A Discrete-Event Network Simulator
API
lr-wpan-csmaca.cc
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1/*
2 * Copyright (c) 2011 The Boeing Company
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:
18 * kwong yin <kwong-sang.yin@boeing.com>
19 * Sascha Alexander Jopen <jopen@cs.uni-bonn.de>
20 * Alberto Gallegos Ramonet <ramonet@fc.ritsumei.ac.jp>
21 */
22
23#include "lr-wpan-csmaca.h"
24
25#include <ns3/log.h>
26#include <ns3/random-variable-stream.h>
27#include <ns3/simulator.h>
28
29#include <algorithm>
30
31#undef NS_LOG_APPEND_CONTEXT
32#define NS_LOG_APPEND_CONTEXT std::clog << "[address " << m_mac->GetShortAddress() << "] ";
33
34namespace ns3
35{
36
37NS_LOG_COMPONENT_DEFINE("LrWpanCsmaCa");
38
39NS_OBJECT_ENSURE_REGISTERED(LrWpanCsmaCa);
40
41TypeId
43{
44 static TypeId tid = TypeId("ns3::LrWpanCsmaCa")
46 .SetGroupName("LrWpan")
47 .AddConstructor<LrWpanCsmaCa>();
48 return tid;
49}
50
52{
53 // TODO-- make these into ns-3 attributes
54
55 m_isSlotted = false;
56 m_NB = 0;
57 m_CW = 2;
58 m_macBattLifeExt = false;
59 m_macMinBE = 3;
60 m_macMaxBE = 5;
62 m_aUnitBackoffPeriod = 20; // symbols
63 m_random = CreateObject<UniformRandomVariable>();
65 m_ccaRequestRunning = false;
67 m_coorDest = false;
68}
69
71{
72 m_mac = nullptr;
73}
74
75void
77{
78 m_lrWpanMacStateCallback = MakeNullCallback<void, LrWpanMacState>();
79 m_lrWpanMacTransCostCallback = MakeNullCallback<void, uint32_t>();
80
81 Cancel();
82 m_mac = nullptr;
83}
84
85void
87{
88 m_mac = mac;
89}
90
93{
94 return m_mac;
95}
96
97void
99{
100 NS_LOG_FUNCTION(this);
101 m_isSlotted = true;
102}
103
104void
106{
107 NS_LOG_FUNCTION(this);
108 m_isSlotted = false;
109}
110
111bool
113{
114 NS_LOG_FUNCTION(this);
115 return (m_isSlotted);
116}
117
118bool
120{
121 NS_LOG_FUNCTION(this);
122 return (!m_isSlotted);
123}
124
125void
127{
128 NS_LOG_FUNCTION(this << macMinBE);
129 NS_ASSERT_MSG(macMinBE <= m_macMaxBE,
130 "MacMinBE (" << macMinBE << ") should be <= MacMaxBE (" << m_macMaxBE << ")");
131 m_macMinBE = macMinBE;
132}
133
134uint8_t
136{
137 NS_LOG_FUNCTION(this);
138 return m_macMinBE;
139}
140
141void
143{
144 NS_LOG_FUNCTION(this << macMaxBE);
145 NS_ASSERT_MSG(macMaxBE >= 3 && macMaxBE <= 8,
146 "MacMaxBE (" << macMaxBE << ") should be >= 3 and <= 8");
147 m_macMaxBE = macMaxBE;
148}
149
150uint8_t
152{
153 NS_LOG_FUNCTION(this);
154 return m_macMaxBE;
155}
156
157void
158LrWpanCsmaCa::SetMacMaxCSMABackoffs(uint8_t macMaxCSMABackoffs)
159{
160 NS_LOG_FUNCTION(this << macMaxCSMABackoffs);
161 NS_ASSERT_MSG(macMaxCSMABackoffs <= 5, "MacMaxCSMABackoffs should be <= 5");
162 m_macMaxCSMABackoffs = macMaxCSMABackoffs;
163}
164
165uint8_t
167{
168 NS_LOG_FUNCTION(this);
170}
171
172void
173LrWpanCsmaCa::SetUnitBackoffPeriod(uint64_t unitBackoffPeriod)
174{
175 NS_LOG_FUNCTION(this << unitBackoffPeriod);
176 m_aUnitBackoffPeriod = unitBackoffPeriod;
177}
178
179uint64_t
181{
182 NS_LOG_FUNCTION(this);
184}
185
186Time
188{
189 NS_LOG_FUNCTION(this);
190
191 // The reference for the beginning of the SUPERFRAME (the active period) changes depending
192 // on the data packet being sent from the Coordinator/outgoing frame (Tx beacon time reference)
193 // or other device/incoming frame (Rx beacon time reference ).
