CN103457655B - The information transmission system and method - Google Patents

Abstract

The invention discloses an information transmission system, comprising a first information transmission subsystem installed only at a station and a second information transmission subsystem installed on a train, the first information transmission subsystem and the second information transmission subsystem The system is configured to establish at least one wireless connection when the train stops at the station, and the first information transmission subsystem transmits data information to the second information transmission subsystem through the wireless connection, and the first information transmission The subsystem and the second information transmission subsystem are further configured to disconnect the at least one wireless connection when the train leaves the station. The invention also discloses an information transmission method. Through the information transmission system and method of the present invention, the throughput between the train and the trackside facilities can be greatly improved, and high-speed data transmission services can be realized.

Description

Information transmission system and method

technical field

The invention relates to wireless communication technology, in particular to an information transmission system and method.

Background technique

Compared with wired communication technology, wireless local area network (WLAN) technology has the advantages of low component cost and convenient installation, so it has been widely used in subway systems to realize train control system and train and passenger information system in train and train trackside Information transfer between facilities. In the current subway system, a wireless client is usually installed on a running train, and an access point (AP, Access Point) is set beside the track where the train is running. When the train is running on the track, the wireless client on the train The client can establish a wireless connection with the access point set beside the track to perform information exchange, realize train control and realize the application of passenger information system.

It is known that in the train control system, the amount of information that needs to be exchanged to complete the control of the train is not large, so the requirement for the data transmission rate between the access point and the wireless client is not high. However, in order to realize passenger The application of the information system, especially the video service, requires a high transmission rate between the access point and the wireless client. For example, when a moving train is playing a video program to passengers, the access point needs to transmit a large amount of video data to the wireless client in a short time, especially if the video program being played is a high-definition video program, at least 12Mbps is required (megabits per second) transmission bandwidth to meet the requirements. This requires a high-throughput wireless transmission technology to be used between the access point and the wireless client. However, the existing wireless transmission technology is difficult to meet the above-mentioned high communication rate requirements. For example, when using the 802.11g technology of WLAN, even in the ideal state where the signal strength is strong enough and free from any interference, a wireless connection is in the application layer. The throughput limit of the access point can reach 24Mbps, and in the real application environment, since the interference from other wireless communication systems is inevitable and the signal strength is not strong enough, the throughput between the access point and the wireless client The volume is far below the above-mentioned throughput limit. Even if both the access point and the wireless client are fixed, the throughput between the access point and the wireless client can only reach about 10 Mbps at most, and this throughput cannot support the transmission of high-definition video programs. Moreover, when the train is moving fast, because the wireless client needs to frequently switch between the access points, it will further reduce the throughput between the access point and the wireless client.

Contents of the invention

In order to solve the above problems, the present invention proposes an information transmission system and an information transmission method, which can provide high-speed data transmission services for stations and trains.

An information transmission system according to an embodiment of the present invention includes a plurality of first information transmission subsystems and at least one second information transmission subsystem installed on a train, wherein the plurality of first information transmission subsystems are only installed in At least two stations for the train to stop at and each station is provided with at least one first information transmission subsystem, the first information transmission subsystem and the second information transmission subsystem are configured so that when the train stops at At least one wireless connection is established at the station, and the first information transmission subsystem transmits data information to the second information transmission subsystem through the wireless connection, and the first information transmission subsystem and the second information transmission subsystem The system is further configured to disconnect the at least one wireless connection when the train leaves the station.

Further, in a preferred embodiment, the information transmission system further includes a control center configured to determine the data information to be transmitted by the first information transmission subsystem installed at each of the stations and send it to the corresponding The first information transmission subsystem. The data information to be transmitted by the first information transmission subsystem at other stations is adjusted according to the feedback information of the first information transmission subsystem installed at one of the at least two stations.

Further, the first information transmission subsystem includes a first control device and at least one access point, and the second information transmission subsystem includes a second control device and at least one wireless client. Wherein, the at least one access point and the at least one client are configured such that one of the access points establishes the wireless connection with one of the clients when the train stops at the station, and the at least An access point and the corresponding at least one wireless client are further configured to disconnect the wireless connection when the train leaves the station.

Further, the first information transmission subsystem includes at least two access points, and the first control device is configured to divide the data information into a number of information parts corresponding to the access points to pass through the access points respectively. The access point sends to the corresponding wireless client, wherein the second information transmission subsystem includes at least two wireless clients, and the second control device combines the information received by each of the clients into a The data information transmitted by the first information transmission subsystem.

