CN110012514B - Train wireless communication optimization method and system - Google Patents

Train wireless communication optimization method and system Download PDF

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CN110012514B
CN110012514B CN201910248684.XA CN201910248684A CN110012514B CN 110012514 B CN110012514 B CN 110012514B CN 201910248684 A CN201910248684 A CN 201910248684A CN 110012514 B CN110012514 B CN 110012514B
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information
train
access
gis
train line
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CN110012514A (en
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贾利民
高一凡
朱世友
秦勇
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Beijing Jinhong Xi Dian Information Technology Co ltd
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Beijing Jinhong Xi Dian Information Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H04W4/44—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for communication between vehicles and infrastructures, e.g. vehicle-to-cloud [V2C] or vehicle-to-home [V2H]

Abstract

The invention provides a method and a system for optimizing train wireless communication, which are implemented by the following steps: fusing train line information and train running information with a GIS (geographic information system), and visually displaying train lines and train running tracks on a GIS electronic map; acquiring AP position information of a radiation range capable of covering part of lines of a train, and fusing the AP position information with a GIS; mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information; pre-storing the AP attribute information, the AP position information and the AP-route mapping information of the train line into a data storage module; in the running process of the train, the vehicle-mounted wireless unit acquires the associable AP, compares the associable AP with the prestored AP-route mapping information, screens the coincident AP as a pre-access AP, and selects the AP with the highest stability coefficient as an access AP from the pre-access APs. By the method or the system, the risk of leakage or loss of train communication information is greatly reduced, and the stability of communication transmission is improved.

Description

Train wireless communication optimization method and system
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a train wireless communication optimization method and system.
Background
The speed of the train in China is increased, and the requirements on the safety and reliability of an automatic train control system are gradually increased. In recent years, with the rapid increase of the number of Access Points (APs), the low price, and the convenience and high efficiency of Wireless networks, Wi-Fi (Wireless Fidelity) has rapidly spread. Wi-Fi will be increasingly more wireless. Wi-Fi is used for the transmission means of automatic train control information and can be further applied more deeply.
The Wi-Fi network applied to vehicle-ground communication at present switches according to signal strength, and when the signal strength of the associated AP is low and there is a risk that information cannot be transmitted, the vehicle-mounted wireless unit scans other surrounding APs and selects the AP with the strongest signal for association, so that there is a risk that network disconnection and information loss are caused due to untimely switching of the access points. Furthermore, the selection of the AP association simply depends on the plurality of APs detected by the vehicle-mounted wireless unit and the signal intensity thereof, and the judgment of the train running direction, and the AP with the strongest AP signal and consistent with the train running direction is selected from the plurality of APs for access. It is clear that such AP selection and access has the following problems or limitations:
(i) access unpredictability of AP: the Access Point (AP) to be accessed is determined through real-time detection of the vehicle-mounted wireless unit, the verification time of the safety, the stability and the like of the AP is short, and the manual intervention capability is limited;
(ii) the presence of wireless connections is limited: the geographical position of the connection between the train (or the vehicle-mounted wireless unit) and the AP can not be visually presented, and the running state and the wireless connection state of the train can not be accurately evaluated and simulated.
Meanwhile, in order to ensure that the transmission of information is not lost, vehicle-mounted wireless units are generally installed at two ends of a train, and communication can be maintained when the wireless unit at any end fails or a wireless signal to an AP is lost. The signals of adjacent radio units may overlap over the entire route of the trip, and this overlap provides redundancy of radio signals, ensuring radio coverage in the event of alternate failure of one radio unit or every other radio unit. However, in actual situations, the operation conditions of the train will be more complicated, and the operation safety is important, and the redundancy strategy completely depending on the coverage of the AP wireless signals has the problem of poor subjective activity, and the problem of no coverage of the AP wireless signals cannot be quickly and effectively avoided.
Based on the above problems, it is desirable to develop a train wireless communication optimization method or system to ensure smooth access of high signal strength wireless access points, visualization of wireless connection between the wireless access points and the train, and stability of data transmission during wireless transmission during train operation.
