WO2017101043A1

WO2017101043A1 - Data transmission method and device

Info

Publication number: WO2017101043A1
Application number: PCT/CN2015/097596
Authority: WO
Inventors: 周军平; 夏林瑾
Original assignee: 华为技术有限公司
Priority date: 2015-12-16
Filing date: 2015-12-16
Publication date: 2017-06-22
Also published as: CN107211010A; CN107211010B

Abstract

The present invention relates to the field of communications. Provided in the embodiments of the present invention are a data transmission method and device, capable of using a dual stack address of a user equipment (UE) to access a server, and improving the efficiency of data transmission between the UE and the server. The specific solution is as follows: a multi-path transmission control protocol (MPTCP) agent receiving an access request message sent by the UE; IP addresses of the UE comprising a first IP address and a second IP address which are IP addresses of different types; establishing a first connection with the server; establishing a second connection with the UE, the second connection being an MPTCP connection and comprising a first subflow and a second subflow, wherein the first subflow and the second subflow are established by the UE using the first IP address and the second IP address with the MPTCP agent respectively; and associating the first connection with the second connection. The present invention is for use in data transmission.

Description

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 fourth edition of the Internet Protocol (English full name: Internet Protocol version 4, English abbreviation: IPv4) address resources increasingly tight, mobile communication networks continue to support the sixth edition of the network interconnection protocol (English full name: Internet Protocol version 6, English Abbreviation: IPv6) address transition. The third-generation partnership project (English name: 3rd Generation Partnership Project, English abbreviation: 3GPP) supports the allocation of dual-stack addresses to the user equipment (English name: User Equipment, English abbreviation: UE), that is, assigns an IPv4 address to the UE. / or an IPv6 address.

When both the UE and the server support the dual-stack address and the multi-path transmission control protocol (English name: Multi-Path Transmission Control Protocol, MPTP), the UE can obtain an IPv4 address and an IPv6 address during a service execution. Two sub-flows (English name: Subflow) are established with the server's IPv4 address and IPv6 address, and data is transmitted to the server through two sub-streams.

However, when the server does not support the dual stack address, 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 IPv4 addresses, 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 the dual stack address, thereby improving the data transmission rate between the UE and the server.

To achieve the above objectives, the present application adopts the following technical solutions:

The first aspect provides a data transmission method. 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 carries the first connection according to the access request message. One IP The address establishes a second connection with the UE, and associates the second connection with the first connection to complete packet forwarding between the UE and the server. The second connection is an MPTCP connection, including a first sub-flow established by the UE using the first IP address and the MPTCP proxy, and a second sub-flow established by the UE using the second IP address and the MPTCP proxy. The UE can access the server through the MPTCP proxy by using the dual stack address, 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 respectively included in the first connection and the second connection according to the service data amount of the UE, to adjust between the UE and the server. Data transfer rate.

In a second aspect, there is provided a data transmission device comprising a computer readable medium for storing program code of the solution of the present application, the program code comprising instructions for performing the data transmission method provided by the first aspect.

In a third aspect, there is provided another data transmission device, 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; The program code of the data transmission method provided by the aspect is stored in the memory and controlled by the processor for execution.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

1 is a schematic diagram of 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 according to an embodiment of the present invention;

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

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

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The embodiment of the present invention provides a data transmission method, which is applied to a multi-path transmission control protocol (English name: Multi-Path Transmission Control Protocol, English abbreviation: MPTCP) proxy. In combination with the application scenario shown in Figure 1, the user equipment (English name: User Equipment, English abbreviation: UE) passes the packet data network gateway (English name: packet data network gateway, English abbreviation: PGW) and multi-path transmission control protocol. Full name: Multi-Path Transmission Control Protocol, English abbreviation: MPTCP) proxy access server. After the UE accesses the mobile network, a connection is established with the PGW, and the PGW device may include an MPTCP proxy or both. When the PGW device includes an MPTCP proxy, the PGW may select to enable or disable the MPTCP proxy function according to the IP address type of the UE and the server. Specifically, if the IP address obtained by the UE from the PGW and the IP address of the server are the same type of IP address, for example, the same as the IPv4 address or the IPv6 address, the PGW does not need to enable the function of the MPTCP proxy. If the UE acquires two IP addresses from the PGW, including an IPv4 address and an IPv6 address, the PGW starts the function of the MPTCP proxy. When the PGW device and the MPTCP proxy are independent of each other, 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, an IPv4 address and an IPv6 address, are used as an example for description. Of course, this does not mean that the present invention is only applicable to the case of an IPv4 address and an IPv6 address.