Another aspect of the present invention provides an information transmission method for transmitting information between a train and the stations it stops at, wherein the train stops at at least two of the stations, and the method includes: when the train stops at the stations When the station is described, at least one wireless connection is established between a plurality of first information transmission subsystems and a second information transmission subsystem installed on the train, wherein the plurality of first information transmission subsystems are only respectively installed in At least one of the first information transmission subsystems is installed at the at least two stations and each station; data information is transferred from the first information transmission subsystem to the second information transmission subsystem through the wireless connection; and disconnecting said at least one wireless connection when said train leaves said station.

Further, in one embodiment, the transferring data information between the first information transmission subsystem and the second information transmission subsystem through the wireless connection includes: determining the The first information transmission subsystem needs to transmit the data information and send it to the corresponding first information transmission subsystem. Further, the data information to be transmitted by the first information transmission subsystem at other stations is adjusted according to the feedback information of the first information transmission subsystem installed at one of the stations.

Further, the establishment of at least one wireless connection between the plurality of first information transmission subsystems and the second information transmission subsystem installed on the train includes: accessing at least one of the first information transmission subsystems Establishing the at least one wireless connection between the point and at least one wireless client of the second information transmission subsystem, and wherein the disconnecting the at least one wireless connection includes disconnecting the at least one access point from the corresponding The wireless connection established between wireless clients.

Further, the first information transmission subsystem and the second information transmission subsystem establish two or more corresponding wireless connections through two or more access points and wireless clients, wherein the Transferring data information between the first information transmission subsystem and the second information transmission subsystem through a wireless connection includes: dividing the data information into information parts corresponding to the number of wireless connections to pass through the interface respectively sending to the corresponding wireless client by the entry point; and merging the information received by each client into the data information transmitted by the first information transmission subsystem.

Still another aspect of the present invention provides a machine-readable storage medium storing instructions for executing the above information transmission method.

In yet another aspect of the present invention, a computer program is provided, which executes the above information transmission method when the computer program is run in a machine.

The present invention can obtain a higher transmission rate by establishing at least one wireless connection between the first information transmission subsystem and the second information transmission subsystem when the train enters and stops, thereby providing high-speed data transmission services for the station and the train.

Description of drawings

FIG. 1 is a schematic diagram of the internal structure of the information transmission system described in the embodiment of the present invention;

2 is a schematic structural diagram of the first information transmission subsystem described in the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a second information transmission subsystem according to an embodiment of the present invention;

Fig. 4 is a flow chart of the information transmission method described in the embodiment of the present invention;

detailed description

Fig. 1 shows an embodiment of the present invention, an information transmission system 100 to realize high-speed data transmission services between trains and stations.

The information transmission system 100 includes: a plurality of first information transmission subsystems 200 installed only at the station where the train stops and a second information transmission subsystem 300 installed on the train, wherein, when the train stops at the station, the first information The transmission subsystem 200 establishes at least one wireless connection 400 with the second information transmission subsystem 300, and the first information transmission subsystem 200 transmits to the second information transmission subsystem through the established at least one wireless connection 400. Data information of the transmission subsystem, such as video program data or high-definition video program data, etc. As known to those skilled in the art, although in the present invention, the purpose is to send data from the first information transmission subsystem to the second information transmission subsystem, but according to the needs of data transmission, the second information transmission subsystem also sends data to the first information transmission subsystem. The information transmission subsystem sends relevant data, for example, including but not limited to, response messages and the like. Further, when the train leaves the station, the first information transmission subsystem 200 and the second information transmission subsystem 300 disconnect at least one established wireless connection 400 to stop the transmission of data information.

The plurality of first information transmission subsystems can be installed at two or more stations, and each station can install at least one first information transmission subsystem. In this way, the above-mentioned information transmission system 100 will also include a control center 500 for controlling a plurality of first transmission subsystems 200, for determining the data information that needs to be transmitted by the first information transmission subsystem 200 in each station, and will require The data information transmitted by the first information transmission subsystem 200 in each station is distributed to the first information transmission subsystem 200 in each station. In one example, each station is equipped with the same number of first information transmission subsystems. In another example, each station installs a different number of first information transmission subsystems. Preferably, for the convenience of installation and use, each station is equipped with a first information transmission subsystem.

