A Discrete-Event Network Simulator
API
lr-wpan-csmaca.cc
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1/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
2/*
3 * Copyright (c) 2011 The Boeing Company
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation;
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Author:
19 * kwong yin <kwong-sang.yin@boeing.com>
20 * Sascha Alexander Jopen <jopen@cs.uni-bonn.de>
21 * Alberto Gallegos Ramonet <ramonet@fc.ritsumei.ac.jp>
22 */
23
24#include "lr-wpan-csmaca.h"
25#include <ns3/random-variable-stream.h>
26#include <ns3/simulator.h>
27#include <ns3/log.h>
28#include <algorithm>
29
30#undef NS_LOG_APPEND_CONTEXT
31#define NS_LOG_APPEND_CONTEXT \
32 std::clog << "[address " << m_mac->GetShortAddress () << "] ";
33
34namespace ns3 {
35
36NS_LOG_COMPONENT_DEFINE ("LrWpanCsmaCa");
37
38NS_OBJECT_ENSURE_REGISTERED (LrWpanCsmaCa);
39
40TypeId
42{
43 static TypeId tid = TypeId ("ns3::LrWpanCsmaCa")
44 .SetParent<Object> ()
45 .SetGroupName ("LrWpan")
46 .AddConstructor<LrWpanCsmaCa> ()
47 ;
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 = 0;
73}
74
75void
77{
78 m_lrWpanMacStateCallback = MakeNullCallback <void, LrWpanMacState> ();
79 m_lrWpanMacTransCostCallback = MakeNullCallback <void, uint32_t> ();
80
81 Cancel ();
82 m_mac = 0;
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 m_macMinBE = macMinBE;
130}
131
132uint8_t
134{
135 NS_LOG_FUNCTION (this);
136 return m_macMinBE;
137}
138
139void
141{
142 NS_LOG_FUNCTION (this << macMaxBE);
143 m_macMinBE = macMaxBE;
144}
145
146uint8_t
148{
149 NS_LOG_FUNCTION (this);
150 return m_macMaxBE;
151}
152
153void
154LrWpanCsmaCa::SetMacMaxCSMABackoffs (uint8_t macMaxCSMABackoffs)
155{
156 NS_LOG_FUNCTION (this << macMaxCSMABackoffs);
157 m_macMaxCSMABackoffs = macMaxCSMABackoffs;
158}
159
160uint8_t
162{
163 NS_LOG_FUNCTION (this);
165}
166
167void
168LrWpanCsmaCa::SetUnitBackoffPeriod (uint64_t unitBackoffPeriod)
169{
170 NS_LOG_FUNCTION (this << unitBackoffPeriod);
171 m_aUnitBackoffPeriod = unitBackoffPeriod;
172}
173
174uint64_t
176{
177 NS_LOG_FUNCTION (this);
179}
180
181
182Time
184{
185 NS_LOG_FUNCTION (this);
186
187 // The reference for the beginning of the SUPERFRAME (the active period) changes depending
188 // on the data packet being sent from the Coordinator/outgoing frame (Tx beacon time reference)
189 // or other device/incoming frame (Rx beacon time reference ).
190
191 Time elapsedSuperframe; // (i.e The beacon + the elapsed CAP)
192 Time currentTime;
193 double symbolsToBoundary;
194 Time nextBoundary;
195 uint64_t elapsedSuperframeSymbols;
196 uint64_t symbolRate;
197 Time timeAtBoundary;
198 [[maybe_unused]] Time elapsedCap;
199 [[maybe_unused]] Time beaconTime;
200
201
202 currentTime = Simulator::Now ();
203 symbolRate = (uint64_t) m_mac->GetPhy ()->GetDataOrSymbolRate (false); //symbols per second
204
205 if (m_coorDest)
206 {
207 // Take the Incoming Frame Reference
208 elapsedSuperframe = currentTime - m_mac->m_macBeaconRxTime;
209
210 beaconTime = Seconds ((double) m_mac->m_rxBeaconSymbols / symbolRate);
211 elapsedCap = elapsedSuperframe - beaconTime;
212 NS_LOG_DEBUG ("Elapsed incoming CAP symbols: " << (elapsedCap.GetSeconds () * symbolRate) << " (" << 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 = m_aUnitBackoffPeriod - std::fmod ((double) elapsedSuperframeSymbols,m_aUnitBackoffPeriod);
223
224 timeAtBoundary = Seconds ((double)(elapsedSuperframeSymbols + symbolsToBoundary) / symbolRate);
225
226 // get the exact time boundary
227 nextBoundary = timeAtBoundary - elapsedSuperframe;
228
229 NS_LOG_DEBUG ("Elapsed Superframe symbols: " << elapsedSuperframeSymbols << " ("
230 << elapsedSuperframe.As (Time::S) << ")");
231
232 NS_LOG_DEBUG ("Next backoff period boundary in approx. " << nextBoundary.GetSeconds () * symbolRate << " symbols ("