Two different types of IP addresses obtained by the UE, including an IPv4 address and an IPv6 address, and use 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 MPTCP connection between the MPTCP proxy and the server, and the MPTCP connection between the MPTCP proxy and the UE is that the MPTCP proxy establishes an MPTCP connection with the UE, including the substream established by the IPv4 address (English name: Subflow), and A subflow established by an IPv6 address. The MPTCP connection established by the MPTCP proxy and the server includes only the substream established by one of the IPv4 address or the IPv6 address. For example, if the server only supports IPv4 addresses, then the MPTCP connection between the MPTCP proxy and the server includes only substreams established through IPv4 addresses.

In the embodiment of the present invention, two different types of IP addresses acquired by the UE are respectively described by the first IP address and the second IP address, and one of the first IP address and the second IP address is an IPv4 address, and the other is IPv6 address. The IP address of the server is an IPv4 address or an IPv6 address. In the embodiment of the present invention, a case where the first IP address and the IP address of the server are the IPv4 address and the second IP address is the IPv6 address will be described 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 the user equipment UE.

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

The PGW forwards the access request message to the MPTCP proxy, or only sends the server's IP address 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.

The MPTCP proxy establishes a connection with the server, including the following two cases.

In the first case, the server does not support MPTCP. At this time, the MPTCP proxy establishes a TCP connection with the server using the access IP address according to the IP address of the server. The access IP address and the server address are the same type of IP address, that is, an IPv4 address.

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 can also be other IPv4 addresses, for example, the access IP address is an IP address configured in advance for the MPTCP proxy.

In the second case, the server supports MPTCP. At this time, the MPTCP proxy establishes an MPTCP connection with the server according to the IP address of the server to improve the data throughput rate between the MPTCP proxy 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 a server-side IP address, wherein the IP address of the MPTCP proxy refers to the IP address used by the MPTCP proxy to establish a substream with the server. The IP address of the server is the IP address used by the server to establish a subflow with the MPTCP proxy. Since the server only supports one type of IP address, the IP address of the MPTCP proxy and the IP address of the server are the same type of IP address.

Optionally, the number of IP addresses of the server is 1, that is, the IP address of the server includes only 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 also include an IP address previously 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 IP address is accessed, and the IP address of the server is the same, which is the server included in the access request message. The IP address is indicated by IP address A in Table 1.

Table I

Optionally, if the number of the server's IP address is greater than 1, the MPTCP proxy establishes the first substream with the server by using the first IP address according to the IP address of the server included in the access request message, and the server passes the substream to the MPTCP proxy. Send another IP address. In this case, the MPTCP proxy and the server establish other substreams on the basis of the first subflow. In combination with Table 2, the IP addresses of different substreams may be different, and the IP addresses of the servers may be different.

Table II

Further, in an application scenario where the number of IP addresses of the server is greater than 1, and the access IP address is not configured for the MPTCP proxy, the IP address of the MPTCP proxy may include only the IP address of the first IP address, and the MPTCP proxy remains. Multiple sub-flows can be established with the server. The IP address of the different sub-flows is the IP address of the MPTCP proxy, and the IP address of the server is 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 a first substream and a second substream. Combined with Table 3, the process of establishing the first substream and the second substream with the MPTCP proxy and the UE is as follows:

Table 3

The UE supports a dual stack address, 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 can be an IPv4 address or an IPv6 address. The case where the IP address of the server is an IPv4 address is used as an example.

