CN107211010B - A data transmission method and device - Google Patents

Abstract

The embodiment of the invention provides data transmission method and equipment, which relate to the field of communication and can utilize a double-stack address of UE to access a server to improve the data transmission rate between the UE and the server.

Description

A data transmission method and device

technical field

The present invention relates to the field of communications, and in particular, to a data transmission method and device.

Background technique

With the increasing shortage of address resources of the fourth edition of the Internet Interconnection Protocol (full name in English: Internet Protocol version 4, English abbreviation: IPv4), mobile communication networks are constantly moving towards supporting the sixth version of the Internet Protocol version (full name in English: Internet Protocol version 6, English abbreviation: IPv6) address transition. The 3rd Generation Partnership Project (English full name: 3rd Generation Partnership Project, English abbreviation: 3GPP) protocol supports the allocation of dual-stack addresses to user equipment (English full name: User Equipment, English abbreviation: UE), that is, assigning an IPv4 address and / or an IPv6 address.

When both the UE and the server support dual-stack addresses and the Multi-Path Transmission Control Protocol (English full name: Multi-Path Transmission Control Protocol, English abbreviation: MPTCP), during a service execution process, the UE can obtain an IPv4 address and an IPv6 address, Establish two subflows (full English name: Subflow) with the IPv4 address and IPv6 address of the server, and perform data transmission with the server through the two subflows.

However, when the server does not support dual-stack addresses, the UE can only access the server through the IP address type supported by the server, and cannot access the server through another IP address. For example, if a server only supports an IPv4 address, the UE can only access the server through the IPv4 address, but cannot access the server through the IPv6 address, resulting in a low data transmission rate.

SUMMARY OF THE INVENTION

The present application provides a data transmission method and device, which can use the dual-stack address of the UE to access the server when the server does not support dual-stack addresses, thereby improving the data transmission rate between the UE and the server.

To achieve the above object, the application adopts the following technical solutions:

In a first aspect, a data transmission method is provided. After receiving the access request message sent by the user equipment UE, the MPTCP proxy establishes a first connection with the server according to the IP address of the server carried in the access request message, and establishes a first connection with the server according to the IP address of the server carried in the access request message. An IP address establishes a second connection with the UE, and associates the second connection with the first connection, so as to complete packet forwarding between the UE and the server. The second connection is an MPTCP connection, including a first subflow established by the UE with the MPTCP proxy using the first IP address, and a second subflow established by the UE using the second IP address with the MPTCP proxy. The UE can use the dual-stack address to access the server through the MPTCP proxy, thereby improving the data transmission rate between the UE and the server.

With reference to the first aspect, in a possible implementation manner, the MPTCP proxy may dynamically adjust the number of substreams included in the first connection and the second connection according to the service data volume of the UE, so as to adjust the communication between the UE and the server. data transfer rate.

In a second aspect, a data transmission device is provided, including a computer-readable medium for storing program codes of the solutions of the present application, where the program codes include instructions for executing the data transmission method provided in the first aspect.

In a third aspect, another data transmission device is provided, including a processor, a transceiver, a memory, and a bus, wherein the processor, the transceiver, and the memory are connected to each other through the bus; for executing the first The program code of the data transmission method provided by the aspect is stored in the memory, and is controlled and executed by the processor.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art 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 for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic diagram illustrating an application scenario of a data transmission method provided by an embodiment of the present invention;

2 is a schematic flowchart of a data transmission method provided by an embodiment of the present invention;

3 is a schematic structural diagram of a data transmission apparatus provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another data transmission apparatus provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a data transmission method, which is applied to a Multi-Path Transmission Control Protocol (full English name: Multi-Path Transmission Control Protocol, English abbreviation: MPTCP) proxy. Combined with the application scenario shown in FIG. 1, the user equipment (full name in English: User Equipment, abbreviation: UE) passes the packet data network gateway (full name in English: packet data network gateway, English abbreviation: PGW) and multi-path transmission control protocol (English abbreviation: PGW) Full name: Multi-Path Transmission Control Protocol, English abbreviation: MPTCP) proxy access server. After the UE accesses the mobile network, it establishes a connection with the PGW, and the PGW device may include an MPTCP proxy or both are independent. When the PGW device includes the MPTCP proxy, the PGW can choose to enable or disable the function of the MPTCP proxy according to the IP address types of the UE and the server. Specifically, if the IP address obtained by the UE from the PGW is the same type of IP address as the IP address of the server, for example, the same IPv4 address or IPv6 address, the PGW does not need to enable the MPTCP proxy function. If the UE obtains two IP addresses from the PGW, including an IPv4 address and an IPv6 address, the PGW enables the function of MPTCP proxy. When the PGW device and the MPTCP proxy are independent, the MPTCP proxy is located between the PGW and the server.

