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8.4.2
EXMAs - WSNs vs. Existing Infrastructures
Here, we will mention some networking infrastructures, and discuss about the hier-
archy of WSNs and those infrastructures (Fig.
8.3
).
The face of networking today is very different from networking just a of couple
decades ago. Many new technologies have been developed and standardized. One
of the advantages of wireless sensor networks is its compatibility with these
technologies.
WSNs rely on existing infrastructures in order to provide real-time services.
Radio frequency identification (RFID) is low-power technology with number of
benefits. Today, RFID tags are widely used for device tracking, so they can be used
to keep track of sensor nodes.
Locating is an essential part in some projects based on WSNs, for example,
emergency response applications. Global Positioning System (GPS) can be identi-
fied as basic supporting technology in this area.
Data, collected by sensor nets, need to be transferred and presented in some way.
Choosing the Internet as representation portal seems like the most appropriate solu-
tion. This can be done over General Packet Radio Service (GPRS). Internet con-
nectivity can also be reached over wireless local area networks (WLANs/802.11).
Representation of the same data on mobile phones can be achieved via Bluetooth
technology.
We have introduced basic technologies that sensor networks rely on. Combining
of different frameworks leads to deployment of different appliances of sensor nets,
wireless personal area networks (WPANs), or wireless body area networks
(WBANs).
8.4.3
EXMAs - State of the Art
Different projects, based on WSNs, are being developed, worldwide. These projects
can mostly be referenced as academic researches, still finding their way into industry
Fig. 8.3
Hierarchy of WSNs and existing infrastructures
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