CN115459873A - Data transmission method, storage medium and equipment applied to network equipment - Google Patents

Data transmission method, storage medium and equipment applied to network equipment Download PDF

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Publication number
CN115459873A
CN115459873A CN202210993802.1A CN202210993802A CN115459873A CN 115459873 A CN115459873 A CN 115459873A CN 202210993802 A CN202210993802 A CN 202210993802A CN 115459873 A CN115459873 A CN 115459873A
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data
data packet
time
sending
tag information
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CN115459873B (en
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王继龙
张千里
祖林美
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Tsinghua University
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Tsinghua University
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0638Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658Clock or time synchronisation among packet nodes
    • H04J3/0661Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

A data transmission method, a storage medium and a device applied to a network device, wherein the method comprises the following steps: after receiving data packets from other equipment except the network equipment, acquiring label information; the tag information includes: time tag information; writing the acquired label information into the data packet; and forwarding the data packet carrying the label information.

Description

Data transmission method, storage medium and equipment applied to network equipment
Technical Field
The present disclosure relates to data transmission technologies, and in particular, to a data transmission method, a storage medium, and a device applied to a network device.
Background
With the popularization of the internet and the development of virtual reality technology, the world era is currently being entered. In the meta universe era, the online and offline are integrated, and the virtual space and the physical space are associated with each other, which will have great influence on multiple fields such as education, games, communication and the like, and also put forward new requirements for new information systems.
In the metastic network, a large number of sensors acquire multi-dimensional information such as vision, hearing, sensation and the like; the information receiver fuses and summarizes the information, and the effect which is comparable with the effect of being personally on the scene can be generated. In order to realize multidimensional information fusion, an information receiver needs to sort the received information according to the original sending sequence of the information. In order to help the information receiver to sort the received information according to the original sending sequence, the prior art mostly considers that the purpose is realized by the synchronization between the sensors.
However, the current sensors generally have no continuous energy, but need to consume more energy to realize time synchronization, and the time synchronization algorithm also needs more calculation overhead, so that research results in the direction of realizing sensor synchronization are limited.
Disclosure of Invention
The application provides a data transmission method, a storage medium and equipment applied to network equipment, which are beneficial to realizing that an information receiver sorts received information according to the original sending sequence of the information.
The application provides a data transmission method applied to network equipment, which comprises the following steps:
after receiving data packets from other equipment except the network equipment, acquiring label information; the tag information includes: time tag information;
writing the acquired label information into the data packet;
and forwarding the data packet carrying the label information.
As an example, the obtaining tag information includes:
and calculating the sending time of the data packet according to the recorded round-trip delay of data transmission between the network equipment and the other equipment and the acquired current timestamp, and taking the sending time of the data packet as the time tag information.
As an example, according to the recorded round trip delay of data transmitted between the network device and the other device, and the obtained current timestamp T At present Calculating the sending time of the data packet, comprising:
calculating the transmission time of the data packet according to the following formula:
T sending =T At present -RTT/2;
Wherein, T Sending And the RTT represents a round trip delay of data transmission between the network device and the other device.
As an example, the obtaining tag information further includes:
according to the recorded round-trip delay of data transmission between the network equipment and the other equipment and the obtained current timestamp T At present Before calculating the sending time of the data packet, updating and recording the round-trip delay;
the updating and recording the round trip delay comprises the following steps:
acquiring the time difference between the data sent by the network equipment and the response data for receiving the data;
updating the round trip delay according to RTT2= p t + (1-p) RTT 1;
wherein p is a constant, and 0-p-n-1; t represents a time difference between transmission of data and reception of response data of the network device, RTT2 represents a round trip delay after update, and RTT1 represents a round trip delay before update.
As an example, acquiring a time difference between transmission of data by the network device and reception of response data to the data includes:
when data is sent, judging whether handshake data is received after the data is sent, and if yes, recording a timestamp for sending the data;
recording a timestamp for receiving the handshake data after receiving the handshake data;
and determining the time difference according to the time stamp of the sending data and the time stamp of the receiving handshake data.
As an example, the tag information further includes: location tag information.
As an example, the method further comprises:
after receiving data packets from other devices except the network and before acquiring label information, judging whether the data packets need to be labeled according to a preset criterion, and acquiring the label information if necessary.
As an example, the preset criteria include:
labeling all data packets to be forwarded; or
Labeling a data packet which is to be forwarded and has a length smaller than a preset threshold value; or
And labeling the data packet which is to be forwarded and carries the preset field.
As an example, writing the obtained tag information into the data packet includes:
when the data packet is an IPv6 data packet, writing the acquired label information into a destination extension head of the IPv6 data packet;
when the data packet is a SRv data packet, writing the acquired label information into an expansion header of the SRv data packet;
and when the data packet is an IPv4 data packet, writing the acquired label information into an option field of the IPv4 data packet.
Embodiments of the present application also provide a computer readable storage medium storing one or more programs, which are executable by one or more processors to implement a method as described in any of the preceding.
An embodiment of the present application further provides a network device, where the network device includes a memory and a processor, where the memory stores a program, and the program, when read and executed by the processor, implements the method according to any one of the foregoing.
