Horizontal transportation ad hoc network wireless communication system and method in shield operation scene

Abstract

The invention discloses a horizontal transportation ad hoc network wireless communication system and method in a shield operation scene, and relates to the technical field of communication in the shield operation scene. The system comprises a ground control center, an optical fiber switch arranged at a tunnel exit, a first terminal device arranged at the tunnel exit, a second terminal device arranged on a tunnel transport vehicle and a third terminal device arranged on a shield tunneling machine. The optical fiber switch is in communication connection with the ground control center; the second terminal device is in wireless communication connection with the first terminal device and the third terminal device. According to the invention, less relay equipment or base station equipment can be adopted, even no relay equipment or base station equipment is needed, wireless communication in a shield operation scene is ensured, the work amount and the labor cost can be effectively reduced, and the maintenance cost can also be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of communication technology in shield operation scenarios, and in particular to a horizontal transport ad hoc network wireless communication system and method in shield operation scenarios. Background Art

[0002] Currently, shield tunneling accounts for over 90% of the operating mileage of urban rail transit lines. During shield tunnel construction, the tunnel area is a continuous process, making it impossible to install fixed network base stations to provide network services. During shield tunneling, electric vehicles are required to transport materials, debris, and other cargo horizontally between the tunnel exit and the shield machine. During transportation, these vehicles need to communicate with personnel at the tunnel exit and the shield machine area to communicate their location and coordinate the loading and unloading of materials such as segments. Furthermore, because the track on which the electric vehicles operate is manually laid during shield tunneling, quality assurance is difficult. Electric vehicles may derail during operation, requiring the driver to communicate with the shield machine and tunnel exit personnel to reposition the vehicle using a jack and the assistance of multiple personnel. Therefore, a communication system for horizontal transportation in shield tunneling operations is essential.

[0003] Currently, only shield machines use optical fiber connections to ensure stable communication with ground control centers during shield tunneling operations. As shield machines advance, fiber optic cables are gradually being laid, making construction more complex. There are two main types of wireless communication in shield tunneling scenarios:

[0004] 1) Radio intercom method, specifically:

[0005] The electric vehicle driver, the tunnel exit staff, and the shield machine staff each carried a walkie-talkie and communicated via radio. However, due to the long length of the shield tunnel and the presence of curves, the communication range could not cover the entire tunnel area. Furthermore, the radio intercom only allowed for conversations and could not transmit relevant information or data.

[0006] 2) How to lay Wi-Fi base stations along the way, specifically:

[0007] Wi-Fi base stations can be installed along the tunnel during shield tunneling to ensure smooth wireless communication within the tunnel. Current Wi-Fi deployments require deploying a base station every 3-400 meters, connected to a network cable at the tunnel exit. Because the shield tunneling process is continuous, communications engineers must be dispatched every three to four days to deploy the base stations and connect network and power cables. This requires significant engineering effort and labor costs. The large number of Wi-Fi base stations also increases hardware and maintenance costs. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to address the deficiencies of the existing technology and specifically provide a horizontal transport ad hoc network wireless communication system and method in a shield operation scenario, specifically as follows:

[0009] 1) In the first aspect, the present invention provides a horizontal transport ad hoc wireless communication system in a shield tunneling operation scenario, and the specific technical solution is as follows:

[0010] It includes a ground control center, a fiber optic switch installed at the tunnel exit, a first terminal device installed at the tunnel exit, a second terminal device installed on the tunnel transport vehicle, and a third terminal device installed on the shield machine;

[0011] The optical fiber switch is connected to the ground control center for communication;

[0012] The second terminal device is wirelessly connected to the first terminal device and the third terminal device respectively.

[0013] The beneficial effects of the horizontal transport ad hoc network wireless communication system in a shield operation scenario provided by the present invention are as follows:

[0014] Fewer relay devices or base station devices can be used, or even no relay devices or base station devices are used, to ensure wireless communication in shield operation scenarios, which can effectively reduce engineering workload and labor costs, and can also effectively reduce maintenance costs.

[0015] On the basis of the above solution, the horizontal transport ad hoc network wireless communication system in a shield operation scenario of the present invention can also be improved as follows.

[0016] Furthermore, it also includes a relay device, which is wirelessly connected to the first terminal device, the second terminal device and the third terminal device respectively.

[0017] Furthermore, wireless communication is performed between the relay device, the first terminal device, the second terminal device and the third terminal device through Mesh networking.