The data transmission method provided by the present invention involves two types of IP addresses. In the embodiment of the present invention, only two types of IP addresses, the IPv4 address and the IPv6 address, are used as examples for description. Of course, this does not mean that the present invention is only applicable to IPv4 addresses and IPv6 addresses.

The UE acquires two different types of IP addresses, including an IPv4 address and an IPv6 address, and uses these two IP addresses to establish an MPTCP connection with the MPTCP proxy. The MPTCP proxy can establish a normal TCP connection with the server, or establish an MPTCP connection.

The difference between the MPTCP connection between the MPTCP proxy and the server, and the MPTCP connection between the MPTCP proxy and the UE is that the MPTCP connection established between the MPTCP proxy and the UE includes the subflow (full English name: Subflow) established through the IPv4 address, and Subflows established by IPv6 addresses. On the other hand, the MPTCP connection established by the MPTCP proxy and the server only includes substreams established through either an IPv4 address or an IPv6 address. For example, if the server only supports IPv4 addresses, the MPTCP connection between the MPTCP proxy and the server only includes substreams established through IPv4 addresses.

In the embodiment of the present invention, the first IP address and the second IP address are used to describe two different types of IP addresses obtained by the UE, one of the first IP address and the second IP address is an IPv4 address, and the other is an IPv4 address. IPv6 address. The IP address of the server is an IPv4 address or an IPv6 address. The embodiment of the present invention is described by taking the case where the first IP address and the IP address of the server are IPv4 addresses, and the second IP address is an IPv6 address as an example.

Example

An embodiment of the present invention provides a data transmission method, which is applied to an MPTCP proxy. Referring to FIG. 2, the method includes the following steps:

201. Receive an access request message sent by a user equipment UE.

The UE sends an access request message to the PGW to request access to the server. The access request message includes the IP address of the server and the first IP address of the UE. The first IP address and the IP address of the server are IP addresses of the same type, that is, both are IPv4 addresses.

The PGW forwards the access request message to the MPTCP proxy, or only sends the IP address of the server and the first IP address to the MPTCP proxy. In order to facilitate the MPTCP proxy to establish a connection with the server and the UE respectively.

202. Establish a connection with the server according to the IP address of the server.

A connection is established between the MPTCP proxy and the server, including the following two situations.

In the first case, the server does not support MPTCP. In this case, the MPTCP proxy uses the access IP address to establish a TCP connection with the server according to the IP address of the server. The access IP address and the server address are IP addresses of the same type, that is, IPv4 addresses.

The access IP address may be the first IP address of the UE, that is, after receiving the access request message sent by the UE, the MPTCP proxy establishes a TCP connection with the server by using the first IP address carried in the access request message.

Of course, the access IP address may also be other IPv4 addresses, for example, the access IP address is an IP address preconfigured for the MPTCP proxy.

In the second case, the server supports MPTCP. At this time, the MPTCP agent establishes an MPTCP connection with the server according to the IP address of the server, so as to improve the data throughput rate between the MPTCP agent and the server.

The MPTCP connection between the MPTCP proxy and the server may include at least one substream. One of the substreams corresponds to an IP address pair, and an IP address pair includes an IP address of the MPTCP proxy and an IP address of the server, where the IP address of the MPTCP proxy refers to the IP address used by the MPTCP proxy and the server to establish a substream , the IP address of the server side, which refers to the IP address used by the server to establish the substream with the MPTCP proxy. Since the server supports only one type of IP address, the IP address of the MPTCP proxy and the IP address of the server are of the same type.

