CN107318127B - Data transmission method, device and system - Google Patents

Data transmission method, device and system Download PDF

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Publication number
CN107318127B
CN107318127B CN201710359098.3A CN201710359098A CN107318127B CN 107318127 B CN107318127 B CN 107318127B CN 201710359098 A CN201710359098 A CN 201710359098A CN 107318127 B CN107318127 B CN 107318127B
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network address
signal
communication device
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communication
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CN107318127A (en
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蔺伟
李长生
孟君
杨丁一
孟宪洪
杨居丰
刘畅
周晓智
窦垭锡
何占元
李志云
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China Shenhua Energy Co Ltd
Shuohuang Railway Development Co Ltd
Signal and Communication Research Institute of CARS
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China Shenhua Energy Co Ltd
Shuohuang Railway Development Co Ltd
Signal and Communication Research Institute of CARS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention relates to the technical field of communication, and discloses a data transmission method, a device and a system, wherein the data transmission method for signal equipment comprises the following steps: generating a first encapsulated data packet comprising a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and transmitting the first encapsulated data packet to a communication device; the communication device can send the first encapsulated data packet to a target communication device corresponding to the target signal device according to the mapping relation between the second network address and the corresponding target communication device stored in the DNS domain name server. The invention can ensure that the signal equipment can carry out high-speed and reliable bidirectional data transmission.

Description

Data transmission method, device and system
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a data transmission method for a signal device, a data transmission apparatus for a signal device, a data transmission method for a communication device, a data transmission apparatus for a communication device, and a data transmission system.
Background
In wheel-rail traffic, in order to ensure the running safety of trains, the trains need to be ensured to run at certain safe intervals. Under the traditional fixed block system, the system can not know the specific position of the train in a subarea, so the starting point and the ending point of train braking are always positioned at the boundary of a certain subarea, the safety interval of train workshops is larger, and the use efficiency of a line is influenced. The mobile block technology is that the vehicle-mounted equipment and the ground equipment, namely the signal equipment are in continuous two-way communication, and the control center can dynamically calculate the mobile block subarea of the train, so that the train can run at a higher speed and at a smaller interval on the basis of ensuring the front and rear safety distance of the train, and the operation efficiency is improved. The train-ground wireless communication is one of the key technologies of the mobile block system, and the train-mounted equipment needs to complete the mobile block service interaction with the ground system through the wireless network.
However, at present, no more perfect data wireless transmission scheme for the railway mobile block system exists.
Disclosure of Invention
In view of the technical problem in the prior art that the data transmission scheme for the mobile blocking system needs to be optimized, the present invention provides a data transmission method for a signal device, which includes: generating a first encapsulated data packet comprising a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and transmitting the first encapsulated data packet to a communication device; the communication device can send the first encapsulated data packet to a target communication device corresponding to the target signal device according to the mapping relation between the second network address and the corresponding target communication device stored in the DNS domain name server.
Preferably, the method further comprises: receiving, from the communication device, a second encapsulated data packet generated by the target signal device, wherein the second encapsulated data packet includes the first network address and the first port number of the signal device, the second network address and the second port number of the target signal device, and second data; and decapsulating the second encapsulated data packet to obtain the second data; the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server, and the communication device can send the second encapsulated data packet to the signal device through a local communication protocol.
Preferably, the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
Preferably, the network address is an Internet Protocol (IP) address.
Correspondingly, the invention also provides a data transmission method for the communication equipment, which comprises the following steps: receiving a first encapsulated data packet from a signal device, wherein the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and sending the first encapsulated data packet to the target communication equipment according to the second network address and the mapping relation between the second network address stored in the DNS domain name server and the corresponding target communication equipment.
Preferably, the method further comprises: receiving, from the target communication device, a second encapsulated data packet generated by the target signal device, the second encapsulated data packet including the first network address and the first port number of the signal device, the second network address and the second port number of the target signal device, and second data; sending the second encapsulated data packet to a signal device corresponding to the communication device through a local network protocol; the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server.
Preferably, the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
Correspondingly, the invention also provides a data transmission device for signal equipment, which comprises: an encapsulating unit, configured to generate a first encapsulated data packet, where the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and a transmitting unit for transmitting the first encapsulated data packet to a communication device; the communication device can send the first encapsulated data packet to a target communication device corresponding to the target signal device according to the mapping relation between the second network address and the corresponding target communication device stored in the DNS domain name server.
Preferably, the apparatus further comprises: a receiving unit configured to receive, from the communication device, the second encapsulated data packet generated by the target signal device; and a decapsulating unit configured to decapsulate the second encapsulated data packet to obtain the second data; wherein the second encapsulated data packet comprises a first network address and a first port number of the signal device, a second network address and a second port number of the target signal device, and second data, and the target communication device is capable of sending the second encapsulated data packet to the communication device corresponding to the signal device according to a mapping relation between the first network address and the corresponding communication device stored in a DNS domain name server, and the communication device is capable of sending the second encapsulated data packet to the signal device through a local communication protocol.
