CN115580379B - Multilink network transmission method and system - Google Patents
Multilink network transmission method and system Download PDFInfo
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- CN115580379B CN115580379B CN202211304999.XA CN202211304999A CN115580379B CN 115580379 B CN115580379 B CN 115580379B CN 202211304999 A CN202211304999 A CN 202211304999A CN 115580379 B CN115580379 B CN 115580379B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0042—Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape
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- 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
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0829—Packet loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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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
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2212/00—Encapsulation of packets
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- 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
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Abstract
The invention discloses a multilink network transmission method and system, and relates to the field of network transmission. The method comprises the following steps: k data packets are selected from a plurality of data packets of target data to be transmitted, error correction is carried out by taking the data packets as units to obtain redundant packets, and k data packets and the redundant packets are combined to obtain a data packet group to be transmitted and are packaged into a frame; based on the number of links of a pre-established transmission link group, equally dividing the frame to obtain a plurality of data packet groups, wherein each data packet group is transmitted by any one link of the transmission link group, and transmission is started; the receiving node receives the data packet group transmitted by each link, and analyzes and synthesizes the target data. The invention adopts multiple links to realize data transmission, when one or more links have the conditions of large packet loss rate, long delay time, network failure and the like, the redundant data packets transmitted by other normal links are subjected to error correction coding to recover lost data in time, the integral transmission of the data is not influenced, and the reliability and fluency of network transmission are effectively improved.
Description
Technical Field
The present invention relates to the field of network transmission, and in particular, to a method and system for transmitting a multi-link network.
Background
When in network data communication, the problems of network congestion, data transmission delay, high packet loss rate, wire breakage and the like often occur in the data transmission process due to unstable network broadband. Especially, in the data transmission process based on the TCP protocol, when the abnormal condition of the data transmission process is met, the problem that the data transmission recovery time is long, and even the data transmission can be continued after disconnection and reconnection is required, and further the experience is poor when a user uses the existing network data communication to transmit data is further caused.
Therefore, it is required to find a data transmission method, which can ensure the smoothness and reliability of data transmission on the premise of influencing the data transmission by factors such as network fluctuation and faults.
Disclosure of Invention
The invention aims to provide a multilink network transmission method and a multilink network transmission system, which are used for solving the problems of unsmooth data transmission and poor data reliability caused by network fluctuation, network failure and other factors.
To achieve the above object, a first aspect of the present invention provides a method for transmitting a multi-link network, including:
s1, selecting k data packets from a plurality of data packets of target data to be transmitted, and correcting errors by taking the k data packets as units to obtain redundant packets, wherein the k data packets and the redundant packets are combined to obtain a data packet group to be transmitted;
s2, packaging the data packets in the data packet group to be transmitted into a frame;
s3, based on the number of links of a pre-established transmission link group, equally dividing the frame to obtain a plurality of data packet groups, and after each data packet group adds packet header information, transmitting the data packet by any one link of the transmission link group, and starting transmission;
s4, the receiving node receives the data packet group transmitted by each link, and analyzes and synthesizes target data;
at least before S1, further comprising: based on the transmission data requirement between the sending node and the receiving node, a link pool containing n links between the two nodes is established, m links are selected from the link pool, and a transmission link group between the two nodes is established, wherein n is greater than m.
Preferably, the establishing a link pool between two nodes, including n links, based on the transmission data requirement between the sending node and the receiving node, specifically includes: the sending node and the receiving node respectively establish connection with a management server; the management server acquires n cloud forwarding servers for realizing data forwarding; and establishing a link between the sending node and the receiving node based on each cloud forwarding server to form a link pool containing n links.
Preferably, the method further comprises the steps of: detecting whether the network state of each link in the transmission link group is abnormal or not in real time; the anomaly of the network state includes: the delay time of transmission exceeds the preset delay time, and the packet loss rate exceeds the preset packet loss rate and network faults; when the network state is abnormal, selecting a link from the rest links in the link pool to replace the link with abnormal current network state, and adding the link into the transmission link group.
Preferably, the frame is divided into a plurality of data packet groups based on the number of links of the transmission link group, and the number of data packets L in each data packet group is calculated by using formula (1):
L＝(k+l)/m (1)
and L is the total number of redundant packets in the data packet group to be transmitted, and the values of k and m ensure that L is smaller than or equal to the number of data packets which can be corrected by error correction coding.
