CN109257418B - Segmented reliable transmission method based on mobile reliable transmission agent - Google Patents
Segmented reliable transmission method based on mobile reliable transmission agent Download PDFInfo
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- 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
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- 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
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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- 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
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/06—Transport layer protocols, e.g. TCP [Transport Control Protocol] over wireless
Abstract
The invention belongs to the technical field of aerospace information network communication protocols, and discloses a segmented reliable transmission method based on a mobile reliable transmission agent, which mainly comprises the following steps: 1) an end-to-end segmented data communication connection is established between the communication source end and the communication destination end; 2) the mobile reliable transmission agent exchanges end-to-end communication connection information; 3) beginning end-to-end segmented data transmission; 4) discovering mobile reliable transmission agent switching, and suspending an end-to-end segmented data transmission process; 5) switching mobile reliable transmission agents and carrying out end-to-end connection synchronization; 6) ending the mobile reliable transmission agent switching and recovering the end-to-end segmented data transmission process. Compared with the prior art, the invention designs an information interaction mechanism among the mobile reliable transmission agents, ensures the continuity of end-to-end connection in the switching process of the mobile reliable transmission agents and effectively utilizes link bandwidth resources.
Description
Technical Field
The invention belongs to the technical field of aerospace information network communication protocols, and particularly relates to a segmented reliable transmission method based on a mobile reliable transmission agent.
Background
The air-space information network is a comprehensive network integrating various air-based and space-based systems, and network nodes in the network comprise various aircrafts, near space platforms and various satellites with different orbit heights and types, so that information transmission services are provided for various air and ground users. Compared with a ground cellular network, the air-space information network has wide communication coverage range, can support the access of a user terminal without depending on complex ground infrastructure, and is not economical or practical in communication scenes such as forests, deep mountains, deserts or seas with wide communication range and rare people, so that the terminal directly accesses to a satellite or a near space platform is the most ideal choice in the scenes, and the advantages of the air-space information network can be fully exerted.
The Transmission Control Protocol (TCP) widely used on the ground has a seriously decreased transmission performance due to the characteristics of high error code, long time delay, asymmetry of uplink and downlink of a spatial wireless link, and the like. At present, there are three main schemes for improving the transmission efficiency of a spatial link, the first scheme is to adjust TCP protocol parameters to adapt to the spatial link environment, and the adjustable parameters include a TCP sending window, a congestion control algorithm and the like; the second scheme is to adopt a new reliable transmission protocol more adaptive to the characteristics of the spatial link, such as the SCPS-TP protocol proposed by CCSDS; the third scheme is that the reliable transmission proxy gateway based on the segmentation technology segments the end-to-end connection, so that each segment of connection can use a reliable transmission protocol suitable for the link characteristics of the segment of connection, and the bandwidth utilization rate of the end-to-end link is further improved. The third scheme is the most common method adopted in commercial application at present, a reliable transmission agent is respectively arranged at access points on two sides of a satellite link, so that an end-to-end TCP connection is divided into 3 sections, a standard TCP' protocol is still adopted for ground links on two sides of the reliable transmission agent, and other reliable transmission protocols suitable for space links are adopted between the two reliable transmission agents. In addition, in order to improve the end-to-end transmission efficiency, the reliable transmission agent is deployed on various aircrafts in a low earth orbit satellite or an adjacent space, and the switching of the mobile reliable transmission agent is caused by the relative movement between the mobile reliable transmission agent and a mobile communication terminal, so that the original segmented communication connection based on the reliable transmission agent is damaged, the end-to-end reliable data transmission process is interrupted, the reliability and the continuity of the end-to-end data transmission cannot be ensured, the effective utilization rate of a link bandwidth is low, and the quality of user application service is reduced.
In summary, the problems of the prior art are as follows: due to the switching of the mobile reliable transmission agent caused by the movement of the mobile reliable transmission agent, the original segmented communication connection based on the mobile reliable transmission agent is damaged, the end-to-end reliable data transmission process is interrupted, the reliability and the continuity of the end-to-end data transmission cannot be ensured, the effective utilization rate of a link bandwidth is low, and the quality of service of user application is reduced.
