Vehicle-to-ground communication network architecture based on ad hoc network

Abstract

The embodiment of the present application provides a vehicle-to-ground communication networking architecture based on a self-organizing network, including: a background network; a fixed station, at least one fixed station is set in a network coverage area; a vehicle-mounted station, the fixed stations located in different network coverage areas are respectively connected to the corresponding vehicle-mounted stations for communication, and the vehicle-mounted stations are used to provide network services for vehicle-mounted terminals according to a dual-frequency roaming frequency hopping scheme; a server, the server is used to process data streams from different network segments, the server is provided with at least one data interface, and different data interfaces are connected to different fixed stations for communication to form different network coverage areas; different network coverage areas are provided with coverage overlap areas, and fixed stations for transmitting network signals at different frequencies are provided in the coverage overlap areas. This communication network architecture can support flexible and scalable elastic networking scale, and can better meet actual business needs.

Description

Technical Field

[0001] The present application relates to the field of rail transit communication networks, and in particular to a vehicle-to-ground communication networking architecture based on a self-organizing network. Background Art

[0002] With the demand for intelligent development of the next generation of urban rail systems, there are a large number of communication needs between the various components of the urban rail system (such as between vehicles, between vehicles and trackside equipment, or between trackside equipment). Traditional urban rail train communication systems adopt a "vehicle-ground-vehicle" networking architecture. The communication between the various components of the urban rail system needs to be transferred through ground networks such as base stations and core networks, resulting in large communication network delays, complex wiring and high costs. Summary of the invention

[0003] In order to solve one of the above technical defects, an embodiment of the present application provides a vehicle-to-ground communication networking architecture based on an ad hoc network, including:

[0004] Backend network;

[0005] A fixed station, the fixed station is used to transmit network signals according to a preset frequency point, the network coverage area and the fixed station are arranged along the track, and at least one fixed station is arranged in one network coverage area;

[0006] The vehicle-mounted station, the fixed stations located in different network coverage areas are respectively connected to the corresponding vehicle-mounted stations for communication, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal according to the dual-band roaming frequency hopping solution;

[0007] The server is respectively connected to the background network and the fixed station in communication; the server is used to process data streams of different network segments, and the server is provided with at least one data interface, and different data interfaces are connected to different fixed stations in communication to form different network coverage areas; different network coverage areas are provided with coverage overlap areas, and fixed stations for transmitting network signals at different frequencies are provided in the coverage overlap areas.

[0008] Optionally, the network transmission module includes:

[0009] The server is respectively connected to the background network and the fixed station in communication; the server is used to process data streams of different network segments, and the server is provided with at least one data interface, and different data interfaces are connected to different fixed stations in communication to form different network coverage areas; different network coverage areas are provided with coverage overlap areas, and fixed stations for transmitting network signals at different frequencies are provided in the coverage overlap areas.

[0010] Optionally, the network coverage area includes at least: a first coverage area, a second coverage area and a coverage overlap area, the first coverage area is correspondingly provided with a first fixed station, the second coverage area is correspondingly provided with a second fixed station, the first fixed station and the second fixed station are provided in the coverage overlap area, and the first fixed station and the second fixed station transmit network signals according to the first frequency and the second frequency, respectively.

[0011] Optionally, the vehicle-mounted station and the fixed station located in the overlapping coverage area are dual-frequency network devices.

[0012] Optionally, the vehicle-mounted station is in a connected state with the first fixed station in the first coverage area and the second fixed station in the second coverage area respectively, and the vehicle-mounted station is in a dual-connected state with the first fixed station and the second fixed station in the overlapping coverage area.

[0013] Optionally, if the vehicle runs into the first coverage area, the vehicle-mounted terminal of the vehicle accesses the first frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the first frequency point;

[0014] If the vehicle moves from the first coverage area to the overlapping coverage area, the vehicle-mounted terminal detects the second frequency point and accesses the second frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the first frequency point and the second frequency point;

[0015] If the vehicle moves from the overlapping coverage area to the second coverage area, the vehicle-mounted terminal disconnects from the first frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the second frequency point.

[0016] Optionally, the network transmission module includes:

[0017] A wired switching network, wherein the wired switching network is communicatively connected to the background network, and the wired switching network is provided with at least one data interface, and different data interfaces are communicatively connected to different fixed stations to form different network coverage areas; wherein different network coverage areas do not overlap, and the frequency points within different network coverage areas are the same.