Preferably, S4, the receiving node receives the packet group transmitted by each link, and parses and synthesizes the target data, specifically:
s401, judging whether the time of the received data packet group exceeds a preset delay time; if not, then S402 is entered; if so, go to S404;
s402, analyzing the data packet groups received from each link based on the receiving node to obtain packet header information, judging whether all the data packet groups are received completely, if so, discarding redundant packets, and directly sequencing and combining according to the data packet numbers carried in the packet header information to obtain target data; if not, then S403 is entered;
s403, judging whether the number of the data packets received by the receiving node reaches a preset packet number; if so, decoding is carried out based on error correction codes carried in the redundant packets, all data packet groups of the current frame are recovered, and the target data are obtained according to the sequence combination of the data packet numbers carried in the packet header information; if not, then S404 is entered,
s404, selecting a data packet group from the pre-established transmission link groups to send a normal working link, requesting the sending end to resend the missing data packet group, and returning to S401.
A second aspect of the present invention provides a multilink network transmission system, the system comprising:
a link pool establishment module: the method comprises the steps that a sending node and a receiving node are connected to a management server to obtain available information of a plurality of cloud forwarding servers, and the sending node and the receiving node respectively establish links with the cloud forwarding servers to form a link pool;
and a link selection module: selecting a plurality of links from a link pool to form a transmission link group between the two nodes, wherein the number of the links of the transmission link group is smaller than that of the links in the link pool;
and (3) link fault detection: detecting whether the network state of each link in the transmission link group is abnormal or not in real time; the anomaly of the network state includes: the delay time of transmission exceeds the preset delay time, and the packet loss rate exceeds the preset packet loss rate and network faults;
and a data transmitting module: selecting k data packets from a plurality of data packets of target data to be transmitted, performing error correction by taking the k data packets as units to obtain redundant packets, and uniformly dividing all packets in a frame to each link in a transmission link group based on the number of links in the transmission link group to be transmitted by the k data packets and the redundant packet frame;
a first judging module: judging whether the time of the data packet group received by the receiving node exceeds a preset delay time or not;
and a second judging module: judging whether the number of the data packets received by the receiving node reaches a preset packet number or not;
a data receiving module; analyzing packet header information of data packet groups received from each link, checking whether all data packets are completely received, discarding redundant packets if the data packets are completely received, and sequencing and combining according to data packet numbers carried in the packet header information to obtain target data; if the number of the received data packets meets the number required by error correction coding and error correction, directly recovering the missing data packet group through error correction decoding, and sequencing and combining according to the number of the data packets carried in the packet header information to obtain target data;
the request module sends a request for selecting a data packet group from the transmission link groups to send a normal working link to the link selection module when the situation occurs, and simultaneously sends a request for retransmitting the missing data packet group to the sending node; the situation is at least one of the following: the time of the data packet group received by the receiving node exceeds the preset delay time, and the number of the data packets received by the receiving node does not reach the preset packet number.
Preferably, the system further comprises: and a link updating module: when the network state is abnormal, selecting a link from the rest links in the link pool to replace the link with abnormal current network state, adding the link into the transmission link group, and closing the link with abnormal current network state.
According to the technical scheme, the transmission of the data is realized by adopting multiple links, when the packet loss rate of one or more links exceeds a preset threshold value, the delay time exceeds a preset threshold value or network faults and the like, error correction coding can be realized through redundant data packets transmitted by other normal links, lost data can be recovered in time, the integral transmission of the data is not influenced, and the reliability and fluency of network transmission are effectively improved.
According to the technical scheme, the data transmission is realized by adopting multiple links, the problems of data transmission blocking, interruption and the like caused by network transmission congestion and network failure in the current single link data transmission process are effectively solved, and the network transmission reliability is improved.
Drawings
FIG. 1 is a schematic diagram of link establishment in one embodiment of the invention;
FIG. 2 is a schematic diagram of a link failure update in one embodiment of the invention;
FIG. 3 is a schematic diagram of data transmission in one embodiment of the invention;
fig. 4 is a schematic diagram of data reception in one embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the invention.