After receiving the access request message, the MPTCP proxy establishes the first substream with the UE using the IP address of the server according to the first IP address of the UE. As shown in Table 3, the IP address of the UE corresponding to the first substream is the first IP address, and the IP address of the MPTCP proxy is the IP address of the server.

After the first substream is established, the MPTCP proxy further establishes a second substream with the UE. As shown in Table 3, the IP address of the UE corresponding to the second substream is the second IP address, and the IP address of the MPTCP proxy is the proxy IP address. The proxy IP address is an IP address configured in advance for the MPTCP proxy, and the proxy IP address and the second IP address are the same type of IP address, that is, an IPv6 address.

The second substream can be established in two ways. The first method is that the MPTCP proxy sends a proxy IP address to the UE through the first substream, and the UE establishes a second substream with the MPTCP proxy according to the proxy IP address. Another way is that the UE sends a second IP address to the MPTCP proxy through the first substream, and the MPTCP proxy is based on the second IP address. The address establishes a second substream with the UE using the proxy IP address. The two methods are described as follows:

In the first mode, the UE sets the MP_CAPABLE identifier in the TCP packet sent to the MPTCP proxy through the first substream, and queries the MPTCP proxy to determine whether the second MPTCP substream can be established. After the MPTCP proxy returns the MP_CAPABLE ACK message to the UE, the proxy IP address is sent to the UE through the ADD_ADDR option.

After receiving the proxy IP address, the UE sends a TCP packet with the MP_JOIN flag set to the proxy IP address using the second IP address, requesting to establish a second substream. The MPTCP proxy returns an MP_JOIN ACK message to the UE, and the second stream is established.

In the second mode, 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 sends a TCP packet with the MP_JOIN flag set to the second IP address using the proxy IP address, requesting to establish a second substream. The UE returns an MP_JOIN ACK message to the MPTCP proxy, and the second stream is established.

204. Associate the first connection with the second connection.

The MPTCP proxy associates the first connection with the second connection for the UE's access to the server. After the first connection is associated with the second connection, the MPTCP proxy forwards the packet received from the UE through the first connection, forwards the packet to the server through the second connection, and passes the packet received from the server through the second connection through the first The connection is forwarded to the UE, ie the UE can access the server through the MPTCP proxy. In the prior art, if the server only supports IPv4 addresses, the UE can only access the server through the IPv4 address. If the server only supports the IPv6 address, 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 perform data transmission by using the first substream and the second substream. The server's dual stack address is used to access the server, which improves the data transmission rate between the UE and the server.

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

Step 205 is an optional step.

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

Specifically, if one of the first sub-flow and the second sub-flow is deleted, the service data volume is less than the first preset threshold, and the re-establishment has been deleted if the service data quantity exceeds the second preset threshold. Subflow. The second preset threshold is greater than or equal to the first preset threshold. It should be noted that deleting which of the two substreams is independent of the type of IP address supported by the server. For example, if the server only supports IPv4, the proxy server can delete the first substream (IPv4 substream), so that the MPTCP proxy and the UE are connected through the second substream (IPv6 substream), and the MPTCP proxy and the server use IPv4. The TCP or MPTCP connection established by the address pair. The MPTCP proxy adapts and forwards the IPv6 data packet of the UE and the IPv4 data packet of the server. After the first substream is deleted, the UE can still access the server through the MPTCP proxy.

Similarly, when the MPTCP proxy establishes an MPTCP connection with the server, the number of substreams can also be dynamically adjusted so that the first connection and the second connection have respective data transmission rates.

The data transmission method provided by the embodiment of the present invention, the MPTCP proxy 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, The packet forwarding between the UE and the server is completed. The second connection is an MPTCP connection, including a first sub-flow established by the UE using the first IP address and the MPTCP proxy, and a second sub-flow established by the UE using the second IP address and the MPTCP proxy. The UE can access the server through the MPTCP proxy by using the dual stack address, 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 for performing the functions performed by the MPTCP proxy in the foregoing embodiment. Referring to FIG. 3, the data transmission device 30 includes:

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

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, where the second connection is an MPTCP connection, and the second connection includes the first substream and the second substream. The first substream is a substream 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 substream 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 the same type of IP address, and the second substream is a substream 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 associate the access for the UE to 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 configured to establish, by using the IP address of the server, the first sub-flow with the UE according to the first IP address received by the receiving unit 301.

