Novel Congestion Avoidance Mechanism ZigBee-Based Wireless Sensor Network

In a larger scale ZigBee wireless sensor network, congestion will be an inevitable issue. Especially, in many environment monitoring or industry applications, it is impossible to omit the case. Thus, there is realistic motivation to address this fundamental problem. In the paper, we improve the transmission fashion of synchronization mechanism in IEEE802.15.4/ZigBee protocol with one random method, and pose a time-sharing transmission fashion to avoid congestion. Experimental results indicate that the two proposed methods can significantly reduce collision and, as a result, congestion avoidance can be implemented. The validity of proposed strategies is intuitively demonstrated through an experimental test-bed based on open-source implementation of IEEE802.15.4/ZigBee protocols.