The principle of the application is as follows: for target data to be transmitted, taking k data packets as the number of original data packets transmitted once, performing FEC error correction coding by taking the k data packets as units to obtain a certain number of redundant packets, dividing the k data packets and the redundant packets into m parts of data, wherein m is the number of links between a selected transmitting node and a receiving node, transmitting one part of data to the receiving node by each link, and receiving m parts of data combinations by the receiving node to obtain the original data packets. If a link fails in the transmission process, so that one to a preset number of data are lost, the lost data packet can be restored by decoding with error correction coding.
An embodiment of the present application relates to a method for transmitting a multi-link network, specifically:
1. link establishment and failure update
Link establishment as shown in fig. 1: data is to be transmitted between the client a and the client B, firstly, the client a and the client B are both connected with a management server, the management server distributes a connectable cloud forwarding server, A, B establishes a link pool R containing n links through a cloud server 1, cloud servers 2 and … and a cloud server n, the link pool R is represented as { R1, R2, … and Rn }, m links are selected as a transmission link group, and n > m is selected.
Link failure update, as in fig. 2: when the transmission link pool is used for transmission, the network state of each link is detected in real time, if a certain link has at least one of delay time exceeding preset delay time, packet loss rate exceeding preset packet loss rate and network failure, one available link is selected from the links remained in the link pool R as a standby link, the standby link replaces the link which is currently failed, and the standby link is added into a transmission link group to continue data transmission. Here, since the failed link is detected in real time, a new link is started in time for replacement, and the reliability and fluency of transmission are greatly improved.
2. Processing before data transmission and data transmission are as shown in fig. 3:
dividing the data to be transmitted into network data packets, and taking k data packets, namely { d } 1 ,d 2 ,…,d k Performing RS error correction coding to obtain { d } 1 ,d 2 ,…,d k ,c 1 ,c 2 …,c l (c) 1 ,c 2 …,c l And is a redundant packet.
Packet { d over sealed frame 1 ,d 2 ,…,d k ,c 1 ,c 2 …,c l Adding a frame number and a packet number to each data packet header in the transmission link group, equally dividing the data packets in each frame according to the number of links in the transmission link group, and sending out, namely, the number of the data packets sent by each link is L= (k+l)/m, wherein L is the number of the generated redundant packets, and m is the number of the transmission links; the values of k and m ensure that L is smaller than or equal to the number of data packets which can be corrected by the error correction code, namely, all data can still be decoded and recovered under the condition that all data packets of a certain link are lost, so that transmission is not influenced even if one or more links are in fault.
3. Data reception, as shown in fig. 4:
(1) The receiving end unpacks the data packet group received by each link to obtain packet header information including the frame number of the frame where the data packet group is located and the packet number of the data packet group. And detecting whether the data packets contained in the current frame are received or not through the frame numbers and the packet numbers, discarding the redundant packets if all the data packets are received, and directly sequencing and combining according to the packet numbers to recover the original data.
(2) Because the delay of each link is different, decoding is performed as long as the number of the data packets of the current frame detected to be received reaches the number of the data packets required by error correction coding, all the data packets of the current frame are recovered, and the data packets with the subsequent delay are discarded when the data packet group arrives.
(3) If the number of the received data packets of the current frame in the preset delay time does not reach the number of the data packets required by error correction coding, selecting a data packet group to send a normal working link, and requesting a sending end to retransmit the missing data packets.
Because the error correction coding is used at the transmitting end, and the data packets and the redundant packets are distributed to each link for transmission, the number of the packets distributed on each link by each frame of data packets is smaller than or equal to the number of the packets which can be recovered by the error correction coding, so that even if a certain link loses a packet or fails to cut a line, the original data can be completely recovered as long as the packets received on other links are in the correction condition of the error correction coding, the retransmission of the lost data of the failed link is avoided, and the reliability and fluency of network transmission are effectively improved.
Another embodiment of the present application provides a multi-link network transmission system, including:
a link pool establishment module: the method comprises the steps that a sending node and a receiving node are connected to a management server to obtain available information of a plurality of cloud forwarding servers, and the sending node and the receiving node establish links with the cloud forwarding servers respectively to form a link pool. The links in the pool of links are used for subsequent transmission of data.
And a link selection module: and selecting a plurality of links from the link pool to form a transmission link group between the two nodes, wherein the number of the links of the transmission link group is smaller than that of the links in the link pool.
