Performance anomaly of Group-Synchronized Distributed Coordination Function in IEEE 802.11ah based Multi-rate IoT Networks
Badarla Sri Pavan, Miriyala Mahesh, Vettath Pathayapurayil Harigovindan · 2020 5th International Conference on Computing, Communication and Security (ICCCS) · 2020
In this paper, we consider dense multi-rate IEEE 802.11ah based Internet of Things (IoT) network with rate adaptation. Here, the nodes access the channel using a group based channel access mechanism known as group-synchronized distributed coordination function (GS-DCF) with default uniform grouping scheme. GS-DCF implements a novel restricted access window (RAW) mechanism, that divides the channel time into several RAW slots, nodes into various groups, and allocates each RAW slot to a group of nodes. GS-DCF plays an important role in reducing collisions and relieving from high channel contention. In such networks, we have observed that the default uniform grouping scheme leads to groups with distinct data rate nodes, which results in severe throughput degradation due to performance anomaly. In this paper, with an accurate analytical model, we report the performance anomaly of GS-DCF and the results are validated with extensive simulations.