A method and system for business communication of a vehicle cross-line operation

Abstract

The application provides a vehicle cross-line operation service communication method and system, and relates to the technical field of urban rail transit. If it is detected that a target vehicle is in a network transition area of two lines in a cross-line operation scenario, a target wireless communication system supported in a corresponding range of a target station on a target line and network monitoring data under the target wireless communication system are obtained. If the network monitoring data meets a preset switching condition, switching of a current communication system to the target wireless communication system is triggered, so as to switch a connection between a vehicle-mounted device on the target vehicle and a vehicle-mounted wireless device of the current communication system to a connection between the vehicle-mounted device and a vehicle-mounted wireless device of the target wireless communication system. The vehicle-mounted wireless device of the target wireless communication system is used to transmit vehicle-ground interaction service data associated with the vehicle-mounted device. Thus, the target vehicle has multi-system communication capability, the communication system switching accuracy is improved, and the timely and stable transmission of service data is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of urban rail transit, in particular to a service communication method and system for vehicle cross-line operation. BACKGROUND

[0002] The urban rail transit communication system is an important basis for train operation, system bearing, dispatch voice communication, passenger information service and line network operation, and is also the key to realize cross-line operation reconstruction. The communication system is composed of transmission, wireless, public telephone, closed-circuit television, special telephone (including dispatch telephone and centralized telephone), broadcast, clock and other subsystems, forming a comprehensive service communication network for transmitting voice, text, data, image and other information. If a unified line network communication system is adopted for reconstruction, there are problems of high short-term investment cost and great coordination difficulty, and the communication bearing network is generally reconstructed synchronously with the signal system, and the construction period often needs decades, which cannot meet the demand of cross-line operation. Therefore, the communication system of different systems is commonly used.

[0003] Under the condition of cross-line operation, the primary task of the communication system of different systems is to meet the demand of train-ground data interaction service. Compared with the communication system of the same system, the communication capacity and communication protocol of the communication system of different systems on different lines are not the same, and the ground control center is independently deployed to realize reliable train cross-line switching and guarantee the operation quality and continuity of the service. The existing train does not have the communication capacity of multiple systems, and there is also a lack of corresponding interaction mechanism between the ground control centers. When the train leaves the current service line or the network communication is unstable, the train will be downgraded and emergency braking due to the failure to successfully access the target line or the failure of the device to restart, and even cause a train accident. On the other hand, the communication resources of different lines are different, and the instability of air communication caused by the fast movement of the train is further magnified. If the ground control center cannot adapt to the resource scheduling under the condition of train cross-line driving in or driving out, the service quality of the service system will be reduced or even interrupted, and the linkage triggering cannot be realized. Therefore, it is an urgent problem to realize wireless communication in the cross-line operation scene under the communication system of different systems. SUMMARY

[0004] The present application provides a service communication method and system for vehicle cross-line operation to solve the problems of unstable cross-line operation communication network and wireless communication system switching in the prior art.

[0005] To achieve the above object, the technical scheme adopted by the embodiments of the present application is as follows:

[0006] In a first aspect, the embodiments of the present application provide a service communication method for vehicle cross-line operation, applied to a vehicle-mounted control device in a service communication system for track traffic vehicle cross-line operation, and the method comprises:

[0007] if it is detected that the target vehicle is in a network transition area of two lines in a cross-line operation scenario, obtaining a target wireless communication mode supported in a range corresponding to a target station on a target line and network monitoring data in the target wireless communication mode; wherein the target line is a line closest to the target vehicle in a train travel direction of the target vehicle among the two lines;

[0008] if the network monitoring data meets a preset switching condition, triggering switching of a current communication mode to the target wireless communication mode, so as to switch a connection between a vehicle-mounted device on the target vehicle and a vehicle-mounted wireless device of the current communication mode to a connection between the vehicle-mounted device and a vehicle-mounted wireless device of the target wireless communication mode;

[0009] transmitting, by the vehicle-mounted wireless device using the target wireless communication mode, train-ground interaction service data associated with the vehicle-mounted device.

[0010] Optionally, before the if the network monitoring data meets a preset switching condition, triggering switching of a current communication mode to the target wireless communication mode, the method further comprises:

[0011] calculating a first predicted communication time of the target vehicle in the network transition area according to a travel state parameter of the target vehicle;

[0012] the if the network monitoring data meets a preset switching condition, triggering switching of a current communication mode to the target wireless communication mode, comprises:

[0013] if the first predicted communication time is greater than or equal to a preset network switching time and the network monitoring data meets a preset switching condition, triggering switching of a current communication mode to the target wireless communication mode.

[0014] Optionally, after the calculating a first predicted communication time of the target vehicle in the network transition area according to a travel state parameter of the target vehicle, the method comprises:

[0015] if the first predicted communication time is less than the preset network switching time, controlling the target vehicle to adjust a travel state;

[0016] recomputing a predicted communication time of the target vehicle in the network transition area according to an adjusted travel state parameter until a second predicted communication time re-computed is greater than or equal to the preset network switching time.

[0017] Optionally, after the if the first predicted communication time is less than the preset network switching time, controlling the target vehicle to adjust a travel state, the method further comprises:

[0018] if the adjusted travel state parameter reaches a preset maximum acceleration parameter and the second predicted communication time is still less than the preset network switching time, controlling a plurality of preset communication service ports of a wireless communication device connected by base station equipment on the two lines to reduce the occupation of network bandwidth to increase the network transition area;

[0019] According to the preset maximum acceleration parameter, the third predicted communication time of the target vehicle in the increased network transition area is continuously dynamically calculated until the third predicted communication time is greater than or equal to the preset network switching time.