[0018] The beneficial effects of adopting the above-mentioned further scheme are: the relay equipment of the wireless communication adopts a jumper method to avoid the workload caused by laying additional network cables; the system of the present invention has the ability of self-organizing networking. As the shield machine advances, the added relay equipment can automatically join the network after power-on, and the on-site construction personnel can operate it without the need to dispatch professional communication engineers to perform network settings on site; the wireless communication network and the shield machine network form a ring network, which improves the risk resistance of communication.

[0019] Furthermore, when any two devices among the ground control center, the fiber optic switch, the relay device, the first terminal device, the second terminal device and the third terminal device communicate with each other, the communication link with the lowest delay between the two devices is used for communication.

[0020] Furthermore, the tunnel transport vehicle is an electric vehicle.

[0021] Furthermore, the optical fiber switch is communicatively connected to the third terminal device.

[0022] Furthermore, the optical fiber switch and the third terminal device communicate with each other via optical fiber.

[0023] Furthermore, the optical fiber switch communicates with the ground control center via optical fiber.

[0024] Furthermore, intercom equipment is installed on the first terminal device, the second terminal device and the third terminal device.

[0025] 2) In a second aspect, the present invention further provides a wireless communication method for a horizontal transport ad hoc network in a shield operation scenario, using the above-mentioned wireless communication system for a horizontal transport ad hoc network in a shield operation scenario with a relay device, the method comprising:

[0026] Real-time monitoring of the extension of each communication link between any two devices among the ground control center, the optical fiber switch, the relay device, the first terminal device, the second terminal device, and the third terminal device;

[0027] When any two devices among the ground control center, the optical fiber switch, the relay device, the first terminal device, the second terminal device and the third terminal device communicate with each other, the communication link with the lowest delay between the two devices is used for communication.

[0028] It should be noted that the beneficial effects achieved by the technical solution of the second aspect of the present invention and the corresponding possible implementation methods can be found in the above-mentioned technical effects of the first aspect and its corresponding possible implementation methods, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments of the present invention:

[0030] Figure 1 This is one of the structural diagrams of a horizontal transport ad hoc network wireless communication system in a shield operation scenario according to an embodiment of the present invention;

[0031] Figure 2 This is a second structural diagram of a horizontal transport ad hoc network wireless communication system in a shield operation scenario according to an embodiment of the present invention;

[0032] Figure 3 The present invention is a flowchart of a method for wireless communication of a horizontal transport ad hoc network in a shield operation scenario according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0034] The following describes in detail the technical solution of the present invention and how the technical solution of the present invention solves the above-mentioned technical problems using specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The following embodiments of the present invention are described in conjunction with the accompanying drawings.

[0035] like Figure 1 As shown, a horizontal transport ad hoc network wireless communication system in a shield operation scenario according to an embodiment of the present invention includes a ground control center, a fiber optic switch arranged at a tunnel exit, a first terminal device arranged at the tunnel exit, a second terminal device arranged on a tunnel transport vehicle, and a third terminal device arranged on a shield machine;

[0036] The optical fiber switch is connected to the ground control center for communication;

[0037] The second terminal device is wirelessly connected to the first terminal device and the third terminal device respectively.

[0038] Among them, the second terminal devices can be set on multiple vehicles according to actual conditions.

[0039] Optionally, the above technical solution further includes a relay device, which is wirelessly connected to the first terminal device, the second terminal device and the third terminal device respectively.

[0040] Among them, multiple relay devices can be set according to actual conditions.

[0041] Optionally, in the above technical solution, wireless communication is performed between the relay device, the first terminal device, the second terminal device and the third terminal device through Mesh networking.

[0042] Optionally, in the above technical solution, when communication is performed between any two devices among the ground control center, fiber optic switch, relay device, first terminal device, second terminal device and third terminal device, the communication link with the lowest delay between the two devices is used for communication.

[0043] Optionally, any two of the above devices are recorded as the first device and the second device. When an abnormality occurs in the communication link with the lowest delay between the first device and the second device, and the first device sends communication data to the second device, the ground control center controls the first device to stop sending communication data, and sends a data delay sending instruction to the second device, and sets a mark for the communication data. The data delay sending instruction includes the mark set for the communication data and the sending time of the communication data.