Disclosure of Invention
In order to overcome the problems, the inventor of the present invention has made intensive research to integrate train line information, train operation information, and AP location information with a GIS, so that a train-AP-GIS electronic map is displayed integrally, and further an AP with the highest stability coefficient is determined to be accessed by screening the APs, thereby completing the present invention.
The invention aims to provide the following technical scheme:
(1) a method of train wireless communication optimization, the method comprising:
step 110), fusing train line information and train operation information with a Geographic Information System (GIS), and visually displaying train lines and train operation tracks on a GIS electronic map;
step 120), wireless Access Point (AP) position information of a radiation range capable of covering part of lines of the train is obtained, and the AP position information is fused with the GIS; mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information;
step 130), pre-storing the AP attribute information, the AP position information and the AP-route mapping information of the train line into a data storage module;
and 140), in the running process of the train, the vehicle-mounted wireless unit acquires the associable AP, compares the associable AP with the prestored AP-route mapping information, screens the coincident AP as a pre-access AP, and selects the AP with the highest stability coefficient as an access AP from the pre-access APs.
In a preferred embodiment, the step 140) of updating the access AP by the train comprises the following substeps:
substep 141) determining whether the wireless network signal strength of the AP currently associated with the on-board wireless unit is lower than a set wireless network signal strength threshold;
substep 142) of determining the stability factor of the pre-accessed AP and selecting the AP with the highest stability factor for access.
(2) A train wireless communication optimization system for implementing the method of (1) above, the system comprising:
an application platform:
the vehicle-mounted wireless unit is used for acquiring the AP attribute information and the signal intensity and is connected with the AP, so that the train can transmit the communication information to the ground control system through a wireless network;
the information fusion module fuses train line information, train operation information and AP position information with a GIS (geographic information system) as a basis for visual display;
the information mapping module is used for mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information;
the operation management module is used for determining an AP to be accessed according to the associable AP information acquired by the vehicle-mounted wireless unit;
a data platform:
and the data storage module is used for storing the AP attribute information, the AP position information, the AP-route mapping information of the train line and dynamic information generated in the running process of the train.
In a preferred embodiment, the system further comprises a presentation platform, the presentation platform comprising a visualization module,
a visualization module: the method is used for displaying the GIS electronic map, the train line and train running track on the GIS electronic map, the AP information, the distribution and the access state.
The train wireless communication optimization method and the train wireless communication optimization system have the following beneficial effects:
(1) in the invention, train line information, train operation information and AP position information are fused with the GIS, so that a train-AP-GIS electronic map is displayed integrally, and comprehensive and rapid lookup of the train operation information and the AP information is facilitated;
(2) in the invention, a GIS electronic map, train lines and train running tracks on the GIS electronic map, AP information, distribution and access states are displayed through a visualization module, so that the comprehensive understanding of working personnel on the AP information is facilitated;
(3) in the invention, the establishment of the basic AP distribution map provides universal AP distribution information for all trains on a set line, and the corresponding AP distribution map can be correspondingly established for specific types of trains to provide more targeted AP information, so that the AP distribution maps with two fine degrees not only reduce the operation complexity of a wireless communication system and a method, but also are beneficial to the judgment of access to the AP, and have more accurate guiding significance for the connection of the trains and the AP;
(4) in the invention, before the fusion of the AP and the GIS, the attribute information and the position information of the AP which can be used for forming a basic AP distribution diagram at two sides of a train line are checked, and the safety information is perfected, thus being beneficial to the communication safety and stability;
(5) in the invention, the pre-accessed AP is obtained by screening the associable AP obtained by the vehicle-mounted wireless unit and the AP matched with the pre-stored AP-route mapping information, so that the safety factor is high, and the risk of leakage or loss of train communication information is greatly reduced; then selecting the AP with the highest stability coefficient from the pre-accessed APs as an accessed AP, so as to be beneficial to the stability of communication transmission;
(6) in the invention, by combining with a GIS electronic map, the information of the pre-accessed AP can be presented to a worker in a visual display mode, and under the condition that any vehicle-mounted wireless unit on a train cannot be connected with the selected AP or a wireless network is disconnected, another AP with a higher stability coefficient can be artificially selected, so that a redundancy strategy completely depending on AP wireless signal coverage is avoided, the subjective activity is improved, and the problem of no-AP wireless signal coverage can be quickly and effectively avoided.