[0020] Optionally, before the target wireless communication mode supported in the range corresponding to the target station on the target line and the network monitoring data in the target wireless communication mode are obtained, the method further comprises:

[0021] According to the power parameters of the link access components on each line of the two lines, the network transition area is calculated.

[0022] Optionally, before the network transition area is calculated according to the power parameters of the link access components on each line of the two lines, the method further comprises:

[0023] Obtain a plurality of access schemes of the coverage link between the stations of the lines and the base stations in the corresponding communication mode;

[0024] Obtain the link access network loss of the lines under the plurality of access schemes;

[0025] According to the link access network loss under the plurality of access schemes, determine a target access scheme that meets a preset communication resource optimization condition from the plurality of access schemes, so as to access the ground-to-vehicle wireless device of the lines in the corresponding communication mode to the base station in the corresponding communication mode by using the target access scheme.

[0026] Optionally, the method further comprises:

[0027] Monitoring network monitoring data in the wireless communication mode supported in the range corresponding to each adjacent station of the cross-line connection;

[0028] If the network monitoring data does not meet the preset switching condition, network warning information is reported.

[0029] Optionally, the vehicle-mounted control device comprises a head device and a tail device, and if the network monitoring data meets the preset switching condition, the switching from the current communication mode to the target wireless communication mode is triggered.

[0030] if the network monitoring data meets preset switching conditions and the head device is in the network transition area, triggering switching of the current communication mode of the head device to the target wireless communication mode;

[0031] if the network monitoring data meets preset switching conditions and the tail device is in the network transition area, triggering switching of the current communication mode of the tail device to the target wireless communication mode.

[0032] Optionally, if the network monitoring data meets preset switching conditions, triggering switching of the current communication mode to the target wireless communication mode further comprises:

[0033] if the head device switches successfully and the tail device switches successfully, reporting that the head and tail switching is successful;

[0034] if the head device switches successfully and the tail device fails to switch, taking the head device as the main control device of the target vehicle and reporting that the tail switching fails.

[0035] if the head device fails to switch and the tail device switches successfully, taking the tail device as the main control device of the target vehicle and reporting that the head switching fails;

[0036] if the head device fails to switch and the tail device fails to switch, controlling the target vehicle to enter a preset emergency state and reporting that the head and tail switching fails.

[0037] In a second aspect, the embodiments of the present application provide a service communication system for track traffic vehicle cross-line operation, which comprises a ground monitoring device and a vehicle-mounted control device, the ground monitoring device is in communication connection with the vehicle-mounted control device, the vehicle-mounted control device is configured to execute the steps of the service communication method for vehicle cross-line operation according to any one of the first aspect, the vehicle-mounted control device is arranged on a target vehicle, the ground monitoring device is configured to monitor a network switching process of the target vehicle and download an operation result of the vehicle-mounted control device.

[0038] Compared with the prior art, the present application has the following beneficial effects:

[0039] The application provides a service communication method and system for vehicle cross-line operation. If it is detected that a target vehicle is in a network transition area of two lines in a cross-line operation scenario, a target wireless communication mode supported in a range corresponding to a target station on a target line and network monitoring data in the target wireless communication mode are acquired; the target line is a line closest to the target vehicle in a train travel direction of the target vehicle among the two lines; if the network monitoring data meets a preset switching condition, switching of a current communication mode to the target wireless communication mode is triggered, so that connection between a vehicle-mounted device on the target vehicle and a vehicle-mounted wireless device of the current communication mode is switched to connection between the vehicle-mounted device and a vehicle-mounted wireless device of the target wireless communication mode; and the vehicle-mounted wireless device of the target wireless communication mode is used to transmit train-ground interaction service data associated with the vehicle-mounted device. Thus, the target vehicle has multi-mode communication capability, the communication mode switching accuracy is improved, train operation problems caused by unstable communication network or improper timing during cross-line operation communication are avoided, and service data is ensured to be transmitted in a timely and stable manner. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 A flowchart of a service communication method for vehicle cross-line operation provided by the embodiment of the application;

[0042] Figure 2A A schematic diagram of a network transition area provided by the embodiment of the application;

[0043] Figure 2B A schematic diagram of network transition area switching provided by the embodiment of the application;

[0044] Figure 3 A flowchart of a service communication judgment method provided by the embodiment of the application;

[0045] Figure 4 A flowchart of another service communication judgment method provided by the embodiment of the application;

[0046] Figure 5 A flowchart of still another service communication judgment method provided by the embodiment of the application;

[0047] Figure 6 A flowchart of a method for determining a target access scheme provided by the embodiment of the application;

[0048] Figure 7 A flowchart of a network data monitoring method provided by an embodiment of the present application is shown in FIG. 1.

[0049] Figure 8 A schematic diagram of a service communication device for track traffic vehicle cross-line operation provided by an embodiment of the present application is shown in FIG. 2.

[0050] Figure 9 A schematic diagram of a ground monitoring device provided by an embodiment of the present application is shown in FIG. 3.

[0051] Icon: 701 - acquisition module, 702 - switching module, 703 - transmission module, 801 - processor, 802 - storage medium. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0053] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0054] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0055] In addition, if the terms "first", "second", etc. are used, they are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0056] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0057] The service communication system to which the service communication method for vehicle cross-line operation provided by the present application is applied will be explained first through specific embodiments as follows.

[0058] The business communication system comprises a ground monitoring device and a vehicle-mounted control device, the ground monitoring device is in communication connection with the vehicle-mounted control device, the vehicle-mounted control device is configured to execute the method steps of any of the embodiments of the present application, the vehicle-mounted control device is arranged on a target vehicle, and the ground monitoring device is configured to monitor state data of the target vehicle switching a network and download running results of the vehicle-mounted control device.

