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lr-wpan: Add rx Sensitivity configuration support

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This commit is contained in:
Alberto Gallegos Ramonet
2022-10-27 12:58:47 +09:00
committed by Alberto Gallegos
parent 78b939e79f
commit 5d0948a7c7
13 changed files with 2453 additions and 3480 deletions
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1
CHANGES.md
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@@ -34,6 +34,7 @@ Changes from ns-3.37 to ns-3.38
* (lr-wpan) Remove the functions `LrWpanCsmaCa::GetUnitBackoffPeriod()` and `LrWpanCsmaCa::SetUnitBackoffPeriod()`, and move the constant `m_aUnitBackoffPeriod` to `src/lr-wpan/model/lr-wpan-constants.h`.
* (lr-wpan) Adds beacon payload handle support (MLME-SET.request) in **LrWpanMac**.
* (core) Now test-runner exits if no TestSuite is specified.
* (lr-wpan) Adds the possibility to modify the Rx sensitivity in **LrWpanPhy**.
### Changes to build system

1
RELEASE_NOTES.md
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@@ -31,6 +31,7 @@ Release 3-dev
- (wifi) Implement 802.11ax dual NAV (basic NAV and intra-BSS NAV)
- (wifi) Implement 802.11ax Uplink Multi-User Carrier Sense (UL MU CS) mechanism and have it used by non-AP STAs when determining if they can reply to a received Trigger Frame
- (wifi) Add support for 802.11ax MU-RTS/CTS protection
- (lr-wpan) !1006 - Add rx Sensitivity configuration support.
### Bugs fixed

3943
src/lr-wpan/doc/802-15-4-per-sens.eps
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src/lr-wpan/doc/802-15-4-psr-distance.eps
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%%EOF

