CN109618220B - Wireless screen projection method and wireless screen projection system - Google Patents

Wireless screen projection method and wireless screen projection system Download PDF

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Publication number
CN109618220B
CN109618220B CN201811587971.5A CN201811587971A CN109618220B CN 109618220 B CN109618220 B CN 109618220B CN 201811587971 A CN201811587971 A CN 201811587971A CN 109618220 B CN109618220 B CN 109618220B
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lifi
source device
receiving
direct connection
receiving device
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CN109618220A (en
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董传成
杨建军
樊杰
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Samsung Electronics China R&D Center
Samsung Electronics Co Ltd
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Samsung Electronics China R&D Center
Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363—Adapting the video stream to a specific local network, e.g. a Bluetooth® network
    • H04N21/43637—Adapting the video stream to a specific local network, e.g. a Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4367—Establishing a secure communication between the client and a peripheral device or smart card
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/647—Control signaling between network components and server or clients; Network processes for video distribution between server and clients, e.g. controlling the quality of the video stream, by dropping packets, protecting content from unauthorised alteration within the network, monitoring of network load, bridging between two different networks, e.g. between IP and wireless
    • H04N21/64784—Data processing by the network

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A wireless screen projection method and a wireless screen projection system are disclosed. The wireless screen projection method comprises the following steps: the method comprises the steps that a first wireless fidelity WiFi direct connection channel is established between a source device and a first receiving device; the method comprises the steps that a source device communicates with a first receiving device through a first WiFi direct connection channel to determine whether parameters supported by a visible light fidelity LiFi sending module of the source device are matched with parameters supported by a LiFi receiving module of the first receiving device; if the parameters supported by the LiFi sending module of the source device are matched with the parameters supported by the LiFi receiving module of the first receiving device, the source device communicates with the first receiving device through a first WiFi direct connection channel to establish a first LiFi direct connection channel with the first receiving device; the source device communicates with the first receiving device through the first WiFi direct connection channel so as to send content data played by the source device to the first receiving device through the first LiFi direct connection channel.

Description

Wireless screen projection method and wireless screen projection system
Technical Field
The present invention relates to a wireless screen projection method and a wireless screen projection system, and more particularly, to a wireless screen projection method and a wireless screen projection system capable of transmitting contents played in a source device through visible light fidelity.
Background
Current wireless screen projection technology generally establishes a wireless fidelity (WiFi) direct connection between devices equipped with WiFi modules supporting the Miracast standard directly without having the devices access any WiFi network and transmit/receive video and/or audio through the established WiFi direct connection. Such WiFi direct connection needs to support 802.11n protocol, the highest transmission rate supported by transmission based on such WiFi direct connection can reach 600Mbps, the highest resolution can reach 1920 × 1200, and the highest frame rate can reach 60fps, however, in practical application, due to the limitation of various factors, only the transmission rate of 300Mbps and the frame rate of 30bps can be generally achieved. In this case, the phenomena of pause, delay, and tearing of the picture often occur in the transmission of video and/or audio, and the large-resolution and large-data-volume screen projection cannot be supported. In addition, WiFi direct connections between devices are susceptible to WiFi hotspots around the devices, resulting in a high error rate during transmission. Moreover, the security of the WiFi direct connection is not sufficient, resulting in data transmitted through the WiFi direct connection being easily stolen.
Accordingly, video and/or audio transmitted via a WiFi direct connection can be transmitted through visible light, thereby greatly increasing a transmission rate, reducing delay, and supporting transmission of video and/or audio at a high resolution and a high frame rate. The screen projection with high definition of more than 4k resolution can be achieved through visible light transmission data, and three-dimensional screen projection with large data volume such as virtual reality/augmented reality can be supported. In addition, due to the limitation of channel capacity of WiFi direct connection, only one-to-one wireless screen projection is usually supported, and wireless screen projection from one device to multiple devices cannot be performed simultaneously, but characteristics such as visible light scattering and propagation can expand the number of devices receiving wireless screen projection data, so that wireless screen projection is no longer limited to one-to-one operation, and multiple receiving devices are supported to be connected with a source device, thereby realizing one-to-many wireless screen projection. In addition, data cannot be stolen at places where light cannot be received, so that the safety of indoor wireless screen projection data is enhanced on a physical layer.
Disclosure of Invention
The present invention has been made to solve at least the above disadvantages and to provide the advantages described below.
One aspect of the present invention is to provide a wireless screen projection method and a wireless screen projection system, which can improve the transmission bandwidth, transmission rate, and frame rate of a wireless screen projection and support high-definition screen projection with higher resolution.
Another aspect of the present invention is to provide a wireless screen projection method and a wireless screen projection system that may allow a source device to simultaneously perform wireless screen projection with a plurality of sink devices, and ensure wireless screen projection with each sink device with a high transmission bandwidth, a high transmission rate, a high frame rate, and a high resolution.
According to an aspect of the present invention, there is provided a wireless screen projection method, the method including: the method comprises the steps that a first wireless fidelity WiFi direct connection channel is established between a source device and a first receiving device; the method comprises the steps that a source device communicates with a first receiving device through a first WiFi direct connection channel to determine whether parameters supported by a visible light fidelity LiFi sending module of the source device are matched with parameters supported by a LiFi receiving module of the first receiving device; if the parameters supported by the LiFi sending module of the source device are matched with the parameters supported by the LiFi receiving module of the first receiving device, the source device communicates with the first receiving device through a first WiFi direct connection channel to establish a first LiFi direct connection channel with the first receiving device; the source device communicates with the first receiving device through the first WiFi direct connection channel so as to send content data played by the source device to the first receiving device through the first LiFi direct connection channel.
The step of the source device communicating with the first sink device through the first WiFi direct connection channel to determine whether the parameters supported by the LiFi sending module of the source device match the parameters supported by the LiFi sink module of the first sink device may include: the method comprises the steps that a source device sends inquiry information for inquiring parameters supported by a LiFi receiving module to a first receiving device through a first WiFi direct connection channel; the source device receiving parameter information on parameters supported by the LiFi receiving module from the first receiving device through the first WiFi direct channel, wherein the parameter information is transmitted by the first receiving device in response to the inquiry information; and the source device determines whether the parameters supported by the LiFi sending module are matched with the parameters supported by the LiFi receiving module according to the received parameter information.
The step of the source device communicating with the first sink device through the first WiFi direct channel to establish the first LiFi direct channel with the first sink device may include: the source device configures a LiFi sending module according to the matched parameters, and sends notification information for notifying the first receiving device of preparing to receive the information sent by the LiFi sending module to the first receiving device through the first WiFi direct connection channel; the source device receives response information to the notification information from a first receiving device through a first WiFi direct connection channel, wherein the first receiving device responds to the notification information and configures a LiFi receiving module according to matched parameters; the source device responds to the response information of the notification information, starts the LiFi sending module, and sends welcome information comprising the address information of the first receiving device once through the LiFi sending module at intervals of first preset time; the source device receives response information to the welcome information from a first receiving device through a first WiFi direct connection channel, wherein the response information to the welcome information is sent by the first receiving device in response to receiving the welcome information through a LiFi receiving module, verifies address information included in the welcome information, and sends the address information included in the welcome information under the condition that the address information included in the welcome information is address information of the first receiving device; and the source device responds to the response information of the welcome information, stops sending the welcome information and establishes a first LiFi direct connection channel.
