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bug 1924 - sensing radius and CCA

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This commit is contained in:
Sascha Jopen
2014-06-12 12:35:32 -07:00
parent eac8c0a104
commit 5a00199a04
4 changed files with 270 additions and 3 deletions
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5
src/lr-wpan/model/lr-wpan-phy.cc
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@@ -293,6 +293,7 @@ LrWpanPhy::StartRx (Ptr<SpectrumSignalParameters> spectrumRxParams)
// Add any incoming packet to the current interference before checking the
// SINR.
NS_LOG_DEBUG (this << " receiving packet with power: " << 10 * log10(LrWpanSpectrumValueHelper::TotalAvgPower (lrWpanRxParams->psd)) + 30 << "dBm");
m_signal->AddSignal (lrWpanRxParams->psd);
Ptr<SpectrumValue> interferenceAndNoise = m_signal->GetSignalPsd ();
*interferenceAndNoise -= *lrWpanRxParams->psd;
@@ -1075,7 +1076,7 @@ LrWpanPhy::EndCca (void)
else if (m_phyPIBAttributes.phyCCAMode == 1)
{ //sec 6.9.9 ED detection
// -- ED threshold at most 10 dB above receiver sensitivity.
if (m_ccaPeakPower / m_rxSensitivity >= 10.0)
if (10 * log10 (m_ccaPeakPower / m_rxSensitivity) >= 10.0)
{
sensedChannelState = IEEE_802_15_4_PHY_BUSY;
}
@@ -1103,7 +1104,7 @@ LrWpanPhy::EndCca (void)
}
else if (m_phyPIBAttributes.phyCCAMode == 3)
{ //sect 6.9.9 both
if ((m_ccaPeakPower / m_rxSensitivity >= 10.0)
if ((10 * log10 (m_ccaPeakPower / m_rxSensitivity) >= 10.0)
&& m_trxState == IEEE_802_15_4_PHY_BUSY_RX)
{
// Again, this code will never be reached, if we are already receiving

2
src/lr-wpan/model/lr-wpan-spectrum-value-helper.cc
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@@ -69,7 +69,7 @@ LrWpanSpectrumValueHelper::CreateTxPowerSpectralDensity (double txPower, uint32_
NS_LOG_FUNCTION (this);
Ptr<SpectrumValue> txPsd = Create <SpectrumValue> (g_LrWpanSpectrumModel);
// txPower is expressed in dBm. We must convert it into natural unit.
// txPower is expressed in dBm. We must convert it into natural unit (W).
txPower = pow (10., (txPower - 30) / 10);
// The effective occupied bandwidth of the signal is modelled to be 2 MHz.

265
src/lr-wpan/test/lr-wpan-cca-test.cc Normal file
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@@ -0,0 +1,265 @@
/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2014 Fraunhofer FKIE
*
* 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
*
* Author:
* Sascha Alexander Jopen <jopen@cs.uni-bonn.de>
*/
#include <ns3/log.h>
#include <ns3/core-module.h>
#include <ns3/lr-wpan-module.h>
#include <ns3/propagation-loss-model.h>
#include <ns3/propagation-delay-model.h>
#include <ns3/simulator.h>
#include <ns3/single-model-spectrum-channel.h>
#include <ns3/constant-position-mobility-model.h>
#include <ns3/packet.h>
#include "ns3/rng-seed-manager.h"
#include <iostream>
#include <iomanip>
using namespace ns3;
NS_LOG_COMPONENT_DEFINE ("lr-wpan-clear-channel-assessment-test");
using namespace ns3;
class LrWpanCcaTestCase : public TestCase
{
public:
LrWpanCcaTestCase ();
private:
static void PlmeCcaConfirm (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, LrWpanPhyEnumeration status);
static void PhyTxBegin (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet);
static void PhyTxEnd (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet);
static void PhyRxBegin (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet);
static void PhyRxEnd (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet, double sinr);
static void PhyRxDrop (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet);