44
src/lr-wpan/doc/lr-wpan.rst
View File

@@ -14,7 +14,6 @@ IEEE standard 802.15.4 (2003,2006,2011).
Model Description
*****************
The source code for the lr-wpan module lives in the directory ``src/lr-wpan``.
Design
======
@@ -214,16 +213,33 @@ Std 802.15.4-2006, appendix E, Figure E.2. Reception of the packet will finish
after the packet was completely transmitted. Other packets arriving during
reception will add up to the interference/noise.
Currently the receiver sensitivity is set to a fixed value of -106.58 dBm. This
corresponds to a packet error rate of 1% for 20 byte PSDU reference packets for this
signal power, according to IEEE Std 802.15.4-2006, section 6.1.7. In the future
we will provide support for changing the sensitivity to different values.
Rx sensitivity is defined as the weakest possible signal point at which a receiver can receive and decode a packet with a high success rate.
According to the standard (IEEE Std 802.15.4-2006, section 6.1.7), this
corresponds to the point where the packet error rate is under 1% for 20 bytes PSDU
reference packets (11 bytes MAC header + 7 bytes payload (MSDU) + FCS 2 bytes). Setting low Rx sensitivity values (increasing the radio hearing capabilities)
have the effect to receive more packets (and at a greater distance) but it raises the probability to have dropped packets at the
MAC layer or the probability of corrupted packets. By default, the receiver sensitivity is set to the maximum theoretical possible value of -106.58 dBm for the supported IEEE 802.15.4 O-QPSK 250kps.
This rx sensitivity is set for the "perfect radio" which only considers the floor noise, in essence, this do not include the noise factor (noise introduced by imperfections in the demodulator chip or external factors).
The receiver sensitivity can be changed to different values using ``SetRxSensitivity`` function in the PHY to simulate the hearing capabilities of different compliant radio transceivers (the standard minimum compliant Rx sensitivity is -85 dBm).:::
(defined by the standard)
NoiseFloor Max Sensitivity Min Sensitivity
-106.987dBm -106.58dBm -85dBm
|-------------------------|------------------------------------------|
Noise Factor = 1
| <--------------------------------------->|
Acceptable sensitivity range
The example ``lr-wpan-per-plot.cc` shows that at given Rx sensitiviy, packets are dropped regardless of their theoretical error probability.
This program outputs a file named ``802.15.4-per-vs-rxSignal.plt``.
Loading this file into gnuplot yields a file ``802.15.4-per-vs-rsSignal.eps``, which can
be converted to pdf or other formats. Packet payload size, Tx power and Rx sensitivity can be configurated.
The point where the blue line crosses with the PER indicates the Rx sensitivity. The default output is shown below.
.. _fig-802-15-4-per-sens:
.. figure:: figures/802-15-4-per-sens.*
Packet error rate vs. signal power
Default output of the program ``lr-wpan-per-plot.cc``
NetDevice
@@ -298,7 +314,7 @@ running on both, slotted and unslotted mode (CSMA/CA) of 802.15.4 operation for
- Devices are capable of associating with a single PAN coordinator. Interference is modeled as AWGN but this is currently not thoroughly tested.
- The standard describes the support of multiple PHY band-modulations but currently, only 250kbps O-QPSK (channel page 0) is supported.
- Active and passive MAC scans are able to obtain a LQI value from a beacon frame, however, the scan primitives assumes LQI is correctly implemented and does not check the validity of its value.
- Configuration of Rx Sensitivity and ED thresholds are currently not supported.
- Configuration of the ED thresholds are currently not supported.
- Orphan scans are not supported.
- Disassociation primitives are not supported.
- Security is not supported.
@@ -338,6 +354,7 @@ The following examples have been written, which can be found in ``src/lr-wpan/ex
* ``lr-wpan-data.cc``: A simple example showing end-to-end data transfer.
* ``lr-wpan-error-distance-plot.cc``: An example to plot variations of the packet success ratio as a function of distance.
* ``lr-wpan-per-plot.cc``: An example to plot the theoretical and experimental packet error rate (PER) as a function of receive signal.
* ``lr-wpan-error-model-plot.cc``: An example to test the phy.
* ``lr-wpan-packet-print.cc``: An example to print out the MAC header fields.
* ``lr-wpan-phy-test.cc``: An example to test the phy.
@@ -364,11 +381,14 @@ in a DataIndication on the peer node.
The example ``lr-wpan-error-distance-plot.cc`` plots the packet success
ratio (PSR) as a function of distance, using the default LogDistance
propagation loss model and the 802.15.4 error model. The channel (default 11),
packet size (default 20 bytes) and transmit power (default 0 dBm) can be
varied by command line arguments. The program outputs a file named
``802.15.4-psr-distance.plt``. Loading this file into gnuplot yields
a file ``802.15.4-psr-distance.eps``, which can be converted to pdf or
other formats. The default output is shown below.
packet size (default PSDU 20 bytes = 11 bytes MAC header + data payload), transmit power (default 0 dBm)
and Rx sensitivity (default -106.58 dBm) can be varied by command line arguments.
The program outputs a file named ``802.15.4-psr-distance.plt``.
Loading this file into gnuplot yields a file ``802.15.4-psr-distance.eps``, which can
be converted to pdf or other formats. The following image shows the output
of multiple runs using different Rx sensitivity values. A higher Rx sensitivity (lower dBm) results
in a increased communication distance but also makes the radio suceptible to more interference from
surronding devices.
.. _fig-802-15-4-psr-distance:

7
src/lr-wpan/examples/CMakeLists.txt
View File

@@ -38,3 +38,10 @@ build_lib_example(
LIBRARIES_TO_LINK ${liblr-wpan}
${libnetanim}
)
build_lib_example(
NAME lr-wpan-per-plot
SOURCE_FILES lr-wpan-per-plot.cc
LIBRARIES_TO_LINK ${liblr-wpan}
${libstats}
)

