CN113993155A - Online calculation method for train-ground communication transmission time delay of magnetic suspension train - Google Patents
Online calculation method for train-ground communication transmission time delay of magnetic suspension train Download PDFInfo
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- CN113993155A CN113993155A CN202111226449.6A CN202111226449A CN113993155A CN 113993155 A CN113993155 A CN 113993155A CN 202111226449 A CN202111226449 A CN 202111226449A CN 113993155 A CN113993155 A CN 113993155A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- 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
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- 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]
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses an online calculation method for train-ground communication transmission time delay of a magnetic levitation train, which comprises the following steps: s1, calculating the time delay T of the vehicle-mounted radio control unit1(ii) a S2, calculating time delay of the subarea wireless control unit
S3, calculating the total time delay T of the magnetic suspension train vehicle-ground communication transmission:
the invention uses the clocks of the vehicle-mounted and ground equipment to carry out accurate and effective communication time delay calculation, and the calculation method is simple and the result is real-time and reliable. The communication time delay can be given online, and the state of the communication system can be monitored in real time.
Description
Technical Field
The invention belongs to a train-ground communication technology of a high-speed magnetic levitation track traffic system, and particularly relates to an online calculation method for train-ground communication transmission time delay of a magnetic levitation train.
Background
The high-speed maglev train is a novel vehicle, and informatization, safety and intellectualization are inevitable trends in development of the high-speed maglev train. Maglev train-to-ground communication systems are one of the key systems of a train, known as the "nervous system" of the train. Because the maglev train has influence factors such as communication protocol conversion, operation environment change and the like in the high-speed operation process, the time delay is inevitably generated in the transmission process of the signals. Train-ground communication transmission delay influences the operation of a train, so that data cannot be transmitted in time, and the train cannot be normally controlled, dragged and braked due to the overlarge delay, so that the comfort level of passengers and the safety of the passengers are influenced. Therefore, the online monitoring and analysis of the train-ground communication transmission delay play an important role in the high-speed safe operation of the magnetic-levitation train.
At present, the research on train-ground communication transmission delay at home and abroad mainly aims at a GSM-R mobile communication system and an LTE-M (long term evolution for urban rail transit) communication system, and the two communication systems are widely applied to a wheeled high-speed train traffic system.
The GSM-R is used as a comprehensive platform of railway communication, and large-capacity bidirectional data transmission is carried out between a train and the ground, so that closed-loop control of the train is realized. In the existing research, the data transmission delay in the GSM-R system is mainly composed of the following parts: processing delays of a Mobile Station (MS), a Base Station Subsystem (BSS) and a network subsystem (NSS); transmission delay between mobile service switching center (MSC) and Base Station Controller (BSC), Base Transceiver Station (BTS); transmission delay between local MSCs.
In LTE-M communication systems, similar delays exist for data packet transmission. In the current research and analysis, the total time delay is mainly divided into three parts: the delay generated when the data packet is accessed into the LTE-M system for transmission, the queuing delay generated when a plurality of data packets need to be transmitted simultaneously, and the time consumption generated by processing the data packets with various sizes under the limited throughput of the system, namely the sum of the processing delays of all parts of the data packets.
Although the above communication system indicates the composition and allocation of the delay, it is described only theoretically, and there is no online delay calculation method, and there is no practical operability.
Compared with a wheeled high-speed train, the transmission delay and reliability of the high-speed maglev train to a train-ground communication system are higher, for example, the traction power is closely related to the train position, and the train position parameters need to be transmitted from the train to a ground traction and operation control center. In a magnetic suspension train communication network, the transmission delay of train data in the process of transmitting the train data from a train to a ground control center needs to meet requirements, once the data delay exceeds the system requirements, the train cannot be normally pulled, frequent braking is caused, even the driving safety is endangered, and the train operation efficiency is reduced.
If parameters such as train position and the like are transmitted to the target system, the time delay of data transmission can be given, and great help is provided when the target system uses the parameters.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the online calculation method for the train-ground communication transmission delay of the maglev train, which utilizes the clocks of the train-mounted equipment and the ground equipment to carry out accurate and effective communication delay calculation, has a simple calculation method and real-time and reliable results.