194
195 Time elapsedSuperframe; // (i.e The beacon + the elapsed CAP)
196 Time currentTime = Simulator::Now();
197 double symbolsToBoundary;
198 Time nextBoundary;
199 uint64_t elapsedSuperframeSymbols;
200 uint64_t symbolRate =
201 (uint64_t)m_mac->GetPhy()->GetDataOrSymbolRate(false); // symbols per second
202 Time timeAtBoundary;
203
204 if (m_coorDest)
205 {
206 // Take the Incoming Frame Reference
207 elapsedSuperframe = currentTime - m_mac->m_macBeaconRxTime;
208
209 Time beaconTime [[maybe_unused]] = Seconds((double)m_mac->m_rxBeaconSymbols / symbolRate);
210 Time elapsedCap [[maybe_unused]] = elapsedSuperframe - beaconTime;
211 NS_LOG_DEBUG("Elapsed incoming CAP symbols: " << (elapsedCap.GetSeconds() * symbolRate)
212 << " (" << elapsedCap.As(Time::S) << ")");
213 }
214 else
215 {
216 // Take the Outgoing Frame Reference
217 elapsedSuperframe = currentTime - m_mac->m_macBeaconTxTime;
218 }
219
220 // get a close value to the the boundary in symbols
221 elapsedSuperframeSymbols = elapsedSuperframe.GetSeconds() * symbolRate;
222 symbolsToBoundary =
223 m_aUnitBackoffPeriod - std::fmod((double)elapsedSuperframeSymbols, m_aUnitBackoffPeriod);
224
225 timeAtBoundary = Seconds((double)(elapsedSuperframeSymbols + symbolsToBoundary) / symbolRate);
226
227 // get the exact time boundary
228 nextBoundary = timeAtBoundary - elapsedSuperframe;
229
230 NS_LOG_DEBUG("Elapsed Superframe symbols: " << elapsedSuperframeSymbols << " ("
231 << elapsedSuperframe.As(Time::S) << ")");
232
233 NS_LOG_DEBUG("Next backoff period boundary in approx. "
234 << nextBoundary.GetSeconds() * symbolRate << " symbols ("
235 << nextBoundary.As(Time::S) << ")");
236
237 return nextBoundary;
238}
239
240void
242{
243 NS_LOG_FUNCTION(this);
244 m_NB = 0;
245 if (IsSlottedCsmaCa())
246 {
247 // TODO: Check if the current PHY is using the Japanese band 950 Mhz:
248 // (IEEE_802_15_4_950MHZ_BPSK and IEEE_802_15_4_950MHZ_2GFSK)
249 // if in use, m_CW = 1.
250 // Currently 950 Mhz band PHYs are not supported in ns-3.
251 // To know the current used PHY, making the method for GetPhy()->GetMyPhyOption()
252 // public is necessary. Alternatively, the current PHY used
253 // can be known using phyCurrentPage variable.