57
src/lr-wpan/examples/lr-wpan-error-distance-plot.cc
View File

@@ -17,11 +17,25 @@
* Author: Tom Henderson <thomas.r.henderson@boeing.com>
*/
// This program produces a gnuplot file that plots the packet success rate
// as a function of distance for the 802.15.4 models, assuming a default
// LogDistance propagation loss model, the 2.4 GHz OQPSK error model, a
// default transmit power of 0 dBm, and a default packet size of 20 bytes of
// 802.15.4 payload.
/*
This program produces a gnuplot file that plots the packet success rate
as a function of distance for the 802.15.4 models, assuming a default
LogDistance propagation loss model, the 2.4 GHz OQPSK error model, a
default transmit power of 0 dBm, and a default packet size of 20 bytes of
802.15.4 payload and a default rx sensitivity of -106.58 dBm.
Tx power of the transmitter node and the Rx sensitivity of the receiving node
as well as the transmitted packet size can be adjusted to obtain a different
distance plot.
Node1 Node2
(dev0) --------------------->(dev1)
Usage:
./ns3 run "lr-wpan-error-distance-plot --txPower= 0 --rxSensitivity=-92"
*/
#include <ns3/abort.h>
#include <ns3/callback.h>
#include <ns3/command-line.h>
@@ -52,7 +66,7 @@
using namespace ns3;
static uint32_t g_received = 0; //!< number of packets received
uint32_t g_packetsReceived = 0; //!< number of packets received
NS_LOG_COMPONENT_DEFINE("LrWpanErrorDistancePlot");
@@ -61,10 +75,10 @@ NS_LOG_COMPONENT_DEFINE("LrWpanErrorDistancePlot");
* \param params MCPS data indication parameters
* \param p packet
*/
static void
void
LrWpanErrorDistanceCallback(McpsDataIndicationParams params, Ptr<Packet> p)
{
g_received++;
g_packetsReceived++;
}
int
@@ -77,20 +91,22 @@ main(int argc, char* argv[])
int maxDistance = 200; // meters
int increment = 1;
int maxPackets = 1000;
int packetSize = 20;
int packetSize = 7; // PSDU = 20 bytes (11 bytes MAC header + 7 bytes MSDU )
double txPower = 0;
uint32_t channelNumber = 11;
double rxSensitivity = -106.58; // dBm
CommandLine cmd(__FILE__);
cmd.AddValue("txPower", "transmit power (dBm)", txPower);
cmd.AddValue("packetSize", "packet (MSDU) size (bytes)", packetSize);
cmd.AddValue("channelNumber", "channel number", channelNumber);
cmd.AddValue("rxSensitivity", "the rx sensitivity (dBm)", rxSensitivity);
cmd.Parse(argc, argv);
os << "Packet (MSDU) size = " << packetSize << " bytes; tx power = " << txPower
<< " dBm; channel = " << channelNumber;
<< " dBm; channel = " << channelNumber << "; Rx sensitivity = " << rxSensitivity << " dBm";
Gnuplot psrplot = Gnuplot("802.15.4-psr-distance.eps");
Gnuplot2dDataset psrdataset("802.15.4-psr-vs-distance");
@@ -117,6 +133,9 @@ main(int argc, char* argv[])
Ptr<SpectrumValue> psd = svh.CreateTxPowerSpectralDensity(txPower, channelNumber);
dev0->GetPhy()->SetTxPowerSpectralDensity(psd);
// Set Rx sensitivity of the receiving device
dev1->GetPhy()->SetRxSensitivity(rxSensitivity);
McpsDataIndicationCallback cb0;
cb0 = MakeCallback(&LrWpanErrorDistanceCallback);
dev1->GetMac()->SetMcpsDataIndicationCallback(cb0);
@@ -132,7 +151,7 @@ main(int argc, char* argv[])
Ptr<Packet> p;
mob0->SetPosition(Vector(0, 0, 0));
mob1->SetPosition(Vector(minDistance, 0, 0));
for (int j = minDistance; j < maxDistance;)
for (int j = minDistance; j < maxDistance; j += increment)
{
for (int i = 0; i < maxPackets; i++)
{
@@ -140,10 +159,10 @@ main(int argc, char* argv[])
Simulator::Schedule(Seconds(i), &LrWpanMac::McpsDataRequest, dev0->GetMac(), params, p);
}
Simulator::Run();
NS_LOG_DEBUG("Received " << g_received << " packets for distance " << j);
psrdataset.Add(j, g_received / 1000.0);
g_received = 0;
j += increment;
NS_LOG_DEBUG("Received " << g_packetsReceived << " packets for distance " << j);
psrdataset.Add(j, g_packetsReceived / 1000.0);
g_packetsReceived = 0;
mob1->SetPosition(Vector(j, 0, 0));
}
@@ -153,10 +172,10 @@ main(int argc, char* argv[])
psrplot.SetTerminal("postscript eps color enh \"Times-BoldItalic\"");
psrplot.SetLegend("distance (m)", "Packet Success Rate (PSR)");
psrplot.SetExtra("set xrange [0:200]\n\
set yrange [0:1]\n\
set grid\n\
set style line 1 linewidth 5\n\
set style increment user");
set yrange [0:1]\n\
set grid\n\
set style line 1 linewidth 5\n\
set style increment user");
psrplot.GenerateOutput(berfile);
berfile.close();

