A Discrete-Event Network Simulator
API
lte-test-fdmt-ff-mac-scheduler.cc
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1/*
2 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation;
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 *
17 * Author: Marco Miozzo <marco.miozzo@cttc.es>,
18 * Nicola Baldo <nbaldo@cttc.es>
19 * Dizhi Zhou <dizhi.zhou@gmail.com>
20 */
21
23
24#include "ns3/double.h"
25#include "ns3/radio-bearer-stats-calculator.h"
26#include "ns3/string.h"
27#include <ns3/boolean.h>
28#include <ns3/constant-position-mobility-model.h>
29#include <ns3/enum.h>
30#include <ns3/eps-bearer.h>
31#include <ns3/ff-mac-scheduler.h>
32#include <ns3/log.h>
33#include <ns3/lte-enb-net-device.h>
34#include <ns3/lte-enb-phy.h>
35#include <ns3/lte-helper.h>
36#include <ns3/lte-ue-net-device.h>
37#include <ns3/lte-ue-phy.h>
38#include <ns3/lte-ue-rrc.h>
39#include <ns3/mobility-helper.h>
40#include <ns3/net-device-container.h>
41#include <ns3/node-container.h>
42#include <ns3/object.h>
43#include <ns3/packet.h>
44#include <ns3/ptr.h>
45#include <ns3/simulator.h>
46#include <ns3/spectrum-error-model.h>
47#include <ns3/spectrum-interference.h>
48#include <ns3/test.h>
49
50#include <iostream>
51#include <sstream>
52#include <string>
53
54using namespace ns3;
55
56NS_LOG_COMPONENT_DEFINE("LenaTestFdMtFfMacScheduler");
57
59 : TestSuite("lte-fdmt-ff-mac-scheduler", SYSTEM)
60{
61 NS_LOG_INFO("creating LenaTestFdMtFfMacSchedulerSuite");
62
63 bool errorModel = false;
64
65 // Test Case : AMC works in FDMT
66
67 // Note: here the MCS is calculated by the narrowband CQI
68
69 // DOWNLINK - DISTANCE 0 -> MCS 28 -> Itbs 26 (from table 7.1.7.2.1-1 of 36.213)
70 // 1 user -> 24 PRB at Itbs 26 -> 2196 -> 2196000 bytes/sec for one UE; 0 bytes/sec for other
71 // UEs 3 users -> 2196000 among 3 users -> 2196000 bytes/sec for one UE; 0 bytes/sec for other
72 // UEs 6 users -> 2196000 among 6 users -> 2196000 bytes/sec for one UE; 0 bytes/sec for other
73 // UEs 12 users -> 2196000 among 12 users -> 2196000 bytes/sec for one UE; 0 bytes/sec for other
74 // UEs UPLINK- DISTANCE 0 -> MCS 28 -> Itbs 26 (from table 7.1.7.2.1-1 of 36.213) 1 user -> 25
75 // PRB at Itbs 26 -> 2292 -> 2292000 bytes/sec 3 users -> 8 PRB at Itbs 26 -> 749 -> 749000
76 // bytes/sec 6 users -> 4 PRB at Itbs 26 -> 373 -> 373000 bytes/sec after the patch enforcing
77 // min 3 PRBs per UE: 12 users -> 3 PRB at Itbs 26 -> 277 bytes * 8/12 UE/TTI -> 184670
78 // bytes/sec
79 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(1, 0, 2196000, 2292000, errorModel),
80 TestCase::EXTENSIVE);
81 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(3, 0, 2196000, 749000, errorModel),
82 TestCase::QUICK);
83 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(6, 0, 2196000, 373000, errorModel),
84 TestCase::EXTENSIVE);
85 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(12, 0, 2196000, 184670, errorModel),
86 TestCase::EXTENSIVE);
87