And if the source device does not receive the response message to the welcome message within the second preset time, abandoning the establishment of the first LiFi direct channel.
The step of the source device communicating with the first receiving device through the first WiFi direct connection channel to control the source device to send the content data played by the source device to the first receiving device through the first LiFi direct connection channel may include: the source device and the first receiving device communicate through a first WiFi direct connection channel to agree on configuration information of content data to be sent through the first LiFi direct connection channel; the source device sends a screen projection starting signal to a first receiving device through a first WiFi direct connection channel; the source device receives response information of the screen projection starting signal from the first receiving device through the first WiFi direct connection channel; and the source device responds to response information of the screen projection starting signal, configures content data played by the source device based on the configuration information, and sends the configured content data to the first receiving device through the first LiFi direct connection channel.
The wireless screen projection method can also comprise: the source device transmits a control signal to a first receiving device or receives the control signal from the first receiving device through a first WiFi direct channel to control transmission of content data, wherein the control signal includes: a signal to pause playing the content data, a signal to resume playing the content data, or a signal to stop playing the content data.
The wireless screen projection method can also comprise: if the parameters supported by the LiFi sending module of the source device do not match the parameters supported by the LiFi receiving module of the first receiving device, the source device abandons the establishment of the first LiFi direct connection channel.
The wireless screen projection method can also comprise: and under the condition that the establishment of the first LiFi direct connection channel is abandoned, the source device sends content data played by the source device to the first device through the first WiFi direct connection channel.
The wireless screen projection method can also comprise: responding to the fact that the source device sends content data to a first receiving device sending source device through a first LiFi direct connection channel, and allowing the source device to establish a second WiFi direct connection channel with a second receiving device; the source device communicates with the second receiving device through the second WiFi direct connection channel to determine whether a LiFi receiving module of the second receiving device supports the matched parameters; if the LiFi receiving module of the second receiving device supports the matched parameters, the source device communicates with the second receiving device through a second WiFi direct connection channel to establish a second LiFi direct connection channel with the second receiving device, communicates with the second receiving device through the second WiFi direct connection channel to control the content data played by the source device to the second receiving device through the second LiFi direct connection channel, and if the LiFi receiving module of the second receiving device does not support the matched parameters, the source device disconnects the second WiFi direct connection channel with the second receiving device.
According to another aspect of the present invention, there is provided a wireless screen projection system, including: a source device; the first receiving device, wherein, the source device establishes a first wireless fidelity WiFi direct connection channel with the first receiving device, the source device communicates with the first receiving device through the first WiFi direct connection channel to determine whether parameters supported by a visible light fidelity LiFi sending module of the source device are matched with parameters supported by a LiFi receiving module of the first receiving device, if the parameters supported by the LiFi sending module of the source device are matched with parameters supported by a LiFi receiving module of the first receiving device, the source device communicates with the first receiving device through the first WiFi direct connection channel to establish the first LiFi direct connection channel with the first receiving device, and the source device communicates with the first receiving device through the first WiFi direct connection channel to control content data played to the first receiving device through the first LiFi direct connection channel.
The method comprises the steps that a source device sends inquiry information for inquiring parameters supported by a LiFi receiving module to a first receiving device through a first WiFi direct connection channel; the first receiving device responds to the inquiry information and sends parameter information about parameters supported by the LiFi receiving module to the source device through the first WiFi direct connection channel; and the source device determines whether the parameters supported by the LiFi sending module are matched with the parameters supported by the LiFi receiving module according to the received parameter information.
The source device configures a LiFi sending module according to the matched parameters, and sends notification information for notifying the first receiving device of preparing to receive the information sent by the LiFi sending module to the first receiving device through the first WiFi direct connection channel; responding to the notification information by the first receiving device, configuring a LiFi receiving module according to the matched parameters, and sending response information to the notification information to the source device through a first WiFi direct connection channel; the source device responds to the response information of the notification information, starts the LiFi sending module, and sends welcome information comprising the address information of the first receiving device once through the LiFi sending module at intervals of first preset time; the first receiving device responds to the fact that the welcome information is received through the LiFi receiving module, address information included in the welcome information is verified, and response information of the welcome information is sent to the first receiving device through the first WiFi direct connection channel under the condition that the address information included in the welcome information is the address information of the first receiving device; and the source device responds to the response information of the welcome information, stops sending the welcome information and establishes a first LiFi direct connection channel.
And if the source device does not receive the response message to the welcome message within the second preset time, abandoning the establishment of the first LiFi direct channel.
The source device and the first receiving device communicate through a first WiFi direct connection channel to agree on configuration information of content data to be sent through the first LiFi direct connection channel; the source device sends a screen projection starting signal to a first receiving device through a first WiFi direct connection channel; the first receiving device responds to the screen projection starting signal and sends response information of the screen projection starting signal to the source device through the first WiFi direct connection channel; and the source device responds to response information of the screen projection starting signal, configures content data played by the source device based on the configuration information, and sends the configured content data to the first receiving device through the first LiFi direct connection channel.
The source device transmits a control signal to a first receiving device or receives the control signal from the first receiving device through a first WiFi direct channel to control transmission of content data, wherein the control signal includes: a signal to pause playing the content data, a signal to resume playing the content data, or a signal to stop playing the content data.
If the parameters supported by the LiFi sending module of the source device do not match the parameters supported by the LiFi receiving module of the first receiving device, the source device abandons the establishment of the first LiFi direct connection channel.
And under the condition that the establishment of the first LiFi direct connection channel is abandoned, the source device sends content data played by the source device to the first device through the first WiFi direct connection channel.
Responding to content data sent by a source device to a first receiving device through a first LiFi direct connection channel, and allowing the source device to establish a second WiFi direct connection channel with a second receiving device; the source device communicates with the second receiving device through the second WiFi direct connection channel to determine whether a LiFi receiving module of the second receiving device supports the matched parameters; if the LiFi receiving module of the second receiving device supports the matched parameters, the source device communicates with the second receiving device through a second WiFi direct connection channel to establish the second LiFi direct connection channel with the second receiving device, communicates with the second receiving device through the second WiFi direct connection channel to send content data played by the source device to the second receiving device through the second LiFi direct connection channel, and if the LiFi receiving module of the second receiving device does not support the matched parameters, the source device disconnects the second WiFi direct connection channel with the second receiving device.
The invention can improve the transmission bandwidth, transmission rate and frame rate between the source device and the receiving device in the wireless screen projection system, support high-definition screen projection with higher resolution, allow the source device to simultaneously perform wireless screen projection with a plurality of receiving devices, and ensure that the wireless screen projection with each receiving device has high transmission bandwidth, high transmission rate, high frame rate and high resolution.