Preferably, the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
Preferably, the network address is an Internet Protocol (IP) address.
Preferably, the signal device is a radio block center, the target signal device is a mobile block vehicle-mounted device, the first data is train control information, and the second data is train state information; or, the signal device is a mobile block vehicle-mounted device, the target signal device is a radio block center, the first data is train state information, and the second data is train control information.
Correspondingly, the invention also provides a data transmission device for the communication equipment, which comprises: a receiving unit, configured to receive a first encapsulated data packet from a signal device, where the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and a sending unit, configured to send the first encapsulated data packet to a target communication device according to the second network address and a mapping relationship between the second network address and the corresponding target communication device, where the mapping relationship is stored in a DNS nameserver.
Preferably, the receiving unit is further configured to: receiving, from the target communication device, a second encapsulated data packet generated by the target signal device; and the sending unit is further configured to: sending the second encapsulated data packet to a signal device corresponding to the communication device through a local network protocol; the second encapsulated data packet comprises a first network address and a first port number of the signal device, a second network address and a second port number of the target signal device and second data, and the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server.
Preferably, the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
In addition, the present invention also provides a data transmission system, which includes: a plurality of signal devices for generating and transmitting a plurality of encapsulated data packets; the DNS domain name server is used for setting and storing the mapping relation between the network address of each signal device in the plurality of signal devices and the corresponding communication device; each communication device in the plurality of communication devices is connected with one signal device in the plurality of signal devices and is used for acquiring the mapping relation from the DNS domain name server and transmitting the encapsulated data packets among the plurality of signal devices according to the mapping relation; wherein the plurality of signal devices comprise the data transmission apparatus for signal devices provided by the present invention, and the plurality of communication devices comprise the data transmission apparatus for communication devices provided by the present invention.
Preferably, at least one of the plurality of signal devices is a mobile block vehicle-mounted device located on the train, and at least another one of the plurality of signal devices is a radio block center located on the ground.
Preferably, the DNS nameserver is a DNS nameserver of a TD-LTE network, and the communication device is a TD-LTE communication device.
Preferably, the communication device comprises a plurality of data transmission devices for the communication device, and the data transmission devices for the communication device operate in a multi-machine redundancy mode or a master-slave redundancy mode.
By adopting the data transmission method and device for the signal equipment, the data transmission method and device for the communication equipment and the data transmission system provided by the invention, the signal equipment can carry out high-speed and reliable bidirectional data transmission.
Particularly, the data transmission scheme provided by the invention provides a technical basis for realizing the mobile block, and the data transmission scheme is applied to a railway mobile block system, so that the high-speed and reliable intercommunication of services between signal equipment on a train and signal equipment on the ground can be realized, and the safety and high efficiency of train running are ensured.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic block diagram of an exemplary data transmission system in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary data transmission arrangement for a signaling device, according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of an exemplary data transmission arrangement for a signaling device, according to one embodiment of the present invention;
FIG. 4 is a schematic diagram of an exemplary data transmission arrangement for a communication device, according to one embodiment of the present invention;
5-6 are schematic diagrams of an exemplary data interaction process according to one embodiment of the invention;
FIG. 7 is a schematic block diagram of an exemplary data transmission system in accordance with one embodiment of the present invention;
FIG. 8 is a schematic block diagram of an exemplary data transmission system in accordance with one embodiment of the present invention;
FIG. 9 is a flow chart illustrating a data transmission method for a signaling device according to one embodiment of the present invention; and
fig. 10 is a flowchart illustrating a data transmission method for a communication device according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In order to meet the high-speed and reliable requirements of the mobile blocking technology on data transmission, the invention provides a perfect data transmission means. The idea of the invention will be described in more detail below in a number of embodiments:
example 1
Fig. 1 is a schematic structural diagram of an example data transmission system according to an embodiment of the present invention, and as shown in fig. 1, the system may include: a plurality of signal devices for generating and transmitting a plurality of encapsulated data packets; the DNS domain name server is used for setting and storing the mapping relation between the network address of each signal device in the plurality of signal devices and the corresponding communication device; and each communication device in the plurality of communication devices is connected with one signal device in the plurality of signal devices, and is used for acquiring the mapping relation from the DNS domain name server and transmitting the encapsulated data packets among the plurality of signal devices according to the mapping relation.
Specifically, for example, the plurality of signal devices may be the signal device a and the target signal device D shown in fig. 1, and the plurality of signal devices may be distinguished using the signal device a and the target signal device D due to an interaction process involving data between devices in the system, where the signal device and the target signal device may be any suitable signal device used in a railway system, such as a ground signal device and a vehicle signal device, where the signal device a may generate and transmit the first encapsulated data packet and the target signal device D may generate and transmit the second encapsulated data packet.