In one embodiment, the control center 500 may send respective data information to the first information transmission subsystem 200 installed at each station in advance. When the train stops at each station, the first information transmission subsystem 200 on the station will transmit the corresponding data information to the second information transmission subsystem 300 . The deployment location of the control center 500 can be determined according to specific applications, as long as it can perform data communication with each first information transmission subsystem.

Moreover, the control center 500 may also adjust the data information transmitted by the first information transmission subsystem at other stations according to the feedback information of the first information transmission subsystem at one station. For example, when the train stops at the current station, if the first information transmission subsystem 200 does not send all data information to be transmitted to the second information transmission subsystem 300, it can send feedback information to notify the control center 500, and the control center 500 will The data information will be adjusted so that the untransmitted part is transmitted by the first transmission subsystem 200 at the next station to the second information transmission subsystem 300 when the train stops at that station.

In order to realize the wireless transmission function, the first information transmission subsystem 200 includes a first control device and at least one access point, wherein the system 200 can be respectively provided with a cache device corresponding to each access point. An example of the above-mentioned first information transmission subsystem 200 is shown in FIG. The entry points 203 are connected in one-to-one correspondence. Or, in another example, the caching device 202 can be integrated with the access point 203 .

Correspondingly, the second information transmission subsystem 300 includes a second control device and at least one wireless client, wherein the system 300 may be respectively provided with a cache device corresponding to each wireless client. An example of the above-mentioned second information transmission subsystem 300 is shown in FIG. Multiple cache devices 302 are connected in one-to-one correspondence. Or, in another embodiment, the caching device 302 can be integrated with the wireless client 301 .

When the train stops at the station, each access point 203 of the first information transmission subsystem 200 establishes a wireless connection 400 with the corresponding wireless client 301 of the second information transmission subsystem 300 respectively, and then, the buffer memory corresponding to each access point 203 The data information in the device is transmitted to the cache device corresponding to the corresponding wireless client 301 through the wireless connection. When the train leaves the station, the access point 203 respectively disconnects the established wireless connection 400 with the corresponding wireless client 301, thereby stopping the transmission of information.

Specifically, the above-mentioned first control device 201 divides the data information to be sent by the first information transmission subsystem 200 into information parts corresponding to the number of access points, and buffers these information parts in the corresponding access points. In the cache device 202. These access points 203 can be installed close to the stop position of the train, for example, they are respectively arranged beside the tracks in the station. After the wireless connection, the access point sends the respective information part to the corresponding wireless client 301 .

Correspondingly, the wireless client 301 is set on the train, for example, can be distributed along the length of the train. As mentioned above, when the train stops at a station, the wireless client 301 establishes a wireless connection with the corresponding access point 203 respectively. The wireless client 301 receives the information part transmitted by the corresponding access point 203 , and caches the received information part in the respective corresponding cache devices 302 . The above-mentioned second control device 303 combines the information received by each wireless client 301 into the data information sent by the first information transmission subsystem 200 . Subsequently, the data information is transmitted to the passenger information system on the train through the communication device in the train.

Through the above-mentioned information transmission system, a large amount of data (such as a long video program data) can be divided into multiple parts, and when the train stops at each station, one or more parts are transmitted to the communication device of the train, and then the The acquired data is sent to the passenger information system on the train, such as playing a buffered video program to the passengers on the train. In this way, the data does not need to be transmitted in real time, so that the currently commonly used data transmission bandwidth can be used.

Fig. 4 shows another embodiment of the present invention, an information transmission method 500, which utilizes the above-mentioned information transmission system 100 to transmit information between the train and the station, including:

Step 510, when the train stops at a station, the first information transmission subsystem 200 establishes at least one wireless connection 400 with the second information transmission subsystem 300;

Step 520, the first information transmission subsystem 200 transmits data information, such as video program data or high-definition video program data, etc., to the second information transmission subsystem through the wireless connection 400;

Step 530, disconnect the wireless connection when the train leaves the station, that is, disconnect the wireless connection between the access point and the wireless client.

In the above method, step 510 further includes the first information transmission subsystem 200 establishing at least one wireless connection 400 with at least one wireless client 301 of the second information transmission subsystem 300 through at least one access point 203 thereof. In one embodiment, multiple access points are used to establish corresponding multiple wireless connections with multiple wireless clients.