Drawings
Fig. 1 is a flow chart illustrating a method for optimizing train wireless communication according to a preferred embodiment of the present invention.
Fig. 2 is a block diagram showing a train wireless communication optimization system according to a preferred embodiment of the present invention.
Detailed Description
The invention is illustrated in the following detailed description by means of the figures and examples. The features and advantages of the present invention will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
One aspect of the present invention provides a train wireless communication optimization method, including the following steps:
step 110), fusing train line information and train operation information with a Geographic Information System (GIS), and visually displaying train lines and train operation tracks on a GIS electronic map;
step 120), wireless Access Point (AP) position information of a radiation range capable of covering part of lines of the train is obtained, and the AP position information is fused with the GIS; mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information;
step 130), pre-storing the AP attribute information, the AP position information and the AP-route mapping information of the train line into a data storage module;
and 140), in the running process of the train, the vehicle-mounted wireless unit acquires the associable AP, compares the associable AP with the prestored AP-route mapping information, screens the coincident AP as a pre-access AP, and selects the AP with the highest stability coefficient as an access AP from the pre-access APs.
In step 110, train line information, train running information and a Geographic Information System (GIS) are fused, and train lines and train running tracks are visually displayed on a GIS electronic map.
In the invention, the train line information comprises the geographical position of the train line and the geographical position of the train station.
The train operation information comprises a train number, a train type, a running railway section, a stop station and a geographical position of the train.
In the invention, the train line information and the train operation information are transmitted to the GIS, and the association relation on the geographical position is established. The train line information and the static information (such as the running railway section, the stop station and the like) in the train running information can be fused with the GIS in advance, so that the data transmission and processing amount is reduced, and the subsequent analysis work of train workers is facilitated.
Dynamic information in the train operation information, namely the geographical position of the train is obtained by sensing through a positioning device, the dynamic information has instantaneity and variability and needs to be continuously transmitted to a GIS, and association with the corresponding geographical position in a GIS electronic map is established to form a dynamic moving track of the geographical position of the train on the GIS electronic map. Wherein, positioner includes big dipper satellite positioning device and/or GPS positioner.
In a preferred embodiment, on-board wireless units are installed at both ends of the train for connection with the AP so that the train can transmit communication information to the ground control system via a wireless network. The dynamic information in the train operation information, namely the geographic position of the train operation information is determined by the geographic positions of the vehicle-mounted wireless units at two ends of the train, and the part between the two vehicle-mounted wireless units is considered as a section of the train.
And the GIS electronic map and the train line and the train running track on the GIS electronic map are displayed on a visual module equipped for the train. Wherein, the visualization module comprises a PC display, a mobile handheld device display and the like.
In step 120, wireless AP position information of a radiation range capable of covering part of lines of a train is obtained, and the AP position is fused with a GIS; and mapping the AP attribute information, the AP position information and the train line to obtain mapping information.
In the present invention, the AP for fusing with the GIS is preferably an AP having a high security factor, such as an AP specifically serving train communication, or other APs that are securely authenticated and available for train communication.
In the invention, the AP used for being fused with the GIS is determined by determining the geographic position of the line from the AP to the train and the size of the radiation range of the AP, and if the minimum distance from the AP to the train line is less than or equal to the radiation range of the AP, the AP can not be obviously used for the wireless communication of the train.
In a preferred embodiment, an AP point with the minimum distance from the AP to the train line smaller than a set threshold value is fused with a GIS to form a basic AP distribution map; and screening the APs with the radiation ranges exceeding the set multiple of the length between the two vehicle-mounted wireless units based on the length between the vehicle-mounted wireless units at the two ends of the train aiming at the specific train to form a corresponding AP distribution diagram.
The basic AP distribution diagram has universality, and all trains passing through the line have the basic AP distribution diagram which is the basis of the corresponding basic AP distribution diagram; the aiming-type AP distribution map has more accurate guiding significance on the connection of train-AP.
