Wireless network system for laneway scenario

Abstract

The application discloses a kind of wireless network systems for tunnel class scene, without central controller and switch, can save cost.Wireless access point is deployed in each station for tunnel class application scene, when intelligent mobile device moves to the coverage of wireless access point, real-time communication with the application server of the station where wireless access point is located can be realized, data transmission efficiency can be greatly improved, and network communication real-time performance is improved.Two wireless radio frequency modules in wireless node are used to communicate with different wireless access points in different frequency bands, so that different wireless access points can receive the same data simultaneously, two channels can work in parallel in wireless network system, spatial diversity multiplexing wireless channel resources, wireless node uses two channels for data transmission, which can ensure seamless roaming communication and maximize the use of two-channel wireless communication resources, improve the overall throughput of network.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and in particular to a wireless network system for a laneway scenario. BACKGROUND

[0002] At present, most production systems mainly use multiple people to lift and carry, and the production efficiency is extremely low. Therefore, it is urgent to use automatic guided vehicles (AGV) and other automated and intelligent mobile devices to replace more than 90% of manual distribution, transfer, lifting and other production logistics processes, thereby greatly improving production efficiency. AGV or other intelligent mobile devices must communicate wirelessly, so an excellent wireless communication solution is the basis for realizing efficient operation of AGV.

[0003] At present, more intelligent mobile devices such as AGV are applied to laneway scenarios. The wireless networks currently applied to laneway scenarios include WIFI networks and WIA-FA networks, and the architectures of the two networks are similar. In the scenario of long-distance roaming communication, WIFI networks need to increase AC access controllers to realize seamless roaming communication, and the roaming communication switching delay of industrial WIFI is about 20-100 ms. Therefore, it can be concluded that both WIFI networks and WIA-FA networks are enhanced star architectures, that is, one center (AC controller of WIFI or gateway device of WIA-FA), multiple distributed wireless access points (AP of WIFI or access device of WIA-FA), and multiple wireless nodes (STA of WIFI or field device of WIA-FA). The center and the access point are connected through a wired network, that is, in the laneway application scenario, a large number of network cables need to be laid to connect all the access points, so as to cover all mobile communication areas.

[0004] However, most long-distance laneway scenarios cannot be connected by ordinary network cables, because the communication limit of network cables is 100 meters. If the distance exceeds 100 meters, optical fibers or additional switches need to be used, which greatly increases the cost, and if one of the intermediate lines or devices is damaged, the entire network cannot operate normally, causing production accidents. Moreover, the cost of long-distance wired cables is relatively high, and the cables in the laneway scenario (such as factory workshops or underground mines) are easily damaged, and the maintenance cost is relatively high. In addition, in some one-stop assembly workshops in the aircraft and train manufacturing industry, the original cables have been laid, and the addition of new intelligent mobile devices such as AGV requires the re-laying of cables, which results in the need to re-decorate the pipelines in the underground or wall, wasting a large amount of manpower and financial cost. Since both WIFI and WIA-FA solutions require a center (AC controller or gateway device), this not only increases the system cost, but also causes the entire wireless network system to be unable to operate when the center fails, resulting in serious losses.

[0005] The information disclosed in this Background section is only for the purpose of increasing an understanding of the general context of the present application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known in any country in the world. SUMMARY

[0006] The present application aims to provide a wireless network system for a tunnel-like scene, which can save cost, greatly improve data transmission efficiency, and improve network communication real-time performance. Moreover, seamless roaming communication is realized, and the working efficiency of intelligent mobile devices in a tunnel-like scene is ensured. In addition, two channels in the wireless network system can work in parallel, spatially multiplexing wireless channel resources, and wireless nodes can simultaneously utilize two channels for data transmission, which can ensure seamless roaming communication and maximize the use of wireless communication resources of two channels, thereby improving the overall throughput of the network.

[0007] To achieve the above-mentioned purpose, the present application provides a wireless network system for a tunnel-like scene, comprising: a wireless access point configured for each station on a target path and a wireless node integrated in an intelligent mobile device with a travel route being the target path.