88 // DOWNLINK - DISTANCE 4800 -> MCS 22 -> Itbs 20 (from table 7.1.7.2.1-1 of 36.213)
89 // 1 user -> 24 PRB at Itbs 20 -> 1383 -> 1383000 byte/secfor one UE; 0 bytes/sec for other UEs
90 // 3 users -> 1383000 among 3 users -> 1383000 bytes/sec for one UE; 0 bytes/sec for other UEs
91 // 6 users -> 1383000 among 6 users -> 1383000 bytes/sec for one UE; 0 bytes/sec for other UEs
92 // 12 users -> 1383000 among 12 users -> 1383000 bytes/sec for one UE; 0 bytes/sec for other UEs
93 // UPLINK - DISTANCE 4800 -> MCS 14 -> Itbs 13 (from table 7.1.7.2.1-1 of 36.213)
94 // 1 user -> 25 PRB at Itbs 13 -> 807 -> 807000 bytes/sec
95 // 3 users -> 8 PRB at Itbs 13 -> 253 -> 253000 bytes/sec
96 // 6 users -> 4 PRB at Itbs 13 -> 125 -> 125000 bytes/sec
97 // after the patch enforcing min 3 PRBs per UE:
98 // 12 users -> 3 PRB at Itbs 13 -> 93 bytes * 8/12 UE/TTI -> 62000 bytes/sec
99 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(1, 4800, 1383000, 807000, errorModel),
100 TestCase::EXTENSIVE);
101 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(3, 4800, 1383000, 253000, errorModel),
102 TestCase::EXTENSIVE);
103 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(6, 4800, 1383000, 125000, errorModel),
104 TestCase::EXTENSIVE);
105 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(12, 4800, 1383000, 62000, errorModel),
106 TestCase::EXTENSIVE);
107
108 // DOWNLINK - DISTANCE 6000 -> MCS 20 -> Itbs 18 (from table 7.1.7.2.1-1 of 36.213)
109 // 1 user -> 24 PRB at Itbs 18 -> 1191 -> 1191000 byte/sec for one UE; 0 bytes/sec for other UEs
110 // 3 users -> 1191000 among 3 users -> 1191000 bytes/sec for one UE; 0 bytes/sec for other UEs
111 // 6 users -> 1191000 among 6 users -> 1191000 bytes/sec for one UE; 0 bytes/sec for other UEs
112 // 12 users ->1191000 among 12 users -> 1191000 bytes/sec for one UE; 0 bytes/sec for other UEs
113 // UPLINK - DISTANCE 6000 -> MCS 12 -> Itbs 11 (from table 7.1.7.2.1-1 of 36.213)
114 // 1 user -> 25 PRB at Itbs 11 -> 621 -> 621000 bytes/sec
115 // 3 users -> 8 PRB at Itbs 11 -> 201 -> 201000 bytes/sec
116 // 6 users -> 4 PRB at Itbs 11 -> 97 -> 97000 bytes/sec
117 // after the patch enforcing min 3 PRBs per UE:
118 // 12 users -> 3 PRB at Itbs 11 -> 73 bytes * 8/12 UE/TTI -> 48667 bytes/sec
119 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(1, 6000, 1191000, 621000, errorModel),
120 TestCase::EXTENSIVE);
121 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(3, 6000, 1191000, 201000, errorModel),
122 TestCase::EXTENSIVE);
123 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(6, 6000, 1191000, 97000, errorModel),
124 TestCase::EXTENSIVE);
125 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(12, 6000, 1191000, 48667, errorModel),
126 TestCase::EXTENSIVE);
127
128 // DOWNLINK - DISTANCE 10000 -> MCS 14 -> Itbs 13 (from table 7.1.7.2.1-1 of 36.213)
129 // 1 user -> 24 PRB at Itbs 13 -> 775 -> 775000 byte/sec for one UE; 0 bytes/sec for other UEs
130 // 3 users -> 775000 among 3 users -> 775000 bytes/sec for one UE; 0 bytes/sec for other UEs