[0018] Optionally, the vehicle-mounted station is a single-frequency network device, and the vehicle-mounted terminal is a single-frequency terminal.

[0019] Optionally, the vehicle-mounted stations located in different network coverage areas are communicatively connected, and the vehicle-mounted stations located in different network coverage areas use different time slots to send network signals and use full time slot reception.

[0020] Optionally, the network coverage area includes at least: a third coverage area and a fourth coverage area; the third coverage area and the fourth coverage area both use a third frequency point to transmit network signals;

[0021] Wherein, if the vehicle runs to the third coverage area, the vehicle-mounted terminal of the vehicle accesses the third frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the third frequency point and in the first time slot;

[0022] If the vehicle moves from the third coverage area to the fourth coverage area, the vehicle-mounted station is used to provide network services to the vehicle-mounted terminal via the third frequency point and in the second time slot, and the first time slot and the second time slot are different time slots.

[0023] By adopting the communication network architecture provided in the embodiments of the present application, self-organizing network technology can be used to realize communication between vehicles and ground networks, communication between vehicles, and communication between trackside equipment, supporting flexible and scalable elastic networking scale, and better meeting actual business needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] Figure 1 A schematic diagram of a vehicle-to-ground communication networking architecture based on an ad hoc network corresponding to the dual-frequency roaming solution provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of a vehicle-to-ground communication networking architecture based on a self-organizing network corresponding to the single-frequency time division scheme provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0028] In the process of realizing this application, the inventors found that the traditional communication system in the field of rail transit requires the construction of ground base stations, core networks and other equipment. The network architecture is complex and costly, and the network maintenance is difficult. In the communication process between the various components of the communication system, the transmission of the ground network (such as base stations and core networks) is required, and the transmission delay increases. In order to solve the above problems, self-organizing network technology can be used to realize the communication between vehicles and ground networks, between vehicles, and between trackside equipment, which can directly avoid the construction of base stations and core networks. However, self-organizing network technology has the problem of limited network scale. The product performance of different manufacturers is different, and the network scale restrictions are also different. In order to further solve the problem that the scale of ad hoc networks is limited and cannot be applied to the field of subway transportation, an embodiment of the present application provides a vehicle-to-ground communication networking architecture based on ad hoc networks. The vehicle-to-ground communication networking architecture based on ad hoc networks is a large-scale communication expansion architecture for subways based on ad hoc networking technology. The vehicle-to-ground communication networking architecture based on ad hoc networks can be used in rail transportation fields such as subways, trains, and cars, or other fields. The vehicle-to-ground communication networking architecture based on ad hoc networks can break through the scale limitation of ad hoc networks, that is, it can support flexible and scalable elastic networking scale on the premise of realizing ad hoc network communication to meet actual business needs.

[0029] The vehicle-ground communication networking architecture based on ad hoc network includes: a background network 11, a network transmission module 12, a fixed station 13 and a vehicle-mounted station 14; wherein the network transmission module 12 is connected to the background network 11 in communication, and the network transmission module 12 at least includes: a server and / or a wired switching network; the network transmission module 12 is also connected to the fixed station 13 in communication, and the fixed station 13 is used to transmit network signals to the vehicle-mounted station 14 according to a preset frequency point, and at least one fixed station 13 is set in a network coverage area; the fixed stations 13 located in different network coverage areas are respectively connected to the corresponding vehicle-mounted stations 14 in communication, and the vehicle-mounted stations 14 are used to provide network services to the vehicle-mounted terminals 15 according to the corresponding network coverage areas. Therefore, the industry has studied the use of ad hoc network technology to realize the communication of subway trains, which can directly avoid the construction of base stations and core networks, but ad hoc networks have their application defects, that is, the network scale is limited, the product performance of different manufacturers is different, and the network scale limit is also different. This network architecture can break through the scale limitation of self-organizing networks, that is, it supports flexible and scalable elastic networking scale under the premise of realizing self-organizing network communication, and provides technical guarantee for the application of self-organizing networks in the field of subway communications.

[0030] It should be noted that at least one onboard station is set on each train, and the location of the onboard station can be determined according to actual needs. For example, one onboard station can be set at the front and rear of the train respectively, and one train can be set with two onboard stations.

