Abstract: A communication method, to enable an access network device to manage a terminal device, includes obtaining identification information of a first terminal in a target terminal based on first information from a first network element, where the target terminal includes one or more terminals; sending the identification information of the first terminal to the first network element; receiving an indication of a first operation from the first network element; performing the first operation on the first terminal according to the indication of the first operation; and sending a first execution result to the first network element, where the first execution result is a result of the first operation performed by the first terminal. A communication distance between the access network device and the terminal is not limited.

Abstract: Embodiments of this application provide a communication method and apparatus. The method includes: An access network device receives a first request message used to request to execute a first operation on target terminals, where the first request message includes identification information of the target terminals and indication information of the first operation. The access network device sends, to the target terminals, a first query request used to obtain the identification information of the target terminals, and receives first identification information from a first target terminal of the target terminals. The access network device having a card reader function executes an operation on a terminal. This avoids cases small scope and scale of applicable scenarios caused by a short communication distance between a card reader and the terminal.

Abstract: A first network element receives a first message. The first message is for requesting to perform a target operation on one or more terminal devices. The first network element sends request information to an access network device. The request information is for requesting to obtain identification information of the one or more terminal devices.

Abstract: This application provides a data transmission method and apparatus, to resolve a problem that flexibility of a data packet transmission mode in a passive internet of things is poor. The method includes: receiving a first message, where the first message is used to request to perform an operation on information about an electronic tag; obtaining first information; determining a transmission mode based on the first information, where the transmission mode is transmission via a user plane; and triggering establishment of a transmission channel between an access network device and a user plane function network element, where the transmission channel is used for transmission of a result of the operation on the information about the electronic tag. In the foregoing mode, the tag management function may flexibly select a transmission path, and may select the user plane for transmission, so that signaling overheads can be reduced.

Abstract: Embodiments of this application provide a target terminal management method, apparatus, and system. The method includes: A tag management function network element sends a first instruction to an access network device, where the first instruction includes information about a target terminal, the target terminal includes a first terminal, and the first instruction instructs the access network device to perform a first operation on the target terminal; and the tag management function network element receives a result of the first operation, where the result of the first operation includes an identifier of the first terminal.

Abstract: Provided are a phase quadrature four-wavelength demodulation system and method of an optical fiber F-P cavity sensor. The phase quadrature four-wavelength demodulation system of the optical fiber F-P cavity sensor includes a flat ASE broadband light source, an optical fiber circulator, a dense wavelength division multiplexer, a photoelectric detector, and a data acquisition processing unit. The flat ASE broadband light source is connected to the optical fiber circulator, the optical fiber circulator is connected to the dense wavelength division multiplexer, the dense wavelength division multiplexer is connected to the photoelectric detector, and the photoelectric detector is connected to the data acquisition processing unit.

Abstract: Provided are a phase quadrature four-wavelength demodulation system and method of an optical fiber F-P cavity sensor. The phase quadrature four-wavelength demodulation system of the optical fiber F-P cavity sensor includes a flat ASE broadband light source, an optical fiber circulator, a dense wavelength division multiplexer, a photoelectric detector, and a data acquisition processing unit. The flat ASE broadband light source is connected to the optical fiber circulator, the optical fiber circulator is connected to the dense wavelength division multiplexer, the dense wavelength division multiplexer is connected to the photoelectric detector, and the photoelectric detector is connected to the data acquisition processing unit.