CN112422421A - A Multipath Data Packet Transmission Method for Heterogeneous Networks - Google Patents

Abstract

The present invention provides a multi-path data packet transmission method for heterogeneous networks. The method includes: performing data communication between multiple client devices and server devices through MMR‑AR multi-path heterogeneous links, receiving data packets sent from the client devices, and selecting from multiple heterogeneous links Sending link, after encapsulating the dedicated header of the sending link, the data packet is sent on the sending link; receiving data packets from the client device from multiple heterogeneous links, and comparing the received multiple After the data packets are parsed and aggregated, they are forwarded to the server device in turn. By applying the method of the present invention, the disorder problem of aggregated data flow is effectively reduced during multi-link transmission. The invention can ensure high data packet transmission efficiency even if the network quality estimation is inaccurate during multi-link transmission.

Description

A Multipath Data Packet Transmission Method for Heterogeneous Networks

technical field

The present invention relates to the technical field of heterogeneous network data communication, in particular to a multi-path data packet transmission method for heterogeneous networks.

Background technique

With the rapid development of high-speed rail technology, the demand for communication in a high-speed mobile environment is becoming more and more intense. However, a single wireless network cannot meet people's needs for Internet access, so people try to implement multi-link parallel communication by using a variety of heterogeneous wireless and wired networks. One of the main difficulties in multi-link parallel communication is to solve the disorder of data packets in parallel communication. In response to this problem, many methods have been proposed in static environments, all of which rely on the accurate estimation of link quality by scheduling algorithms. However, in a high-speed mobile environment, the link quality fluctuates violently, and the estimation of the link quality will not be accurate enough. Scheduling decisions based on such inaccurate estimates are unsatisfactory.

In order to solve the problem of Internet access in a high-speed mobile environment, an Earliest Completion First (ECF: Earliest Completion First) method is proposed in the prior art. The principle of the method is that the original data packet generated by the sender has multiple links that can be sent. When a data packet needs to be sent, the sender calculates the time it takes to send the data packet from different links at the time of sending. By comparison, the link with the shortest time is selected to send the packet.

The disadvantage of the above method for the earliest completion priority is that it is modified on the basis of the MPTCP (Multipath Transmission Control Protocol, Multipath Transmission Control Protocol) protocol. Due to the limitations of the MPTCP protocol, the data packets sent by it are the data packets generated by the device running the MPTCP protocol, and cannot forward the data packets sent from other devices to this device. The above reasons make the application of this method have great limitations, and cannot be used as a forwarding algorithm in routers.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a multi-path data packet transmission method for heterogeneous networks, so as to overcome the problems of the prior art.

In order to achieve the above objects, the present invention adopts the following technical solutions.

A multi-path data packet transmission method for heterogeneous networks, data communication is performed between multiple client devices and server devices through MMR-AR multi-path heterogeneous links, including:

After receiving the data packet sent by the client device, select a transmission link from multiple heterogeneous links, encapsulate the data packet with the dedicated header of the transmission link, and send the transmission link on the transmission link. data pack;

The data packets from the client device are received from multiple heterogeneous links, and the received multiple data packets are parsed and aggregated, and then forwarded to the server device in turn.

Preferably, after receiving the data packet sent by the client device, selecting a transmission link from multiple heterogeneous links, encapsulating the data packet with the dedicated header of the transmission link, and then in the transmission The data packet is sent on the link, including:

Receive the original data packet from the client device, remove all headers before the IP header of the original data packet, convert the original data packet into an IP data packet, and put the IP data packet into the cache;

According to the order in which the IP data packets arrive in the cache, the IP data packets are marked with dedicated sequence numbers, and according to the scheduling decision, the transmission link is selected for the IP data packets marked with the dedicated sequence numbers;

After encapsulating the special header of the sending link for the IP data packet marked with the special sequence number, the IP data packet is sent on the sending link.

