CN112583472B - Multicast file sending, receiving and transmitting method and device for batch upgrading satellite equipment - Google Patents

Multicast file sending, receiving and transmitting method and device for batch upgrading satellite equipment Download PDF

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CN112583472B
CN112583472B CN202011574127.6A CN202011574127A CN112583472B CN 112583472 B CN112583472 B CN 112583472B CN 202011574127 A CN202011574127 A CN 202011574127A CN 112583472 B CN112583472 B CN 112583472B
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error correction
signaling
multicast
remote station
central
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CN112583472A (en
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靳年鑫
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Sichuan Andi Technology Industrial Co Ltd
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Sichuan Andi Technology Industrial Co Ltd
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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
    • 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
    • H04B7/18519—Operations control, administration or maintenance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0813—Configuration setting characterised by the conditions triggering a change of settings
    • H04L41/082—Configuration setting characterised by the conditions triggering a change of settings the condition being updates or upgrades of network functionality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/104—Peer-to-peer [P2P] networks
    • H04L67/1074—Peer-to-peer [P2P] networks for supporting data block transmission mechanisms
    • H04L67/1078—Resource delivery mechanisms
    • H04L67/1085—Resource delivery mechanisms involving dynamic management of active down- or uploading connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/141—Setup of application sessions
    • 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]
    • H04L69/164—Adaptation or special uses of UDP protocol
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The invention provides a method and a device for sending, receiving and transmitting multicast files of batch upgrade satellite equipment, wherein the method for sending the multicast files is applied to a central station and comprises the following steps: acquiring an upgrade package file according to a remote station equipment list to be upgraded; transmitting an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number; after a predetermined time interval, establishing a multicast UDP connection based on a multicast IP and a data transmission port number with a remote station present in a list of remote station devices; the upgrade package file is fragmented according to the default fragmentation size, and then a fragmentation data message is sent to a remote station which establishes multicast UDP connection; after all the fragment data message transmission is completed, transmitting error correction signaling to collect the fragment data message information needing to be retransmitted from the remote station establishing the multicast UDP connection; after a preset time interval, retransmitting the fragmented data message needing to be retransmitted; and sending an ending instruction to end the transmission.

Description

Multicast file sending, receiving and transmitting method and device for batch upgrading satellite equipment
Technical Field
The invention relates to satellite communication technology, in particular to technology for bearing Ethernet messages in satellite channels, in particular to a method and a device for sending, receiving and transmitting multicast files of batch upgrading satellite equipment.
Background
The satellite network topology is shown in fig. 1, in the satellite frequency division system network, a central station and a remote station are both one-transmitting-multiple-receiving devices, and the central station is responsible for transferring data messages from satellites and controlling the remote station. In the above system, the central station needs to remotely upgrade a plurality of remote station devices, and the central station needs to transmit an upgrade package file to the remote station via an air interface and execute an upgrade instruction. Due to the problem of time delay of a space transmission link, when a typical tcp protocol performs file transmission, the transmission efficiency is lower; in the case of broadcasting file data by using the UDP broadcasting method, the overall transmission efficiency is improved, but there is no reliability guarantee.
Disclosure of Invention
The invention mainly aims at the defects and the shortcomings of the related prior art, and provides a method and a device for sending, receiving and transmitting multicast files of batch upgrading satellite equipment, which can effectively solve the problem of efficiency of remote upgrading of a plurality of remote station equipment and save labor and time cost.
In order to achieve the above object, the present invention adopts the following technique:
the multicast file sending method for upgrading the satellite equipment in batches is applied to a central station and comprises the following steps:
acquiring an upgrade package file according to a remote station equipment list to be upgraded;
transmitting an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number;
after a predetermined time interval, establishing a multicast UDP connection based on a multicast IP and a data transmission port number with a remote station present in a list of remote station devices;
the upgrade package file is fragmented according to the default fragmentation size, and then a fragmentation data message is sent to a remote station which establishes multicast UDP connection;
after all the fragment data message transmission is completed, transmitting error correction signaling to collect the fragment data message information needing to be retransmitted from the remote station establishing the multicast UDP connection;
after a preset time interval, retransmitting the fragmented data message needing to be retransmitted;
and sending an ending instruction to end the transmission.
Further, calculating the total number of message fragments of the upgrade package file according to the default fragment size for the obtained upgrade package file, and packaging an open type signaling, an end type signaling and an error correction signaling;
The open-type signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a default fragment size, a multicast IP, a data transmission port number and a remote station equipment list;
the ending signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and fragments to be corrected, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data;
after the upgrade package file is fragmented according to the default fragmentation size, the fragmented data message carries the fragmentation sequence number, the effective data length and the transmission content.
Further, after all the fragmented data messages are transmitted, error correction processing is executed according to preset error correction times, and each error correction processing includes:
transmitting error correction signaling with the type of error correction signaling as error correction signaling for starting error correction;
collecting the information of the fragment data message needing to be retransmitted from a remote station which establishes multicast UDP connection, wherein the retransmitted fragment data message is the fragment data message needing to be received but not received and fed back by the remote station through error correction signaling with error correction signaling type being error correction data;
after a preset time interval, retransmitting the fragmented data message needing retransmission to finish one-time error correction;
After the preset error correction times are all completed, transmitting error correction signaling with the error correction signaling type of ending error correction, and ending error correction;
sending ending signaling to enable the remote station to close the multicast UDP connection and end the transmission;
and sending an upgrade instruction to enable the remote station to complete upgrade according to a received upgrade package file, wherein the received upgrade package file refers to a set of fragmented data messages received by the remote station.
