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Comparing Wireless Communication Protocols
Wi-Fi is a technology based on the IEEE 802.11 suite
of standards that uses radio frequencies (RF) extend
wired Ethernet-based local area networks (LAN) to
Wi-Fi-enabled devices, allowing the devices to receive
and send information from the internet.
How does it work? Wi-Fi uses Internet Protocol (IP) to communicate
between endpoint devices and the LAN. A Wi-Fi connection
is established using a wireless router that is connected to the network
and allows devices to access the internet.
One disadvantage of Wi-Fi is that it may be prone to interference
depending on the RF environment it’s operating in. Everything from
other Wi-Fi signals to radio waves emitted by microwave ovens to
cement walls can interfere with your data transmission. That’s where
Wi-Fi’s two frequencies, 2.4GHz and 5GHz, come in. Wi-Fi can
broadcast on both frequencies, helping its signal cut through all the
noise and deliver a fast, strong signal from your wireless router to
your device.
What applications is it best for? LAN video, e-mail, and web applications
requiring higher data rate network connections (1Mbps-1Gbps).
LI-FI
What is it? Li-Fi is a form of visual light communication that sees
light waves from LED bulbs for high-speed wireless communication.
It is used to exchange data quickly and securely at a much lower
power level compared to Wi-Fi.
How does it work? When a constant current source is applied to
an LED bulb, it emits a constant stream of photons observed as visible
light. When this current is varied slowly, the bulb dims up and down.
Since the bulbs are semiconductors, the current and optical output
can be modulated at extremely high speeds that can be detected by a
photodetector device and converted back to electrical current.
Li-Fi has fewer interference issues than RF technology, making
it ideal for dense environments where Wi-Fi may fall short. It can’t
penetrate solid materials, which makes it more secure, but also means
a Li-Fi network in a building would need multiple transmitter bulbs,
so a mobile user could experience seamless wireless coverage as they
move between the illumination area of each LED bulb.
What applications is it best for? Li-Fi is still a long way from widespread
commercialization, but it has potential applications for the Internet
of Things in many industries, including aerospace, education,
consumer electronics, healthcare, retail, security and transportation.
BLUETOOTH
What is it? A standard for the short-range wireless interconnection
of mobile phones, computers and other electronic devices.
How does it work? Bluetooth sends and receives radio waves in a
band of 79 different frequencies (channels) centered on 2.45 GHz, set
apart from radio, television and cellphones, and reserved for use by industrial, scientific and medical gadgets.
Bluetooth’s short-range transmitters have very low power consumption
and are more secure than wireless networks that operate
over longer ranges, such as Wi-Fi.
What applications is it best for? Bluetooth is a global 2.4 GHz
personal area network for short-range wireless communication.
Device-to-device file transfers, mobile credentials, wireless speakers
and wireless headsets are often enabled with Bluetooth.
ZIGBEE
What is it? ZigBee is a 2.4 GHz mesh local area network (LAN) protocol.
It was developed as an IEEE 802.15.4-based specification for a
suite of high-level communication protocols used to create personal
area networks with small, low-power digital radios.
How does it work? ZigBee devices transmit data over long distances
by passing it through a mesh network of intermediate devices
to reach more distant ones. ZigBee networks have a defined rate of
250 MBps and are secured by 128-bit symmetric encryption keys.
What applications is it best for? ZigBee is typically used in lowdata-
rate applications that require high scalability, long battery life,
and secure networking. It is simpler and less expensive than Bluetooth
or Wi-Fi and is commonly used for home, building and industrial
automation applications, such as controlled lighting and
thermostats, home energy monitors, smart metering, medical device
data collection, traffic management systems and other low-power,
low-bandwidth needs.
This article originally appeared in the July/August 2018 issue of Security Today.
About the Author
Andrew Jimenez is the vice president of technology at Anixter.