|
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.
4. (3. hour.4.
3. the minimum received power that results successful
packet reception.4.
3. The value taken realization zero-mean normally dis-
tributed random variable with configurable standard deviation, decibels, i.5)
26
.e.
3.2 Detection Threshold
Another configurable parameter the simulation, also used both cases, the sen-
sitivity the receiver, i.3 Results Comparison
Three types data were compared the measured path loss given the data
set was used reference, simulation results with measured path loss and with
simulated path loss were then compared with it, outlined Figure 3.6.1 Shadowing
A value modeling shadowing added for each transmission both cases when
using fixed path loss values from measurement and when estimating the path loss
using the model.e.
The simulation was set log the sent and received frames into SQLite database
in order estimate the simulated hit rate, which was chosen the parameter of
interest.g.
the linear value would log-normally distributed.
The key point interest was the packet hit rate value, which represents the
number packets from particular meter received given concentrator unit
of time, e. With known number packets sent, can represented
as percentage indicating the success rate packet delivery:
rhit% =
Nreceived
Nsent
. The packet hit results were the
most similar the measured ones when the standard deviation this variable was
3 dB.
The value giving the best results was -100 dBm.4 Simulation
Two types simulation were run: one using the average path loss values from the
measurements fixed path loss between the given meters and respective concen-
trators, and one using the log-distance propagation model calculate the path loss.3