[0059] For example, the vehicle cross-line running business communication method provided in the present application can be executed by the vehicle-mounted control device.

[0060] For example, the ground monitoring device can control the on / off of the vehicle-mounted control device, monitor state data of the vehicle entering a network during a switching process, monitor the whole switching process, receive prompt information generated when a switching trigger condition is reached, receive feedback information after a user operation agrees to switching and executes a switching operation, and perform functions such as log backup during system running.

[0061] In another embodiment, the vehicle-mounted control device comprises a front-end device and a tail-end device, the front-end device is arranged at the front end of the target vehicle, and the tail-end device is arranged at the tail end of the target vehicle.

[0062] The vehicle cross-line running business communication method provided in the present application is explained and described below through specific embodiments. Figure 1 A flowchart of the vehicle cross-line running business communication method provided in the embodiments of the present application is shown in FIG. 1. The execution subject of the method is a ground monitoring device, which is a device with computing and processing capabilities. As shown in FIG. 1, the method comprises the following steps. Figure 1

[0063] S101, if it is detected that the target vehicle is in a network transition area of two lines in a cross-line running scenario, obtaining a target wireless communication standard supported in a range corresponding to a target station on a target line and network monitoring data in the target wireless communication standard.

[0064] The target line is the line closest to the target vehicle in the train running direction of the target vehicle among the two lines. The network transition area of the two lines in the cross-line running scenario is an overlapping area of the communication standard network coverage ranges of two adjacent base station devices. In the network transition area, the reliability of the two communication standard networks is required to be high to ensure stable switching.

[0065] For example, Figure 2A A schematic diagram of the network transition area provided in the embodiments of the present application is shown in FIG. 2. The signals of base station A and base station B are superimposed in the overlapping area, and the reliability of the two communication standard networks is high. When the target vehicle travels into the area, it is suitable for communication standard switching.

[0066] ​The target vehicle travels along a target line from a previous station to a next station, and the next station to be reached is the target station. In order to facilitate switching to the target wireless communication mode supported in the range corresponding to the target station, the communication network state between the target vehicle and the base station device is detected in real time. Not only the network monitoring data of the current station, but also the network monitoring data of the target station is monitored. If the target vehicle is in the network transition area of the two lines in the cross-line running scenario, the network monitoring data of the target station can be monitored, the target wireless communication mode supported in the range corresponding to the target station on the target line and the network monitoring data under the target wireless communication mode are obtained, and preparation is made for wireless communication mode switching.

[0067] The network monitoring data includes field strength (received signal strength RSSI), network connectivity (delay, packet loss rate), and bandwidth.

[0068] For example, Figure 2B A schematic diagram of network transition area switching is provided for the embodiments of the present application.

[0069] S102, if the network monitoring data meets the preset switching condition, triggering switching from the current communication mode to the target wireless communication mode, so as to switch the connection between the on-board device of the target vehicle and the on-board wireless device of the current communication mode to the connection between the on-board device and the on-board wireless device of the target wireless communication mode.

[0070] The network monitoring data is defined as a triple, Each type is an array, where F represents the field strength, i.e. The field strength sequence continuously monitored in the connection interval of the train running or stopping; C represents the network connectivity, i.e. Where D represents the monitored delay value sequence, P represents the monitored packet loss rate sequence; B represents the bandwidth, Where W represents the monitored underground bandwidth value, The uplink transmission rate of the i-th monitoring of underground running, The downlink transmission rate of the j-th monitoring of underground running. G represents the ground bandwidth value monitored during the whole switching process, The uplink transmission rate of the i-th monitoring of the ground running section, The downlink transmission rate of the j-th monitoring of the ground running section.

[0071] For example, the preset switching condition is that the field strength, delay, packet loss rate and bandwidth are all greater than the corresponding preset minimum threshold.

[0072] At the same time, when it is judged that the network monitoring data meets the preset switching condition, the network monitoring data must meet the preset switching condition for a preset time length to ensure network stability.

[0073] For example, the automatic switching from the current wireless communication mode to the target wireless communication mode can be implemented. A "switchable" prompt signal can also be reported to enable the staff to manually switch according to the prompt signal. Specifically, the switching is performed by using the on-board control device.

[0074] S103, the on-board wireless device in the target wireless communication mode transmits the train-ground interactive service data associated with the on-board device.

[0075] After the switching succeeds, the on-board wireless device in the target wireless communication mode transmits the train-ground interactive service data associated with the on-board device, so that the train-ground interactive service data transmission is stable enough.

[0076] For example, the train-ground interactive service data includes train control service data, group dispatch service data, train operation status information, emergency information text, video monitoring data, passenger information system (PIS) streaming service data, and group dispatch service data.

[0077] Thus, the target vehicle has the multi-mode communication capability, the communication mode switching accuracy is improved, train operation problems caused by unstable communication network are avoided, and the service data is transmitted in a timely and stable manner.

[0078] In summary, in the embodiment, if it is detected that the target vehicle is in the network transition area of the two lines in the cross-line running scenario, the target wireless communication mode supported in the range corresponding to the target station on the target line and the network monitoring data in the target wireless communication mode are obtained; the target line is the line closest to the target vehicle in the train running direction of the target vehicle among the two lines; if the network monitoring data meets the preset switching condition, the switching from the current communication mode to the target wireless communication mode is triggered, the connection between the on-board device and the on-board wireless device in the current communication mode on the target vehicle is switched to the connection between the on-board device and the on-board wireless device in the target wireless communication mode; and the on-board wireless device in the target wireless communication mode transmits the train-ground interactive service data associated with the on-board device. Thus, the target vehicle has the multi-mode communication capability, the communication mode switching accuracy is improved, train operation problems caused by unstable communication network or improper timing are avoided, and the service data is transmitted in a timely and stable manner.

