Abstract
In wireless networks, users may experience outages owing to low received signal strength. Divergent from other research, we investigate the outages for users of CSMA/CA-based wireless networks when multiple access points (APs) and multiple users are randomly positioned in a given area. We model the locations of the APs and users using independent homogeneous Poisson point processes (PPPs), and analyze the signal outage probabilities of users when there are different numbers of access points, as well as when different modulation and coding schemes (MCSs) are used for communication. We also investigate heterogeneous CSMA/CA-based wireless networks, wherein the APs use different transmit powers. Then, we evaluate the results and compare the signal outage rates of users with the signal-to-interference-plus-noise ratio (SINR) outage rates of users in both homogeneous and heterogeneous IEEE 802.11a wireless networks using extensive event-driven simulations. The simulation results validate our analysis on the signal outages of users in multi-cell, multi-user wireless networking environments, and show that a significant portion of outages are caused by the signal outages when AP densities are low and high MCS levels are used for communication.
Highlights
Emerging Internet of Things (IoT-) based services [1], such as smart homes [2] and smart vehicles [3], require technical development in various fields such as power control [4] and privacy [5]
We differentiate the signal outages from the signal-to-interference-plus-noise ratio (SINR) outages, and analyze the signal outages when different numbers of users and access points (APs) are randomly positioned with different Poisson point processes (PPPs) densities in a given area, and when different modulation and coding schemes (MCSs) levels are used for communication between them
This paper investigates the signal outages that users may experience in CSMA/CA-based wireless networks
Summary
Emerging Internet of Things (IoT-) based services [1], such as smart homes [2] and smart vehicles [3], require technical development in various fields such as power control [4] and privacy [5]. Because of the (unorganized) dense installation of IEEE 802.11 APs and the popularity of using IEEE 802.11 wireless networks, users of IEEE 802.11 wireless networks may experience poor performance from the SINR outages in crowed areas, the received radio signal strengths from their serving APs are high. The use of heterogeneous CSMA/CA-based wireless networks has not attracted much attention compared to heterogeneous cellular networks This is mainly because the different transmit powers of APs in CSMA/CA-based wireless networks may introduce unfairness among users, and most IEEE 802.11 wireless networks operate without central management. Because virtually all smartphones can use IEEE 802.11 wireless networks, and an increasing number of consumer products in markets are equipped with IEEE 802.11 wireless networking capability, we investigate the signal outages and SINR outages of users in heterogeneous IEEE 802.11 wireless networks as well as the homogeneous cases
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