[0008] The wireless node comprises two wireless radio frequency modules, and the two wireless radio frequency modules have different working frequency bands; the two wireless radio frequency modules are used for wireless communication with different wireless access points.

[0009] The wireless node is used for receiving first type data sent by a controller of the intelligent mobile device, copying the first type data into two copies, and sending the two copies of the first type data to different wireless access points through the two wireless radio frequency modules, respectively.

[0010] In an embodiment of the present application, the wireless access points configured for two adjacent stations on the target path use different channels for data transmission, and when the intelligent mobile device is in the overlapping coverage area of the wireless access points corresponding to the two adjacent stations, the two wireless radio frequency modules simultaneously perform wireless communication with the wireless access points corresponding to the two adjacent stations.

[0011] In an embodiment of the present application, the distance between any two stations on the target path is greater than or equal to a distance threshold, and the wireless access points configured for the stations on the target path alternately use a first channel and a second channel for wireless communication.

[0012] In an embodiment of the present application, the wireless access points on the target path using the same channel for wireless communication include a first access point and a second access point, and the distance between the first station corresponding to the first access point and the second station corresponding to the second access point is less than a distance threshold, and the wireless access points at each station on the target path are connected to the two wireless radio frequency modules using time division multiple access communication technology.

[0013] In an embodiment of the present application, the intelligent mobile device includes an automated guided vehicle.

[0014] In an embodiment of the present application, the wireless access points at different stations on the target path are not connected by wire.

[0015] In an embodiment of the present application, the wireless node further includes an Ethernet interface and a processor, the Ethernet interface is connected to the processor, and the processor is connected to the two wireless radio frequency modules.

[0016] The Ethernet interface is configured to be connected to the controller and receive the first type of data, and the processor is configured to duplicate the first type of data into two copies and send the two copies of the first type of data to the two wireless radio frequency modules, respectively.

[0017] In an embodiment of the present application, the two wireless radio frequency modules are further configured to receive second type of data sent by different wireless access points, and the processor is further configured to send the second type of data to the controller through the Ethernet interface.

[0018] Compared with the prior art, the wireless network system for a tunnel type scenario according to the present application does not have a central controller and a switch, which can save costs. The tunnel type application scenario deploys a wireless access point at each station, and when the intelligent mobile device moves into the coverage range of the wireless access point, real-time communication with the application server of the station where the wireless access point is located can be achieved, which can greatly improve the data transmission efficiency and improve the real-time performance of network communication. Moreover, the communication between the wireless node and each wireless access point does not have switching actions, but is synchronous real-time communication, thereby realizing seamless roaming communication and ensuring the work efficiency of the intelligent mobile device in the tunnel type scenario. In addition, through the two wireless radio frequency modules in the wireless node, different wireless access points can receive the same data simultaneously by using different working frequency bands and different wireless access points for wireless communication, so that two channels can work in parallel in the wireless network system, the wireless channel resources are spatially diversity multiplexed, and the wireless node simultaneously utilizes two channels for data transmission, which can ensure seamless roaming communication and maximize the utilization of wireless communication resources of the two channels, thereby improving the overall throughput of the network. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is one of structure schematic diagrams of a wireless network system for a laneway type scene according to an embodiment of the present application;

[0020] Figure 2 is one of structure schematic diagrams of a wireless node in a wireless network system for a laneway type scene according to an embodiment of the present application;

[0021] Figure 3 is one of structure schematic diagrams of a wireless network system for a laneway type scene according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of protection of the present application is not limited by the specific embodiments.

[0023] Unless otherwise explicitly stated, throughout the specification and claims, the term "comprise" or variations such as "comprises" or "comprising" will be understood to imply the inclusion of a stated element or group of elements but not the exclusion of any other element or group of elements.