In the technical solution described in the embodiment of the present application, after writing time tag information into a received data packet from another device except the network device, the network device forwards the data packet, which is beneficial for a receiving terminal of the data packet to sequence the data packet according to the time tag information after receiving data carrying the time tag information.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The accompanying drawings are included to provide an understanding of the present disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the examples serve to explain the principles of the disclosure and not to limit the disclosure.
Fig. 1 is a flowchart of a data transmission method applied to a network device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a destination extension header format of an IPv6 data packet according to an embodiment of the present application;
fig. 3 is a schematic diagram of writing tag information in an extension header SRH of a SRv data packet according to an embodiment of the present application;
fig. 4 is a flowchart of another data transmission method applied to a network device according to an embodiment of the present application;
fig. 5 is a schematic diagram of a network architecture involved in an application example of the present application;
fig. 6 is a diagram of a network device structure according to an embodiment of the present application.
Detailed Description
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with, or instead of, any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed herein may also be combined with any conventional features or elements to form unique inventive aspects as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
An embodiment of the present application provides a data transmission method applied to a network device, and as shown in fig. 1, the method includes:
step S101, after receiving data packets from other equipment except the network equipment, acquiring label information;
the tag information includes: time tag information;
step S102, writing the acquired label information into the data packet;
step S103, forwarding operation is carried out on the data packet carrying the label information.
The network device related to the embodiment of the present application generally refers to a packet forwarding device, and the packet forwarding operation may be forwarding a packet from an extranet device to an intranet device, forwarding a packet from an intranet device to an extranet device, forwarding a packet between intranet devices, and the like.
In the embodiment of the application, the network device writes the time tag information into the received data packet from the other device and then forwards the data packet, which is beneficial for the receiving terminal of the data packet to sequence the data packet according to the time tag information after receiving the data carrying the time tag information.
In an exemplary embodiment, the types of the network device may include: the network switching equipment comprises network access equipment, routing equipment and network switching equipment; the type of the other device may be the same as or different from the type of the network device, for example, the other device may be an information acquisition device or an information sensing device.
In an exemplary embodiment, obtaining time tag information includes:
calculating the sending time of the data packet according to the recorded round-trip delay of data transmission between the network equipment and the other equipment and the acquired current timestamp, and taking the sending time of the data packet as the time tag information; the Round-trip delay for transmitting data between the present network device and the other device is generally expressed by using (Round-trip-TripTime, RTT).
In an exemplary embodiment, calculating the sending time of the data packet according to the recorded round trip delay of data transmitted between the network device and the other device and the obtained current timestamp includes:
calculating the transmission time of the data packet according to the following formula:
T sending =T At present -RTT/2;
Wherein, T Sending Indicating the transmission time of said data packet, RTT indicating the round trip delay of data transmission between the network device and said other device, T At present Indicating the current timestamp.
In an exemplary embodiment, obtaining the time tag information may further include:
according to the recorded round-trip delay of data transmission between the network equipment and other equipment and the acquired current timestamp, before the sending time of the data packet is calculated, the round-trip delay is updated and recorded;
the updating and recording the round trip delay comprises the following steps:
acquiring the time difference between the data sent by the network equipment and the response data for receiving the data;
updating the round trip time according to RTT2= p t + (1-p) RTT 1;
wherein p is a constant and 0<p is less than or equal to 1; t represents the time difference between the data transmission of the network equipment and the data receiving response data, RTT2 represents the updated round-trip delay, and RTT1 represents the round-trip delay before updating; RTT1 is initially 0.
In an exemplary embodiment, obtaining a time difference between sending data and receiving response data of the data by the network device includes:
when data is sent, judging whether handshake data is received after the data is sent, and if yes, recording a timestamp for sending the data;
recording a timestamp for receiving the handshake data after receiving the handshake data;
and determining the time difference according to the time stamp of the sending data and the time stamp of the receiving handshake data.
In an exemplary embodiment, the manner of determining whether handshake data will be received after sending data may include:
judging whether the sent data is Transmission Control Protocol (TCP) data, if so, judging whether a SYN mark and an ACK mark are set in the sent data, and if so, determining that handshake data can be received after the data is sent.
For TCP data, if a SYN mark and an ACK mark are set in the data, the data sending end and the data receiving end need to carry out three-time handshake operation; the handshake operation means that the sending end and the receiving end of the data process the SYN packet immediately, so that the time difference between the sending data of the network equipment and the receiving response data of the data can be acquired more accurately, and the accuracy of the obtained RTT is further ensured.
In an exemplary embodiment, the tag information may further include: location tag information.
The inventor of the application considers that in the metasma network, false information easily causes fraudulent behaviors in the metasma network, and the position reported by the terminal has the possibility of fraud, so that the embodiment of the application writes the position information in the data packet through the network equipment, thereby ensuring the reliability of the position information source and avoiding fraudulent behaviors caused by false information.
In an exemplary embodiment, obtaining location tag information includes:
the network equipment can obtain the code of the self position information through a Dynamic Host Configuration Protocol (DHCP) Protocol; the location information may include: any one or more of longitude information, latitude information, and altitude information.