And (3) link fault detection: detecting whether the network state of each link in the transmission link group is abnormal or not in real time; the anomaly of the network state includes: the delay time of transmission exceeds a preset delay time, the packet loss rate exceeds a preset packet loss rate and network faults.
And a data transmitting module: selecting k data packets from a plurality of data packets of target data to be transmitted, performing error correction by taking the k data packets as units to obtain redundant packets, and uniformly dividing all packets in a frame to each link in a transmission link group based on the number of links in the transmission link group to be transmitted by the k data packets and the redundant packet frame;
a first judging module: judging whether the time of the data packet group received by the receiving node exceeds a preset delay time or not;
and a second judging module: judging whether the number of the data packets received by the receiving node reaches a preset packet number or not;
a data receiving module; analyzing packet header information of data packet groups received from each link, checking whether all data packets are completely received, discarding redundant packets if the data packets are completely received, and sequencing and combining according to data packet numbers carried in the packet header information to obtain target data; if the number of the received data packets meets the number required by error correction coding and error correction, the missing data packets are recovered directly through error correction decoding, and the target data are obtained by sequencing and combining the data packet numbers carried in the packet header information.
A first judging module: judging whether the time of the data packet group received by the receiving node exceeds a preset delay time or not;
and a second judging module: judging whether the number of the data packets received by the receiving node reaches a preset packet number or not;
a data receiving module; analyzing packet header information of data packet groups received from each link, checking whether all data packets are completely received, discarding redundant packets if the data packets are completely received, and sequencing and combining according to data packet numbers carried in the packet header information to obtain target data; if the number of the received data packets meets the number required by error correction coding and error correction, the missing data packet group is recovered directly through error correction decoding, and the target data is obtained by sequencing and combining the data packet numbers carried in the packet header information.
The request module sends a request for selecting a data packet group from the transmission link groups to send a normal working link to the link selection module when the situation occurs, and simultaneously sends a request for retransmitting the missing data packet group to the sending node; the situation is at least one of the following: the time of the data packet group received by the receiving node exceeds the preset delay time, and the number of the data packets received by the receiving node does not reach the preset packet number.
Another embodiment of the present application further provides a multi-link network transmission system, including: and a link updating module: when the network state is abnormal, selecting a link from the rest links in the link pool to replace the link with abnormal current network state, adding the link into the transmission link group, and closing the link with abnormal current network state.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
according to the technical scheme, the transmission of the data is realized by adopting multiple links, when the packet loss rate of one or more links exceeds a preset threshold value, the delay time exceeds a preset threshold value or network faults and the like, error correction coding can be realized through redundant data packets transmitted by other normal links, lost data can be recovered in time, the integral transmission of the data is not influenced, and the reliability and fluency of network transmission are effectively improved.
According to the technical scheme, the data transmission is realized by adopting multiple links, when one link encounters the conditions of high packet loss rate, long delay time, network failure and the like, a new link is immediately started to replace a problem link to continue the data transmission, and the smoothness of the data transmission is ensured under the condition of not losing the data.
According to the technical scheme, the data transmission is realized by adopting multiple links, the problems of data transmission blocking, interruption and the like caused by network transmission congestion and network failure in the current single link data transmission process are effectively solved, and the network transmission reliability is improved.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which is also intended to be covered by the present invention.
Claims (6)
1. A method of multilink network transmission, the method comprising:
s1, selecting k data packets from a plurality of data packets of target data to be transmitted, and correcting errors by taking the k data packets as units to obtain redundant packets, wherein the k data packets and the redundant packets are combined to obtain a data packet group to be transmitted;
s2, packaging the data packets in the data packet group to be transmitted into a frame;
s3, based on the number of links of a pre-established transmission link group, equally dividing the frame to obtain a plurality of data packet groups, and after each data packet group adds packet header information, transmitting the data packet by any one link of the transmission link group, and starting transmission;
s4, the receiving node receives the data packet group transmitted by each link, and analyzes and synthesizes target data;
at least before S1, further comprising: based on the transmission data requirement between a sending node and the receiving node, establishing a link pool containing n links between the two nodes, selecting m links from the link pool, and establishing a transmission link group between the two nodes, wherein n is more than m;
s4, the receiving node receives the data packet group transmitted by each link, analyzes and synthesizes the target data, and specifically comprises the following steps:
s401, judging whether the time of the received data packet group exceeds a preset delay time; if not, then S402 is entered; if so, go to S404;
s402, analyzing the data packet groups received from each link based on the receiving node to obtain packet header information, judging whether all the data packet groups are received completely, if so, discarding redundant packets, and directly sequencing and combining according to the data packet numbers carried in the packet header information to obtain target data; if not, then S403 is entered;
s403, judging whether the number of the data packets received by the receiving node reaches a preset packet number; if so, decoding is carried out based on error correction codes carried in the redundant packets, all data packet groups of the current frame are recovered, and the target data are obtained according to the sequence combination of the data packet numbers carried in the packet header information; if not, then S404 is entered,
s404, selecting a data packet group from the pre-established transmission link groups to send a normal working link, requesting the sending end to resend the missing data packet group, and returning to S401.
