Recently, we have entered the age when individuals have at least one or more smartphones and tablets. Moreover, many domestic electrical devices are also connected to the Internet. WLANs are also widely used not only in homes, but also in businesses, factories, automobiles, etc. The proliferation of WLANs have also contributed significantly to the growth of the smartphone market. Faster 5G smartphones have begun to appear on the market, and WLANs have been increasing in speed to keep pace.