Huawei

This application provides a WLAN system, used in the wireless communication field. The WLAN system includes an AC, a first AP, and a second AP. The AC is configured to: generate a first GTK, and send the first GTK to the first AP and the second AP. The first AP is associated with a first STA. The second AP is associated with a second STA. The first AP is configured to: encrypt data based on the first GTK, to obtain a first packet, and multicast or broadcast the first packet. The first AP is configured to send the first GTK to the first STA. The first GTK is used by the first STA to decrypt the first packet based on the first GTK. The second AP is configured to send the first GTK to the second STA. The first GTK is used by the second STA to decrypt the first packet based on the first GTK. In this application, a same GTK is used, and the first AP may multicast or broadcast the first packet for the first STA and the second STA, so that multicast or broadcast communication efficiency of the first AP is improved.

An intra prediction method and apparatus for reconstruction of unavailable reference samples are provided. The method includes obtaining an intra prediction mode of a current block, deriving availability of a reference sample of a component of the current block, substituting unavailable reference samples by using available reference samples, deriving a prediction of the current block based on the intra prediction mode and the substituted reference samples, and reconstructing the current block based on the prediction. The component includes a Cb component or a Cr component. Alternatively, the component includes a Chroma component. Since the method derives availability of the reference sample in each component, it can provide the available information more accurately.

Embodiments of this application provide a communication method. The method may include: receiving indication information, where the indication information indicates a first repetition segment duration, the first repetition segment duration is determined based on a first mapping relationship and a current beam elevation angle of a terminal device, and the first mapping relationship includes a correspondence between a beam elevation angle and repetition segment durations; and determining the first repetition segment duration based on the indication information and the first mapping relationship. According to the method, the repetition segment duration of a current information transmission is determined based on a beam elevation angle of the terminal device. This avoids out-of-synchronized communication due to an excessively large accumulated timing advance error caused by a communication device, so that communication efficiency is improved.

A multi-link reconfiguration method and apparatus relate to the field of communications technologies are provided to reconfigure a link between two MLDs. The method includes: A first MLD generates a first frame, where the first frame is used to reconfigure a link between the first MLD and a second MLD. The first MLD sends the first frame to the second MLD.

Embodiments of this application relate to a data communication method and an apparatus. In the method, a session management function sends a first message to an access management function based on context information of a multicast session corresponding to a multicast and broadcast service MBS. The first message is for triggering reporting of location information of a first terminal device. When the location information indicates a location of the first terminal device, and the session management function determines, based on the location of the first terminal device, that the first terminal device is located outside a service area of the MBS, or the location information indicates that the first terminal device is located outside a service area of the MBS, the session management function stops sending data to the first terminal device. According to this solution, the session management function can determine whether a terminal device can receive or should continue to receive data at a current location, and when the terminal device cannot receive or should not continue to receive the data, stop sending the data to the terminal device. This can reduce a waste of transmission resources, and improve a data sending success rate.

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Devices and methods of intra prediction of a block of a picture are provided. The method includes: obtaining information of Intra Sub-Partitions (ISP), where the information of ISP indicates whether ISP is used for splitting a current block; and selecting a set of coefficients of an interpolation filter based on the information of ISP, where the set of coefficients of the interpolation filter is fG coefficients or fC coefficients. The method further includes obtaining predicted samples of the current block by applying the set of coefficients to reference samples. When the information of ISP indicates whether ISP is used for splitting a current block (i.e., ISP is on), the method removes mode dependency during selection of interpolation filter type. This could increase encoding or decoding efficiency.

Embodiments of this application provide a callback stream processing method and a device, and relate to the field of electronic technologies. In a callback stream scenario, an electronic device may set a preview stream and a callback stream in parallel. After an application sets a callback function, the electronic device may directly return, by using the callback function, callback stream data to the application for processing. This can shorten a time consumed for creating a preview stream and a callback stream, shorten a time consumed for obtaining callback stream data, and shorten a user waiting time. A specific solution is as follows: After detecting a first operation that a user uses a first function of a first application, the electronic device starts a camera application; displays a first interface corresponding to the first function; creates a preview stream and a first callback stream in parallel; obtains first data, where the first data is callback stream data corresponding to the first callback stream; sets a callback function; and provides, by using the callback function, the first data for the first application for processing. The embodiments of this application are used to process a callback stream.

An encoding method and apparatus, a decoding method and apparatus, and a device are provided. The encoding method includes: obtaining K to-be-encoded bits (S301), where K is a positive integer; determining a first generator matrix, where the first generator matrix includes at least two sub-blocks distributed based on a preset position relationship, and the sub-block includes a plurality of first generator matrix cores (S302); generating a second generator matrix based on the first generator matrix, where the second generator matrix includes T sub-blocks, and a position relationship between two adjacent sub-blocks of the T sub-blocks is determined based on the preset position relationship (S303), where T is a positive integer; and polar encoding the K to-be-encoded bits based on the second generator matrix (S304), to obtain encoded bits. This can reduce encoding/decoding complexity.

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