Please select the most similar patent number from A, B, C and D. Which number is?
A method for transmitting service information, and an electronic device. The method comprises: a first terminal device using user information of the first terminal device to perform authentication with an IoT server, and obtaining token information for communicating with the IoT server; and the first terminal device communicating with the IoT server by means of the token information. During the process of authentication between a first terminal device and an IoT server, user information of the first terminal device is used, thereby avoiding the need to bind a first IoT terminal device with the IoT server. When the first IoT terminal device and the IoT server are devices from different manufacturers, the first IoT terminal device and the IoT server can also communicate with each other, such that the applicability can be improved, and the need to deploy different IoT servers for IoT terminal devices from different manufacturers is also avoided, which can reduce costs.
A: Disclosed in embodiments of the present description are an electronic certificate transmission method, apparatus and device. During a process of obtaining a business service, a first user can carry out, using a terminal by means of near-field communication, information communication with a terminal used by a second user to obtain user information of the second user, so that the first user can simultaneously send the obtained user information of the second user and identifier information of an electronic certificate of the first user to a business server providing the electronic certificate, and thus the business server can check the user information of the second user and delivers the same electronic certificate to the second user after the check succeeds, thereby implementing the sharing of the electronic certificate.
B: A method and device for establishing a map model. The method comprises: by receiving first dimension information, second dimension information, and third dimension information sent by a first terminal device, a server can associate the position, image information, and description information of any of a plurality of target time points to obtain feature information of the target time point, thereby establishing a map model. Because the server establishes the map model according to data of a plurality of dimensions acquired by the first terminal device, and the first terminal device does not need to perform communication interaction with other hardware devices (for example, an access point device) when acquiring the data of the plurality of dimensions, no other hardware device is required to be deployed in a building, so that hardware costs can be effectively reduced.
C: An information input method, device, and system. The method comprises: receiving information input conversion information sent by a user by means of a first terminal device (101); determining a second terminal device according to setting information of the user, and sending an input operation instruction to the second terminal device (102); and receiving information content input by the second terminal device by means of an input means according to the input operation instruction, and displaying the information content in the first terminal device (103). When a user needs to input information content, the user can send information input conversion information by means of a first terminal device; a server can transfer an input operation of the user to a second terminal device; when the data amount of the information content to be input is relatively large, the information content can be input by means of an input means of the second terminal device. Compared with inputting information content by means of an information input page provided by the first terminal device in the prior art, the information content input efficiency is effectively improved, and the user experience on the first terminal device is also improved.
D: A positioning method, an apparatus, and a system. Suitable for internet of vehicles, connected vehicles, autonomous driving, and other scenarios, and able to solve the problem of a first terminal device having low positioning accuracy due to an unsuitable reference object. The method comprises: a server receives a first message from a first terminal device. Where the first message comprises first position information determined by the first terminal device. The server determines a first reference object according to the first position information. the server sends a second message to the first terminal device. Where the second message comprises identification information of the first reference object, the identification information of the first reference object being used by the first terminal device to update the first position information. By utilizing the provided method, positioning accuracy of the first terminal device can be improved.
Answer: A