[0024] Network technology is an important supporting technology for factory intelligentization, and is a prerequisite for realizing interconnection and intercommunication between devices and systems. Access technology is the basic part of network technology. Due to the advantages of low cost, easy maintenance, flexibility, and easy implementation of wireless access technology, it is the main trend of current access technology development. First, wireless network can support ubiquitous sensing of intelligent factory, support factory whole process, whole life cycle management and control; second, wireless network with its flexible and convenient characteristics becomes an inevitable choice to realize flexible reorganization of factory, and has important significance to promote manufacturing industry from traditional mass production mode to industrial 4.0 era of personalized production mode; in addition, wireless network solves the problems of high wiring and maintenance cost, poor mobility and flexibility faced by wired network in factory, and will play an important role in improving production efficiency, improving product quality, and reducing production cost.

[0025] At present, wireless networks have been applied to production systems. In the production system, AGV or other intelligent mobile devices must communicate through wireless. In addition to the common factory production workshop using AGV, more and more intelligent mobile devices such as AGV are currently applied to tunnel type application scenarios. Such scenarios include the following types: 1) wireless communication between underground mine automatic transfer vehicles and special systems in each tunnel; 2) wireless communication between underground rail vehicles and special equipment in each section; 3) one-stop assembly workshop in the aircraft and train manufacturing industry. The one-stop assembly workshop is usually tens of meters wide and hundreds of meters long, which is a one-stop product production workshop from component production, assembly production, final assembly production to integrated testing. From the arrival of components in the factory to the completion of the aircraft test flight, it needs to go through component processing, assembly production, final assembly production, etc. Each production process is a production unit composed of various devices or systems. The processing and testing of each link are carried out. The one-stop assembly workshop is a long rectangle with tens of meters wide and hundreds of meters long. Each production unit occupies a part of the area, and the production units form a straight line. The logistics operation between the production units can adopt the transmission mode of AGV, that is, the AGV reciprocates in a straight line in the workshop and communicates with the devices between the production units, which is similar to the wireless communication scenario in the tunnel.

[0026] At present, the mainstream wireless communication solution in the industry includes WIFI, WIA-FA, 4G / 5G high-speed wireless network solution, or Zigbee, WirelessHart, WIA-PA sensor network type wireless network solution. The above AGV communication scenario may have audio and video or file transmission, which usually requires a certain network bandwidth. Zigbee, WirelessHart, WIA-PA sensor network technology cannot meet the bandwidth requirements and is not suitable for application in this scenario. The 4G / 5G communication network requires the erection of a base station, and the terminal requires a SIM card, which is high in cost and is not suitable for application in this scenario. WIFI technology and WIA-FA technology are more suitable for such communication scenarios due to their high bandwidth, low latency, and low cost.

[0027] According to the above, the wireless network currently applied to the tunnel type scenario includes WIFI network and WIA-FA network, and the architectures of the two networks are similar. However, the architectures of the two networks inevitably have technical problems. Therefore, the embodiment of the present application provides a wireless network system for a tunnel type scenario.

[0028] The embodiment of the present application provides a wireless network system for a tunnel type scenario, which includes a wireless access point configured for each station on a target path and a wireless node integrated in an intelligent mobile device with a target path as a travel route.

[0029] The wireless node includes two wireless radio frequency modules with different working frequency bands, and the two wireless radio frequency modules are used for wireless communication with different wireless access points.

[0030] The wireless node is used for receiving first type data sent by a controller of the intelligent mobile device, copying the first type data into two copies, and sending the two copies of the first type data to different wireless access points through the two wireless radio frequency modules respectively.

[0031] Specifically, the wireless network system for the tunnel scene provided in the embodiment of the present application is used for the tunnel scene in which the running route of the intelligent mobile device is fixed and basically long-distance round-trip operation. The intelligent mobile device has no central dispatching system, and after moving to one of the workstations, the intelligent mobile device performs information interaction with the wireless access point configured for the workstation, and then moves to the next workstation, and so on.

[0032] Figure 1 Fig. 1 is a structural schematic diagram of the wireless network system for the tunnel scene provided in the embodiment of the present application. As shown in Fig. 1, the tunnel scene can include multiple workstations, Figure 1 Figure 1 only two workstations, i.e., workstation 11 and workstation 12, are taken as examples for illustration. The tunnel scene has a target path, and each workstation is arranged on the target path at a certain distance. Each workstation is configured with a plurality of application servers, and the number of the application servers configured on each workstation can be set according to needs, which is not specifically limited here.