The radiation range of the AP exceeds the set multiple of the train length, so that the vehicle-mounted wireless units at two ends of the train can share the same AP in a large driving range, the AP switching frequency is reduced, and the stability of data transmission is facilitated.
Generally, the installation position of the AP is near the train running track, and the smaller the minimum distance from the AP to the train line is, the more the loss of the radiation range of the train caused by the large distance from the AP to the train line can be avoided.
The above mentioned "setting multiple" or "setting threshold" is also related to the distribution density of AP, and can be adjusted accordingly according to the development change of AP radiation range, the change of train length of different vehicle models/train numbers and the change of AP distribution density in the field.
In the invention, the AP attribute information and the AP position information are mapped with the train line in the step to obtain mapping information. Wherein the AP attribute information includes at least one of a Service Set Identifier (SSID) including a unique name of the AP, and a Media Access Control (MAC) address. The AP position information is the geographical position information corresponding to the MAC address. The mapping information shows the APs passing through the train line in sequence, and the mapping information obtained based on the basic AP distribution diagram is high in integrity and weak in pertinence; the mapping information obtained based on the type-specific AP distribution diagram is more accurate, and the AP connection predictability is higher.
In step 120, the method further includes checking attribute information and location information of APs on both sides of the train line, which can be used to form the basic AP distribution map. Due to the convenience of the wireless network, the AP distribution network is complicated, the supervision and use information of the AP is not perfect, and the wireless communication stability of the existing train is challenged.
The checking of the AP attribute information and the position information mainly aims at the matching of the AP attribute information and the position information, so that the AP attribute information and the AP position information can be in one-to-one correspondence. Through information verification, the safety of wireless communication can be improved inevitably.
In step 120 of the present invention, it is stated above that the basic AP profile or the specific train-based AP profile is formed based on the position relationship between the AP and the train route, and the attribute information of the AP is the inherent information of the AP, so that the mapping information between the AP attribute information and the position information and the train route has a corresponding relationship with the AP profile (the basic AP profile or the specific train-based AP profile), and the mapping information can be stored and presented not only in the form of a list, but also in a more intuitive manner using the GIS electronic map as a background.
In step 130 of the present invention, before the train runs, the AP attribute information, the AP location information, and the AP-route mapping information of the train line are prestored in the data storage module for the operation management module or the visualization module to call.
The operation management module is technical equipment for supervising, controlling and adjusting the train operation speed, the braking mode, the communication state and the like.
At the moment, the position distribution of the AP and the train line on the GIS electronic map can be displayed in an image form by the visualization module, and the staff can quickly predict or manually select the AP to be connected in the next operation stage by combining the AP-route mapping information list.
In step 140 of the present invention, during the running process of the train, the vehicle-mounted wireless unit obtains the signal strength and attribute information of the associable AP, compares the signal strength and attribute information with the pre-stored AP-route mapping information, screens the coincident AP as the pre-access AP, and selects the AP with the highest stability coefficient as the access AP from the pre-access APs.
In the invention, the associable AP acquired by the vehicle-mounted wireless unit may not be completely overlapped with the pre-stored AP, but only partially overlapped, the non-overlapped AP may be an interfering AP, and the data security risk exists when the AP is selected for use without security verification. The reason why the associable AP is limited in the pre-stored AP is that the associable AP is an AP subjected to security check, such as an AP special for railway communication, the safety factor is high, and the leakage or loss of train communication information is greatly reduced.
In the invention, the update of the access AP by the train comprises the following substeps:
substep 141) determining whether the wireless network signal strength of the AP currently associated with the on-board wireless unit is lower than a set wireless network signal strength threshold;
substep 142) of determining the stability factor of the pre-accessed AP and selecting the AP with the highest stability factor for access.
In substep 141) of the present invention, the set wireless network signal strength threshold is used to determine whether the wireless network signal strength of the AP in use (or pre-access) is capable of performing normal network communication, and the condition that the wireless network signal strength is higher than the set threshold is a precondition for ensuring normal network communication.
In substep 142) of the present invention, the signal strength of the pre-access AP is not lower than the set wireless network signal strength threshold.
