Abstract
This paper proposes a novel and energy efficient Internet of Things (IoT) communication scheme for next generation Wireless Local Area Network (WLAN). There are a couple of crucial requirements among unique IoT requirements: a large number of communication devices must be supported, and they must have low power consumption. Since sensor-type IoT devices, which are expected to be one of the major types of IoT devices, normally generate uplink traffic rather than downlink traffic, an energy efficient multiuser uplink transmission scheme is a crucial feature of IoT communication. In the next generation WLAN, IEEE 802.11ax, Orthogonal Frequency Division Multiple Access (OFDMA) is adopted to support a greater number of devices. However, uplink OFDMA procedures that consider the unique IoT requirements have not been fully considered in the next generation WLANs. A random access-based WLAN uplink OFDMA transmission scheme is proposed in this paper, and analytical modeling of the proposed scheme is provided. The proposed random access-based WLAN uplink OFDMA transmission scheme is able to dynamically adjust the number of contending users by uniquely applying congestion status in a very simple and distributed manner. Our numerical analysis and extensive simulation corroborate the fact that the proposed scheme is able to support a greater number of IoT devices with less power consumption.
Highlights
Nowadays, an ever-increasing number of devices are connected to the Internet, and it is anticipated that Internet of Things (IoT) will be one of the major communication types in future wireless communications
TWT interval Delayed once IoT STAs are associated with AP or have received any beacon frames, they could participate in the scheduled UL MU transmission at the indicated target wake time
As described in the previous section, it is assumed that AP periodically triggers multiuser uplink Orthogonal Frequency Division Multiple Access (OFDMA) with trigger frame (TF), and IoT devices, which are active at the current TWT period, participate uplink MU transmission
Summary
An ever-increasing number of devices are connected to the Internet, and it is anticipated that IoT will be one of the major communication types in future wireless communications. Sufficient available ISM bands, efficient multiuser support with OFDMA, and advanced power saving schemes make IEEE 802.11ax a good candidate for advanced IoT WLAN systems. The proposed scheme further provides a novel dynamic OFDMA congestion control feature to support a large number of IoT devices, regardless of the number of simultaneously contending users. Since efficient power consumption can be provided with very short MAC access delay and narrow subband transmission by using the proposed scheme and a large number of users can be supported with autonomous congestion-controlled multiuser OFDMA transmission, the two important IoT requirements can be met. The two main contributions of this paper are a novel power-efficient uplink multiuser transmission scheme with autonomous congestion control and analytical modeling of both the IEEE 802.11ax OFDMA transmission and the proposed schemes.
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