Optionally, the number of IP addresses of the server is 1, that is, the IP address of the server only includes the IP address of the server included in the access request message. In this case, the MPTCP proxy establishes a subflow with the server using at least one access IP address. The access IP address and the IP address of the server are the same type of IP address. When the number of access IP addresses is 1, the access IP address may be the first IP address. When the number of access IP addresses is greater than 1, the access IP address may further include an IP address pre-configured for the MPTCP proxy. As shown in Table 1, in the IP address pair corresponding to a substream, the IP address of the MPTCP proxy can be the first IP address, or the access IP address. IP address, which is represented by IP address A in Table 1.

Table I

Optionally, if the number of IP addresses of the server is greater than 1, the MPTCP proxy uses the first IP address to establish the first substream with the server according to the IP address of the server included in the access request message, and the server sends the MPTCP proxy through the substream. Send another IP address. In this case, the MPTCP proxy and server establish other substreams based on the first substream. Combining with Table 2, among IP address pairs corresponding to different substreams, the IP addresses of the servers may be different.

Table II

Further optionally, when the number of IP addresses of the server is greater than 1, and no access IP address is pre-configured for the MPTCP proxy, the IP address of the MPTCP proxy may only include the first IP address, and the MPTCP proxy still remains. Multiple sub-streams can be established with the server. Among the IP address pairs corresponding to different sub-streams, the IP addresses of the MPTCP proxy end are all the first IP addresses, and the IP addresses of the server end are different.

203. Establish a second connection with the UE according to the first IP address.

The second connection is an MPTCP connection. The second connection includes the first subflow and the second subflow. In conjunction with Table 3, the process of establishing the first sub-flow and the second sub-flow between the MPTCP proxy and the UE is described as follows:

Table 3

The UE supports dual stack addresses, and the IP address of the UE includes a first IP address and a second IP address, and the first IP address and the second IP address are different types of IP addresses. In this embodiment, the first IP address is an IPv4 address, and the second IP address is an IPv6 address. The IP address of the server may be an IPv4 address or an IPv6 address. Here, the case where the IP address of the server is an IPv4 address is used as an example for description.

After receiving the access request message, the MPTCP proxy uses the IP address of the server to establish a first subflow with the UE according to the first IP address of the UE. With reference to Table 3, the IP address of the UE corresponding to the first subflow is the first IP address, and the IP address of the MPTCP proxy is the IP address of the server.

After the first sub-flow is established, the MPTCP proxy and the UE further establish the second sub-flow. With reference to Table 3, the UE side IP address corresponding to the second subflow is the second IP address, and the MPTCP proxy side IP address is the proxy IP address. The proxy IP address is an IP address pre-configured for the MPTCP proxy, and the proxy IP address and the second IP address are IP addresses of the same type, that is, an IPv6 address.

There are two ways to establish the second subflow. The first way is that the MPTCP proxy sends the proxy IP address to the UE through the first subflow, and the UE uses the second IP address to establish the second subflow with the MPTCP proxy according to the proxy IP address. Another way is that the UE sends the second IP address to the MPTCP proxy through the first subflow, and the MPTCP proxy uses the proxy IP address to establish the second subflow with the UE according to the second IP address. The two methods are described as follows:

In the first manner, the UE sets the MP_CAPABLE flag in the TCP message sent to the MPTCP proxy through the first subflow, and queries the MPTCP proxy whether the second MPTCP subflow can be established. After the MPTCP proxy returns an MP_CAPABLE ACK message to the UE, it sends the proxy IP address to the UE through the ADD_ADDR option.

After receiving the proxy IP address, the UE sends a TCP message with the MP_JOIN flag set to the proxy IP address by using the second IP address, and requests to establish a second subflow. The MPTCP proxy returns an ACK message of MP_JOIN to the UE, and the establishment of the second stream is completed.

In the second manner, after the UE receives the MP_CAPABLE ACK message returned by the MPTCP proxy, the UE sends the second IP address to the MPTCP proxy through the ADD_ADDR option.

After receiving the second IP address, the MPTCP proxy uses the proxy IP address to send a TCP packet with the MP_JOIN flag set to the second IP address, requesting the establishment of the second substream. The UE returns an ACK message of MP_JOIN to the MPTCP proxy, and the establishment of the second stream is completed.