[0079] In the above Figure 1 Based on the corresponding embodiment, the application further provides a service communication judgment method. Figure 3 A flowchart of a service communication judgment method provided by the embodiment of the application is shown in Figure 3As shown, before the triggering of the switching from the current communication mode to the target wireless communication mode in S102 if the network monitoring data meets the preset switching condition, the method further comprises:

[0080] S201, calculating a first predicted communication time of the target vehicle in the network transition area according to the travel state parameter of the target vehicle.

[0081] For example, the travel state parameter includes a travel speed and an operation mode, and the operation mode includes at least one of an acceleration mode and a deceleration mode. The travel distance of the target vehicle in the network transition area is determined according to the intersection of the target line where the target vehicle is located and the network transition area. The travel time is calculated according to the travel distance, the travel speed, and the travel acceleration of the operation mode. The travel time is determined as the first predicted communication time.

[0082] For example, in order to facilitate accurate switching, a time design margin is added to the travel time to obtain the first predicted communication time.

[0083] Further, the triggering of the switching from the current communication mode to the target wireless communication mode in S102 includes:

[0084] S202, the first predicted communication time is greater than or equal to a preset network switching time, and the network monitoring data meets the preset switching condition, triggering the switching from the current communication mode to the target wireless communication mode.

[0085] The preset network switching time is the minimum time for completing the network switching. If it is less than the preset network switching time, the network switching cannot be completed in the network transition area. If the first predicted communication time is greater than or equal to the preset network switching time, it indicates that the network switching can be completed in time.

[0086] In summary, in the embodiment, the first predicted communication time of the target vehicle in the network transition area is calculated according to the travel state parameter of the target vehicle. The first predicted communication time is greater than or equal to the preset network switching time, and the network monitoring data meets the preset switching condition, triggering the switching from the current communication mode to the target wireless communication mode. Therefore, the switching accuracy is improved by judging the switching time, and the network stability is improved.

[0087] In the above Figure 3 Based on the corresponding embodiment, the embodiment of the application further provides another service communication judgment method. Figure 4 The flowchart of another service communication judgment method provided by the embodiment of the application is as follows: Figure 4According to the traveling state parameter of the target vehicle, the first predicted communication time of the target vehicle in the network transition area is calculated in S201, and the method further comprises:

[0088] S301, if the first predicted communication time is less than the preset network switching time, the traveling state of the target vehicle is controlled to be adjusted.

[0089] If the first predicted communication time is less than the preset network switching time, the network switching cannot be completed in the network transition area. Therefore, the traveling state of the target vehicle is controlled to be adjusted, and the adjusted traveling state parameter is obtained. For example, the traveling state is adjusted by reducing the traveling speed.

[0090] S302, according to the adjusted traveling state parameter, the predicted communication time of the target vehicle in the network transition area is recalculated until the second predicted communication time recalculated is greater than or equal to the preset network switching time.

[0091] The specific calculation method and beneficial effects are similar to those of the above-mentioned embodiments, and a more detailed calculation method is explained and described here.

[0092] For example, in order to complete stable and reliable network switching in the network transition area, the value of reducing the speed of the target vehicle needs to be calculated before actual switching. The design speed of the vehicle running of the rail transit line is generally 80 km / h, and the design speed of a small number of lines reaches 120 km / h or 160 km / h. The network transition area is generally selected when the speed of the target vehicle is less than or equal to 80 km / h, that is, the speed range of the target vehicle where the switching action occurs is , wherein represents the speed of the target vehicle on the way when the network is switched, represents the network switching unit (specifically the target vehicle or the vehicle-mounted control device on the target vehicle), . The preset network switching time is defined as , and the distance for completing the network switching process is . The length of the network transition area that can be switched when the network monitoring reaches the network switching condition is , which represents the distance that can be used for network switching transition area at the th measurement, should satisfy . The objective function is defined as , that is, in order to ensure the success of network switching, it is necessary to be large enough, to be small enough.

[0093] In this embodiment, the reduction of is taken as an example for explanation and description. is a constant value, then needs to be reduced, so that The value of the first predicted communication time is obtained by interpolation. The value of the first predicted communication time is obtained by interpolation. The first priority is given to the first gear. The second gear. The conditions are determined by trial and error in two intervals. The conditions are determined by trial and error in two intervals. The first predicted communication time is less than the preset network switching time. The first predicted communication time is less than the preset network switching time. The first predicted communication time is less than the preset network switching time. The first predicted communication time is less than the preset network switching time.

[0094] In the embodiment, if the first predicted communication time is less than the preset network switching time, the target vehicle adjusts the running state; according to the adjusted running state parameter, the target vehicle recalculates the predicted communication time in the network transition area until the second predicted communication time is greater than or equal to the preset network switching time. Thus, by judging the switching time, the switching accuracy is improved, and the network stability is improved.

[0095] Based on the above-mentioned Figure 4 corresponding embodiment, the application also provides another business communication judgment method. Figure 5 Another business communication judgment method provided by the embodiment of the application is shown in the flowchart as Figure 5 If the target vehicle is detected in the network transition area of the two lines in the cross-line running scenario in S101, the supported target wireless communication system and the network monitoring data in the target wireless communication system in the corresponding range of the target station on the target line are obtained, and further include:

[0096] S401, if the adjusted running state parameter reaches the preset maximum speed parameter, and the second predicted communication time is still less than the preset network switching time, the wireless communication device connected by the base station equipment on the two lines is controlled to bear a plurality of preset communication business ports to reduce the occupation of network bandwidth and increase the network transition area.