Drawings
The above and other objects and features of exemplary embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments, wherein:
fig. 1 is a block diagram of a wireless screen projection system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a wireless screen projection system according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of another wireless screen projection system according to an embodiment of the present disclosure;
fig. 4 is a flow chart of a wireless screen projection method according to an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
When a user performs wireless screen projection from a source device to a receiving device, due to the limitation of the transmission rate of the WiFi direct connection, real-time transmission of video and/or audio with high frame rate and high resolution cannot be generally achieved, so that when the user watches and/or listens to the video and/or audio received by the receiving device, a phenomenon of picture and/or sound jamming is easily caused. In addition, due to the limitation of the WiFi direct connection technology, only one-to-one wireless screen projection of the source device and the receiving device can be realized, which brings inconvenience to the user. In the present disclosure, a wireless screen projection method and a wireless screen projection system are provided for transmitting a control signal between a source device and a sink device through a bidirectional WiFi direct channel and transmitting video and/or audio data from the source device to the sink device through a unidirectional visible light fidelity (LiFi) direct channel.
Fig. 1 is a block diagram of a wireless screen projection system according to an embodiment of the present disclosure.
The wireless screen projection system as shown in fig. 1 includes a source device 100 and a first sink device 101.
When a user starts to execute a wireless screen projection function, a first wireless fidelity WiFi direct channel is established between the source device 100 and the first receiving device 101, the source device 100 communicates with the first receiving device 101 through the first WiFi direct channel to determine whether parameters supported by a visible light fidelity LiFi sending module of the source device 100 are matched with parameters supported by a LiFi receiving module of the first receiving device 101, if the parameters supported by the LiFi transmission module of the source device 100 match the parameters supported by the LiFi reception module of the first reception device 101, the source device 100 communicates with the first receiving device 101 through the first WiFi direct connection channel to establish a first LiFi direct connection channel with the first receiving device 101, and the source device 100 communicates with the first receiving device 101 through the first WiFi direct connection channel to control content data played by the source device 100 to the first receiving device 101 through the first LiFi direct connection channel.
According to an embodiment of the present disclosure, the source device 100 opens the WiFi direct discovery service to allow other devices to search for the source device 100, and the first receiving device 101 opens the WiFi direct discovery service to start a search. When the first sink device 101 searches for the source device 100, the source device 100 establishes a first WiFi direct channel with the first sink device 101, that is, a point-to-point WiFi direct connection is established between the source device 100 and the first sink device 101.
According to an embodiment of the present disclosure, after the source device 100 and the first receiving device 101 establish the first WiFi direct channel, the source device 100 and the first receiving device 101 may communicate through the first WiFi direct channel. The source device 100 transmits inquiry information for inquiring about parameters supported by the LiFi receiving module of the first receiving device 101 to the first receiving device 101 through the first WiFi direct channel. The first receiving device 101 transmits parameter information about parameters supported by the LiFi receiving module to the source device 100 through the first WiFi direct channel in response to receiving the inquiry information. The source device 100 receives the parameter information from the first receiving device 101 through the first WiFi direct channel, and determines whether the parameters supported by the LiFi sending module of the source device 100 are matched with the parameters supported by the LiFi receiving module of the first receiving device 101.
For example, the parameters supported by the LiFi transmitting module of the source device 100 and the parameters supported by the LiFi receiving module of the first receiving device 101 indicate parameters such as a carrier wavelength range, a modulation scheme, and a data encryption scheme. For example, the LiFi transmission module of the source device 100 and the LiFi reception module of the first reception device 101 can support a wavelength range of 400 to 760 nm. When the source device 100 receives the parameter information from the first receiving device 101 through the first WiFi direct connection channel, it may perform matching determination on parameters such as a carrier wavelength range, a modulation mode, a multiplexing frame structure, and a data encryption mode supported by the LiFi sending module of the source device 100 and corresponding parameters supported by the LiFi receiving module of the first receiving device 101.
According to an embodiment of the present disclosure, if it is determined that the parameters supported by the LiFi transmission module of the source device 100 match the parameters supported by the LiFi reception module of the first reception device 101, the source device 100 configures the LiFi transmission module according to the matched parameters. For example, the source device 100 configures the LiFi transmission module according to the matched carrier wavelength range, modulation scheme, data encryption scheme, and the like. After the configuration of the LiFi sending module is completed, the source device 100 sends notification information for notifying the first receiving device 101 that the first receiving device 101 is ready to receive information sent by the LiFi sending module to the first receiving device 101 through the first WiFi direct channel. The first receiving device 101 responds to the received notification information, configures a LiFi receiving module according to the parameter matching the LiFi receiving module with the LiFi sending module of the source device 100, and sends response information to the notification information to the source device 100 through the first WiFi direct connection channel. The source device 100 starts the LiFi transmission module in response to the response message to the notification message from the first sink device 101, and transmits welcome information including address information of the first sink device 101 through the LiFi transmission module once every first predetermined time. For example, the source device 100 transmits welcome information including address information of the first sink device 101 once every 50ms after the LiFi transmission module is started. The first receiving device 101 receives the welcome message through the LiFi receiving module, verifies address information in the received welcome message in response to the received welcome message, and sends response information to the welcome message to the source device 100 through the first WiFi direct channel if the address information included in the received welcome message is the address information of the first receiving device 101. The source device 100 stops sending the welcome information in response to receiving the response information to the welcome information, establishes a first LiFi direct connection channel with the first receiving device 101, and stores parameters, such as a carrier wavelength, a modulation mode, a data encryption mode and the like, of the LiFi sending module and the LiFi receiving module, which are matched with each other.
Further, if the source device 100 does not receive the reply message to the welcome message within the second predetermined time, the first LiFi direct channel is abandoned from being established with the first sink device 101. For example, if the source device 100 does not receive a response message to the welcome message within 2s after the start of transmitting the welcome message, the source device 100 abandons the establishment of the first LiFi direct channel. In this case, the source device 100 may transmit content data played by the source device to the first sink device 101 through the first WiFi direct channel.
According to an embodiment of the present disclosure, the source device 100 and the first sink device 101 communicate through the first WiFi direct channel to agree on configuration information of content data to be transmitted through the first LiFi direct channel. For example, the source device 100 may perform an RTSP protocol handshake with the first sink device 101 to agree on configuration information such as video resolution, frame rate, audio/video compression format, encryption scheme (e.g., WPA2), RTP transport protocol, and timestamp of audio/video to be transmitted through the LiFi.
After the configuration information is agreed, the source device 100 sends a screen projection start signal, for example, RTSP START message, to the first sink device 101 through the first WiFi direct channel. The first receiving device 101 responds to the received screen projection starting signal, sends response information of the screen projection starting signal to the source device 100 through the first WiFi direct access, the source device 100 receives the response information of the screen projection starting signal from the first receiving device 101 through the first WiFi direct access, responds to the response information of the screen projection starting signal, configures content data played by the source device 100 based on configuration information, and sends the configured content data through the first LiFi direct access.
