Improving Multi-path Congestion Control for Event-Driven Wireless Sensor Networks by Using TDMA

In this paper, we propose a time division method to solve the congestion control problem for an event-driven sensor network. In this method, a node adjusts time (therefore bandwidth) assigned to each upstream node by a dynamic TDMA approach to efficiently use resources available to the system and avoid the situation in which a node cannot send event information to the BS on time through the insufficiently allocated bandwidth when it detects multiple events in a short time span. Experimental results show that this method can effectively improve a WSN´s throughputs, shorten end-to-end delays and reduce packet loss rates.