CN116248172B - Data transmission method, device and storage medium based on TCP/IP protocol and CCSDS protocol - Google Patents
Data transmission method, device and storage medium based on TCP/IP protocol and CCSDS protocol Download PDFInfo
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- CN116248172B CN116248172B CN202310507077.7A CN202310507077A CN116248172B CN 116248172 B CN116248172 B CN 116248172B CN 202310507077 A CN202310507077 A CN 202310507077A CN 116248172 B CN116248172 B CN 116248172B
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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
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
Abstract
The application discloses a data transmission method, a device and a storage medium based on TCP/IP protocol and CCSDS protocol, comprising the following steps: the protocol gateway acquires satellite communication parameters according to a preset period, wherein the satellite communication parameters are used for indicating the network state during satellite communication; the protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters; the terminal equipment adjusts the data length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway; the terminal equipment generates an adjusted TCP message and generates an IP data packet according to the TCP message; and the protocol gateway generates a CCSDS space packet according to the received IP data packet transmitted by the terminal equipment. Thus, the technical effect of being able to reduce the delay of transmission is achieved by the above operation.
Description
Technical Field
The present invention relates to the field of satellite communications technologies, and in particular, to a data transmission method, apparatus, and storage medium based on a TCP/IP protocol and a CCSDS protocol.
Background
The TCP/IP protocol and the CCSDS protocol are common communication protocols in a network communication system consisting of a terrestrial network and satellite communication. Fig. 1 shows a conventional network communication system composed of a terrestrial network and satellite communication. Referring to fig. 1, the network communication system includes protocol gateways 200, 500, satellites 300, 400, and terminal devices 100, 600. Wherein the terminal devices 100, 600 communicate, for example, via the network communication system.
Further, referring to fig. 1, communication is performed between the terminal device 100 and the protocol gateway 200 through a TCP/IP protocol. The protocol gateway 200, 500 is used to implement protocol conversion between the TCP/IP protocol and the CCSDS AOS protocol. So that when the terminal device 100 transmits data to the server 600, an IP packet encapsulating the transmitted data can be transmitted to the protocol gateway 200 through the TCP/IP protocol. After receiving the IP packet, the protocol gateway 200 performs protocol conversion and converts it into an AOS space link frame based on the CCSDS AOS protocol. And then transmitted to the protocol gateway 500 via the satellites 300, 400 over the AOS spatial link. The protocol gateway 500 parses the AOS spatial link frame after receiving it to obtain an IP packet, and then transmits the IP packet to the server 600 based on the TCP/IP protocol.
Fig. 2 shows a schematic diagram of data transmission of a conventional terminal device. Referring to fig. 2, in the terminal device 100, a TCP protocol is deployed at a transport layer, and is used to split a data byte stream transmitted by an application layer into a plurality of TCP packets. The IP protocol is deployed in the network layer and is used for adding an IP header in the TCP message header to generate a corresponding IP data packet. The link layer adds an Ethernet header and an Ethernet trailer to the IP data packet, generates an Ethernet frame and transmits the Ethernet frame.
Fig. 3 shows a schematic diagram of data transmission of a conventional protocol gateway. Referring to fig. 3, in the protocol gateway 200, 500, ethernet frames are first received through a link layer and IP packets are parsed at a network layer. An AOS spatial link frame is then generated by the AOS layer based on the IP data packet. Finally, it is transmitted via a spatial link to the satellites 300, 400 through the RF layer.
The TCP/IP protocol and the CCSDS protocol have the advantages of reliability and integrity. However, the real-time performance of data transmission is not satisfied, and delay is likely to occur. There is therefore a need to optimize the transmission process to reduce the delay in the transmission process.
In addition, in the AOS protocol, the lengths of the m_pdu and AOS space link frame are fixed, and the received IP packet data length is not fixed, so the length of the CCSDS space packet generated based on the IP packet is also not fixed. Thus, it is necessary to split the CCSDS space packet into a plurality of m_pdus (when the length of the CCSDS space packet is greater than the length of the AOS space link frame), or to merge the plurality of CCSDS space packets into one m_pdu (when the length of the CCSDS space packet is less than the length of the AOS space link frame). Sometimes, the same CCSDS space packet is split into two different parts, and the two different parts are respectively filled into different m_pdus. These operations obviously increase the duration of protocol conversion and increase the delay in transmission.
In addition, since the network of satellite communication is unstable, when the satellite communication network is in good condition, a space link frame of a larger length can be transmitted; when the network of satellite communications is unstable, it is preferable to transmit a smaller length of spatial link frame in order to avoid transmission errors. Because the length of the AOS space link frame in the existing protocol is fixed, the method cannot adapt to different network states, so that the probability of error occurrence is increased, and the CCSDS protocol is triggered to continuously retransmit the data packet, so that the transmission delay is further increased.
The publication number is CN113507722A, and the name is a method for realizing a platform for controlling congestion of a low-orbit satellite based on NS 3. According to the hierarchical structure of the TCP/IP communication protocol, a platform for controlling congestion of the low-orbit satellite is built in a simulation simulator NS 3; when installing network equipment and channels, a communication task queue is established for each satellite, when installing a network protocol stack, a routing control strategy for displaying load balance is set, satellite load states are checked at regular time, and the routing control strategy is sent to adjacent satellites, so that data traffic transmission among satellites is controlled according to satellite states.
