A method and apparatus are described for controlling the data rates for communications to and from a base station and a plurality of remote users. The UE sets a happy bit for a current process based on a different criterion, depending on the current process is an active process activated for scheduled transmission or an inactive process allowed for non-scheduled transmission. The height of the stack is determined by the maximum spherical aberration permissible for the system. The light transmission layer consists of liquid crystal cells. Subsequently, hydrogen peroxide is added to the chloric acid in an amount which is equal to or larger than the amount necessary for a reduction reaction to thereby yield chlorous acid. The insertion is responsive to a channel change request.