The multicast file transmitting device for batch upgrading of the satellite equipment comprises a signaling module and a multicast protocol module which are arranged in a central station, wherein the central station and a plurality of remote stations are simultaneously in a satellite frequency division system network;
the signaling module is used for acquiring a remote station equipment list to be upgraded;
the multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the signaling module;
the signaling module is used for packaging open type signaling according to the upgrade package file acquired by the multicast protocol module, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number;
the multicast protocol module is used for sending the open-type signaling packaged by the signaling module to each remote station; and for establishing a multicast UDP connection with a remote station present in the list of remote station devices based on the multicast IP and the data transmission port number after a predetermined time interval; the method comprises the steps of establishing a multicast UDP connection, wherein the multicast UDP connection is used for establishing a multicast UDP connection, and sending a remote station to the remote station according to the multicast UDP connection after the upgrade packet file is fragmented according to the default fragment size; and is used for sending error correction signaling after finishing all the transmission of the fragmented data message, in order to collect the fragmented data message information needing retransmission from the remote station which establishes the multicast UDP connection; and is used for retransmitting the fragment data message needing to be retransmitted after a preset time interval; and is used for sending an ending instruction to end the transmission.
Further, the signaling module is used for calculating the total number of message fragments of the upgrade package file according to the upgrade package file and the default fragment size, and packaging the open signaling, the end signaling and the error correction signaling;
the open-type signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a default fragment size, a multicast IP, a data transmission port number and a remote station equipment list;
the ending signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and fragments to be corrected, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data;
after the multicast protocol module fragments the upgrade package file according to the default fragment size, the fragmented data message carries the fragment sequence number, the effective data length and the transmission content.
Further, the multicast protocol module is configured to perform error correction processing according to a preset error correction number after all the fragmented data packets are transmitted, where each error correction processing includes:
transmitting error correction signaling with the type of error correction signaling as error correction signaling for starting error correction;
collecting the information of the fragment data message needing to be retransmitted from a remote station which establishes multicast UDP connection, wherein the retransmitted fragment data message is the fragment data message needing to be received but not received and fed back by the remote station through error correction signaling with error correction signaling type being error correction data;
After a preset time interval, retransmitting the fragmented data message needing retransmission to finish one-time error correction;
the multicast protocol module is used for sending error correction signaling with the type of error correction signaling being error correction ending after the preset error correction times are all completed, and ending the error correction; and is used for sending the ending signaling after finishing error correction, so that the remote station closes the multicast UDP connection and ends the transmission;
and the signaling module is used for sending an upgrade instruction after the multicast protocol module finishes the transmission, so that the remote station finishes upgrading according to a received upgrade package file, wherein the received upgrade package file is a set of fragmented data messages received by the remote station.
The multicast file receiving method for upgrading the satellite equipment in batches is applied to a remote station and comprises the following steps:
receiving an open-type signaling sent by a central station, wherein the open-type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open-type signaling is obtained by encapsulating an upgrade package file obtained by the central station according to the remote station equipment list which needs to be upgraded;
judging whether the user exists in a remote station equipment list, if so, establishing multicast UDP connection with a central station based on multicast IP and a data transmission port number;
The method comprises the steps that a multicast UDP connection is used for receiving a fragmentation data message sent by a central station, wherein the sent fragmentation data message is obtained by the central station in a fragmentation way according to a default fragmentation size;
receiving error correction signaling sent by a central station, and feeding back to the central station the fragment data message information needing to be retransmitted, wherein the retransmitted fragment data message information is the fragment data message needing to be received but not received;
after a preset time interval, receiving the retransmitted fragment data message sent by the central station;
and receiving an ending instruction sent by the central station, and ending the transmission.
The multicast file receiving device for batch upgrading of satellite equipment comprises a multicast protocol module arranged at each remote station, wherein each remote station and a central station are both in a star satellite frequency division system network;
the multicast protocol module is used for receiving an open type signaling sent by the central station, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number, and the open type signaling is obtained by encapsulating an upgrade package file obtained by the central station according to the remote station equipment list which is required to be upgraded;
and is used for judging whether oneself exists in the far-end station apparatus tabulation, if exist, based on multicasting IP and data transmission port number, set up multicasting UDP connection with the central station;
The method comprises the steps that a central station receives a fragmentation data message sent by the central station through multicast UDP connection, and the sent fragmentation data message is obtained by fragmenting an upgrade packet file according to a default fragmentation size by the central station;
the method is used for receiving error correction signaling sent by the central station and feeding back the fragment data message information needing to be retransmitted to the central station, wherein the retransmitted fragment data message information is a fragment data message which needs to be received but not received;
and is used for receiving the retransmitted fragmented data message sent by the central station after a preset time interval;
and is configured to receive an end command sent by the central station, so as to end the transmission.
The multicast file transmission method for batch upgrade of satellite equipment is applied to a central station and a plurality of remote stations which are in a star satellite frequency division system network, and comprises the following steps:
the central station acquires an upgrade package file according to a remote station equipment list which is required to be upgraded;
the central station sends an open-type signaling to each remote station, wherein the open-type signaling comprises a remote station equipment list, multicast IP and a data transmission port number;
the remote station judges whether the remote station exists in a remote station equipment list according to the received open-type signaling, if so, the remote station establishes multicast UDP connection with the central station based on multicast IP and a data transmission port number;
The central station fragments the upgrade package file according to the default fragment size, and sends a fragment data message to a remote station which establishes multicast UDP connection;
the remote station receives the fragmented data message and ignores the repeatedly received fragmented data message;
after finishing the transmission of all the fragment data messages, the central station sends error correction signaling;
the remote station receives the error correction signaling and feeds back the received but not received fragment data message to the central station according to the information of the fragment data message to be retransmitted;
after a preset time interval, the central station retransmits the fragment data message needing to be retransmitted;
the remote station receives the retransmitted fragment data message;
the central station sends an ending instruction;
and the remote station closes the multicast UDP connection according to the received ending instruction to end the transmission.