In an exemplary embodiment, writing the obtained tag information to the data packet includes:
when the data packet is an IPv6 data packet, writing the acquired label information into a destination extension head of the IPv6 data packet; the destination extension header of the IPv6 data packet is in TLV format, as shown in fig. 2, for example, by writing time tag information, a predefined value may be set in the Type field (Type), 8 bytes may be set in the Length field (Length), and 32 bits of time tag information, such as a 32-bit second-level transmission time stamp and a 32-bit nanosecond-level transmission time stamp, may be filled in the value field (i.e., variable Length data field Variable Length data in the figure);
when the data packet is a SRv data packet, writing the acquired label information into an expansion header of the SRv data packet; for the SRv packet, taking the writing of time stamp information as an example, the time stamp information may be recorded in the last Optional Type Length Value field of its extension header SRH; when SRv6 is used for specific service control, corresponding information can be inserted in the Segment List; in the process of constructing the SRH by the source node, inserting an Optional Type Length Value field at the last, setting Type to be a Type Value corresponding to required information, and setting the initial Value of Length to be 0; when the network device receives the SRv data packet, the Variable length data is supplemented with actual time tag information, such as a 32-bit second-level time stamp and a 32-bit nanosecond-level time stamp, as shown in fig. 3;
and when the data packet is an IPv4 data packet, writing the acquired label information into an option field of the IPv4 data packet. The IPv4 option is also in TLV format, and for example, a predefined value may be set in the type field, 8 bytes may be set in the length field, and 32 bits of time tag information may be filled in the value field, such as 32 bits of second-level transmission time stamp and 32 bits of nanosecond-level transmission time stamp.
The writing of the position tag information to the data packet is similar to the writing of the time tag information to the data packet and will not be described in detail here.
An embodiment of the present application further provides a data transmission method applied to a network device, as shown in fig. 4, the method includes:
step S401 receives data packets from other devices except the network device;
the tag information includes: time tag information;
step S402, judging whether the data packet needs to be labeled according to a preset criterion, and if so, executing step S403; if not, directly executing step S405;
step S403, acquiring label information;
the tag information can be time tag information, or time tag information and position tag information;
step S404, writing the acquired label information into the data packet;
step S405 performs a forwarding operation on the packet.
In the embodiment of the application, the network equipment judges whether the received data packet is labeled or not, and only writes label information into the data packet when the label is required to be labeled, so that the flexibility of the network equipment in processing the data packet is improved.
In an exemplary embodiment, the preset criterion may include:
labeling all data packets to be forwarded; or
Labeling the data packet to be forwarded and with the length smaller than a preset threshold value, wherein the length of the labeled data packet can be prevented from exceeding the limit length of the data packet through the preset threshold value; or
Labeling a data packet which is to be forwarded and carries a preset field, wherein if the data packet is a data packet with a TSTAMP option, the TSTAMP option is used for recording the time of sending data by a sender; the time tag information is added into the data packet carrying the TSTAMP option, so that a data receiving party can conveniently evaluate the time synchronization condition of a sending party according to the time recorded by the TSTAMP option and the time recorded by the time tag information, if the time recorded by the TSTAMP option is the same as the time recorded by the time tag information, the sending party is indicated to realize the time synchronization, and if the time recorded by the TSTAMP option is not the same as the time recorded by the time tag information, the sending party is indicated to not realize the time synchronization.
The data transmission method described in the above embodiments of the present application will be described below with a specific application example. The network architecture involved in this application example is shown in fig. 5.
Step one, after receiving a data packet with a target address of a sensor A, the network equipment checks whether the data packet is a TCP data packet, if so, checks whether a SYN mark and an ACK mark are set in the data packet, and if so, executes step two; if not, directly executing the step three;
step two, the destination address of the data packet, namely the address of the sensor A, the destination port, namely the port of the sensor A, and the acquired current timestamp T At present = T1, which is stored in the status list of the network device, and sets the address of the sensor a and the measurement flag corresponding to the port of the sensor a in the status list as 1;
step three, sending the data packet to a sensor A;
step four, the network equipment receives the data packet from the sensor A, searches a state list according to the source address of the data packet, namely the address of the sensor A, and if the measurement mark corresponding to the address of the sensor A is 1, executes step five; if the measurement flag corresponding to the address of the sensor A is 0, executing the ninth step;
step five, according to the source address and the source port of the received data packet, finding the corresponding timestamp T1 from the state list, and according to the obtained current timestamp T At present = T2, calculating a time difference T between the sending of the data packet and the receiving of the response data of the data packet by the network device, where T = T2-T1;
step six, updating and recording the round-trip delay according to RTT2= p × t + (1-p) × RTT1, and setting the address of the sensor A and the measurement mark corresponding to the port of the sensor A as 0;
p is constant and 0<p is less than or equal to 1; RTT2 represents the round trip delay after updating, and RTT1 represents the round trip delay before updating; the initial value of RTT1 is 0;
step seven, according to T Sending -T2-RTT/2 estimates the transmission time of the received packet;
step eight, converting the T Sending Writing a data packet;
step nine, the data packet is forwarded to the network server.
Embodiments of the present application also provide a computer-readable storage medium storing one or more programs, which are executable by one or more processors to implement the method according to any of the foregoing embodiments.
An embodiment of the present application further provides a network device, as shown in fig. 6, the network device includes a memory 601 and a processor 602, where the memory 601 stores a program, and when the program is read and executed by the processor, the method according to any of the foregoing embodiments is implemented.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, or suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

