WO2020063341A1

WO2020063341A1 - Video transmission method and device

Info

Publication number: WO2020063341A1
Application number: PCT/CN2019/105268
Authority: WO
Inventors: 刘安; 张利才; 申喻
Original assignee: 华为技术有限公司
Priority date: 2018-09-27
Filing date: 2019-09-11
Publication date: 2020-04-02
Also published as: CN110958068A; CN110958068B

Abstract

Provided is a video transmission method, wherein same is applied to a gateway device. The method comprises: receiving video data sent by a video server; forwarding the video data to a terminal device by means of a first WiFi channel; receiving a retransmission request from the terminal device by means of a second WiFi channel; and according to the retransmission request, sending, to the terminal device, video data to be requested for retransmission. In this way, it is ensured that video data transmission and a retransmission request do not to interfere with each other, thereby improving the transmission efficiency and video quality.

Description

Method and equipment for video transmission

This application claims the priority of a Chinese patent application filed on September 27, 2018 with the State Intellectual Property Office of China, with the application number 201811127648.X, and the invention name "A Method and Device for Video Transmission", the entire contents of which are incorporated by reference Incorporated in this application.

Technical field

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

Background technique

At present, there are mainly two types of video networks: IPTV (Internet TeleVision) network and OTT (Over The Top) video network. The IPTV network uses the usual multicast protocol, and the bandwidth load does not increase with the increase in the number of terminals, but requires high network quality. Once data loss occurs, data cannot be retransmitted. The OTT video network uses a unicast protocol. Although there is a retransmission protection function for data transmission, the bandwidth load will continue to increase with the increase in the number of terminals, which is prone to tidal effects and wastes bandwidth.

Currently, in the home network scenario, due to the constant popularity of WiFi (Wireless Fidelity), the continuous increase of WiFi terminals, various interferences continue to occur, causing the instability of the WiFi network, making IPTV's live broadcast service vulnerable to the environment in the home network environment. Affected by the loss of video data, and then cause video freeze, which affects the quality of video services.

Summary of the Invention

Embodiments of the present invention provide a method and a device for video transmission, which ensure that video data transmission and retransmission requests do not interfere with each other, and improve transmission efficiency and video quality.

In a first aspect, an embodiment of the present invention provides a method for video transmission, which is applied to a gateway device and includes: receiving video data sent by a video server; forwarding the received video data to a terminal device through a first WiFi channel; The WiFi channel receives a retransmission request from the terminal device; according to the retransmission request, sends video data to the terminal device that requests retransmission.

The above method ensures that video data transmission and retransmission requests do not interfere with each other, and improves video data transmission efficiency and video quality.

In a possible design, the gateway device receives the video data sent by the video server in a multicast manner and forwards it to the terminal device in a multicast manner. The multicast mode further improves the efficiency of video data transmission.

In another possible design, the first WiFi channel is a 5G-WiFi channel, and the second WiFi channel is a 2.4G-WiFi channel. WiFi channels with different frequencies further improve the efficiency of video data transmission.

In another possible design, the retransmission requested video data is sent to the terminal device through the first WiFi channel or the second WiFi channel. The gateway device sends the video data requesting retransmission to the terminal device through the first channel, that is, the 5G-WiFi high-speed channel, which avoids the switching of the receiving and sending of the WiFi channel, and further improves the video data transmission efficiency and video quality.

In another possible design, before receiving the video data, the method further includes: sending the service set identifier SSID and password of the second WiFi to the terminal device through the first WiFi channel, and establishing a connection with the SSID and password according to the SSID and password. The second WiFi channel of the terminal device. In this way, the gateway device can only present one WiFi to the outside, which improves user usability.

In a second aspect, an embodiment of the present invention provides a method for video transmission, which is applied to a terminal device, and includes: receiving video data sent by a gateway device through a first WiFi channel; determining that there is missing video data; The device sends a retransmission request; it receives video data from the gateway device that requests retransmission.

In a possible design, the terminal device receives the video data forwarded by the gateway device in a multicast manner.

In another possible design, the first WiFi channel is a 5G-WiFi channel, and the second WiFi channel is a 2.4G-WiFi channel.

In another possible design, the retransmitted video data returned by the gateway device is received through the first WiFi channel or the second WiFi channel.

In another possible design, before receiving the video data, the method further includes: the terminal device receives the service set identifier SSID and password of the second WiFi from the gateway device through the first WiFi channel, and according to the SSID and password Establish a second WiFi channel with the gateway device.

