Abstract: The disclosure provides a bicycle front derailleur including a fixed component, a chain guide, a first link, a second link, and a driving assembly. Two opposite ends of the first link are respectively disposed on the fixed component and the chain guide. The two opposite ends of the second link are respectively disposed on the fixed component and the chain guide. The driving assembly includes a driving shaft, a push component, an output gear and a power source. The push component and the output gear are fixed on the driving shaft, the power source is disposed on the fixed component and connected to the output gear, the push component is in contact with the first link, and the power source is configured to drive the push component to pivot the first link with respect to the fixed component via the output gear and the driving shaft.

Abstract: Described herein is a mechanism for visual recognition of items or visual search using Optical Character Recognition (OCR) of text in images. Recognized OCR blocks in an image comprise position information and recognized text. The embodiments utilize a location-aware feature vector created using the position and recognized information in each recognized block. The location-aware features of the feature vector utilize position information associated with the block to calculate a weight for the block. The recognized text is used to construct a tri-character gram frequency, inverse document frequency (TGF-IDP) metric using tri-character grams extracted from the recognized text. Features in location-aware feature vector for the block are computed by multiplying the weight and the corresponding TGF-IDF metric. The location-aware feature vector for the image is the sum of the location-aware feature vectors for the individual blocks.

Abstract: A multi-antenna data transmission method, network device, terminal device, and system is suggested to effectively increase a system throughput. The method includes: sending, by a network device, downlink control signaling to a terminal device, where the downlink control signaling instructs the terminal device to feed back statistical channel parameter information, the statistical channel parameter information is determined by the terminal device according to statistical channel information, and the statistical channel information is obtained after the terminal device measures instantaneous channels many times; receiving, by the network device, the statistical channel parameter information that is determined according to the downlink control signaling and that is sent by the terminal device; and processing, by the network device, downlink data according to the statistical channel parameter information, and sending processed downlink data to the terminal device.

Abstract: The present disclosure provides a camera module and an electrical bracket thereof. The electrical bracket is provided with a clear aperture. The electrical bracket not only has the functions of a conventional circuit board (conduction of the electrical signal of an electronic device such as a chip and a motor), but also has the effects of a conventional base to support an optical filter and serve as a motor base bracket.

Abstract: Embodiments of the present invention provide user equipment, including: a transceiver module, configured to receive configuration information, where the configuration information is used to configure at least one physical resource block (PRB) bundling size; and a processing module, configured to determine a precoding resource block group (PRG) size based on the at least one PRB bundling size. The embodiments of the present invention further provide an access device. In technical solutions provided in the embodiments of the present invention, the PRG size is configured by configuring the PRB bundling size. In this way, there is no need to set dedicated signaling for configuring the PRG size. This helps reduce signaling overheads caused by configuring the PRG size.

Abstract: Embodiments of the present invention provide a channel measurement method. The method includes: obtaining, for a to-be-measured frequency band including at least one reporting subband and at least one missing subband, channel state information of each reporting subband and channel state information of each missing subband, where the channel state information of each reporting subband is obtained based on channel estimation, and the channel state information of each missing subband is obtained according to a reference rule with reference to channel state information of a reporting subband that is indicated by the reference rule and that is in the at least one reporting subband; and sending a measurement report of the to-be-measured frequency band to a transmit end device, where the measurement report includes the channel state information of each reporting subband in the at least one reporting subband.

Abstract: This disclosure includes a transmission scheme indication method, and a data transmission method, apparatus, and system, pertaining to the field of communications technologies. The transmission scheme indication method includes: generating transmission scheme indication information, where the transmission scheme indication information is used to indicate one of at least two transmission schemes included in a current transmission mode, and the at least two transmission schemes include a beamforming transmit diversity transmission scheme; and sending the transmission scheme indication information. This application resolves a problem of relatively low flexibility in UE data transmission, and improves flexibility in UE data transmission. This application is used for data transmission.

Abstract: A method for feeding back information about a channel between antenna arrays is provided, which includes: receiving, by a first network device, sub-channel channel information of N×M sub-channels that is sent by a second network device, where an antenna array of the first network device includes M panels, an antenna array of the second network device includes N panels, the channel between the first network device and the second network device includes the N×M sub-channels, M is a positive integer that is greater than or equal to 2, N is and N is a positive integer, M and N are not to be 1 at the same time, and the M panels and the N panels each includes at least two antennas; generating channel information of the channel between the first network device and the second network device according to the sub-channel channel information of the N×M sub-channels.

Abstract: A method of processing signals in a radio processing apparatus of a base station may include obtaining a plurality of aggregated data symbols, wherein each of the plurality of aggregated data symbols corresponds to a receive terminal of a plurality of receive terminals of the base station and is composed of transmitted data symbols from a plurality of transmit terminals; applying a compression filter to the plurality of aggregated data symbols to reduce the plurality of aggregated data symbols into a plurality of isolated data symbols, the compression filter being based on channel estimates between the plurality of receive terminals and the plurality of transmit terminals; and transmitting the plurality of isolated data symbols to a baseband processing apparatus of the base station.

Abstract: This application provides a communication method, a communications apparatus, and a system. The method may include receiving, by a terminal device, a first group of precoded reference signals and a second group of precoded reference signals. The method may also include feeding back first indication information based on a channel state information (CSI) feedback-based transmission scheme, where the first indication information is used to determine a plurality of precoding vectors, at least one of the plurality of precoding vectors is determined by using the first group of precoded reference signals, and at least one of the plurality of precoding vectors is determined by using the second group of precoded reference signals.

