Modeling and throughput analysis of randomly deployed IEEE 802.15.4 based Wireless Personal Area Networks

This paper presents Markov Chain modeling of the randomly deployed IEEE 802.15.4 based Wireless Personal Area Networks (WPAN) in which, the wireless sensor nodes communicate to the coordinator in a single hop. In Most of the previous works, the un-slotted Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) channel access mechanism and the sensor nodes without buffer are considered for the sake of simplicity. In real time networks, every sensor node will have a finite amount of buffer. In this work, we considered nodes with finite buffer, beacon enabled data transfer with no acknowledgements and no re-transmissions. The influence of buffer size of the sensor node and packet size on the throughput is analyzed in separate experiments. The Network is simulated using ns-2. The experimental results are in close agreement with the theoretical values.