Abstract
IEEE 802.15.4 standard provides a Guaranteed Time Slot (GTS) mechanism for time sensitive wireless networks in the beacon-enabled mode. However, the bandwidth underutilization problem may become worse when the traffic flow with various arrival rates leads to variance between the arrival rate and the guaranteed bandwidth which is allocated to satisfy the case of the maximal arrival rate. To overcome this limitation, we propose an Adaptive GTS Allocation scheme through feedback mechanism in beacon-enabled IEEE 802.15.4 networks to periodically reallocate the GTS bandwidth, taking into account the current arrival rate specifications and delay requirement of traffic flows. We validate the efficiency of the proposed scheme by simulation by comparing it with the MAC protocol of IEEE 802.15.4.
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