Claims (11)

1. A data transmission method applied to a network device, the method comprising:
after receiving data packets from other equipment except the network equipment, acquiring label information; the tag information includes: time tag information;
writing the acquired label information into the data packet;
and forwarding the data packet carrying the label information.
2. The method of claim 1,
the acquiring of the tag information includes:
and calculating the sending time of the data packet according to the recorded round-trip delay of data transmission between the network equipment and the other equipment and the acquired current timestamp, and taking the sending time of the data packet as the time tag information.
3. The method of claim 2,
according to the recorded round-trip delay of data transmission between the network equipment and the other equipment and the obtained current timestamp T At present Calculating the sending time of the data packet, comprising:
calculating the transmission time of the data packet according to the following formula:
T sending =T At present -RTT/2;
Wherein, T Sending And the RTT represents a round trip delay of data transmission between the network device and the other device.
4. The method of claim 3,
the acquiring tag information further includes:
according to the recorded round-trip delay of data transmission between the network equipment and the other equipment and the obtained current timestamp T At present Updating and recording the round trip delay before calculating the sending time of the data packet;
the updating and recording the round trip delay comprises the following steps:
acquiring the time difference between the data sent by the network equipment and the response data for receiving the data;
updating the round trip delay according to RTT2= p t + (1-p) RTT 1;
wherein p is a constant, and 0-p-n-1; t represents a time difference between transmission of data and reception of response data of the network device, RTT2 represents the updated round trip delay, and RTT1 represents the round trip delay before updating.
5. The method of claim 4,
the time difference of the response data of the network equipment for sending the data and receiving the data is obtained, and the time difference comprises the following steps:
when data is sent, whether handshake data can be received after the data is sent is judged, and if yes, a timestamp for sending the data is recorded;
recording a timestamp for receiving the handshake data after receiving the handshake data;
and determining the time difference according to the time stamp of the sending data and the time stamp of the receiving handshake data.
6. The method of claim 1,
the tag information further includes: location tag information.
7. The method of claim 1 or 6, further comprising:
after receiving data packets from other devices except the network and before acquiring label information, judging whether the data packets need to be labeled according to a preset criterion, and acquiring the label information if necessary.
8. The method of claim 7,
the preset criteria include:
labeling all data packets to be forwarded; or
Labeling a data packet which is to be forwarded and has a length smaller than a preset threshold value; or
And labeling the data packet which is to be forwarded and carries the preset field.
9. The method according to any one of claims 1 to 8,
writing the obtained tag information into the data packet, including:
when the data packet is an IPv6 data packet, writing the acquired label information into a destination extension head of the IPv6 data packet;
when the data packet is a SRv data packet, writing the acquired label information into an expansion header of the SRv data packet;
and when the data packet is an IPv4 data packet, writing the acquired label information into an option field of the IPv4 data packet.
10. A computer readable storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the method of any of claims 1 to 9.
11. A network device comprising a memory and a processor, the memory storing a program that, when read and executed by the processor, implements the method of any one of claims 1 to 9.
CN202210993802.1A 2022-08-18 2022-08-18 Data transmission method, storage medium and device applied to network device Active CN115459873B (en)

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