A method of improving PRR for WiFi interference avoidance in ZigBee networks in indoor environments

This paper focuses on how to avoid RF interferences when deploying WiFi/ZigBee radios simultaneously. The circumstances are particularly unfavourable for ZigBee networks that share the 2.4 GHz ISM band with WiFi senders capable of 10 to 100 times higher transmission power. Thus, we propose a method of minimising interference from WiFi, while limits ZigBee's occupancy rate. Another important point to be considered here is that packet reception ratio (PRR) varies with the shape of crossing corridors. Our proposed method to avoid interferences is the use of channel hopping. This channel hopping will be applied by evaluating the two values on receiver node: the received signal strength and the received acknowledged packets. The another method to increase PRR depending on the type of crossing corridors is to deploy intermediate nodes with the shortest distance to its neighbours. This method conducts an efficient topology of multi-hop ad hoc wireless network.