Preferably, the special sequence number is marked for the IP data packet, including:

Before receiving the original data packet from the client device, set a 4-byte dedicated sequence number, and initialize the dedicated sequence number to 0; each time an original data packet is received from the client device, the updated dedicated sequence number is incremented by one, and the updated dedicated sequence number is added. Mark before IP packets.

Preferably, the dedicated header encapsulating the sending link for the IP data packet marked with a dedicated sequence number includes:

Before receiving the original data packet from the client device, obtain and store the IP addresses of all current heterogeneous links, and update the stored IP addresses of the heterogeneous links accordingly when the status of the heterogeneous links changes;

A private header is constructed with the IP address of the currently recorded sending link, and the private header is encapsulated before the IP data packet marked with the private sequence number.

Preferably, the data packets from the client device are received from multiple heterogeneous links, and the received multiple data packets are parsed and aggregated, and then forwarded to the server device in turn, including:

Continuously monitor the IP data packets from the client device on multiple heterogeneous links, and after receiving the IP data packets on the heterogeneous links, remove the dedicated headers and dedicated sequence numbers encapsulated in the IP data packets, and parse the IP data package information;

Send the parsed IP data packet into the cache, after marking the IP data packet with a special sequence number according to the order in which the IP data packet arrives in the cache, insert the IP data packet into the cache;

Take out the data packet with the smallest dedicated sequence number in the current cache as the target data packet, determine whether the target data packet is the data packet expected to be forwarded, if so, send the target data packet to the server device; if not, monitor and wait for new data package arrives.

Preferably, the sending the target data packet to the server device includes:

When the target data packet is decided to be forwarded, update the time when the data packet was forwarded last time to the current time, update the dedicated sequence number of the target data packet to the current value plus one, and update the expected data packet sequence number to the current value plus one;

According to the scheduling decision, select the transmission link for the updated IP data packet with the dedicated sequence number;

A dedicated header is constructed according to the IP address of the sending link, the dedicated header is encapsulated before the IP data packet with the updated dedicated sequence number, and the encapsulated IP data packet is sent to the server device.

Preferably, before the receiving the data packets from the client device from the multiple heterogeneous links, the method further includes:

When the aggregation process of the data packets from the client device is initialized, a 4-byte dedicated sequence number is set in the cache, and the dedicated sequence number is initialized to 0, and the last time the data packet was forwarded is initialized to 0;

Stores the IP addresses of all current heterogeneous links, updates the IP addresses of the corresponding heterogeneous links when the status of the heterogeneous links changes, and obtains the selected sending link according to the stored IP address information of all heterogeneous links 's IP address;

The sequence number record of the expected data packet is established, and the sequence number of the expected data packet is initialized to 1.

Preferably, the judging whether the target data packet is a data packet expected to be forwarded includes:

When the aggregation process is running, read the sequence number of the currently expected data packet;

Read the dedicated sequence number of the target data packet;

Compare the dedicated sequence number of the target packet with the sequence number of the expected packet;

If the dedicated sequence number of the target data packet is equal to the sequence number of the expected data packet, it is determined that the target data packet is the data packet expected to be forwarded;

If the dedicated sequence number of the target data packet is smaller than the sequence number of the expected data packet, it is judged that the target data packet is delayed in transmission, but it is still the data packet expected to be forwarded;

If the dedicated sequence number of the target data packet is greater than the sequence number of the expected data packet, it is determined that the target data packet is not the data packet expected to be forwarded temporarily;

Determine whether the forwarding waiting interval of the aggregation process has timed out. If so, the target data packet does not need to be forwarded; otherwise, the target data packet needs to be forwarded.

Preferably, whether the forwarding waiting interval for judging the aggregation process is overtime, if so, the target data packet does not need to be forwarded; otherwise, the target data packet needs to be forwarded, including:

Initialize and periodically update timeout thresholds;

When the aggregation process is initialized, set the timeout threshold and initialize the timeout threshold;

When the aggregation process is running, it continuously sends link detection packets to each heterogeneous link;

Whenever a probe packet of a heterogeneous link returns to the aggregation process, calculate the smooth round-trip delay of the probe packet;

Calculate and store the difference between the maximum and minimum smoothed round-trip delays in all heterogeneous links;

Periodically update the timeout threshold to 2 times the smoothed round-trip delay difference;

Compare the difference between the current moment and the moment when the packet was forwarded last time with the timeout threshold;

When the comparison result is greater than 0, the target packet needs to be forwarded;

When the comparison result is less than 0, the destination packet does not need to be forwarded.