In substep 142) of the present invention, the stability factor of the AP is determined by including the minimum distance between the AP and the train line, the radiation range of the AP, and the past stability of the AP.
In the invention, the mathematical model function of the minimum distance between the AP and the train line is as follows:
Figure BDA0002011755640000101
wherein there are M pre-access APs, (x)l,yl) Is the address coordinate of the first pre-access AP; (x)0,y0)～(xn,yn) Is the coordinate of the train line of the road section close to the AP, (x)i,yi) Is one of the coordinates.
In the invention, the radiation range of the AP is the product performance parameter of the AP, and can be acquired by acquiring when the AP is checked.
In the invention, the past stability of the AP is obtained by evaluating the use stability of the AP after the AP is connected in the past, and the higher the use frequency of the AP is, the more accurate the past stability of the AP is. Wherein the stability evaluation criteria include: the AP interruption frequency, the radiation distance of the AP signal on the train line when the AP signal intensity is higher than the wireless network signal intensity threshold value, and the like.
Preferably, the mathematical model function of the stability coefficient is:
Figure BDA0002011755640000102
wherein (x)l,yl) Is the address coordinate of the first pre-access AP; (x)li,yli) Is the coordinate of the train line of the section close to the first pre-access AP; q is the radiation range of AP, QlRadiation range for the first pre-access AP; p is a past stability quantitative value of AP; kqAnd KpIs a correction factor.
In the invention, the stability coefficient is taken as an important parameter, the stability coefficient and the corresponding AP can be visually displayed on a GIS electronic map by a visual module, and an AP-route mapping information list is combined, so that a worker can quickly predict or manually select the AP to be connected in the next operation stage.
In the invention, by combining with a GIS electronic map, the information of the pre-accessed AP can be presented to a worker in a visual display mode, and under the condition that any vehicle-mounted wireless unit on a train cannot be connected with the selected AP or a wireless network is disconnected, another AP with a higher stability coefficient can be artificially selected, so that a redundancy strategy completely depending on AP wireless signal coverage is avoided, the subjective activity is improved, and the problem of no-AP wireless signal coverage can be quickly and effectively avoided.
Another aspect of the present invention provides a train wireless communication optimization system for implementing the above method, the system comprising:
an application platform:
the vehicle-mounted wireless unit is used for acquiring the AP attribute information and the signal intensity and is connected with the AP, so that the train can transmit the communication information to the ground control system through a wireless network;
the information fusion module fuses train line information, train operation information and AP position information with a GIS (geographic information system) as a basis for visual display;
the information mapping module is used for mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information;
and the operation management module is used for determining the AP to be accessed according to the associable AP information acquired by the vehicle-mounted wireless unit.
A display platform:
a visualization module: the system is used for displaying a GIS electronic map, train lines and train running tracks on the GIS electronic map, AP information, distribution and access states; the device is arranged on a train and comprises a PC display, a mobile handheld device display and the like;
a data platform:
and the data storage module is used for storing the AP attribute information, the AP position information, the AP-route mapping information of the train line and dynamic information generated in the running process of the train.
In a preferred embodiment of the present invention, specifically, the information fusion module: screening the AP points with the minimum distance from the AP to the train line smaller than a set threshold value and fusing the AP points with the GIS according to a specific driving route to form a basic AP distribution map;
and screening the APs with the radiation ranges exceeding the set multiple of the length between the two vehicle-mounted wireless units based on the length between the vehicle-mounted wireless units at the two ends of the train aiming at the specific train to form a corresponding AP distribution diagram.
In a preferred embodiment, the operation management module includes the following sub-modules:
the signal strength judging submodule is used for sending an AP replacement or access signal to the judging submodule by judging whether the wireless network signal strength of the AP currently associated with the vehicle-mounted wireless unit and the wireless network signal strength of the pre-accessed AP are lower than a set wireless network signal strength threshold value or not;
screening submodule: the vehicle-mounted wireless unit acquires attribute information of an associable AP, compares the attribute information with prestored AP-route mapping information, and screens an AP with matched information as a pre-access AP;
a judging module: and measuring the stability coefficient of the pre-accessed AP, and selecting the AP with the highest stability coefficient for accessing.