131 // 6 users -> 775000 among 6 users -> 775000 bytes/sec for one UE; 0 bytes/sec for other UEs
132 // 12 users -> 775000 among 12 users -> 775000 bytes/sec for one UE; 0 bytes/sec for other UEs
133 // UPLINK - DISTANCE 10000 -> MCS 8 -> Itbs 8 (from table 7.1.7.2.1-1 of 36.213)
134 // 1 user -> 24 PRB at Itbs 8 -> 437 -> 437000 bytes/sec
135 // 3 users -> 8 PRB at Itbs 8 -> 137 -> 137000 bytes/sec
136 // 6 users -> 4 PRB at Itbs 8 -> 67 -> 67000 bytes/sec
137 // after the patch enforcing min 3 PRBs per UE:
138 // 12 users -> 3 PRB at Itbs 8 -> 49 bytes * 8/12 UE/TTI -> 32667 bytes/sec
139 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(1, 10000, 775000, 437000, errorModel),
140 TestCase::EXTENSIVE);
141 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(3, 10000, 775000, 137000, errorModel),
142 TestCase::EXTENSIVE);
143 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(6, 10000, 775000, 67000, errorModel),
144 TestCase::EXTENSIVE);
145 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(12, 10000, 775000, 32667, errorModel),
146 TestCase::EXTENSIVE);
147
148 // DONWLINK - DISTANCE 20000 -> MCS 8 -> Itbs 8 (from table 7.1.7.2.1-1 of 36.213)
149 // 1 user -> 24 PRB at Itbs 8 -> 421 -> 421000 bytes/sec for one UE; 0 bytes/sec for other UEs
150 // 3 users -> 421000 among 3 users -> 421000 bytes/sec for one UE; 0 bytes/sec for other UEs
151 // 6 users -> 421000 among 6 users -> 421000 bytes/sec for one UE; 0 bytes/sec for other UEs
152 // 12 users -> 421000 among 12 users -> 421000 bytes/sec for one UE; 0 bytes/sec for other UEs
153 // UPLINK - DISTANCE 20000 -> MCS 2 -> Itbs 2 (from table 7.1.7.2.1-1 of 36.213)
154 // 1 user -> 25 PRB at Itbs 2 -> 233 -> 137000 bytes/sec
155 // 3 users -> 8 PRB at Itbs 2 -> 69 -> 41000 bytes/sec
156 // 6 users -> 4 PRB at Itbs 2 -> 32 -> 22000 bytes/sec
157 // after the patch enforcing min 3 PRBs per UE:
158 // 12 users -> 3 PRB at Itbs 2 -> 26 bytes * 8/12 UE/TTI -> 12000 bytes/sec
159 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(1, 20000, 421000, 137000, errorModel),
160 TestCase::EXTENSIVE);
161 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(3, 20000, 421000, 41000, errorModel),
162 TestCase::EXTENSIVE);
163 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(6, 20000, 421000, 22000, errorModel),
164 TestCase::EXTENSIVE);
165 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(12, 20000, 421000, 12000, errorModel),
166 TestCase::EXTENSIVE);
167
168 // DOWNLINK - DISTANCE 100000 -> CQI == 0 -> out of range -> 0 bytes/sec
169 // UPLINK - DISTANCE 100000 -> CQI == 0 -> out of range -> 0 bytes/sec
170 AddTestCase(new LenaFdMtFfMacSchedulerTestCase(1, 100000, 0, 0, errorModel), TestCase::QUICK);
171}
172
174
175// --------------- T E S T - C A S E ------------------------------
176
177std::string
179{
180 std::ostringstream oss;
181 oss << nUser << " UEs, distance " << dist << " m";
182 return oss.str();
183}
184
186 double dist,
187 double thrRefDl,
