DELAY-AWARE SUPERFRAME CONTROL IN CLUSTER-TREE WPANS

Abstract

The IEEE standard for Wireless Personal Area Network (WPAN) is IEEE 802.15.4, which aims to provide low data rate, low power consumption, and a low-cost solution.  Another important feature this standard can support is low-duty-cycle operation, which is well-suited to low-power devices. Due to the fixed-duty-cycle operation of IEEE 802.15.4, delay is always a primary concern, leading to low throughput. Therefore, an efficient algorithm is required to overcome the existing problem. In this paper, we propose a delay mitigation algorithm that adjusts the super-frame structure. The PAN coordinator dynamically adjusts the SO parameter of cluster heads based on packet receive ratio, data rate, number of cluster heads, and delay observed at cluster heads. Detailed simulation analysis of the proposed algorithm is compared with the standard IEEE 802.15.4, which shows better results in terms of latency, packet delivery ratio, and throughput.