[0031] In the embodiment of the present application, the background network is connected to the network transmission module 12 through an Ethernet service interface, and the background network is used to provide network services for the vehicle-mounted terminal 15. The network transmission module 12 is used to form a network according to the configuration of the vehicle-mounted terminal 15 (or called a service terminal). The vehicle-mounted station 14 and the fixed station 13 are both trackside network devices, which are used to provide network services to the vehicle-mounted terminal 15 of passing vehicles. Specifically, the fixed station 13 is used to transmit a network signal to the vehicle-mounted station 14 according to a preset frequency, and the vehicle-mounted station 14 is connected to the vehicle-mounted terminal 15 through an Ethernet interface to provide network services for the vehicle-mounted terminal 15.

[0032] In the embodiment of the present application, the vehicle-ground communication networking architecture based on the self-organizing network can be compatible with the standard Mesh protocol, without changing the Mesh protocol, and there is no requirement for Mesh product manufacturers. It can be understood that without changing the standard Mesh protocol, the limitation of the scale of self-organizing network equipment can be broken, which is helpful to promote the application of Mesh self-organizing network in rail transportation communication and more fields.

[0033] Furthermore, the embodiments of the present application may adopt a dual-frequency roaming frequency hopping solution and / or a single-frequency time division solution. By using the above two solutions independently or in combination, the number of devices in a single network can be increased, the limitation on the number of traditional self-organizing network devices can be broken, and flexible network deployment applications can be achieved based on business needs. It should be noted that the above two solutions are only two preferred ways to solve the problem of limited number of self-organizing network devices. The embodiments of the present application are not limited to the above two solutions. The above two solutions are used as examples for explanation.

[0034] Solution 1: Dual-band roaming frequency hopping solution

[0035] Generally, due to the shape characteristics of vehicle traffic routes (such as subways or trains, etc.), the networking methods along vehicle traffic routes mostly adopt linear networking. In the linear networking method, there are no multiple neighboring areas of the mobile cellular network, nor is there a distinction between channel types. Considering the use of multi-channel multi-line automatic roaming frequency hopping, it is a key technology to solve long-distance, large-capacity networking. In order to solve the problem of limited network scale of self-organizing networks, the embodiment of the present application is based on multi-channel multi-line automatic roaming frequency hopping technology, and optimizes the frequency reuse scheme according to factors such as site distribution, line terrain, and the location of access points. For example: solving the problem of limited network scale of self-organizing networks through dual-channel cross-allocation is a relatively simple solution. From the perspective of frequency reuse, it also occupies the least frequency band resources. It is the best technical choice in the field of subway communications with limited spectrum resources.

[0036] See also Figure 1In order to meet the networking needs in the field of rail transit, a dual-frequency roaming frequency hopping solution can be adopted. The on-board terminal supports the dual-frequency automatic roaming function, and the single-frequency on-board stations are cross-deployed in different areas beside the track. There is an overlap between two adjacent network coverage areas. The overlapping area is the coverage overlap area. The device frequencies in the coverage overlap area are the two frequencies of the on-board terminal. In order to ensure continuous coverage of the coverage overlap area. Due to the existence of dual-frequency overlapping coverage areas, the dual-band on-board terminal will communicate with the on-board stations beside the track of two frequency bands at the same time, and data streams of different frequency bands will communicate between the vehicle and the ground at the same time, which may cause data duplication problems.

[0037] Continue to see Figure 1 In the dual-band roaming frequency hopping solution, the network transmission module at least includes: a server 121 for converging the network, the server 121 is respectively connected to the background network and the fixed station; the server 121 is provided with at least one data interface, different data interfaces are connected to different fixed stations to form different network coverage areas; different network coverage areas are provided with coverage overlap areas, and fixed stations for transmitting network signals at different frequencies are provided in the coverage overlap areas. In this way, the data streams of different network segments can be processed, compared and deduplicated by the server 121 to ensure the continuous and smooth data transmission between the vehicle terminal and the background network, and at the same time, combined with the dual-band network to achieve lossless network switching.