[0044] The ground control center obtains all communication links associated with the first device and the second device, which are recorded as backup communication links. In each backup communication link, the first device can communicate with the second device through other devices. A knowledge graph is constructed based on all the backup communication links. The nodes in the knowledge graph are devices. There are three edges connecting any two nodes in the knowledge graph. The lengths of the three edges are respectively represented by: the communication rate, delay and packet loss rate between the two nodes. Among them, the functional relationship between the communication rate and the length of the edge corresponding to the communication rate is preset, the functional relationship between the delay and the length of the edge corresponding to the delay is preset, and the functional relationship between the packet loss rate and the length of the edge corresponding to the packet loss rate is preset. The three functional relationships are all negatively correlated and linear. That is, the faster the communication rate, the smaller the length of the edge corresponding to the communication rate, the smaller the delay, the smaller the length of the edge corresponding to the delay, the smaller the packet loss rate, and the smaller the length of the edge corresponding to the packet loss rate. The specific expressions of these two functional relationships can be set according to actual conditions.

[0045] The ground control center decomposes the knowledge graph into three sub-knowledge graphs: the first sub-knowledge graph, the second sub-knowledge graph, and the third sub-knowledge graph. The edges in the first sub-knowledge graph correspond to the communication rate, the edges in the second sub-knowledge graph correspond to the delay, and the edges in the third sub-knowledge graph correspond to the packet loss rate. The ground control center constructs proximity matrices corresponding to the first, second, and third sub-knowledge graphs and inputs them into a pre-trained deep learning model. The communication probability between every two nodes is calculated, and the product of all communication probabilities on each backup communication link is calculated and used as the communication probability for each backup communication link. The first device is then controlled to send marked communication data to the second device via the backup communication link with the highest communication probability. After receiving the marked communication data, the second device parses the communication data, determines the data delay transmission instruction corresponding to the tag, obtains the sending time of the communication data, and records the receiving time of the communication data to facilitate backtracking of the communication data process.

[0046] Among them, the ground control center constructs a neural network model such as a neural network, takes the proximity matrix corresponding to the first sub-knowledge graph of the historical knowledge graph, the proximity matrix corresponding to the second sub-knowledge graph, and the proximity matrix corresponding to the third sub-knowledge graph as the input of the neural network, and takes the historical communication probability as the output to train the neural network to obtain a trained neural network. The communication probability between any two nodes refers to: during the communication process, the proportion of the number of data transmissions through the two nodes to the total number of data transmissions during the communication process. A high communication probability between the two nodes indicates that the communication between the two nodes is more reliable. This indicator can be quantified through the communication probability to provide data support for selecting a suitable backup communication link.

[0047] Optionally, in the above technical solution, the tunnel transport vehicle is an electric vehicle.

[0048] Optionally, in the above technical solution, the fiber optic switch is communicatively connected to the third terminal device.

[0049] Optionally, in the above technical solution, the optical fiber switch and the third terminal device communicate with each other via optical fiber.

[0050] Optionally, in the above technical solution, the optical fiber switch and the ground control center communicate via optical fiber.

[0051] Optionally, in the above technical solution, intercom devices are installed on the first terminal device, the second terminal device and the third terminal device.

[0052] like Figure 2 As shown, an embodiment of the present invention is a horizontal transport self-organizing network wireless communication system in a shield operation scenario, including: a ground control center, a relay device, a fiber optic switch arranged at the tunnel exit, a first terminal device arranged at the tunnel exit, a second terminal device arranged on the tunnel transport vehicle and a third terminal device arranged on the shield machine.

[0053] Among them, the ground control center is: a control center built on the ground, used for the overall scheduling and control of the shield project, and for real-time monitoring of the extension of each communication link between any two devices among the ground control center, fiber optic switch, relay equipment, first terminal equipment, second terminal equipment and third terminal equipment. When communication is carried out between any two devices among the ground control center, fiber optic switch, relay equipment, first terminal equipment, second terminal equipment and third terminal equipment, the communication link with the lowest delay between the two devices is used for communication.

[0054] Among them, the optical fiber switch is deployed at the tunnel exit, connecting the ground control center and the first terminal device and the third terminal device through optical fiber.

[0055] Among them, the relay equipment is deployed at the turning point of the tunnel to realize the relay function. There is no need to connect the network cable separately, and wireless communication can be achieved by jumping.

[0056] Among them, the third terminal device deployed on the shield machine is connected to the wireless communication network to realize wireless communication with the second terminal device deployed on the electric vehicle, and at the same time forms a ring network with the optical fiber network to ensure stable communication in the event of optical fiber communication failure.

[0057] Among them, the second terminal device deployed on the electric vehicle is connected to the wireless communication network to realize communication between the electric vehicle and the shield machine and the ground control center respectively.

[0058] Among them, the second terminal device and the third terminal device are both wireless communication terminals, the first terminal device can perform both wireless communication and wired communication, and the relay device can perform wireless communication.

