Abstract: An ultrasonic transducer, a fingerprint recognition module, and an electronic device are provided, and belong to the field of ultrasonic detection technologies. The ultrasonic transducer includes a first electrode layer (01), a piezoelectric material layer (02), and a second electrode layer (03) that are sequentially stacked. The first electrode layer (01) includes a plurality of spaced first electrode blocks (011), the second electrode layer (03) includes a plurality of spaced second electrode blocks (031), and orthographic projection of each first electrode block (011) on the second electrode layer (03) overlaps at least one second electrode block (031). The first electrode layer (01) is disposed in a discretized manner, and a thickness of each first electrode block (011) is greater than a thickness threshold, so that a plurality of waveguide structures that can limit propagation paths of ultrasonic waves can be formed at the first electrode layer (01).

Abstract: This application relates to the field of communication technologies, and discloses a communication method and apparatus. The method includes: performing layering on first data, to obtain N layers of data, where N is an integer greater than or equal to 2; receiving modulation and coding indication information from a second communication apparatus, where the modulation and coding indication information indicates an MCS corresponding to each layer of data in P layers of data, the P layers of data belong to the N layers of data, and the MCS corresponding to each layer of data in the P layers of data; and separately performing coding and modulation on the P layers of data based on the MCS corresponding to each layer of data in the P layers of data.

Abstract: This application relates to the field of communication technologies, and provides a method and an apparatus for waking up a communication link. The method includes: a first device monitors a first part of wake-up information through a first link; when the first device receives the first part of the wake-up information and the first part includes an identifier of the first device or a group identifier of the first device, the first device monitors a second part of the wake-up information; and the first device wakes up a second link when the first device receives the second part, where power consumption of the second link is greater than power consumption of the first link. According to the method, power consumption of a wake-up link of a receive device can be reduced.

Abstract: This application provides a screenshot processing method and an electronic device. The method includes: after a screenshot operation is detected, obtaining position information of a screenshot box on a screenshot page and layout information of the screenshot page (S401), where the screenshot page includes one or more page elements, and the layout information of the screenshot page includes a level relationship and position information of the one or more page elements; determining one or more target page elements from the one or more page elements based on the position information of the screenshot box on the screenshot page and the layout information of the screenshot page (S402); and generating a first screenshot image based on the one or more target page elements (S403).

Abstract: An embodiment of this disclosure discloses a positioning method. The method includes: A satellite sends a first reference signal and a second reference signal to a terminal device, and a network device obtains a receiving time difference between the terminal device receiving the first reference signal and the second reference signal. The network device determines location information of the terminal device based on location information of the satellite when the satellite sends the first reference signal, location information of the satellite when the satellite sends the second reference signal, a sending time interval between the satellite sending the first reference signal and the second reference signal, and the receiving time difference between the first reference signal and the second reference signal.

Abstract: Embodiments of this application disclose a channel estimation method and apparatus. The method includes: receiving indication information for indicating M N-dimensional precoding vectors, wherein each precoding vector is applied to one of M frequency bands, wherein the M N-dimensional precoding vectors form a space-frequency matrix, wherein the space-frequency matrix is generated by performing a weighted combination on a plurality of space-frequency component matrices, wherein M?1, N?2, and both M and N are integers, wherein the space-frequency matrix is associated with one spatial stream of a plurality of spatial streams, and wherein quantities of frequency-domain component vectors associated with each of space-frequency matrices of different spatial streams of the plurality of spatial streams are the same; and determining the M N-dimensional precoding vectors based on the indication information.

Abstract: DoF of required channels of the matrix; calculating a difference between the DoF of the required channels and the DoF of the available channels, to obtain DoF of vacant channels; and symmetrically deducting several DoF of channels at two ends in a horizontal direction, to obtain a method for allocating the DoF of the available channels, in which there are more DoF in a middle column and there are fewer DoF in a side column.

Abstract: Embodiments of the present disclosure disclose a communication method, an apparatus, and a system. The communication method includes: receiving, by a terminal device, a context identifier sent by a second radio access network device, and sending, to a first radio access network device, a first message that includes the context identifier; receiving, by a core network device, a second message sent by the first radio access network device, and sending, to the second radio access network device, a message that includes the context identifier; and receiving, by the core network device, context information of the terminal device that is sent by the second radio access network device, and sending the context information to the first radio access network device. Therefore, communication between the first radio access network device and the second radio access network device is ensured, and working efficiency is improved.

Abstract: Embodiments of this application provide a multi-path configuration method, an apparatus, and a system, to provide a procedure in which remote user equipment (UE) establishes a plurality of paths by using a single path. The method includes: A first terminal device receives a first message from a network device through a first path, where the first message indicates the first terminal device to establish a second path between the first terminal device and the network device, and the second path is different from the first path; the first terminal device establishes the second path in a second cell by using the first message; and the first terminal device maintains a media access control (MAC) entity, where the MAC entity is used by the first terminal device to communicate with the network device through a direct path in the first path or the second path.

