Algorithm 3. BENS Algorithm For Reservation (BENS-R).

Input: N number of available channels in the CRN,    Nnp Number of PU-occupied channels in Unreserved CRN    Nns Number of SU-occupied channels in Unreserved CRN    Nrp Number of PU-occupied channels in Reserved CRN    Nrs Number of SU-occupied channels in Reserved CRN    fa number of failed channels in the CRN    maxres number of maximum reserved channels    values Ki such that Ka+1 < Ka < Ka − 1 < Ka − 2...< Ki <...<K0;    i = 1 to a, where Ka and Ka+1 = 0 Output: M number of reserved channels in the CRN, Step 1: Calculate β = (pn + qn + pr + qr)/(Q − e) Step 2: Find MAvailable = Q − (pn + qn + pr + qr + e) Step 3: Find RN = pr + qr Step 4: while(k > 0) do    if (ki + 1 ≤ β < ki)    thentraffic_threshold_level = j;    k = k − 1; repeat Step 5: do break; Step 6: end Step 7: Switch to operating mode: Operating mode = 0 indicates that the objective is to increase the retainability of current monitoring services. Operating mode = 1 denotes the increase in the availability of channels for fresh users. Step 8: if selected Operating mode = 0 then Step 9: M’ = maxres − traffic_threshold_level Step10: end Step 11: if selected Operating mode = 1 then Step 12: M’ = maxres − (a-traffic_threshold_level) Step 13: end