Disclosure of Invention
The invention aims to provide a segmentation reliable transmission method based on a mobile reliable transmission agent, and aims to solve the problems that the original segmentation communication connection based on the mobile reliable transmission agent is damaged due to the switching of the mobile reliable transmission agent caused by the movement of the mobile reliable transmission agent, so that the reliability and the continuity of end-to-end data transmission are difficult to ensure, the effective utilization rate of link bandwidth is low, and the quality of user application service is reduced.
The technical idea for realizing the above purpose is that the segmented reliable transmission method based on the mobile reliable transmission agent comprises the following steps:
(1) an end-to-end segmented data communication connection is established between the communication source end and the communication destination end; the communication source end divides the data communication connection between the communication source end and the communication destination end into three sections through the source end side mobile reliable transmission agent, any communication subnet and the destination end side mobile reliable transmission agent, wherein the three sections are the data communication connection between the communication source end and the source end side mobile reliable transmission agent, the data communication connection between the source end side mobile reliable transmission agent and the destination end side mobile reliable transmission agent and the data communication connection between the destination end side mobile reliable transmission agent and the communication destination end.
(2) The information of the interactive end-to-end communication connection between the mobile reliable transmission agents comprises the following steps:
(2a) distributing data communication connection information, and when a new end-to-end data communication connection is established, placing the end-to-end data communication connection into an online connection list by a source end side mobile reliable transmission agent and a target end side mobile reliable transmission agent contained in the end-to-end data communication connection, and identifying that the data communication connection is in a 'synchronous' state; and sending the end-to-end data communication connection information to mobile reliable transmission agents adjacent to the geographical position of the mobile reliable transmission agents;
(2b) updating connection information, when the mobile reliable transmission agent receives the end-to-end data communication connection information, putting the end-to-end data communication connection information into a prepared connection list, setting a timeout timer for the end-to-end data communication connection, and if the timer is overtime, deleting the end-to-end data communication connection from the prepared connection list.
(3) Beginning end-to-end segmented data transmission; before the switching of the mobile reliable transmission agent does not occur, the communication source end carries out the segmental reliable data transmission with the communication destination end through the source end side mobile reliable transmission agent and the destination end side mobile reliable transmission agent in sequence.
(4) Discovering mobile reliable transport agent handover; when the mobile reliable transmission agent receives the end-to-end communication data message, the attribution judgment is carried out; if the data message belongs to a certain end-to-end data communication connection in the online connection list and the end-to-end data communication connection is in a 'synchronous' state, the message is reliably transmitted in a segmented mode; if the data message belongs to a certain end-to-end data communication connection in an online connection list and the end-to-end data communication connection is in an 'unsynchronized' state, adding the data message into a data buffer queue of the end-to-end data communication connection; if the data message belongs to a certain end-to-end data communication connection in the prepared connection list, moving the end-to-end data communication connection into an online connection list, marking the data message as an 'unsynchronized' state, adding the data message into a data buffer area queue of the end-to-end data communication connection, marking the mobile reliable transmission agent as a take-over agent, and turning to the step (5); otherwise, the data message is discarded.
(5) Switching a mobile reliable transport agent and performing end-to-end connection synchronization, specifically comprising:
(5a) synchronizing the end-to-end data communication connection of the mobile reliable transmission agent in an 'unsynchronized' state, and sending an end-to-end synchronization request message to the mobile reliable transmission agent at the source end side and the mobile reliable transmission agent at the target end side;
(5b) when the mobile reliable transmission agent receives the end-to-end synchronization request message, the attribution judgment is carried out; if the end-to-end synchronous request message belongs to a certain end-to-end data connection in an online connection list, the end-to-end data connection state is modified into an 'unsynchronized' state, synchronous information corresponding to the end-to-end data communication connection is packaged in an end-to-end synchronous response message, the end-to-end synchronous response message interacts with a mobile reliable transmission agent initiating the end-to-end synchronous request message, and an end-to-end synchronous process is started; when the end-to-end synchronization process is finished, sending an end-to-end synchronization end message, and updating an online connection list;
(5c) when the mobile reliable transmission agent receives end-to-end synchronization end messages sent by a source end side mobile reliable transmission agent and a destination end side mobile reliable transmission agent corresponding to the end-to-end data communication connection marked in the 'unsynchronized' state, the end-to-end data communication connection marked in the 'unsynchronized' state is marked in the 'synchronized' state, and the step (6) is carried out.