For example, the source device 100 may compress, encrypt, pack, multiplex, and modulate a screen image captured in real time and an audio data stream input to a speaker based on the configuration information, and then transmit the processed content data to the first sink device 101 through the first LiFi direct channel. Upon receiving the content data, the first receiving apparatus 101 recovers an audio-visual data stream from the received content data, and performs playback rendering by a player.
According to an embodiment of the present disclosure, the source device 100 may further transmit a control signal to the first sink device 101 through the first WiFi direct channel to control transmission of the content data, where the control signal may include: a signal to pause playing of the content data, a signal to resume playing of the content data, a signal to stop playing of the content data, etc. For example, when a user performs a control operation at the source device 100, the source device 100 may transmit a control signal to the first sink device 101 through the first WiFi direct channel. For example, the source device 100 may transmit a PAUSE play signal (e.g., RTSP PAUSE) and PAUSE transmission and play of content data in response to the transmission of the PAUSE play signal, and the first sink device 101 PAUSEs reception and PAUSEs play of content data in response to the reception of the PAUSE play signal. For example, the source device 100 may transmit a RESUME play signal (e.g., RTSP RESUME) and retransmit and play the content data in response to the RESUME play signal, and the first sink device 101 RESUMEs receiving and playing the content data in response to receiving the RESUME play signal. For example, the source device 100 may transmit a STOP play signal (e.g., RTSP STOP), and STOP playing the content data in response to the transmission of the STOP signal, STOP transmitting the content data through the first LiFi direct channel, turn off the LiFi transmitting module, and disconnect the first LiFi direct channel and the first WiFi direct channel with the first sink device 101. The first receiving device 101 stops playing the content data in response to receiving the playing stop signal, stops receiving the data through the first LiFi direct connection channel, closes the LiFi receiving module, and disconnects the first LiFi direct connection channel and the first WiFi direct connection channel from the source device 100.
According to another embodiment of the present disclosure, the source device 100 may further receive a control signal from the first sink device 101 through the first WiFi direct channel to control the transmission of the content data, wherein the control signal may include: a signal to pause playing of the content data, a signal to resume playing of the content data, a signal to stop playing of the content data, etc. For example, when a user performs a control operation at the first receiving device 101, the first receiving device 101 may transmit a control signal to the source device 100 through the first WiFi direct channel, and the source device 100 may receive the control signal from the first receiving device 101 through the first WiFi direct channel. For example, the source device 100 may receive a PAUSE play signal (e.g., RTSP PAUSE) and PAUSE transmission and play of content data in response to receiving the PAUSE play signal, and transmit a response signal to the first sink device 101 through the first WiFi direct channel, and the first sink device 101 PAUSE reception and PAUSE play of content data in response to receiving the response signal. For example, the source device 100 may receive a RESUME play signal (e.g., RTSP RESUME) and retransmit and play the content data in response to the RESUME play signal, and transmit a response signal to the first receiving device 101 through the first WiFi-direct channel, and the first receiving device 101 RESUMEs receiving and playing the content data in response to receiving the response signal. For example, the source device 100 may receive a STOP play signal (e.g., RTSP STOP), and STOP playing the content data in response to transmitting the STOP signal, STOP transmitting the content data through the first LiFi direct channel, close the LiFi transmitting module, disconnect the first LiFi direct channel and the first WiFi direct channel with the first receiving device 101, and transmit a response signal to the first receiving device 101 through the first WiFi direct channel. The first receiving device 101 stops playing the content data in response to receiving the response signal, stops receiving the data through the first LiFi direct connection channel, closes the LiFi receiving module, and disconnects the first LiFi direct connection channel and the first WiFi direct connection channel with the source device.
According to an embodiment of the present disclosure, if it is determined that the parameters supported by the LiFi transmission module of the source device 100 do not match the parameters supported by the LiFi reception module of the first reception device 101, the source device 100 abandons the establishment of the LiFi direct channel with the first reception device 101, thereby transmitting the content data of the source device play 100 to the first device 101 through the first WiFi direct channel.
For example, fig. 2 shows a schematic diagram of a wireless screen projection system according to an embodiment of the present disclosure. As shown in fig. 2, the wireless screen projection system includes a source device and a first receiving device, wherein a solid line represents a first WiFi direct channel in a bidirectional direction between the source device and the first receiving device, and a dotted line represents a first LiFi direct channel in a unidirectional direction between the source device and the first receiving device.
Referring back to fig. 1, the wireless screen projection system may further include other receiving devices (not shown), for example, the wireless screen projection system may further include a second receiving device 102 (not shown). In such a wireless screen projection system, the source device 100 may establish a WiFi direct connection channel and a LiFi direct connection channel with other devices, in addition to establishing a first WiFi direct connection channel and a first LiFi direct connection channel with the first receiving device 101, so as to achieve wireless screen projection from the source device to a plurality of receiving devices at the same time. For example, the source device may establish a second WiFi direct channel and a second LiFi direct channel with the second sink device 102.
For example, in response to the source device 100 transmitting content data to the first sink device 101 over the first LiFi direct channel, the source device 100 allows a second WiFi direct channel to be established with the second sink device 102. After the source device 100 transmits content data to the first sink device 101 through the first LiFi command channel, the source device 100 turns on the WiFi direct discovery service again and allows the second sink device 102 equipped with the WiFi module supporting the Miracast standard to search for a discovery source device. When the second sink device 102 discovers the source device 100, the source device 100 establishes a second WiFi direct channel with the second sink device 102.
The source device 100 communicates with the second sink device 102 over the second WiFi direct channel to determine whether the LiFi sink module of the second sink device 102 supports the matched parameters. For example, the source device 100 queries the parameter information supported by the LiFi receiving module of the second receiving device 102 through the second WiFi direct channel, and determines whether the parameter information supported by the LiFi receiving module of the second receiving device 101 matches the parameter of the LiFi receiving module of the source device 100 and the LiFi receiving module of the first receiving device 101. If there is a match, the source device 100 determines that the second sink device 102 supports the matched parameters.
If the LiFi receiving module of the second receiving device 101 supports the matched parameter, the source device 100 communicates with the second receiving device 102 through the second WiFi direct connection channel to establish the second LiFi direct connection channel with the second receiving device 102, and communicates with the second receiving device 102 through the second WiFi direct connection channel to control the content data sent by the source device 100 to the second receiving device 102 through the second LiFi direct connection channel. The method of the source device 100 communicating with the second receiving device 102 through the second WiFi direct channel to establish the second LiFi direct channel with the second receiving device 102 is similar to the method of the source device 100 communicating with the first receiving device 101 through the first WiFi direct channel to establish the first LiFi direct channel with the first receiving device 101, and therefore, will not be described in detail. Similarly, the source device 100 may also perform wireless screen projection with other receiving devices (e.g., the third receiving device 103).