According to a third aspect, an embodiment of the present invention provides a gateway device having a function for realizing the behavior of the gateway device in the foregoing method. The functions may be implemented by hardware, and may also be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the foregoing functions, for example, including a receiving unit, a sending unit, and a retransmission unit.

In a possible design, the structure of the gateway device includes a processor and a memory, where the memory is configured to store program code for performing the foregoing method, and the processor is configured to execute a program stored in the memory. The gateway device may further include a communication interface for communicating with other devices. The communication interface includes two WiFi interfaces.

In a fourth aspect, an embodiment of the present invention provides a terminal device, which has a function of realizing the behavior of the terminal device in the foregoing method. The functions may be implemented by hardware, and may also be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the foregoing functions, for example, including a receiving unit and a retransmission unit.

In a possible design, the structure of the terminal device includes a processor and a memory, where the memory is configured to store program code for performing the foregoing method, and the processor is configured to execute a program stored in the memory. The terminal device may further include a communication interface for communicating with other devices. The communication interface includes two WiFi interfaces.

In a fifth aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the foregoing gateway device or terminal device, which includes a program designed to execute the foregoing aspect.

In the technical solution for video transmission provided in the embodiment of the present invention, video forwarding and video retransmission are performed through different WiFi channels, ensuring that video data transmission and retransmission requests do not interfere with each other, and improving video data transmission efficiency and video quality.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a system architecture for video transmission according to an embodiment of the present invention; FIG.

2 is a schematic flowchart of a video transmission according to an embodiment of the present invention;

3 is a schematic flowchart of another video transmission process according to an embodiment of the present invention;

4 is a schematic structural diagram of a gateway device according to an embodiment of the present invention;

FIG. 5 is another schematic structural diagram of a gateway device according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 7 is another schematic structural diagram of a terminal device according to an embodiment of the present invention.

detailed description

To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Before describing the embodiments of the present invention in detail, the application scenarios of the embodiments of the present invention will be described by examples.

The video transmission method provided in the embodiment of the present invention is applied to a video network system. FIG. 1 is a system architecture diagram of video transmission according to an embodiment of the present invention, including: a video server 101, a gateway device 102, and a terminal device 103. In a home network scenario, a gateway device can connect to multiple terminal devices and serve multiple terminal devices.

The video server 101 is connected to a gateway device through a network. It is used to provide video data to users. Video data can be delivered to the gateway device through unicast or multicast.

The gateway device 102 may be a home gateway device or a wireless access gateway device in a commercial place, and is configured to receive video data from a video server and forward the video data to a terminal device.

The gateway device includes two WiFi interfaces, which can establish two WiFi connections with the terminal device for video data transmission and data retransmission. The two WiFi interfaces may be WiFis with different signal frequencies, for example, a WiFi connection with a frequency of 5G and a WiFi connection with a frequency of 2.4G.

The terminal device 103 may be a mobile phone, a TV set-top box (STB), and the like, and is configured to receive video data and display it to a user for viewing.

The terminal device includes two WiFi interfaces, and can establish two WiFi connections with the gateway device for video data transmission and data retransmission.

Aiming at the half-duplex characteristic of the WiFi protocol itself, the embodiment of the present invention adopts a dual-channel method. Both the gateway device and the terminal device have two built-in WIFI chips, which can support 5G and 2.4G to work at the same time. The high-speed channel is sent to the terminal device, and the retransmission request can be sent to the gateway device through the low-speed channel of 2.4G-WiFi. This ensures that video data transmission and retransmission requests do not interfere with each other, improving transmission efficiency and video quality.

Applied to the system shown in FIG. 1 described above, an embodiment of the present invention provides a video transmission method. As shown in FIG. 2, the video transmission method specifically includes the following steps:

201. The gateway device receives video data sent by a video server.

For live video programs, multicasting can save network traffic.

202. The gateway device sends the received video data to the terminal device through the first WiFi channel.

As mentioned before, there are two WiFi channels between the gateway device and the terminal device. After receiving the live video data sent by the video server, the gateway device can send video data to the terminal device through the 5G-WiFi high-speed channel. For video data transmitted in multicast mode, the gateway device can also forward it to the terminal device in multicast mode.

203. The terminal device sends a retransmission request to the gateway device through the second WiFi channel.

During the process of the gateway device forwarding video data to the terminal device, due to various environmental factors, such as electromagnetic interference, obstacles, etc., the terminal device may experience signal loss and bit errors when receiving the video data, resulting in video data. Lost. Video data loss will cause mosaics, freezes, etc. in the video played by the video player. This affects video playback quality and user experience.