251
src/lr-wpan/examples/lr-wpan-per-plot.cc Normal file
View File

@@ -0,0 +1,251 @@
/*
* Copyright (c) 2022 Tokushima University, Japan
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation;
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Authors: Alberto Gallegos Ramonet <alramonet@is.tokushima-u.ac.jp>
* Tommaso Pecorella <tommaso.pecorella@unifi.it>
*/
/*
This program produces a gnuplot file that plots the theoretical and experimental packet error
rate (PER) as a function of receive signal for the 802.15.4 model. As described by the standard,
the PER is calculated with the transmission of frames with a PSDU of 20 bytes. This is equivalent
to an MPDU = MAC header (11 bytes) + FCS (2 bytes) + payload (MSDU 7 bytes). In the experimental
test, 1000 frames are transmitted for each Rx signal ranging from -130 dBm to -100 dBm with
increments of 0.01 dBm. The point before PER is < 1 % is the device receive sensitivity.
Theoretical and experimental Rx sensitivity is printed at the end of the end and a plot is
generated.
Example usage:
./ns3 run "lr-wpan-per-plot --rxSensitivity=-92"
*/
#include <ns3/core-module.h>
#include <ns3/gnuplot.h>
#include <ns3/lr-wpan-module.h>
#include <ns3/mobility-module.h>
#include <ns3/network-module.h>
#include <ns3/propagation-module.h>
#include <ns3/spectrum-module.h>
using namespace ns3;
uint32_t g_packetsReceived = 0; //!< number of packets received
NS_LOG_COMPONENT_DEFINE("LrWpanErrorDistancePlot");
/**
* Function called when a Data indication is invoked
* \param params MCPS data indication parameters
* \param p packet
*/
void
PacketReceivedCallback(McpsDataIndicationParams params, Ptr<Packet> p)
{
g_packetsReceived++;
}
int
main(int argc, char* argv[])
{
LogComponentEnableAll(LogLevel(LOG_PREFIX_FUNC | LOG_PREFIX_NODE | LOG_PREFIX_TIME));
std::ostringstream os;
std::ofstream perfile("802.15.4-per-vs-rxSignal.plt");
double minRxSignal = -111; // dBm
double maxRxSignal = -82; // dBm
double increment = 0.01;
int maxPackets = 1000;
int packetSize = 7; // bytes (MPDU payload)
double txPower = 0; // dBm
uint32_t channelNumber = 11;
double rxSensitivity = -106.58; // dBm
CommandLine cmd(__FILE__);
cmd.AddValue("txPower", "transmit power (dBm)", txPower);
cmd.AddValue("packetSize", "packet (MSDU) size (bytes)", packetSize);
cmd.AddValue("channelNumber", "channel number", channelNumber);
cmd.AddValue("rxSensitivity", "the rx sensitivity (dBm)", rxSensitivity);
cmd.Parse(argc, argv);
Gnuplot perplot = Gnuplot("802.15.4-per-vs-rxSignal.eps");
Gnuplot2dDataset perdatasetExperimental("Experimental");
Gnuplot2dDataset perdatasetTheorical("Theoretical");
Ptr<Node> n0 = CreateObject<Node>();
Ptr<Node> n1 = CreateObject<Node>();
Ptr<LrWpanNetDevice> dev0 = CreateObject<LrWpanNetDevice>();
Ptr<LrWpanNetDevice> dev1 = CreateObject<LrWpanNetDevice>();
dev0->SetAddress(Mac16Address("00:01"));
dev1->SetAddress(Mac16Address("00:02"));
Ptr<SingleModelSpectrumChannel> channel = CreateObject<SingleModelSpectrumChannel>();
Ptr<FixedRssLossModel> propModel = CreateObject<FixedRssLossModel>();
channel->AddPropagationLossModel(propModel);
dev0->SetChannel(channel);
dev1->SetChannel(channel);
n0->AddDevice(dev0);
n1->AddDevice(dev1);
Ptr<ConstantPositionMobilityModel> mob0 = CreateObject<ConstantPositionMobilityModel>();
dev0->GetPhy()->SetMobility(mob0);
Ptr<ConstantPositionMobilityModel> mob1 = CreateObject<ConstantPositionMobilityModel>();
dev1->GetPhy()->SetMobility(mob1);
mob0->SetPosition(Vector(0, 0, 0));
mob1->SetPosition(Vector(0, 0, 0));
LrWpanSpectrumValueHelper svh;
Ptr<SpectrumValue> psd = svh.CreateTxPowerSpectralDensity(txPower, channelNumber);
dev0->GetPhy()->SetTxPowerSpectralDensity(psd);
// Set Rx sensitivity of the receiving device
dev1->GetPhy()->SetRxSensitivity(rxSensitivity);
McpsDataIndicationCallback cb0;
cb0 = MakeCallback(&PacketReceivedCallback);