[0097] For example, the preset maximum speed parameter is the maximum acceleration / deceleration of the target vehicle. For example, the maximum deceleration is 1.2 m / s 2 If the speed of the target vehicle fluctuates rapidly and the deceleration exceeds 1.2 m / s 2If the speed of the vehicle is reduced too fast in a short time, the experience of the passengers will be affected, and the running state cannot be adjusted (the speed cannot be reduced) any more. The multiple preset communication service ports carried by the wireless communication device connected to the base station device need to be closed to reduce the occupation of network bandwidth, expand the signal coverage range, improve the signal quality, and increase the network transition area. Conversely, the multiple preset communication service ports carried by the wireless communication device connected to the base station device can be opened to ensure normal communication.

[0098] For example, according to the importance difference of the transmitted information content and the influence size on the train operation and the normal operation order, the priority of the QoS mapping of each carried business system can be configured. When the target vehicle approaches or reaches the network transition area, but the network transmission resource is not good (the network monitoring data does not meet the preset switching condition). The communication resource of the information with low level can be limited (the communication link of the information is reduced / closed) according to the priority, so as to guarantee the normal switching of the core business type, and the resource of the information is adjusted to increase when the communication state is good. For example, the important information is guaranteed in priority through the control of the interface channel. Table 1 below shows the priority of each business type.

[0099]

[0100] Table 1

[0101] S402, according to the preset maximum speed change parameter, continuously and dynamically calculate the third expected communication time of the target vehicle in the enlarged network transition area, until the third expected communication time is greater than or equal to the preset network switching time.

[0102] For example, the actual switching distance in the enlarged network transition area is increased, that is, the is increased, and the is also increased, so that the condition is met: is met. The target vehicle in motion travels according to the calculated , and the calculated is large enough to ensure the success of network switching.

[0103] The specific calculation method and beneficial effects are similar to those of the above-mentioned embodiments, which will not be repeated here.

[0104] In summary, in the embodiment, if the adjusted travel state parameter reaches the preset maximum variable parameter, and the second predicted communication time is still less than the preset network switching time, the wireless communication device carrying a plurality of preset communication service ports connected by the base station equipment on the two lines is controlled to reduce the occupation of the network bandwidth to increase the network transition area; according to the preset maximum variable parameter, the third predicted communication time of the target vehicle in the increased network transition area is continuously and dynamically calculated until the third predicted communication time is greater than or equal to the preset network switching time. Thus, the switching accuracy is improved by judging the switching time, and the network stability is improved.

[0105] In the above Figure 1 Based on the corresponding embodiment, in another embodiment of the present application, if it is detected in S101 that the target vehicle is in the network transition area of the two lines in the cross-line running scenario, before the supported target wireless communication mode in the target station corresponding range on the target line and the network monitoring data under the target wireless communication mode are obtained, the method further comprises:

[0106] According to the power parameters of the link access components on each link of each line of the two lines, the network transition area is calculated.

[0107] For example, the greater the power of the base station equipment, the larger the corresponding network coverage range. The power parameters of the link access components are used to represent the power of the base station equipment, and the corresponding network coverage range is calculated. According to the overlapping area of the network coverage ranges of the two base station equipments, the network transition area is obtained. It should be noted that the two communication mode networks in the network transition area should be stable enough (the network parameters are greater than or equal to the preset minimum network parameters) to realize stable communication using both communication mode networks.

[0108] For example, the link access component generally includes a coupler, a power divider, a 7 / 8 feeder, a 1 / 2 feeder, etc. The power divider, which is a full name of power divider, is a device that divides the energy of one input signal into two or more output signals with equal or unequal energy. The coupler is a device that divides one signal into two signals with unequal energy. It generally has three terminals, which are input, straight-through and coupling terminals. The amount of loss of wireless signals passing through the above passive devices and feeders determines the size of the network coverage range.

[0109] In summary, in the embodiment, according to the power parameters of the link access components on each link of each line of the two lines, the network transition area is calculated. Thus, the network transition area is accurately determined.

[0110] Based on the above embodiment, the present application further provides a method for determining a target access scheme. Figure 6 A flowchart of a method for determining a target access scheme provided by an embodiment of the present application is shown in Figure 6As shown, according to the power parameters of the link access components on each link in the two lines, before the network transition area is calculated, the method further comprises:

[0111] S501, obtaining a plurality of access schemes of the coverage link between the station of each line and the base station under the corresponding communication mode.

[0112] Each access scheme contains the number and access position of each type of link access component.

[0113] S502, obtaining the link access network loss of each line under the plurality of access schemes.

[0114] S503, determining the target access scheme that meets the preset optimal communication resource condition according to the link access network loss under the plurality of access schemes, so as to adopt the target access scheme to access the train-ground wireless device under the corresponding communication mode to the base station under the corresponding communication mode.

[0115] For example, the preset optimal communication resource condition is the minimum link access network loss, that is, the access scheme with the minimum link access network resource occupation loss is determined as the target access scheme. Alternatively, the preset optimal communication resource condition is the minimum link access network loss under the premise of ensuring stable and reliable transmission performance.

[0116] In summary, in this embodiment, a plurality of access schemes of the coverage link between the station of each line and the base station under the corresponding communication mode are obtained; the link access network loss of each line under the plurality of access schemes is obtained; and the target access scheme that meets the preset optimal communication resource condition is determined from the plurality of access schemes according to the link access network loss under the plurality of access schemes, so as to adopt the target access scheme to access the train-ground wireless device under the corresponding communication mode to the base station under the corresponding communication mode. Thus, the target access scheme is accurately determined by the link access network loss.