For the lost video data, the terminal device requests the gateway device to retransmit. The terminal device can send a retransmission request to the gateway device through the 2.4G-WiFi low-speed channel, requesting the gateway device to retransmit the video data lost by the terminal.

204. According to the retransmission request, the gateway device sends video data to the terminal device that is requested to be retransmitted.

When the gateway device receives the video data in step 201, it buffers the received video data, for example, it can buffer the video data for 10 seconds. In this way, after receiving the retransmission request from the terminal device, the gateway device looks up the requested data from the buffered video data and sends it to the terminal device. The gateway device may send video data requesting retransmission through the second WiFi channel, or may send video data requesting retransmission through the first WiFi channel.

Through the above method, it is ensured that video data transmission and retransmission requests do not interfere with each other, and transmission efficiency and video quality are improved. The gateway device sends the video data requesting retransmission to the terminal device through the first channel, that is, the 5G-WiFi high-speed channel, which avoids the switching of the receiving and sending of the WiFi channel, and further improves the video data transmission efficiency and video quality.

Applied to the gateway device shown in FIG. 1, the embodiment of the present invention provides another example of a method for video transmission. In this example, the 5G-WiFi high-speed channel is used for the gateway device to send video data to the terminal device, and the 2.4G-WiFi low-speed channel is used for the terminal device to send the retransmission request to the gateway device. The gateway device can only present one WiFi to the outside. For example, the 5G-WiFi service set identifier (SSID) and password can be presented to the outside, while the 2.4G-WiFi SSID and password can be configured on the gateway. 5G-WiFi is delivered to the terminal device. As shown in FIG. 3, the method specifically includes the following steps:

301. The gateway device establishes a 5G-WiFi data connection with the terminal device. 5G-WiFi provides a high-speed channel for transmitting video to terminal equipment.

302: The gateway device sends the 2.4G-WiFi SSID and password to the terminal device through the 5G-WiFi channel. The SSID and password of 2.4G-WiFi can be configured in the gateway device.

303. Using the received SSID and password, the terminal device establishes a 2.4G-WiFi data connection with the gateway device.

In this way, two WiFi channels are established between the gateway and the terminal, and video data can be sent and received and retransmitted through the two WiFi channels.

304. The gateway device receives the video data sent by the video server, and caches the video data.

For live video programs, multicasting can save network traffic.

305. The gateway device sends the received video data to the terminal device through the 5G-WiFi channel.

After receiving the live video data sent by the video server, the gateway device forwards the video data to the terminal device through the 5G-WiFi high-speed channel. For video data transmitted in multicast mode, the gateway device can also forward it to the terminal device in multicast mode.

306. The terminal device sends a retransmission request to the gateway device through the 2.4G-WiFi channel.

For the lost video data, the terminal device sends a retransmission request to the gateway device through the 2.4G-WiFi low-speed channel, requesting the gateway device to retransmit the lost video data of the terminal.

307. According to the retransmission request, the gateway device sends the requested video data to the terminal device through the 5G-WiFi channel.

After receiving the retransmission request from the terminal device, the gateway device looks up the requested data from the buffered video data and sends it to the terminal device.

The gateway device is sent to the terminal device through the 5G-WiFi high-speed channel, which avoids the switching of the receiving and sending of the WiFi channel. The two-way full-duplex communication is implemented between the gateway and the terminal, which further improves the video data transmission efficiency and video quality.

An embodiment of the present invention also provides a schematic structural diagram of a gateway device. As shown in FIG. 4, the gateway device includes a receiving unit 401, a sending unit 402, and a retransmission unit 403. Among them:

The receiving unit is configured to receive video data sent by the video server;

The sending unit is configured to forward the received video data to the terminal device through the first WiFi channel;

The retransmission unit is configured to receive a retransmission request of the terminal device through the second WiFi channel, and send the video data requesting retransmission to the terminal device according to the retransmission request.

Further, these units implement related functions in the foregoing method, and are not described again.

In this embodiment, the gateway device is presented in the form of a functional unit. The "unit" herein may refer to an application-specific integrated circuit (ASIC), a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other functions that may provide the above functions. Device. In a simple embodiment, those skilled in the art may think that the gateway device may be implemented by using a processor, a memory, and a communication interface.

The gateway device in the embodiment of the present invention may also be implemented in the manner of a computer device (or system) in FIG. 5. FIG. 5 is a schematic diagram of a computer device according to an embodiment of the present invention. The computer device includes at least one processor 501, a communication bus 502, a memory 503, and at least one communication interface 504, and may further include an IO interface 505.

The processor may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the solution of the present invention.