2. The method for transmitting a multi-link network according to claim 1, wherein the establishing a link pool between two nodes comprising n links based on the transmission data requirement between the transmitting node and the receiving node comprises:
the sending node and the receiving node respectively establish connection with a management server;
the management server acquires n cloud forwarding servers for realizing data forwarding;
and establishing a link between the sending node and the receiving node based on each cloud forwarding server to form a link pool containing n links.
3. The method of claim 1, further comprising, at the time of the start-up transmission and during the link transmission:
detecting whether the network state of each link in the transmission link group is abnormal or not in real time; the anomaly of the network state includes: the delay time of transmission exceeds the preset delay time, and the packet loss rate exceeds the preset packet loss rate and network faults;
when the network state is abnormal, selecting a link from the rest links in the link pool to replace the link with abnormal current network state, and adding the link into the transmission link group.
4. The method for transmitting a multi-link network according to claim 1, wherein the frame is divided into a plurality of packet groups based on the number of links in the transmission link group, and the number of packets L in each packet group is calculated using formula (1):
L＝(k+l)/m (1)
and L is the total number of redundant packets in the data packet group to be transmitted, and the values of k and m ensure that L is smaller than or equal to the number of data packets which can be corrected by error correction coding.
5. A system for implementing the method for transmission in a multi-link network according to any one of claims 1-4, said system comprising:
a link pool establishment module: the method comprises the steps that a sending node and a receiving node are connected to a management server to obtain available information of a plurality of cloud forwarding servers, and the sending node and the receiving node respectively establish links with the cloud forwarding servers to form a link pool;
and a link selection module: selecting a plurality of links from a link pool to form a transmission link group between the two nodes, wherein the number of the links of the transmission link group is smaller than that of the links in the link pool;
and (3) link fault detection: detecting whether the network state of each link in the transmission link group is abnormal or not in real time;
and a data transmitting module: selecting k data packets from a plurality of data packets of target data to be transmitted, performing error correction by taking the k data packets as units to obtain redundant packets, and uniformly dividing all packets in a frame to each link in a transmission link group based on the number of links in the transmission link group to be transmitted by the k data packets and the redundant packet frame;
a first judging module: judging whether the time of the data packet group received by the receiving node exceeds a preset delay time or not;
and a second judging module: judging whether the number of the data packets received by the receiving node reaches a preset packet number or not;
a data receiving module; analyzing packet header information of data packet groups received from each link, checking whether all data packets are completely received, discarding redundant packets if the data packets are completely received, and sequencing and combining according to data packet numbers carried in the packet header information to obtain target data; if the number of the received data packets meets the number required by error correction coding and error correction, directly recovering the missing data packet group through error correction decoding, and sequencing and combining according to the number of the data packets carried in the packet header information to obtain target data;
the request module sends a request for selecting a data packet group from the transmission link groups to send a normal working link to the link selection module when the situation occurs, and simultaneously sends a request for retransmitting the missing data packet group to the sending node; the situation is at least one of the following: the time of the data packet group received by the receiving node exceeds the preset delay time, and the number of the data packets received by the receiving node does not reach the preset packet number.
6. The system of claim 5, wherein the system further comprises: and a link updating module: when the network state is abnormal, selecting a link from the rest links in the link pool to replace the link with abnormal current network state, adding the link into the transmission link group, and closing the link with abnormal current network state.
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