Abstract
In Wireless Sensor Networks, sensor nodes are deployed to ensure continuous monitoring of the environment which requires high energy utilization during the data transmission. To address the challenge of high energy consumption through frequent independent data transmission, the IEEE 802.11b provides a backoff window that reduces collisions and energy losses. In the case of Internet of Things (IoTs), billions of devices communicate with each other simultaneously. Therefore, adapting the contention/backoff window size to data traffic to reduce congestion has been one such approach in WSN. In recent years, the IEEE 802.11b MAC protocol is used in most ubiquitous technology adopted for devices communicating in the IoT environment. In this paper, we perform a thorough evaluation of the IEEE 802.11b standard taking into consideration the channel characteristics for IoT devices. Our evaluation is aimed at determining the optimum parameters suitable for network optimization in IoT systems utilizing the IEEE 802.11b protocol. Performance analysis is made on the sensitivity of the IEEE 802.11b protocol with respect to the packet size, packet delivery ratio (PDR), end‐to‐end delay, and energy consumption. Our studies have shown that for optimal performance, IoT devices using IEEE 802.11b channel require data packet of size 64 bytes, a data rate of 11Mbps, and an interpacket generation interval of 4 seconds. The sensitivity analysis of the optimal parameters was simulated using NS3. We observed PDR values ranging between 27% and 31%, an average end‐to‐end delay ranging within 10‐15 ms while the energy remaining was between 5.59 and 5.63Joules. The results clearly indicate that scheduling the rate of packet generation and transmission will improve the network performance for IoT devices while maintaining data reliability.
Highlights
The proliferation of the Internet has seen an increase in the growth of the Internet of Things (IoT)
The work done in this paper, seeks to find an optimum payload size combined with its interpacket interval and prevents congestion of the channel if several packets need to be sent in an IoT environment
The primary network parameters used were 32-bytes of payload size transmitted at a data rate of 11 Mbps; simulation time is 1000 s at a packet generation rate of 1 s
Summary
The proliferation of the Internet has seen an increase in the growth of the Internet of Things (IoT). IoTs are similar to Wireless Sensor Networks (WSNs) in their operations They are made up of a large number of small batteryoperated devices that can sense, process, and communicate data wirelessly [1]. Since enforcing fixed transmission schedules might not have proven energy-efficient for networks requiring continuous monitoring, scheduling based on the spatiotemporal differences of data from deployed sensor nodes is proposed and the simulation results are presented in [9]. Medium access control (MAC) protocols implement some scheduling that allows nodes to communicate in a way that prevents multiple collisions and energy wastage. Due to the number of simultaneous transmissions, scheduling transmissions of individual nodes is a challenge in IoTs. In this paper, we examine the effect of network parameters such as the payload size, the packet interarrival interval, and the data rate of the IEEE802.11b.
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