CN109995661B - DTN data transmission method, device and system for air-to-air communication network - Google Patents

DTN data transmission method, device and system for air-to-air communication network Download PDF

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CN109995661B
CN109995661B CN201910191915.8A CN201910191915A CN109995661B CN 109995661 B CN109995661 B CN 109995661B CN 201910191915 A CN201910191915 A CN 201910191915A CN 109995661 B CN109995661 B CN 109995661B
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data block
node
gateway
bundle
data
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CN109995661A (en
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张涛
张咏
朱慧娟
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Beihang University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18502—Airborne stations
    • H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/74—Address processing for routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/183—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source
    • H04N7/185—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a single remote source from a mobile camera, e.g. for remote control

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention provides a method, a device and a system for DTN data transmission of a temporary air communication network, wherein the method comprises the following steps: the method comprises the steps that a first gateway receives train operation data collected by an unmanned aerial vehicle camera; the first gateway encapsulates the train operation data into a Bundle data block through a Bundle protocol according to the train operation data and the destination IP address and sends the Bundle data block to the first forwarding node; the first forwarding node receives the Bundle data block, and sends the Bundle data block to a second forwarding node or a second gateway according to destination node EID information in the Bundle data block and node EID information of the second forwarding node; and the second gateway receives the Bundle data block and sends the train operation data to the terminal according to the destination IP address and the port number in the Bundle data block. The stability of high dynamic network data link transmission is realized, and the continuous transmission of data can be more accurately carried out.

Description

DTN data transmission method, device and system for air-to-air communication network
Technical Field
The invention relates to the technical field of temporary air train ground networks, in particular to a method, a device and a system for DTN data transmission of a temporary air communication network.
Background
With the development of scientific technology, a near space area, an unmanned aerial vehicle and other modes break through a transmission mode of rail transit information based on ground base station communication, and a rail transit special information guarantee system comprising the unmanned aerial vehicle, an aerostat, a train, a ground terminal and a mobile terminal is established.
In the prior art, an unmanned aerial vehicle and a train node are all high-dynamic nodes, so that the network topology is time-varying, and the subnets are heterogeneous in the aspects of information protocol format, communication equipment interface, user address space, network transmission capacity and the like, so that the traditional network cannot meet the communication requirement of the empty vehicle ground network.
However, even if the data transmission end knows the IP address of the terminal, node information of the terminal connected to the DTN network cannot be obtained due to time-varying network topology, or when a plurality of terminals are connected under one node of the DTN network, EID information of the node cannot uniquely correspond to one terminal IP address, so it is necessary to obtain the correspondence between the terminal IP address and the connected DTN node, and retain the destination IP address and the destination port number information in the data transmitted by the DTN network.
Disclosure of Invention
The invention provides a method, a device and a system for DTN data transmission of a temporary air communication network, which realize the stability of high dynamic network data link transmission, can more accurately carry out continuous data transmission and simultaneously improve the safe operation and comprehensive guarantee capability of rail transit.
In a first aspect, a method for DTN data transmission in a temporary air communication network, applied in a network system including an unmanned aerial vehicle, a first gateway, at least one forwarding node, and a second gateway, includes: the method comprises the steps that a first gateway receives train operation data collected by an unmanned aerial vehicle camera; the first gateway encapsulates the train operation data into a Bundle data block through a Bundle protocol according to the train operation data and the destination IP address, and sends the Bundle data block to a first forwarding node; the first forwarding node receives the Bundle data block, and sends the Bundle data block to a second forwarding node or a second gateway according to destination node EID information in the Bundle data block and node EID information of the second forwarding node, wherein the node EID information of the forwarding node and the destination node is stored in a mapping table obtained in advance through broadcasting; and the second gateway receives the Bundle data block and sends the train operation data to a terminal according to a destination IP address in the Bundle data block.
In one possible design, the first gateway encapsulates the train operation data into Bundle data blocks according to the train operation data and a destination IP address and a destination port number by using a Bundle protocol, and includes: the first gateway adds a first control tail to the train operation data at an IP layer to form first data and uploads the first data to a TCP layer; the first control tail comprises a source IP address and a destination IP address of the unmanned aerial vehicle in the IP message control head;
in a TCP layer, adding a second control tail to the first data to form second data, and uploading the second data to a BP layer, wherein the second control tail comprises a source port and a destination port in a TCP message control head;
in a BP layer, storing the first control tail and the second control tail into an expansion block of the Bundle data block;
and in a BP layer, according to the destination IP address and the mapping table, inquiring and obtaining destination node EID information corresponding to the destination IP address, storing the EID information of a source node and the destination node EID information in a control head of a Bundle data block, and encapsulating to finish the Bundle data block.