Abstract: This application discloses a beam measurement method and a related device. The method in this application includes: A first satellite base station obtains a measurement event, where the measurement event includes a target time period, the target time period is determined based on location information of a terminal, ephemeris information of a second satellite base station, and a beam scanning rule of the second satellite base station, and a target beam of the second satellite base station scans the terminal in the target time period. The first satellite base station sends the measurement event to the terminal, where the measurement event is used by the terminal for measuring the target beam in the target time period, and the first satellite base station is a serving satellite base station of the terminal.

Abstract: In a communication method, a first access point (AP) in a first AP multi-link device generates a management frame that includes a capability information field. The capability information field includes first indication information indicating whether a second AP, which is also in the first AP multi-link device, has performed a channel switch. The first AP then sends the management frame to a first station (STA).

Abstract: Embodiments of this application disclose a channel puncture mode indication method and a related apparatus, which are applied to a wireless local area network (WLAN) system, for example, a WLAN system supporting 802.11be. The method includes: An access point sends a multi-user request to send MU-RTS frame, where the MU-RTS frame includes a common information field, the common information field includes channel puncture information, and the channel puncture information indicates whether at least one 20 MHz channel is occupied.

Abstract: This application provides a configuration enabling method and an apparatus. The method includes: A first terminal device determines first indication information, where the first indication information indicates an enabling operation determined for a first sidelink, the enabling operation includes enabling a sidelink discontinuous reception SL DRX configuration for the first sidelink, or disabling an SL DRX configuration for the first sidelink, and the first sidelink is a sidelink between the first terminal device and a second terminal device. The first terminal device sends the first indication information to the second terminal device. According to the method provided in this application, the first terminal device introduces an SL DRX configuration enabling mechanism based on a status or a requirement of the second terminal device. This improves user experience.

Abstract: A beat frequency signal processing method includes determining a two-dimensional (2D) time frequency spectrogram of a beat frequency signal based on a sampled sequence of the beat frequency signal, where the 2D time frequency spectrogram indicates a relationship between a frequency and a time of the beat frequency signal; performing matching between the 2D time frequency spectrogram of the beat frequency signal and a plurality of theoretical 2D time frequency spectrograms to determine, as a target 2D time frequency spectrogram, a theoretical 2D time frequency spectrogram whose matching degree is greater than or equal to a preset threshold. The plurality of theoretical 2D time frequency spectrograms are 2D time frequency spectrograms of the beat frequency signal, under combinations of a plurality of flight times and a plurality of Doppler frequency offsets, that are calculated based on a frequency sweep curve of the frequency modulated signal.

Abstract: The present disclosure provides methods, systems and apparatus for efficient data management in distributed database system. According to an aspect, a method is provided. The method includes relocating a first table and a second table of a database to a first node of the database, wherein the first table and a second table (or one or more tables which have a colocation relationship with the first table) are associated with one or more distribution keys corresponding to one or more columns of the first table and the second table. The method further includes defining a colocation relationship between the first table and the second table based on a distribution key of the one or more distribution keys. The colocation relationship may indicate that data of the first table and the second table that correspond according to the distribution key are to reside on a same node of the database.

Abstract: Embodiments of this application disclose a communication processing method. The method includes: a baseband processing unit (BBU) receives an uplink measurement signal sent by a first terminal device. The BBU generates an air interface measurement report based on the uplink measurement signal, where the air interface measurement report includes an air interface channel quality value between the first terminal device and at least one pico remote radio unit (pRRU) in a cell in which the first terminal device is located. The BBU selects a target pRRU from the at least one pRRU based on the air interface measurement report, where a quantity of target pRRUs is less than a quantity of the at least one pRRU. The target pRRU is configured to send a downlink signal of the first terminal device to the first terminal device.

Abstract: A device may obtain an input symbol sequence for transmission. The device may further obtain a set of DPS sequences associated with Ni highest eigenvalues of a Slepian matrix and a set of extended sequences comprising the set of DPS sequences appended with extension symbols derived based on a convolution of respective DPS sequences. The device may modulate the set of extended sequences based on the input symbol sequence to generate a signal comprising Slepian-based waveform symbol(s). Another device may receive the signal, remove the extension symbols, and demodulate Slepian-based waveform symbol(s) of the signal based on the set of DPS sequences.

Abstract: In a thread management method, an application submits first information to an operating system through an API. The first information is used to indicate at least one first task to be executed by the application. The operating system allocates, by using the first information, the at least one first task to be executed by the application to a corresponding first task queue, and allocates a thread to the first task queue based on a current load level of the operating system and a type of the first task queue.

Abstract: An application start method includes obtaining a target application list when a size of free memory is greater than a preset threshold. The target application list is used to store one or more application identifiers of one or more applications whose memory is released. The application start method further includes starting, in the background, a process of an application identified in the target application list.