(6) And (5) ending the mobile reliable transmission agent switching, recovering the end-to-end segmented data transmission process, and returning to the step (2).
Further, the end-to-end data communication connection information in step (1) of the segmented reliable transmission method based on the mobile reliable transmission agent should include communication address information of nodes such as a communication source end, a source end side mobile reliable transmission agent, a destination end side mobile reliable transmission agent, a communication destination end and the like; the "synchronous" state indicates that the end-to-end data communication can currently be segmented reliably data-transmitted according to the segmented communication connection.
Further, the 'unsynchronized' state in step (4) of the segmented reliable transmission method based on the mobile reliable transmission agent indicates that the data transmission processes of the segmented communication connections of the end-to-end data communication connection are not matched and the segmented reliable transmission process needs to be suspended.
Further, in the step (5b), in the process of end-to-end data synchronization, the mobile reliable transmission agent establishes a reliable data transmission connection to the mobile reliable transmission agent initiating the end-to-end data synchronization request, and any data transmission protocol capable of ensuring data reliability can be adopted.
Compared with the prior art, the invention has the advantages that:
the invention provides a segmented reliable transmission method based on a mobile reliable transmission agent, aiming at the problem that the original segmented connection based on the mobile reliable transmission agent is damaged finally due to the switching of the mobile reliable transmission agent in the moving process of the mobile reliable transmission agent.
Drawings
Fig. 1 is a flowchart of a segmented reliable transmission method based on a mobile reliable transmission agent according to an embodiment of the present invention.
Fig. 2 is an application scenario diagram of a segmented reliable transmission method based on a mobile reliable transmission agent according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of links before and after handover of a mobile reliable transport agent in a segmented reliable transport method based on the mobile reliable transport agent according to an embodiment of the present invention.
Fig. 4 is a diagram illustrating a process of establishing a connection and transmitting data in the segmented reliable transmission method based on a mobile reliable transmission agent according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the embodiments, wherein the TCP protocol is used as an end-to-end data reliable transport protocol. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1, the segmented reliable transmission method based on a mobile reliable transmission agent according to an embodiment of the present invention includes the following steps:
s101, establishing an end-to-end segmented data communication connection between a communication source end and a communication destination end;
s102, the mobile reliable transmission agent exchanges end-to-end communication connection information;
s103, starting end-to-end segmented data transmission;
s104, discovering mobile reliable transmission agent switching, suspending the end-to-end segmented data transmission process;
s105, switching the mobile reliable transmission agent and carrying out end-to-end connection synchronization;
s106, ending the mobile reliable transmission agent switching and recovering the end-to-end segmented data transmission process.