In one possible design, sending the Bundle data block to a second forwarding node or a second gateway according to destination node EID information in the Bundle data block and node EID information of the second forwarding node includes:
according to a preset routing algorithm rule and the destination node EID information in the Bundle data block, obtaining the EID information of a second forwarding node or the node EID information of a second gateway; sending the Bundle data block to a second forwarding node or a second gateway according to the EID information of the second forwarding node or the node EID information of the second gateway; wherein the destination node EID information comprises EID information of the DTN node to which the ground terminal is connected.
In one possible design, the sending the train operation data block to a terminal according to a destination IP address in the Bundle data block includes:
the second gateway decapsulates the Bundle data block in a BP layer, and acquires a source port, an IP address of the unmanned aerial vehicle, the destination IP address and a destination port from an expansion block of the Bundle data block;
in a TCP layer, adding the source port and the destination port as a first control head to the train operation data to form third data, and sending the third data to an IP layer;
and in an IP layer, adding the IP address and the destination IP address of the unmanned aerial vehicle as a second control head into the third data to form fourth data, and sending the fourth data to a terminal.
In one possible design, the mapping table of the forwarding node stores IP addresses, node EID information, and serial numbers.
In a possible design, the second gateway broadcasts a BP data block encapsulated in a BP layer in a flooding manner, where the BP data block includes an IP address and corresponding node EID information;
the second gateway receives an ACK (acknowledgement) message returned by the forwarding node; and if the ACK confirmation message returned by the forwarding node is not received within the preset time length, retransmitting the BP data block.
In a possible design, the forwarding node receives the BP data block, discards the received BP data block if the BP data block already exists in the mapping table of the forwarding node, and returns an ACK acknowledgement message to the second gateway;
if the BP data block does not exist in the mapping table of the forwarding node, the BP data block is stored in the mapping table of the forwarding node, and is sent to other gateways in a network system, and an ACK (acknowledgement) message is returned to the second gateway;
and if the sequence number in the BP data block is different from the sequence number in the mapping table of the forwarding node, updating the BP data block into the mapping table of the forwarding node, sending the BP data block to other gateways in a network system, and returning an ACK (acknowledgement) message to the second gateway.
In a second aspect, an apparatus for DTN data transmission of a temporary air communication network provided in an embodiment of the present invention is applied in a network system including an unmanned aerial vehicle, a first gateway, at least one forwarding node, and a second gateway, and the apparatus includes: the first gateway is used for receiving train operation data acquired by the unmanned aerial vehicle camera; the first gateway is also used for encapsulating the train operation data into a Bundle data block through a Bundle protocol according to the train operation data and the destination IP address and sending the Bundle data block to a first forwarding node; the first forwarding node is configured to receive the Bundle data block, and send the Bundle data block to a second forwarding node or a second gateway according to destination node EID information in the Bundle data block and node EID information of the second forwarding node, where the node EID information of the forwarding node and the destination node is stored in a mapping table obtained in advance through broadcasting; and the second gateway is used for receiving the Bundle data block and sending the train operation data to a terminal according to the destination IP address and the port number in the Bundle data block.
In one possible design, the first gateway encapsulates the train operation data into Bundle data blocks according to the train operation data and a destination IP address by using a Bundle protocol, and includes: the first gateway adds a first control tail to the train operation data at an IP layer to form first data and uploads the first data to a TCP layer; the first control tail comprises a source IP address and a destination IP address of the unmanned aerial vehicle in the IP message control head;
in a TCP layer, adding a second control tail to the first data to form second data, and uploading the second data to a BP layer, wherein the second control tail comprises a source port and a destination port in a TCP message control head;
in a BP layer, storing the first control tail and the second control tail into an expansion block of the Bundle data block;
and in a BP layer, according to the destination IP address and the mapping table, inquiring and obtaining destination node EID information corresponding to the destination IP address, storing the EID information of a source node and the destination node EID information in a control head of the Bundle data block, and encapsulating to finish the Bundle data block.
In one possible design, sending the Bundle data block to a second forwarding node or a second gateway according to destination node EID information in the Bundle data block and node EID information of the second forwarding node includes:
according to a preset routing algorithm rule and the destination node EID information in the Bundle data block, obtaining the EID information of a second forwarding node or the node EID information of a second gateway; sending the Bundle data block to a second forwarding node or a second gateway according to the EID information of the second forwarding node or the node EID information of the second gateway; wherein the destination node EID information comprises EID information of the DTN node to which the ground terminal is connected.