[0117] For example, if the communication mode is Tetra mode, the number of each access component in the link access and the predicted access power consumption data of each type of link access component are obtained. According to the number of each link access component and the predicted access power consumption data of each access component, the link access network loss of each access scheme is calculated.

[0118] P is defined as the attenuation value of the communication performance after the output of the base station transmitter is accessed by the element, represents the unit loss value of the jth type of device after the output of the base station transmitter, represents the number of the jth type of device, represents the total power loss amount of the jth type of device. represents the unit loss value of the kth type of device after entering the leaky cable transmission link range, represents the number of the kth type of device, represents the total amount of power loss of accessing the kth type of device; the link access network loss value after the ith link section accesses the device component is represented as P(i)= - , wherein, is the initial output power.

[0119] If , the j+kth access device is the critical value of the accessible occupied communication resource. Therefore, according to the actual laying length of the communication transmission line of the rail transit line section, when the length is certain, the objective function of the optimal communication resource in the transmission process is represented as Z= Min(P(i)) AND Max(j+k) , and the optimal objective function is the preset optimal condition of the communication resource.

[0120] For example, if the communication system is the LTE system.

[0121] The point spacing of the radio remote unit under the plurality of access schemes is calculated according to the link access network loss and the cable loss under the plurality of access schemes.

[0122] , wherein the point spacing of the radio remote unit (RRU) is (cell radius x 2-100) x (1+∆), wherein ∆ represents a preset reserved amount, considering the leakage cable loss margin. For example, ∆=10%.

[0123] , wherein the cell radius is (link access network loss-leakage cable coupling loss) / leakage cable loss per 100 m x 100.

[0124] , wherein the link access network loss is the equivalent omnidirectional transmission power per subcarrier-minimum signal receiving level-penetration loss-slow fading margin-engineering margin. The penetration loss, the slow fading margin, and the engineering margin are set in advance according to actual needs.

[0125] , wherein the equivalent omnidirectional transmission power per subcarrier is the subcarrier transmission power+transmission end antenna gain-transmission end feeder loss-transmission end combining loss.

[0126] , wherein the minimum signal receiving level is the receiver sensitivity-receiving end antenna gain-receiving end feeder loss+receiving end combining loss+interference margin. The receiver sensitivity is the thermal noise in the preset bandwidth+10*LOG10(15000)+demodulation threshold+receiving end noise coefficient. The receiving end antenna gain, the receiving end feeder loss, the receiving end combining loss, and the interference margin are set in advance according to actual needs.

[0127] The target access scheme that meets the preset optimal condition of the communication resource is determined from the plurality of access schemes according to the point spacing of the radio remote unit under the plurality of access schemes.

[0128] For example, the preset communication resource optimal condition is that the spacing between the distributed remote radio units is maximum, that is, the access scheme with the maximum spacing between the distributed remote radio units is determined as the target access scheme.

[0129] In the above Figure 1 Based on the corresponding embodiments, the present application further provides a network data monitoring method. Figure 7 A flowchart of a network data monitoring method provided by the present application is shown in Figure 7 The method further includes:

[0130] S601, monitoring network monitoring data in a wireless communication system supported by each adjacent station corresponding to the cross-line connection.

[0131] S602, if the network monitoring data does not meet the preset switching condition, reporting a network warning information.

[0132] By monitoring the physical link of data transmission, when various network parameters change (the network monitoring data does not meet the preset switching condition), the network warning information is discovered and reported in a timely manner, thereby ensuring the reliability of the train-ground communication. For example, the indicators of the RRU optical link and the physical link of the wireless coverage are monitored.

[0133] In the above Figure 1 Based on the corresponding embodiments, in another embodiment of the present application, the on-board control device includes a head device and a tail device, and if the network monitoring data meets the preset switching condition in S102, the switching from the current communication system to the target wireless communication system is triggered, including:

[0134] If the network monitoring data meets the preset switching condition and the head device is in the network transition area, the switching from the current communication system to the target wireless communication system of the head device is triggered.

[0135] If the network monitoring data meets the preset switching condition and the tail device is in the network transition area, the switching from the current communication system to the target wireless communication system of the tail device is triggered.

[0136] For example, if the target vehicle is a long-formation train, the on-board control devices are on the head and the tail, which are the head device and the tail device, respectively. The head enters the network transition area before the tail, and therefore, the head and the tail complete the switching to the target wireless communication system in sequence.

[0137] In the above Figure 1 Based on the corresponding embodiments, in another embodiment of the present application, if the network monitoring data meets the preset switching condition in S102, the switching from the current communication system to the target wireless communication system is triggered, and further includes:

[0138] If the front device is switched successfully and the rear device is switched successfully, the front and rear device switching success will be reported.

[0139] When both the front and rear sides of the vehicle are switched successfully in the network transition area, the front device and the rear device both send a report of successful switching to the ground monitoring device.

[0140] If the front device switches successfully and the rear device switches unsuccessfully, the front device will be used as the main control device for the target vehicle and the rear device switching failure will be reported.

[0141] When the front device switches successfully and the rear device switches unsuccessfully, the front device will be used as the main control device for the target vehicle, and the rear device will enter a fault failure state. When the system is not deadlocked, it will continue to reconnect in an attempt to complete the switch, and at the same time send a report to the ground monitoring device indicating that the front device switches successfully and the rear device switches unsuccessfully.

[0142] If the front device fails to switch, and if the rear device switches successfully, the rear device will be used as the main control device of the target vehicle and the front device switching failure will be reported.