Publication number CN113438139B, entitled apparatus and method for inspecting frames from a communication bus. Comprising the following steps: determining whether frames received from the communication bus are encoded according to a particular communication protocol and addressed to a particular electronic device; when the frame is encoded according to the particular communication protocol and addressed to the particular electronic device based on the determination, incrementing a frame count value, wherein incrementing the frame count value includes incrementing a count of a modulo counter circuit having a first bit depth, and the frame count value is constrained to the modulo value of the modulo counter circuit; the frame count status bit is set based on comparing the frame count value to a threshold value and a frame including the frame counter status bit is transmitted over the communication bus and the frame count value is reset at the end of the monitoring time interval.
For the above-mentioned prior art, since the data length of the IP data packet is not constant, when the length of the CCSDS space packet is greater than the length of the AOS space link frame, the CCSDS space packet needs to be split into a plurality of m_pdus; when the length of the CCSDS space packet is smaller than the length of the AOS space link frame, the operation of combining a plurality of CCSDS space packets into one m_pdu is required, which increases the duration of protocol conversion, thereby increasing the technical problem of delay in the transmission process, and no effective solution has been proposed.
Disclosure of Invention
Embodiments of the present disclosure provide a data transmission method, apparatus, and storage medium based on a TCP/IP protocol and a CCSDS protocol, so as to at least solve the problem in the prior art that, because the data length of an IP data packet is not constant, when the length of a CCSDS space packet is greater than the length of an AOS space link frame, the CCSDS space packet needs to be split into a plurality of m_pdus; when the length of the CCSDS space packet is smaller than the length of the AOS space link frame, an operation of combining a plurality of CCSDS space packets into one m_pdu is required, which increases the duration of protocol conversion, thereby increasing the technical problem of delay of the transmission process.
According to an aspect of the embodiments of the present disclosure, there is provided a data transmission method based on a TCP/IP protocol and a CCSDS protocol, including: the protocol gateway acquires satellite communication parameters according to a preset period, wherein the satellite communication parameters are used for indicating the network state during satellite communication; the protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters; the terminal equipment adjusts the length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway; the terminal equipment generates an adjusted TCP message and generates an IP data packet according to the TCP message; and the protocol gateway generates a CCSDS space packet according to the received IP data packet transmitted by the terminal equipment.
According to another aspect of the embodiments of the present disclosure, there is also provided a storage medium including a stored program, wherein the method of any one of the above is performed by a processor when the program is run.
According to another aspect of the embodiments of the present disclosure, there is also provided a data transmission apparatus based on a TCP/IP protocol and a CCSDS protocol, including: a multiplexed data unit adjustment module, wherein the multiplexed data unit adjustment module is configured to obtain satellite communication parameters at a predetermined period, wherein the satellite communication parameters are used to indicate a network state at the time of satellite communication; the multiplexing data unit adjusting module is configured to determine the data length of the multiplexing data unit according to the satellite communication parameters; the data length adjusting module is configured to adjust the data length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway; the TCP message generation module is configured to generate an adjusted TCP message and generate an IP data packet according to the TCP message; and a CCSDS packet generation module, wherein the CCSDS generation module is configured to receive the IP data packet transmitted by the terminal equipment and generate a CCSDS space packet.
According to another aspect of the embodiments of the present disclosure, there is also provided a data transmission apparatus based on a TCP/IP protocol and a CCSDS protocol, including: a processor; and a memory, coupled to the processor, for providing instructions to the processor for processing the steps of: the protocol gateway acquires satellite communication parameters according to a preset period, wherein the satellite communication parameters are used for indicating the network state during satellite communication; the protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters; the terminal equipment adjusts the length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway; the terminal equipment generates an adjusted TCP message and generates an IP data packet according to the TCP message; and the protocol gateway generates a CCSDS space packet according to the received IP data packet transmitted by the terminal equipment.
The application discloses a data transmission method based on TCP/IP protocol and CCSDS protocol. Because the protocol gateway determines the data length of the multiplexing data unit according to the pre-acquired satellite communication parameters, the data length of the multiplexing data unit is most matched with the current network state of satellite communication. And the terminal equipment adjusts the length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway, so that the CCSDS space packet generated according to the TCP message is exactly matched with the data length of the multiplexing data unit. Thus, the technical effect of being able to reduce the delay of transmission is achieved by the above operation. Further, the problem that in the prior art, because the data length of an IP data packet is not fixed, when the length of a CCSDS space packet is larger than the length of an AOS space link frame, the CCSDS space packet needs to be split into a plurality of M_PDU; when the length of the CCSDS space packet is smaller than the length of the AOS space link frame, an operation of combining a plurality of CCSDS space packets into one m_pdu is required, which increases the duration of protocol conversion, thereby increasing the technical problem of delay of the transmission process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and do not constitute an undue limitation on the disclosure. In the drawings:
FIG. 1 is a prior art network communication system comprising a terrestrial network and satellite communications;
fig. 2 is a schematic diagram of data transmission of a conventional terminal device;
FIG. 3 is a schematic diagram of data transmission of a conventional protocol gateway;
fig. 4 is a schematic diagram of a hardware architecture of a satellite system according to the first aspect of embodiment 1 of the present application;
FIG. 5 is a schematic diagram of a protocol model of a conventional terminal device and protocol gateway;
fig. 6 is a schematic diagram of a protocol model of a terminal device and a protocol gateway according to the first aspect of embodiment 1 of the present application;
fig. 7 is a flowchart of a data transmission method based on the TCP/IP protocol and the CCSDS protocol according to the first aspect of embodiment 1 of the present application;
fig. 8 is a schematic diagram of a data transmission apparatus based on the TCP/IP protocol and the CCSDS protocol according to the first aspect of embodiment 2 of the present application; and
fig. 9 is a schematic diagram of a data transmission apparatus based on the TCP/IP protocol and the CCSDS protocol according to the first aspect of embodiment 3 of the present application.