In one possible design, the sending the train operation data block to a terminal according to a destination IP address in the Bundle data block includes:
the second gateway decapsulates the Bundle data block in a BP layer, and acquires a source port, an IP address of the unmanned aerial vehicle, the destination IP address and a destination port from an expansion block of the Bundle data block;
in a TCP layer, adding the source port and the destination port as a first control head to the train operation data to form third data, and sending the third data to an IP layer;
and in an IP layer, adding the IP address and the destination IP address of the unmanned aerial vehicle as a second control head into the third data to form fourth data, and sending the fourth data to a terminal.
In one possible design, the mapping table of the forwarding node stores IP addresses, node EID information, and serial numbers.
In a possible design, the second gateway broadcasts a BP data block encapsulated in a BP layer in a flooding manner, where the BP data block includes an IP address and corresponding node EID information;
the second gateway receives an ACK (acknowledgement) message returned by the forwarding node; and if the ACK confirmation message returned by the forwarding node is not received within the preset time length, retransmitting the BP data block.
In a possible design, the forwarding node receives the BP data block, discards the received BP data block if the BP data block already exists in the mapping table of the forwarding node, and returns an ACK acknowledgement message to the second gateway;
if the BP data block does not exist in the mapping table of the forwarding node, the BP data block is stored in the mapping table of the forwarding node, and is sent to other gateways in a network system, and an ACK (acknowledgement) message is returned to the second gateway;
and if the sequence number in the BP data block is different from the sequence number in the mapping table of the forwarding node, updating the BP data block into the mapping table of the forwarding node, sending the BP data block to other gateways in a network system, and returning an ACK (acknowledgement) message to the second gateway.
In a third aspect, an embodiment of the present invention provides a system for DTN data transmission in a temporary air communication network, including a memory and a processor, where the memory stores executable instructions of the processor; wherein the processor is configured to perform the method of data transmission described in the first aspect via execution of the executable instructions.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for data transmission described in the first aspect.
The invention provides a method, a device and a system for DTN data transmission of a temporary air communication network, wherein the method comprises the following steps: the method is applied to a network system comprising an unmanned aerial vehicle, a first gateway, at least one forwarding node and a second gateway, wherein the first gateway receives train operation data acquired by a camera of the unmanned aerial vehicle; the first gateway encapsulates the train operation data into a Bundle data block through a Bundle protocol according to the train operation data and the destination IP address, and sends the Bundle data block to a forwarding node; the forwarding node receives the Bundle data block and sends the Bundle data block to a second gateway according to node EID information of the forwarding node and destination node EID information in the Bundle data block, wherein the node EID information of the forwarding node is stored in a mapping table obtained in advance through broadcasting; and the second gateway receives the Bundle data block and sends the train operation data to a terminal according to a destination IP address in the Bundle data block. The stability of high dynamic network data link transmission is realized, the continuous transmission of data can be more accurately carried out, and the safe operation and comprehensive guarantee capability of rail transit is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an application scenario of the present invention;
fig. 2 is a schematic process diagram of DTN data transmission for a temporary air communication network according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for DTN data transmission in a temporary air communication network according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus for DTN data transmission in a temporary air communication network according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a system for DTN data transmission in a temporary air communication network according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 1 is a schematic diagram of an application scenario of the present invention, as shown in fig. 1, the data transmission process in this embodiment may include applying to a network system including an unmanned aerial vehicle, a first gateway 11, at least one forwarding node 12, and a second gateway 13, and fig. 2 is a schematic diagram of a DTN data transmission process for a temporary air communication network according to an embodiment of the present invention. As shown in fig. 2, a service application (for example, an unmanned aerial vehicle camera) collects train operation data, encapsulates the train operation data, and transmits the train operation data to a first gateway 11, and the first gateway 11 receives the train operation data collected by the unmanned aerial vehicle camera; the first gateway 11 encapsulates the train operation data into a Bundle data block by using a Bundle Protocol (BP Protocol for short) according to the train operation data and a destination IP address (for example, an IP address of a ground terminal), and sends the Bundle data block to the first forwarding node; the method comprises the steps that a first forwarding node receives a Bundle data block, and sends the Bundle data block to a second forwarding node or a second gateway according to destination node EID information (for example, EID information of a DTN (delay tolerant network) node connected with a ground terminal) in the Bundle data block and node EID information of the second forwarding node, wherein the node EID information of the forwarding node and the destination node is stored in a mapping table obtained in advance through broadcasting; the second gateway 13 (e.g., a ground gateway) receives the Bundle data block and transmits the train operation data to the ground terminal according to the destination IP address and the port number in the Bundle data block. By applying the data transmission method, DTN (delay tolerant network) can be applied to the empty vehicle-to-ground network, the stability of high dynamic network data link transmission can be realized, the continuous transmission of data can be more accurately carried out, and the safe operation and comprehensive guarantee capability of rail transit can be improved. The BP protocol is a main protocol in a DTN network system, and encapsulates data blocks into chunks for transmission by using a managed transmission mechanism. In an alternative embodiment, the BP protocol connects heterogeneous subnetworks into the same network and provides a host-based retransmission service and a long-time data storage function, so that connection problems such as bandwidth delay and link interruption in the network can be easily coped with.