The above step 520 further includes: when the first information transmission subsystem is installed in at least two stations, determine the data information to be transmitted by the first information transmission subsystem installed in each station and send it to the corresponding first information transmission subsystem . Further, the feedback information of the first information transmission subsystem installed at one of the stations adjusts the data information to be transmitted by the first information transmission subsystems at other stations.

Step 520 also includes: when multiple access points establish corresponding multiple wireless connections with multiple wireless clients, divide the data information into information parts corresponding to the number of established wireless connections, and pass these information parts through corresponding interfaces The access point transmits to the wireless client via the wireless connection, and combines the information received by each wireless client into the data information, that is, restores the data information in the second information transmission subsystem.

It should be noted that, in order to reduce the interference between multiple wireless connections, different frequency bands can be assigned to each wireless connection, and the bandwidth can be reduced by rationally allocating the frequencies occupied by multiple wireless connections; or a high-gain directional antenna can be used to reduce multiple interference between wireless connections. In addition, the above multiple wireless connections may use the same wireless transmission technology or different wireless transmission technologies. The cache device may use any existing appropriate device, and each cache device may be the same or different.

As can be seen from the data transmission system and method described in this embodiment, since in this embodiment, the wireless connection is only established when the train stops and is disconnected when the train starts running, that is, the wireless connection From the establishment to the disconnection process, the access point and the wireless client are fixed, so the established wireless connection is relatively stable, and a higher transmission rate can be obtained.

In addition, in this embodiment, when at least one (especially two or more) wireless connections are established between the first information transmission subsystem 200 and the second information transmission subsystem 300, the total throughput that can be obtained will be It is several times the throughput of a single wireless connection, so it is easy to meet the transmission bandwidth requirements of video program data or high-definition video data. Moreover, the transmission system and method provided by this embodiment are very easy to expand, and can easily meet the transmission rate requirements of various services.

Furthermore, in this embodiment, the first information transmission subsystem is installed at the station rather than on the track of the entire train. Therefore, the infrastructure of the entire information transmission system (such as the access points to be installed and the required The cost of laying cables, etc.) and the costs of installation, operation and maintenance are also limited. Alternatively, the embodiments of the present invention can also be combined with existing equipment for train data transmission, wherein such existing equipment is arranged along the train track as mentioned above. In this way, existing equipment can be utilized as a system supplement of the present invention. For example, the system of the present invention can be used to transmit a large amount of non-real-time information when the train stops at a station, and at the same time, the existing system can be used to transmit a small amount of real-time data during the running of the train.

Finally, since the first information transmission subsystem 200 needs to send a large amount of information to be sent to the second information transmission subsystem by the access point 203, it is divided into multiple information parts and cached in multiple cache devices 202, and passed A plurality of wireless connections 400 are sent to the second information transmission subsystem 300; and in the second information transmission subsystem 300, a plurality of information parts received by the wireless client 301 are also respectively cached in a plurality of cache devices 302, such The way of parallel storage will also greatly reduce the requirements for the reading and writing speed and storage capacity of a single cache device, therefore, it is also possible to use cheap solid-state storage media, such as flash memory. Therefore, applying the system and method of this embodiment can greatly reduce the cost of the system under the condition of meeting business requirements.

In addition, it should be noted that although the above embodiment is described by taking the subway system as an example, the information transmission system and method described in this embodiment can also be applied to other systems similar to the subway system, not limited to the subway system. In this case, the second information subsystem is installed on the moving entity, and the first information transmission subsystem is installed at a fixed position. When the mobile entity stops at the position where the first information transmission subsystem is located , the first information transmission subsystem and the second information transmission subsystem establish at least one wireless connection and start data transmission; and when the moving entity leaves the location where the first information transmission subsystem is located, the first information transmission subsystem and the second information transmission subsystem The information transmission subsystem disconnects at least one established wireless connection and stops data transmission.

The present invention also provides a machine-readable storage medium, storing instructions for enabling a machine to execute the information transmission method described herein. Specifically, a system or device equipped with a storage medium may be provided, on which a software program code for realizing the functions of any of the above embodiments is stored, and the computer (or CPU or MPU of the system or device) ) to read and execute the program code stored in the storage medium.

In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, so the program code and the storage medium storing the program code constitute a part of the present invention.