A multicast file transmission device for upgrading satellite equipment in batches includes: the central station and the remote stations are in a star satellite frequency division system network;
the central signaling module is used for acquiring a remote station equipment list to be upgraded;
The central multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the central signaling module;
the central signaling module is used for packaging an open type signaling according to the upgrade package file acquired by the central multicast protocol module, wherein the open type signaling comprises a remote station device list, multicast IP and a data transmission port number;
the central multicast protocol module is used for sending the open-type signaling to each remote station;
the remote multicast protocol module is used for receiving the open-type signaling, judging whether the remote station where the remote multicast protocol module is located exists in a remote station equipment list, and if so, establishing multicast UDP connection with the central multicast protocol module based on multicast IP and data transmission port numbers;
the central multicast protocol module is used for fragmenting the upgrade package file according to the default fragment size and sending fragment data messages to the remote multicast protocol module which establishes multicast UDP connection;
the remote multicast protocol module is used for receiving the fragmented data message and ignoring the repeatedly received fragmented data message;
the central multicast protocol module is used for transmitting error correction signaling after finishing the transmission of all the fragmented data messages;
the remote multicast protocol module is used for receiving error correction signaling and feeding back the received but not received fragmented data message to the central multicast protocol module by the information of the fragmented data message which needs to be retransmitted;
The central multicast protocol module is used for retransmitting the fragment data message needing to be retransmitted after a preset time interval;
the remote multicast protocol module is used for receiving the retransmitted fragmented data message;
the central multicast protocol module is used for sending an ending instruction;
and the remote multicast protocol module is used for receiving the end instruction, closing the multicast UDP connection and ending the transmission.
The invention has the beneficial effects that:
1. the transmission protocol uses multicast mode transmission, can upgrade a plurality of devices at a time, reduces the occupation time and frequency of forward bandwidth, avoids the problem of repeated transmission of upgrade packets, and improves the upgrade efficiency of remote station devices.
2. The transmission protocol adopts an increment and multiple error correction mechanism, so that invalid transmission of data is reduced, and retransmission of the complete upgrade packet caused by transmission errors is avoided.
3. The error correction times in the transmission protocol can be configured, and can be adjusted according to the error rate of the forward link, so that the method is suitable for different link environments and ensures the transmission reliability.
4. After parameter configuration is completed, one-key type upgrading can be supported, and manpower consumption and operation and maintenance cost are effectively reduced.
Drawings
The drawings described herein are for illustration of selected embodiments only and not all possible implementations, and are not intended to limit the scope of the invention.
Fig. 1 is a network topology of a satellite-based satellite frequency division system.
Fig. 2 is a flowchart of a multicast file sending method for batch upgrade of satellite devices according to an embodiment of the present application.
Fig. 3 is a block diagram of a multicast file sending device for batch upgrade of satellite devices according to an embodiment of the present application.
Fig. 4 is a flowchart of a multicast file receiving method for batch upgrade of satellite devices according to an embodiment of the present application.
Fig. 5 is a block diagram of a multicast file receiving device for batch upgrade of satellite devices according to an embodiment of the present application.
Fig. 6 is a flowchart of a multicast file transmission method for batch upgrade of satellite devices according to an embodiment of the present application.
Fig. 7 is a block diagram of a multicast file transmission device for batch upgrade of satellite devices according to an embodiment of the present application.
Fig. 8 is a schematic diagram of a multicast file protocol transmission flow according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings, but the described embodiments of the present invention are some, but not all embodiments of the present invention.
The application scenario of the embodiment of the application is a star-shaped satellite frequency division system network as shown in fig. 1, the central station and the remote station are all one-transmitting-multiple-receiving devices, and the central station is responsible for transferring data messages from satellites and controlling the remote station.
Example 1
The example provides a multicast file sending method for batch upgrading of satellite equipment, which is applied to a central station.
As shown in fig. 2, a flowchart of a method for sending a multicast file in this example includes the following steps:
s1: and selecting a plurality of remote station devices to be upgraded at the central station according to the user, and generating and obtaining a remote station device list to be upgraded in response to an upgrade execution instruction initiated by the user.
S2: and obtaining an upgrade package file.
And further acquiring/preparing an upgrade package file for upgrading the remote station equipment according to the remote station equipment list required to be upgraded.
And calculating the total number of message fragments of the upgrade package file according to the default fragment size for the obtained upgrade package file. The tile default size may be set to 512 bytes.
S3: and sending open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number. The open-type signaling is obtained by the central station according to the upgrade package file.
The open signaling includes file name, file length, md5 value, total number of message fragments, default fragment size, multicast IP, data transmission port number, remote station device list.
In addition to encapsulating the open-type signaling, the central station also encapsulates the end-type signaling and error correction signaling for use. The ending signaling includes file name, file length, md5 value, multicast IP, data transport port number. The error correction signaling comprises an error correction signaling type, a remote station equipment list and a to-be-error-corrected fragment, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data.
S4: after a predetermined time interval, e.g. after waiting 2s, the central station establishes a multicast UDP connection based on multicast IP and data transmission port numbers with the remote stations present in the list of remote station devices.
For example, the transport protocol defaults to using a multicast IP of 224.0.0.1 and a data transport port number of 8888, and is used as transport management signaling, the remote station may establish a UDP connection using the 8888 port number and join the multicast IP group 224.0.0.1.