The DNS nameserver may set and store a mapping relationship between a network address of each of the plurality of signal devices and a corresponding communication device, may be located in a wireless network, and may be any suitable wireless network, such as a wireless network like a long term evolution LTE network. When data interaction is performed, the communication device may query the mapping relationship in the DNS nameserver, and implement data interaction through the mapping relationship.
For example, the plurality of communication devices may be the communication device B and the target communication device C described in fig. 1, and the plurality of communication devices may be the communication device B and the target communication device C, which are distinguished by the interactive process involving data between devices in the system, wherein the communication device B and the target communication device C may be any suitable wireless communication device used in railway systems, such as TD-LTE communication device, etc., each of the plurality of communication devices is connected with one of the plurality of signal devices, for example, as shown in fig. 1, signal device a is connected with communication device B, and target communication device C is connected with target communication device D, and is configured to acquire the mapping relationship from the DNS server and transmit the plurality of encapsulated data packets between the plurality of signal devices (e.g., between signal device a and target communication device D) according to the mapping relationship, such as a first encapsulated data packet and a second encapsulated data packet.
It should be understood that the number of signal devices and communication devices shown in fig. 1 is only an illustrative and non-limiting example, and those skilled in the art may configure N signal devices and N communication devices according to practical situations (e.g. railway design requirements), that is, one signal device corresponds to one communication device, so as to transmit N encapsulated data packets; or N signal devices and M communication devices, that is, one communication device may correspond to a plurality of signal devices, where N and M are positive integers greater than or equal to 1, and N ≧ M, which are not limited by the present invention.
In order to realize the interaction between the signal devices, wherein the plurality of signal devices can comprise the data transmission device for the signal devices provided by the invention, and the plurality of communication devices comprise the data transmission device for the communication devices provided by the invention, the aim of the invention is realized.
Considering that a plurality of existing signal devices and communication devices exist in a railway system, the data transmission device for the signal devices and the data transmission device for the communication devices are respectively provided to achieve the purpose of the invention, and the data transmission device can be integrated in the existing signal devices and the communication devices in a hardware form or updated and configured in a software form in practical use, so that the waste of resources is avoided while the functions of the invention are achieved. Alternatively, a new type of signal device and communication device having the above-described apparatus may be configured to meet the actual needs.
By adopting the embodiment 1, on the premise of ensuring the mutual isolation of the signal network and the railway communication network, the main network configuration and the topological structure of the railway communication network are not changed, the data can be transmitted in two directions at high speed and reliably between signal devices through the railway communication network, and the safety and the high efficiency of train running are ensured.
Examples of the data transmission apparatus 100 for a signal device and the data transmission apparatus 200 for a communication device will be provided in the following embodiments, respectively, to explain the idea of the present invention in more detail.
Example 2
Fig. 2 is a schematic structural diagram of an exemplary data transmission apparatus for a signal device according to an embodiment of the present invention, and as shown in fig. 2, the apparatus may include: an encapsulating unit 11, configured to generate a first encapsulated data packet, where the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and a sending unit 12 for sending the first encapsulated data packet to the communication device, for example using a local network protocol, for example a UDP protocol.
The first encapsulated data packet may include a first network address of the signaling device a, such as an Internet Protocol (IP) address and a first port number (e.g., the IP address of the signaling device a and its port number as shown in fig. 1), a second network address of the target signaling device D, such as an IP address and a second port number (i.e., the IP address of the target signaling device and its port number), and first data, which may be an application data packet of the signaling device a. I.e. in the first encapsulated data packet the first network address/port number of the signalling device a is the source address/port number and the second network address/port number of the target signalling device D is the target address/port number.
Then, the communication device B corresponding to the signaling device a can send the first encapsulated data packet to the target communication device C corresponding to the target signaling device D according to the mapping relationship between the second network address (i.e., the target address) stored in the DNS nameserver and the corresponding target communication device C.
Example 3
Fig. 3 is a schematic structural diagram of an exemplary data transmission apparatus 100 for a signal device according to an embodiment of the present invention, and as shown in fig. 3, in this embodiment 3, the difference from embodiment 2 is that the apparatus may further include, in addition to the encapsulation unit 11 and the transmission unit 12: a receiving unit 13 configured to receive, from the communication device B, the second encapsulated data packet generated by the target signal device D; and a decapsulating unit 14, configured to decapsulate the second encapsulated data packet to obtain the second data.