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

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

The data transmission device 30 further includes a transmitting unit 305 for transmitting a proxy IP address to the UE through the first substream, so that the UE establishes a second substream with the data transmission device 30 using the second IP address according to the proxy IP address.

Optionally, the second connecting unit 303 is further configured to delete one of the first substream and the second substream according to the service data amount 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 to complete the UE. Message forwarding between the server and the server. The second connection is an MPTCP connection, including a first sub-flow established by the UE using the first IP address and the MPTCP proxy, and a second sub-flow established by the UE using the second IP address and the MPTCP proxy. The UE can access the server through the data transmission device by using the dual stack address, 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 for performing the functions performed by the MPTCP proxy in the foregoing embodiment. Referring to FIG. 4, the data transmission device 40 includes a processor 401, a transceiver 402, a memory 403, and a bus 404. The processor 401, the transceiver 402, and the memory 403 are connected to one another via a bus 404.

Program code for carrying out the inventive arrangements is stored in memory 403 and controlled by processor 401 for execution.

The memory 403 may include a volatile memory 403 (English: volatile memory), such as random-access memory (abbreviation: RAM). The memory 403 may also include a 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). The memory 403 may also include a combination of the above types of memories.

The processor 401 may be a central processing unit (full name: Central Processing Unit, CPU for short), 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), programmable logic device (English: programmable logic device, abbreviation: PLD) or any combination thereof. The above PLD can be a complex programmable logic device (English: complex programmable logic device, abbreviation: CPLD), field-programmable gate array (English: field-programmable gate array, abbreviation: FPGA), general array logic (English: generic array Logic, abbreviation: GAL) or any combination thereof.

The processor 401 is configured to call the program code in the memory 403. In a possible implementation manner, when the 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 the dual stack address, and the IP address of the UE includes the first IP address and the 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 The IP address, the first IP address and the IP address of the server are the same type of IP address.

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, where the second connection is an MPTCP connection, and the second connection includes the first substream and the second substream. The first substream is a substream 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 substream 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 the same type of IP address, and the second substream is a substream 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 associate the first connection with the second connection, and associate the access for the UE to 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 server according to the first IP address. The IP address establishes a first substream with the UE.

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

The processor 401 is further configured to establish a second substream with the UE by using a proxy IP address according to the second IP address.

Optionally, the processor 401 is configured to establish, by using the IP address of the server, the first substream with the UE according to the first IP address.

The transceiver 402 is further configured to send a proxy IP address to the UE by using the first substream, so that the UE establishes the second substream with the data transmission device 40 by 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 amount of the UE.

The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

A data transmission method is applied to a multi-path transmission control protocol MPTCP proxy, which is characterized in that:

Receiving an access request message sent by the user equipment UE, where the UE supports a dual stack address, the network interconnection protocol IP address of the UE includes a first IP address and a second IP address, the first IP address and the first The second IP address is a different type of IP address, the access request message includes an 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 an IP address of the server;

Establishing a second connection with the UE according to the first IP address, the second connection is an MPTCP connection, and the second connection includes a first substream and a second substream; wherein the first substream Substream established by the UE using the first IP address and the MPTCP proxy using an IP address of the server, the first substream being used by 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 the same type of IP address, and the second substream uses the second An IP address and a substream established by the MPTCP proxy using the proxy IP address;

Associating the first connection with the second connection, the association being used by the UE to access the server.
The data transmission method according to claim 1, wherein the establishing a first connection with the server according to an IP address of the server comprises:

Establishing a Transmission Control Protocol TCP connection with the server according to the IP address of the server.
The data transmission method according to claim 1, wherein the establishing a first connection with the server according to an IP address of the server comprises:

Establishing an MPTCP connection with the server according to the IP address of the server.
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:

Establishing the UE with the IP address of the server according to the first IP address Establishing the first substream;