According to another embodiment of the present disclosure, in a case where a plurality of receiving devices perform wireless screen projection with the source device 100, for example, the first receiving device 101 and the second receiving device 102 perform wireless screen projection with the source device 100 at the same time, that is, in a case where the first receiving device 101 and the second receiving device 102 establish a first WiFi direct connection channel, a first LiFi direct connection channel, a second WiFi direct connection channel, and a second LiFi direct connection channel with the source device 100, respectively, when a user performs a control operation on the source device 100, the source device 100 may send a control signal to the first receiving device 101 and the second receiving device 102 through the first WiFi direct connection channel and the second WiFi direct connection channel, respectively. The first receiving means 101 and the second receiving means 102 operate in response to the received control signal. The control signal may include a pause play signal, a resume play signal, a stop play signal, etc. However, when a user performs a control operation at one of the plurality of receiving devices, for example, when the user performs a control operation at the first receiving device 101, the first receiving device 101 transmits a control signal to the source device 100 through the first WiFi direct channel, the source device 100 determines the number of receiving devices that perform wireless screen projection with itself in response to receiving the control signal, performs a control operation corresponding to the control signal if the number of receiving devices that perform wireless screen projection is 1, and ignores the control signal if the number of receiving devices that perform wireless screen projection is greater than 1. That is, when there are a plurality of sink devices that perform screen projection with the source device 100 and the user performs a control operation at one sink device among the plurality of sink devices, the source device 100 ignores the control request of the user.
For example, fig. 3 shows a schematic diagram of another wireless screen projection system according to an embodiment of the present disclosure. As shown in fig. 3, the wireless screen projection system may further include a second receiving device and a third receiving device in addition to the source device and the first receiving device, wherein a solid line represents a bidirectional WiFi direct channel between the source device and the receiving device, and a dotted line represents a unidirectional LiFi direct channel between the source device and the receiving device.
The wireless screen projection system realizes larger wireless screen projection transmission bandwidth from the source device to the receiving device, greatly improves the data transmission rate and the frame rate, supports high-definition screen projection with higher resolution and can support wireless screen projection from the source device to a plurality of receiving devices, and can ensure that the wireless screen projection with each receiving device can support high bandwidth, high data transmission rate, high frame rate and high resolution.
Fig. 4 is a flow chart of a wireless screen projection method according to an embodiment of the present disclosure.
In step 401, a source device establishes a first WiFi direct channel with a first sink device.
According to the embodiment of the disclosure, when a user starts to execute a wireless screen projection function, a source device serving as a wireless screen projection sender opens WiFi direct connection discovery service to allow other devices to search for the source device, and a first receiving device in the other devices serving as wireless screen projection receivers opens the WiFi direct connection discovery service to start searching. When the first receiving device searches for the source device, the source device establishes a first WiFi direct channel with the first receiving device, that is, a point-to-point WiFi direct connection is established between the source device and the first receiving device.
At step 402, the source device communicates with the first sink device via the first WiFi direct channel to determine whether a parameter supported by a LiFi sending module of the source device matches a parameter supported by a LiFi receiving module of the first sink device.
According to the embodiment of the disclosure, after the first WiFi direct connection channel is established between the source device and the first receiving device, the source device and the first receiving device can communicate through the first WiFi direct connection channel. The source device sends inquiry information for inquiring parameters supported by a LiFi receiving module of the first receiving device to the first receiving device through the first WiFi direct connection channel. The first receiving device transmits parameter information about parameters supported by the LiFi receiving module to the source device through the first WiFi direct channel in response to receiving the query information. The source device receives parameter information from the first receiving device through the first WiFi direct connection channel, and determines whether parameters supported by a LiFi sending module of the source device are matched with parameters supported by a LiFi receiving module of the first receiving device.
For example, the parameters supported by the LiFi sending module of the source device and the parameters supported by the LiFi receiving module of the first receiving device represent parameters such as a carrier wavelength range, a modulation method, and a data encryption method. For example, the LiFi transmission module of the source device and the LiFi reception module of the first reception device can support a wavelength range of 400-760 nm. When the source device receives the parameter information from the first receiving device through the first WiFi direct connection channel, the matching determination can be performed on the parameters such as the carrier wavelength range, the modulation mode, the multiplexing frame structure, the data encryption mode and the like supported by the LiFi sending module of the source device and the corresponding parameters supported by the LiFi receiving module of the first receiving device.
In step 403, if the parameters supported by the LiFi sending module of the source device are matched with the parameters supported by the LiFi receiving module of the first receiving device, the source device communicates with the first receiving device through the first WiFi direct connection channel to establish the first LiFi direct connection channel with the first receiving device.
According to an embodiment of the present disclosure, if it is determined at step 402 that the parameters supported by the LiFi transmission module of the source device match the parameters supported by the LiFi reception module of the first reception device, the source device configures the LiFi transmission module according to the matched parameters. For example, the source device configures the LiFi sending module according to the matched carrier wavelength range, modulation mode, data encryption mode, and the like. After the configuration of the LiFi sending module is completed, the source device sends notification information for notifying the first receiving device of preparing to receive information sent by the LiFi sending module to the first receiving device through the first WiFi direct connection channel. And the first receiving device responds to the received notification information, configures the LiFi receiving module according to the parameters matched with the LiFi receiving module of the source device and transmits response information to the notification information to the source device through the first WiFi direct connection channel. The source device starts the LiFi transmission module in response to the response message to the notification message from the first sink device, and transmits welcome information including address information of the first sink device through the LiFi transmission module once every first predetermined time. For example, the source device transmits welcome information including address information of the first sink device every 50ms after the LiFi transmission module is started. The first receiving device receives welcome information through the LiFi receiving module, responds to the received welcome information, verifies address information in the received welcome information, and sends response information to the welcome information to the source device through the first WiFi direct connection channel if the address information included in the received welcome information is the address information of the first receiving device. And the source device stops sending the welcome information in response to receiving response information to the welcome information, establishes a first LiFi direct connection channel with the first receiving device, and stores parameters matched with the LiFi sending module and the LiFi receiving module, such as carrier wave wavelength, modulation mode, data encryption mode and the like.
Further, if the source device does not receive a reply message to the welcome message within the second predetermined time, the establishment of the first LiFi direct channel with the first sink device is abandoned. For example, if the source device does not receive a response message to the welcome message within 2s after the start of transmitting the welcome message, the source device abandons the establishment of the first LiFi direct channel. In this case, the source device transmits the content data played by the source device to the first receiving device through the first WiFi direct channel.
At step 404, the source device communicates with the first sink device via the first WiFi direct channel to send content data played by the source device to the first sink device via the first LiFi direct channel.
According to an embodiment of the present disclosure, a source device and a first sink device communicate through a first WiFi direct channel to agree on configuration information of content data to be transmitted through a first LiFi direct channel. For example, the source device may perform an RTSP protocol handshake with the first receiving device to agree on configuration information such as video resolution, frame rate, audio/video compression format, encryption scheme (e.g., WPA2), RTP transport protocol, and timestamp of the audio/video to be transmitted over the LiFi.