Detailed Description
In order to better understand the technical solutions of the present disclosure, the following description will clearly and completely describe the technical solutions of the embodiments of the present disclosure with reference to the drawings in the embodiments of the present disclosure. It will be apparent that the described embodiments are merely embodiments of a portion, but not all, of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure, shall fall within the scope of the present disclosure.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or 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.
Example 1
According to the present embodiment, there is provided a method embodiment of data transmission based on the TCP/IP protocol and the CCSDS protocol, it should be noted that the steps shown in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in an order different from that herein.
Fig. 4 further shows a schematic diagram of the hardware architecture of the satellite system. Referring to fig. 4, the satellite systems 300, 400 include an integrated electronic system comprising: processor, memory, bus management module and communication interface. Wherein the memory is coupled to the processor such that the processor can access the memory, read program instructions stored in the memory, read data from the memory, or write data to the memory. The bus management module is connected to the processor and also to a bus, such as a CAN bus. The processor can communicate with the satellite-borne peripheral connected with the bus through the bus managed by the bus management module. In addition, the processor is also in communication connection with the camera, the star sensor, the measurement and control transponder, the data transmission equipment and other equipment through the communication interface. It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 4 is merely illustrative and is not intended to limit the configuration of the electronic device described above. For example, the satellite system may also include more or fewer components than shown in FIG. 4, or have a different configuration than shown in FIG. 4.
It should be noted that one or more of the processors and/or other data processing circuits shown in fig. 4 may be referred to herein generally as a "data processing circuit". The data processing circuit may be embodied in whole or in part in software, hardware, firmware, or any other combination. Furthermore, the data processing circuitry may be a single stand-alone processing module, or incorporated in whole or in part into any of the other elements in the computing device. As referred to in the embodiments of the present disclosure, the data processing circuit acts as a processor control (e.g., selection of the variable resistance termination path to interface with).
The memory shown in fig. 4 may be used to store software programs and modules of application software, such as program instructions/data storage devices corresponding to data transmission based on TCP/IP protocol and CCSDS protocol in the embodiments of the present disclosure, and the processor executes various functional applications and data processing by running the software programs and modules stored in the memory, that is, implementing the data transmission based on TCP/IP protocol and CCSDS protocol of the application program described above. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid state memory
It should be noted here that in some alternative embodiments, the apparatus shown in fig. 4 described above may include hardware elements (including circuits), software elements (including computer code stored on a computer readable medium), or a combination of both hardware and software elements. It should be noted that fig. 4 is only one example of a specific example and is intended to illustrate the types of components that may be present in the above-described apparatus.
Fig. 5 is a schematic diagram of a protocol model of a conventional terminal device 100 and a protocol gateway 200. Referring to fig. 5, the terminal device 100 includes an application layer, a transport layer, a network layer, and a link layer. The TCP protocol is deployed at the transmission layer and is used for splitting a data byte stream transmitted by the application layer into a plurality of TCP messages. The IP protocol is deployed in the network layer and is used for adding an IP header in the TCP message header and generating a corresponding IP data packet. The link layer adds an Ethernet header and an Ethernet trailer to the IP data packet, generates an Ethernet frame and transmits the Ethernet frame.
Referring to fig. 5, protocol gateway 200 includes stack (1) and stack (2). Wherein the stack (1) comprises a network layer and a link layer. The stack (2) comprises a network layer, an AOS layer and an RF layer. The protocol gateway 200 first receives the ethernet frames transmitted by the link layer of the terminal device 100 through the link layer and parses the IP packets in the network layer. AOS spatial link frames are then generated by the AOS layer based on the IP packets and then transmitted by the RF layer to satellites 300, 400 via the spatial links.
Fig. 6 shows a schematic diagram of a protocol model of the terminal device 100 and the protocol gateway 200 according to an embodiment of the present application. Referring to fig. 6, the terminal device 100 includes an application layer, a transport layer, a network layer, and a link layer. The transmission layer of the terminal device 100 is provided with a data length adjustment module, which is used for adjusting the length of application data in the TCP packet. The terminal device 100 thus adjusts the data length of the TCP message according to the data length of the multiplexed data unit transmitted from the protocol gateway 200. Specifically, the data length adjustment module in the terminal device 100 segments the byte stream of the application layer, thereby generating application data corresponding to the determined data length of the multiplexed data unit, and then further generates a TCP packet on the basis thereof.
The protocol gateway 200 includes a transport layer, a network layer, a link layer, an AOS layer, and an RF layer. The protocol gateway 200 is added with an m_pdu adjusting module, so that the m_pdu adjusting module can monitor satellite communication parameters (for example, communication parameters of a space link) in real time, and determine a data length of the multiplexed data unit according to the monitored satellite communication parameters. And a transport layer is added to the stack (1) of the protocol gateway 200, so that the stack (1) of the protocol gateway 200 forms a protocol stack structure of a TCP/IP model.