204. Associate the first connection with the second connection.

The MPTCP proxy associates the first connection with the second connection, and the association is used for the UE's access to the server. After the first connection is associated with the second connection, the MPTCP proxy forwards the packets received from the UE through the first connection to the server through the second connection, and forwards the packets received from the server through the second connection through the first connection. The connection is forwarded to the UE, i.e. the UE can access the server through the MPTCP proxy. In the prior art, if the server only supports an IPv4 address, the UE can only access the server through the IPv4 address. If the server only supports IPv6 addresses, the UE can only access the server through the IPv6 address. In the embodiment of the present invention, the MPTCP proxy establishes an MPTCP connection with the UE, and the UE can simultaneously transmit data through the first substream and the second substream, thereby Using the dual stack address of the UE to access the server, the data transmission rate between the UE and the server is improved.

205. Delete one of the first substream and the second substream according to the service data volume of the UE.

Step 205 is an optional step.

The data transmission rate between the UE and the server is also affected by the first connection and the second connection. The MPTCP proxy can dynamically adjust the number of substreams included in the first connection and the second connection according to the service data volume of the UE. To adjust the data transmission rate between the UE and the server.

Specifically, it includes deleting one of the first sub-stream and the second sub-stream when the amount of service data is less than the first preset threshold, and re-establishing the deleted sub-stream when the amount of service data exceeds the second preset threshold. subflow. The second preset threshold is greater than or equal to the first preset threshold. It should be pointed out that which of the two substreams is deleted has nothing to do with the types of IP addresses supported by the server. For example, if the server only supports IPv4, the proxy server can delete the first sub-flow (IPv4 sub-flow), so that the MPTCP proxy and the UE are connected through the second sub-flow (IPv6 sub-flow), and the MPTCP proxy and the server are connected by using IPv4 The address pair establishes a TCP or MPTCP connection. The MPTCP proxy adapts and forwards the IPv6 data packets on the UE side and the IPv4 data packets on the server side. After the first substream is deleted, the UE can still access the server normally through the MPTCP proxy.

Similarly, when the MPTCP proxy establishes the MPTCP connection with the server, the number of sub-streams can also be dynamically adjusted, so that the respective data transmission rates of the first connection and the second connection are adapted.

In the data transmission method provided by the embodiment of the present invention, the MPTCP proxy establishes a second connection with the UE by receiving the access request message sent by the UE, establishes the first connection with the server, and associates the second connection with the first connection to Complete the packet forwarding between the UE and the server. The second connection is an MPTCP connection, including a first subflow established by the UE with the MPTCP proxy using the first IP address, and a second subflow established by the UE using the second IP address with the MPTCP proxy. The UE can use the dual-stack address to access the server through the MPTCP proxy, thereby improving the data transmission rate between the UE and the server.

Based on the embodiment corresponding to FIG. 2 , an embodiment of the present invention further provides a data transmission device, which is used to execute the function completed by the MPTCP proxy in the above embodiment. 3, the data transmission device 30 includes:

The receiving unit 301 is configured to receive the access request message sent by the UE. The UE supports dual stack addresses, the IP address of the UE includes a first IP address and a second IP address, the first IP address and the second IP address are different types of IP addresses, and the access request message includes the IP address of the server and the first IP address. IP address, the first IP address and the IP address of the server are IP addresses of the same type.

The first connection unit 302 is configured to establish a first connection with the server according to the IP address of the server received by the receiving unit 301 .

The second connection unit 303 is configured to establish a second connection with the UE according to the first IP address received by the receiving unit 301 , the second connection is an MPTCP connection, and the second connection includes a first substream and a second substream. The first subflow is a subflow established by the UE using the first IP address and the data transmission device 30 using the IP address of the server, and the first subflow is used by the UE to send the second IP address to the data transmission device 30, or the data transmission device 30 sends a proxy IP address to the UE, the proxy IP address and the second IP address are IP addresses of the same type, and the second subflow is a subflow established by the UE using the second IP address and the data transmission device 30 using the proxy IP address.