Wherein the second encapsulated data packet may include the first network address and the first port number of the signaling device a, such as the IP address and the first port number (e.g., the IP address and the port number of the signaling device a shown in fig. 1), the second network address and the second port number of the target signaling device D, such as the IP address and the second port number (e.g., the IP address and the port number of the signaling device a shown in fig. 1), and the second data, which may be the application data packet of the target signaling device B. However, unlike the first encapsulated data packet, where the second network address/port number of destination signaling device D is the source address/port number and the first network address/port number of signaling device A is the destination address/port number.
Wherein, the target communication device C is capable of sending the second encapsulated data packet to the communication device B corresponding to the signal device a according to the mapping relationship between the first network address (i.e. the target address) stored in the DNS nameserver and the corresponding communication device B, and the communication device B is capable of sending the second encapsulated data packet to the signal device a through a local communication protocol.
It should be understood that, although the description is made on the side of the signal device a in embodiments 2-3, actually, the target signal device D may also perform the same configuration (i.e. a process of receiving and decapsulating the first encapsulated data packet from the signal device a, and a process of generating and transmitting the second encapsulated data packet that is expected to be transmitted to the signal device a), which is not described herein again, so that data interaction between signal devices may be implemented.
Example 4
Fig. 4 is a schematic structural diagram of a data transmission apparatus 200 for a communication device according to an embodiment of the present invention, and as shown in fig. 4, the apparatus may include: a receiving unit 21, configured to receive a first encapsulated data packet from the signal device a, wherein the first encapsulated data packet may include a first network address (IP address) and a first port number of the signal device a, a second network address (IP address) and a second port number of the target signal device D, and first data, as described in embodiments 2-3 above; a sending unit 22, configured to send the first encapsulated data packet to a target communication device C according to the second network address and a mapping relationship between the second network address stored in the DNS nameserver and the corresponding target communication device C.
Preferably, the receiving unit 21 is further configured to: receiving a second encapsulated data packet generated by the target signal device D from the target communication device C; and the sending unit 22 is further configured to: the second encapsulated data packet is sent to signal device a corresponding to the communication device B via a local network protocol (e.g., UDP protocol).
Wherein the second encapsulated data packet may include a first network address (IP address) and a first port number of the signal device a, a second network address (IP address) and a second port number of the target signal device D, and second data, and the target communication device C may be capable of sending the second encapsulated data packet to the communication device B corresponding to the signal device a according to a mapping relationship between the first network address and the corresponding communication device B stored in a DNS nameserver.
Specifically, in order to realize the interaction between the above-described communication devices of the present invention, mapping relationships between a plurality of signal devices and a plurality of communication devices may be set and stored in a DNS nameserver in a wireless network of the communication devices in advance. For example, the mapping relationship between the first network address and the corresponding communication device may include: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device may include: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment. Specific configuration procedures are given in tables 1-3:
table 1 signalling device IP address allocation table
Serial number Device name IP address
1 Signal device A 10.0.0.12
2 Target signal device D 10.0.0.24
Table 2 communication equipment IP address allocation table
Serial number Device name IP address
1 Communication equipment B (connected with signal equipment A) 10.10.0.115
2 Communication equipment C (connected with target signal equipment D) 10.10.0.240
Table 3 DNS nameserver configuration
Serial number Domain name IP address
1 TEST.10000012.TEST 10.10.0.115
2 TEST.10000024.TEST 10.10.0.240
As shown in tables 1-3, the mapping relationship between the first network address 10.0.0.12 of the signal device a and the corresponding communication device may include: the network address pointed to by the first domain name test.10000012.test of the first network address encoding 10.0.0.12 is the third network address 10.10.0.115 of the communication device B; and the mapping relationship between the second network address and the corresponding target communication device may include: a second domain name test.10000024.test encoded with the second network address 10.0.0.24 points to a network address that is the fourth network address 10.10.0.240 of the target communication device.
Because the address conversion is realized by the DNS, when the configuration of the data transmission system is changed and expanded, the corresponding change is only needed in the DNS, and the operation can be performed by a network administrator, so that the maintenance cost is low.
It should be understood that the IP address assignments in tables 1-3 above are merely exemplary and non-limiting examples, and that other IP address alternatives derived by those skilled in the art from the descriptions in tables 1-3 above are within the scope of the present invention.
Example 5
Fig. 5 to 6 are schematic diagrams of an exemplary data interaction process according to an embodiment of the present invention, and the interaction process between the signal devices in examples 1 to 4 is described in example 5:
because the signal network and the communication network are isolated from each other, the signal devices (such as vehicle-mounted signal devices and ground signal devices) in different wireless network access areas cannot be directly addressed, the signal device A communicates with the local communication device B, and the signal network addresses and the port numbers of the signal device A and the target signal device D are used, and the first data (e.g., application data packet) is sent to the local communication device B, the local communication device B may complete addressing to the target communication device C according to the mapping relationship (i.e., the domain name correspondence of tables 1-3) between the target signal device D (indicated by the signal network address of the target device) and the target communication device C connected thereto, and the signal network addresses and port numbers of the signal equipment A and the target signal equipment D and the application data message are packaged and sent to the target communication equipment C. The target communication device D that receives the data packet may fill in the packet header of the UDP protocol according to the signal network address of the target signal device D described in the data packet, and send the signal network address and the port number of the signal device a and the target signal device D in the data packet and the application data packet to the target signal device D through the local signal network, where the whole communication process is as shown in fig. 5.