[0143] When the front device fails to switch, the target vehicle maintains its current speed and continues to run until the rear side of the vehicle enters the network transition area for switching. After the switch is successful, the rear device is used as the main control device of the target vehicle, and the rear device sends a report message to the ground monitoring device indicating that the front device switch failed or the rear device switch was successful.

[0144] If the front device switching fails, and if the rear device switching fails, the target vehicle is controlled to enter a preset emergency state and the front and rear device switching failure is reported.

[0145] If both the front and rear devices fail to switch, the vehicle enters a degraded operating mode and reports the failure to switch both the front and rear devices to the ground monitoring device. The ground monitoring device and control personnel then determine whether to initiate an emergency stop based on a pre-set scenario. Pre-set scenarios are pre-set solutions tailored to different scenarios.

[0146] For example, especially when the front and rear of the vehicle are switched separately as mentioned in the above embodiment, there is a short-term state in which the front and rear of the vehicle respectively use different communication standards. The data is continuously monitored to determine whether the front and rear of the vehicle maintain the interaction of communication instructions.

[0147] The following describes a business communication device, equipment, and storage medium for cross-line operation of rail transit vehicles provided by this application. The specific implementation process and technical effects are described above and will not be repeated below.

[0148] Figure 8A schematic diagram of a service communication device for rail transit vehicles running across lines provided in an embodiment of the present application, such as Figure 8 As shown, the device includes:

[0149] Acquisition module 701 is used to obtain the target wireless communication standard supported within the corresponding range of the target station on the target line and the network monitoring data under the target wireless communication standard if it is detected that the target vehicle is in the network transition area of ​​the two lines in the cross-line operation scenario; wherein the target line is the line closest to the target vehicle in the train travel direction of the target vehicle in the two lines.

[0150] The switching module 702 is configured to trigger a switch from the current communication standard to the target wireless communication standard if the network monitoring data satisfies a preset switching condition, thereby switching the connection between the on-board device of the target vehicle and the on-board wireless device of the current communication standard to a connection between the on-board device and the on-board wireless device of the target wireless communication standard.

[0151] The transmission module 703 transmits the service data associated with the vehicle-mounted device using the vehicle-mounted wireless device of the target wireless communication standard.

[0152] Furthermore, the acquisition module 701 is specifically used to calculate the first expected communication time of the target vehicle in the network transition area based on the moving state parameters of the target vehicle; if the first expected communication time is greater than or equal to the preset network switching time, and the network monitoring data meets the preset switching conditions, it triggers the switching of the current communication mode to the target wireless communication mode.

[0153] Furthermore, the acquisition module 701 is specifically used to control the target vehicle to adjust its travel state if the first expected communication time is less than the preset network switching time; and recalculate the expected communication time of the target vehicle in the network transition area according to the adjusted travel state parameters until the recalculated second expected communication time is greater than or equal to the preset network switching time.

[0154] Furthermore, the acquisition module 701 is specifically used to control the base station equipment on the two lines to adjust the signal coverage range to increase the network transition area if the adjusted traveling state parameter reaches the preset maximum speed parameter and the second expected communication time is still less than the preset network switching time; according to the preset maximum speed parameter, continuously and dynamically calculate the third expected communication time of the target vehicle in the increased network transition area until the third expected communication time is greater than or equal to the preset network switching time.

[0155] Furthermore, the acquisition module 701 is further configured to calculate the network transition area according to the power parameters of each link access component on each of the two lines.

[0156] Further, the acquisition module 701 is further configured to acquire a plurality of access schemes of a coverage link between a station of each line and a base station in a corresponding communication mode; acquire link access network loss of each line in the plurality of access schemes; determine a target access scheme when a preset communication resource optimal condition is met from the plurality of access schemes according to the link access network loss in the plurality of access schemes, so as to access the train-ground wireless device in the corresponding communication mode to the base station in the corresponding communication mode by using the target access scheme.

[0157] Further, the acquisition module 701 is further configured to monitor network monitoring data in a wireless communication mode supported in a corresponding range of each adjacent station of the cross-line connection; if the network monitoring data does not meet a preset switching condition, report a network warning information.

[0158] Further, the switching module 702 is further configured to trigger switching of a current communication mode of the head device to a target wireless communication mode if the network monitoring data meets the preset switching condition and the head device is in the network transition area; trigger switching of a current communication mode of the tail device to a target wireless communication mode if the network monitoring data meets the preset switching condition and the tail device is in the network transition area.

[0159] Further, the switching module 702 is further configured to report successful switching of the head and tail if the head device switching is successful and the tail device switching is successful; report that the head device is used as a master control device of the target vehicle and the tail switching fails if the head device switching is successful and the tail device switching fails; report that the tail device is used as a master control device of the target vehicle and the head switching fails if the head device switching fails and the tail device switching is successful; control the target vehicle to enter a preset emergency state and report that the head and tail switching fails if the head device switching fails and the tail device switching fails.

[0160] Figure 9 A schematic diagram of a vehicle-mounted control device provided by an embodiment of the present application is shown in FIG. 8. The device can be a device or a server with computing processing function. As shown in FIG. 8, the device includes a processor 801 and a storage medium 802. Figure 9

[0161] The processor 801 and the storage medium 802 are connected through a bus.

[0162] The storage medium 802 is configured to store a program, and the processor 801 invokes the program stored in the storage medium 802 to execute the above-mentioned method embodiments. The specific implementation manners and technical effects are similar, and will not be described here.

[0163] Optionally, the present application further provides a program product, for example, a computer readable storage medium, including a program, which is used to execute the above-mentioned method embodiments when executed by a processor.​

[0164] In several embodiments provided by the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. For example, the described apparatus embodiments are merely schematic. The division of the units is merely a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0165] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0166] In addition, each functional unit in the various embodiments of the present application can be integrated in one processing unit, or each unit can be a physically independent unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of hardware plus software functional units.