S5: and fragmenting the upgrade package file according to the default fragment size, and then sending a fragment data message to a remote station which establishes multicast UDP connection. After the upgrade package file is fragmented according to the default fragmentation size, the fragmented data message carries the fragmentation sequence number, the effective data length and the transmission content.
S6: after all the fragment data message transmission is completed, an error correction signaling is sent to collect the fragment data message information needing to be retransmitted from the remote station which establishes the multicast UDP connection.
Specifically, after all the fragmented data messages are transmitted, according to the preset error correction times, generally 2-3 times can meet most of link requirements, and error correction processing is performed, wherein each error correction processing includes:
transmitting error correction signaling with the type of error correction signaling as error correction signaling for starting error correction;
collecting the information of the fragment data message needing to be retransmitted from a remote station which establishes multicast UDP connection, wherein the retransmitted fragment data message is the fragment data message needing to be received but not received and fed back by the remote station through error correction signaling with error correction signaling type being error correction data;
s7: after a predetermined time interval, for example, after waiting for 5 seconds, the fragmented data message that needs to be retransmitted is retransmitted, and one error correction is completed.
And after the preset error correction times are all completed, transmitting error correction signaling with the error correction signaling type of ending error correction, and ending error correction.
S8: and sending ending signaling to enable the remote station to close the multicast UDP connection and end the transmission.
After the transmission is completed, the central station sends an upgrade instruction to enable the remote station to complete the upgrade according to a received upgrade package file, wherein the received upgrade package file refers to a set of fragmented data messages received by the remote station.
Example two
The example provides a multicast file sending device for batch upgrade of satellite equipment, as shown in fig. 3, which comprises a signaling module and a multicast protocol module arranged in a central station, wherein the central station and a plurality of remote stations are in a star satellite frequency division system network.
Description of the working mode in this example:
first, the signaling module obtains a list of remote station devices that need to be upgraded. Specifically, a plurality of remote station devices to be upgraded are selected at a central station according to a user, and a remote station device list to be upgraded is generated and obtained in response to an upgrade execution instruction initiated by the user.
And then, the multicast protocol module acquires the upgrade package file according to the remote station equipment list acquired by the signaling module.
And then, the signaling module calculates the total number of message fragments of the upgrade package file according to the default fragment size according to the upgrade package file, and encapsulates the open signaling, the end signaling and the error correction signaling.
The open signaling includes file name, file length, md5 value, total number of message fragments, default fragment size, multicast IP, data transmission port number, remote station device list.
The ending signaling includes file name, file length, md5 value, multicast IP, data transport port number.
The error correction signaling comprises an error correction signaling type, a remote station equipment list and a to-be-error-corrected fragment, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data.
And then, the multicast protocol module sends the open signaling encapsulated by the signaling module to each remote station.
The multicast protocol module then establishes a multicast UDP connection based on the multicast IP and data transport port number with the remote station present in the list of remote station devices after a predetermined time interval, such as after waiting for 2 s.
And then, the multicast protocol module fragments the upgrade package file according to the default fragment size and then sends a fragment data message to the remote station which establishes multicast UDP connection. The fragmented data message after fragmentation carries the sequence number of fragments, the effective data length and the transmission content.
And then, the multicast protocol module sends error correction signaling after completing the transmission of all the fragment data messages so as to collect the fragment data message information needing to be retransmitted from the remote station which establishes the multicast UDP connection.
And then, the multicast protocol module retransmits the fragment data message needing to be retransmitted after a preset time interval.
Then, the multicast protocol module sends an end command to end the transmission.
As a further specific working mode:
after all the fragmented data messages are transmitted, the multicast protocol module executes error correction processing according to preset error correction times, such as 2-3 times, and each error correction processing comprises:
transmitting error correction signaling with the type of error correction signaling as error correction signaling for starting error correction;
Collecting the information of the fragment data message needing to be retransmitted from a remote station which establishes multicast UDP connection, wherein the retransmitted fragment data message is the fragment data message needing to be received but not received and fed back by the remote station through error correction signaling with error correction signaling type being error correction data;
and after a preset time interval of 5s, retransmitting the fragmented data message needing retransmission to finish one-time error correction.
And after the preset error correction times are all completed, the multicast protocol module sends error correction signaling with the error correction signaling type of ending error correction, and the error correction is ended.
After error correction is finished, an ending signaling is sent to enable the remote station to close the multicast UDP connection and end the transmission;
after the multicast protocol module finishes the transmission, the signaling module sends an upgrade instruction to enable the remote station to complete the upgrade according to a received upgrade package file, wherein the received upgrade package file refers to a set of fragmented data messages received by the remote station.
Example III
The present example provides a multicast file receiving method for batch upgrade of satellite devices, which is applied to a remote station, and the flowchart is shown in fig. 4, and includes the following steps:
s1: and receiving an open-type signaling sent by the central station, wherein the open-type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open-type signaling is obtained by encapsulating an upgrade package file obtained by the central station according to the remote station equipment list which is required to be upgraded.
Specific open signaling includes file name, file length, md5 value, total number of message fragments, default fragment size, multicast IP, data transmission port number, remote station device list.
S2: judging whether the user exists in a remote station equipment list, if so, establishing multicast UDP connection with the central station based on multicast IP and data transmission port number.
S3: and receiving the fragmented data message sent by the central station through multicast UDP connection, wherein the sending fragmented data message is obtained by the central station by fragmenting the upgrade packet file according to the default fragment size.
Specifically, the fragmented data message after fragmentation carries a fragmentation sequence number, an effective data length and transmission content.
S4: and receiving error correction signaling sent by the central station.
Specifically, error correction signaling of which the type is error correction signaling for starting error correction is transmitted.