188 double thrRefUl,
189 bool errorModelEnabled)
190 : TestCase(BuildNameString(nUser, dist)),
191 m_nUser(nUser),
192 m_dist(dist),
193 m_thrRefDl(thrRefDl),
194 m_thrRefUl(thrRefUl),
195 m_errorModelEnabled(errorModelEnabled)
196{
197}
198
200{
201}
202
203void
205{
206 NS_LOG_FUNCTION(this << m_nUser << m_dist);
207
209 {
210 Config::SetDefault("ns3::LteSpectrumPhy::CtrlErrorModelEnabled", BooleanValue(false));
211 Config::SetDefault("ns3::LteSpectrumPhy::DataErrorModelEnabled", BooleanValue(false));
212 }
213
214 Config::SetDefault("ns3::LteHelper::UseIdealRrc", BooleanValue(true));
215 Config::SetDefault("ns3::MacStatsCalculator::DlOutputFilename",
216 StringValue(CreateTempDirFilename("DlMacStats.txt")));
217 Config::SetDefault("ns3::MacStatsCalculator::UlOutputFilename",
218 StringValue(CreateTempDirFilename("UlMacStats.txt")));
219 Config::SetDefault("ns3::RadioBearerStatsCalculator::DlRlcOutputFilename",
220 StringValue(CreateTempDirFilename("DlRlcStats.txt")));
221 Config::SetDefault("ns3::RadioBearerStatsCalculator::UlRlcOutputFilename",
222 StringValue(CreateTempDirFilename("UlRlcStats.txt")));
223
228 Ptr<LteHelper> lteHelper = CreateObject<LteHelper>();
229 lteHelper->SetAttribute("PathlossModel", StringValue("ns3::FriisSpectrumPropagationLossModel"));
230
231 // Create Nodes: eNodeB and UE
232 NodeContainer enbNodes;
233 NodeContainer ueNodes;
234 enbNodes.Create(1);
235 ueNodes.Create(m_nUser);
236
237 // Install Mobility Model
239 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
240 mobility.Install(enbNodes);
241 mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
242 mobility.Install(ueNodes);
243
244 // Create Devices and install them in the Nodes (eNB and UE)
245 NetDeviceContainer enbDevs;
246 NetDeviceContainer ueDevs;
247 lteHelper->SetSchedulerType("ns3::FdMtFfMacScheduler");
248 lteHelper->SetSchedulerAttribute("UlCqiFilter", EnumValue(FfMacScheduler::SRS_UL_CQI));
249 enbDevs = lteHelper->InstallEnbDevice(enbNodes);
250 ueDevs = lteHelper->InstallUeDevice(ueNodes);
251
252 // Attach a UE to a eNB
253 lteHelper->Attach(ueDevs, enbDevs.Get(0));
254
255 // Activate an EPS bearer
256 enum EpsBearer::Qci q = EpsBearer::GBR_CONV_VOICE;
257 EpsBearer bearer(q);
258 lteHelper->ActivateDataRadioBearer(ueDevs, bearer);
259
260 Ptr<LteEnbNetDevice> lteEnbDev = enbDevs.Get(0)->GetObject<LteEnbNetDevice>();
261 Ptr<LteEnbPhy> enbPhy = lteEnbDev->GetPhy();
262 enbPhy->SetAttribute("TxPower", DoubleValue(30.0));
263 enbPhy->SetAttribute("NoiseFigure", DoubleValue(5.0));
264
265 // Set UEs' position and power
266 for (int i = 0; i < m_nUser; i++)
267 {
270 mm->SetPosition(Vector(m_dist, 0.0, 0.0));
271 Ptr<LteUeNetDevice> lteUeDev = ueDevs.Get(i)->GetObject<LteUeNetDevice>();
272 Ptr<LteUePhy> uePhy = lteUeDev->GetPhy();
273 uePhy->SetAttribute("TxPower", DoubleValue(23.0));
274 uePhy->SetAttribute("NoiseFigure", DoubleValue(9.0));
275 }
276
277 double statsStartTime = 0.300; // need to allow for RRC connection establishment + SRS