254
255 m_CW = 2;
256
258 {
259 m_BE = std::min(static_cast<uint8_t>(2), m_macMinBE);
260 }
261 else
262 {
264 }
265
266 // m_coorDest to decide between incoming and outgoing superframes times
267 m_coorDest = m_mac->isCoordDest();
268
269 // Locate backoff period boundary. (i.e. a time delay to align with the next backoff period
270 // boundary)
271 Time backoffBoundary = GetTimeToNextSlot();
274 }
275 else
276 {
279 }
280}
281
282void
284{
288 m_mac->GetPhy()->CcaCancel();
289}
290
291void
293{
294 NS_LOG_FUNCTION(this);
295
296 uint64_t upperBound = (uint64_t)pow(2, m_BE) - 1;
297 Time randomBackoff;
298 uint64_t symbolRate;
299 Time timeLeftInCap;
300
301 symbolRate = (uint64_t)m_mac->GetPhy()->GetDataOrSymbolRate(false); // symbols per second
302
303 // We should not recalculate the random backoffPeriods if we are in a slotted CSMA-CA and the
304 // transmission was previously deferred (m_randomBackoffPeriods != 0)
306 {
307 m_randomBackoffPeriodsLeft = (uint64_t)m_random->GetValue(0, upperBound + 1);
308 }
309
310 randomBackoff =
311 Seconds((double)(m_randomBackoffPeriodsLeft * GetUnitBackoffPeriod()) / symbolRate);
312
313 if (IsUnSlottedCsmaCa())
314 {
315 NS_LOG_DEBUG("Unslotted CSMA-CA: requesting CCA after backoff of "
316 << m_randomBackoffPeriodsLeft << " periods (" << randomBackoff.As(Time::S)
317 << ")");
319 }
320 else
321 {
322 // We must make sure there is enough time left in the CAP, otherwise we continue in
323 // the CAP of the next superframe after the transmission/reception of the beacon (and the
324 // IFS)
325 timeLeftInCap = GetTimeLeftInCap();
326
327 NS_LOG_DEBUG("Slotted CSMA-CA: proceeding after random backoff of "
328 << m_randomBackoffPeriodsLeft << " periods ("
329 << (randomBackoff.GetSeconds() * symbolRate) << " symbols or "
330 << randomBackoff.As(Time::S) << ")");
331
332 NS_LOG_DEBUG("Backoff periods left in CAP: "
333 << ((timeLeftInCap.GetSeconds() * symbolRate) / m_aUnitBackoffPeriod) << " ("
334 << (timeLeftInCap.GetSeconds() * symbolRate) << " symbols or "
335 << timeLeftInCap.As(Time::S) << ")");
336
337 if (randomBackoff >= timeLeftInCap)
338 {
339 uint64_t usedBackoffs =
340 (double)(timeLeftInCap.GetSeconds() * symbolRate) / m_aUnitBackoffPeriod;
341 m_randomBackoffPeriodsLeft -= usedBackoffs;
342 NS_LOG_DEBUG("No time in CAP to complete backoff delay, deferring to the next CAP");
345 }
346 else
347 {
349 }
350 }
351}
352
353Time
355{
356 Time currentTime;
357 uint64_t capSymbols;
358 Time endCapTime;
359 uint64_t activeSlot;
360 uint64_t symbolRate;
361 Time rxBeaconTime;
362
363 // At this point, the currentTime should be aligned on a backoff period boundary
364 currentTime = Simulator::Now();
365 symbolRate = (uint64_t)m_mac->GetPhy()->GetDataOrSymbolRate(false); // symbols per second
366
367 if (m_coorDest)
368 { // Take Incoming frame reference
369 activeSlot = m_mac->m_incomingSuperframeDuration / 16;
370 capSymbols = activeSlot * (m_mac->m_incomingFnlCapSlot + 1);
371 endCapTime = m_mac->m_macBeaconRxTime + Seconds((double)capSymbols / symbolRate);
372 }
373 else
374 { // Take Outgoing frame reference
375 activeSlot = m_mac->m_superframeDuration / 16;
376 capSymbols = activeSlot * (m_mac->m_fnlCapSlot + 1);
377 endCapTime = m_mac->m_macBeaconTxTime + Seconds((double)capSymbols / symbolRate);
378 }
379
380 return (endCapTime - currentTime);
381}
382
383void
385{
386 NS_LOG_FUNCTION(this);
387
388 Time timeLeftInCap;
389 uint16_t ccaSymbols;
390 uint32_t transactionSymbols;
391 Time transactionTime;
392 uint64_t symbolRate;
393
394 ccaSymbols = 0;
396 symbolRate = (uint64_t)m_mac->GetPhy()->GetDataOrSymbolRate(false);
397 timeLeftInCap = GetTimeLeftInCap();
398
399 // TODO: On the 950 Mhz Band (Japanese Band)
400 // only a single CCA check is performed;
401 // the CCA check duration time is:
402 //
403 // CCA symbols = phyCCADuration * m_CW (1)
404 // other PHYs:
405 // CCA symbols = 8 * m_CW(2)
406 //
407 // note: phyCCADuration & 950Mhz band PHYs are
408 // not currently implemented in ns-3.
