual network card eth0.2, and the controller interface and a user access interface are bridged into a virtual local area network VLAN2 for connecting a software defined network controller;

the foregoing description is only an example of the present invention and should not be construed as limiting the invention, which is intended to be exemplary of the present invention, as it will be apparent to those skilled in the art that various changes and modifications in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A shared vehicle self-organizing network architecture method based on a Software Defined Network (SDN) is characterized by comprising the following steps:

(1) deploying a Software Defined Network (SDN) controller:

(2) deploying infrastructure:

(4) selecting each layer of function modules of the shared bicycle node according to the hierarchical structure of the transmission control protocol and the Internet protocol TCP/IP;

(5) configuring a shared bicycle network interface:

setting a user access interface for user access;

2. The method according to claim 1, wherein the selecting of the functional modules of each layer of the shared bicycle node in step (4) is performed by determining the following corresponding modules according to the transmission control protocol and the internet protocol TCP/IP hierarchy:

the application layer comprises: the control module and the dynamic host configuration module: the control module is used for managing the shared bicycle in a centralized way, and the dynamic host configuration module is used for automatically allocating an Internet Protocol (IP) address for the shared bicycle;

the transport layer includes: the system comprises a transmission protocol module, a software defined network module and a transmission adaptation module; the transmission protocol module is used for operating a transmission layer protocol transmission control protocol TCP or a user datagram protocol UDP, the software defined network module is used for connecting a software defined network controller, and the transmission adaptation module is used for encapsulating network layer data packets and adapting corresponding transmission layer protocols for each transmission layer port;

the network layer includes: an internet protocol module and an address resolution module; the IP module is used for completing message transmission between hosts in the network, and the address analysis module is used for converting IP addresses into physical addresses;

the data link layer includes: the wireless local area network module and the ad hoc network module; the wireless local area network module is used for constructing a wireless local area network, and the ad hoc network module is used for sharing an ad hoc network between the bicycles;

the physical layer includes: a wireless receiver module and a wireless transmitter module; the wireless receiver module is configured to receive a data packet via a wireless medium, the wireless transmitter module is configured to transmit the data packet via the wireless medium, and the wireless transmitter module is configured to transmit the data packet via the wireless medium.

3. The method according to claim 1, characterized in that the visualization module in step (3) comprises:

the topology information submodule is used for displaying the position information and the network topology of the shared bicycle in the access network;

the device information submodule is used for displaying the user device information accessed to the shared bicycle and the local area network, and comprises a network IP address, a physical MAC address and a transmission port number;

and the business control submodule is used for displaying the application program in the service application module in an interface for the user to call and transmitting the user command into the service application module for processing.

4. The method according to claim 1, characterized in that the service application module in step (3) comprises:

the command reading sub-module is used for acquiring the user command read by the visualization module and calling the related application in the application development sub-module;

the data control submodule acquires relevant data in the information management module according to the application program requirement, sends the relevant data to the application program for processing, and transmits the result processed by the application program to a shared bicycle in a network in a data flow mode;

and the application development submodule is used for developing the application program according to some specific functions by a developer and finally displaying the application program in the visualization module.

5. The method of claim 1, wherein the step (5) of setting the Internet interface comprises virtualizing a virtual network interface eth0.1 on the physical network card by virtualization technology, dividing the virtual local area network VLAN1 in eth0.1, and mounting the Internet interface.

6. The method according to claim 5, characterized in that the step (5) of setting the mesh wireless interface is to mount the mesh wireless interface in a virtual network interface eth0.1, bridge the mesh wireless interface and the Internet interface to a virtual local area network VLAN2, and mount a radio frequency signal radio1 on the mesh wireless interface for sharing the ad hoc network of the single workshop, wherein the mesh wireless interface protocol is selected from a batman-adv ad hoc network protocol.

7. The method of claim 1, wherein the step (5) of setting the user access interface comprises virtualizing a virtual network interface eth0.2 on the physical network card by virtualization technology, dividing a virtual local area network VLAN2 on eth0.2, and mounting the user access interface, and mounting the radio frequency signal radio2 on the user access interface for user access, wherein the mode of the user access interface is selected to be the wireless access point AP mode.

8. The method according to claim 7, characterized in that the controller interface is set in step (5) by mounting the controller interface in the virtual network interface eth0.2 and bridging the controller interface and the user access interface into the virtual local area network VLAN2 for connecting the software defined network controller.