In particular, FIG. 6 is a schematic diagram of an exemplary data interaction process in accordance with an embodiment of the present invention, wherein solid lines represent entity structures and signal flows and dashed lines represent entity internal operations. As shown in fig. 6, the interaction process between the signal device a and the target signal device B is as follows:
first, on the side of the signal device a, as described above, a first encapsulated data packet including the IP addresses and port numbers of the signal device a, the target signal device D, and first data (e.g., an application data packet) is generated (step 1001). Specifically, to implement the above communication mechanism, a signaling network address layer is encapsulated outside the first data application layer, and the layer describes the IP address and port of the signaling device and the IP address and port number information of the target signaling device, as shown in table 4.
Table 4 signal network address layer header format
Figure BDA0001299878670000141
The red network and the blue network represent the main and standby redundant dual networks of the signal network, and for the condition of a single signal network, only the red network or the blue network in the table can be configured.
Thereafter, the first encapsulated data packet is sent to communication device B using the local network protocol (e.g., UDP protocol) described above (step 1002). Next, the communication device B addresses the target communication device C using the mapping relationship (for example, described in embodiment 4) of the target signaling device D and the target communication device C in the DNS nameserver (step 1003) and transmits the first encapsulated data packet to the target communication device C (step 1004). Thereafter, the target communication device C transmits the first encapsulated data packet to the target signal device D using the UDP protocol (e.g., according to the second network address of the target signal device in the first encapsulated data packet) (step 1005), as described above, and the target signal device D then decapsulates the first encapsulated data packet to thereby obtain the first data (step 1006), completing the data transmission from the signal device a side to the target signal device D side.
Similarly, on the side of the target signal device D, as described above, a second encapsulated data packet including the IP address and the port number of the signal device a and the target signal device D and the second data (application data packet) is generated (step 2001), and the specific encapsulation is described above and is not described herein again. Thereafter, the second encapsulated data packet is transmitted to the target communication device C using the above-described local network protocol (e.g., UDP protocol) (step 2002). Next, the target communication device D addresses the target communication device B using the mapping relationship of the signaling device a and the communication device B in the DNS nameserver (e.g., as described in embodiment 4) (step 2003) and sends a second encapsulated data packet to the communication device B (step 2004). Thereafter, communication device B transmits the second encapsulated data packet to signal device a using the UDP protocol (e.g., based on the first network address of the signal device in the second encapsulated data packet) as described above (step 2005), after which signal device a decapsulates the second encapsulated data packet to obtain second data (step 2006), completing the data transfer from the target signal device D side to the signal device a side.
With such embodiment 5, bidirectional data transmission between signal devices can be performed reliably at high speed. Because the communication between the signal device and the communication device is performed in the manner of address mapping forwarding, the data is transmitted by the signal device through the wireless communication network on the premise of not changing the main network configuration and topology structure of the wireless communication network, and meanwhile, in embodiment 5, the device in the signal network cannot communicate with the device in the communication network, and the signal network and the communication network still keep an isolated state, thereby ensuring the security of the signal network and the communication network.
Example 6
Fig. 7 to 8 are schematic structural diagrams of an example data transmission system according to an embodiment of the present invention, and as shown in fig. 7, in this example 7, an example of applying the data transmission system of the present invention to a railway moving block system is shown. In the mobile blocking system, at least one of the plurality of signal devices may be a mobile blocking onboard device located on a train, and at least another one of the plurality of signal devices may be a radio block center located on the ground.
Applied to the signal device a and the target signal device D including the data transmission apparatus for a signal device in embodiments 2 to 5, when the signal device is a radio block center and the target signal device is a mobile block vehicle-mounted device, the first data may be train control information, and the second data may be train state information; or, when the signal device is a mobile block vehicle-mounted device and the target signal device is a radio block center, the first data may be train state information, and the second data may be train control information.
Preferably, the TD-LTE is the most advanced technology system in the field of mobile communication, and is also the mainstream of the fourth-generation broadband mobile communication technology, and has the technical characteristics of large data transmission throughput, small delay, lossless handover and the like, and can ensure the real-time property, continuity and reliability of train control data transmission between vehicles and places, so the DNS nameserver can be a DNS nameserver of a TD-LTE network, and the communication device can be a TD-LTE communication device.