409 ccaSymbols += 8 * m_CW;
410
411 // The MAC sublayer shall proceed if the remaining CSMA-CA algorithm steps
412 // can be completed before the end of the CAP.
413 // See IEEE 802.15.4-2011 (Sections 5.1.1.1 and 5.1.1.4)
414 // Transaction = 2 CCA + frame transmission (SHR+PHR+PPDU) + turnaroudtime*2 (Rx->Tx & Tx->Rx) +
415 // IFS (LIFS or SIFS) and Ack time (if ack flag true)
416
417 transactionSymbols = ccaSymbols + m_mac->GetTxPacketSymbols();
418
419 if (m_mac->isTxAckReq())
420 {
421 NS_LOG_DEBUG("ACK duration symbols: " << m_mac->GetMacAckWaitDuration());
422 transactionSymbols += m_mac->GetMacAckWaitDuration();
423 }
424 else
425 {
426 // time the PHY takes to switch from Rx to Tx and Tx to Rx
427 transactionSymbols += (m_mac->GetPhy()->aTurnaroundTime * 2);
428 }
429 transactionSymbols += m_mac->GetIfsSize();
430
431 // Report the transaction cost
433 {
434 m_lrWpanMacTransCostCallback(transactionSymbols);
435 }
436
437 transactionTime = Seconds((double)transactionSymbols / symbolRate);
438 NS_LOG_DEBUG("Total required transaction: " << transactionSymbols << " symbols ("
439 << transactionTime.As(Time::S) << ")");
440
441 if (transactionTime > timeLeftInCap)
442 {
443 NS_LOG_DEBUG("Transaction of "
444 << transactionSymbols << " symbols "
445 << "cannot be completed in CAP, deferring transmission to the next CAP");
446
447 NS_LOG_DEBUG("Symbols left in CAP: " << (timeLeftInCap.GetSeconds() * symbolRate) << " ("
448 << timeLeftInCap.As(Time::S) << ")");
449
451 }
452 else
453 {
455 }
456}
457
458void
460{
461 NS_LOG_FUNCTION(this);
462 m_ccaRequestRunning = true;
463 m_mac->GetPhy()->PlmeCcaRequest();
464}
465
466void
468{
469 NS_LOG_FUNCTION(this);
471}
472
473void
475{
476 NS_LOG_FUNCTION(this << status);
477
478 // Only react on this event, if we are actually waiting for a CCA.
479 // If the CSMA algorithm was canceled, we could still receive this event from
480 // the PHY. In this case we ignore the event.
482 {
483 m_ccaRequestRunning = false;
484 if (status == IEEE_802_15_4_PHY_IDLE)
485 {
486 if (IsSlottedCsmaCa())
487 {
488 m_CW--;
489 if (m_CW == 0)
490 {
491 // inform MAC channel is idle
493 {
494 NS_LOG_LOGIC("Notifying MAC of idle channel");
496 }
497 }
498 else
499 {
500 NS_LOG_LOGIC("Perform CCA again, m_CW = " << m_CW);
502 this); // Perform CCA again
503 }
504 }
505 else
506 {
507 // inform MAC, channel is idle
509 {
510 NS_LOG_LOGIC("Notifying MAC of idle channel");
512 }
513 }
514 }
515 else
516 {
517 if (IsSlottedCsmaCa())
518 {
519 m_CW = 2;
520 }
521 m_BE = std::min(static_cast<uint16_t>(m_BE + 1), static_cast<uint16_t>(m_macMaxBE));
522 m_NB++;
524 {
525 // no channel found so cannot send pkt
526 NS_LOG_DEBUG("Channel access failure");
528 {
529 NS_LOG_LOGIC("Notifying MAC of Channel access failure");
531 }
532 return;
533 }
534 else
535 {
536 NS_LOG_DEBUG("Perform another backoff; m_NB = " << static_cast<uint16_t>(m_NB));
539 this); // Perform another backoff (step 2)
540 }
541 }
542 }
543}
544
545void
547{
548 NS_LOG_FUNCTION(this);
550}
551
552void
554{
555 NS_LOG_FUNCTION(this);
557}
558
559void
561{
562 m_macBattLifeExt = batteryLifeExtension;
563}
564
565int64_t
567{
568 NS_LOG_FUNCTION(this);
569 m_random->SetStream(stream);
570 return 1;
571}
572
573uint8_t
575{
576 return m_NB;
577}
578
579bool
581{
582 return m_macBattLifeExt;
583}
584
585} // namespace ns3
#define min(a, b)
Definition: 80211b.c:42
bool IsNull() const
Check for null implementation.