dev1->GetMac()->SetMcpsDataIndicationCallback(cb0);
//////////////////////////////////
// Experimental PER v.s Signal //
//////////////////////////////////
double per = 1;
double sensitivityExp = 0;
bool sensThreshold = true;
for (double j = minRxSignal; j < maxRxSignal; j += increment)
{
propModel->SetRss(j);
if (sensThreshold)
{
sensitivityExp = j;
}
for (int i = 0; i < maxPackets; i++)
{
McpsDataRequestParams params;
params.m_srcAddrMode = SHORT_ADDR;
params.m_dstAddrMode = SHORT_ADDR;
params.m_dstPanId = 0;
params.m_dstAddr = Mac16Address("00:02");
params.m_msduHandle = 0;
params.m_txOptions = 0;
Ptr<Packet> p;
p = Create<Packet>(packetSize);
Simulator::Schedule(Seconds(i), &LrWpanMac::McpsDataRequest, dev0->GetMac(), params, p);
}
Simulator::Run();
per = (static_cast<double>(maxPackets - g_packetsReceived) / maxPackets) * 100;
std::cout << "Experimental Test || Signal: " << j << " dBm | Received " << g_packetsReceived
<< " pkts"
<< "/" << maxPackets << " | PER " << per << " %\n";
if (per <= 1 && sensThreshold)
{
sensThreshold = false;
}
perdatasetExperimental.Add(j, per);
g_packetsReceived = 0;
}
/////////////////////////////////
// Theoretical PER v.s. Signal //
/////////////////////////////////
Ptr<LrWpanErrorModel> lrWpanError = CreateObject<LrWpanErrorModel>();
LrWpanSpectrumValueHelper psdHelper;
// Calculate the noise that accounts for both thermal noise (floor noise) and
// imperfections on the chip or lost before reaching the demodulator.
// In O-QPSK 250kbps, the point where PER is <= 1% without
// additional noise is -106.58 dBm (Noise Factor = 1)
double maxRxSensitivityW = (pow(10.0, -106.58 / 10.0) / 1000.0);
long double noiseFactor = (pow(10.0, rxSensitivity / 10.0) / 1000.0) / maxRxSensitivityW;
psdHelper.SetNoiseFactor(noiseFactor);
Ptr<const SpectrumValue> noisePsd = psdHelper.CreateNoisePowerSpectralDensity(11);
double noise = LrWpanSpectrumValueHelper::TotalAvgPower(noisePsd, 11);
double signal = 0;
double sensitivityTheo = 0;
double perTheoretical = 0;
double snr = 0;
sensThreshold = true;
for (double j = minRxSignal; j < maxRxSignal; j += increment)
{
if (sensThreshold)
{
sensitivityTheo = j;
}
signal = pow(10.0, j / 10.0) / 1000.0; // signal in Watts
snr = signal / noise;
// According to the standard, Packet error rate should be obtained
// using a PSDU of 20 bytes using
// the equation PER = 1 - (1 - BER)^nbits
perTheoretical = (1.0 - lrWpanError->GetChunkSuccessRate(snr, (packetSize + 13) * 8)) * 100;
std::cout << "Theoretical Test || Signal: " << j << " dBm | SNR: " << snr << "| PER "
<< perTheoretical << " % \n";
if (perTheoretical <= 1 && sensThreshold)
{
sensThreshold = false;
}
perdatasetTheorical.Add(j, perTheoretical);
}
std::cout << "_____________________________________________________________________________\n";
std::cout << "Experimental Test || Receiving with a current sensitivity of " << sensitivityExp
<< " dBm\n";
std::cout << "Theoretical Test || Receiving with a current sensitivity of " << sensitivityTheo
<< " dBm\n";
std::cout << "Gnu plot generated.";
os << "Pkt Payload (MSDU) size = " << packetSize << " bytes | "
<< "Tx power = " << txPower << " dBm | "
<< "Rx Sensitivity (Theo) = " << sensitivityTheo << " dBm";
perplot.AddDataset(perdatasetExperimental);
perplot.AddDataset(perdatasetTheorical);
perplot.SetTitle(os.str());
perplot.SetTerminal("postscript eps color enh \"Times-BoldItalic\"");
perplot.SetLegend("Rx signal (dBm)", "Packet Error Rate (%)");
perplot.SetExtra("set xrange [-110:-82]\n\
set logscale y\n\
set yrange [0.000000000001:120]\n\
set xtics 2\n\
set grid\n\
set style line 1 linewidth 5\n\
set style line 2 linewidth 3\n\
set style increment user\n\
set arrow from -110,1 to -82,1 nohead lc 'web-blue' front");
perplot.GenerateOutput(perfile);
perfile.close();
Simulator::Destroy();
return 0;
}