Examples of storage media for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), Tape, non-volatile memory card, and ROM. Alternatively, the program code can be downloaded from a server computer via a communication network.

In addition, it should be clear that not only by executing the program code read by the computer, but also by making the operating system on the computer complete part or all of the actual operations through instructions based on the program code, so as to realize the function of any one of the embodiments.

In addition, it can be understood that the program code read from the storage medium is written into the memory provided in the expansion board inserted into the computer or written into the memory provided in the expansion unit connected to the computer, and then based on the program code The instruction causes the CPU installed on the expansion board or the expansion unit to perform some or all of the actual operations, so as to realize the functions of any one of the above-mentioned embodiments.

Claims (9)

1. a kind of information transmission system, it is characterised in that the information transmission system includes a plurality of first information transmission subsystems And at least one install the second message transmission subsystem ON TRAINS, wherein a plurality of first information transmission subsystems only It is separately mounted at least two stations stopped for the train, each station is provided with least one first information transmission System,

The first information transmission subsystem includes the first control device and at least two access points；

Second message transmission subsystem includes the second control device and at least two wireless clients；

Wherein, at least two access point is configured to rest in the station when the train with least two client When one described access point set up the wireless connection with a client, the first information transmission subsystem passes through institute State wireless connection to the second message transmission subsystem transmitting data information and at least two access point with it is corresponding extremely Few two wireless clients are also configured to disconnect the wireless connection when the train leaves the station；

Wherein, first control device be configured to by the data message be divided into should number of access point message part with Sent to the corresponding wireless client by described access point respectively, second control device is by each client The message part for receiving merges into the data message transmitted by the first information transmission subsystem.

2. the information transmission system according to claim 1, it is characterised in that the information transmission system further includes control Center, is configured to determine that the first information transmission subsystem at each described station needs the data of transmission Information is simultaneously sent to the corresponding first information transmission subsystem.

3. the information transmission system according to claim 2, it is characterised in that the control centre is further configured for according to peace Other cars are adjusted mounted in the feedback information of the first information transmission subsystem at one of place at least two station The first information transmission subsystem data message to be transmitted at the place of station.

4. the information transmission system as claimed in claim 1, it is characterised in that also include：

The first buffer memory device connected one to one with least two access point；And

The second buffer memory device connected one to one with least two client；

Wherein, first and second buffer memory device is used to store described information part.

5. a kind of method of information transfer, for the transmission information between train and its station stopped, wherein the train stops By station described at least two, it is characterised in that the method includes：

When the train stops each described station, in a plurality of first information transmission subsystems and on the train The second message transmission subsystem between set up at least two wireless connections, wherein a plurality of first information transmission subsystems Only it is separately mounted at least two station and each station is provided with least one first information transmission subsystem；

Data message is divided into the message part with the wireless connection respective amount, to meet two or two by described respectively Wireless connection more than individual sends to second message transmission subsystem these message parts；And

Merge into and passed by first information transmission subsystem this described in the described information part that will be received through wireless connection each described The defeated data message；And

At least two wireless connection is disconnected when the train leaves the station.

6. method according to claim 5, it is characterised in that described to be passed from the first information by the wireless connection Defeated subsystem transmits the data message and further includes to second message transmission subsystem：It is determined that being arranged on described in each The first information transmission subsystem at station needs the data message of transmission and sends to corresponding first letter Breath transmission subsystem.

7. the method according to claim 5 or 6, it is characterised in that it is described a plurality of first information transmission subsystems with Setting up at least two wireless connections between the second message transmission subsystem on the train includes：In the described first letter Cease transmission subsystem two or more access points respectively with second message transmission subsystem two or more Wireless client between set up at least two wireless connection, and wherein described disconnect at least two wireless connection Including disconnecting the wireless connection set up between described two or more than two access points and corresponding wireless client.

8. method according to claim 5, it is characterised in that according at a station installed therein this first The feedback information of message transmission subsystem and adjust the data to be transmitted of first information transmission subsystem at other stations Information.

9. method as claimed in claim 5, it is characterised in that also include：

The multiple message parts for being sent to the second message transmission subsystem are buffered in and at least two access point one respectively In multiple first buffer memory devices of one correspondence connection；

Multiple message parts that at least two client is received are buffered in at least two client one by one respectively In multiple second buffer memory devices of correspondence connection.