Abstract
In this paper, we propose a delay- and power-efficient, multi-user, low-power wireless local area network (WLAN) communication scheme for Internet of Things (IoT) WLAN devices. Extremely low-power operation is one of the key requirements of emerging IoT devices. However, the current duty-cycle-based power saving approach may incur large access delay times owing to the trade-offs between the power consumption and the access delay. In order to reduce this delay and enhance the power-saving performance, wake-up receiver-based schemes have been proposed. However, because wake-up receiver-based schemes do not consider multiuser operation in dense communication environments, large delays are inevitable in the case of multiuser operation. In order to provide extremely low-power operation and under 1-mW standby power with reduced delay, we employed the optimized multiuser transmission scheduling of IEEE 802.11ax in the proposed scheme and proper enhanced distributed channel access (EDCA) parameter settings. This is with the aim to reduce the delay caused by long wake-up times, and to avoid collisions caused by simultaneous transmission in uplink multiuser scenario. By using the proposed scheme, simultaneous IoT communication with multiple mobile IoT devices is possible while providing low-power operation. Simulation results verified the outstanding delay performance of the proposed scheme.
Highlights
The Internet of Things (IoT) has become more widely used in various applications, such as home networks, wearable devices, cattle farms, and warehouses
In order to reduce power consumption in transmission procedure, previously proposed transmission schemes are based on the duty-cycled power saving operation to reduce the idle listening, which refers to the consumption of power while in the idle state without transmitting or receiving data
9, in the transmission with wake-up radio, after the wake-up packet for multiple users is is Figure 9, in the MU transmission with wake-up radio, after the wake-up packet for multiple users transmitted, the data transmission procedure starts with the trigger frame (TF), as in the uplink transmitted, the data transmission procedure starts with the TF, as in the uplink MU OFMDA procedure procedure of IEEE 802.11ax
Summary
The Internet of Things (IoT) has become more widely used in various applications, such as home networks, wearable devices, cattle farms, and warehouses. Most of the previous works have focused on distributed sensor networks, which include tree construction, duty-cycled operation, and wireless energy harvesting operations [1,2]. In duty-cycled operation, sensors turn on and off their transceivers at predetermined times in order to reduce unnecessary power consumption when not transmitting or receiving data. In previous works that aim at realizing power savings, the main target scenario was the distributed sensor network, with low traffic arrival rates in each STA. To resolve the tradeoff problem and meet the various requirements in different kinds of sensor traffic, wake-up receivers and related data transmission schemes for sensors and IoT devices have been developed. Low-Power Wake-Up Receivers Based on On-Off Keying
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