[0167] The integrated unit implemented in the form of software functional units can be stored in a computer readable storage medium. The software functional units stored in the storage medium include a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the method described in the various embodiments of the present application. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviated as: ROM), a random access memory (English: Random Access Memory, abbreviated as: RAM), a magnetic disk or an optical disk, and various media that can store program codes.

Claims

1. A vehicle cross-line operation business communication method, applied to the vehicle-mounted control equipment in the rail transit vehicle cross-line operation business communication system, characterized in that: The method comprises: If the target vehicle is detected to be in the network transition area of ​​two lines in the cross-line operation scenario, the target wireless communication standard supported within the corresponding range of the target station on the target line and the network monitoring data under the target wireless communication standard are obtained; wherein the target line is the line closest to the target vehicle in the train travel direction of the target vehicle of the two lines; If the network monitoring data satisfies a preset switching condition, triggering a switch from the current communication standard to the target wireless communication standard, so as to switch the connection between the on-board device of the target vehicle and the on-board wireless device of the current communication standard to a connection between the on-board device and the on-board wireless device of the target wireless communication standard; Using the on-vehicle wireless device of the target wireless communication standard to transmit vehicle-ground interaction service data associated with the on-vehicle device; Before triggering the switching of the current communication standard to the target wireless communication standard if the network monitoring data satisfies the preset switching condition, the method further includes: Calculating a first estimated communication time of the target vehicle within the network transition area according to the traveling state parameter of the target vehicle; If the network monitoring data satisfies a preset switching condition, triggering the switching of the current communication standard to the target wireless communication standard includes: If the first estimated communication time is greater than or equal to the preset network switching time, and the network monitoring data meets the preset switching condition, triggering the switching of the current communication standard to the target wireless communication standard; After calculating a first expected communication time of the target vehicle within the network transition area based on the traveling state parameter of the target vehicle, the method further includes: If the first estimated communication time is less than the preset network switching time, controlling the target vehicle to adjust the traveling state; recalculating a second estimated communication time of the target vehicle in the network transition area according to the adjusted traveling state parameter until the recalculated second estimated communication time is greater than or equal to the preset network switching time; After controlling the target vehicle to adjust its traveling state if the first estimated communication time is less than the preset network switching time, the method further includes: If the adjusted travel state parameter reaches a preset maximum speed change parameter and the second estimated communication time is still less than the preset network switching time, controlling a plurality of preset communication service ports carried by wireless communication devices connected to the base station devices on the two lines to reduce network bandwidth usage and thereby increase the network transition area; The third estimated communication time of the target vehicle in the increased network transition area is continuously and dynamically calculated according to the preset maximum speed change parameter until the third estimated communication time is greater than or equal to the preset network switching time.

2. The method according to claim 1, characterized in that If it is detected that the target vehicle is in the network transition area of ​​two lines in the cross-line operation scenario, before obtaining the target wireless communication standard supported within the corresponding range of the target station on the target line and the network monitoring data under the target wireless communication standard, the method further includes: The network transition area is calculated according to the power parameters of each link access component on each of the two lines.

3. The method according to claim 2, characterized in that Before calculating the network transition area based on the power parameters of each link access component on each of the two lines, the method further includes: Acquire multiple access schemes for coverage links between sites of each line and base stations under corresponding communication standards; Obtaining link access network losses of each line under the multiple access schemes; According to the link access network loss under the multiple access schemes, a target access scheme that meets the preset communication resource optimal conditions is determined from the multiple access schemes, and the target access scheme is adopted to connect the vehicle-ground wireless devices of each line under the corresponding communication standard to the base station under the corresponding communication standard.

4. The method according to claim 1, wherein The method further comprises: Monitor network monitoring data under the wireless communication system supported by each adjacent site connected across the line; If the network monitoring data does not meet the preset switching condition, network warning information is reported.

5. The method according to claim 1, wherein The vehicle-mounted control device includes: a front device and a rear device. If the network monitoring data meets the preset switching condition, triggering the switching of the current communication mode to the target wireless communication mode includes: If the network monitoring data meets the preset switching condition and the vehicle head device is in the network transition area, triggering the switching of the current communication mode of the vehicle head device to the target wireless communication mode; If the network monitoring data meets the preset switching condition and the rear-end device is in the network transition area, the current communication mode of the rear-end device is triggered to switch to the target wireless communication mode.

6. The method according to claim 5, characterized in that If the network monitoring data satisfies a preset switching condition, triggering the switching of the current communication standard to the target wireless communication standard further includes: If the front device is switched successfully, and the rear device is switched successfully, then report the success of the front and rear device switching; If the front device switches successfully and the rear device switches unsuccessfully, the front device is used as the main control device of the target vehicle and the rear device switching failure is reported; If the front device fails to switch, and if the rear device succeeds, the rear device is used as the main control device of the target vehicle and the front device switching failure is reported; If the front device fails to switch, and if the rear device fails to switch, the target vehicle is controlled to enter a preset emergency state, and the failure of the front and rear device switching is reported.

7. A rail transit vehicle cross-line operation business communication system, characterized in that: The business communication system includes: a ground monitoring device and a vehicle-mounted control device. The ground monitoring device is communicatively connected to the vehicle-mounted control device. The vehicle-mounted control device is used to execute the steps of the business communication method for vehicle cross-line operation as described in any one of claims 1 to 6. The vehicle-mounted control device is set on the target vehicle. The ground monitoring device is used to monitor the network switching process of the target vehicle and download the operation results of the vehicle-mounted control device.

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