278 double statsDuration = 0.6;
279 double tolerance = 0.1;
280 Simulator::Stop(Seconds(statsStartTime + statsDuration - 0.000001));
281
282 lteHelper->EnableMacTraces();
283 lteHelper->EnableRlcTraces();
284 Ptr<RadioBearerStatsCalculator> rlcStats = lteHelper->GetRlcStats();
285 rlcStats->SetAttribute("StartTime", TimeValue(Seconds(statsStartTime)));
286 rlcStats->SetAttribute("EpochDuration", TimeValue(Seconds(statsDuration)));
287
288 Simulator::Run();
289
293 NS_LOG_INFO("DL - Test with " << m_nUser << " user(s) at distance " << m_dist);
294 std::vector<uint64_t> dlDataRxed;
295 for (int i = 0; i < m_nUser; i++)
296 {
297 // get the imsi
298 uint64_t imsi = ueDevs.Get(i)->GetObject<LteUeNetDevice>()->GetImsi();
299 uint8_t lcId = 3;
300 dlDataRxed.push_back(rlcStats->GetDlRxData(imsi, lcId));
301 NS_LOG_INFO("\tUser " << i << " imsi " << imsi << " bytes rxed " << (double)dlDataRxed.at(i)
302 << " thr " << (double)dlDataRxed.at(i) / statsDuration << " ref "
303 << m_thrRefDl);
304 }
305
311 uint8_t found = 0;
312 for (int i = 0; i < m_nUser; i++)
313 {
314 double throughput = (double)dlDataRxed.at(i) / statsDuration;
315 if (throughput != 0 && found == 0)
316 {
317 NS_TEST_ASSERT_MSG_EQ_TOL(throughput,
319 m_thrRefDl * tolerance,
320 " Unfair Throughput!");
321 found = 1;
322 }
323 else if (throughput != 0 && found == 1)
324 {
325 NS_TEST_ASSERT_MSG_EQ_TOL(0, m_thrRefDl, m_thrRefDl * tolerance, " Unfair Throughput!");
326 }
327 else
328 {
329 NS_TEST_ASSERT_MSG_EQ_TOL(throughput, 0, 0, " Unfair Throughput!");
330 }
331 }
332
336 NS_LOG_INFO("UL - Test with " << m_nUser << " user(s) at distance " << m_dist);
337 std::vector<uint64_t> ulDataRxed;
338 for (int i = 0; i < m_nUser; i++)
339 {
340 // get the imsi
341 uint64_t imsi = ueDevs.Get(i)->GetObject<LteUeNetDevice>()->GetImsi();
342 // get the lcId
343 uint8_t lcId = 3;
344 ulDataRxed.push_back(rlcStats->GetUlRxData(imsi, lcId));
345 NS_LOG_INFO("\tUser " << i << " imsi " << imsi << " bytes rxed " << (double)ulDataRxed.at(i)
346 << " thr " << (double)ulDataRxed.at(i) / statsDuration << " ref "
347 << m_thrRefUl);
348 }
355 for (int i = 0; i < m_nUser; i++)
356 {
357 NS_TEST_ASSERT_MSG_EQ_TOL((double)ulDataRxed.at(i) / statsDuration,
359 m_thrRefUl * tolerance,
360 " Unfair Throughput!");
361 }
362 Simulator::Destroy();
363}
This system test program creates different test cases with a single eNB and several UEs,...
double m_thrRefDl
DL throughput reference.
LenaFdMtFfMacSchedulerTestCase(uint16_t nUser, double dist, double thrRefDl, double thrRefUl, bool errorModelEnabled)
Constructor.
void DoRun() override
Implementation to actually run this TestCase.
static std::string BuildNameString(uint16_t nUser, double dist)
Builds the test name string based on provided parameter values.
double m_dist
distance between the nodes
double m_thrRefUl
UL throughput reference.
Test suite for LenaFdMtFfMacSchedulerTestCase test case.
AttributeValue implementation for Boolean.