Preferably, the data packets sent by the client device are received through the multi-link mobile router MMR, the data packets are sent on the heterogeneous link, the data packets from the client device on the heterogeneous link are received through the aggregation router AR, and the The received data packet is forwarded to the server device;

or,

Receive the data packets sent by the client device through the AR, send the data packets on the heterogeneous link, receive the data packets from the client device on the heterogeneous link through the MMR, and forward the received data packets to the server device .

It can be seen from the technical solutions provided by the above embodiments of the present invention that, by applying the methods of the embodiments of the present invention, the problem of out-of-order aggregated data streams is effectively reduced during multi-link transmission. The present invention makes it unnecessary to accurately estimate the network quality in an unpredictable network during multi-link transmission.

Additional aspects and advantages of the present invention will be set forth in part in the following description, which will be apparent from the following description, or may be learned by practice of the present invention.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a topology structure diagram of a heterogeneous network according to an embodiment of the present invention;

2 is a flowchart of a divergence process provided by an embodiment of the present invention;

FIG. 3 is a flowchart of a convergence process provided by an embodiment of the present invention;

FIG. 4 is a flowchart of an algorithm for judging whether a target data packet is a data packet expected to be forwarded according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

It will be understood by those skilled in the art that the singular forms "a", "an", "said" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components and/or groups thereof. It will be understood that when we refer to an element as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Furthermore, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as herein, are not to be taken in an idealized or overly formal sense. explain.

In order to facilitate the understanding of the embodiments of the present invention, the following will take several specific embodiments as examples for further explanation and description in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

A topology structure of a heterogeneous network provided by an embodiment of the present invention is shown in FIG. 1, and includes the following main functions: client equipment, server equipment, MMR (Multipath Mobile Router, multi-link mobile router) and AR (Aggregation Router, aggregation router). Multiple client devices and server devices communicate through MMR-AR multi-path heterogeneous links.

A multi-path data packet transmission method for a heterogeneous network that overcomes link unpredictability provided by the embodiment of the present invention is deployed on the MMR and the AR respectively. The processing flow of the method is shown in Figure 1, including the following processing steps:

Step A: Divergence process. That is, the process of receiving the original data packet from the client device, and then sending the data packet through multiple heterogeneous links with unpredictable states;

Step B: Aggregation process. That is, the process of receiving data packets from multiple unpredictable heterogeneous links, aggregating all the received data packets, and then forwarding them to the corresponding server device.

Since the communication through the MMR-AR is bidirectional, both the MMR device and the AR device deploy the divergence process and the convergence process. Both client and server devices can be deployed at AR devices and MMR devices.

The flow chart of the divergence process of step A is shown in Figure 2, including the following processing steps:

Step A1: When initializing the divergence process, set a 4-byte dedicated sequence number and initialize the dedicated sequence number to 0; each time an original data packet is received, the updated dedicated sequence number is incremented by one, and the updated dedicated sequence number is marked before the IP data packet . Obtain and store the IP addresses of all current heterogeneous links, and update the stored IP addresses of the heterogeneous links when the status of the heterogeneous links changes.

Receive the original data packet from the client device, remove all headers before the IP header of the original data packet, convert the original data packet into an IP data packet, and put the IP data packet into the cache;

Step A2: mark the updated dedicated sequence number for the IP data packet according to the order in which the IP data packet arrives in the cache;

Step A3: According to the scheduling decision, select a transmission link for the IP data packet marked with the dedicated sequence number;

The round-trip delay of all heterogeneous links is detected in an in-band or out-of-band manner. In this method, very accurate detection results are not required, and the packet distribution ratio of each link is calculated according to the reciprocal of the detected delay to generate a scheduling decision. .