[0038] Continue to see Figure 2 , the network coverage area at least includes: a first coverage area (or subnet A), a second coverage area (or subnet B) and a coverage overlap area, the first coverage area is correspondingly provided with a first fixed station, the second coverage area is correspondingly provided with a second fixed station, the coverage overlap area is provided with a first fixed station and a second fixed station, the first fixed station and the second fixed station transmit network signals according to a first frequency point and a second frequency point respectively. The vehicle-mounted station is a dual-frequency network device or a multi-frequency network device. The vehicle-mounted station is respectively connected to the first fixed station in the first coverage area and the second fixed station in the second coverage area, and the vehicle-mounted station is connected to the first fixed station and the second fixed station in the coverage overlap area.

[0039] When the vehicle runs along the track, if the vehicle runs to the first coverage area, the on-board terminal of the vehicle accesses the first frequency point, and the on-board station is used to provide network services for the on-board terminal through the first frequency point; if the vehicle runs from the first coverage area to the coverage overlapping area, the on-board terminal detects the second frequency point and accesses the second frequency point, and the on-board station is used to provide network services for the on-board terminal through the first frequency point and the second frequency point; if the vehicle runs to the second coverage area, the on-board terminal accesses the second frequency point, and the on-board station is used to provide network services for the on-board terminal through the second frequency point.

[0040] For example: the vehicle terminal frequencies are f1 and f2, and the frequencies covering the overlapping area (or called the crossover area) are f1 and f2 respectively. During the operation of the vehicle, when the vehicle dual-frequency terminal passes through the network coverage area corresponding to the f1 frequency, it uses the f1 frequency for vehicle-to-ground communication; when the vehicle passes through the overlapping coverage area, the vehicle dual-frequency terminal automatically detects the f2 frequency and roams to the f2 frequency for communication. At this time, the f1 frequency and the f2 frequency are used for communication at the same time to ensure continuous coverage of communication; when the vehicle passes through the network coverage area corresponding to the f2 frequency, the vehicle dual-frequency terminal automatically disconnects from the f1 frequency and only uses the f2 frequency for communication. This mode is used for communication in subsequent cycles.

[0041] In summary, in the dual-band roaming frequency hopping solution, different network coverage areas are covered by fixed stations of different frequencies to improve the overall network scale, capacity and service throughput. In the edge area of ​​network coverage, dual-band fixed stations are arranged at about 2 points to ensure that adjacent network coverage areas have sufficient coverage overlap areas. The vehicle-mounted station uses a dual-band vehicle-mounted station to ensure the simultaneous access capability of dual frequencies, and the dual-band vehicle-mounted station cooperates with the server 121 to process data. During the movement of the vehicle, 1 to 2 networks are always maintained with corresponding transmission capabilities to ensure the stability of data transmission.

[0042] It should be noted that the advantage of the dual-frequency roaming frequency hopping solution is that it can achieve an unlimited number of network devices through dual-frequency spatial multiplexing. The disadvantage is that the dual-frequency equipment is more expensive, requires more frequency resources, and consumes more resources for public signaling in a single frequency band. To this end, the embodiment of the present application proposes a single-frequency point time division solution. Compared with the dual-frequency roaming solution, the single-frequency point solution is simpler to network.

[0043] Solution 2: Single frequency time division solution

[0044] In order to implement the single-frequency time division scheme, the vehicle-mounted terminal uses a single-frequency terminal, and the trackside equipment also uses single-frequency equipment, including vehicle-mounted stations and fixed stations. The trackside equipment is divided into different network coverage areas (or subnets). Devices located in different network coverage areas use different time slots for transmission, but receive using full time slots. In other words, the vehicle-mounted terminal can be installed with ordinary single-frequency devices, and different subnets are cross-deployed in different areas on the trackside. Each subnet is a single-frequency device, but uses different time slots for transmission. There is no need for overlapping coverage between the two subnets, and the devices in the subnet can communicate with each other. Therefore, continuous coverage of different subnets can be achieved without overlapping between the two subnets.

[0045] In the single-frequency time-division scheme, the following requirements are imposed on the network, vehicles, and data:

[0046] 1) Network requirements: The requirements for the network are as follows: different areas are covered by fixed stations with the same frequency but different time slots to improve the overall scale and capacity of the network; seamless coverage is achieved without overlapping area interfaces in the coverage edge areas of each sub-network;

[0047] 2) Vehicle requirements: A single-band vehicle-mounted radio is sufficient;

[0048] 3) Data requirements: When the vehicle is moving, different time slots are used for communication, and the vehicle terminal has full time slot communication capabilities; no aggregation server cooperation is required.