Specifically, fig. 3 is a flowchart of a method for DTN data transmission in a temporary air interface communication network according to an embodiment of the present invention, and as shown in fig. 3, the method for data transmission may be applied to a network system including an unmanned aerial vehicle, a first gateway, at least one forwarding node, and a second gateway, and specifically may include:
s201, a first gateway receives train operation data acquired by an unmanned aerial vehicle camera;
specifically, the unmanned aerial vehicle camera collects train operation data in real time, and uploads the collected train operation data to the first gateway, and in an optional embodiment, the first gateway may include a camera gateway or an application service gateway. The first gateway receives train operation data collected by the unmanned aerial vehicle camera.
S202, the first gateway encapsulates the train operation data into a Bundle data block through a Bundle protocol according to the train operation data and the destination IP address, and sends the Bundle data block to the first forwarding node.
Specifically, step 1: the first gateway adds the first control tail to the train operation data in an IP layer through a bundle protocol to form first data and uploads the first data to a TCP layer; the first control tail comprises a source IP address and a destination IP address of the unmanned aerial vehicle in the IP message control head.
Step 2: and in the TCP layer, adding a second control tail to the first data to form second data, and uploading the second data to the BP layer, wherein the second control tail comprises a source port and a destination port in a TCP message control head.
And step 3: and in the BP layer, storing the first control tail and the second control tail into an expansion block of the Bundle data block.
And 4, step 4: in the BP layer, according to a destination IP address and a mapping table, destination node EID information corresponding to the destination IP address is inquired and obtained, the EID information of a source node and the destination node EID information are stored in a control head of a Bundle data block, the Bundle data block is packaged and completed, and then the Bundle data block is sent to a first forwarding node. In an alternative embodiment, the node EID information is named as { domain name: entity name }. In DTN networks, area names are used to route forwarding, and entity names are translated to protocol standard names within the area when the target area edge is reached. In the BP protocol { domain name: entity name occupies 32 bits, and the domain name and the entity name can be customized.
It should be noted that, in this embodiment, the order of step 3 and step 4 is not limited, and those skilled in the art can perform the limitation according to specific implementation conditions to achieve better effects.
In this embodiment, the first gateway decapsulates the received data packet containing the train operation data, adds the first control tail to the train operation data on the IP layer through a bundle protocol serving as a DTN network architecture to form first data, and uploads the first data to the TCP layer; the first control tail is distinguished by a special identifier, for example, an end is used for the special identifier, and the first control tail comprises a source IP address and a destination IP address of the unmanned aerial vehicle in the IP message control head. In an alternative embodiment, for example, the source IP address of the drone in the IP packet control header is 192.168.0.11, and the destination IP address is 192.168.1.15, which are added to the end of the train operation data with a special identifier of end, to form the first data. In a TCP layer, adding a second control tail to first data to form second data, and uploading the second data to a BP layer, wherein the second control tail is distinguished by a special identifier, for example, an end2 is adopted for special identifier, and the second control tail comprises a source port and a destination port in a TCP message control header; for example, the source port is 01 port and the destination port is 02 port. In an alternative embodiment, for example, the source port in the TCP packet control header is: port 01, destination port: the 02 port is added to the end of the first data with the special identification of end2, forming the second data.
In an optional embodiment, in a BP layer, a BP protocol strips a data block uploaded by a TCP layer to obtain a source IP address and a destination IP address, a source port and a destination port of an unmanned aerial vehicle; and storing the IP addresses and the port information into an expansion block of the Bundle data block, and sending the IP addresses and the port information along with the Bundle data block. In this embodiment, the first gateway stores the relevant addressing parts in the TCP and IP control headers into the extension block of the Bundle block, so that the second gateway can convert and recover the addressing parts into IP addresses, port numbers, and the like according to the standard protocol format.
In a BP layer, a BP protocol inquires and obtains destination node EID information (for example, EID information of a DTN node connected with a ground terminal) corresponding to a destination IP address according to the destination IP address and a prestored mapping table, stores the EID information of a source node (for example, EID information of a first gateway) and the EID information of a destination node in corresponding positions of a control head of a Bundle data block, and encapsulates the complete Bundle data block; and then sending the Bundle data block to the first forwarding node. In an optional embodiment, node EID information of a forwarding node is obtained according to a preset routing algorithm rule and destination node EID information in the Bundle data block; and sending the Bundle data block to the forwarding node according to the node EID information of the forwarding node. Wherein the forwarding node comprises at least one.
