Abstract:
This paper proposes that the flocking behavior of birds can guide the design of a robust, scalable
and self-adaptive congestion control protocol in the context of wireless sensor networks (WSNs).
The proposed approach adopts a swarm intelligence paradigm inspired by the collective behavior
of bird flocks. The main idea is to ‘guide’ packets (birds) to form flocks and flow towards the
sink (global attractor), whilst trying to avoid congestion regions (obstacles). The direction of
motion of a packet flock is influenced by repulsion and attraction forces between packets, as well
as the field of view and the artificial magnetic field in the direction of the artificial magnetic pole
(sink). The proposed approach is simple to implement at the individual node, involving minimal
information exchange. In addition, it displays global self-* properties and emergent behavior,
achieved collectively without explicitly programming these properties into individual packets.
Performance evaluations show the effectiveness of the proposed Flock-based Congestion Control
(Flock-CC) mechanism in dynamically balancing the offered load by effectively exploiting
available network resources and moving packets to the sink. Furthermore, Flock-CC provides
graceful performance degradation in terms of packet delivery ratio, packet loss, delay and energy
tax under low, high and extreme traffic loads. In addition, the proposed approach achieves
robustness against failing nodes, scalability in different network sizes and outperforms typical
conventional approaches.