Thus, the protocol gateway 200 may transmit the data length of the multiplexed data unit to the terminal device 100. Further, since the data length of the multiplexed data unit corresponds to the data length of the CCSDS space packet, the data length of the CCSDS space packet corresponds to the data length of the IP data packet, and the data length of the IP data packet corresponds to the data length of the TCP packet application data. Thus, the data length adjustment module in the transport layer of the terminal device 100 can adjust the data length of the application data in the TCP packet generated by the original TCP protocol according to the data length of the multiplexed data unit transmitted by the protocol gateway 200.
In addition, the link layer of the terminal device 100 can transmit data to the link layer of the protocol gateway 200, and the link layer of the protocol gateway 200 can transmit spatial link state information to the link layer of the terminal device 100.
In the above-described operating environment, according to a first aspect of the present embodiment, there is provided a data transmission method based on a TCP/IP protocol and a CCSDS protocol, the method being implemented by a processor shown in fig. 4. Fig. 7 shows a schematic flow chart of the method, and referring to fig. 7, the method includes:
S702: the protocol gateway acquires satellite communication parameters according to a preset period, wherein the satellite communication parameters are used for indicating the network state during satellite communication;
s704: the protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters;
s706: the terminal equipment adjusts the length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway;
s708: the terminal equipment generates an adjusted TCP message and generates an IP data packet according to the TCP message; and
s710: the protocol gateway generates a CCSDS space packet according to the IP data packet transmitted by the terminal equipment.
Specifically, first, the m_pdu adjusting module in the protocol gateway 200 acquires satellite communication parameters at a predetermined period (S702). Wherein the satellite communication parameters are used to indicate the network state at the time of satellite communication. The satellite communication parameter may be, for example, signal strengtha 1 Signal to noise ratioa 2 Bit error ratea 3 Delay ofa 4 Bandwidth ofa 5 Loss rate ofa 6 Retransmission ratea 7 . Specifically, for example, the protocol gateway 200 acquires the satellite communication parameter vector a= [a 1 ,a 2 ,a 3 ,a 4 ,a 5 ,a 6 ,a 7 ] T 。
Then, the m_pdu adjusting module in the protocol gateway 200 determines the data length of the multiplexed data unit according to the satellite communication parameters (S704). Specifically, first, the m_pdu adjustment module in the protocol gateway 200 communicates a parameter vector a= [ for satellite ] a 1 ,a 2 ,a 3 ,a 4 ,a 5 ,a 6 ,a 7 ] T Preprocessing is performed to obtain a satellite communication parameter vector A= [a 1 ,a 2 ,a 3 ,a 4 ,a 5 ,a 6 ,a 7 ] T Corresponding satellite characteristic parameter b= [b 1 ,b 2 ,b 3 ,b 4 ,b 5 ,b 6 ,b 7 ] T . For satellite communication parameter vector a= [a 1 ,a 2 ,a 3 ,a 4 ,a 5 ,a 6 ,a 7 ] T The operation steps for the pretreatment will be described in detail later, and will not be described in detail here.
Further, the data length of the multiplexed data units may be, for exampleL 1 ，L 2 ，L 3 ......L m . Wherein, the liquid crystal display device comprises a liquid crystal display device,L m ＞......＞L 3 ＞L 2 ＞L 1 . For example, the data length of the multiplexed data unitsL 1 For 256 bytes, multiplexing the data length of the data unitL 2 For 512 bytes, multiplexing data length of data unitL 3 Is 1024 bytes. Thus, the M_PDU adjustment module in the protocol gateway 200 is capable of determining the data length of the multiplexed data units as based on the probability function and the satellite feature parametersL 1 ，L 2 ，L 3 ......L m Probability values of (a) are provided. Thus, the protocol gateway 200 determines the data length of the multiplexed data unit having the greatest calculated probability value as the data length of the multiplexed data unit transmitted to the terminal device 100 (i.e., the data length matching the network state of the current satellite communication).
Specifically, the probability function may be, for example, a sigmoid function.
Wherein, the data length of the multiplexing data unitL 1 The calculation formula of the corresponding probability value is as follows formula 1:
Wherein, the liquid crystal display device comprises a liquid crystal display device,z 1 for multiplexing data length of data unitsL 1 The corresponding probability value is used to determine the probability value,y 1 for multiplexing data length of data unitsL 1 A corresponding linear regression function.
Data length with multiplexed data unitsL 1 The corresponding linear regression function is as follows equation 2:
Wherein, the liquid crystal display device comprises a liquid crystal display device,K 10 、K 11 、K 12 、K 13 、K 14 、K 15 、K 16 、K 17 for utilizing andL 1 the corresponding samples are trained parameters.
By introducing the formula (2) into the formula (1), the data length of the multiplexed data unit can be obtainedL 1 A corresponding probability value.
Data length with multiplexed data unitsL 1 The calculation formula of the corresponding probability value is as follows formula 3:
Wherein, the liquid crystal display device comprises a liquid crystal display device,z 2 for multiplexing data length of data unitsL 2 The corresponding probability value is used to determine the probability value,y 2 for multiplexing data length of data unitsL 2 A corresponding linear regression function.