For example, a train control information wireless transmission system is constructed by arranging TD-LTE communication equipment (such as 'communication interface unit') aiming at the ground on a railway line or a railway dispatching command center, installing TD-LTE communication equipment (such as 'vehicle-mounted communication equipment') aiming at a train on the train, and realizing high-speed and reliable transmission of train control information.
For the configuration of the communication equipment, it may include a plurality of the data transmission devices 200 for the communication equipment, and the data transmission devices 200 for the communication equipment are operated in a multi-machine redundancy mode (i.e. a plurality of devices work simultaneously) or a master-slave redundancy mode (i.e. one device works and the other devices are standby) to ensure reliable transmission of train control information and ensure driving safety of a train.
It should be understood that the number of the signal devices and the communication devices shown in fig. 7 is only an illustrative and non-limiting example, and those skilled in the art may configure N signal devices and N communication devices according to practical situations (e.g. railway design requirements), that is, one signal device corresponds to one communication device, or N signal devices and M communication devices, that is, one communication device may correspond to multiple signal devices, where N and M are positive integers greater than or equal to 1, and N ≧ M, and the present invention does not limit these numbers, for example, as shown in fig. 8, one TD-LTE communication device a may correspond to multiple radio block centers a, … … N; one TD-LTE communication device b may correspond to a plurality of mobile blocking car-mounted devices a, … … n.
More preferably, other functions of the communication device may be configured for the ground and the vehicle-mounted signal device, for example, for the ground communication device, i.e. the communication interface unit, it may implement functions of address conversion, column control information forwarding, storage, and the like between the signal network and the communication network. The communication interface unit can comprise a data transmission device and a storage unit, wherein the data transmission device is used for the communication equipment, the data transmission device is used for converting different addressing spaces of a mobile blocking signal network and a TD-LTE communication network by using a domain name server, transmitting the column control information between the mobile blocking ground equipment and the vehicle-mounted communication equipment, and transmitting all receiving and transmitting data copies to the storage unit. The storage unit can receive data sent by the data transmission device for the communication equipment and store all the data in the database for the maintenance terminal to call and analyze.
For the vehicle-mounted communication equipment, namely the vehicle-mounted communication equipment can also comprise a power supply unit besides a data transmission device for the communication equipment, wherein the power supply unit is arranged at one end of the locomotive and provides an external interface; meanwhile, the conversion of different addressing spaces of a mobile block signal network and a TD-LTE communication network by using a domain name server is realized, and the communication function of the TD-LTE wireless network is realized by forwarding the train control information between the mobile block vehicle-mounted equipment and the communication interface unit.
By adopting the embodiment 6, the communication between the signal device and the communication device is performed in the address mapping forwarding manner, so that the transmission of the train control information by the signal device through the TD-LTE communication network is realized on the premise of not changing the configuration and topology structure of the main network of the TD-LTE communication network, the deployment difficulty of the mobile block system and the potential influence of the mobile block system on the TD-LTE communication network are reduced, meanwhile, the device in the signal network and the device in the communication network cannot communicate, the signal network and the communication network still keep an isolated state, and the safety of the signal network and the communication network is ensured.
And the mapping relation between the signal equipment and the communication equipment is realized by using a domain name server in the TD-LTE network, the address of the signal equipment in the signal network is coded into a domain name in the TD-LTE domain name server according to a specific format, and the address pointed by the domain name is set as the address of the communication equipment directly connected with the signal equipment. Because the address conversion is realized by the domain name server, when the configuration of the mobile block system is changed and expanded, the invention only needs to change correspondingly in the domain name server, and the operation can be operated only by a TD-LTE network administrator, so the maintenance cost is lower.
It should be understood that a person skilled in the art can select any one of the various embodiments 1-6 or select a combination of the various embodiments to configure the data transmission device for the signal equipment, the data transmission device for the communication equipment and the data transmission system according to the disclosure of the present invention, and other alternative embodiments also fall into the scope of the present invention.
Fig. 9 is a flowchart illustrating a data transmission method for a signal device according to an embodiment of the present invention, and as shown in fig. 9, the method may include the steps of:
step S11, generating a first encapsulated data packet, where the first encapsulated data packet includes the first network address and the first port number of the signal device, the second network address and the second port number of the target signal device, and the first data; and
step S12, sending the first encapsulated data packet to a communication device;
the communication device can send the first encapsulated data packet to a target communication device corresponding to the target signal device according to the mapping relation between the second network address and the corresponding target communication device stored in the DNS domain name server.
Preferably, the method further comprises: receiving, from the communication device, a second encapsulated data packet generated by the target signal device, wherein the second encapsulated data packet includes the first network address and the first port number of the signal device, the second network address and the second port number of the target signal device, and second data; and decapsulating the second encapsulated data packet to obtain the second data; the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server, and the communication device can send the second encapsulated data packet to the signal device through a local communication protocol.
