Abstract: This application provides a signal transmission method and a related device. According to the signal transmission method, when two contact points on an electronic device are respectively in contact with two contact points on a keyboard, the electronic device may transmit a power signal and a GND signal to the keyboard through the contact points that are in contact with each other, that is, the electronic device may supply power to the keyboard. In addition, when a user presses a key on the keyboard to perform input, the keyboard may transmit key position information to the electronic device through a contact point that is in contact with the electronic device. In this signal transmission method, no Bluetooth chip needs to be built into the electronic device and the keyboard, reducing device costs.

Abstract: This application provides a method for unlocking a terminal device by a wearable device and a communication system. The method includes establishing, by the wearable device, a binding relationship with the terminal device when the wearable device is in a being-worn state; removing, by the wearable device, the binding relationship with the terminal device in response to determining that a wearing status of the wearable device is changed; generating, by the wearable device, motion data that matches a motion track of the wearable device, in response to a user making a motion with the wearable device; sending, by the wearable device, an unlock request to the terminal device in response to determining that the motion data matches preset reference data; and performing, by the terminal device, an unlock operation in response to receiving the unlock request and determining that the terminal device displays an unlock screen.

Abstract: This application provides a method for unlocking a terminal device by a wearable device and a communication system. After an owner of a wearable device is authenticated, a user wearing the wearable device can unlock a terminal device by making a preset motion. The unlock process is simple and convenient and can ensure security of the terminal device and improve user experience.

Abstract: A method for controlling an electronic device by a wearable device and a communication system, so as to identify various motion tracks of a user when a wearable device is worn, and to generate motion data that matches the motion tracks, thereby generating and sending a control instruction based on the motion data to control the electronic device. Therefore, the user may perform different actions in a case in which the wearable device is worn, so as to implement control over different functions of the electronic device.