Abstract: This application provides a security authentication method and apparatus applied to Wi-Fi, to help prevent a password from being shared among a plurality of devices, and implement management of a second device by a first device. In the method, an access point AP receives a first password input by the first device, where the first password is a password preset before delivery; and when checking the first password by the AP succeeds, the AP obtains a second password shared between the AP and the first device, and performs a 4-way handshake with the first device based on the second password. The second password is a shared key between the first device and the AP. Then, the AP can receive a first request from the first device, and send a third password to the first device in response to the first request.

Abstract: Embodiments of this application provide for a wireless projection method and apparatus. The embodiments relate to the communication field and reduce an occurrence of image tearing and freezing and image quality deterioration during wireless projection to improve a user's experience. The wireless projection method is applied to a Wi-Fi communication system. In the method, an electronic device transmits a scalable video coding slice of a first video frame to a display device in a first video transmission period. The method also includes obtaining channel state information that is fed back by the display device and that is used for transmitting the first video frame. The method also includes selectively enabling a retry mechanism based on the channel state information.

Abstract: This application discloses a multi-device connection establishment method and a device. The method includes: A first device sends a first message, where the first message is used to discover another device; the first device receives one or more second messages from one or more devices, where the second message is a response message for the first message; the first device determines, based on the one or more second messages, to establish a connection to a second device in the one or more devices; and the first device negotiates, with the second device, link information used to establish direct communication between the first device and the second device, and establishes a direct communication connection to the second device based on the link information. After a communication connection is established between devices based on discovery, link information is negotiated, and direct communication is established based on the link information, to form a system.

Abstract: Embodiments of the present disclosure relate to the field of communication technologies and disclose a wireless projection method, apparatus, and system. The method includes: A wireless projection apparatus determines, based on a display frame rate used when the wireless projection apparatus displays an image, a duration of a first transmission period. The wireless projection apparatus negotiates with a display apparatus to determine a configuration of a time domain resource in the first transmission period, where the time domain resource in the first transmission period is configured to include a first time segment, a second time segment, and a third time segment, the first time segment is used to send first data to the display apparatus, the second time segment is used to receive second data sent by the display apparatus, and the third time segment is used for sleep.

Abstract: Disclosed are a data transmission method, apparatus, and system. The data transmission method includes: sending a first multicast frame to a plurality of terminal devices; receiving multicast block acknowledgment frames respectively sent by the plurality of terminal devices, where the multicast block acknowledgment frame sent by the terminal device includes an acknowledgment field that indicates whether the terminal device receives at least one frame included in the first multicast frame; and when determining, based on the acknowledgment field included in the multicast block acknowledgment frame sent by any terminal device in the plurality of terminal devices, that the any terminal device does not receive a target frame in the first multicast frame, resending the target frame to the plurality of terminal devices. Thus, multicast frame transmission efficiency can be improved while ensuring multicast frame transmission reliability.

Abstract: An electronic apparatus, a control circuit, and a transmission control method includes a control circuit and at least two communication circuits, where the control circuit is configured to obtain first service data, and selectively distribute the first service data to at least one of the communication circuits, and any one of the communication circuits can support one wireless communication protocol.

Abstract: Embodiments of this application provide a WLAN communication apparatus and a control method. The method includes: adjusting power consumption of an external LNA based on a WLAN signal, to dynamically adjust the power consumption of the external LNA based on an actual requirement, so that the power consumption of the external LNA is reduced while a service requirement is ensured, and further, overall power consumption of a device is reduced.

Abstract: Embodiments of this application disclose a blocked antenna alarm method, and a communication chip and device that relate to the chip field. The embodiments resolve a problem where a communication device cannot prompt a user that an antenna of the communication device is blocked. In the method, the communication chip obtains an attenuation value of an air interface loopback signal through an antenna of the communication device. The communication chip then determines, based on the attenuation value, whether the antenna is blocked. When it is determined that the antenna is blocked, the communication chip indicates a processor of the communication device to output, to a user, alarm information indicating that the antenna is blocked.

