PERFORMANCE ANALYSIS OF IEEE 802.15.4 CHANNEL ACCESS MECHANISMS DURING EVENT DETECTIONS IN WIRELESS SENSOR NETWORKS

The IEEE 802.15.4 protocol defines the medium access control layer of Zigbee, a widely implemented WSN technology. This implements both guaranteed time slot (GTS) scheme, where note request for slot(s) to transmit their packets collision-free and contention-based scheme nodes randomly draw back-off counter win channel access. paper analyzes performance schemes in WSNs when an event is detected packet arrival rate network increases using delivery ratio(PDR), throughput latency as quality service parameters. We consider various densities (4, 9 16 within common transmission range). Simulations Castalia 3.2 shows GTS has better PDR than 4 network. However, dense (16 nodes), increases, outperforms scheme.