Embedded micros in each vehicle will
analyze the data and provide
feedback to the driver. Even
automatic braking can be deployed in
close-call situations.
Then, there is vehicle-to-infrastructure (V2I) systems that let
vehicles communicate to nearby
roadside nodes in a network that can
supply traffic, weather, road
conditions, and other safety
information automatically. These
services will use a Wi-Fi type of
wireless technology called Dedicated
Short Range Communications (DSRC)
in the 5. 9 GHz band for
communications. The Department of
Transportation’s National Highway
Traffic Safety Administration (NHTSA)
believes that up to 80% of all
collisions could be avoided with such
systems. Look for them to become
standard on vehicles in the future.
WHAT WIRELESS WORKS
FOR M2M AND IOT?
Almost any short-range wireless
technology will work for M2M or Io T,
but some common ones are
emerging. For example, cellular
connections make up about 40% of
all M2M applications. A cellular
modem module like that in Figure 4
is embedded into the device to be
monitored. An accompanying
embedded microcontroller runs the
applications. Older 2G technology
like GSM and GPRS cellular can be
used, but with some carriers
planning to phase out the
older GSM 2G networks it
makes GSM and other older
methods a poor choice. Most
new systems will use the
faster 3G WCDMA and 4G
(LTE) cellular modems
despite the fact that most
M2M applications require mostly low
speed (<500 kbps) data rates. Most
of the major cellular carriers like
AT&T, Sprint, T-Mobile, and Verizon
offer M2M services.
Wi-Fi is another popular
connection technology. Since it is
available in millions of hot spots and
home networks everywhere, it is a
likely choice for Io T. Wi-Fi modules
are easy to build into most products.
GHz band will see Io T service unless
the application
demands speeds to 1