Study on Throughput of Network with Selfish Nodes Based on IEEE 802.15.4 - Advanced Research on Computer Education, Simulation and Modeling - page 416

network, the No.0 node is destination node, and the No.1--20 nodes are source nodes.
We adopt TCP protocol in agent layer and FTP in the application layer and the packet
size is 1500 bytes. As selfish level increases from 0 to 1, network throughput analysis
results as shown in figure 7.

x 10 5

Throughput of Network with different selfish level
Throughput with selfish level increase

2.5

2

1.5

1

0.5

0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Selfis h Level P

Fig. 7. Network throughput with different selfish level

As shown in Fig. 7, When no selfish node exist (P=0), network throughput is reach
238680 byte, but with P increasing, the throughput appear in large fluctuations, when
P=1, the network throughput reduce to 1304 byte.

3 Conclusions

In this paper, we analyze the impact of selfish behavior on network. Although the
selfish node seriously affects the fairness of the network and occupies the majority of
the channel resource and also reduces the throughput, it greatly decreases the packet
loss rate.
Our future work will focus on the model and improvement of the protocol since the
throughput of the network is greatly decreased due to the introduction of selfish node.
In order to use well in practical application, we also plan to take measures in the pro-
tocol to against and handle selfish behavior.

References

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2. Paul, U., Das, A.R.: Detecting elfish Carrier-Sense Behavior in Wi-Fi Networks by Passive
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