Specifically, the error correction signaling is encapsulated by the central station, and includes an error correction signaling type, a remote station device list, and a fragment to be error corrected, where the error correction signaling type includes start error correction, end error correction, and error correction data.
S5: and feeding back the fragment data message information needing to be retransmitted to the central station, wherein the retransmitted fragment data message information is the fragment data message needing to be received but not received.
Collecting the information of the fragment data message needing to be retransmitted from a remote station which establishes multicast UDP connection, wherein the retransmitted fragment data message is the fragment data message needing to be received but not received and fed back by the remote station through error correction signaling with error correction signaling type being error correction data;
s6: and after a preset time interval of 5s, receiving the retransmitted fragmented data message sent by the central station, and completing one-time error correction.
Specifically, the error correction signaling sent by the central station is received multiple times, that is, S4 to S6 are repeatedly executed for multiple times, for example, 2 to 3 times.
S7: and after the error correction is completed, receiving an ending instruction sent by the central station, and ending the transmission.
After the transmission is completed, further when an upgrade instruction sent by the central station is received, the upgrade is completed according to a received upgrade package file, wherein the received upgrade package file refers to a received set of fragmented data messages.
Example IV
The embodiment provides a multicast file receiving device for batch upgrade of satellite equipment, the structural block diagram of which is shown in fig. 5, and the multicast file receiving device comprises a multicast protocol module arranged at each remote station, wherein each remote station and a central station are in a star satellite frequency division system network.
The working mode is described as follows:
Firstly, a multicast protocol module receives an open type signaling sent by a central station, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number, and the open type signaling is obtained by encapsulating an upgrade package file obtained by the central station according to the remote station equipment list which is required to be upgraded.
Then, the multicast protocol module judges whether the multicast protocol module exists in a remote station equipment list, if so, the multicast protocol module establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number.
And then, the multicast protocol module receives the fragmented data message sent by the central station through multicast UDP connection, and the sent fragmented data message is obtained by the central station by fragmenting the upgrade package file according to the default fragment size.
Then, the multicast protocol module receives the error correction signaling sent by the central station and feeds back the fragment data message information needing to be retransmitted to the central station, wherein the retransmitted fragment data message information is the fragment data message needing to be received but not received;
then, after a preset time interval, the multicast protocol module receives the retransmitted fragment data message sent by the central station;
then, the multicast protocol module receives an end instruction sent by the central station to end the transmission.
As a more detailed embodiment, as shown in fig. 5, the multicast file receiving apparatus of this example further includes a signaling module provided at each remote station, where the signaling module is connected to the multicast protocol module.
The multicast protocol module feeds back the receiving result to the signaling module. After the multicast protocol module finishes receiving and transmitting the upgrade file packet, the signaling module responds to an upgrade instruction sent by the central station and performs upgrade on the remote station equipment according to the upgrade file packet.
Example five
The example provides a multicast file transmission method for batch upgrade of satellite equipment, which is applied to a central station and a plurality of remote stations which are in a star satellite frequency division system network, and the flow is shown in fig. 6, and comprises the following steps:
firstly, the central station acquires an upgrade package file according to a remote station equipment list which is required to be upgraded.
Specifically, the central station selects a plurality of remote station devices to be upgraded at the central station according to a user, responds to an upgrade execution instruction initiated by the user, generates and obtains a remote station device list to be upgraded, and obtains an upgrade package file according to the upgrade execution instruction.
Then, the central station sends an open-type signaling to each remote station, wherein the open-type signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a fragment size, a multicast IP, a data transmission port number and a device group. The fragments default size is 512Bytes.
And then, the remote station judges whether the remote station exists in a remote station equipment list according to the received open signaling, and if the remote station exists, the remote station establishes multicast UDP connection with the central station based on the multicast IP and the data transmission port number.
And then, the central station fragments the upgrade package file according to the default fragment size, and sends a fragment data message to the remote station which establishes the multicast UDP connection. The fragment data message carries fragment sequence number, effective data length and transmission content.
And then, the remote station receives the fragmented data message and ignores the repeatedly received fragmented data message.
And then, the central station transmits error correction signaling after finishing the transmission of all the fragmented data messages.
Then, the remote station receives the error correction signaling and feeds back the received but not received fragment data message to the central station in order to retransmit the fragment data message information.
Then, the central station retransmits the fragmented data message requiring retransmission after a predetermined time interval.
The remote station then receives the retransmitted fragmented data messages.
The central station then transmits an end command.
And then, the remote station closes the multicast UDP connection according to the received ending instruction to end the transmission.
The central station then issues an upgrade instruction.
And then, the remote station upgrades according to the received upgrading instruction and the received fragment data message.
Example six
The embodiment provides a multicast file transmission device for batch upgrade of satellite devices, the structure of which is shown in fig. 7, comprising: the central station and the remote stations are in a star satellite frequency division system network.
The central signaling module is responsible for indicating the central multicast protocol module to initiate the transmission of the upgrade package file and initiating the upgrade instruction. The central multicast protocol module is responsible for processing the upgrade package transmission instruction and completing the transmission of the upgrade package file. The remote multicast protocol module is responsible for receiving the upgrade package file, and the remote signaling module is responsible for processing the upgrade instruction from the central station.
The central station remotely upgrades the processing flow of a plurality of remote stations:
1. the user selects a plurality of remote station devices at the central station and executes the upgrade instruction.
2. The center signaling module informs the center multicast protocol module of the equipment to be upgraded and waits for the result.
3. And after the central multicast protocol module receives the equipment list to be upgraded, the central multicast protocol module starts to transmit the upgrade package to the remote station. And after the transmission is completed, returning a result to the central signaling module.