[0033] The wireless network system includes wireless access points configured for each workstation, such as wireless access point 111 configured for workstation 11 and wireless access point 112 configured for workstation 12. All the application servers on each workstation are in communication connection with the intelligent mobile device through the wireless access point configured for the workstation. The wireless network system further includes a wireless node 131 integrated in an intelligent mobile device 13. The running path of the intelligent mobile device is the target path, i.e., the intelligent mobile device moves in the tunnel scene. It can be understood that the intelligent mobile device can be an automatic guided vehicle (AGV) in the embodiment of the present application.

[0034] The wireless node 131 integrated in the intelligent mobile device 13 includes two wireless radio frequency modules, i.e., a first wireless radio frequency module 1311 and a second wireless radio frequency module 1312, and the two wireless radio frequency modules have different working frequency bands. The two wireless radio frequency modules are used for wireless communication with the wireless access points configured for different workstations in the tunnel scene.

[0035] ​The wireless node 131 can receive the first type of data from the controller of the intelligent mobile device, the first type of data can include service data and a target IP address corresponding to the service data. The wireless node 131 can also duplicate the first type of data into two copies and send the two copies of the first type of data to different wireless access points through the first wireless radio frequency module 1311 and the second wireless radio frequency module 1312 respectively.

[0036] After that, the wireless access point receives the first type of data, analyzes the first type of data, judges whether there is a target application server with the same IP address as the target IP address in the first type of data in each application server on the corresponding work station of the wireless access point, and if there is, the first type of data or the service data in the first type of data is sent to the target application server.

[0037] The wireless network system for the tunnel type application scenario provided in the embodiment of the present application does not have a central controller and a switch, which can save costs. The tunnel type application scenario is deployed with a wireless access point at each work station, and when the intelligent mobile device moves into the coverage range of the wireless access point, real-time communication with the application server of the work station where the wireless access point is located can be realized, which can greatly improve the data transmission efficiency and improve the real-time performance of network communication. Moreover, the communication between the wireless node and each wireless access point has no switching action, but is synchronous real-time communication, thereby realizing seamless roaming communication and ensuring the work efficiency of the intelligent mobile device in the tunnel type scenario. In addition, through the two wireless radio frequency modules in the wireless node, different working frequency bands and different wireless access points are used for wireless communication, so that different wireless access points can receive the same data at the same time, two channels can work in parallel in the wireless network system, the wireless channel resources are spatially diversity multiplexed, and the wireless node simultaneously uses two channels for data transmission, which can not only ensure seamless roaming communication but also maximize the use of wireless communication resources of the two channels and improve the overall throughput of the network.

[0038] On the basis of the above embodiment, the wireless network system for the tunnel type application scenario provided in the embodiment of the present application has no wired connection between the wireless access points configured by the application servers of different work stations on the target path.

[0039] Specifically, in the embodiment of the present application, the wireless access points configured by the application servers of different work stations on the target path have no wired connection and can be independent of each other, which can greatly reduce wiring work, reconstruction of underground pipelines and other infrastructure reconstruction work, thereby greatly reducing costs. At the same time, since the wiring work is reduced, the wireless network system for the tunnel type application scenario provided in the embodiment of the present application has the advantage of rapid deployment of applications.

[0040] On the basis of the above-mentioned embodiments, the wireless network system for the tunnel type scene provided in the embodiments of the present application, the wireless node further comprises an Ethernet interface and a processor, the Ethernet interface is connected with the processor, and the processor is connected with the two wireless radio frequency modules;

[0041] The Ethernet interface is used for being in communication connection with the controller and receiving the first type of data, and the processor is used for copying the first type of data into two copies and sending the two copies of the first type of data to the two wireless radio frequency modules respectively.

[0042] Specifically, as shown in Figure 2 the structure diagram of the wireless node integrated in the intelligent mobile device in the wireless network system for the tunnel type scene provided in the embodiments of the present application, the wireless node 131 comprises the first wireless radio frequency module 1311 and the second wireless radio frequency module 1312, and further comprises an Ethernet interface 1314 and a processor 1313, the Ethernet interface 1314 is connected with the processor 1313, and the processor 1313 is connected with the first wireless radio frequency module 1311 and the second wireless radio frequency module 1312 respectively.