Receiving, by the first substream, the second IP address sent by the UE, and establishing, by using the proxy IP address, the second substream with the UE according to the second IP address.
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:

Establishing the first substream with the UE by using an IP address of the server according to the first IP address;

Transmitting, by the first sub-flow, the proxy IP address to the UE, so that the UE establishes the second sub-flow with the MPTCP proxy by using the second IP address according to the proxy IP address.
The data transmission method according to any one of claims 1 to 5, wherein the method further comprises:

Deleting one of the first substream and the second substream according to the amount of service data of the UE.
A data transmission device, comprising:

a receiving unit, configured to receive an access request message sent by the user equipment UE, where the UE supports a dual stack address, where the network interconnection protocol IP address of the UE includes a first IP address and a second IP address, the first IP The address and the second IP address are different types of IP addresses, and the access request message includes an IP address of the server and the first IP address, and the first IP address is the same type as the IP address of the server. 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 a stream and a second substream; wherein the first substream is a substream established by the UE using the first IP address and the data transmission device using an IP address of the server, the first substream Flowing for the UE to send the second IP address to the data transmission device, or the data transmission device sending a proxy to the UE An IP address, the proxy IP address being the same type of IP address as the second IP address, the second substream using the proxy IP by the UE using the second IP address and the data transmission device The substream of the address establishment;

a connection management unit, configured to associate the first connection with the second connection, where the association is used by the UE to access the server.
A data transmission device according to claim 7, wherein

The first connecting 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.
A data transmission device according to claim 7, wherein

The first connecting 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.
A data transmission device according to claim 7 or 9, wherein

The second connecting unit is configured to establish the first substream with the UE by using an IP address of the server according to the first IP address received by the receiving unit;

The receiving unit is further configured to receive, by using the first substream, the second IP address sent by the UE;

The second connecting unit is further configured to establish the second substream with the UE by using the proxy IP address according to the second IP address received by the receiving unit.
A data transmission device according to claim 7 or 9, wherein

The second connecting unit is configured to establish the first substream with the UE by using an IP address of the server 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 by using the first substream, so that the UE uses the second IP address according to the proxy IP address. The data transmission device establishes the second substream.
A data transmission device according to any one of claims 7 to 11, wherein

The second connecting unit is further configured to delete the service according to the service data amount of the UE. One of the first substream and the second substream.
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 the user equipment UE, where the UE supports a dual stack address, and the network interconnection protocol IP address of the UE includes a first IP address and a second IP address, where the An IP address and the second IP address are different types of IP addresses, the access request message includes an IP address of the server and the first IP address, and the first IP address is the same as an IP address of the server Type of IP address;

The processor is configured to establish a first connection with the server according to an 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 sub-flow and a second sub-flow; The first substream is a substream established by the UE using the first IP address and the data transmission device using an IP address of the server, where the first substream is used by the UE Transmitting, by the data transmission device, 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 the same type of IP address, the second a substream is a substream 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 associate the first connection with the second connection, where the association is used by the UE to access the server.
A data transmission device according to claim 13,

The processor is specifically configured to establish a transmission control protocol TCP connection with the server according to an IP address of the server.
A data transmission device according to claim 13, wherein

The processor is specifically configured to establish an MPTCP connection with the server according to an IP address of the server.
A data transmission device according to claim 13 or 15, wherein

The processor is specifically configured to establish the first substream with the UE by using an IP address of the server according to the first IP address;

The transceiver is further configured to receive, by using the first substream, the second IP address sent by the UE;

The processor is further configured to establish the second substream with the UE by using the proxy IP address according to the second IP address.
A data transmission device according to claim 13 or 15, wherein

The processor is specifically configured to establish the first substream with the UE by using an IP address of the server according to the first IP address;

The transceiver is further configured to send the proxy IP address to the UE by using the first substream, so that the UE uses the second IP address and the data transmission device according to the proxy IP address. The second substream is established.
A data transmission device according to any one of claims 13-17, characterized in that

The processor is further configured to delete one of the first substream and the second substream according to the service data amount of the UE.