The segmentation reliable transmission method based on the mobile reliable transmission agent provided by the embodiment of the invention specifically comprises the following steps:
1) an end-to-end segmented transmission connection is established between a communication source end and a communication destination end, supposing that the communication source end initiates a TCP connection to the communication destination end, virtual response is carried out successively by a source end side mobile reliable transmission agent and a destination end side mobile reliable transmission agent, the TCP connection between the communication source end and the communication destination end is divided into three segments which are respectively the TCP connection between the communication source end and the source end side mobile reliable transmission agent, the TCP connection between the source end side mobile reliable transmission agent and the destination end side mobile reliable transmission agent, and the TCP connection between the destination end side mobile reliable transmission agent and the communication destination end, wherein the segmented TCP connection establishment process is as follows:
(1a) a communication source end initiates a TCP connection request SYN to a communication destination end;
(1b) the source side mobile reliable transmission agent intercepts a connection establishment request SYN sent by a communication source end to a communication destination end, replaces the communication source end to send the connection establishment request SYN to the communication destination end, simultaneously puts quadruple information corresponding to the end-to-end data communication connection into a prepared connection list, sets an overtime timer for the end-to-end data communication connection, and deletes the end-to-end data communication connection from the prepared connection list if the timer triggers overtime;
(1c) the destination end side mobile reliable transmission agent intercepts a connection establishment request SYN sent by a source end side mobile reliable transmission agent to a communication destination end, continues to replace the communication source end to send the connection establishment request SYN to the communication destination end, simultaneously puts a quadruple corresponding to the end-to-end data communication connection information into a prepared connection list, sets an overtime timer for the end-to-end data communication connection, and deletes the end-to-end data communication connection from the prepared connection list if the timer is overtime;
(1d) the communication destination end receives a connection establishment request SYN sent to the communication destination end and sends a connection establishment request response SYN-ACK to the communication source end;
(1e) the destination end side mobile reliable transmission agent intercepts and captures a connection establishment request response SYN-ACK sent to the communication source end by the communication destination end, replaces the communication destination end to reply the connection establishment request response SYN-ACK to the communication source end, simultaneously inquires the end-to-end data communication connection information in a connection information base, and puts the end-to-end data communication connection into an online connection list if the data message belongs to a certain end-to-end data communication connection in a prepared connection list and marks the connection establishment request response SYN-ACK in an 'unsynchronized' state; otherwise, discarding the message;
(1f) a source end side mobile reliable transmission agent intercepts and captures a connection establishment request response SYN-ACK sent to a communication source end by a destination end side mobile reliable transmission agent, and continuously replaces the communication destination end to reply the connection establishment request response SYN-ACK to the communication source end, meanwhile, the end-to-end data communication connection information is inquired in a connection information base, if the data message belongs to a certain end-to-end data communication connection in a prepared connection list, the end-to-end data communication connection is put into an online connection list and is marked to be in an 'unsynchronized' state; otherwise, discarding the message;
(1g) the communication source end receives a SYN-ACK response of a connection establishing request sent by a source end side mobile reliable transmission agent instead of a communication destination end, and simultaneously sends an ACK response of the connection establishing request to the communication destination end;
(1h) a source side mobile reliable transmission agent intercepts a connection establishment request response ACK sent by a communication source end to a communication destination end, initiates the connection establishment request response ACK to the communication destination end instead of the communication source end, simultaneously inquires the end-to-end data communication connection information in a connection information base, if the end-to-end data synchronization request message belongs to a certain end-to-end data connection in an online connection list, and the end-to-end data connection state is modified to be an 'unsynchronized' state, identifies the end-to-end data communication connection identified to be the 'unsynchronized' state to be a 'synchronous' state, and sends the data communication connection information to a neighbor mobile reliable transmission agent; otherwise, discarding the message;
(1i) the destination end side mobile reliable transmission agent intercepts and captures a connection establishment request response ACK sent to a communication destination end by a communication source end side mobile reliable transmission agent, and continuously replaces a communication source end to send the connection establishment request response ACK to the communication destination end, meanwhile, the end-to-end data communication connection information is inquired in a connection information base, if the end-to-end data synchronization request message belongs to a certain end-to-end data connection in an online connection list, and the end-to-end data connection state is modified into an 'unsynchronized' state, the end-to-end data communication connection marked in the 'unsynchronized' state is marked in a 'synchronous' state, and the data communication connection information is sent to a neighbor mobile reliable transmission agent; otherwise, discarding the message;
(1j) and the communication destination end receives the connection establishment request response ACK from the communication source end, and the segmented connection establishment process is ended.
(2) When the mobile reliable transmission agent receives the end-to-end data communication connection information, the end-to-end data communication connection information is put into a prepared connection list, a timeout timer is set for the end-to-end data communication connection, and if the timer is overtime, the end-to-end data communication connection is deleted from the prepared connection list.