And S203, the first forwarding node receives the Bundle data block, and sends the Bundle data block to a second forwarding node or a second gateway according to destination node EID information in the Bundle data block and node EID information of the second forwarding node, wherein the forwarding node and the destination node EID information are stored in a mapping table obtained in advance through broadcasting.
Specifically, a forwarding node receives a Bundle data block, and obtains EID information of a second forwarding node or node EID information of a second gateway according to a preset routing algorithm rule and destination node EID information in the Bundle data block; and sending the Bundle data block to a second forwarding node or a second gateway according to the EID information of the second forwarding node or the node EID information of the second gateway, wherein the node EID information of the forwarding node and the destination node is stored in a mapping table of the forwarding node obtained in advance through broadcasting. In an alternative embodiment, the second gateway may comprise a terrestrial gateway; the destination node EID information may include node EID information of the second gateway or EID information of a DTN node to which the terrestrial terminal is connected.
In this embodiment, the forwarding node receives the Bundle data block sent by the first gateway, in an optional embodiment, a DTN routing module may be used to perform routing and forwarding, and according to the destination node EID information in the Bundle data block, a CGR contact graph routing algorithm is used to obtain the node EID information of the second gateway. And sending the Bundle data block to the second gateway. In an optional embodiment, the mapping table of the forwarding node stores a plurality of gateway IP addresses and corresponding node EID information, serial numbers, and the like.
In an alternative embodiment, the forwarding nodes may include a first forwarding node, a second forwarding node, a third forwarding node, and so on. For example, a first forwarding node receives a Bundle data block sent by a first gateway, performs routing and routing by using a DTN (delay tolerant network) routing module according to destination node EID information in the Bundle data block to obtain node EID information of a second forwarding node, sends the Bundle data block to a second forwarding node, receives the Bundle data block sent by the first forwarding node, performs routing and routing by using the DTN routing module according to the destination node EID information in the Bundle data block to obtain node EID information of the second gateway, and sends the Bundle data block to the second gateway. In an alternative embodiment, the data transmission system may employ a third forwarding node to receive a Bundle data block and the like sent by the first gateway, and the subsequent data transmission process is similar to the above implementation process, and is not described herein again. In an alternative embodiment, the Bundle data block may pass through multiple forwarding nodes when being transmitted between the first gateway and the second gateway, and the implementation process of the forwarding nodes is similar to the data transmission process described above, and details are not described here. The first forwarding node, the second forwarding node, and the third forwarding node are used to distinguish similar objects, and are not used to describe a specific order or sequence.
In the embodiment, the problems of frequent interruption, long delay and the like in a limited network are effectively solved through a managed transmission mechanism of a BP protocol, and the effectiveness of data transmission is ensured.
And S204, the second gateway receives the Bundle data block and sends the train operation data to the terminal according to the destination IP address in the Bundle data block.
Specifically, the second gateway receives the Bundle data block, decapsulates the Bundle data block in the BP layer, and obtains the source port, the IP address of the unmanned aerial vehicle, the destination IP address, and the destination port from the extension block of the Bundle data block.
In the TCP layer, the source port and the destination port are added as a first control header to the train operation data, the first control header is represented by using an encapsulation format of an existing standard TCP/IP protocol, for example, to form third data, and the third data is sent to the IP layer.
In the IP layer, the IP address of the drone and the destination IP address are added to the third data as a second control header, the second control header is represented by using an encapsulation format of an existing standard TCP/IP protocol, for example, to form fourth data, and the fourth data is sent to the terminal.
In this embodiment, when the second gateway receives the Bundle data block, the Bundle data block is decapsulated in the BP layer, and the source port (for example 01), the IP address of the drone (for example 192.168.0.11), the destination IP address (for example 192.168.1.15), and the destination port (for example 02) are obtained from the extension block of the Bundle data block. In the TCP layer, the port 01 and the port 02 are added to the train operation data as a first control header to form third data, and the third data is transmitted to the IP layer. In an alternative embodiment, for example, the source port in the extension block of the Bundle data block is: port 01, destination port: the 02 port is added as a first control header to the header of the train operation data in a standard encapsulated format and forms third data. In the IP layer, the IP address 192.168.0.11 and the destination IP address 192.168.1.15 of the drone in the extension block of the Bundle data block are added to the third data as a second control header to form fourth data, and the fourth data is transmitted to the terminal. In an alternative embodiment, the IP address 192.168.0.11 and the destination IP address 192.168.1.15 of the drone in the extension block of the Bundle data block are added as a second control header to the header of the third data in a standard encapsulation format, for example, and form the fourth data. In an alternative embodiment, the second gateway sends the fourth data to the ground terminal (e.g. a mobile phone app, a computer, etc.) according to the destination IP address and the destination port.
