Abstract
ZigBee devices are used widely in monitoring applications. The low cost and low power consumption are considered the main characteristics of ZigBee device. ZigBee is based on IEEE802.15.4 standard. Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) mechanism is used in its Medium Control Access (MAC) layer. This mechanism is used to avoid the collisions in the network by creating different backoff time to access the medium. The backoff time is calculated by using Backoff Exponent (BE) value. In this paper, the OPNET simulator is used to evaluate the performance of default IEEE802.15.4 standard. Several scenarios are designed to measure the end to end delay and MAC media access delay. Moreover, the effect of changing the default value of BE on the delay time is studied. Decreasing the value of BE will lead to reduce the range of selecting the backoff time. Thus, the end to end delay and MAC media access delay will decrease when using low value of BE.
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