[0043] The Ethernet interface 1314 can be in communication connection with the controller of the intelligent mobile device and receive the first type of data from the controller of the intelligent mobile device. The processor can copy the first type of data into two copies and send the two copies of the first type of data to the two wireless radio frequency modules respectively. Thereafter, the two wireless radio frequency modules can send the two copies of the first type of data to different wireless access points through the two wireless radio frequency modules respectively.

[0044] In the embodiments of the present application, the wireless node realizes the communication connection with the controller of the intelligent mobile device through the Ethernet interface, which can ensure the smooth reception and forwarding of the first type of data.

[0045] On the basis of the above-mentioned embodiments, the wireless network system for the tunnel type scene provided in the embodiments of the present application, the wireless access points arranged at two adjacent workstations on the target path use different channels for data transmission, when the intelligent mobile device is in the overlapping coverage area of the wireless access points corresponding to the two adjacent workstations, the two wireless radio frequency modules simultaneously perform wireless communication with the wireless access points corresponding to the two adjacent workstations.

[0046] Specifically, in the embodiments of the present application, since the two wireless radio frequency modules in the wireless node are used for performing wireless communication with different wireless access points, two channels can be used for data transmission in the wireless network system. Further, the wireless access points arranged at two adjacent workstations on the target path can use different channels for data transmission, so that the collision of wireless data can be prevented.

[0047] Based on this, when the smart mobile device is in the overlapping coverage area of ​​the wireless access points corresponding to two adjacent workstations, the two wireless radio frequency modules in the built-in wireless node of the smart mobile device will simultaneously communicate wirelessly with the wireless access points corresponding to these two adjacent workstations. In this way, there is no roaming handover problem, and seamless roaming is achieved.

[0048] Based on the above embodiments, the wireless network system for alleyway scenarios provided in this embodiment of the invention has a distance between any two workstations on the target path that is greater than or equal to a distance threshold, and the wireless access points configured at each workstation on the target path alternately use the first channel and the second channel for wireless communication.

[0049] Specifically, in this embodiment of the invention, if the distance between any two workstations on the target path is greater than or equal to a distance threshold, the wireless access points configured at each workstation on the target path alternately use the first channel and the second channel for wireless communication. This distance threshold can be set as needed and is not specifically limited here; it can be the distance between two workstations when their wireless access points simultaneously transmit data without data collision.

[0050] Alternating use means that wireless access points configured in adjacent workstations use different first and second channels for wireless communication, while wireless access points configured in non-adjacent workstations use the same channel, that is, both use the first or second channel for wireless communication.

[0051] Figure 3 This is a second schematic diagram of a wireless network system for alleyway scenarios provided in an embodiment of the present invention. Figure 3 As shown, the target path includes four workstations: workstations 31, 32, 33, and 34. Each workstation is equipped with a wireless access point: wireless access point 311, wireless access point 321, wireless access point 331, and wireless access point 341. The distance between any two workstations is greater than or equal to a distance threshold. Therefore, wireless access points 311 and 331 communicate wirelessly using the first channel, while wireless access points 321 and 341 communicate wirelessly using the second channel. The intelligent mobile device 35 moves along the target path.

[0052] Because of the limited wireless communication distance, even if the wireless access point 311 configured at workstation 31 and the wireless access point 331 configured at workstation 33 send data at the same time, the spatial distance will not cause wireless data collision and packet loss, thus enabling spatial diversity of the wireless network system.

[0053] On the basis of the above-mentioned embodiments, the wireless network system for the laneway type scene provided in the embodiments of the present application, the wireless access points using the same channel for wireless communication on the target path include the first access point and the second access point, and the distance between the first station corresponding to the first access point and the second station corresponding to the second access point is less than the distance threshold, and the wireless access points configured at each station on the target path and the two wireless radio frequency modules are connected in communication by using the time division multiple access communication technology.