4. The central signaling module sends an upgrade instruction to the remote station.
5. And the remote signaling module receives the upgrade instruction to start upgrade and finishes upgrade processing.
Specifically, in the above step 3 of the present embodiment, the transmission of the upgrade package to the remote station may refer to the multicast file protocol transmission flow as illustrated in fig. 8 for a specific working manner.
Regarding multicast file transfer protocol:
the transmission protocol is divided into a client program and a server program, the client program is operated at each remote station device, and the server program is operated at the central station device.
Protocol messages are divided into control signaling and data messages.
The control signaling includes on-type signaling, end-type signaling, and error correction signaling.
And the open signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a fragment size, a multicast IP, a data transmission port number and a device group. The fragments default size is 512Bytes.
Ending signaling comprising file name, file length, md5 value, multicast IP, data transmission port number
And the error correction signaling comprises an error correction signaling type, a device group list and fragments to be corrected. Error correction signaling types include start error correction, end error correction, and error correction data.
The fragmentation data message used for sending carries the fragmentation sequence number, the effective data length and the transmission content
The transport protocol defaults to using multicast IP 224.0.0.1, 8888 port numbers as transport management signaling. The client establishes a UDP connection using the 8888 port number and joins the multicast group 224.0.0.1.
The method supports error correction frequency setting and multicast IP and port number setting used for data message transmission.
Multicast protocol message format:
Figure SMS_1
Figure SMS_2
Figure SMS_3
Figure SMS_4
Figure SMS_5
Figure SMS_6
based on this, referring to fig. 8, the transmission flow of this example is:
first, the central signaling module obtains a list of remote station devices that need to be upgraded.
The method comprises the steps of selecting a plurality of remote station devices to be upgraded at a central station according to a user, responding to an upgrade execution instruction initiated by the user, generating a remote station device list to be upgraded, and sending a file transmission instruction to a central multicast protocol module.
And then, the central multicast protocol module acquires a file name, a file size, a file md5 value and the like according to the file transmission instruction and the remote station equipment list acquired by the central signaling module, acquires an upgrade package file and calculates the total fragments.
And then, the central signaling module encapsulates the open signaling according to the upgrade package file acquired by the central multicast protocol module.
The central multicast protocol module then sends an on-type signaling to each remote station.
And then, the remote multicast protocol module receives the open signaling, judges whether the remote station where the remote multicast protocol module is located exists in a remote station equipment list, and establishes multicast UDP connection with the central multicast protocol module based on multicast IP and data transmission port number if the remote station exists. Generally, the multicast protocol module can be established after waiting 2s after sending the open signaling.
And then, the central multicast protocol module fragments the upgrade package file according to the default fragment size, and sends fragment data messages to the remote multicast protocol module which establishes multicast UDP connection.
And then, the remote multicast protocol module receives the fragmented data message and ignores the fragmented data message which is repeatedly received.
And then, the central multicast protocol module transmits error correction signaling after finishing the transmission of all the fragmented data messages.
And performing multiple error correction processing according to the preset error correction times. And most of link requirements can be met generally for 2-3 times. The error correction process is as follows:
1) And after the central multicast protocol module transmits all fragments, transmitting a start-type error correction signaling.
2) The remote multicast protocol module receives the error correction signaling and feeds back the received but not received fragment data message to the central multicast protocol module according to the information of the fragment data message to be retransmitted.
3) The remote multicast protocol module receives the retransmitted fragmented data message.
4) After waiting for 5s, the central multicast protocol module retransmits the collected fragmented data message needing retransmission
5) The remote multicast protocol module receives the retransmitted fragmented data message.
Then, the central multicast protocol module sends an end instruction.
Then, the remote multicast protocol module receives the ending instruction, closes the multicast UDP connection, ends the transmission, and feeds back the file receiving result to the remote signaling module.
The central signaling module then issues an upgrade instruction to the remote station.
Then, the remote signaling module receives the upgrade instruction to start upgrade and finishes the upgrade process.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and it is obvious that those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (8)

1. The multicast file sending method for batch upgrading of satellite equipment is characterized by being applied to a central station and comprising the following steps:
Obtaining an upgrade package file according to a remote station equipment list to be upgraded, calculating the total number of message fragments of the upgrade package file according to the default fragment size, and packaging an open type signaling, an end type signaling and an error correction signaling;
transmitting an open type signaling to each remote station, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number;
after a predetermined time interval, establishing a multicast UDP connection based on a multicast IP and a data transmission port number with a remote station present in a list of remote station devices;
the upgrade package file is fragmented according to the default fragmentation size, and then a fragmentation data message is sent to a remote station which establishes multicast UDP connection;
after all the fragmented data messages are transmitted, error correction processing is executed according to preset error correction times, and each error correction processing comprises the following steps:
transmitting error correction signaling with the type of error correction signaling as error correction signaling for starting error correction;
collecting the information of the fragment data message needing to be retransmitted from a remote station which establishes multicast UDP connection, wherein the retransmitted fragment data message is the fragment data message needing to be received but not received and fed back by the remote station through error correction signaling with error correction signaling type being error correction data;
after a preset time interval, retransmitting the fragmented data message needing retransmission to finish one-time error correction;
After the preset error correction times are all completed, transmitting error correction signaling with the error correction signaling type of ending error correction, and ending error correction;
sending ending signaling to enable the remote station to close the multicast UDP connection and end the transmission;
and sending an upgrade instruction to enable the remote station to complete upgrade according to a received upgrade package file, wherein the received upgrade package file refers to a set of fragmented data messages received by the remote station.