91
src/lr-wpan/model/lr-wpan-phy.cc
View File

@@ -1166,14 +1166,10 @@ LrWpanPhy::PlmeSetAttributeRequest(LrWpanPibAttributeIdentifier id,
m_phyPIBAttributes.phyCurrentPage = attribute->phyCurrentPage;
LrWpanSpectrumValueHelper psdHelper;
m_txPsd = psdHelper.CreateTxPowerSpectralDensity(
GetNominalTxPowerFromPib(m_phyPIBAttributes.phyTransmitPower),
m_phyPIBAttributes.phyCurrentChannel);
// if the page is changed we need to also update the Noise Power Spectral Density
m_noise =
psdHelper.CreateNoisePowerSpectralDensity(m_phyPIBAttributes.phyCurrentChannel);
m_signal = Create<LrWpanInterferenceHelper>(m_noise->GetSpectrumModel());
// TODO: Set the maximum possible sensitivity by default.
// This maximum sensitivity depends on the modulation used.
// Currently Only O-QPSK 250kbps is supported so we use its max sensitivity.
SetRxSensitivity(-106.58);
}
break;
}
@@ -1216,14 +1212,8 @@ LrWpanPhy::PlmeSetAttributeRequest(LrWpanPibAttributeIdentifier id,
m_phyPIBAttributes.phyCurrentChannel = attribute->phyCurrentChannel;
LrWpanSpectrumValueHelper psdHelper;
m_txPsd = psdHelper.CreateTxPowerSpectralDensity(
GetNominalTxPowerFromPib(m_phyPIBAttributes.phyTransmitPower),
m_phyPIBAttributes.phyCurrentChannel);
// if the channel is changed we need to also update the Noise Power Spectral Density
m_noise =
psdHelper.CreateNoisePowerSpectralDensity(m_phyPIBAttributes.phyCurrentChannel);
m_signal = Create<LrWpanInterferenceHelper>(m_noise->GetSpectrumModel());
// use the prev configured sensitivity before changing the channel
SetRxSensitivity(WToDbm(m_rxSensitivity));
}
break;
}
@@ -1695,15 +1685,11 @@ LrWpanPhy::SetPhyOption(LrWpanPhyOption phyOption)
m_edPower.lastUpdate = Seconds(0.0);
m_edPower.measurementLength = Seconds(0.0);
// TODO: What is the RX sensibility that should be set for other frequencies?
// default -110 dBm in W for 2.4 GHz
m_rxSensitivity = pow(10.0, -106.58 / 10.0) / 1000.0;
LrWpanSpectrumValueHelper psdHelper;
m_txPsd = psdHelper.CreateTxPowerSpectralDensity(
GetNominalTxPowerFromPib(m_phyPIBAttributes.phyTransmitPower),
m_phyPIBAttributes.phyCurrentChannel);
m_noise = psdHelper.CreateNoisePowerSpectralDensity(m_phyPIBAttributes.phyCurrentChannel);
m_signal = Create<LrWpanInterferenceHelper>(m_noise->GetSpectrumModel());
// TODO: Change the limits Rx sensitivity when other modulations are supported
