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.

Abstract: This application provides a data sending method and apparatus, and a data receiving method and apparatus, so that based on different channel quality, different transmission schemes can be flexibly used to transmit data, to improve data receiving quality and improve a spatial degree of freedom. The method includes: precoding, by a network device, a plurality of spatial flows to obtain a plurality of precoded data flows, where the plurality of spatial flows are homed to at least two transmission schemes, and the at least two transmission schemes include precoder cycling; and sending the plurality of precoded data flows.

Abstract: This application discloses an information transmission method, apparatus, and system, and belongs to the field of communications technologies. The method includes: generating, by a base station, amount indication information, where the amount indication information is used to indicate a maximum amount of downlink control information; sending, by the base station, the amount indication information to user equipment; receiving, by the user equipment, the amount indication information; and receiving, by the user equipment, downlink control information based on the amount indication information. In this application, the amount indication information is sent to the user equipment, so that the user equipment receives the downlink control information based on the amount indication information. This can resolve a problem that complexity of blind detection performed by the user equipment is relatively high, thereby reducing the complexity of the blind detection performed by the user equipment.

Abstract: Embodiments of the present invention provide a precoding information obtaining method and a device. The method includes: separately precoding, by a network device by using N sub-codebooks, a pilot group including K pilots to obtain N precoded pilot groups, where the sub-codebooks are subsets of a precoding codebook, the precoding codebook includes M precoding vectors, each sub-codebook includes K precoding vectors; sending, by the network device, a precoded pilot group to a terminal device in each of W RB groups; and receiving, by the network device, precoding information fed back by the terminal device for any one of W precoded pilot groups. According to the precoding information obtaining method and the device, a quantity of pilot signals sent by the network device in each RB group is reduced, and pilot overheads in each RB group are reduced.

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: The present disclosure provides a camera module, a circuit board assembly and a manufacturing method thereof, and an electronic device with the camera module, wherein the circuit board assembly comprises at least one electronic component, a substrate, and a molding unit. At least one of the electronic components is connected to the substrate conductively on a back face of the substrate. The molding unit comprises a back molding portion and a molding base, wherein the molding base is bonded to a front face of the substrate integrally when the back molding portion is bonded to at least a part of an area of the back face of the substrate integrally. There may be no need to reserve a position on the front face of the substrate to conductively connect the electronic components, so that the length and width of the camera module can be reduced, thereby reducing the volume of the camera module.

Abstract: Embodiments of the present invention disclose a precoding information collection method and a transmission device and relate to the communications field. A specific solution is: precoding, by a transmit side, a first pilot signal according to a first precoding matrix, and sending a precoded first pilot signal to a receive side, where the first precoding matrix is the same as a precoding matrix used for current data transmission; precoding, by the transmit side, N second pilot signals according to N second precoding matrices, and sending N precoded second pilot signals to the receive side, where N is an integer greater than or equal to 1, the second precoding matrices used for precoding the second pilot signals are different from each other, and the N second precoding matrices are different from the first precoding matrix; and receiving, by the transmit side, precoding feedback information sent by the receive side.

Abstract: A camera module includes an optical lens, a photosensitive chip and an electrical support. The electrical support includes a circuit module embedded in a support body to form an integral structure, a connecting member provided on the support body to electrically connect with the circuit module, and a camera component coupled at the support body and electrically connected to the connecting member. Therefore, the electrical support not only forms a circuit board to electrically connect with the camera component but only serves as a base to support the camera component.

Abstract: A method for manufacturing a semiconductor module for an image-sensing device is disclosed. The method may comprise forming a first molding component on a first surface of a printed circuit board (PCB); mounting at least a photosensitive member to a second surface of the PCB; and forming a second molding component on the second surface of the PCB. The PCB may comprise at least an electric component on the first surface of the PCB. The first molding component may encapsulate the at least one electric component with the PCB. The second molding component may secure the photosensitive member on the PCB.

Abstract: Embodiments of the present disclosure provide a method for obtaining channel state information, including: sending, by a base station, one or multiple pieces of downlink signaling to user equipment, where the one or multiple pieces of downlink signaling instruct the user equipment to feed back channel dimension information, where the channel dimension information includes an effective dimension of a channel subspace of a statistical channel between the base station and the user equipment, and the effective dimension of the channel subspace is less than a quantity of reference signal ports used to measure channel state information; and receiving, by the base station, the channel dimension information fed back by the user equipment.

Abstract: Embodiments of the present invention apply to the technical field of communications, and disclosed are a network switching method, system, and network side device. In the embodiment of the invention, within coverage of network side devices on one signaling plane, when a current network side device bearing data plane information of a terminal device determines that handover from the current network side device to a target network side device is required, the current network side device performs handover confirmation with the target network side device, so that the target network side device enables a data plane information communication function with the terminal device and completes switching the bearer of the data plane information.

Abstract: A camera module includes an optical lens, a photosensitive chip and an electrical support. The electrical support includes a circuit module embedded in a support body to form an integral structure, a connecting member provided on the support body to electrically connect with the circuit module, and a camera component coupled at the support body and electrically connected to the connecting member. Therefore, the electrical support not only forms a circuit board to electrically connect with the camera component but only serves as a base to support the camera component.

Abstract: Embodiments of the present disclosure provide a channel measurement method and user equipment. In one example method, a first transmission control information is received. A semi-persistent channel measurement is started when the first transmission control information meets a first preset condition, where the first preset condition includes at least one of the following conditions: the first transmission control information is associated with a radio network temporary identifier RNTI of a first preset type, and a value of a first group of information in the first transmission control information meets a first preset rule.