Definition: callback.h:556
void Cancel()
This method is syntactic sugar for the ns3::Simulator::Cancel method.
Definition: event-id.cc:55
This class is a helper for the LrWpanMac to manage the Csma/CA state machine according to IEEE 802....
uint64_t m_aUnitBackoffPeriod
Number of symbols per CSMA/CA time unit, default 20 symbols.
Ptr< LrWpanMac > m_mac
The MAC instance for which this CSMA/CA implemenation is configured.
void SetBatteryLifeExtension(bool batteryLifeExtension)
Set the value of the Battery Life Extension.
void PlmeCcaConfirm(LrWpanPhyEnumeration status)
IEEE 802.15.4-2006 section 6.2.2.2 PLME-CCA.confirm status.
LrWpanCsmaCa()
Default constructor.
void RequestCCA()
Request the Phy to perform CCA (Step 3)
uint8_t GetMacMinBE() const
Get the minimum backoff exponent value.
bool m_isSlotted
Beacon-enabled slotted or nonbeacon-enabled unslotted CSMA-CA.
uint8_t m_BE
Backoff exponent.
EventId m_canProceedEvent
Scheduler event for checking if we can complete the transmission before the end of the CAP.
static TypeId GetTypeId()
Get the type ID.
EventId m_randomBackoffEvent
Scheduler event for the start of the next random backoff/slot.
bool GetBatteryLifeExtension()
Get the value of the Battery Life Extension.
void SetUnSlottedCsmaCa()
Configure for the use of the unslotted CSMA/CA version.
void DeferCsmaTimeout()
The CSMA algorithm call this function at the end of the CAP to return the MAC state back to to IDLE a...
bool IsUnSlottedCsmaCa() const
Check if the unslotted CSMA/CA version is being used.
void SetMac(Ptr< LrWpanMac > mac)
Set the MAC to which this CSMA/CA implementation is attached to.
LrWpanMacStateCallback m_lrWpanMacStateCallback
The callback to inform the configured MAC of the CSMA/CA result.
Ptr< LrWpanMac > GetMac() const
Get the MAC to which this CSMA/CA implementation is attached to.
LrWpanMacTransCostCallback m_lrWpanMacTransCostCallback
The callback to inform the cost of a transaction in slotted CSMA-CA.
void Cancel()
Cancel CSMA-CA algorithm.
uint8_t GetNB()
Get the number of CSMA retries.
EventId m_requestCcaEvent
Scheduler event when to start the CCA after a random backoff.
bool m_coorDest
Indicates whether the CSMA procedure is targeted for a message to be sent to the coordinator.
bool IsSlottedCsmaCa() const
Check if the slotted CSMA/CA version is being used.
void SetLrWpanMacTransCostCallback(LrWpanMacTransCostCallback trans)
Set the callback function to report a transaction cost in slotted CSMA-CA.
void SetMacMaxBE(uint8_t macMaxBE)
Set the maximum backoff exponent value.
void RandomBackoffDelay()
In step 2 of the CSMA-CA, perform a random backoff in the range of 0 to 2^BE -1.
uint8_t m_macMaxBE
Maximum backoff exponent.
void SetMacMinBE(uint8_t macMinBE)
Set the minimum backoff exponent value.
uint8_t m_CW
Contention window length (used in slotted ver only).
uint8_t m_macMinBE
Minimum backoff exponent.
uint8_t GetMacMaxCSMABackoffs() const
Get the maximum number of backoffs.
void SetUnitBackoffPeriod(uint64_t unitBackoffPeriod)
Set the number of symbols forming the basic time period used by the CSMA-CA algorithm.
bool m_macBattLifeExt
Battery Life Extension.