virtual void DoRun (void);
LrWpanPhyEnumeration m_status;
};
LrWpanCcaTestCase::LrWpanCcaTestCase ()
: TestCase ("Test the 802.15.4 clear channel assessment")
{
m_status = IEEE_802_15_4_PHY_UNSPECIFIED;
}
void
LrWpanCcaTestCase::PlmeCcaConfirm (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, LrWpanPhyEnumeration status)
{
std::cout << std::setiosflags (std::ios::fixed) << std::setprecision (9) << "[" << Simulator::Now ().GetSeconds () << "] " << device->GetMac ()->GetShortAddress () << " PlmeCcaConfirm: " << LrWpanHelper::LrWpanPhyEnumerationPrinter (status) << std::endl;
testcase->m_status = status;
}
void
LrWpanCcaTestCase::PhyTxBegin (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet)
{
std::ostringstream os;
packet->Print (os);
std::cout << std::setiosflags (std::ios::fixed) << std::setprecision (9) << "[" << Simulator::Now ().GetSeconds () << "] " << device->GetMac ()->GetShortAddress () << " PhyTxBegin: " << os.str () << std::endl;
}
void
LrWpanCcaTestCase::PhyTxEnd (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet)
{
std::ostringstream os;
packet->Print (os);
std::cout << std::setiosflags (std::ios::fixed) << std::setprecision (9) << "[" << Simulator::Now ().GetSeconds () << "] " << device->GetMac ()->GetShortAddress () << " PhyTxEnd: " << os.str () << std::endl;
}
void
LrWpanCcaTestCase::PhyRxBegin (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet)
{
std::ostringstream os;
packet->Print (os);
std::cout << std::setiosflags (std::ios::fixed) << std::setprecision (9) << "[" << Simulator::Now ().GetSeconds () << "] " << device->GetMac ()->GetShortAddress () << " PhyRxBegin: " << os.str () << std::endl;
}
void
LrWpanCcaTestCase::PhyRxEnd (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet, double sinr)
{
std::ostringstream os;
packet->Print (os);
std::cout << std::setiosflags (std::ios::fixed) << std::setprecision (9) << "[" << Simulator::Now ().GetSeconds () << "] " << device->GetMac ()->GetShortAddress () << " PhyRxEnd (" << sinr << "): " << os.str () << std::endl;
// The first packet was received. Now start a CCA, to try to detect the second packet which is still being transmitted.
device->GetPhy ()->PlmeCcaRequest ();
}
void LrWpanCcaTestCase::PhyRxDrop (LrWpanCcaTestCase *testcase, Ptr<LrWpanNetDevice> device, Ptr<const Packet> packet)
{
std::ostringstream os;
packet->Print (os);
std::cout << std::setiosflags (std::ios::fixed) << std::setprecision (9) << "[" << Simulator::Now ().GetSeconds () << "] " << device->GetMac ()->GetShortAddress () << " PhyRxDrop: " << os.str () << std::endl;
}
void
LrWpanCcaTestCase::DoRun (void)
{
// Tx Power: 0 dBm
// Receiver Sensitivity: -106.58 dBm
// CCA channel busy condition: Rx power > -96.58 dBm
// Log distance reference loss at 1 m distance for channel 11 (2405 MHz): 40.0641 dB
// Log distance free space path loss exponent: 2
// Test setup:
// Start transmission of a short packet from node 0 to node 1 and at the same
// time a transmission of a large packet from node 2 to node 1.
// Both transmissions should start without backoff (per configuration) because
// the CCA on both nodes should detect a free medium.
// The shorter packet will be received first. After reception of the short
// packet, which might be destroyed due to interference of the large
// packet, node 1 will start a CCA. Depending on the distance between node 1
// and node 2, node 1 should detect a busy medium, because the transmission of
// the large packet is still in progress. For the above mentioned scenario
// parameters, the distance for the CCA detecting a busy medium is about
// 669.5685 m.