[0059] The relay terminal is wirelessly connected to the first, second, and third terminal devices, respectively. The fiber optic switch communicates with the third terminal device via optical fiber. The fiber optic switch communicates with the ground control center via optical fiber. The tunnel transport vehicle is a battery-powered vehicle. The relay terminal, the first, second, and third terminal devices communicate wirelessly via a mesh networking scheme, and the fiber optic switch is communicatively connected to the third terminal device. In other words, the present invention utilizes wireless mesh technology to enable wireless communication between the relay terminal, the first, second, and third terminal devices. In a traditional WLAN, each client accesses the network via a wireless link connected to an access point (AP). To communicate with each other, users must first access a fixed AP. This network structure is called a single-hop network. In a wireless mesh network, however, any wireless device node can also function as a router. Every node in the network can send and receive signals, and each node can communicate directly with one or more peer nodes. The greatest advantage of this structure is that data packets can be routed to the next nearest node for transmission based on network conditions until they reach their final destination. This multi-hop access method allows for long-distance wireless data communication without deploying network cables. It has the following specific features:

[0060] 1) Self-organization: Network nodes and authorized end users can instantly join the network, expand network coverage, and connect to all other nodes.

[0061] 2) Self-healing: If a device in the network fails or is removed from its topological position, the network automatically adapts to the change. Even if the connection between the originating and remote ends involves multiple relay devices, the network will find a new route from the originating end to the remote end.

[0062] 3) Multi-hop: Each network node and user terminal device (wireless communication unit) can forward and route data packets sent to another end, and can select and determine the best route from the source to the other end.

[0063] 4) Peer-to-peer network: Self-organizing networks are usually composed of equal network elements. As long as the distance between the initiator and the peer is close enough, they can be directly connected without going through a central management node.

[0064] 5) Multi-channel negotiation improves bandwidth utilization: A coordination mechanism in wireless mesh networks for multi-channel access ensures that both communicating nodes operate on the same channel. The timeline is divided into beacon intervals. At the beginning of each beacon interval, a time window called the ATIM is established. Within the same ATIM window, nodes with data to send use the same channel as the receiving end using control messages. This multi-channel negotiation method aims to select channels with light traffic loads, balancing channel loads as much as possible and reducing bandwidth wasted due to contention and backoff.

[0065] The beneficial effects of the present invention are as follows:

[0066] 1) Fewer relay devices: The system uses mesh-based wireless communication, enabling long-distance wireless communication within tunnels. In straight tunnels, two devices can communicate over a distance of 8-10 kilometers, and even in curved tunnels, a communication distance of 2-3 kilometers is guaranteed. Conventional shield tunneling sections typically do not exceed 5 kilometers, and wireless communication coverage of the entire shield tunneling area can be achieved by simply setting up a single relay terminal in the tunnel. With a small number of relay devices that eliminate the need for laying network cables, wireless communication can be achieved throughout the entire tunnel during shield tunneling operations, reducing the hardware cost of wireless networking in these scenarios.

[0067] 2) Convenient Networking: The system enables communication via multi-point hopping, eliminating the need for relay equipment to lay network cables. Even in long tunnels or those with numerous curves, network expansion can be achieved by simply adding relay terminals at the corresponding locations, eliminating the significant workload associated with laying cables. Furthermore, the system is self-healing; new terminals automatically join the network upon power-up, enabling on-site deployment without the need for specialized communications personnel. Wireless network equipment is easily deployed and can be reused across multiple tunneling sections.

[0068] 3) Improve shield tunneling efficiency: Each node in the system can send and receive tasks, and can transmit the operating status and location data of the battery car to the tunnel exit, shield machine, and ground center. This not only facilitates the coordination of vertical transportation personnel at the tunnel exit and material handling personnel at the shield machine. In shield operation scenarios that require multiple battery cars for transportation, the ground center can perform fine-grained scheduling based on the transportation location of each battery car to improve shield construction efficiency. If there is a battery car transmission failure or derailment, it can be promptly notified and handled as soon as possible, realizing wireless communication of data between the battery car, shield machine, and ground center, facilitating the overall scheduling of the shield project and improving construction efficiency.

[0069] 4) Ring Network Redundancy: The system's wireless communication equipment and the shield machine's fiber optic links form a ring network design. This ensures normal communication even in the event of a single point of failure in the fiber or relay terminal. This improves network communication resilience during shield construction and reduces the impact of communication failures on construction. The wireless network and the shield machine's fiber optic network form a ring network, preventing network paralysis caused by a single failure.

