The terms of these equations will be described next. The average transmitted bits are calculated as the transmitted 'bits per frame of type 1 multiplied with the probability of having this type of frame, for all data rates above or equal to the threshold value. The formula *Pjr(ì, m, N, fy, r.)* represents the probability of having a frame of type i transmitted with a rate of *feci* . For a given number of slots m, in a system with N users and a SNIR threshold *7* •