Preferably, the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
Preferably the network address is an Internet Protocol (IP) address.
Fig. 10 is a flowchart illustrating a data transmission method for a communication device according to an embodiment of the present invention, and as shown in fig. 10, the method may include the steps of:
step S21, receiving a first encapsulated data packet from the signal device, wherein the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of the target signal device, and first data; and
step S22, sending the first encapsulated data packet to the target communication device according to the second network address and the mapping relationship between the second network address stored in the DNS nameserver and the corresponding target communication device.
Preferably, the method further comprises: receiving, from the target communication device, a second encapsulated data packet generated by the target signal device, the second encapsulated data packet including the first network address and the first port number of the signal device, the second network address and the second port number of the target signal device, and second data; sending the second encapsulated data packet to a signal device corresponding to the communication device through a local network protocol; the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server.
Preferably, the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
It should be understood that, the above-mentioned data transmission method for a signal device and the data transmission method for a communication device have been described in detail in the embodiments illustrating the data transmission apparatus for a signal device, the data transmission apparatus for a communication device, and the data transmission system (as described above), and are not described herein again.
The data transmission device and method for the signal equipment, the data transmission device and method for the communication equipment and the data transmission system have the following advantages that:
(1) the signal network/communication network address conversion mechanism is adopted, the main network configuration and the topological structure of the railway communication network are not changed on the premise of ensuring the mutual isolation of the signal network and the railway communication network, and the rapid and reliable bidirectional transmission of the mobile block train control information between signal equipment through the railway communication network is realized;
(2) the mobile block train control information wireless transmission system is convenient to deploy and maintain. The mobile block train control information wireless transmission system adopted by the invention can realize the transmission of mobile block data through the TD-LTE network only by correspondingly configuring the domain name server of the railway TD-LTE communication network except that the train is provided with the vehicle-mounted communication equipment and the communication interface unit is arranged on the ground, and does not need to change other configurations and topological structures of the TD-LTE communication network, thereby being convenient for deployment; meanwhile, when the configuration of the mobile block system is changed or needs to be expanded, the method adopted by the invention can complete the configuration change or the expansion only by modifying the configuration in the domain name server of the TD-LTE communication network, the operation can be completed by a TD-LTE network administrator, and the maintenance cost is low;
(3) the system adopted by the invention can monitor and store the mobile block column control data while realizing high-speed and reliable transmission of the mobile block data among the train-ground equipment, and the stored data can provide data support for tracing problems in the future and optimizing and upgrading the system.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (18)

1. A data transmission method for a signal device, wherein the method is applied to a mobile block system of wheel-track traffic, and the method comprises the following steps:
generating a first encapsulated data packet comprising a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and
transmitting the first encapsulated data packet to a communication device;
the communication equipment can send the first encapsulated data packet to target communication equipment corresponding to the target signal equipment according to the mapping relation between the second network address and the corresponding target communication equipment, wherein the mapping relation is stored in a DNS (domain name server);
the signal equipment is a wireless block center, and the target signal equipment is mobile block vehicle-mounted equipment; or, the signal device is a mobile block vehicle-mounted device, and the target signal device is a wireless block center.
2. The data transmission method for a signaling device according to claim 1, characterized in that the method further comprises:
receiving, from the communication device, a second encapsulated data packet generated by the target signal device, wherein the second encapsulated data packet includes the first network address and the first port number of the signal device, the second network address and the second port number of the target signal device, and second data; and
decapsulating the second encapsulated data packet to obtain the second data;
the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server, and the communication device can send the second encapsulated data packet to the signal device through a local communication protocol.
3. The data transmission method for a signaling device according to claim 2, wherein the mapping relationship between the first network address and the corresponding communication device comprises: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
4. The data transmission method for a signaling device of claim 3 wherein said network address is an Internet Protocol (IP) address.
5. A data transmission method for a communication device, wherein the method is applied to a mobile block system of wheel-track traffic, and the method comprises the following steps:
receiving a first encapsulated data packet from a signal device, wherein the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and
sending the first encapsulated data packet to a target communication device according to the second network address and the mapping relation between the second network address and the corresponding target communication device, wherein the mapping relation is stored in a DNS (domain name server);
the signal equipment is a wireless block center, and the target signal equipment is mobile block vehicle-mounted equipment; or, the signal device is a mobile block vehicle-mounted device, and the target signal device is a wireless block center.
6. The data transmission method for a communication device according to claim 5, further comprising:
receiving, from the target communication device, a second encapsulated data packet generated by the target signal device, the second encapsulated data packet including the first network address and the first port number of the signal device, the second network address and the second port number of the target signal device, and second data;
sending the second encapsulated data packet to a signal device corresponding to the communication device through a local network protocol;
the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server.