[0070] 5) Expanded functions: The system's vehicle-mounted, relay and other terminal devices can be expanded to include intercom equipment, enabling real-time communication between staff at each location based on the wireless network, facilitating communication between staff at all levels.

[0071] like Figure 3 As shown, a wireless communication method for a horizontal transport ad hoc network in a shield operation scenario according to an embodiment of the present invention adopts the wireless communication system for a horizontal transport ad hoc network in a shield operation scenario with a relay device, and the method includes:

[0072] S1. Real-time monitoring of the extension of each communication link between any two devices among the ground control center, the optical fiber switch, the relay device, the first terminal device, the second terminal device, and the third terminal device;

[0073] S2. When any two devices among the ground control center, the fiber optic switch, the relay device, the first terminal device, the second terminal device, and the third terminal device communicate with each other, the communication link with the lowest delay between the two devices is used for communication.

[0074] In the above embodiments, although the steps are numbered S1, S2, etc., these are only specific embodiments given by the present invention. Those skilled in the art may adjust the execution order of S1, S2, etc. according to actual conditions, which is also within the scope of protection of the present invention. It can be understood that in some embodiments, some or all of the above embodiments may be included.

[0075] It should be noted that the beneficial effects of the wireless communication method for horizontal transport in a shield tunneling operation scenario provided in the above embodiment are the same as the beneficial effects of the wireless communication system for horizontal transport in a shield tunneling operation scenario provided in the above embodiment, and will not be repeated here. In addition, the method and system embodiments provided in the above embodiment belong to the same concept, and their specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0076] The above description is merely a preferred embodiment of the present invention and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure involved in the present invention is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also includes other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in the present invention.

[0077] It should be noted that the terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects and to define a specific order or precedence. Where appropriate, the order used for similar objects may be interchanged, such that the embodiments of the present application described herein can be implemented in an order other than the order shown or described.

[0078] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A horizontal transport ad hoc network wireless communication system in a shield operation scenario, characterized in that: It includes a ground control center, a fiber optic switch arranged at a tunnel exit, a first terminal device arranged at the tunnel exit, a second terminal device arranged on a tunnel transport vehicle, and a third terminal device arranged on a shield machine; The optical fiber switch is communicatively connected with the ground control center; The second terminal device is wirelessly connected to the first terminal device and the third terminal device respectively.

2. According to the horizontal transport ad hoc network wireless communication system in shield operation scenario of claim 1, it is characterized in that: It also includes a relay device, which is wirelessly connected to the first terminal device, the second terminal device and the third terminal device respectively.

3. According to the wireless communication system for horizontal transportation ad hoc network in shield operation scenario of claim 2, it is characterized in that: The relay device, the first terminal device, the second terminal device and the third terminal device perform wireless communication via Mesh networking.

4. According to the wireless communication system for horizontal transportation ad hoc network in shield operation scenario of claim 3, it is characterized in that: When any two of the ground control center, the optical fiber switch, the relay device, the first terminal device, the second terminal device and the third terminal device communicate with each other, the communication link with the lowest delay between the two devices is used for communication.

5. The horizontal transport ad hoc network wireless communication system in a shield operation scenario according to claim 1 is characterized in that: The tunnel transport vehicle is a battery vehicle.

6. The horizontal transport ad hoc network wireless communication system in a shield operation scenario according to claim 1, characterized in that: The optical fiber switch is communicatively connected to the third terminal device.

7. The horizontal transport ad hoc network wireless communication system in a shield operation scenario according to claim 6 is characterized in that: The optical fiber switch communicates with the third terminal device via optical fiber.

8. The horizontal transport ad hoc network wireless communication system in a shield operation scenario according to claim 1, characterized in that: The optical fiber switch communicates with the ground control center via optical fiber.

9. The horizontal transport ad hoc network wireless communication system in a shield operation scenario according to claim 2, characterized in that: Intercom equipment is installed on the first terminal device, the second terminal device and the third terminal device.

10. A wireless communication method for horizontal transport ad hoc network in shield operation scenario, characterized in that: Using the horizontal transport ad hoc network wireless communication system in a shield operation scenario as described in claim 3, the method includes: Real-time monitoring of the extension of each communication link between any two of the ground control center, the optical fiber switch, the relay device, the first terminal device, the second terminal device and the third terminal device; When any two of the ground control center, the optical fiber switch, the relay device, the first terminal device, the second terminal device and the third terminal device communicate with each other, the communication link with the lowest delay between the two devices is used for communication.

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