Data length with multiplexed data unitsL 2 The corresponding linear regression function is as follows equation 4:
Wherein, the liquid crystal display device comprises a liquid crystal display device,K 20 、K 21 、K 22 、K 23 、K 24 、K 25 、K 26 、K 27 for utilizing andL 2 the corresponding samples are trained parameters.
By introducing the formula (4) into the formula (3), the data length of the multiplexed data unit can be obtainedL 2 A corresponding probability value.
By analogy, the M_PDU adjustment module in the protocol gateway 200 can calculate the data length of the multiplexed data units L 3 ~L m A corresponding probability value.
The m_pdu adjustment module in the protocol gateway 200 then multiplexes the data length of the data units fromL 3 ~L m Selecting the maximum probability value from the corresponding probability values, and selecting the data length of the multiplexing data unit corresponding to the maximum probability valueL 1 ~L m Is determined as the data length of the multiplexed data units transmitted to the terminal device 100.
For example, the M_PDU adjustment module in protocol gateway 200 calculates the data length of the multiplexed data unitsL 1 The corresponding probability value is 47%, and the data length of the multiplexing data unitL 2 The corresponding probability value is 53%, and the data length of the multiplexing data unitL 3 The corresponding probability value is 67% and the data length of the multiplexed data unitL 4 The corresponding probability value is 78%. From the above, it can be seen that the data length of the multiplexed data unitL 4 The corresponding probability value is the largest, the m_pdu adjustment module in the protocol gateway 200 determines the data length of the multiplexed data units transmitted to the terminal device 100 asL 4 (i.e. multiplexing data of data unitsLength ofL 4 Data length for most appropriate current network state transmission).
In addition, the data length adjustment module in the terminal device 100 adjusts the data length of the application data in the TCP packet according to the received data length of the multiplexed data unit after receiving the data length of the multiplexed data unit transmitted by the protocol gateway 200 (S706). Specifically, referring to fig. 2, 3 and 6, first, the protocol gateway 200 transmits the determined data length of the multiplexed data unit to the link layer in the terminal device 100 through the link layer. Then, the data length adjustment module in the terminal device 100 segments the byte stream of the application layer according to the determined data length of the multiplexed data unit, thereby generating application data corresponding to the data length of the multiplexed data unit and conforming to the data length output by the data length adjustment module, and adjusting the length of the application data in the TCP packet generated by the original TCP protocol.
Further, referring to fig. 2, after the data length adjustment module in the terminal device 100 adjusts the length of the application data in the TCP packet generated by the original TCP protocol, an IP packet is generated according to the adjusted TCP packet (S708).
Then, referring to fig. 2, the terminal device 100 generates an ethernet frame from the IP packet and transmits the ethernet frame to the protocol gateway 200. The protocol gateway 200 parses the IP packet from the ethernet frame after receiving the ethernet frame transmitted by the terminal device 100, and generates a CCSDS-space packet based on the IP packet (S710). Thus, since the data length of the CCSDS space packet generated by the protocol gateway 200 exactly corresponds to the data length of the multiplexed data unit, the CCSDS space packet may be padded into the multiplexed data unit without splitting the plurality of CCSDS space packets into the plurality of multiplexed data units or merging the plurality of CCSDS space packets into one multiplexed data unit.
As described in the background art, in the AOS protocol, the lengths of the m_pdu and the AOS space link frame are fixed, and the data length of the received IP packet is not fixed, so the length of the CCSDS space packet generated based on the IP packet is not fixed. Thus, it is necessary to split the CCSDS space packet into a plurality of m_pdus (when the length of the CCSDS space packet is greater than the length of the AOS space link frame), or to merge the plurality of CCSDS space packets into one m_pdu (when the length of the CCSDS space packet is less than the length of the AOS space link frame). Sometimes, the same CCSDS space packet is split into two different parts, and the two different parts are respectively filled into different m_pdus. These operations obviously increase the duration of protocol conversion and increase the delay in transmission.
In view of this, the present application provides a data transmission method based on the TCP/IP protocol and the CCSDS protocol. Since the protocol gateway 200 determines the data length of the multiplexed data unit according to the pre-acquired satellite communication parameters, the data length of the multiplexed data unit is most matched with the existing network state. In addition, since the terminal device 100 adjusts the length of application data in the TCP packet according to the received data length of the multiplexed data unit transmitted by the protocol gateway 200, the CCSDS space packet generated according to the TCP packet is exactly matched with the data length of the multiplexed data unit. Thus, the technical effect of being able to reduce the delay of transmission is achieved by the above operation. Further, the problem that in the prior art, because the data length of an IP data packet is not fixed, when the length of a CCSDS space packet is larger than the length of an AOS space link frame, the CCSDS space packet needs to be split into a plurality of M_PDU; when the length of the CCSDS space packet is smaller than the length of the AOS space link frame, an operation of combining a plurality of CCSDS space packets into one m_pdu is required, which increases the duration of protocol conversion, thereby increasing the technical problem of delay of the transmission process.
In addition, since the data length of the multiplexed data unit determined by the m_pdu adjusting module in the protocol gateway 200 is matched with the current satellite communication network, the length of the AOS space link frame can be exactly adapted to the current network state of satellite communication, so that the probability of error occurrence is reduced, and the CCSDS protocol is not required to continuously retransmit the data packet, thereby reducing the technical effect of transmission delay.