The communication bus may include a path to transfer information between the aforementioned components.

The communication interface uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), etc. In the present invention, the communication interface includes two WiFi communication modules.

The memory can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM), or other type of information that can store information and instructions Dynamic storage devices can also be electrically erasable and programmable read-only memory (Electrically Programmable Read-Only Memory (EEPROM)), compact discs (Compact Disc Read-Only Memory (CD-ROM)) or other optical disc storage, optical disc storage (CD-ROM) (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer Any other media, but not limited to this. The memory may exist independently and be connected to the processor through a bus. The memory can also be integrated with the processor.

The memory is used to store application program code that executes the solution of the present invention, and is controlled and executed by a processor. The processor is configured to execute application program code stored in the memory.

In a specific implementation, the processor may include one or more CPUs, and each CPU may be a single-core (single-core) processor or a multi-core (multi-core) processor. A processor herein may refer to one or more devices, circuits, and / or processing cores for processing data (such as computer program instructions).

In a specific implementation, as an embodiment, the computer device may further include an input / output (I / O) interface. For example, the output device may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. . The input device may be a mouse, a keyboard, a touch screen device, or a sensing device.

The above-mentioned computer equipment may be a general-purpose computer equipment or a special-purpose computer equipment. In a specific implementation, the computer device may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, an embedded device, or the like as shown in FIG. 5 Structure of equipment. The embodiment of the present invention does not limit the type of computer equipment.

The gateway device shown in FIG. 1 may be the device shown in FIG. 5, and one or more software modules are stored in the memory. The gateway device may implement a software module through a processor and program code in a memory to complete the foregoing method.

An embodiment of the present invention further provides a computer storage medium for storing computer software instructions used by the device shown in FIG. 4 or FIG. 5, which includes a program designed to execute the foregoing method embodiment. The above method can be implemented by executing a stored program.

An embodiment of the present invention also provides a schematic structural diagram of a terminal device, as shown in FIG. 6, including a receiving unit 601 and a retransmission unit 602. Among them:

A receiving unit, configured to receive video data sent by a gateway device through a first WiFi channel;

The retransmission unit is configured to determine that there is lost video data, send a retransmission request to the gateway device through the second WiFi channel, and receive the video data requesting retransmission returned by the gateway device.

In this embodiment, the terminal device is presented in the form of a functional unit. The "unit" herein may refer to an application-specific integrated circuit (ASIC), a circuit, a processor and a memory executing one or more software or firmware programs, an integrated logic circuit, and / or other functions that may provide the above functions Device. In a simple embodiment, those skilled in the art may think that the terminal device may be implemented by using a processor, a memory, and a communication interface.

The terminal device in the embodiment of the present invention may also be implemented in the manner of a computer device (or system) in FIG. 7. FIG. 7 is a schematic diagram of a computer device according to an embodiment of the present invention. The computer device includes at least one processor 701, a communication bus 702, a memory 703, and at least one communication interface 704, and may further include an IO interface 705.

The memory can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM), or other type of information that can store information and instructions Dynamic storage devices can also be electrically erasable programmable read-only memory (Electrically Programmable Read-Only Memory (EEPROM)), read-only compact discs (Compact Disc Read-Only Memory (CD-ROM)) or other compact disc storage, optical disc storage ( (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer Any other media, but not limited to this. The memory may exist independently and be connected to the processor through a bus. The memory can also be integrated with the processor.

The above-mentioned computer equipment may be a general-purpose computer equipment or a special-purpose computer equipment. In a specific implementation, the computer device may be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, an embedded device, or the like in FIG. Structure of equipment. The embodiment of the present invention does not limit the type of computer equipment.

The terminal device shown in FIG. 1 may be the device shown in FIG. 7, and one or more software modules are stored in the memory. The terminal device may implement a software module through a processor and program code in a memory to complete the foregoing method.

An embodiment of the present invention further provides a computer storage medium for storing computer software instructions used by the device shown in FIG. 6 or FIG. 7, which includes a program designed to execute the foregoing method embodiment. The above method can be implemented by executing a stored program.

Although the present invention is described in conjunction with the embodiments herein, in implementing the claimed invention, those skilled in the art can understand and understand by looking at the drawings, the disclosure, and the appended claims. Other variations of the disclosed embodiments are implemented. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude the case of a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. Certain measures are recited in mutually different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

Those skilled in the art should understand that the embodiments of the present invention may be provided as a method, an apparatus (device), or a computer program product. Therefore, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The computer program is stored / distributed in a suitable medium, provided with or as part of the hardware, or in other distributed forms, such as via the Internet or other wired or wireless telecommunications systems.