(3) And when the mobile reliable transmission agent receives the end-to-end data communication data message, performing attribution judgment. If the data message belongs to a certain end-to-end data communication connection in the online connection list and the end-to-end data communication connection is in a 'synchronous' state, the message is reliably transmitted in a segmented mode; if the data message belongs to a certain end-to-end data communication connection in an online connection list and the end-to-end data communication connection is in an 'unsynchronized' state, adding the data message into a data buffer queue of the end-to-end data communication connection; if the data message belongs to a certain end-to-end data communication connection in the prepared connection list, putting the end-to-end data communication connection into an online connection list, marking the data message in an 'unsynchronized' state, adding the data message into a data buffer queue of the end-to-end data communication connection, and turning to the step (4); otherwise, the data packet is discarded.
(4) Discovering mobile reliable transmission agent switching, and suspending an end-to-end segmented data transmission process; when the mobile reliable transmission agent receives the end-to-end communication data message, the attribution judgment is carried out; if the data message belongs to a certain end-to-end data communication connection in the online connection list and the end-to-end data communication connection is in a 'synchronous' state, the message is reliably transmitted in a segmented mode; if the data message belongs to a certain end-to-end data communication connection in an online connection list and the end-to-end data communication connection is in an 'unsynchronized' state, adding the data message into a data buffer queue of the end-to-end data communication connection; if the data message belongs to a certain end-to-end data communication connection in the prepared connection list, moving the end-to-end data communication connection into an online connection list, marking the data message as an 'unsynchronized' state, adding the data message into a data buffer area queue of the end-to-end data communication connection, marking the mobile reliable transmission agent as a take-over agent, and turning to the step (5); otherwise, discarding the data message;
(5) switching mobile reliable transmission agents and carrying out end-to-end connection synchronization; the method specifically comprises the following steps:
(5a) synchronizing the end-to-end data communication connection of the mobile reliable transmission agent in an 'unsynchronized' state, and sending an end-to-end synchronization request message to the mobile reliable transmission agent at the source end side and the mobile reliable transmission agent at the target end side;
(5b) when the mobile reliable transmission agent receives the end-to-end synchronization request message, the attribution judgment is carried out; if the end-to-end synchronous request message belongs to a certain end-to-end data connection in an online connection list, the end-to-end data connection state is modified into an 'unsynchronized' state, synchronous information corresponding to the end-to-end data communication connection is packaged in an end-to-end synchronous response message, the end-to-end synchronous response message interacts with a mobile reliable transmission agent initiating the end-to-end synchronous request message, and an end-to-end synchronous process is started; when the end-to-end synchronization process is finished, sending an end-to-end synchronization end message, and updating an online connection list;
(5c) when the mobile reliable transmission agent receives end-to-end synchronization end messages sent by a source end side mobile reliable transmission agent and a destination end side mobile reliable transmission agent corresponding to the end-to-end data communication connection marked in the 'unsynchronized' state, the end-to-end data communication connection marked in the 'unsynchronized' state is marked in the 'synchronized' state, and the step (6) is carried out.
(6) Ending the mobile reliable transmission agent switching and recovering the end-to-end segmented data transmission process. And (4) returning to the step (2).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A segmented reliable transmission method based on a mobile reliable transmission agent is characterized by comprising the following steps:
(1) an end-to-end segmented data communication connection is established between the communication source end and the communication destination end;
(2) the mobile reliable transmission agent exchanges end-to-end communication connection information;
(3) beginning end-to-end segmented data transmission; before the switching of the mobile reliable transmission agent does not occur, the communication source end carries out segmented reliable data transmission with the communication destination end through the source end side mobile reliable transmission agent and the destination end side mobile reliable transmission agent in sequence;
(4) discovering mobile reliable transport agent handover;
(5) switching mobile reliable transmission agents and carrying out end-to-end connection synchronization;
(6) ending the mobile reliable transmission agent switching, recovering the end-to-end segmented data transmission process, and returning to the step (2);
the step (4) comprises the following steps:
when the mobile reliable transmission agent receives the end-to-end communication data message, the attribution judgment is carried out; if the data message belongs to a certain end-to-end data communication connection in the online connection list and the end-to-end data communication connection is in a 'synchronous' state, the message is reliably transmitted in a segmented mode; if the data message belongs to a certain end-to-end data communication connection in an online connection list and the end-to-end data communication connection is in an 'unsynchronized' state, adding the data message into a data buffer queue of the end-to-end data communication connection; if the data message belongs to a certain end-to-end data communication connection in the prepared connection list, moving the end-to-end data communication connection into an online connection list, marking the data message as an 'unsynchronized' state, adding the data message into a data buffer area queue of the end-to-end data communication connection, marking the mobile reliable transmission agent as a take-over agent, and turning to the step (5); otherwise, the data message is discarded.
