Abstract:
This application provides a key negotiation method, apparatus, and system, and may be applied to the communications field, for example, short-range communication (including a cockpit domain). During key negotiation between a first device and a second device, the first device notifies, by using first information, the second device of all key negotiation algorithms supported by the first device, and the second device selects, from the received key negotiation algorithms supported by the first device, a key negotiation algorithm supported by the second device. In this way, the key negotiation algorithm selected by the second device is supported by both the first device and the second device.
Abstract:
Embodiments of this application provide a key update method and a related apparatus. One example method includes: sending a first key update request to a second node, where the first key update request includes a first key negotiation parameter and first identity authentication information, and the first identity authentication information is generated by using a first shared key; receiving a first response message from the second node, where the first response message includes second identity authentication information; performing verification on the second identity authentication information by using the first shared key; and if the verification on the second identity authentication information succeeds, determining a first target key based on the first key negotiation parameter.
Abstract:
This application provides a data transmission method and a communications apparatus. The method includes: generating, by an access point, a physical protocol data unit PPDU, where a data part of the PPDU is carried on at least one resource unit RU; sending, by the access point, the PPDU to at least one station by using a channel bandwidth, where the channel bandwidth includes M basic bandwidths, the basic bandwidth is 2.16 GHz, M is an integer greater than or equal to 1, and the M basic bandwidths are divided into the at least one RU; and parsing, by the station, the data part that is of the PPDU and that is carried on the at least one RU. In embodiments of this application, it can implement an OFDMA technology in a high-frequency scenario, and improve channel utilization and transmission efficiency.
Abstract:
An uplink signal transmission method includes receiving, by an active antenna unit of a base station, a first uplink signal sent by a terminal in a first band. The method also includes sending, by the base station, the first uplink signal to a first baseband processing unit of the base station corresponding to a second band for demodulation. The active antenna unit of the base station includes a first array antenna corresponding to the first band and a second array antenna corresponding to the second band. The first band is lower than the second band.
Abstract:
The mainboard includes at least two layers of PCBs and electronic components disposed on each layer of PCB of the at least two layers of PCBs, where each layer of PCB constitutes a unit module. The at least two layers of PCBs are stacked, and the at least two layers of PCBs are electrically connected. Any two adjacent unit modules are connected by using a frame board, and the frame board has a middle-hollow or partially hollow structure. The mainboard is designed into a multilayer composite stacked structure, to reduce an area occupied by the mainboard in horizontal directions and provide plane space for electronic parts such as a display module, a camera module, a speaker box component.
Abstract:
The present invention relates to the field of network communication, and in particular to a data obtaining method and apparatus, and a network storage method and device. The method includes: receiving a request for storing to-be-obtained data, where the request for storing the to-be-obtained data is sent by a service device, and the request for storing the to-be-obtained data includes the to-be-obtained data; storing the to-be-obtained data; receiving a request of a data obtaining apparatus for the to-be-obtained data, where the request includes storage location information about the to-be-obtained data; and returning the to-be-obtained data to the data obtaining apparatus according to the storage location information. By adopting the technical solutions, data is obtained according to the storage location information about the to-be-obtained data. The universal data obtaining apparatus and network storage device are provided for different network applications, thereby reducing complexity of the network storage device.
Abstract:
This application provides information processing methods, apparatuses, and devices. One method includes: obtaining a first password and a first random number, generating a first acknowledgment code of a first node based on the first password and the first random number, and sending the first acknowledgment code and the first random number to a second node. The foregoing method facilitates password authentication and improves authentication efficiency.
Abstract:
Receiving a first request message from a first apparatus through a first secure channel, where the first request message includes an identifier of an electronic control unit of a vehicle; obtaining a first key based on the identifier and security information of the first secure channel; and establishing a second secure channel with the electronic control unit based on the first key, where the second secure channel is used for communication between a cloud server and the electronic control unit.
Abstract:
An upgrade method and an apparatus are provided, and relate to the field of internet of vehicles technologies. When a plurality of devices in an intelligent connected vehicle need to be upgraded, upgrade efficiency and a download speed can be improved, and a load and a storage requirement of a telematics box or a gateway can be reduced. The method includes: receiving upgrade information of a first apparatus from an over the air (OTA) node; establishing a first channel with a server based on the upgrade information of the first apparatus; receiving an upgrade package of the first apparatus from the server through the first channel; and performing upgrade based on the upgrade package of the first apparatus.
Abstract:
Embodiments of this application provide an uplink switching solution. In this solution, switching is performed between an SUL and an NUL, and a switching time period for the switching between the SUL and the NUL is longer than 0 microseconds. Therefore, the SUL and the NUL can share a radio frequency channel, so that the shared radio frequency channel can be switched between the SUL and the NUL, thereby improving utilization of the radio frequency channel, and improving uplink transmission performance.