[0054] Specifically, in the embodiments of the present application, if the wireless access points using the same channel for wireless communication on the target path include the first access point and the second access point, taking the first access point as the wireless access point 311 and the second access point as the wireless access point 331 as an example, the first station is the station 31 and the second station is the station 33, when the distance between the station 31 and the station 33 is less than the distance threshold, it means that the wireless access point 311 and the wireless access point 331 cannot simultaneously perform data transmission with the two wireless radio frequency modules, because data collision is likely to occur. Therefore, the time division multiple access (TDMA) communication technology is introduced, and the communication parties in the entire wireless network system are connected in communication by using the time division multiple access communication technology. That is, the wireless access points configured at each station on the target path and the two wireless radio frequency modules are connected in communication by using the time division multiple access communication technology. In this way, the wireless access points configured at different stations and the two wireless radio frequency modules can be staggered in time domain, so as to solve the problem of wireless data collision.

[0055] On the basis of the above-mentioned embodiments, the wireless network system for the laneway type scene provided in the embodiments of the present application, the two wireless radio frequency modules are further used for receiving second type data sent by different wireless access points; and the processor is further used for sending the second type data to the controller through the Ethernet interface.

[0056] Specifically, in the embodiments of the present application, the two wireless radio frequency modules not only have the function of sending two copies of the same first type data, but also have the function of receiving second type data sent by two different wireless access points, and then the second type data can be sent to the controller of the intelligent mobile device through the Ethernet interface by the processor, so that the controller of the intelligent mobile device can receive the second type data in time.

[0057] It can be understood that the second type data also contains service data and the IP address of the application server sending the service data.

[0058] The apparatus embodiments described above are only exemplary, in which the units as shown can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place or can be distributed on a plurality of network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those skilled in the art can understand and implement without creative labor.

[0059] Those skilled in the art will appreciate that embodiments of the application can be provided as methods, systems, or computer program products. Accordingly, the application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects.

[0060] The foregoing description of specific exemplary embodiments of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. It is intended that the scope of the application be limited not with this detailed description, but rather by the claims appended hereto.

Claims

1. A wireless network system for a tunnel-like scenario, characterized by The application relates to a wireless node integrated in a smart mobile device with a travel route as a target path. The wireless node comprises two wireless radio frequency modules with different working frequency bands, and the two wireless radio frequency modules are used for wireless communication with different wireless access points. The wireless node is used for receiving first type data sent by a controller of the smart mobile device, copying the first type data into two copies, and sending the two copies of the first type data to different wireless access points through the two wireless radio frequency modules respectively. The wireless access points configured at two adjacent workstations on the target path use different channels for data transmission, and when the smart mobile device is in the overlapping coverage area of the wireless access points corresponding to the two adjacent workstations, the two wireless radio frequency modules simultaneously perform wireless communication with the wireless access points corresponding to the two adjacent workstations. The distance between any two workstations on the target path is greater than or equal to a distance threshold, and the wireless access points configured at the workstations on the target path alternately use a first channel and a second channel for wireless communication. The wireless access points on the target path that use the same channel for wireless communication include a first access point and a second access point, the distance between a first workstation corresponding to the first access point and a second workstation corresponding to the second access point is less than a distance threshold, and the wireless access points configured at the workstations on the target path and the two wireless radio frequency modules all use time division multiple access communication technology for communication connection. There is no wired connection between the wireless access points configured at different workstations on the target path. The wireless node further comprises an Ethernet interface and a processor, the Ethernet interface is connected with the processor, and the processor is connected with the two wireless radio frequency modules. The Ethernet interface is used for communication connection with the controller and receiving the first type data, and the processor is used for copying the first type data into two copies and sending the two copies of the first type data to the two wireless radio frequency modules respectively. The smart mobile device comprises an automatic guided vehicle.

2. The wireless network system for a laneway type scene according to claim 1, wherein, The two wireless radio frequency modules are further used for receiving second type data sent by different wireless access points, and the processor is further used for sending the second type data to the controller through the Ethernet interface.

3. The wireless network system for a tunnel-like scene according to claim 1, wherein, ​

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