Algorithm 3: This procedure calculates the Back-off value for a node

1: procedure BACK·OFF(traffici(t), Priorityi(t), CWmax, CWmin)

2: while traffici(t) == emergency do

3:  Calculate CWnewmax(t) // as shown in Equation (5)

4:  Back-offi(t) = Random([0,CWnewmax(t)])

5: end while

6: while traffici(t) == non-emergency do

7:  Back-offi(t) = Random([CWmin,CWmax])

8: end while

9: end procedure