Abstract: This application discloses a network connection method and apparatus, an electronic device, and a readable storage medium. The method includes: establishing a first packet data network (PDN) connection through a first mobile communication network; sending registration request information to a second mobile communication network when a data network of an electronic device is in a disabled state; and disconnecting the first PDN connection when the first PDN connection is handed over from the first mobile communication network to the second mobile communication network.

Abstract: An optical interconnection system and method are provided. The system includes two or more basic components that are stacked and interconnected. The basic component includes an optical network layer and an electrical layer, where in each basic component, the optical network layer is electrically interconnected with the electrical layer, and the optical network layer of each basic component is optically interconnected with an optical network layer of an adjacent basic component, and through optical interconnection in three-dimensional space, a limitation on a quantity of stacked electrical layers is reduced, and efficiency of signal transmission is increased.

Abstract: An optical interconnection system and method are provided. The system includes two or more basic components that are stacked and interconnected. The basic component includes an optical network layer and an electrical layer, where in each basic component, the optical network layer is electrically interconnected with the electrical layer, and the optical network layer of each basic component is optically interconnected with an optical network layer of an adjacent basic component, and through optical interconnection in three-dimensional space, a limitation on a quantity of stacked electrical layers is reduced, and efficiency of signal transmission is increased.