After the appointment of the configuration information is completed, the source device sends a screen projection start signal, for example, RTSP START message, to the first receiving device through the first WiFi direct channel. The first receiving device responds to the received screen projection starting signal, response information of the screen projection starting signal is sent to the source device through first WiFi direct connection access, the source device receives the response information of the screen projection starting signal from the first receiving device through a first WiFi direct connection channel, responds to the response information of the screen projection starting signal, configures content data played by the source device based on configuration information, and sends the configured content data through a first LiFi direct connection channel.
For example, the source device may compress, encrypt, pack, multiplex, and modulate the screen image captured in real time and the audio data stream input to the speaker based on the configuration information, and then transmit the processed content data to the first sink device via the first LiF direct channel. After receiving the content data, the first receiving device recovers the audio-video data stream from the received content data, and plays and renders the audio-video data stream by the player.
According to an embodiment of the present disclosure, the source device may further transmit a control signal to the first receiving device through the first WiFi direct channel to control transmission of the content data, wherein the control signal may include: a signal to pause playing of the content data, a signal to resume playing of the content data, a signal to stop playing of the content data, etc. For example, when a user performs a control operation at the source device, the source device may transmit a control signal to the first receiving device through the first WiFi direct channel. For example, the source device may transmit a PAUSE play signal (e.g., RTSP PAUSE) and PAUSE transmission and play of the content data in response to the transmission of the PAUSE play signal, and the first sink device PAUSEs reception and PAUSEs play of the content data in response to the reception of the PAUSE play signal. For example, the source device may transmit a RESUME play signal (e.g., RTSP RESUME) and retransmit and play the content data in response to the RESUME play signal, and the first sink device RESUMEs receiving and playing the content data in response to receiving the RESUME play signal. For example, the source device may transmit a STOP play signal (e.g., RTSP STOP), and STOP playing the content data in response to transmitting the STOP signal, STOP transmitting the content data through the first LiFi direct channel, turn off the LiFi transmitting module, disconnect the first LiFi direct channel and the first WiFi direct channel with the first sink device. The first receiving device responds to the fact that the playing stopping signal is received to stop playing the content data, stops receiving the data through the first LiFi direct connection channel, closes the LiFi receiving module, and disconnects the first LiFi direct connection channel and the first WiFi direct connection channel of the source device.
According to another embodiment of the present disclosure, the source device may further receive a control signal from the first sink device through the first WiFi direct channel to control the transmission of the content data, wherein the control signal may include: a signal to pause playing of the content data, a signal to resume playing of the content data, a signal to stop playing of the content data, etc. For example, when a user performs a control operation at a first sink device, the first sink device may transmit a control signal to a source device through a first WiFi direct channel, and the source device may receive the control signal from the first sink device through the first WiFi direct channel. For example, the source device may receive a PAUSE play signal (e.g., RTSP PAUSE) and PAUSE transmission and play of the content data in response to receiving the PAUSE play signal, and transmit a response signal to the first sink device through the first WiFi-direct channel, and the first sink device PAUSE reception and PAUSE play of the content data in response to receiving the response signal. For example, the source device may receive a RESUME play signal (e.g., RTSP RESUME) and retransmit and play the content data in response to the RESUME play signal, and transmit a response signal to the first sink device through the first WiFi-direct channel, and the first sink device RESUMEs receiving and playing the content data in response to receiving the response signal. For example, the source device may receive a STOP play signal (e.g., RTSP STOP), and STOP playing the content data in response to transmitting the STOP signal, STOP transmitting the content data through the first LiFi direct-connection channel, close the LiFi transmitting module, disconnect the first LiFi direct-connection channel and the first WiFi direct-connection channel with the first receiving device, and transmit a response signal to the first receiving device through the first WiFi direct-connection channel. The first receiving device responds to the fact that the response signal is received to stop playing the content data, stops receiving the data through the first LiFi direct connection channel, closes the LiFi receiving module, and disconnects the first LiFi direct connection channel and the first WiFi direct connection channel of the source device.
In step 405, if it is determined in step 402 that the parameters supported by the LiFi sending module of the source device do not match the parameters supported by the LiFi receiving module of the first receiving device, the source device abandons the establishment of the first LiFi direct connection channel with the first receiving device, so as to send the content data played by the source device to the first device through the first WiFi direct connection channel.
According to another embodiment of the present disclosure, the source device may establish a WiFi direct connection channel and a LiFi direct connection channel with a plurality of other devices, in addition to establishing the first WiFi direct connection channel and the first LiFi direct connection channel with the first receiving device, thereby implementing wireless screen projection from the source device to the plurality of receiving devices at the same time.
According to another embodiment of the present disclosure, in response to a source device sending content data to a first sink device over a first LiFi direct channel, the source device allows a second WiFi direct channel to be established with a second sink device. For example, after the source device transmits content data to the first sink device through the first LiFi command channel, the source device turns on the WiFi direct discovery service again and allows the second sink device equipped with the WiFi module supporting the Miracast standard to search for a discovery source device. When the second receiving device discovers the source device, the source device establishes a second WiFi direct channel with the second receiving device.
The source device communicates with the second sink device through the second WiFi direct channel to determine whether the LiFi sink module of the second sink device supports the matched parameters. For example, the source device queries, through the second WiFi direct channel, parameter information supported by the LiFi receiving module of the second receiving device, and determines whether the parameter information supported by the LiFi receiving module of the second receiving device matches a parameter of the LiFi receiving modules of the source device and the first receiving device that match each other. If so, the source device determines that the second sink device supports the matched parameters.
If the LiFi receiving module of the second receiving device supports the matched parameters, the source device communicates with the second receiving device through the second WiFi direct connection channel to establish the second LiFi direct connection channel with the second receiving device, and communicates with the second receiving device through the second WiFi direct connection channel to control the content data played by the source device to the second receiving device through the second LiFi direct connection channel. The method for the source device to communicate with the second receiving device through the second WiFi direct connection channel to establish the second LiFi direct connection channel with the second receiving device is similar to the method for the source device to communicate with the first receiving device through the first WiFi direct connection channel to establish the first LiFi direct connection channel with the first receiving device, which is described above, and therefore, will not be described in detail.
According to another embodiment of the present disclosure, in a case where a plurality of receiving devices wirelessly project screens with a source device, for example, a first receiving device and a second receiving device wirelessly project screens with the source device at the same time, that is, in a case where the first receiving device and the second receiving device respectively establish a first WiFi direct connection channel, a first LiFi direct connection channel, a second WiFi direct connection channel, and a second LiFi direct connection channel with the source device, when a user performs a control operation at the source device, the source device may respectively send a control signal to the first receiving device and the second receiving device through the first WiFi direct connection channel and the second WiFi direct connection channel. The first receiving means and the second receiving means operate in response to the received control signal. The control signal may include a pause play signal, a resume play signal, a stop play signal, etc. However, when a user performs a control operation at one of the plurality of receiving devices, for example, when the user performs a control operation at the first receiving device, the first receiving device transmits a control signal to the source device through the first WiFi direct channel, the source device determines the number of receiving devices that perform wireless screen projection with itself in response to receiving the control signal, performs the control operation corresponding to the control signal if the number of receiving devices that perform wireless screen projection is 1, and ignores the control signal if the number of receiving devices that perform wireless screen projection is greater than 1. That is, when there are a plurality of sink devices that perform screen projection with the source device and the user performs a control operation at one sink device among the plurality of sink devices, the source device ignores the control request of the user.
