Information Technology Reference
In-Depth Information
Ta b l e 2 .
Coalition Mechanism Downloaded Bytes
Coalitions
Population 1 Population 2
Free Rider
24 Gb
20 Gb
Collaborative
130 Gb
82 Gb
Adaptive
84 Gb
total
154 Gb
186 Gb
abusing as simulation time advances, and from stressing the system resources; and this
leads to a more healthy system.
The Coalition Algorithm () reacts to the inclusion of Adaptive users by increasing by
20% the total amount of downloaded bytes compared to Population 1, this means that
they benefit the whole system. In addition, comparing Coalitions and No Coalitions
with Population 2 (when Adaptive users are simulated), the results are better than with
the Population 1. In this case, the total amount is reduced by 38,78% where 83,15% is
due to the Free Rider's detection.
Note that when using the second population there are fewer Free Riders and Col-
laborative users in the simulation. This affects the data shared and demanded in the
system,and it justifies the smaller amount of downloaded bytes.
Fig. 2.
Evolution of the Downloaded Bytes Distribution (% Bytes vs Time) for No Coalitions
Mechanism , Population 1 (left) and Population 2 (right). Free Rider in red, Adaptive in blue and
green for Collaborative users.
Fig. 3.
Evolution of the Downloaded Bytes Distribution (% Bytes vs Time) for Coalitions Mech-
anism, Population 1 (left) and Population 2 (right). Free Rider in red, Adaptive in blue and green
for Collaborative users.