// Currently, only O-QPSK 250kbps is supported and its maximum possible sensitivity is
// equal to -106.58 dBm and its minimum sensitivity is defined as -85 dBm
SetRxSensitivity(-106.58);
m_rxLastUpdate = Seconds(0);
Ptr<Packet> none_packet = nullptr;
Ptr<LrWpanSpectrumSignalParameters> none_params = nullptr;
@@ -1712,6 +1698,61 @@ LrWpanPhy::SetPhyOption(LrWpanPhyOption phyOption)
m_errorModel = nullptr;
}
void
LrWpanPhy::SetRxSensitivity(double dbmSensitivity)
{
NS_LOG_FUNCTION(this << dbmSensitivity << "dBm");
// See IEEE 802.15.4-2011 Sections 10.3.4, 11.3.4, 13.3.4, 13.3.4, 14.3.4, 15.3.4
if (m_phyOption == IEEE_802_15_4_915MHZ_BPSK || m_phyOption == IEEE_802_15_4_950MHZ_BPSK)
{
if (dbmSensitivity > -92)
{
NS_ABORT_MSG("The minimum Rx sensitivity for this band should be at least -92 dBm");
}
}
else
{
if (dbmSensitivity > -85)
{
NS_ABORT_MSG("The minimum Rx sensitivity for this band should be at least -85 dBm");
}
}
// Calculate the noise factor required to reduce the Rx sensitivity.
// The maximum possible sensitivity in the current modulation is used as a reference
// to calculate the noise factor (F). The noise factor is a dimensionless ratio.
// Currently only one PHY modulation is supported:
// O-QPSK 250kpps which has a Max Rx sensitivity: -106.58 dBm (Noise factor = 1).
// After Rx sensitivity is set, this becomes the new point where PER < 1 % for a
// PSDU of 20 bytes as described by the standard.
// TODO: recalculate maxRxSensitivity (Noise factor = 1) when additional modulations are
// supported.
double maxRxSensitivityW = DbmToW(-106.58);
LrWpanSpectrumValueHelper psdHelper;
m_txPsd = psdHelper.CreateTxPowerSpectralDensity(
GetNominalTxPowerFromPib(m_phyPIBAttributes.phyTransmitPower),
m_phyPIBAttributes.phyCurrentChannel);
// Update thermal noise + noise factor added.
long double noiseFactor = DbmToW(dbmSensitivity) / maxRxSensitivityW;
psdHelper.SetNoiseFactor(noiseFactor);
m_noise = psdHelper.CreateNoisePowerSpectralDensity(m_phyPIBAttributes.phyCurrentChannel);
m_signal = Create<LrWpanInterferenceHelper>(m_noise->GetSpectrumModel());
// Change receiver sensitivity from dBm to Watts
m_rxSensitivity = DbmToW(dbmSensitivity);
}
double
LrWpanPhy::GetRxSensitivity()
{
NS_LOG_FUNCTION(this);
// Change receiver sensitivity from Watt to dBm
return WToDbm(m_rxSensitivity);
}
LrWpanPhyOption
LrWpanPhy::GetMyPhyOption()
{