Abstract: A service scheduling method and apparatus are provided, which relate to the field of communication technologies and are applied to a Wi-Fi network system, to resolve a problem that communication delays of a large amount of service data cannot be ensured when a communication channel in the Wi-Fi network system is limited. An example solution includes: a sending node obtains a waiting delay and a category of each data frame in a plurality of data frames at a current moment, determines a service priority of each data frame based on the category of each data frame, and determines, from the plurality of data frames, a target frame that is preferentially sent at the current moment based on the waiting delay, a preset delay, and the service priority of each data frame; and then the sending node sends the target frame to a receiving node at the current moment.

Abstract: Embodiments of this application provide a wireless projection method and apparatus, and relate to the communication field, to reduce image tearing and freezing and image quality deterioration occurring in wireless projection, and improve user experience. The wireless projection method is applied to a Wi-Fi communication system, and includes: An electronic device transmits a scalable video coding slice of a first video frame to a display device in a first video transmission period; obtains channel state information that is fed back by the display device and that is for transmitting the first video frame; and selectively enables a retry mechanism based on the channel state information.

Abstract: This application provides a security authentication method and apparatus applied to Wi-Fi. An access point AP negotiates, based on a password, a pairwise master key PMK with a first device based on a twin base password encrypted key exchange TBPEKE protocol, where the password is a shared key between the AP and the first device; and the AP performs a 4-way handshake with the first device based on the PMK. Therefore, in embodiments of this application, a PMK with a high entropy value can be generated by performing a TBPEKE procedure, so that the security authentication method provided in embodiments of this application can help resist an offline dictionary attack.

Abstract: This application provides a security authentication method and apparatus applied to Wi-Fi, to help prevent a password from being shared among a plurality of devices, and implement management of a second device by a first device. In the method, an access point AP receives a first password input by the first device, where the first password is a password preset before delivery; and when checking on the first password by the AP succeeds, the AP obtains a second password shared between the AP and the first device, and performs 4-way handshake with the first device based on the second password. The second password is a shared key between the first device and the AP. Then, the AP can receive a first request from the first device, and send a third password to the first device in response to the first request.

Abstract: Embodiments of this application relate to the field of communication technologies and disclose a wireless projection method, apparatus, and system. The method includes: A wireless projection apparatus determines, based on a display frame rate used when the wireless projection apparatus displays an image, duration of a first transmission period. The wireless projection apparatus negotiates with a display apparatus to determine a configuration of a time domain resource in the first transmission period, where the time domain resource in the first transmission period is configured to include a first time segment, a second time segment, and a third time segment, the first time segment is used to send first data to the display apparatus, the second time segment is used to receive second data sent by the display apparatus, and the third time segment is used for sleep.

Abstract: This application provides a wireless communication method and apparatus. The communication method includes: A sending device obtains a first matrix, where the first matrix is generated based on channel estimation of a communication channel between the sending device and a signal receiving device; the sending device generates an interference signal based on interference information and a second matrix, where the second matrix is an orthogonal matrix of the first matrix; and the sending device superimposes the interference signal and a to-be-sent signal, and sends a superimposed signal to the receiving device.

Abstract: A WI-FI communication method is applied to a communication system including a first device and a second device, and the first device communicates with the second device using at least two configurable channel links. The method includes sending, by the first device, link indication information to the second device, where the link indication information is used to indicate link attributes of the at least two channel links, receiving, by the first device, a first configuration indication fed back by the second device in response to the link indication information, and configuring, by the first device, transmission modes of non-control frames on the at least two channel links based on the first configuration indication.

Abstract: A cloud-based intelligence to emergency evacuation systems using Wi-Fi access points over data communication systems. A layout of emergency exits for a building being monitored and AP locations within the building layout is configured. A density map is generated from a number of stations within radio range of each AP including stations that are connected and stations that are not connected. An emergency that requires evacuation of people from the building from an emergency system associated with the building is detected. In response, an optimal evacuation route from each AP based on the density map and the building layout is generated. Evacuation instructions for each AP can be displayed on the stations within range of each AP.