Abstract: A channel characteristic map determination method and an apparatus, where the method includes: at least one of a terminal device or an access network device senses an environment based on a communication pilot signal and a sensing device such as a radar, an infrared sensor, a camera, or a point cloud laser scanner, to obtain material information of a scatterer and at least one of relative position information between the scatterer and the terminal device/or relative position information between the scatterer and the access network device, and transmits the foregoing information to a channel characteristic map management apparatus by using a first message.

Abstract: Embodiments of this application provide a communication method and apparatus. In the method, a network device receives first information from a terminal device, where the first information includes information about a first location and a movement speed of the terminal device, and the first location is a location of the terminal device. The network device predicts, based on the first information, a second location at which the terminal device performs channel estimation, and determines a first channel covariance matrix, where the first channel covariance matrix is a channel covariance matrix of a downlink channel corresponding to the second location, and the first channel covariance matrix is for determining downlink channel state information. The network device sends the first channel covariance matrix to the terminal device.

Abstract: A communication method and a communication apparatus are provided. The method includes: sending motion information of a terminal device and sending time information of a first antenna in a first virtual antenna array to a network device; receiving first configuration information from the network device, where the first configuration information is used to configure a first reference signal corresponding to the motion information and the sending time information; sending the first reference signal to the network device based on the first configuration information; and receiving a first multipath angle from the network device, where the first multipath angle indicates a multipath angle at which the first reference signal reaches the network device. The first antenna is any antenna in the first virtual antenna array.

Abstract: A combined system of a concealed closed tracheoscope and an artificial airway breathing circuit includes an artificial airway breathing tubing and a tracheoscope. The artificial airway breathing tubing includes an inhalation circuit and an exhalation circuit that are connected through a connecting tube. The tracheoscope includes a handle portion and an insertion portion connected to the handle portion. The tracheoscope handle portion wraps around a section of the exhalation circuit. The tracheoscope insertion portion is hidden in the extendable breathing circuit, which extends and retracts to make the tracheoscope insertion portion advance or retreat in a closed condition. The tracheoscope handle function assembly cleverly wraps around the surface of the breathing circuit tubing, organically combining the functions of the tracheoscope handle and the breathing circuit.

Abstract: A combined system of a concealed closed tracheoscope and an artificial airway breathing circuit includes an artificial airway breathing tubing and a tracheoscope. The artificial airway breathing tubing includes an inhalation circuit and an exhalation circuit that are connected through a connecting tube. The tracheoscope includes a handle portion and an insertion portion connected to the handle portion. The tracheoscope handle portion wraps around a section of the exhalation circuit. The tracheoscope insertion portion is hidden in the extendable breathing circuit, which extends and retracts to make the tracheoscope insertion portion advance or retreat in a closed condition. The tracheoscope handle function assembly cleverly wraps around the surface of the breathing circuit tubing, organically combining the functions of the tracheoscope handle and the breathing circuit.

Abstract: A method includes: A first apparatus receives a reference signal from a second apparatus. The first apparatus determines first indication information based on the reference signal, and sends the first indication information. The first indication information is for constructing a first covariance matrix corresponding to a channel matrix, and the channel matrix indicates channel state information of a channel between the first apparatus and the second apparatus.

Abstract: Embodiments of this application provide a channel state information (CSI) reporting method and a communications apparatus. In the method, a receiving device obtains first CSI and second CSI, and determines reference information based on the first CSI and the second CSI. The first CSI is correlated with the second CSI, the reference information includes first quantization information including projection quantization information of a common subspace and second quantization information including projection quantization information of a first non-common subspace, the common subspace includes an intersection of a first space used to quantize the first CSI and a second space used to quantize the second CSI, and the first non-common subspace includes a subspace other than the common subspace in the first space. The receiving device sends the reference information to a sending device, and the sending device determines the first CSI based on the reference information and the second CSI.