26
src/lr-wpan/model/lr-wpan-phy.h
View File

@@ -316,6 +316,26 @@ class LrWpanPhy : public SpectrumPhy
*/
void SetPhyOption(LrWpanPhyOption phyOption);
/**
* Set the receiver power sensitivity used by this device in dBm.
*
* In ns-3 , rx sensitivity is only checked to be at least what is specified by
* the standard (-85dBm or -92dBm for BPSK bands). Most vendors provide better sensitivity
* options and exceed the minimum values proposed by the standard. Default sensitivity
* is -106.58 dBm (This does not include any noise figure).
* A sensitivity of -95dBm or less is considered by many vendors a high sensitivity.
*
* \param dbmSensitivity The receiver power sensitivity to set in dBm.
*/
void SetRxSensitivity(double dbmSensitivity);
/**
* Get the receiver power sensitivity used by this device in dBm.
*
* \return The receiver power sensitivity used by this device in dBm.
*/
double GetRxSensitivity();
/**
* Notify the SpectrumPhy instance of an incoming waveform.
*
@@ -723,10 +743,10 @@ class LrWpanPhy : public SpectrumPhy
int8_t GetNominalTxPowerFromPib(uint8_t phyTransmitPower);
/**
* Transform watts (W) to decibels milliwatts (DBm).
* Transform watts (W) to decibels milliwatts (dBm).
*
* \param watt The Watts that will be converted to DBm.
* \return The value of Watts in DBm.
* \param watt The Watts that will be converted to dBm.
* \return The value of Watts in dBm.
*/
double WToDbm(double watt);

6
src/lr-wpan/model/lr-wpan-spectrum-value-helper.cc
View File

@@ -126,6 +126,12 @@ LrWpanSpectrumValueHelper::CreateNoisePowerSpectralDensity(uint32_t channel)
return noisePsd;
}
void
LrWpanSpectrumValueHelper::SetNoiseFactor(double f)
{
m_noiseFactor = f;
}
double
LrWpanSpectrumValueHelper::TotalAvgPower(Ptr<const SpectrumValue> psd, uint32_t channel)
{

8
src/lr-wpan/model/lr-wpan-spectrum-value-helper.h
View File

@@ -52,6 +52,12 @@ class LrWpanSpectrumValueHelper
*/
Ptr<SpectrumValue> CreateNoisePowerSpectralDensity(uint32_t channel);
/**
* Set the noise factor added to the thermal noise.
* \param f A dimensionless ratio (i.e. Not in dB)
*/
void SetNoiseFactor(double f);
/**
* \brief total average power of the signal is the integral of the PSD using
* the limits of the given channel
@@ -64,6 +70,8 @@ class LrWpanSpectrumValueHelper
private:
/**
* A scaling factor for the noise power.
* It specifies how much additional noise the device
* contribute to the thermal noise (floor noise).
*/
double m_noiseFactor;
};