The wireless screen projection method realizes larger wireless screen projection transmission bandwidth, greatly improves the data transmission rate and the frame rate, supports high-definition screen projection with higher resolution and can support wireless screen projection to a plurality of receiving devices at the same time.
Although a few exemplary embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims (16)

1. A wireless screen projection method comprises the following steps:
the method comprises the steps that a first wireless fidelity WiFi direct connection channel is established between a source device and a first receiving device;
the method comprises the steps that a source device communicates with a first receiving device through a first WiFi direct connection channel to determine whether parameters supported by a visible light fidelity LiFi sending module of the source device are matched with parameters supported by a LiFi receiving module of the first receiving device;
if the parameters supported by the LiFi sending module of the source device are matched with the parameters supported by the LiFi receiving module of the first receiving device, the source device communicates with the first receiving device through a first WiFi direct connection channel to establish a first LiFi direct connection channel with the first receiving device;
the source device communicates with the first receiving device through the first WiFi direct connection channel so as to send content data played by the source device to the first receiving device through the first LiFi direct connection channel;
the wireless screen projection method further comprises the following steps:
responding to content data played by a source device to a first receiving device through a first LiFi direct connection channel, and allowing the source device to establish a second WiFi direct connection channel with a second receiving device;
the source device communicates with the second receiving device through the second WiFi direct connection channel to determine whether a LiFi receiving module of the second receiving device supports the matched parameters;
if the LiFi receiving module of the second receiving device supports the matched parameters, the source device communicates with the second receiving device through the second WiFi direct connection channel to establish a second LiFi direct connection channel with the second receiving device, and communicates with the second receiving device through the second WiFi direct connection channel to control the content data played by the source device to the second receiving device through the second LiFi direct connection channel,
and if the LiFi receiving module of the second receiving device does not support the matched parameters, disconnecting the second WiFi direct connection channel with the second receiving device by the source device.
2. The wireless screen projection method of claim 1, wherein the step of the source device communicating with the first receiving device through the first WiFi direct channel to determine whether the parameters supported by the LiFi sending module of the source device match the parameters supported by the LiFi receiving module of the first receiving device comprises:
the method comprises the steps that a source device sends inquiry information for inquiring parameters supported by a LiFi receiving module to a first receiving device through a first WiFi direct connection channel;
the source device receiving parameter information on parameters supported by the LiFi receiving module from the first receiving device through the first WiFi direct channel, wherein the parameter information is transmitted by the first receiving device in response to the inquiry information;
and the source device determines whether the parameters supported by the LiFi sending module are matched with the parameters supported by the LiFi receiving module according to the received parameter information.
3. The wireless screen projection method of claim 1, wherein the step of the source device communicating with the first sink device over a first WiFi direct channel to establish a first LiFi direct channel with the first sink device comprises:
the source device configures a LiFi sending module according to the matched parameters, and sends notification information for notifying the first receiving device of preparing to receive the information sent by the LiFi sending module to the first receiving device through the first WiFi direct connection channel;
the source device receives response information to the notification information from a first receiving device through a first WiFi direct connection channel, wherein the first receiving device responds to the notification information and configures a LiFi receiving module according to matched parameters;
the source device responds to the response information of the notification information, starts the LiFi sending module, and sends welcome information comprising the address information of the first receiving device once through the LiFi sending module at intervals of first preset time;
the source device receives response information to the welcome information from a first receiving device through a first WiFi direct connection channel, wherein the response information to the welcome information is sent by the first receiving device in response to receiving the welcome information through a LiFi receiving module, verifies address information included in the welcome information, and sends the address information included in the welcome information under the condition that the address information included in the welcome information is address information of the first receiving device;
and the source device responds to the response information of the welcome information, stops sending the welcome information and establishes a first LiFi direct connection channel.
4. The wireless screen projection method of claim 3, wherein if the source device does not receive a reply message to the welcome message within a second predetermined time, the establishment of the first LiFi direct channel is abandoned.
5. The wireless screen projection method of claim 1, wherein the step of the source device communicating with the first sink device through the first WiFi direct channel to control the source device to transmit the content data played by the source device to the first sink device through the first LiFi direct channel comprises:
the source device and the first receiving device communicate through a first WiFi direct connection channel to agree on configuration information of content data to be sent through the first LiFi direct connection channel;
the source device sends a screen projection starting signal to a first receiving device through a first WiFi direct connection channel;
the source device receives response information of the screen projection starting signal from the first receiving device through the first WiFi direct connection channel;
and the source device responds to response information of the screen projection starting signal, configures content data played by the source device based on the configuration information, and sends the configured content data to the first receiving device through the first LiFi direct connection channel.
6. The wireless screen projection method of claim 1, further comprising: the source device transmits or receives a control signal to or from the first sink device through the first WiFi direct channel to control transmission of the content data,
wherein the control signal comprises: a signal to pause playing the content data, a signal to resume playing the content data, or a signal to stop playing the content data.
7. The wireless screen projection method of claim 1, further comprising: if the parameters supported by the LiFi sending module of the source device do not match the parameters supported by the LiFi receiving module of the first receiving device, the source device abandons the establishment of the first LiFi direct connection channel.
8. The wireless screen projection method of claim 4 or 7, further comprising: and under the condition that the establishment of the first LiFi direct connection channel is abandoned, the source device sends content data played by the source device to the first device through the first WiFi direct connection channel.
9. A wireless screen projection system, comprising:
a source device;
a first receiving device for receiving the first data,
wherein,
the source device establishes a first wireless fidelity WiFi direct channel with the first sink device,
the source device communicates with the first receiving device through the first WiFi direct channel to determine whether parameters supported by a visible light fidelity, LiFi, sending module of the source device match parameters supported by a LiFi receiving module of the first receiving device,
if the parameters supported by the LiFi sending module of the source device are matched with the parameters supported by the LiFi receiving module of the first receiving device, the source device communicates with the first receiving device through the first WiFi direct connection channel to establish a first LiFi direct connection channel with the first receiving device,
the source device communicates with the first receiving device through the first WiFi direct connection channel to control content data played by the source device to the first receiving device through the first LiFi direct connection channel;
wherein the source apparatus is further configured to:
responding to content data sent by a source device to a first receiving device through a first LiFi direct connection channel, and allowing the source device to establish a second WiFi direct connection channel with a second receiving device;
the source device communicates with the second receiving device through the second WiFi direct connection channel to determine whether a LiFi receiving module of the second receiving device supports the matched parameters;
if the LiFi receiving module of the second receiving device supports the matched parameters, the source device communicates with the second receiving device through the second WiFi direct connection channel to establish a second LiFi direct connection channel with the second electronic device, communicates with the second receiving device through the second WiFi direct connection channel to send content data played by the source device to the second receiving device through the second LiFi direct connection channel,
and if the LiFi receiving module of the second receiving device does not support the matched parameters, disconnecting the second WiFi direct connection channel with the second receiving device by the source device.