In this embodiment, after being sent by a source node (e.g., a service application node), data of a service application is forwarded to a destination node (e.g., a ground terminal node) through a relay node for data transmission, so that stability of high dynamic network data link transmission is achieved, and continuous transmission of the data can be performed more accurately.
In an optional embodiment, the mapping table of the forwarding node stores an IP address, node EID information, and a sequence number. In an alternative embodiment, the mapping table of the forwarding node is stored in a preset memory of the forwarding node, for example, referring to table 1 below, for example, IP addresses are stored: 192.168.0.13, node EID information { DTN1:1}, and sequence number 101, etc.
TABLE 1
Serial number IP address Node EID information
090 …… {DTN2:2}
101 192.168.0.13 {DTN1:1}
…… 192.168.1.17 ……
In this embodiment, the known destination IP address and the corresponding node EID information are stored in the mapping table, which ensures the anti-interference performance and accuracy of DTN data transmission for the air-to-air communication network.
In an optional embodiment, the second gateway broadcasts a BP data block encapsulated in a BP layer in a flooding manner, where the BP data block includes an IP address and corresponding node EID information; the second gateway receives an ACK (acknowledgement) message returned by the forwarding node; and if the ACK confirmation message returned by the forwarding node is not received within the preset time length, the BP data block is retransmitted.
Specifically, a second gateway (e.g., a ground gateway) broadcasts a BP data block encapsulated by a BP layer in a flooding manner, transmits the BP data block to other neighboring nodes in the network system, and each neighboring node transmits the BP data block to its own neighboring node except for the neighboring node for broadcasting, if the second gateway receives an ACK acknowledgement message returned by the forwarding node.
And if the ACK confirmation message returned by the forwarding node is not received within the preset time length, the second gateway retransmits the BP data block. The preset time period is not specifically limited in this embodiment, and may be, for example, 0.2 ms.
In the embodiment, the IP address of each node and the corresponding EID information are perfected by using a flooding broadcast mode and are pre-stored in the mapping table of each node, so that the first gateway can obtain the destination IP address from the destination node EID information corresponding to the destination IP address according to the mapping table in the data transmission process, and data transmission can be performed in the DTN network more accurately and at high speed.
In an alternative embodiment, the forwarding node receives the BP data block, discards the received BP data block if the BP data block already exists in the mapping table of the forwarding node, and returns an ACK acknowledgement message to the second gateway.
If the BP data block does not exist in the mapping table of the forwarding node, the BP data block is stored in the mapping table of the forwarding node, and is sent to other gateways in the network system, and an ACK confirmation message is returned to the second gateway.
And if the sequence number in the BP data block is different from the sequence number in the mapping table of the forwarding node, updating the BP data block into the mapping table of the forwarding node, sending the BP data block to other gateways in the network system, and returning an ACK (acknowledgement) message to the second gateway.
Fig. 4 is a schematic structural diagram of a device for DTN data transmission in a temporary air communication network according to a second embodiment of the present invention, and as shown in fig. 4, the device for data transmission may include:
the first gateway 31 is used for receiving train operation data acquired by the unmanned aerial vehicle camera;
the first gateway 31 is further configured to encapsulate the train operation data into Bundle data blocks according to the train operation data and the destination IP address by using a Bundle protocol, and send the Bundle data blocks to the forwarding node;
the first forwarding node 32 is configured to receive the Bundle data block, and send the Bundle data block to a second forwarding node or a second gateway 33 according to destination node EID information in the Bundle data block and node EID information of the second forwarding node, where the forwarding node and the destination node EID information are stored in a mapping table obtained in advance through broadcasting;
the second gateway 33 is configured to receive the Bundle data block, and send the train operation data to the terminal according to the destination IP address in the Bundle data block.
In an alternative embodiment, the first gateway 31 encapsulates the train operation data into Bundle data blocks according to the train operation data and the destination IP address by using a Bundle protocol, and includes: the first gateway 31 adds the first control tail to the train operation data at the IP layer to form first data, and uploads the first data to the TCP layer; the first control tail comprises a source IP address and a destination IP address of the unmanned aerial vehicle in the IP message control head;
in a TCP layer, adding a second control tail to first data to form second data, and uploading the second data to a BP layer, wherein the second control tail comprises a source port and a destination port in a TCP message control head;
in a BP layer, storing a first control tail and a second control tail into an expansion block of a Bundle data block;
in the BP layer, according to the destination IP address and the mapping table, destination node EID information corresponding to the destination IP address is inquired and obtained, the EID information of the source node and the destination node EID information are stored in a control head of the Bundle data block, and the Bundle data block is packaged.