Abstract: A data transmission method between a plurality of transmit end devices and a receive end device includes receiving at least one piece of transmission control information. The at least one piece of transmission control information includes transmission control information received by the receive end device from at least one of the plurality of transmit end devices, and transmission control information from each of the plurality of transmit end devices includes a retransmission process identifier. The transmission control information controls data transmission between transmit and receive end devices. The method also includes for each of the at least one piece of transmission control information, determining the transmit end device configured to send the piece of transmission control information, and performing a retransmission control operation on the data transmission received by the receive end device.

Abstract: An indication method and apparatus, and an information determining method and apparatus are disclosed. Embodiments relate to the field of communications technologies. An indication method may include: generating indication information, where the indication information is used to indicate a transmit beam set, and a transmit beam in the transmit beam set is used to carry a same piece of DCI; and sending the indication information. The technical solutions may be applied to a scenario in which one or more network devices send DCI to a terminal and the DCI is carried on at least one beam for transmission.

Abstract: The disclosure provides a bicycle front derailleur including a fixing component, a chain guiding component, a linkage assembly, a battery assembly, two terminals, a circuit board assembly and a driving module. Two opposite ends of the linkage assembly are respectively and pivotally disposed on the fixing component and the chain guiding component. The battery assembly includes a battery holder and a battery. The battery holder is disposed on the fixing component, and the battery holder has a battery slot. One terminal is disposed in the battery slot, and the battery is removably inserted into the battery slot and is electrically connected to the terminal. The circuit board assembly is disposed on the fixing component and electrically connected to the other terminal. The terminals are electrically connected to each other. The driving module is disposed on the fixing component and electrically connected to the circuit board assembly.

Abstract: This application provides a data transmission method and apparatus, and a system.

Abstract: This application provides a reference signal sending method, a reference signal receiving method, a network device, and a terminal device, to perform CSI (Channel State Information) measurement by using more precoding vectors (or precoding matrices), to measure more equivalent channels, thereby improving flexibility and a spatial degree of freedom of network device scheduling. The method includes: performing, by the network device, precoder cycling on a first reference signal by using at least two precoding vectors, to obtain a precoded first reference signal, where the precoded first reference signal is borne in a plurality of physical resource groups, and signals borne in any two adjacent physical resource groups correspond to different precoding vectors; and sending, by the network device, the precoded first reference signal to the terminal device by using the plurality of physical resource groups, where the first reference signal is used by the terminal device to perform CSI measurement.

Abstract: This application provides a data transmission method, so that data transmission reliability can be improved. The method includes: receiving, by the terminal device, a plurality of reference signals used for channel measurement; and sending, by the terminal device, a plurality of pieces of first indication information based on the at least one reference signal and a transmission scheme on which CSI feedback is based, where the plurality of pieces of first indication information are used to indicate x target precoding matrices, at least one of the plurality of pieces of first indication information is used to indicate one target precoding matrix, and the x target precoding matrices are determined based on the plurality of precoding matrices, where x is a quantity of target precoding matrices that need to be fed back, and x is an integer greater than 1.

Abstract: Embodiments of this application disclose a rank indication reporting method and apparatus, and an indication method and apparatus, and relate to the field of communications technologies. The method may include: receiving at least two pieces of indication information, where each of the at least two pieces of indication information is used to indicate a maximum value of an RI that a network device associated with the indication information allows a terminal to report, and at least two network devices associated with the at least two pieces of indication information cooperate to provide a service for the terminal; and reporting RIs based on the at least two pieces of indication information.

Abstract: This application provides a technical solution for rank indication, and especially when a CQI number is not configured or a CQI number is 1, a network device configures a rank indication restriction parameter as that at least one of ranks whose index numbers are 0, 1, 2, and 3 is allowed to be reported by the terminal device; or even if the network device does not perform the foregoing configuration, and none of the ranks whose index numbers are 0, 1, 2, and 3 is allowed to be reported, the terminal device may select at least one rank for RI reporting, so as to resolve a problem that a system cannot work. In addition, according to embodiments of this application, bit overheads required for RI reporting may further be reduced.

Abstract: Embodiments of the present invention provide a channel measurement method and an apparatus. The method includes: for a to-be-measured frequency band that includes at least one reporting subband and 0 or more non-reporting subbands, obtaining channel state information of each reporting subband, where the channel state information of each reporting subband is obtained based on channel estimation, and the at least one reporting subband is included in reporting subbands that are contiguous in frequency domain, or the at least one reporting subband is included in reporting subbands that are not contiguous in frequency domain; and sending a measurement report of the to-be-measured frequency band to a transmit end device, where the measurement report includes the channel state information of one or more of the at least one reporting subband.

Abstract: This application provides a data sending method, a data receiving method, a network device, and a terminal device, to obtain a diversity gain to a greater extent, improve received signal quality, and improve data transmission reliability. The method includes: performing, by a network device, transmit diversity preprocessing on one modulated symbol stream to obtain at least one transmit diversity spatial stream; performing, by the network device, precoder cycling on the at least one transmit diversity spatial stream to obtain at least one precoded data stream, where each of the at least one transmit diversity spatial stream corresponds to at least two different precoding vectors; and sending, by the network device, the at least one precoded data stream to a first terminal device.