Step A4: Construct a dedicated header with the IP address of the currently recorded transmission link, encapsulate the dedicated header before and after the IP data packet marked with the dedicated sequence number, and send the IP data packet on the transmission link to realize transparent transmission.

The flow chart of the aggregation process of step B is shown in Figure 3, which includes the following processing steps:

Step B1: When the aggregation process is initialized, a 4-byte dedicated sequence number is set in the cache, and the dedicated sequence number is initialized to 0. Initialize the last time the packet was forwarded to 0. Stores the IP addresses of all current links. When the link status changes, the IP address of the corresponding link is updated immediately. Obtain the IP address of the selected sending link according to the stored IP address information of all links. The sequence number record of the expected data packet is established, and the sequence number of the expected data packet is initialized to 1.

Continuously monitor all heterogeneous links with unpredictable states to see if data packets arrive, and any heterogeneous link will trigger the data packet aggregation process when a data packet arrives;

Step B2: after receiving the IP data packet on the heterogeneous link, remove the dedicated header and the dedicated sequence number encapsulated on the IP data packet, and parse the IP data packet information;

Step B3: When the aggregation process is started, a dynamic sorting cache is established. The parsed IP data packets are sent to the cache, and a special sequence number is marked for the IP data packets according to the order in which the IP data packets reach the cache. Each time the cache receives an IP data packet, the updated dedicated sequence number is incremented by one, and the updated dedicated sequence number is marked before the IP data packet, and the IP data packet is inserted into the cache with the dedicated sequence number of the marked IP data packet as the index condition.

Step B4: take out the data packet with the smallest dedicated sequence number in the current cache as the target data packet;

Step B5: determine whether the target data packet is the data packet expected to be forwarded, if so, enter step B6; if not, return to step B1, monitor and wait for the arrival of a new data packet;

Step B6: when the target data packet is decided to be forwarded, update the time when the data packet was forwarded last time to the current time, update the dedicated sequence number of the target data packet to the current value plus one, and update the expected data packet sequence number to the current value plus one. .

According to the scheduling decision, select the transmission link for the updated IP data packet with the dedicated sequence number;

The round-trip delay of all heterogeneous links is detected in an in-band or out-of-band manner. In this method, very accurate detection results are not required, and the packet distribution ratio of each link is calculated according to the reciprocal of the detected delay to generate a scheduling decision. .

Step B7: Construct a dedicated header according to the IP address of the sending link, encapsulate the dedicated header before the IP data packet with the updated dedicated serial number, send the encapsulated IP data packet to the server device, and clear the sent IP data packet in the cache. Relevant information in, realize transparent transmission, complete a data stream aggregation process, and return to step B3;

The algorithm flow of judging whether the target data packet is the data packet expected to be forwarded in step B5 is shown in Figure 4, including the following processing steps:

B5-1: When the aggregation process is running, read the sequence number of the currently expected data packet;

B5-2: Read the dedicated sequence number of the target data packet;

B5-3: Compare the dedicated sequence number of the target data packet with the sequence number of the expected data packet;

B5-3-1: If the dedicated sequence number of the target data packet is equal to the sequence number of the expected data packet, the target data packet is the data packet expected to be forwarded, and the return is yes;

B5-3-2: If the dedicated sequence number of the target data packet is smaller than the sequence number of the expected data packet, the target data packet is delayed for some time during transmission due to some reasons, but it is still the data packet expected to be forwarded, and the return is yes;

B5-3-3: If the dedicated sequence number of the target data packet is greater than the sequence number of the expected data packet, the target data packet is temporarily not the data packet expected to be forwarded, and enters B5-4;

B5-4: Determine whether the forwarding waiting interval of the aggregation process has timed out;

B5-4-1: Initialize and periodically update timeout threshold;

B5-4-1-1: When the aggregation process is initialized, set the timeout threshold and initialize the timeout threshold;