In an alternative embodiment, sending the Bundle data block to the second forwarding node or the second gateway 33 according to the destination node EID information in the Bundle data block and the node EID information of the second forwarding node includes:
according to a preset routing algorithm rule and the destination node EID information in the Bundle data block, obtaining the EID information of a second forwarding node or the node EID information of a second gateway; and sends the Bundle data block to the second forwarding node or the second gateway 33 according to the EID information of the second forwarding node or the node EID information of the second gateway, where the EID information of the destination node includes the EID information of the DTN node to which the ground terminal is connected.
In an alternative embodiment, the sending the train operation data block to the terminal according to the destination IP address in the Bundle data block includes:
the second gateway 33 decapsulates the Bundle data block in the BP layer, and acquires the source port, the IP address of the unmanned aerial vehicle, the destination IP address, and the destination port from the extension block of the Bundle data block;
in a TCP layer, adding a source port and a destination port as first control heads into train operation data to form third data, and sending the third data to an IP layer;
and in the IP layer, adding the IP address and the destination IP address of the unmanned aerial vehicle as a second control head into the third data to form fourth data, and sending the fourth data to the terminal.
In an alternative embodiment, the mapping table of the forwarding node stores the IP address, the node EID information, and the sequence number.
In an optional embodiment, the second gateway 33 broadcasts a BP data block encapsulated in the BP layer in a flooding manner, where the BP data block includes an IP address and corresponding node EID information;
the second gateway receives an ACK (acknowledgement) message returned by the forwarding node; and if the ACK confirmation message returned by the forwarding node is not received within the preset time length, the BP data block is retransmitted.
In an optional embodiment, the forwarding node receives the BP data block, and if the BP data block already exists in the mapping table of the forwarding node, discards the received BP data block, and returns an ACK acknowledgement message to the second gateway 33;
if the BP data block does not exist in the mapping table of the forwarding node, the BP data block is stored in the mapping table of the forwarding node, and is sent to other gateways in the network system, and an ACK confirmation message is returned to the second gateway 33;
if the sequence number in the BP data block is not the same as the sequence number in the mapping table of the forwarding node, the BP data block is updated to the mapping table of the forwarding node, and the BP data block is sent to other gateways in the network system, and an ACK confirmation message is returned to the second gateway 33.
The data transmission apparatus of this embodiment may execute the technical solution in the method shown in fig. 3, and for the specific implementation process and the technical principle, reference is made to the relevant description in the method shown in fig. 3, which is not described herein again.
Fig. 5 is a schematic structural diagram of a system for DTN data transmission in a temporary air communication network according to a third embodiment of the present invention, and as shown in fig. 5, the system 40 may include: a processor 41 and a memory 42.
A memory 42 for storing a computer program (such as an application program, a functional module, and the like implementing the above-described method of data transmission), computer instructions, and the like;
the computer programs, computer instructions, etc. described above may be stored in one or more memories 42 in partitions. And the above-mentioned computer program, computer instructions, data, etc. can be called by the processor 41.
A processor 41 for executing the computer program stored in the memory 42 to implement the steps of the method according to the above embodiments.
Reference may be made in particular to the description relating to the preceding method embodiment.
The processor 41 and the memory 42 may be separate structures or may be integrated structures integrated together. When the processor 41 and the memory 42 are separate structures, the memory 42 and the processor 41 may be coupled by a bus 43.
The server in this embodiment may execute the technical solution in the method shown in fig. 3, and for the specific implementation process and the technical principle, reference is made to the relevant description in the method shown in fig. 3, which is not described herein again.
In addition, embodiments of the present application further provide a computer-readable storage medium, in which computer-executable instructions are stored, and when at least one processor of the user equipment executes the computer-executable instructions, the user equipment performs the above-mentioned various possible methods.
Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in user equipment. Of course, the processor and the storage medium may reside as discrete components in a communication device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for DTN data transmission for a temporary air communication network, characterized by: the application is in a network system comprising an unmanned aerial vehicle, a first gateway, at least one forwarding node and a second gateway, and comprises the following steps:
the method comprises the steps that a first gateway receives train operation data collected by an unmanned aerial vehicle camera;
the first gateway encapsulates the train operation data into a Bundle data block through a Bundle protocol according to the train operation data and the destination IP address, and sends the Bundle data block to a first forwarding node;
the first forwarding node receives the Bundle data block, and sends the Bundle data block to a second forwarding node or a second gateway according to destination node EID information obtained by inquiring a mapping table in the Bundle data block, wherein the node EID information of the forwarding node and the destination node is stored in a mapping table obtained in advance through broadcasting, and an IP address and node EID information corresponding to the IP address are stored in the mapping table;
and the second gateway receives the Bundle data block and sends the train operation data to a terminal according to the destination IP address and the port number in the Bundle data block.