The connection management unit 304 is configured to associate the first connection with the second connection, and the association is used for the UE to access the server.

Optionally, the first connection unit 302 is specifically configured to establish a TCP connection with the server according to the IP address of the server received by the receiving unit 301 .

Optionally, the first connection unit 302 is specifically configured to establish an MPTCP connection with the server according to the IP address of the server received by the receiving unit 301 .

Optionally, the second connection unit 303 is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address received by the receiving unit 301 .

The receiving unit 301 is further configured to receive the second IP address sent by the UE through the first substream.

The second connection unit 303 is further configured to establish a second sub-flow with the UE by using the proxy IP address according to the second IP address received by the receiving unit 301 .

Optionally, the second connection unit 303 is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address received by the receiving unit 301 .

The data transmission device 30 further includes a sending unit 305, configured to send the proxy IP address to the UE through the first subflow, so that the UE can establish a second subflow with the data transmission device 30 using the second IP address according to the proxy IP address.

Optionally, the second connection unit 303 is further configured to delete one of the first substream and the second substream according to the service data volume of the UE.

The data transmission device provided by the embodiment of the present invention establishes a second connection with the UE by receiving an access request message sent by the UE, establishes a first connection with the server, and associates the second connection with the first connection, so as to complete the UE Packet forwarding with the server. The second connection is an MPTCP connection, including a first subflow established by the UE with the MPTCP proxy using the first IP address, and a second subflow established by the UE using the second IP address with the MPTCP proxy. The UE can use the dual-stack address to access the server through the data transmission device, thereby improving the data transmission rate between the UE and the server.

Based on the embodiment corresponding to FIG. 2 , an embodiment of the present invention further provides a data transmission device, which is used to execute the function completed by the MPTCP proxy in the above embodiment. Referring to FIG. 4 , the data transmission device 40 includes a processor 401 , a transceiver 402 , a memory 403 and a bus 404 , and the processor 401 , the transceiver 402 and the memory 403 are connected to each other through the bus 404 .

The program code for implementing the solution of the present invention is stored in the memory 403, and the execution is controlled by the processor 401.

The memory 403 may include a volatile memory 403 (English: volatile memory), such as random-access memory (English: random-access memory, abbreviation: RAM). The memory 403 may also include non-volatile memory (English: non-volatile memory), such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English: solid-state drive, abbreviation: SSD). Memory 403 may also include a combination of the types of memory described above.

The processor 401 may be a central processing unit (full name: Central Processing Unit, abbreviated as: CPU), or a combination of a CPU and a hardware chip. The above hardware chip may be a network processor (English: network processor, abbreviation: NP), an application-specific integrated circuit (English: application-specific integrated circuit, abbreviation: ASIC), a programmable logic device (English: programmable logic device, abbreviation: PLD) ) or any combination thereof. The above-mentioned PLD may be a complex programmable logic device (English: complex programmable logic device, abbreviation: CPLD), a field programmable gate array (English: field-programmable gate array, abbreviation: FPGA), a general-purpose array logic (English: generic array logic, abbreviation: GAL) or any combination thereof.

The processor 401 is used to call the program code in the memory 403. In a possible implementation manner, when the above program is executed by the processor 401, the following functions are implemented:

The transceiver 402 is configured to receive an access request message sent by the UE. The UE supports dual stack addresses, the IP address of the UE includes a first IP address and a second IP address, the first IP address and the second IP address are different types of IP addresses, and the access request message includes the IP address of the server and the first IP address. IP address, the first IP address and the IP address of the server are IP addresses of the same type.

The processor 401 is configured to establish a first connection with the server according to the IP address of the server.

The processor 401 is further configured to establish a second connection with the UE according to the first IP address, the second connection is an MPTCP connection, and the second connection includes the first sub-flow and the second sub-flow. The first subflow is a subflow established by the UE using the first IP address and the data transmission device 40 using the IP address of the server, and the first subflow is used by the UE to send the second IP address to the data transmission device 40, or the data transmission device 40 sends a proxy IP address to the UE, the proxy IP address and the second IP address are IP addresses of the same type, and the second subflow is a subflow established by the UE using the second IP address and the data transmission device 40 using the proxy IP address.