7. The data transmission method for a communication device according to claim 6, wherein the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
8. A data transmission device for signalling equipment, characterized in that it is applied to a mobile block system for wheel-track traffic, the device comprising:
an encapsulating unit, configured to generate a first encapsulated data packet, where the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and
a sending unit, configured to send the first encapsulated data packet to a communication device;
the communication equipment can send the first encapsulated data packet to target communication equipment corresponding to the target signal equipment according to the mapping relation between the second network address and the corresponding target communication equipment, wherein the mapping relation is stored in a DNS (domain name server);
the signal equipment is a wireless block center, and the target signal equipment is mobile block vehicle-mounted equipment; or, the signal device is a mobile block vehicle-mounted device, and the target signal device is a wireless block center.
9. The data transmission apparatus for a signaling device according to claim 8, characterized in that the apparatus further comprises:
a receiving unit configured to receive, from the communication device, the second encapsulated data packet generated by the target signal device; and
a decapsulating unit, configured to decapsulate the second encapsulated data packet to obtain second data;
wherein the second encapsulated data packet comprises a first network address and a first port number of the signal device, a second network address and a second port number of the target signal device, and second data, and the target communication device is capable of sending the second encapsulated data packet to the communication device corresponding to the signal device according to a mapping relation between the first network address and the corresponding communication device stored in a DNS domain name server, and the communication device is capable of sending the second encapsulated data packet to the signal device through a local communication protocol.
10. The data transmission apparatus for signaling device according to claim 9, wherein the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
11. The data transmission apparatus for a signaling device of claim 10 wherein said network address is an Internet Protocol (IP) address.
12. The data transmission apparatus for a signal device according to claim 11, wherein when the signal device is a radio block center and the target signal device is a mobile block vehicle-mounted device, the first data is train control information, and the second data is train state information; and when the signal equipment is mobile block vehicle-mounted equipment and the target signal equipment is a wireless block center, the first data is train state information and the second data is train control information.
13. A data transmission device for communication equipment, which is applied to a mobile block system of wheel-track traffic, the device comprising:
a receiving unit, configured to receive a first encapsulated data packet from a signal device, where the first encapsulated data packet includes a first network address and a first port number of the signal device, a second network address and a second port number of a target signal device, and first data; and
a sending unit, configured to send the first encapsulated data packet to a target communication device according to the second network address and a mapping relationship between the second network address and the corresponding target communication device, where the mapping relationship is stored in a DNS nameserver;
the signal equipment is a wireless block center, and the target signal equipment is mobile block vehicle-mounted equipment; or, the signal device is a mobile block vehicle-mounted device, and the target signal device is a wireless block center.
14. The data transmission apparatus for a communication device according to claim 13, wherein the receiving unit is further configured to: receiving, from the target communication device, a second encapsulated data packet generated by the target signal device; and
the sending unit is further configured to: sending the second encapsulated data packet to a signal device corresponding to the communication device through a local network protocol;
the second encapsulated data packet comprises a first network address and a first port number of the signal device, a second network address and a second port number of the target signal device and second data, and the target communication device can send the second encapsulated data packet to the communication device corresponding to the signal device according to the mapping relation between the first network address and the corresponding communication device stored in the DNS domain name server.
15. The data transmission apparatus for communication devices according to claim 14, wherein the mapping relationship between the first network address and the corresponding communication device includes: the network address pointed by the first domain name coded by the first network address is a third network address of the communication equipment; and the mapping relationship between the second network address and the corresponding target communication device comprises: and the network address pointed by the second domain name coded by the second network address is the fourth network address of the target communication equipment.
16. A data transmission system, comprising:
a plurality of signal devices for generating and transmitting a plurality of encapsulated data packets;
the DNS domain name server is used for setting and storing the mapping relation between the network address of each signal device in the plurality of signal devices and the corresponding communication device;
the communication equipment is connected with one of the signal equipment, and is used for acquiring the mapping relation from the DNS domain name server and transmitting the encapsulated data packets among the signal equipment according to the mapping relation;
wherein the plurality of signal devices comprises the data transmission arrangement for a signal device according to any of claims 8-12, the plurality of communication devices comprises the data transmission arrangement for a communication device according to any of claims 13-15;
at least one of the plurality of signal devices is a mobile block vehicle-mounted device located on the train, and at least another one of the plurality of signal devices is a wireless block center located on the ground.
17. The system of claim 16, wherein the DNS nameserver is a DNS nameserver of a TD-LTE network and the communication device is a TD-LTE communication device.
18. The system according to claim 16, wherein said communication device comprises a plurality of said data transmission devices for communication devices, and said plurality of data transmission devices for communication devices operate with multi-machine redundancy or master-slave redundancy.
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