2. The segmented reliable transmission method based on mobile reliable transmission agent as claimed in claim 1, wherein the communication source divides the data communication connection between the communication source and the communication destination into three segments via the source-side mobile reliable transmission agent, any communication subnet and the destination-side mobile reliable transmission agent, which are the data communication connection between the communication source and the source-side mobile reliable transmission agent, the data communication connection between the source-side mobile reliable transmission agent and the destination-side mobile reliable transmission agent and the data communication connection between the destination-side mobile reliable transmission agent and the communication destination, respectively.
3. The segmented reliable transmission method based on mobile reliable transmission agent as claimed in claim 1, wherein the end-to-end data communication connection information in step (4) includes communication address information of nodes such as communication source end, source end side mobile reliable transmission agent, destination end side mobile reliable transmission agent, and communication destination end; the "synchronous" state indicates that the end-to-end data communication can currently be segmented reliably data-transmitted according to the segmented communication connection.
4. The mobile reliable transport agent based segmented reliable transport method of claim 1 wherein said step (2) comprises:
(2a) distributing data communication connection information, and when a new end-to-end data communication connection is established, placing the end-to-end data communication connection into an online connection list by a source end side mobile reliable transmission agent and a target end side mobile reliable transmission agent contained in the end-to-end data communication connection, and identifying that the data communication connection is in a 'synchronous' state; and sending the end-to-end data communication connection information to mobile reliable transmission agents adjacent to the geographical position of the mobile reliable transmission agents;
(2b) updating connection information, when the mobile reliable transmission agent receives the end-to-end data communication connection information, putting the end-to-end data communication connection information into a prepared connection list, setting a timeout timer for the end-to-end data communication connection, and if the timer is overtime, deleting the end-to-end data communication connection from the prepared connection list.
5. The segmented reliable transmission method based on mobile reliable transmission agent as claimed in claim 1, wherein the "unsynchronized" status in step (4) indicates that the segmented reliable transmission process of the end-to-end data communication connection is not matched and needs to be suspended.
6. The mobile reliable transport agent based segmented reliable transport method according to claim 1, wherein said step (5) comprises:
(5a) synchronizing the end-to-end data communication connection of the mobile reliable transmission agent in an 'unsynchronized' state, and sending an end-to-end synchronization request message to the mobile reliable transmission agent at the source end side and the mobile reliable transmission agent at the target end side;
(5b) when the mobile reliable transmission agent receives the end-to-end synchronization request message, the attribution judgment is carried out; if the end-to-end synchronous request message belongs to a certain end-to-end data connection in an online connection list, the end-to-end data connection state is modified into an 'unsynchronized' state, synchronous information corresponding to the end-to-end data communication connection is packaged in an end-to-end synchronous response message, the end-to-end synchronous response message interacts with a mobile reliable transmission agent initiating the end-to-end synchronous request message, and an end-to-end synchronous process is started; when the end-to-end synchronization process is finished, sending an end-to-end synchronization end message, and updating an online connection list;
(5c) when the mobile reliable transmission agent receives end-to-end synchronization end messages sent by a source end side mobile reliable transmission agent and a destination end side mobile reliable transmission agent corresponding to the end-to-end data communication connection marked in the 'unsynchronized' state, the end-to-end data communication connection marked in the 'unsynchronized' state is marked in the 'synchronized' state, and the step (6) is carried out.
7. The mobile reliable transport agent-based segmented reliable transport method according to claim 6, wherein in the end-to-end synchronization procedure in step (5 b): the mobile reliable transmission agent establishes reliable data transmission connection to the mobile reliable transmission agent initiating the end-to-end synchronization request, and any data transmission protocol capable of ensuring data reliability can be adopted.
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