The purpose of the invention is realized by the following technical scheme: an online calculation method for the train-ground communication transmission delay of a magnetic levitation train comprises the following steps:
s1, calculating the time delay of the vehicle-mounted radio control unit, comprising the following substeps:
s11, starting a magnetic suspension train ground communication system, and clearing a vehicle-mounted radio control unit timer;
s12, the vehicle-mounted equipment transmits train data to the magnetic suspension train vehicle-mounted radio control unit, the vehicle-mounted radio control unit starts timing after receiving the data and waits for a communication instruction of the subarea radio control unit, if the vehicle-mounted radio control unit receives the communication instruction of the subarea radio control unit, the timing is stopped to obtain a vehicle-mounted time delay T1, and if not, the vehicle-mounted equipment continuously waits and times;
s13, after receiving the communication instruction of the subarea wireless control unit, the vehicle-mounted radio control unit adds the vehicle-mounted time delay T1 into a response data frame and transmits the response data frame to the subarea wireless control unit, and the train vehicle-mounted radio control unit enters a next time delay calculation preparation state after the time delay calculation of the train vehicle-mounted radio control unit is finished;
s2, calculating the time delay of the subarea wireless control unit, comprising the following substeps:
s21, starting a magnetic suspension train ground communication system, and resetting a partition wireless control unit timer;
s22, the subarea wireless control unit sends a communication instruction and data to the train running into the communication area of the subarea wireless control unit and starts timing;
s23, the command and data sent by the subarea wireless control unit are firstly sent to a ground radio base station through an optical fiber network, the ground radio base station transmits the communication command and data to a vehicle-mounted radio base station in a wireless mode, and the vehicle-mounted radio base station sends the received communication command and data to the vehicle-mounted radio control unit;
s24, the vehicle-mounted radio control unit responds after receiving the communication command and the data, and starts to transmit the data to the subarea radio control unit, wherein the data comprises the time delay T of the vehicle-mounted radio control unit1；
S25, the data sent by the vehicle radio control unit is transmitted to the vehicle radio base station through the vehicle network after being coded, then is transmitted to the ground radio base station in a wireless mode, the ground radio base station converts and decodes the received signal and sends the converted signal to the subarea radio control unit, the subarea radio control unit stops timing after receiving the response data frame, and the ground time delay T is obtained2(ii) a Obtaining a time delay of a one-way process of transmitting a data frame from the on-board radio control unit to the sectorized radio control unit
S3, calculating the train-ground communication transmission total of the magnetic suspension trainTime delay T:
the invention has the beneficial effects that: the invention does not need high-precision clock synchronization such as GPS, Beidou and the like, can utilize the own clocks of the vehicle-mounted equipment and the ground equipment to carry out accurate and effective communication time delay calculation, and has simple calculation method and real-time and reliable result. The method can provide the communication delay on line, can monitor the state of the communication system in real time, and provides important parameters for the follow-up system to correct and compensate the communication delay. The method has instructive significance for researching engineering deployment of a maglev train operation control system, a traction control system, a train-ground communication system and the like, and has reference value for eliminating communication delay influence.
Drawings
FIG. 1 is a schematic diagram of a vehicle-to-ground communication system;
FIG. 2 is a flow chart of the online calculation method for the train-ground communication transmission delay of the maglev train according to the invention;
fig. 3 is a schematic diagram of the transmission delay of the train-ground communication of the magnetic suspension train.
Detailed Description
The maglev train-ground communication system is an important component of a real-time train control system, and the real-time performance and reliability of information transmission are required to be extremely high. The invention mainly provides an on-line calculation method for the train-ground communication time delay of a magnetic levitation train, which is mainly used for a train-ground communication system of a magnetic levitation track traffic system and according to the transmission process of train communication data between trains and ground.
The invention is realized with the following preconditions: 1. the vehicle-mounted radio control equipment and the ground radio control equipment can accurately time (only relative time is needed, and absolute time is not needed); 2. the vehicle and the ground are in response communication, namely, the vehicle-mounted radio control equipment does not actively transmit data, and transmits the data to the ground in response only when receiving a corresponding ground radio signal.
The technical idea of the present invention is described below.
The maglev train-ground communication system is mainly responsible for information acquisition and utilization, information collection and decomposition, information source coding and decoding, reliable and transparent transmission of state information, control commands, diagnosis information and the like between the maglev train and ground equipment, and has a great relation to driving safety. Because the maglev train has higher running speed and the train is separated from the ground, the traditional method of utilizing track loop communication to lose effectiveness is caused, and the train-ground communication completely depends on a wireless mode, thereby providing more strict requirements on the reliability and the time delay of the system.
Fig. 1 is a schematic representation of the composition of a maglev train car-to-ground communication system, consisting of a ground radio system comprising a sectorized radio control unit (DRCU), a ground Radio Base Station (RBS) and an on-board radio system comprising an on-board radio control unit (MRCU) and an on-board radio base station (MSB) and further on-board equipment on the train.
In a broad sense, the data transmission delay refers to the total time required for a data frame to be transmitted from one station until the data frame is completely received by another station. The transmission delay in the invention refers to the time required for data to be transmitted from the vehicle-mounted equipment to the DRCU to be completely received.
And in the running process of the vehicle, data updating needs to be carried out on the ground partition equipment in real time, and after the vehicle-mounted equipment obtains vehicle information, the original data is encoded and transmitted to the MRCU through an interface. The MRCU processes and buffers the data frames upon receipt and starts timing. The MRCU does not actively send the vehicle information to the ground after receiving the vehicle information, but waits for a sending control command from the DRCU to send data to the ground. The MRCU immediately stops timing and obtains a time delay T once receiving a data sending instruction of the DRCU1Then MRCU delays T1Added to the response data frame and sent to the DRCU. The latency of this process includes the entire latency from the sending of the first data by the vehicle device to the sending of that data by the MRCU to the DRCU.