// Enable calculation of FCS in the trailers. Only necessary when interacting with real devices or wireshark.
// GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));
// Set the random seed and run number for this test
RngSeedManager::SetSeed (1);
RngSeedManager::SetRun (6);
// Create 3 nodes, and a NetDevice for each one
Ptr<Node> n0 = CreateObject <Node> ();
Ptr<Node> n1 = CreateObject <Node> ();
Ptr<Node> n2 = CreateObject <Node> ();
Ptr<LrWpanNetDevice> dev0 = CreateObject<LrWpanNetDevice> ();
Ptr<LrWpanNetDevice> dev1 = CreateObject<LrWpanNetDevice> ();
Ptr<LrWpanNetDevice> dev2 = CreateObject<LrWpanNetDevice> ();
// Make random variable stream assignment deterministic
dev0->AssignStreams (0);
dev1->AssignStreams (10);
dev2->AssignStreams (20);
dev0->SetAddress (Mac16Address ("00:01"));
dev1->SetAddress (Mac16Address ("00:02"));
dev2->SetAddress (Mac16Address ("00:03"));
// Each device must be attached to the same channel
Ptr<SingleModelSpectrumChannel> channel = CreateObject<SingleModelSpectrumChannel> ();
Ptr<LogDistancePropagationLossModel> propModel = CreateObject<LogDistancePropagationLossModel> ();
propModel->SetReference (1.0, 40.0641); // Reference loss at 1m distance for 2405 MHz (channel 11)
propModel->SetPathLossExponent (2); // Free space path loss exponent
Ptr<ConstantSpeedPropagationDelayModel> delayModel = CreateObject<ConstantSpeedPropagationDelayModel> ();
channel->AddPropagationLossModel (propModel);
channel->SetPropagationDelayModel (delayModel);
dev0->SetChannel (channel);
dev1->SetChannel (channel);
dev2->SetChannel (channel);
// To complete configuration, a LrWpanNetDevice must be added to a node
n0->AddDevice (dev0);
n1->AddDevice (dev1);
n2->AddDevice (dev2);
Ptr<ConstantPositionMobilityModel> sender0Mobility = CreateObject<ConstantPositionMobilityModel> ();
sender0Mobility->SetPosition (Vector (0, 0, 0));
dev0->GetPhy ()->SetMobility (sender0Mobility);
Ptr<ConstantPositionMobilityModel> sender1Mobility = CreateObject<ConstantPositionMobilityModel> ();
sender1Mobility->SetPosition (Vector (0, 669, 0));
dev1->GetPhy ()->SetMobility (sender1Mobility);
Ptr<ConstantPositionMobilityModel> sender2Mobility = CreateObject<ConstantPositionMobilityModel> ();
sender2Mobility->SetPosition (Vector (0, 1338, 0));
dev2->GetPhy ()->SetMobility (sender2Mobility);
// Disable the NetDevices queue management.
dev0->GetMac ()->SetMcpsDataConfirmCallback (MakeNullCallback<void, McpsDataConfirmParams> ());
dev1->GetMac ()->SetMcpsDataConfirmCallback (MakeNullCallback<void, McpsDataConfirmParams> ());
dev2->GetMac ()->SetMcpsDataConfirmCallback (MakeNullCallback<void, McpsDataConfirmParams> ());
// Set the CCA confirm callback.
dev1->GetPhy ()->SetPlmeCcaConfirmCallback (MakeBoundCallback (&LrWpanCcaTestCase::PlmeCcaConfirm, this, dev1));
// Start sending without backoff, if the channel is free.
dev0->GetCsmaCa ()->SetMacMinBE (0);
dev2->GetCsmaCa ()->SetMacMinBE (0);
// Connect trace sources.
