Abstract
This paper proposes a traffic congestion control algorithm (TCCA) for wireless multimedia sensor networks (WMSNs). First, TCCA uses a combination of two different congestion indicators to precisely detect congestion. The first indicator is buffer occupancy, and the second indicator is buffer occupancy change rate. Second, we develop a feedback-based rate controller to enhance the video quality of played streams. Finally, we present different retransmission mechanisms for different packets. Lost packets are saved temporarily and retransmitted when free channel is available to eliminate congestion. TCCA is implemented on 14 Raspberry Pi sensor nodes. The test-bed results show that TCCA outperforms previous approaches in terms of rate control and packet loss.
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