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 2, the method for online calculating the train-to-ground communication transmission delay of the maglev train of the present invention includes the following steps:
s1, calculating the time delay of the vehicle-mounted radio control unit, comprising the following substeps:
s11, starting a magnetic suspension train ground communication system, and clearing a vehicle-mounted radio control unit timer;
s12, the train data is transmitted to the train-mounted radio control unit of the maglev train by the vehicle-mounted equipment, the train-mounted radio control unit starts timing after receiving the data and waits for the communication instruction of the subarea radio control unit, and the timing is stopped if the train-mounted radio control unit receives the communication instruction of the subarea radio control unit, so that the train-mounted time delay T is obtained1Otherwise, continuously waiting and timing;
s13, after the vehicle-mounted radio control unit receives the communication instruction of the partition radio control unit, the vehicle-mounted radio control unit delays the vehicle-mounted time by T1The time delay calculation is finished by the train-mounted radio control unit, and the next time delay calculation preparation state is entered;
s2, calculating the time delay of the subarea wireless control unit, comprising the following substeps:
s21, starting a magnetic suspension train ground communication system, and resetting a partition wireless control unit timer;
s22, the subarea wireless control unit sends a communication instruction to the train entering the communication area of the subarea wireless control unit and starts timing;
s23, the command and data sent by the subarea wireless control unit are firstly sent to a ground radio base station through an optical fiber network, the ground radio base station transmits the communication command and data to a vehicle-mounted radio base station in a wireless mode, and the vehicle-mounted radio base station sends the received communication command and data to the vehicle-mounted radio control unit;
s24, the vehicle-mounted radio control unit responds after receiving the communication command and the data, and starts to transmit the data to the subarea radio control unit, wherein the data comprises the time delay T of the vehicle-mounted radio control unit1；
S25, the data sent by the vehicle radio control unit is transmitted to the vehicle radio base station through the vehicle network after being coded, and then is transmitted to the ground radio base station in a wireless modeThe received signal is converted, decoded and fed into a subarea wireless control unit, and the subarea wireless control unit stops timing after receiving the response data frame to obtain the ground time delay T2(ii) a Considering that the process of the two-way communication between the train and the ground is the same or similar, the time delay of the one-way process of the data frame transmission from the train-mounted radio control unit to the subarea radio control unit is
S3, calculating the total time delay T of the magnetic suspension train vehicle-ground communication transmission, as shown in figure 3, transmitting the vehicle data to the MRCU through the vehicle-mounted equipment, and then transmitting the vehicle data to the ground DRCU through the MRCU, namely realizing the vehicle-to-ground data updating. The time delays of the two processes can be obtained from communication data frames, and the total transmission time delay T can be calculated on line by the DRCU end, which is the sum of the two transmission time delays:
it will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (1)
1. An online calculation method for the transmission delay of train-ground communication of a magnetic levitation train is characterized by comprising the following steps:
s1, calculating the time delay of the vehicle-mounted radio control unit, comprising the following substeps:
s11, starting a magnetic suspension train ground communication system, and clearing a vehicle-mounted radio control unit timer;
s12, the train data is transmitted to the train radio control unit of the maglev train by the train equipment, the train radio control unit starts timing after receiving the data and waits for the subareaIf the vehicle-mounted radio control unit receives the communication instruction of the subarea radio control unit, the timing is stopped to obtain the vehicle-mounted time delay T1Otherwise, continuously waiting and timing;
s13, after the vehicle-mounted radio control unit receives the communication instruction of the partition radio control unit, the vehicle-mounted radio control unit delays the vehicle-mounted time by T1The time delay calculation is finished by the train-mounted radio control unit, and the next time delay calculation preparation state is entered;
s2, calculating the time delay of the subarea wireless control unit, comprising the following substeps:
s21, starting a magnetic suspension train ground communication system, and resetting a partition wireless control unit timer;
s22, the subarea wireless control unit sends a communication instruction and data to the train running into the communication area of the subarea wireless control unit and starts timing;
s23, the command and data sent by the subarea wireless control unit are firstly sent to a ground radio base station through an optical fiber network, the ground radio base station transmits the communication command and data to a vehicle-mounted radio base station in a wireless mode, and the vehicle-mounted radio base station sends the received communication command and data to the vehicle-mounted radio control unit;
s24, the vehicle-mounted radio control unit responds after receiving the communication command and the data, and starts to transmit the data to the subarea radio control unit, wherein the data comprises the time delay T of the vehicle-mounted radio control unit1；
S25, the data sent by the vehicle radio control unit is transmitted to the vehicle radio base station through the vehicle network after being coded, then is transmitted to the ground radio base station in a wireless mode, the ground radio base station sends the received signal into the subarea radio control unit after converting and decoding, the subarea radio control unit stops timing after receiving the response data frame, and the ground time delay T is obtained2(ii) a Obtaining a time delay of a one-way process of transmitting a data frame from the on-board radio control unit to the sectorized radio control unit
S3, calculating the total time delay T of the magnetic suspension train vehicle-ground communication transmission:
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Cited By (1)
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