2. The method of claim 1, wherein the first gateway encapsulates the train operation data into Bundle data blocks according to the train operation data and a destination IP address by a Bundle protocol, comprising:
the first gateway adds a first control tail to the train operation data at an IP layer to form first data and uploads the first data to a TCP layer; the first control tail comprises a source IP address and a destination IP address of the unmanned aerial vehicle in the IP message control head;
in a TCP layer, adding a second control tail to the first data to form second data, and uploading the second data to a BP layer, wherein the second control tail comprises a source port and a destination port in a TCP message control head;
in a BP layer, storing the first control tail and the second control tail into an expansion block of the Bundle data block;
and in a BP layer, according to the destination IP address and the mapping table, inquiring and obtaining destination node EID information corresponding to the destination IP address, storing the EID information of a source node and the destination node EID information in a control head of the Bundle data block, and encapsulating to finish the Bundle data block.
3. The method of claim 1, wherein sending the Bundle data block to a second forwarding node or a second gateway according to destination node EID information in the Bundle data block and node EID information of the second forwarding node comprises:
according to a preset routing algorithm rule and the destination node EID information in the Bundle data block, obtaining the EID information of a second forwarding node or the node EID information of a second gateway; sending the Bundle data block to a second forwarding node or a second gateway according to the EID information of the second forwarding node or the node EID information of the second gateway; wherein the destination node EID information comprises EID information of the DTN node to which the ground terminal is connected.
4. The method of claim 1, wherein transmitting the train operation data block to a terminal according to a destination IP address in the Bundle data block comprises:
the second gateway decapsulates the Bundle data block in a BP layer, and acquires a source port, an IP address of the unmanned aerial vehicle, the destination IP address and a destination port from an expansion block of the Bundle data block;
in a TCP layer, adding the source port and the destination port as a first control head to the train operation data to form third data, and sending the third data to an IP layer;
and in an IP layer, adding the IP address and the destination IP address of the unmanned aerial vehicle as a second control head into the third data to form fourth data, and sending the fourth data to a terminal.
5. The method of claim 1, wherein the forwarding node has a mapping table with IP addresses, node EID information, and sequence numbers stored therein.
6. The method of claim 5, wherein the second gateway broadcasts a BP data block encapsulated in a BP layer in a flooding manner, wherein the BP data block comprises an IP address and corresponding node EID information;
the second gateway receives an ACK (acknowledgement) message returned by the forwarding node; and if the ACK confirmation message returned by the forwarding node is not received within the preset time length, retransmitting the BP data block.
7. The method of claim 6, wherein the forwarding node receives the BP data block, discards the received BP data block if the BP data block already exists in the mapping table of the forwarding node, and returns an ACK acknowledgement message to the second gateway;
if the BP data block does not exist in the mapping table of the forwarding node, the BP data block is stored in the mapping table of the forwarding node, and is sent to other gateways in a network system, and an ACK (acknowledgement) message is returned to the second gateway;
and if the sequence number in the BP data block is different from the sequence number in the mapping table of the forwarding node, updating the BP data block into the mapping table of the forwarding node, sending the BP data block to other gateways in a network system, and returning an ACK (acknowledgement) message to the second gateway.
8. An apparatus for DTN data transmission for a temporary air communication network, characterized in that: the device is applied to a network system comprising an unmanned aerial vehicle, a first gateway, at least one forwarding node and a second gateway, and comprises the following components:
the first gateway is used for receiving train operation data acquired by the unmanned aerial vehicle camera;
the first gateway is further used for encapsulating the train operation data into a Bundle data block through a Bundle protocol according to the train operation data and the destination IP address, and sending the Bundle data block to a first forwarding node;
the first forwarding node is configured to receive the Bundle data block, and send the Bundle data block to a second forwarding node or a second gateway according to destination node EID information obtained by querying a mapping table in the Bundle data block, where the forwarding node and the destination node EID information are stored in a mapping table obtained by broadcasting in advance, and an IP address and node EID information corresponding to the IP address are stored in the mapping table;
and the second gateway is used for receiving the Bundle data block and sending the train operation data to a terminal according to the destination IP address and the destination port number in the Bundle data block.
9. A system for DTN data transmission for a temporary air communication network, comprising a memory and a processor, the memory having stored therein executable instructions of the processor; wherein the processor is configured to perform the method of data transmission of any of claims 1-7 via execution of the executable instructions.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of data transmission according to any one of claims 1 to 7.
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