Optionally, the method further comprises: the terminal equipment generates a TCP message and generates an IP data packet according to the TCP message; the terminal equipment generates an Ethernet frame according to the IP data packet and transmits the Ethernet frame to the protocol gateway; and the protocol gateway splits the IP data packet from the received Ethernet frame and generates a CCSDS space packet according to the IP data packet.
Specifically, first, after the terminal device 100 generates a TCP packet, an IP header is added to the header of the TCP packet, thereby generating an IP packet. Then, the terminal device 100 adds an ethernet header to the header of the IP packet and an ethernet trailer to the trailer of the IP packet, thereby generating an ethernet frame.
Further, the terminal device 100 transmits the ethernet frame to the link layer of the protocol gateway 200 through the link layer.
Then, the protocol gateway 200 splits the IP packet from the received ethernet frame and adds the CCSDS space header and IPE to the header of the IP packet, thereby generating a CCSDS space packet.
Thus, the technical effect that the protocol gateway 200 can generate a CCSDS space packet from an IP data packet transmitted by the terminal device 100 is achieved through the above-described operation.
Optionally, the operation of the protocol gateway to determine the data length of the multiplexed data unit according to the satellite communication parameters includes: the protocol gateway preprocesses the satellite communication parameters and obtains first satellite characteristic parameters corresponding to the satellite communication parameters in the period; the protocol gateway acquires a second satellite characteristic parameter corresponding to the data length of the multiplexing data unit in the previous period; and the protocol gateway determines the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter, determines the probability corresponding to the similarity, and judges whether the data length of the multiplexing data unit needs to be adjusted according to the similarity.
Specifically, the protocol gateway 200 needs to pre-process the satellite communication parameters before determining the data length of the multiplexed data unit according to the satellite communication parameters. First, the protocol gateway 200 transmits a vector a= [ to the satellite communication parameters a 1 ,a 2 ,a 3 ,a 4 ,a 5 ,a 6 ,a 7 ] T Normalization processing is performed so that vector a= [ of satellite communication parameters ]a 1 ,a 2 ,a 3 ,a 4 ,a 5 ,a 6 ,a 7 ] T Vector b= [ into first satellite feature parameterb 1 ,b 2 ,b 3 ,b 4 ,b 5 ,b 6 ,b 7 ] T . Wherein the vector b= [ of the first satellite feature parametersb 1 ,b 2 ,b 3 ,b 4 ,b 5 ,b 6 ,b 7 ] T For indicating satellite characteristic parameters corresponding to satellite communication parameters within the present period.
The protocol gateway 200 then obtains a second satellite characteristic parameter for the last period used to determine the data length of the multiplexed data unit. For example, the vector of the second satellite characteristic parameter at the time of the last period for determining the data length of the multiplexed data unit is B' = [b 1 ',b 2 ',b 3 ',b 4 ',b 5 ',b 6 ',b 7 '] T 。
Further, the protocol gateway 200 calculates the similarity between the vector of the first satellite feature parameter and the vector of the second satellite feature parameter, and determines whether the data length of the multiplexed data unit needs to be adjusted according to the similarity. Specifically, the formula for calculating the similarity between the vector of the first satellite feature parameter and the vector of the second satellite feature parameter is:
Wherein, the liquid crystal display device comprises a liquid crystal display device,i=1 to 7. And wherein the first and second heat sinks are disposed,Xrepresenting the distance between the vector of the first satellite characteristic parameter and the vector of the second satellite characteristic parameter. When (when)XThe smaller the distance between the vector of the first satellite characteristic parameter and the vector of the second satellite characteristic parameter is, the higher the similarity between the vector of the first satellite characteristic parameter and the vector of the second satellite characteristic parameter is; when (when) XThe larger the distance between the vector of the first satellite feature parameter and the vector of the second satellite feature parameter is, the greater the distance is, and thus the lower the similarity between the vector of the first satellite feature parameter and the vector of the second satellite feature parameter is.
Further, after calculating the similarity between the vector of the first satellite feature parameter and the vector of the second satellite feature parameter, the protocol gateway 200 brings the similarity into the sigmoid function, so as to obtain a probability value corresponding to the similarity, where the specific calculation formula is as follows:
Wherein N is used to indicate a probability corresponding to a similarity of the vector of the first satellite feature parameter and the vector of the second satellite feature parameter.
Finally, the protocol gateway 200 compares the preset probability threshold with the probability corresponding to the similarity between the vector of the first satellite characteristic parameter and the vector of the second satellite characteristic parameter, and determines whether the data length of the multiplexing data unit needs to be adjusted according to the comparison result.
Therefore, the technical effect of analyzing the network environment of the space link more accurately is achieved through the operation.
Optionally, the protocol gateway determines the similarity between the first satellite feature parameter and the second satellite feature parameter, and determines whether the data length of the multiplexed data unit needs to be adjusted according to the similarity, including: the data length of the multiplexing data unit is not adjusted under the condition that the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is larger than or equal to a preset threshold value; and adjusting the data length of the multiplexing data unit under the condition that the similarity between the first satellite characteristic parameter and the second satellite characteristic parameter is smaller than a preset threshold value.