Definition: boolean.h:37
Mobility model for which the current position does not change once it has been set and until it is se...
This class can be used to hold variables of floating point type such as 'double' or 'float'.
Definition: double.h:42
Hold variables of type enum.
Definition: enum.h:56
This class contains the specification of EPS Bearers.
Definition: eps-bearer.h:91
Qci
QoS Class Indicator.
Definition: eps-bearer.h:106
The eNodeB device implementation.
Ptr< LteEnbPhy > GetPhy() const
Ptr< RadioBearerStatsCalculator > GetRlcStats()
Definition: lte-helper.cc:1708
void SetSchedulerAttribute(std::string n, const AttributeValue &v)
Set an attribute for the scheduler to be created.
Definition: lte-helper.cc:303
NetDeviceContainer InstallEnbDevice(NodeContainer c)
Create a set of eNodeB devices.
Definition: lte-helper.cc:482
void SetSchedulerType(std::string type)
Set the type of scheduler to be used by eNodeB devices.
Definition: lte-helper.cc:289
void Attach(NetDeviceContainer ueDevices)
Enables automatic attachment of a set of UE devices to a suitable cell using Idle mode initial cell s...
Definition: lte-helper.cc:1044
void EnableRlcTraces()
Enable trace sinks for RLC layer.
Definition: lte-helper.cc:1563
void ActivateDataRadioBearer(NetDeviceContainer ueDevices, EpsBearer bearer)
Activate a Data Radio Bearer on a given UE devices (for LTE-only simulation).
Definition: lte-helper.cc:1441
NetDeviceContainer InstallUeDevice(NodeContainer c)
Create a set of UE devices.
Definition: lte-helper.cc:497
void EnableMacTraces()
Enable trace sinks for MAC layer.
Definition: lte-helper.cc:1666
The LteUeNetDevice class implements the UE net device.
Helper class used to assign positions and mobility models to nodes.
holds a vector of ns3::NetDevice pointers
Ptr< NetDevice > Get(uint32_t i) const
Get the Ptr<NetDevice> stored in this container at a given index.
keep track of a set of node pointers.
void Create(uint32_t n)
Create n nodes and append pointers to them to the end of this NodeContainer.
Ptr< Node > Get(uint32_t i) const
Get the Ptr<Node> stored in this container at a given index.
void SetAttribute(std::string name, const AttributeValue &value)
Set a single attribute, raising fatal errors if unsuccessful.
Definition: object-base.cc:258
Ptr< T > GetObject() const
Get a pointer to the requested aggregated Object.
Definition: object.h:471
Hold variables of type string.
Definition: string.h:42
encapsulates test code
Definition: test.h:1060
void AddTestCase(TestCase *testCase, TestDuration duration=QUICK)
Add an individual child TestCase to this test suite.
Definition: test.cc:305
std::string CreateTempDirFilename(std::string filename)
Construct the full path to a file in a temporary directory.
Definition: test.cc:442
A suite of tests to run.
Definition: test.h:1256
AttributeValue implementation for Time.
Definition: nstime.h:1425
void SetDefault(std::string name, const AttributeValue &value)
Definition: config.cc:891
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:202
#define NS_LOG_FUNCTION(parameters)
If log level LOG_FUNCTION is enabled, this macro will output all input parameters separated by ",...
#define NS_LOG_INFO(msg)
Use NS_LOG to output a message of level LOG_INFO.
Definition: log.h:275
#define NS_TEST_ASSERT_MSG_EQ_TOL(actual, limit, tol, msg)
Test that actual and expected (limit) values are equal to plus or minus some tolerance and report and...
Definition: test.h:337
Time Seconds(double value)
Construct a Time in the indicated unit.
Definition: nstime.h:1338
static LenaTestFdMtFfMacSchedulerSuite lenaTestFdMtFfMacSchedulerSuite
Every class exported by the ns3 library is enclosed in the ns3 namespace.
mobility
Definition: third.py:96