Abstract
The increasing use of Internet of Things (IoT) devices in specific areas results in an interference among them and the quality of communications can be severely degraded. To deal with this interference issue, the IEEE 802.11ax standard has been established in hyper-dense wireless networking systems. The 802.11ax adopts a new candidate technology that is called multiple network allocation vector in order to mitigate the interference problem. In this paper, we point out a potential problem in multiple network allocation vector which can cause delays to communication among IoT devices in hyper-dense wireless networks. Furthermore, this paper introduces an adaptive beam alignment algorithm for interference resolution, and analyzes the potential delays of communications among IoT devices under interference conditions. Finally, we simulate our proposed algorithm in densely deployed environments and show that the interference can be mitigated and the IEEE 802.11ax-based IoT devices can utilize air interface more fairly compared to conventional IEEE 802.11 distributed coordination function.
Highlights
According to a recent Cisco technical report [1], there will be 3.5 networked devices per capita by 2021, from 2.3 networked devices per capita in 2016
Which uses MCS9 and MCS10 cannot transmit any data in effect
The reason for this phenomenon is the multi-network allocation vectors (NAVs) policy of IEEE 802.11ax where the inter-BSS NAVs are increased to manage the possible congestion for STA
Summary
According to a recent Cisco technical report [1], there will be 3.5 networked devices per capita by 2021, from 2.3 networked devices per capita in 2016. Envisioning a future WLAN which configures hyper-dense deployment of countless devices in a certain small area, STA may set multiple inter-BSS NAVs and could be excessively delayed for even single transmission. Our algorithm in IEEE 802.11ax enables an STA to transmit data in a densely deployed environment even though it has a set of inter-BSS NAVs or an intra-BSS NAV. The contribution of this paper is an algorithm which mitigates the delay issue of STAs in a heavily dense deployment scenario of 802.11ax-based IoT wireless networks. For this purpose, we propose a low-complexity and swift beam direction selection algorithm that is based on opportunistic beamforming MAC protocols.
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