Specifically, when N is greater than or equal to 50%, the similarity between the vector of the first satellite characteristic parameter and the vector of the second satellite characteristic parameter is higher, so that the protocol gateway 200 does not need to adjust the data length of the multiplexing data unit; when N < 50%, the similarity between the vector of the first satellite characteristic parameter and the vector of the second satellite characteristic parameter is low, so that the protocol gateway 200 needs to adjust the data length of the multiplexed data unit.
Therefore, the technical effect of further reducing the waste of resources on the basis of ensuring the reduction of the transmission delay is achieved through the operation.
Further, referring to fig. 4, according to a second aspect of the present embodiment, there is provided a storage medium. The storage medium includes a stored program, wherein the method of any one of the above is performed by a processor when the program is run.
Thus, according to the present embodiment, a technical effect of reducing delay of transmission can be achieved.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present invention. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present invention.
From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.
Example 2
Fig. 8 shows a data transmission apparatus 800 based on the TCP/IP protocol and the CCSDS protocol according to the first aspect of the present embodiment, the apparatus 800 corresponding to the method according to the first aspect of embodiment 1. Referring to fig. 8, the apparatus 800 includes: a multiplexed data unit adjustment module 810, wherein the multiplexed data unit adjustment module 810 is configured to obtain satellite communication parameters at predetermined periods, wherein the satellite communication parameters are used to indicate a network state at the time of satellite communication; the multiplex data unit adjustment module 810 is configured to determine a data length of the multiplex data unit according to the satellite communication parameters; a data length adjustment module 820, wherein the data length adjustment module is configured to adjust a data length of application data in the TCP packet according to a received data length of the multiplexed data unit transmitted by the protocol gateway; the TCP packet generation module 830, where the TCP packet generation module is configured to generate an adjusted TCP packet, and generate an IP packet according to the TCP packet; and a CCSDS packet generating module 840, wherein the CCSDS generating module is configured to receive the IP data packet transmitted by the terminal device and generate a CCSDS spatial packet.
Optionally, the apparatus 800 comprises: the system comprises a TCP message generation module, a data transmission control protocol (IP) data packet generation module and a data Transmission Control Protocol (TCP) data packet generation module, wherein the TCP message generation module is configured to generate a TCP message and generate an IP data packet according to the TCP message; the system comprises an Ethernet frame generation module, a protocol gateway and a protocol data packet generation module, wherein the Ethernet frame generation module is configured to generate an Ethernet frame according to the IP data packet and transmit the Ethernet frame to the protocol gateway; and the IP data packet splitting module is configured to split the IP data packet from the received Ethernet frame and generate a CCSDS space packet according to the IP data packet.
Optionally, the multiplex data unit adjustment module 810 includes: the preprocessing sub-module is configured to preprocess satellite communication parameters and obtain first satellite characteristic parameters corresponding to the satellite communication parameters in the period; the second characteristic parameter determining module is configured to acquire a second satellite characteristic parameter corresponding to the data length of the multiplexing data unit in the previous period; and a similarity determination module, wherein the similarity determination module is configured to determine a similarity of the first satellite feature parameter and the second satellite feature parameter, determine a probability corresponding to the similarity, and determine whether the data length of the multiplexed data unit needs to be adjusted according to the similarity.
Optionally, the similarity determining module includes: the first adjustment module is configured to not adjust the data length of the multiplexing data unit when the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is greater than or equal to a preset threshold value; and a second adjustment module, wherein the second adjustment module is configured to adjust the data length of the multiplexed data unit if a probability corresponding to the similarity of the first satellite feature parameter and the second satellite feature parameter is less than a preset threshold.
Thus, according to the present embodiment, a technical effect of reducing delay of transmission can be achieved.
Example 3
Fig. 9 shows a data transmission apparatus 900 based on the TCP/IP protocol and the CCSDS protocol according to the first aspect of the present embodiment, the apparatus 900 corresponding to the method according to the first aspect of embodiment 1. Referring to fig. 9, the apparatus 900 includes: a processor 910; and a memory 920 coupled to the processor 910 for providing instructions to the processor 910 for processing the following processing steps: the protocol gateway acquires satellite communication parameters according to a preset period, wherein the satellite communication parameters are used for indicating the network state during satellite communication; the protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters; the terminal equipment adjusts the data length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway; the terminal equipment generates an adjusted TCP message and generates an IP data packet according to the TCP message; and the protocol gateway generates a CCSDS space packet according to the received IP data packet transmitted by the terminal equipment.
Thus, according to the present embodiment, a technical effect of reducing delay of transmission can be achieved.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, such as the division of the units, is merely a logical function division, and may be implemented in another manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A data transmission method based on a TCP/IP protocol and a CCSDS protocol, comprising:
the protocol gateway acquires satellite communication parameters according to a preset period, wherein the satellite communication parameters are used for indicating the network state during satellite communication;
the protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters;
the terminal equipment adjusts the data length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway;
the terminal equipment generates an adjusted TCP message and generates an IP data packet according to the TCP message;
the protocol gateway generates CCSDS space packet according to the received IP data packet transmitted by the terminal equipment, wherein
The protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters, and comprises the following steps:
the protocol gateway preprocesses the satellite communication parameters and obtains first satellite characteristic parameters corresponding to the satellite communication parameters in the period;
The protocol gateway acquires a second satellite characteristic parameter corresponding to the data length of the multiplexing data unit in the previous period;
a protocol gateway determines the similarity of the first satellite feature parameter and the second satellite feature parameter, determines a probability corresponding to the similarity, determines whether the data length of the multiplexing data unit needs to be adjusted according to the similarity, and wherein
A protocol gateway determines the similarity of the first satellite feature parameter and the second satellite feature parameter, and determines whether the data length of the multiplexed data unit needs to be adjusted according to the similarity, including:
the data length of the multiplexing data unit is not adjusted under the condition that the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is larger than or equal to a preset threshold value; and
and adjusting the data length of the multiplexing data unit under the condition that the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is smaller than a preset threshold value.