[0049] See also Figure 2 In a single-frequency time-division scheme, the network transmission module includes: a wired switching network 122, the wired switching network 122 is communicatively connected to the background network, the wired switching network 122 is provided with at least one data interface, and different data interfaces are communicatively connected to different fixed stations to form different network coverage areas; wherein different network coverage areas do not overlap, and the frequencies within different network coverage areas are the same.

[0050] In an embodiment of the present application, the vehicle-mounted station is a single-frequency network device, and the vehicle-mounted terminal is a single-frequency terminal. The vehicle-mounted stations located in different network coverage areas are connected in communication, and the vehicle-mounted stations located in different network coverage areas use different time slots to send network signals and use full time slot reception. The sending time slots can be divided according to logic and protocol, that is, the time slots occupied to send information can be determined according to logic and protocol. All fixed station nodes are actually fully capable and can receive all information, so fixed stations in different subnets can receive information sent by fixed stations in other adjacent subnets.

[0051] The network coverage area at least includes: a third coverage area and a fourth coverage area; the third coverage area and the fourth coverage area both use the third frequency point to transmit network signals; wherein, if the vehicle runs to the third coverage area, the vehicle-mounted terminal of the vehicle accesses the third frequency point, and the vehicle-mounted station is used to provide network services to the vehicle-mounted terminal through the third frequency point and in the first time slot; if the vehicle runs from the third coverage area to the fourth coverage area, the vehicle-mounted station is used to provide network services to the vehicle-mounted terminal through the third frequency point and in the second time slot, and the first time slot and the second time slot are different time slots. In this way, different subnet devices use different time slots for transmission, and each subnet only needs to exchange necessary synchronization information, which greatly reduces the data flow. The single-frequency time division scheme utilizes the orthogonality in time, and different subnets expand the number of devices through the reuse of time slots, which can support up to several thousand devices and meet the application requirements of most scenarios.

[0052] For example, the frequency of the vehicle terminal is f1, and the frequency of each subnet in the trackside area is also f1. During the operation of the vehicle, when the vehicle terminal passes through subnet A, it uses a specific time slot of frequency f1 for vehicle-ground communication; when the vehicle passes through subnet B, it also uses f1 but uses another specific time slot for communication, and the subsequent cycles use this mode for communication.

[0053] The single-frequency time-division scheme has the same requirements for equipment and frequency as the standard network, and has a lower cost. Different subnet devices use different time slots for transmission, and each subnet only needs to exchange necessary synchronization information, which greatly reduces the data flow. The single-frequency time-division scheme uses the orthogonality of time. Different subnets can expand the number of devices through the reuse of time slots, which can support up to thousands of devices and meet the application requirements of most scenarios. However, the time-division mode has a certain impact on the network throughput. The actual commercial project team can choose according to project requirements, business volume and budget.

[0054] It should be noted that different solutions can be adopted according to different business requirements (such as bandwidth, latency, throughput, etc.), on-site conditions, etc., or the above two solutions can be integrated. For example: in the dual-band roaming frequency hopping solution, since the public signaling in each frequency band consumes more resources, the networking scale of the equipment cannot be too large, otherwise the available resources will be reduced. If the networking scale of the equipment in a single frequency band is too low, the dual-band roaming frequency hopping will be too frequent, which will also cause performance degradation. Therefore, in the dual-band roaming frequency hopping solution, a single-frequency point time division solution can be used simultaneously in each single-frequency band networking area, which can effectively reduce the consumption of public signaling resources in the area and increase the number of networking devices that can be supported in a single frequency band, so as to further improve the networking scale of the entire network.

[0055] It should be emphasized that the limitation on the number of devices in self-organizing networks has been broken through through the new networking solutions and protocols. The above two solutions can be used independently or in combination, laying the foundation for complex large-scale commercial applications in the future. The large-scale application solution does not require modification of the standard Mesh protocol, there is no customized change, the implementation cost is low, and it is conducive to commercial promotion. That is, the network access of the dual-frequency roaming frequency modulation solution and the single-frequency time division solution both adopt the Mesh protocol, the single-frequency time division solution uses ordinary equipment to set the time slot parameters; the dual-frequency roaming frequency hopping solution vehicle-mounted station needs to use dual-frequency equipment. It can be determined based on equipment selection and parameter settings whether to use the single-frequency time division solution or the dual-frequency roaming frequency hopping solution.

