Systems and techniques are described for optimizing secure communications. The base station determines cells to which same frequency resources are allocated, and which cause interference to each other, and determines a starting time slot, at which resource allocation to each cell starts, as a different time slot for each cell, taking into account a number of the cells and time slots constituting time resources. A controller controls the braking force of each wheel by driving the fluid pressure supplying device and controls pressurization of the master cylinder pressure by automatically controlling the pressure apply device.