2. The multicast file transmission method for batch upgrade of satellite devices according to claim 1, wherein:
the open-type signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a default fragment size, a multicast IP, a data transmission port number and a remote station equipment list;
the ending signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and fragments to be corrected, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data;
after the upgrade package file is fragmented according to the default fragmentation size, the fragmented data message carries the fragmentation sequence number, the effective data length and the transmission content.
3. The multicast file transmitting device for batch upgrading of satellite equipment is characterized by comprising a signaling module and a multicast protocol module which are arranged in a central station, wherein the central station and a plurality of remote stations are in a star satellite frequency division system network;
The signaling module is used for acquiring a remote station equipment list to be upgraded;
the multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the signaling module;
the signaling module is used for calculating the total number of message fragments of the upgrade package file according to the default fragment size according to the upgrade package file acquired by the multicast protocol module, and encapsulating open signaling, end signaling and error correction signaling, wherein the open signaling comprises a remote station equipment list, multicast IP and a data transmission port number;
the multicast protocol module is used for sending the open-type signaling packaged by the signaling module to each remote station; and for establishing a multicast UDP connection with a remote station present in the list of remote station devices based on the multicast IP and the data transmission port number after a predetermined time interval; the method comprises the steps of establishing a multicast UDP connection, wherein the multicast UDP connection is used for establishing a multicast UDP connection, and sending a remote station to the remote station according to the multicast UDP connection after the upgrade packet file is fragmented according to the default fragment size; and is used for executing error correction processing according to the preset error correction times after finishing the transmission of all the fragmented data messages, and each error correction processing comprises: transmitting error correction signaling with the type of error correction signaling as error correction signaling for starting error correction; collecting the information of the fragment data message needing to be retransmitted from a remote station which establishes multicast UDP connection, wherein the retransmitted fragment data message is the fragment data message needing to be received but not received and fed back by the remote station through error correction signaling with error correction signaling type being error correction data; after a preset time interval, retransmitting the fragmented data message needing retransmission to finish one-time error correction; and is used for sending error correction signaling with error correction signaling type of ending error correction after the preset error correction times are all completed, and ending error correction; and after finishing error correction, sending finishing signaling to make the remote station close the multicast UDP connection, finishing the transmission and receiving the receiving result fed back by the remote station;
And the signaling module is used for sending an upgrade instruction after the multicast protocol module finishes the transmission, so that the remote station finishes upgrading according to a received upgrade package file, wherein the received upgrade package file is a set of fragmented data messages received by the remote station.
4. A multicast file transmitting apparatus for batch upgrading a satellite device according to claim 3, wherein:
the open-type signaling comprises a file name, a file length, an md5 value, a total number of message fragments, a default fragment size, a multicast IP, a data transmission port number and a remote station equipment list;
the ending signaling comprises a file name, a file length, an md5 value, a multicast IP and a data transmission port number;
the error correction signaling comprises an error correction signaling type, a remote station equipment list and fragments to be corrected, wherein the error correction signaling type comprises starting error correction, ending error correction and error correction data;
after the multicast protocol module fragments the upgrade package file according to the default fragment size, the fragmented data message carries the fragment sequence number, the effective data length and the transmission content.
5. The multicast file receiving method for batch upgrading of satellite equipment is characterized by being applied to a remote station and comprising the following steps:
Receiving an open-type signaling sent by a central station, wherein the open-type signaling comprises a remote station equipment list, a multicast IP and a data transmission port number, and the open-type signaling is obtained by encapsulating an upgrade package file obtained by the central station according to the remote station equipment list which needs to be upgraded;
judging whether the user exists in a remote station equipment list, if so, establishing multicast UDP connection with a central station based on multicast IP and a data transmission port number;
the method comprises the steps that a multicast UDP connection is used for receiving a fragmentation data message sent by a central station, wherein the sent fragmentation data message is obtained by the central station in a fragmentation way according to a default fragmentation size;
according to the preset error correction times, executing error correction processing, wherein each error correction processing comprises the following steps: the method comprises the steps of receiving an error correction signaling with the type of error correction signaling for starting error correction sent by a central station, and feeding back the information of the fragmented data message needing to be retransmitted to the central station, wherein the information of the fragmented data message needing to be retransmitted is the fragmented data message needing to be received but not received; after a preset time interval, receiving the retransmitted fragmented data message sent by the central station, and completing one-time error correction;
after the preset error correction times are all completed, receiving error correction signaling with the type of error correction signaling which is transmitted by the central station and is used for finishing error correction, and finishing error correction; the error correction signaling is obtained by encapsulating an upgrade package file obtained by a central station according to a remote station equipment list which is required to be upgraded;
Receiving an ending signaling sent by the central station, closing the multicast UDP connection, and ending the transmission; the ending signaling is obtained by encapsulating an upgrade package file obtained by a remote station equipment list which is upgraded by the central station according to the need;
after the transmission is completed, when an upgrade instruction sent by the central station is received, the upgrade is completed according to a received upgrade package file, wherein the received upgrade package file refers to a received set of fragmented data messages.