[0056] In the embodiment of the present application, the network networking architecture can be used to flexibly network according to business needs and on-site conditions. The new networking solution and frequency reuse and time division multiplexing technologies can break through the limitations of equipment scale. There is no customization requirement for Mesh devices. Just turn on the corresponding software functions, and the network architecture is simple.

[0057] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0058] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0059] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0060] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0063] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A vehicle-to-ground communication networking architecture based on ad hoc networking, characterized in that: include: Backend network; A fixed station, the fixed station is used to transmit network signals according to a preset frequency point, the network coverage area and the fixed station are arranged along the track, and at least one fixed station is arranged in one network coverage area; The vehicle-mounted station, the fixed stations located in different network coverage areas are respectively connected to the corresponding vehicle-mounted stations for communication, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal according to the dual-band roaming frequency hopping solution; a server, wherein the server is respectively connected to the background network and the fixed station in communication; the server is used to process data streams of different network segments, and the server is provided with at least one data interface, and different data interfaces are connected to different fixed stations in communication to form different network coverage areas; different network coverage areas are provided with coverage overlap areas, and fixed stations for transmitting network signals at different frequencies are provided in the coverage overlap areas; The network coverage area at least includes: a first coverage area, a second coverage area and a coverage overlap area, the first coverage area is correspondingly provided with a first fixed station, the second coverage area is correspondingly provided with a second fixed station, the first fixed station and the second fixed station are provided in the coverage overlap area, and the first fixed station and the second fixed station transmit network signals according to a first frequency point and a second frequency point respectively; The vehicle-mounted station and the fixed station located in the overlapping coverage area are dual-frequency network devices.

2. The vehicle-to-ground communication networking architecture based on ad hoc networking according to claim 1 is characterized in that: The vehicle-mounted station is connected to the first fixed station in the first coverage area and the second fixed station in the second coverage area respectively, and is dual-connected to the first fixed station and the second fixed station in the overlapping coverage area.

3. The vehicle-to-ground communication networking architecture based on ad hoc networking according to claim 1 is characterized in that: If the vehicle runs into the first coverage area, the vehicle-mounted terminal of the vehicle accesses the first frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the first frequency point.

4. The vehicle-to-ground communication networking architecture based on ad hoc networking according to claim 3 is characterized in that: If the vehicle moves from the first coverage area to the overlapping coverage area, the vehicle-mounted terminal detects the second frequency point and accesses the second frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the first frequency point and the second frequency point; If the vehicle moves from the overlapping coverage area to the second coverage area, the vehicle-mounted terminal disconnects from the first frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the second frequency point.

5. The vehicle-to-ground communication networking architecture based on ad hoc networking according to any one of claims 1 to 4, characterized in that: Also includes: A wired switching network, wherein the wired switching network is communicatively connected to the background network, and the wired switching network is provided with at least one data interface, and different data interfaces are communicatively connected to different fixed stations to form different network coverage areas; wherein different network coverage areas do not overlap, and the frequency points within different network coverage areas are the same.

6. The vehicle-to-ground communication networking architecture based on ad hoc networking according to claim 5 is characterized in that: The vehicle-mounted station is a single-frequency network device, and the vehicle-mounted terminal is a single-frequency terminal.

7. The vehicle-to-ground communication networking architecture based on ad hoc networking according to claim 5 is characterized in that: The vehicle-mounted stations located in different network coverage areas are connected in communication, and the vehicle-mounted stations located in different network coverage areas use different time slots to send network signals and use full time slots for reception.

8. The vehicle-to-ground communication networking architecture based on ad hoc networking according to claim 7 is characterized in that: The network coverage area at least includes: a third coverage area and a fourth coverage area; the third coverage area and the fourth coverage area both use a third frequency point to transmit network signals; Wherein, if the vehicle runs to the third coverage area, the vehicle-mounted terminal of the vehicle accesses the third frequency point, and the vehicle-mounted station is used to provide network services for the vehicle-mounted terminal through the third frequency point and in the first time slot; If the vehicle runs from the third coverage area to the fourth coverage area, the vehicle-mounted station is used to provide network services to the vehicle-mounted terminal via the third frequency point and in the second time slot, and the first time slot and the second time slot are different time slots.

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