In the invention, the optimization system further comprises a forced change module for enabling the staff to manually switch the accessed AP according to the information of the pre-accessed AP. Examples
Example 1
A train wireless communication optimization system, as shown in fig. 2, comprises an application platform, a presentation platform and a data platform, wherein,
an application platform:
the vehicle-mounted wireless unit is used for acquiring the AP attribute information and the signal intensity and is connected with the AP, so that the train can transmit the communication information to the ground control system through a wireless network;
the information fusion module fuses train line information, train operation information and AP position information with a GIS (geographic information system) as a basis for visual display;
the information mapping module is used for mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information;
the operation management module is used for determining an AP to be accessed according to the associable AP information acquired by the vehicle-mounted wireless unit;
the forced change module is used for enabling a worker to manually switch the accessed AP according to the information of the pre-accessed AP;
a display platform:
a visualization module: the system is used for displaying a GIS electronic map, train lines and train running tracks on the GIS electronic map, AP information, distribution and access states; the device is arranged on a train and comprises a PC display, a mobile handheld device display and the like;
a data platform:
and the data storage module is used for storing the AP attribute information, the AP position information, the AP-route mapping information of the train line and dynamic information generated in the running process of the train.
The system configuration work is as follows: and fusing train line information, train running information and AP position information with the GIS, so that the train line, the train running track and AP distribution are visually displayed on the GIS electronic map.
And pre-storing the AP attribute information, the AP position information and the AP-route mapping information of the train line to a data storage module before the train runs. Based on the basic type AP distribution map, a target type AP distribution map is obtained.
And in the running process of the train, the wireless network signal intensity of the AP currently associated with the vehicle-mounted wireless unit is found to be close to the set wireless network signal intensity threshold value. And on the train travelling route, acquiring 10 APs with wireless network signal intensity higher than the wireless network signal intensity by vehicle-mounted wireless units, wherein the information of 6 APs is matched with corresponding information in the AP-route mapping information and is distributed in a specific AP distribution map, and then the 6 APs are pre-access APs.
And judging the stability coefficients of the 6 APs, wherein the stability coefficients of the APs are determined by the minimum distance between the APs and the train line, the radiation range of the APs and the past stability of the APs.
The mathematical model function of the minimum distance of the AP from the train line is as follows:
Figure BDA0002011755640000141
the mathematical model function for the stability coefficient is:
Figure BDA0002011755640000142
Kpis 0.01, KqIs 1.25;
the minimum distance between the AP1 and the train line is 12m, the Q1 is 3000m, and the P1 is 0.98;
the minimum distance between the AP2 and the train line is 15m, the Q2 is 3000m, and the P2 is 0.90;
the minimum distance between the AP3 and the train line is 20m, the Q3 is 3000m, and the P3 is 0.95;
the minimum distance between the AP4 and the train line is 18m, the Q4 is 3000m, and the P4 is 0.88;
the minimum distance between the AP5 and the train line is 100m, the Q5 is 3000m, and the P5 is 1.00;
the minimum distance between the AP6 and the train line is 550m, the Q6 is 3000m, and the P6 is 0.85;
since the stability factor of the AP1 is highest, the AP1 is selected for access.
The present invention has been described above in connection with preferred embodiments, but these embodiments are merely exemplary and merely illustrative. On the basis of the above, the invention can be subjected to various substitutions and modifications, and the substitutions and the modifications are all within the protection scope of the invention.