10. The wireless screen projection system of claim 9, wherein:
the method comprises the steps that a source device sends inquiry information for inquiring parameters supported by a LiFi receiving module to a first receiving device through a first WiFi direct connection channel;
the first receiving device responds to the inquiry information and sends parameter information about parameters supported by the LiFi receiving module to the source device through the first WiFi direct connection channel;
and the source device determines whether the parameters supported by the LiFi sending module are matched with the parameters supported by the LiFi receiving module according to the received parameter information.
11. The wireless screen projection system of claim 9, wherein:
the source device configures a LiFi sending module according to the matched parameters, and sends notification information for notifying the first receiving device of preparing to receive the information sent by the LiFi sending module to the first receiving device through the first WiFi direct connection channel;
responding to the notification information by the first receiving device, configuring a LiFi receiving module according to the matched parameters, and sending response information to the notification information to the source device through a first WiFi direct connection channel;
the source device responds to the response information of the notification information, starts the LiFi sending module, and sends welcome information comprising the address information of the first receiving device once through the LiFi sending module at intervals of first preset time;
the first receiving device responds to the fact that the welcome information is received through the LiFi receiving module, address information included in the welcome information is verified, and response information of the welcome information is sent to the first receiving device through the first WiFi direct connection channel under the condition that the address information included in the welcome information is the address information of the first receiving device;
and the source device responds to the response information of the welcome information, stops sending the welcome information and establishes a first LiFi direct connection channel.
12. The wireless screen projection system of claim 11, wherein if the source device does not receive a reply message to the welcome message within a second predetermined time, the establishment of the first LiFi direct channel is abandoned.
13. The wireless screen projection system of claim 9, wherein:
the source device and the first receiving device communicate through a first WiFi direct connection channel to agree on configuration information of content data to be sent through the first LiFi direct connection channel;
the source device sends a screen projection starting signal to a first receiving device through a first WiFi direct connection channel;
the first receiving device responds to the screen projection starting signal and sends response information of the screen projection starting signal to the source device through the first WiFi direct connection channel;
and the source device responds to response information of the screen projection starting signal, configures content data played by the source device based on the configuration information, and sends the configured content data to the first receiving device through the first LiFi direct connection channel.
14. The wireless screen projection system of claim 9, wherein the source device transmits or receives a control signal to or from the first sink device through the first WiFi direct channel to control transmission of the content data,
wherein the control signal comprises: a signal to pause playing the content data, a signal to resume playing the content data, or a signal to stop playing the content data.
15. The wireless screen projection system of claim 9, wherein: if the parameters supported by the LiFi sending module of the source device do not match the parameters supported by the LiFi receiving module of the first receiving device, the source device abandons the establishment of the first LiFi direct connection channel.
16. The wireless screen projection system of claim 12 or 15, wherein in case of abandoning establishment of the first LiFi direct channel, the source device sends content data played by the source device to the first device through the first WiFi direct channel.
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CN111836405B (en) * 2020-07-21 2022-11-29 深圳市炬力北方微电子有限公司 Wireless matching method and storage medium
CN111741353A (en) * 2020-07-22 2020-10-02 深圳Tcl新技术有限公司 Method for device cooperative work, terminal device and readable storage medium
CN116325764A (en) * 2020-10-16 2023-06-23 华为技术有限公司 Wireless screen projection method, device and system
CN112822530B (en) * 2020-12-29 2022-07-29 深圳Tcl新技术有限公司 Screen projection method, receiving terminal, source terminal and screen projection system
CN115550616A (en) * 2021-06-30 2022-12-30 华为技术有限公司 Wireless transmission system, method and device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014085124A1 (en) * 2012-11-27 2014-06-05 Motorola Solutions, Inc. Systems and methods for visible light communications personal area network and wireless local area network interworking
CN104281116A (en) * 2013-07-12 2015-01-14 深圳光启创新技术有限公司 Wireless control system
CN106330309A (en) * 2016-08-22 2017-01-11 中国科学技术大学 VLC-WiFi hybrid network user link access and switching method
CN107342815A (en) * 2017-08-21 2017-11-10 重庆思柏高科技有限公司 A kind of visible light communication device pairing system and method
CN107579775A (en) * 2017-08-24 2018-01-12 上海与德科技有限公司 A kind of data transmission method, device, mobile terminal and storage medium
EP3336709A1 (en) * 2016-12-16 2018-06-20 Orange Method for using an extended workstation, and associated system for using an extended workstation
CN207652440U (en) * 2017-12-11 2018-07-24 欧普照明股份有限公司 A kind of dual-mode communication system and lighting apparatus
CN108337557A (en) * 2018-02-11 2018-07-27 南昌大学 A kind of visible light multi-screen Display on the same screen device and method
CN108538227A (en) * 2018-04-28 2018-09-14 河南育光智能科技有限公司 A kind of show window optical projection system using visible light communication technology

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014085124A1 (en) * 2012-11-27 2014-06-05 Motorola Solutions, Inc. Systems and methods for visible light communications personal area network and wireless local area network interworking
CN104281116A (en) * 2013-07-12 2015-01-14 深圳光启创新技术有限公司 Wireless control system
CN106330309A (en) * 2016-08-22 2017-01-11 中国科学技术大学 VLC-WiFi hybrid network user link access and switching method
EP3336709A1 (en) * 2016-12-16 2018-06-20 Orange Method for using an extended workstation, and associated system for using an extended workstation
CN107342815A (en) * 2017-08-21 2017-11-10 重庆思柏高科技有限公司 A kind of visible light communication device pairing system and method
CN107579775A (en) * 2017-08-24 2018-01-12 上海与德科技有限公司 A kind of data transmission method, device, mobile terminal and storage medium
CN207652440U (en) * 2017-12-11 2018-07-24 欧普照明股份有限公司 A kind of dual-mode communication system and lighting apparatus
CN108337557A (en) * 2018-02-11 2018-07-27 南昌大学 A kind of visible light multi-screen Display on the same screen device and method
CN108538227A (en) * 2018-04-28 2018-09-14 河南育光智能科技有限公司 A kind of show window optical projection system using visible light communication technology

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
An Indoor Hybrid WiFi-VLC Internet Access System;Sihua Shao等;《2014 IEEE 11th International Conference on Mobile Ad Hoc and Sensor Systems》;IEEE;20150209;569-574 *
基于FPGA的高速可见光通信信号处理技术的研究与实现;霍庆源;《中国优秀硕士学位论文全文数据库 信息科技辑》;20180315(第3期);全文 *

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