Algorithm 1 Congestion detection function

Data: C, DP, CAF, and Result: Congestion level: state

1 if (current_state = = I) then

2    if ((TLow ≤DP < THigh) and (TLow ≤ CAF < THigh) AND (TLow ≤ C < THigh)) then

3       current_state = II; congestion_resolution (state II);

4    else if ((CAF ≥ THigh) OR (C ≥ THigh) OR (DP ≥ THigh)), then

5       current_state = III; congestion_resolution (state III);

6    end

7 else if (current_state = = II) then

8    if ((DP ≥ THigh) OR (CAF ≥ THigh) OR (C ≥ THigh)), then

9         current_state = III; congestion_resolution (state III);

10    else if ((DP < TLow) AND (CAF < TLow) AND (C < TLow)) then

11       current_state = I; congestion_resolution (state I);

12    end

13 else if (current_state = = III) then

14    if ((TL ≤ DP < THigh) AND (TLow ≤ CAF < THigh) AND (TLow ≤ C < THigh)) then

15       current_state = II; congestion_resolution (state II);

16    else if ((DP < TLow) AND (CAF < TLow) AND (C < TLow)) then

17       current_state = I; congestion_resolution (state I);

18    end

19 end