2. The method as recited in claim 1, further comprising:
The terminal equipment generates the TCP message and generates the IP data packet according to the TCP message;
generating an Ethernet frame by the terminal equipment according to the IP data packet, and transmitting the Ethernet frame to the protocol gateway; and
and the protocol gateway splits the IP data packet from the received Ethernet frame and generates the CCSDS space packet according to the IP data packet.
3. A data transmission apparatus based on a TCP/IP protocol and a CCSDS protocol, comprising:
a multiplexed data unit adjustment module, wherein the multiplexed data unit adjustment module is configured to acquire satellite communication parameters at a predetermined period, wherein the satellite communication parameters are used to indicate a network state at the time of satellite communication;
the multiplexing data unit adjusting module is configured to determine the data length of the multiplexing data unit according to the satellite communication parameters;
the data length adjusting module is configured to adjust the data length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway;
the TCP message generation module is configured to generate an adjusted TCP message and generate an IP data packet according to the TCP message;
A CCSDS packet generation module, wherein the CCSDS packet generation module is configured to receive IP data packets transmitted by the terminal equipment and generate CCSDS space packets, wherein
The multiplex data unit adjustment module includes:
the preprocessing sub-module is configured to preprocess the satellite communication parameters and obtain first satellite characteristic parameters corresponding to the satellite communication parameters in the period;
the second characteristic parameter determining module is configured to acquire a second satellite characteristic parameter corresponding to the data length of the multiplexing data unit in the previous period;
a similarity determination module configured to determine a similarity of the first satellite feature parameter and the second satellite feature parameter, determine a probability corresponding to the similarity, and determine whether the data length of the multiplexed data unit needs to be adjusted based on the similarity, and wherein
The similarity determination module comprises: the first adjustment module is configured to not adjust the data length of the multiplexing data unit when the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is greater than or equal to a preset threshold value; and
And the second adjustment module is configured to adjust the data length of the multiplexing data unit under the condition that the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is smaller than a preset threshold value.
4. A device according to claim 3, further comprising:
the TCP message generation module is configured to generate the TCP message and generate the IP data packet according to the TCP message;
an ethernet frame generation module, wherein the ethernet frame generation module is configured to generate an ethernet frame according to the IP packet, and transmit the ethernet frame to the protocol gateway; and
and the IP data packet splitting module is configured to split the IP data packet from the received Ethernet frame and generate the CCSDS space packet according to the IP data packet.
5. A storage medium comprising a stored program, wherein the method of any one of claims 1 to 2 is performed by a processor when the program is run.
6. A data transmission apparatus based on a TCP/IP protocol and a CCSDS protocol, comprising:
A processor; and
a memory, coupled to the processor, for providing instructions to the processor to process the following processing steps:
the protocol gateway acquires satellite communication parameters according to a preset period, wherein the satellite communication parameters are used for indicating the network state during satellite communication;
the protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters;
the terminal equipment adjusts the data length of application data in the TCP message according to the received data length of the multiplexing data unit transmitted by the protocol gateway;
the terminal equipment generates an adjusted TCP message and generates an IP data packet according to the TCP message;
the protocol gateway generates CCSDS space packet according to the received IP data packet transmitted by the terminal equipment, wherein
The protocol gateway determines the data length of the multiplexing data unit according to the satellite communication parameters, and comprises the following steps:
the protocol gateway preprocesses the satellite communication parameters and obtains first satellite characteristic parameters corresponding to the satellite communication parameters in the period;
the protocol gateway acquires a second satellite characteristic parameter corresponding to the data length of the multiplexing data unit in the previous period;
A protocol gateway determines the similarity of the first satellite feature parameter and the second satellite feature parameter, determines a probability corresponding to the similarity, determines whether the data length of the multiplexing data unit needs to be adjusted according to the similarity, and wherein
A protocol gateway determines the similarity of the first satellite feature parameter and the second satellite feature parameter, and determines whether the data length of the multiplexed data unit needs to be adjusted according to the similarity, including:
the data length of the multiplexing data unit is not adjusted under the condition that the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is larger than or equal to a preset threshold value; and
and adjusting the data length of the multiplexing data unit under the condition that the probability corresponding to the similarity of the first satellite characteristic parameter and the second satellite characteristic parameter is smaller than a preset threshold value.
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| CN112865853B (en) * | 2020-12-30 | 2023-01-10 | 广东省电信规划设计院有限公司 | Satellite data transmission parameter optimization method and device and communication system |
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| CN106571956A (en) * | 2016-10-25 | 2017-04-19 | 航天恒星科技有限公司 | Satellite networking routing protocol simulation system and method |
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