B5-4-1-2: When the aggregation process is running, continuously send link detection packets to each heterogeneous link;

B5-4-1-3: Whenever the probe data packet of a link returns to the aggregation process, calculate the smooth round-trip delay of the probe data packet;

B5-4-1-4: Calculate and store the difference between the maximum and minimum smoothed round-trip delays in all heterogeneous links;

B5-4-1-5: Periodically update the timeout threshold to 2 times the smoothed round-trip delay difference;

B5-4-2: Compare the difference between the current moment and the moment when the data packet was forwarded last time and the timeout threshold;

When the comparison result of B5-4-2-1 is greater than 0, the target data packet needs to be forwarded, and the return is yes;

When the comparison result of B5-4-2-2 is less than 0, the target data packet does not need to be forwarded, and returns No;

To sum up, by applying the method of the embodiment of the present invention, the problem of out-of-order aggregated data flow can be effectively reduced during multi-link transmission. The present invention makes it unnecessary to accurately estimate the network quality in an unpredictable network during multi-link transmission. The invention can ensure high data packet transmission efficiency even if the network quality estimation is inaccurate during multi-link transmission.

The method of the embodiment of the present invention can be applied to routers such as MMR and AR as forwarding algorithms.

Those of ordinary skill in the art can understand that the accompanying drawing is only a schematic diagram of an embodiment, and the modules or processes in the accompanying drawing are not necessarily necessary to implement the present invention.

From the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art. The computer software products can be stored in storage media, such as ROM/RAM, magnetic disks, etc. , CD, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the apparatus or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for related parts. The apparatus and system embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, It can be located in one place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. A multi-path data packet transmission method of a heterogeneous network is characterized in that data communication is carried out between a plurality of client devices and a server device through MMR-AR multi-path heterogeneous links, and the method comprises the following steps:

receiving a data packet sent by client equipment, selecting a sending link from a plurality of heterogeneous links, encapsulating the data packet into a special header of the sending link, and then sending the data packet on the sending link;

and receiving the data packets from the client equipment from a plurality of heterogeneous links, analyzing and converging the received data packets, and sequentially forwarding the data packets to the server equipment.

2. The method of claim 1, wherein the receiving a data packet sent by a client device, selecting a transmission link from a plurality of heterogeneous links, encapsulating the data packet with a dedicated header of the transmission link, and sending the data packet on the transmission link, comprises:

receiving an original data packet from the client device, removing all headers before an IP header of the original data packet, converting the original data packet into an IP data packet, and putting the IP data packet into a cache;

according to the sequence of IP data packets arriving at the cache, marking special serial numbers for the IP data packets, and according to a scheduling decision, selecting a sending link for the IP data packets marked with the special serial numbers;

and after the special header of the sending link is packaged for the IP data packet marked with the special sequence number, the IP data packet is sent on the sending link.

3. The method of claim 2, wherein said marking the IP packet with a dedicated sequence number comprises:

before receiving an original data packet from a client device, setting a special serial number of 4 bytes, and initializing the special serial number to 0; each time an original data packet is received from the client device, the private sequence number is updated by one, and the updated private sequence number is marked before the IP data packet.

4. The method of claim 2, wherein encapsulating the private header of the transmit link for the IP packet marked with the private sequence number comprises:

before receiving an original data packet from client equipment, obtaining and storing IP addresses of all current heterogeneous links, and when the state of the heterogeneous links changes, correspondingly updating the stored IP addresses of the heterogeneous links;

and constructing a special header by using the IP address of the currently recorded sending link, and encapsulating the special header in front of the IP data packet marked with the special sequence number.