dev0->GetPhy ()->TraceConnectWithoutContext ("PhyTxBegin", MakeBoundCallback (&LrWpanCcaTestCase::PhyTxBegin, this, dev0));
dev0->GetPhy ()->TraceConnectWithoutContext ("PhyTxEnd", MakeBoundCallback (&LrWpanCcaTestCase::PhyTxEnd, this, dev0));
dev2->GetPhy ()->TraceConnectWithoutContext ("PhyTxBegin", MakeBoundCallback (&LrWpanCcaTestCase::PhyTxBegin, this, dev2));
dev2->GetPhy ()->TraceConnectWithoutContext ("PhyTxEnd", MakeBoundCallback (&LrWpanCcaTestCase::PhyTxEnd, this, dev2));
dev1->GetPhy ()->TraceConnectWithoutContext ("PhyRxBegin", MakeBoundCallback (&LrWpanCcaTestCase::PhyRxBegin, this, dev1));
dev1->GetPhy ()->TraceConnectWithoutContext ("PhyRxEnd", MakeBoundCallback (&LrWpanCcaTestCase::PhyRxEnd, this, dev1));
dev1->GetPhy ()->TraceConnectWithoutContext ("PhyRxDrop", MakeBoundCallback (&LrWpanCcaTestCase::PhyRxDrop, this, dev1));
m_status = IEEE_802_15_4_PHY_UNSPECIFIED;
Ptr<Packet> p0 = Create<Packet> (1); // 1 byte of dummy data
McpsDataRequestParams params0;
params0.m_srcAddrMode = SHORT_ADDR;
params0.m_dstAddrMode = SHORT_ADDR;
params0.m_dstPanId = 0;
params0.m_dstAddr = Mac16Address ("00:02");
params0.m_msduHandle = 0;
params0.m_txOptions = TX_OPTION_NONE;
Simulator::ScheduleNow (&LrWpanMac::McpsDataRequest, dev0->GetMac (), params0, p0);
Ptr<Packet> p1 = Create<Packet> (100); // 100 bytes of dummy data
McpsDataRequestParams params1;
params1.m_srcAddrMode = SHORT_ADDR;
params1.m_dstAddrMode = SHORT_ADDR;
params1.m_dstPanId = 0;
params1.m_dstAddr = Mac16Address ("00:02");
params1.m_msduHandle = 0;
params1.m_txOptions = TX_OPTION_NONE;
Simulator::ScheduleNow (&LrWpanMac::McpsDataRequest, dev2->GetMac (), params1, p1);
Simulator::Run ();
NS_TEST_EXPECT_MSG_EQ (m_status, IEEE_802_15_4_PHY_BUSY, "CCA status BUSY (as expected)");
m_status = IEEE_802_15_4_PHY_UNSPECIFIED;
sender2Mobility->SetPosition (Vector (0, 1340, 0));
Simulator::ScheduleNow (&LrWpanMac::McpsDataRequest, dev0->GetMac (), params0, p0);
Simulator::ScheduleNow (&LrWpanMac::McpsDataRequest, dev2->GetMac (), params1, p1);
Simulator::Run ();
NS_TEST_EXPECT_MSG_EQ (m_status, IEEE_802_15_4_PHY_IDLE, "CCA status IDLE (as expected)");
Simulator::Destroy ();
}
class LrWpanCcaTestSuite : public TestSuite
{
public:
LrWpanCcaTestSuite ();
};
LrWpanCcaTestSuite::LrWpanCcaTestSuite ()
: TestSuite ("lr-wpan-clear-channel-assessment", UNIT)
{
AddTestCase (new LrWpanCcaTestCase, TestCase::QUICK);
}
static LrWpanCcaTestSuite g_lrWpanCcaTestSuite;

1
src/lr-wpan/wscript
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@@ -20,6 +20,7 @@ def build(bld):
module_test = bld.create_ns3_module_test_library('lr-wpan')
module_test.source = [
'test/lr-wpan-ack-test.cc',
'test/lr-wpan-cca-test.cc',
'test/lr-wpan-collision-test.cc',
'test/lr-wpan-ed-test.cc',
'test/lr-wpan-error-model-test.cc',