An electronic device in a wireless communication system, and a wireless communication method. The electronic device at a user equipment side, performs a device-to-device (D2D) communication with a target user equipment, and the electronic device includes: processing circuitry configured to acquire information on a first power parameter from a base station device, the first power parameter indicates a D2D nominal power for the electronic device to perform D2D communication, the D2D nominal power different from a cellular nominal power for the electronic device to perform a cellular communication with the base station device; and determine, irrelevant to a path loss between the electronic device and the target user equipment, based on the first power parameter, a D2D transmission power for performing the D2D communication between the electronic device and the target user equipment.