Claims (8)

1. A method for optimizing train wireless communication is characterized by comprising the following steps:
step 110), fusing train line information and train operation information with a Geographic Information System (GIS), and visually displaying train lines and train operation tracks on a GIS electronic map;
step 120), wireless Access Point (AP) position information of a radiation range capable of covering part of lines of the train is obtained, and the AP position information is fused with the GIS; mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information;
step 130), pre-storing the AP attribute information, the AP position information and the AP-route mapping information of the train line into a data storage module;
step 140), in the running process of the train, the vehicle-mounted wireless unit acquires an associable AP, compares the associable AP with prestored AP-route mapping information, screens the coincident AP as a pre-access AP, and selects an AP with the highest stability coefficient as an access AP from the pre-access APs;
the stability coefficient of the AP is determined by the minimum distance between the AP and the train line, the radiation range of the AP and the past stability of the AP;
the mathematical model function of the stability coefficient is obtained by:
Figure FDA0002936612470000011
wherein (x)l,yl) Is the address coordinate of the first pre-access AP; (x)li,yli) Is the coordinate of the train line of the section close to the first pre-access AP; q is the radiation range of AP, QlRadiation range for the first pre-access AP; p is a past stability quantitative value of AP; kqAnd KpIs a correction factor.
2. The method of claim 1, wherein in step 110), the trainline information includes a trainline geographical location and a train station geographical location;
the train operation information comprises a train number, a train type, an operation railway section, a stop station and a geographical position of the train;
and transmitting the train line information and the train operation information to the GIS, and establishing the association relation on the geographic position.
3. The method according to claim 1, wherein in step 110), the train line information and the static information in the train operation information can be fused with the GIS in advance;
dynamic information in the train operation information, namely the geographical position of the train, is obtained by sensing through the positioning device and is continuously transmitted to the GIS, and the association with the corresponding geographical position in the GIS electronic map is established.
4. The method according to claim 1, wherein the step 120) further comprises checking attribute information and location information of the APs accessible on both sides of the train line.
5. The method according to claim 1, wherein the updating of the access AP by the train in step 140) comprises the following substeps:
substep 141) determining whether the wireless network signal strength of the AP currently associated with the on-board wireless unit is lower than a set wireless network signal strength threshold;
substep 142) of determining the stability factor of the pre-accessed AP and selecting the AP with the highest stability factor for access.
6. A train wireless communication optimization system for implementing the method of any one of claims 1 to 5, the system comprising:
an application platform:
the vehicle-mounted wireless unit is used for acquiring the AP attribute information and the signal intensity and is connected with the AP, so that the train can transmit the communication information to the ground control system through a wireless network;
the information fusion module fuses train line information, train operation information and AP position information with a GIS (geographic information system) as a basis for visual display;
the information mapping module is used for mapping the AP attribute information, the AP position information and the train line to obtain AP-route mapping information;
the operation management module is used for determining an AP to be accessed according to the associable AP information acquired by the vehicle-mounted wireless unit;
the operation management module comprises the following sub-modules:
the signal strength judging submodule is used for sending an AP replacement or access signal to the judging submodule by judging whether the wireless network signal strength of the AP currently associated with the vehicle-mounted wireless unit and the wireless network signal strength of the pre-accessed AP are lower than a set wireless network signal strength threshold value or not;
screening submodule: the vehicle-mounted wireless unit acquires attribute information of an associable AP, compares the attribute information with prestored AP-route mapping information, and screens an AP with matched information as a pre-access AP;
a judging module: determining the stability coefficient of the pre-accessed AP, and selecting the AP with the highest stability coefficient for accessing;
the stability coefficient of the AP is determined by the minimum distance between the AP and the train line, the radiation range of the AP and the past stability of the AP;
the mathematical model function of the stability coefficient is obtained by:
Figure FDA0002936612470000031
wherein (x)l,yl) Is the address coordinate of the first pre-access AP; (x)li,yli) Is the coordinate of the train line of the section close to the first pre-access AP; q is the radiation range of AP, QlRadiation range for the first pre-access AP; p is a past stability quantitative value of AP; kqAnd KpIs a correction factor;
a data platform:
and the data storage module is used for storing the AP attribute information, the AP position information, the AP-route mapping information of the train line and dynamic information generated in the running process of the train.
7. The system of claim 6, further comprising a presentation platform, the presentation platform comprising a visualization module,
a visualization module: the method is used for displaying the GIS electronic map, the train line and train running track on the GIS electronic map, the AP information, the distribution and the access state.
8. The system of claim 6, wherein the optimization system further comprises a mandatory change module configured to enable a worker to manually switch the access AP according to the information of the pre-access AP.
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