6. The multicast file receiving device for batch upgrading of the satellite equipment is characterized by comprising a multicast protocol module and a signaling module which are arranged at each remote station, wherein the signaling module is connected with the multicast protocol module, and each remote station and the central station are simultaneously in a star satellite frequency division system network;
the multicast protocol module is used for receiving an open type signaling sent by the central station, wherein the open type signaling comprises a remote station equipment list, multicast IP and a data transmission port number, and the open type signaling is obtained by encapsulating an upgrade package file obtained by the central station according to the remote station equipment list which is required to be upgraded;
and is used for judging whether oneself exists in the far-end station apparatus tabulation, if exist, based on multicasting IP and data transmission port number, set up multicasting UDP connection with the central station;
The method comprises the steps that a central station receives a fragmentation data message sent by the central station through multicast UDP connection, and the sent fragmentation data message is obtained by fragmenting an upgrade packet file according to a default fragmentation size by the central station;
and is configured to perform error correction processing according to a preset number of error correction times, where each error correction processing includes: the method comprises the steps of receiving an error correction signaling with the type of error correction signaling for starting error correction sent by a central station, and feeding back the information of the fragmented data message needing to be retransmitted to the central station, wherein the information of the fragmented data message needing to be retransmitted is the fragmented data message needing to be received but not received; after a preset time interval, receiving the retransmitted fragmented data message sent by the central station, and completing one-time error correction;
after the preset error correction times are all completed, receiving error correction signaling with the type of error correction signaling which is the error correction ending signaling and sent by the central station, and ending error correction; the error correction signaling is obtained by encapsulating an upgrade package file obtained by a central station according to a remote station equipment list which is required to be upgraded;
and is used for receiving the ending signaling sent by the central station, so that the remote station closes the multicast UDP connection and ends the transmission; the ending signaling is obtained by encapsulating an upgrade package file obtained by a remote station equipment list which is upgraded by the central station according to the need;
The signaling module is used for obtaining a receiving result fed back by the multicast protocol module, responding to an upgrading instruction sent by the central station after the multicast protocol module finishes receiving and transmitting the upgrading file packet, and executing upgrading of the remote station equipment according to the upgrading file packet.
7. The multicast file transmission method for batch upgrade satellite equipment is characterized by being applied to a central station and a plurality of remote stations which are in a satellite frequency division system network, and comprises the following steps:
the central station acquires an upgrade package file according to a remote station equipment list which is required to be upgraded, calculates the total number of message fragments of the upgrade package file according to the default fragment size, and encapsulates an opening type signaling, an ending type signaling and an error correction signaling;
the central station sends an open-type signaling to each remote station, wherein the open-type signaling comprises a remote station equipment list, multicast IP and a data transmission port number;
the remote station judges whether the remote station exists in a remote station equipment list according to the received open-type signaling, if so, the remote station establishes multicast UDP connection with the central station based on multicast IP and a data transmission port number;
the central station fragments the upgrade package file according to the default fragment size, and sends a fragment data message to a remote station which establishes multicast UDP connection;
The remote station receives the fragmented data message and ignores the repeatedly received fragmented data message;
after the central station completes the transmission of all the fragmented data messages, error correction processing is executed according to preset error correction times, and each error correction processing comprises: the central station sends error correction signaling with the type of error correction signaling as error correction starting signaling; the remote station receives the error correction signaling for starting error correction, and feeds back the received but not received fragmented data message to the central station according to the information of the fragmented data message to be retransmitted; after a preset time interval, the central station retransmits the fragment data message needing to be retransmitted, and the remote station receives the retransmitted fragment data message to finish primary error correction;
after the preset error correction times are all completed, the central station sends error correction signaling with the type of error correction signaling being error correction ending, and the remote station receives the error correction signaling ending the error correction and ends the error correction; the central station sends an ending signaling, and the remote station closes the multicast UDP connection according to the received ending signaling to end the transmission;
the central station sends an upgrade instruction, the remote station receives the upgrade instruction and finishes upgrade according to a received upgrade package file, wherein the received upgrade package file refers to a set of fragmented data messages received by the remote station.
8. The multicast file transmission device for batch upgrade of satellite equipment is characterized by comprising the following components: the central station and the remote stations are in a star satellite frequency division system network;
the central signaling module is used for acquiring a remote station equipment list to be upgraded;
the central multicast protocol module is used for acquiring an upgrade package file according to the remote station equipment list acquired by the central signaling module;
the central signaling module is used for calculating the total number of message fragments of the upgrade package file according to the default fragment size according to the upgrade package file acquired by the central multicast protocol module, and encapsulating open signaling, end signaling and error correction signaling, wherein the open signaling comprises a remote station equipment list, multicast IP and a data transmission port number;
the central multicast protocol module is used for sending the open-type signaling to each remote station; the remote multicast protocol module is used for receiving the open-type signaling, judging whether the remote station where the remote multicast protocol module is located exists in a remote station equipment list, and if so, establishing multicast UDP connection with the central multicast protocol module based on multicast IP and data transmission port numbers;
The central multicast protocol module is used for fragmenting the upgrade package file according to the default fragment size and sending fragment data messages to the remote multicast protocol module which establishes multicast UDP connection; the remote multicast protocol module is used for receiving the fragmented data message and ignoring the repeatedly received fragmented data message;
the central multicast protocol module and the remote multicast protocol module are used for executing error correction processing according to preset error correction times after all the fragmented data messages are transmitted, and each time of error correction processing is as follows: the central multicast protocol module sends error correction signaling with the type of error correction signaling as error correction starting signaling; the remote multicast protocol module receives the error correction signaling and feeds back the received but not received fragment data message to the central multicast protocol module by the fragment data message information needing retransmission; after a preset time interval, the central multicast protocol module resends the fragment data message needing to be retransmitted; the remote multicast protocol module receives the retransmitted fragment data message and completes one-time error correction;
the central multicast protocol module is used for sending error correction signaling with the type of error correction signaling ending error correction after the preset error correction times are all completed; the remote multicast protocol module is used for receiving error correction signaling for ending error correction and ending error correction;
The central multicast protocol module is used for sending the ending signaling; the remote multicast protocol module is used for receiving the ending signaling, closing the multicast UDP connection and ending the transmission;
the central signaling module is used for sending an upgrading instruction to the remote station; and the remote signaling module is used for receiving the upgrade instruction to start upgrade and finishing upgrade processing.
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