Khaldoun Al Agha, Marc-Henry Bertin,
Tuan Dang, Alexandre Guitton, Pascale Minet, Thietry Vsl, Jean-Baptiste Viollet
IEEE Transactions on Industrial
Electronics, Vol.56.NO 10, October 2009
Summary
The paper is issuing the importance of
wireless technology in industrial applications, with a good introduction of
what is the actual situation and problems in obtaining well enough
performances.
When setting up an industrial
wireless network, there are principally three aspect which must be paid certain
attention: the physical and Media Access Control layers (PHY and MAC),the
network layer and the application layer (APL).
In the first case
considered as necessary are: robust radio transmission, low power consumption,
compatibility with electromagnetic constraints, deterministic MACs.
In the second case
considered are: network topology flexibility, network scalability, transparency
for application layer (APL), energy aware routing protocol, support mobility,
support anti-intrusion.
For the last case required
are: support for application layers, support for application communication
modes, support for electronic device description language for diagnosis and
maintenance and support for authentication techniques. At the moment there are
several options for wireless networks for industrial applications, all of them
are based on IEEE 802.15.4, which still doesn’t keep into account an algorithm
for power consumption control. The paper proposes OCARI (Optimization of
Communication for Ad hoc Reliable Industrial networks) project, in which
satisfies several physical layers, such as deterministic MAC layer for
time-constrained communication, optimized energy-consumption routing strategy
for increasing network’s life time and support of human walking-speed mobility.
The OCARI network topology
is characterize by an industrial facility backbone to which a the workshop is
coordinated (providing direct connection to the rest of the factory and
internet connection as well); inside the workshop there are different cells,
each with its cell coordinator (using a star topology).
For more information the
reader can refer to the paper itself, what is important and has to underlined
it the importance paid for energy consumption.
Since at the end point of
the network there are devices carrying batteries, a strict relation with the
battery life is carried on, devices should be kept asleep when they are not
sending signals and should wake up on time when ready to receive signals.
Energy efficiency is
obtained therefore with topology control algorithms, algorithms for reducing
information transferred, energy efficient routing problem and scheduling node
activity algorithms.
The first version of OCARI
in 2009 still uses all nodes transmitting at maximum power, using or a
neighborhood discovery and a topology dissemination.
Key Concepts
Wireless Networks for
Industrial Applications
Key Results
In the overall OCARI seems
to be a well enough system, integrating all the systems at the moment on hand,
still some further improvement can be done in energy consumption.
It has been a technology
which took everything that was at the moment on hand and integrated there pros,
making is a successful network, still the paper hasn’t discussed about
environment issue in the factory.
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