The processor 401 is further configured to establish an association between the first connection and the second connection, and the association is used for the UE to access the server.

Optionally, the processor 401 is specifically configured to establish a TCP connection with the server according to the IP address of the server.

Optionally, the processor 401 is specifically configured to establish an MPTCP connection with the server according to the IP address of the server.

Optionally, the processor 401 is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address.

The transceiver 402 is further configured to receive the second IP address sent by the UE through the first substream.

The processor 401 is further configured to use the proxy IP address to establish the second subflow with the UE according to the second IP address.

Optionally, the processor 401 is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address.

The transceiver 402 is further configured to send the proxy IP address to the UE through the first subflow, so that the UE can establish a second subflow with the data transmission device 40 using the second IP address according to the proxy IP address.

Optionally, the processor 401 is further configured to delete one of the first substream and the second substream according to the service data volume of the UE.

The data transmission device provided by the embodiment of the present invention establishes a second connection with the UE by receiving an access request message sent by the UE, establishes a first connection with the server, and associates the second connection with the first connection, so as to complete the UE Packet forwarding with the server. The second connection is an MPTCP connection, including a first subflow established by the UE with the MPTCP proxy using the first IP address, and a second subflow established by the UE using the second IP address with the MPTCP proxy. The UE can use the dual-stack address to access the server through the data transmission device, thereby improving the data transmission rate between the UE and the server.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (18)