5. The method of claim 1, wherein the receiving the data packets from the client device from the multiple heterogeneous links, analyzing and aggregating the received multiple data packets, and sequentially forwarding the data packets to the server device comprises:

continuously monitoring IP data packets from the client equipment on a plurality of heterogeneous links, removing special headers and special serial numbers packaged on the IP data packets after the IP data packets are received on the heterogeneous links, and analyzing the information of the IP data packets;

sending the analyzed IP data packet into a cache, marking a special serial number for the IP data packet according to the sequence of the IP data packet reaching the cache, and inserting the IP data packet into the cache;

taking out the data packet with the minimum special sequence number in the current cache as a target data packet, judging whether the target data packet is a data packet expected to be forwarded or not, and if so, sending the target data packet to the server equipment; if not, listening and waiting for a new data packet to arrive.

6. The method of claim 5, wherein said sending the target packet to a server device comprises:

after the target data packet is determined to be forwarded, updating the time of forwarding the data packet last time to the current time, updating the special serial number of the target data packet to the current value plus one, and updating the serial number of the expected data packet to the current value plus one;

selecting a transmission link for the IP data packet with the updated special serial number according to the scheduling decision;

and constructing a special header according to the IP address of the transmission link, encapsulating the special header before the IP data packet with the updated special sequence number, and transmitting the encapsulated IP data packet to the server-side equipment.

7. The method of claim 6, wherein prior to receiving the data packet from the client device over the plurality of heterogeneous links, further comprising:

when the convergence process of the data packet from the client device is initialized, setting a special serial number of 4 bytes in a cache, initializing the special serial number to be 0, and initializing the time of forwarding the data packet at the last time to be 0;

storing the IP addresses of all the current heterogeneous links, updating the IP addresses of the corresponding heterogeneous links when the states of the heterogeneous links change, and acquiring the IP addresses of the selected sending links according to the stored IP address information of all the heterogeneous links;

and establishing a serial number record of the expected data packet, and initializing the serial number of the expected data packet to be 1.

8. The method of claim 7, wherein said determining whether the destination packet is an expected forwarding packet comprises:

when the convergence process is operated, reading the sequence number of the current expected data packet;

reading the special serial number of the target data packet;

comparing the special sequence number of the target data packet with the sequence number of the expected data packet;

if the special serial number of the target data packet is equal to the serial number of the expected data packet, judging that the target data packet is the expected data packet to be forwarded;

if the special serial number of the target data packet is smaller than the serial number of the expected data packet, judging that the target data packet delays time in transmission but is still the expected data packet to be forwarded;

if the special serial number of the target data packet is larger than the serial number of the expected data packet, judging that the target data packet is not the expected data packet to be forwarded temporarily;

judging whether the forwarding waiting interval of the convergence process is overtime or not, if so, the target data packet does not need to be forwarded; otherwise, the destination packet needs to be forwarded.

9. The method of claim 8, wherein said determining whether the forwarding waiting interval of the aggregation procedure is over time, if so, the target packet does not need to be forwarded; otherwise, the target packet needs to be forwarded, including:

initializing and regularly updating a timeout threshold;

when the convergence process is initialized, setting a timeout threshold and initializing the timeout threshold;

when the convergence process is operated, continuously sending a link detection data packet to each heterogeneous link;

when the detection data packet of one heterogeneous link returns to the convergence process, calculating the smooth round-trip delay of the detection data packet;

calculating and storing the difference value between the maximum value and the minimum value of the smooth round-trip delay in all heterogeneous links;

periodically updating the overtime threshold value to be 2 times of the smooth round-trip delay difference value;

comparing the difference value between the current time and the last time of forwarding the data packet with an overtime threshold;

when the comparison result is greater than 0, the target data packet needs to be forwarded;

when the comparison result is less than 0, the destination packet does not need to be forwarded.

10. The method according to any one of claims 1 to 9, comprising:

receiving a data packet sent by client equipment through a multi-link mobile router (MMR), sending the data packet on a heterogeneous link, receiving the data packet from the client equipment on the heterogeneous link through a convergence router (AR), and forwarding the received data packet to server equipment;

or,

the data packet sent by the client device is received through the AR, the data packet is sent on the heterogeneous link, the data packet from the client device on the heterogeneous link is received through the MMR, and the received data packet is forwarded to the server device.

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