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Kategorie: Diplomové, bakalářské práce |
Tento dokument chci!
Tato práce zkoumá vhodnost a požadavky návrhu simulací pro simulátor NS-3 pro případ bezdrátových sítí používaných v měřící infrastruktuře společnosti Kamstrup. V práci jepopsán simulátor NS-3 a je vytvořena základní implementace dvou protokolů. WirelessM-Bus jako příklad jednosměrného protokolu pro zařízení napájené z baterií. Simulace Wireless M-Bus je porovnána s daty naměřenými v reálném systému. NS-3 poskytuje flexibilní prostředí pro vývoj simulací různých síťových protokolů, včetně těch určených pro sítě inteligentních měřidel.
1 Geographical Data
A geographical dataset with the positions the meters and repeaters and concen-
trators KML format was available.
3.
3. Library libkml [7] was used load the data.
The SINR calculated ratio the received desired signal power and the
sum all the other signals the given receiver and the configurable noise floor, in
linear values.
3. subclassing
the NS-3 class ErrorModel and defining packet error probability function of
SINR.
Additionally, was necessary convert the geographical coordinates (longitude
and latitude) Cartesian coordinates that could used the simulator and in
the propagation models general.the packet being decoded, also SwMac::ReceivePacket and SwMac::Receive-
PacketDone are called.g.5, would have missed the contribution
of Packet was shorter and ended before Packet 1.
SINRdB log10
Prx,desired
N Prx,other
, (3.
Among other information, they contained hourly values of: mean received signal
per given node, the variance that value and number successfully decoded
messages. The description mapping the geographical
coordinates Cartesian coordinates the Appendix D.
The implementation the Simple Wireless module checked the SINR only the
end the reception, so, terms Figure 3. The latter has indication success/failure that signals
packet drop the MAC layer.2)
for the power linear values the desired signal Prx,desired and all the other
signals the given device Prx,other.2 Measured Values
Measurements from the concentrators were available set SQLite databases.3 Deployment Data
The tools for loading the data are described Appendix B.
The realism the frame reception could improved using probabilistic
model for dropping packets instead the thresholding approach, e.
After pairing the measurements with the geographical data, was possible to
export the nodes’ distances and angles respect the concentrators and their
24
.3.3