Time GetTimeToNextSlot() const
Locates the time to the next backoff period boundary in the SUPERFRAME and returns the amount of time...
uint8_t GetMacMaxBE() const
Get the maximum backoff exponent value.
void SetSlottedCsmaCa()
Configure for the use of the slotted CSMA/CA version.
EventId m_endCapEvent
Scheduler event for the end of the current CAP.
void CanProceed()
In the slotted CSMA-CA, after random backoff, determine if the remaining CSMA-CA operation can procee...
uint64_t m_randomBackoffPeriodsLeft
Count the number of remaining random backoff periods left to delay.
Time GetTimeLeftInCap()
Get the time left in the CAP portion of the Outgoing or Incoming superframe.
~LrWpanCsmaCa() override
bool m_ccaRequestRunning
Flag indicating that the PHY is currently running a CCA.
void SetLrWpanMacStateCallback(LrWpanMacStateCallback macState)
Set the callback function to the MAC.
void DoDispose() override
Destructor implementation.
void Start()
Start CSMA-CA algorithm (step 1), initialize NB, BE for both slotted and unslotted CSMA-CA.
uint8_t m_NB
Number of backoffs for the current transmission.
Ptr< UniformRandomVariable > m_random
Uniform random variable stream.
void SetMacMaxCSMABackoffs(uint8_t macMaxCSMABackoffs)
Set the maximum number of backoffs.
uint64_t GetUnitBackoffPeriod() const
Get the number of symbols forming the basic time period used by the CSMA-CA algorithm.
int64_t AssignStreams(int64_t stream)
Assign a fixed random variable stream number to the random variables used by this model.
uint8_t m_macMaxCSMABackoffs
Maximum number of backoffs.
A base class which provides memory management and object aggregation.
Definition: object.h:89
Smart pointer class similar to boost::intrusive_ptr.
Definition: ptr.h:78
void SetStream(int64_t stream)
Specifies the stream number for the RngStream.
static EventId Schedule(const Time &delay, FUNC f, Ts &&... args)
Schedule an event to expire after delay.
Definition: simulator.h:568
static Time Now()
Return the current simulation virtual time.
Definition: simulator.cc:199
static EventId ScheduleNow(FUNC f, Ts &&... args)
Schedule an event to expire Now.
Definition: simulator.h:606
Simulation virtual time values and global simulation resolution.
Definition: nstime.h:105
double GetSeconds() const
Get an approximation of the time stored in this instance in the indicated unit.
Definition: nstime.h:402
@ S
second
Definition: nstime.h:116
TimeWithUnit As(const enum Unit unit=Time::AUTO) const
Attach a unit to a Time, to facilitate output in a specific unit.
Definition: time.cc:417
a unique identifier for an interface.
Definition: type-id.h:60
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:935
double GetValue(double min, double max)
Get the next random value, as a double in the specified range .
#define NS_ASSERT_MSG(condition, message)
At runtime, in debugging builds, if this condition is not true, the program prints the message to out...
Definition: assert.h:86
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:202
#define NS_LOG_DEBUG(msg)
Use NS_LOG to output a message of level LOG_DEBUG.
Definition: log.h:268
#define NS_LOG_LOGIC(msg)
Use NS_LOG to output a message of level LOG_LOGIC.
Definition: log.h:282
#define NS_LOG_FUNCTION(parameters)
If log level LOG_FUNCTION is enabled, this macro will output all input parameters separated by ",...
LrWpanPhyEnumeration
IEEE802.15.4-2006 PHY Emumerations Table 18 in section 6.2.3.
Definition: lr-wpan-phy.h:109
@ CHANNEL_ACCESS_FAILURE
CHANNEL_ACCESS_FAILURE.
Definition: lr-wpan-mac.h:78
@ MAC_CSMA_DEFERRED
MAC_CSMA_DEFERRED.
Definition: lr-wpan-mac.h:83
@ CHANNEL_IDLE
CHANNEL_IDLE.
Definition: lr-wpan-mac.h:79
@ IEEE_802_15_4_PHY_IDLE
Definition: lr-wpan-phy.h:114
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Definition: object-base.h:45
Time Seconds(double value)
Construct a Time in the indicated unit.
Definition: nstime.h:1338
Every class exported by the ns3 library is enclosed in the ns3 namespace.
mac
Definition: third.py:85