1. a data transmission method, applied to the multi-path transmission control protocol MPTCP proxy, is characterized in that, comprises: Receive an access request message sent by the user equipment UE; wherein the UE supports dual-stack addresses, the IP address of the UE's Internet Protocol includes a first IP address and a second IP address, the first IP address and the first IP address Two IP addresses are different types of IP addresses, the access request message includes the IP address of the server and the first IP address, and the first IP address and the IP address of the server are the same type of IP address; establishing a first connection with the server according to the IP address of the server; Establish a second connection with the UE according to the first IP address, where the second connection is an MPTCP connection, and the second connection includes a first sub-flow and a second sub-flow; wherein the first sub-flow a sub-flow established for the UE to use the first IP address and the MPTCP proxy to use the server's IP address, the first sub-flow for the UE to send the second IP to the MPTCP proxy address, or the MPTCP proxy sends a proxy IP address to the UE, the proxy IP address and the second IP address are IP addresses of the same type, and the second subflow is for the UE to use the second IP address. IP address and a substream established by the MPTCP proxy using the proxy IP address; The first connection is associated with the second connection, and the association is used for the UE's access to the server. 2. The data transmission method according to claim 1, wherein the establishing a first connection with the server according to the IP address of the server comprises: According to the IP address of the server, a transmission control protocol TCP connection is established with the server. 3. The data transmission method according to claim 1, wherein the establishing a first connection with the server according to the IP address of the server comprises: According to the IP address of the server, establish an MPTCP connection with the server. 4. The data transmission method according to claim 1 or 3, wherein the establishing a second connection with the UE according to the first IP address comprises: According to the first IP address, use the IP address of the server to establish the first subflow with the UE; The second IP address sent by the UE is received through the first sub-flow, and the second sub-flow is established with the UE by using the proxy IP address according to the second IP address. 5. The data transmission method according to claim 1 or 3, wherein the establishing a second connection with the UE according to the first IP address comprises: According to the first IP address, use the IP address of the server to establish the first subflow with the UE; The proxy IP address is sent to the UE through the first subflow, so that the UE uses the second IP address to establish the second subflow with the MPTCP proxy according to the proxy IP address. 6. The data transmission method according to any one of claims 1-3, wherein the method further comprises: One of the first sub-stream and the second sub-stream is deleted according to the traffic data volume of the UE. 7. A data transmission device, characterized in that, comprising: a receiving unit, configured to receive an access request message sent by a user equipment UE; wherein the UE supports dual-stack addresses, the IP address of the UE's Internet Protocol includes a first IP address and a second IP address, and the first IP address The IP address and the second IP address are different types of IP addresses, the access request message includes the IP address of the server and the first IP address, and the first IP address and the IP address of the server are of the same type IP address; a first connection unit, configured to establish a first connection with the server according to the IP address of the server received by the receiving unit; a second connection unit, configured to establish a second connection with the UE according to the first IP address received by the receiving unit, where the second connection is an MPTCP connection, and the second connection includes a first sub-connection flow and a second sub-flow; wherein, the first sub-flow is a sub-flow established by the UE using the first IP address and the data transmission device using the IP address of the server, and the first sub-flow is The flow is for the UE to send the second IP address to the data transmission device, or the data transmission device to send a proxy IP address to the UE, where the proxy IP address and the second IP address are of the same type. IP address, the second subflow is a subflow established by the UE using the second IP address and the data transmission device using the proxy IP address; A connection management unit, configured to associate the first connection with the second connection, where the association is used for the UE to access the server. 8. The data transmission device according to claim 7, characterized in that, The first connection unit is specifically configured to establish a transmission control protocol TCP connection with the server according to the IP address of the server received by the receiving unit. 9. The data transmission device according to claim 7, characterized in that, The first connection unit is specifically configured to establish an MPTCP connection with the server according to the IP address of the server received by the receiving unit. 10. The data transmission device according to claim 7 or 9, characterized in that, The second connection unit is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address received by the receiving unit; the receiving unit, further configured to receive the second IP address sent by the UE through the first substream; The second connection unit is further configured to use the proxy IP address to establish the second subflow with the UE according to the second IP address received by the receiving unit. 11. The data transmission device according to claim 7 or 9, characterized in that, The second connection unit is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address received by the receiving unit; The data transmission device further includes a sending unit, configured to send the proxy IP address to the UE through the first subflow, so that the UE can use the second IP address to communicate with the UE according to the proxy IP address. The data transmission device establishes the second substream. 12. The data transmission device according to any one of claims 7-9, wherein, The second connection unit is further configured to delete one of the first substream and the second substream according to the service data volume of the UE. 13. A data transmission device, comprising a processor, a transceiver, a memory, and a bus, wherein the processor, the transceiver, and the memory are connected to each other through the bus; The transceiver is configured to receive an access request message sent by a user equipment UE; wherein, the UE supports dual-stack addresses, the IP address of the UE's Internet Protocol includes a first IP address and a second IP address, and the first IP address is An IP address and the second IP address are different types of IP addresses, the access request message includes the IP address of the server and the first IP address, and the first IP address and the IP address of the server are the same Type of IP address; the processor, configured to establish a first connection with the server according to the IP address of the server; The processor is further configured to establish a second connection with the UE according to the first IP address, where the second connection is an MPTCP connection, and the second connection includes a first subflow and a second subflow; The first sub-flow is a sub-flow established by the UE using the first IP address and the data transmission device using the IP address of the server, and the first sub-flow is used by the UE to send the The data transmission device sends the second IP address, or the data transmission device sends a proxy IP address to the UE, where the proxy IP address and the second IP address are IP addresses of the same type, and the second IP address is of the same type. The sub-flow is a sub-flow established by the UE using the second IP address and the data transmission device using the proxy IP address; The processor is further configured to establish an association between the first connection and the second connection, where the association is used for the UE to access the server. 14. The data transmission device of claim 13, The processor is specifically configured to establish a transmission control protocol TCP connection with the server according to the IP address of the server. 15. The data transmission device according to claim 13, wherein, The processor is specifically configured to establish an MPTCP connection with the server according to the IP address of the server. 16. The data transmission device according to claim 13 or 15, characterized in that, The processor is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address; the transceiver, further configured to receive the second IP address sent by the UE through the first substream; The processor is further configured to use the proxy IP address to establish the second subflow with the UE according to the second IP address. 17. The data transmission device according to claim 13 or 15, characterized in that, The processor is specifically configured to use the IP address of the server to establish the first subflow with the UE according to the first IP address; The transceiver is further configured to send the proxy IP address to the UE through the first subflow, so that the UE uses the second IP address to communicate with the data transmission device according to the proxy IP address. The second subflow is established. 18. The data transmission device according to any one of claims 13-15, characterized in that, The processor is further configured to delete one of the first substream and the second substream according to the amount of service data of the UE.

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