The present invention is described with reference to the flowcharts and / or block diagrams of the methods, devices (equipment) and computer program products of the embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, so that the instructions generated by the processor of the computer or other programmable data processing device are used to generate instructions Means for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a particular manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions The device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.

These computer program instructions can also be loaded on a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

Although the invention has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made thereto. Accordingly, the specification and drawings are merely exemplary illustrations of the invention as defined by the appended claims, and are deemed to have covered any and all modifications, changes, combinations, or equivalents that fall within the scope of the invention. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

A video transmission method applied to a gateway device is characterized in that it includes:

Receive video data sent by the video server;

Forwarding the received video data to a terminal device through a first WiFi channel;

Receiving a retransmission request of a terminal device through a second WiFi channel;

Sending the video data requesting retransmission to the terminal device according to the retransmission request.
The method according to claim 1, wherein the gateway device receives the video data sent by the video server in a multicast manner, and forwards the video data to the terminal device in a multicast manner.
The method according to claim 1 or 2, wherein the first WiFi channel is a 5G-WiFi channel, and the second WiFi channel is a 2.4G-WiFi channel.
The method according to any one of claims 1 to 3, wherein the video data requesting retransmission is sent to the terminal device through the first WiFi channel or the second WiFi channel.
The method according to any one of claims 1 to 4, wherein before receiving the video data, the method further comprises:

Send the service set identifier SSID and password of the second WiFi to the terminal device through the first WiFi channel, and establish a second WiFi channel with the terminal device according to the SSID and password.
A video transmission method, which is applied to a terminal device, is characterized in that it includes:

Receiving video data sent by a gateway device through a first WiFi channel;

Determine that there is missing video data;

Sending a retransmission request to the gateway device through the second WiFi channel;

Receiving video data from the gateway device requesting retransmission.
The method according to claim 6, wherein the terminal device receives the video data forwarded by the gateway device in a multicast manner.
The method according to claim 6 or 7, wherein the first WiFi channel is a 5G-WiFi channel, and the second WiFi channel is a 2.4G-WiFi channel.
The method according to any one of claims 6 to 8, wherein the retransmitted video data returned by a gateway device is received through the first WiFi channel or the second WiFi channel.
The method according to any one of claims 6 to 9, wherein before receiving the video data, the method further comprises:

The terminal device receives the service set identifier SSID and password of the second WiFi from the gateway device through the first WiFi channel, and establishes a second WiFi channel with the gateway device according to the SSID and password.
A gateway device, comprising:

A receiving unit, configured to receive video data sent by a video server;

A sending unit, configured to forward the received video data to a terminal device through a first WiFi channel;

A retransmission unit is configured to receive a retransmission request of a terminal device through a second WiFi channel, and send video data that is requested to be retransmitted to the terminal device according to the retransmission request.
The gateway device according to claim 11, wherein the receiving unit receives the video data sent by the video server in a multicast manner, and the sending unit forwards the data to the terminal device in a multicast manner.
The gateway device according to claim 11 or 12, wherein the first WiFi channel is a 5G-WiFi channel, and the second WiFi channel is a 2.4G-WiFi channel.
The gateway device according to any one of claims 11 to 13, wherein the retransmission unit sends the video data requesting retransmission to the terminal device through the first WiFi channel or the second WiFi channel. .
The gateway device according to any one of claims 11 to 14, wherein the sending unit is further configured to send the service set identifier SSID and password of the second WiFi to the terminal device through the first WiFi channel, and according to the The SSID and password establish a second WiFi channel with the terminal device.
A terminal device, comprising:

A receiving unit, configured to receive video data sent by a gateway device through a first WiFi channel;

The retransmission unit is configured to determine that there is lost video data, send a retransmission request to the gateway device through the second WiFi channel, and receive the video data requesting retransmission returned by the gateway device.
The terminal device according to claim 16, wherein the receiving unit receives the video data forwarded by the gateway device in a multicast manner.
The terminal device according to claim 16 or 17, wherein the first WiFi channel is a 5G-WiFi channel, and the second WiFi channel is a 2.4G-WiFi channel.
The terminal device according to any one of claims 16 to 18, wherein the video retransmission unit receives the video data requesting retransmission returned by the gateway device through the first WiFi channel or the second WiFi channel. .
The terminal device according to any one of claims 16 to 19, wherein the receiving unit is further configured to receive the service set identifier SSID and password of the second WiFi from the gateway device through the first WiFi channel, and according to the SSID And password to establish a second WiFi channel with the gateway device.