233 << nextBoundary.As (Time::S) << ")");
234
235 return nextBoundary;
236
237}
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 boundary)
270 Time backoffBoundary = GetTimeToNextSlot ();
272
273 }
274 else
275 {
278 }
279}
280
281void
283{
287}
288
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 = Seconds ((double) (m_randomBackoffPeriodsLeft * GetUnitBackoffPeriod ()) / symbolRate);
311
312 if (IsUnSlottedCsmaCa ())
313 {
314 NS_LOG_DEBUG ("Unslotted CSMA-CA: requesting CCA after backoff of " << m_randomBackoffPeriodsLeft <<
315 " periods (" << randomBackoff.As (Time::S) << ")");
317 }
318 else
319 {
320 // We must make sure there is enough time left in the CAP, otherwise we continue in
321 // the CAP of the next superframe after the transmission/reception of the beacon (and the IFS)
322 timeLeftInCap = GetTimeLeftInCap ();
323
324 NS_LOG_DEBUG ("Slotted CSMA-CA: proceeding after random backoff of " << m_randomBackoffPeriodsLeft <<
325 " periods (" << (randomBackoff.GetSeconds () * symbolRate) << " symbols or " << randomBackoff.As (Time::S) << ")");
326
327
328
329
330 NS_LOG_DEBUG ("Backoff periods left in CAP: " << ((timeLeftInCap.GetSeconds () * symbolRate) / m_aUnitBackoffPeriod) << " ("
331 << (timeLeftInCap.GetSeconds () * symbolRate) << " symbols or "
332 << timeLeftInCap.As (Time::S) << ")");
333
334
335 if (randomBackoff > timeLeftInCap)
336 {
337 uint64_t usedBackoffs = (double)(timeLeftInCap.GetSeconds () * symbolRate) / m_aUnitBackoffPeriod;
338 m_randomBackoffPeriodsLeft -= usedBackoffs;
339 NS_LOG_DEBUG ("No time in CAP to complete backoff delay, deferring to the next CAP");
341 }
342 else
343 {
345 }
346
347 }
348}
349
350
351Time
353{
354 Time currentTime;
355 uint64_t capSymbols;
356 Time endCapTime;
357 uint64_t activeSlot;
358 uint64_t symbolRate;
359 Time rxBeaconTime;
360
361
362 // At this point, the currentTime should be aligned on a backoff period boundary
363 currentTime = Simulator::Now ();
364 symbolRate = (uint64_t) m_mac->GetPhy ()->GetDataOrSymbolRate (false); //symbols per second
365
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 +
372 Seconds ((double) capSymbols / symbolRate);
373 }
374 else
375 { // Take Outgoing frame reference
376 activeSlot = m_mac->m_superframeDuration / 16;
377 capSymbols = activeSlot * (m_mac->m_fnlCapSlot + 1);
378 endCapTime = m_mac->m_macBeaconTxTime +
379 Seconds ((double) capSymbols / symbolRate);
380 }
381
382 return (endCapTime - currentTime);
383}
384
385
386void
388{
389 NS_LOG_FUNCTION (this);
390
391 Time timeLeftInCap;
392 uint16_t ccaSymbols;
393 uint32_t transactionSymbols;
394 Time transactionTime;
395 uint64_t symbolRate;
396
397 ccaSymbols = 0;
399 symbolRate = (uint64_t) m_mac->GetPhy ()->GetDataOrSymbolRate (false);
400 timeLeftInCap = GetTimeLeftInCap ();
401
402
403 // TODO: On the 950 Mhz Band (Japanese Band)
404 // only a single CCA check is performed;
405 // the CCA check duration time is:
406 //
407 // CCA symbols = phyCCADuration * m_CW (1)
408 // other PHYs:
409 // CCA symbols = 8 * m_CW(2)
410 //
411 // note: phyCCADuration & 950Mhz band PHYs are
412 // not currently implemented in ns-3.
413 ccaSymbols += 8 * m_CW;
414
415 // The MAC sublayer shall proceed if the remaining CSMA-CA algorithm steps
416 // can be completed before the end of the CAP.
417 // See IEEE 802.15.4-2011 (Sections 5.1.1.1 and 5.1.1.4)
418 // Transaction = 2 CCA + frame transmission (SHR+PHR+PPDU) + turnaroudtime*2 (Rx->Tx & Tx->Rx) + IFS (LIFS or SIFS) and Ack time (if ack flag true)
419
420 transactionSymbols = ccaSymbols + m_mac->GetTxPacketSymbols ();
421
422 if (m_mac->isTxAckReq ())
423 {
424 NS_LOG_DEBUG ("ACK duration symbols: " << m_mac->GetMacAckWaitDuration ());
425 transactionSymbols += m_mac->GetMacAckWaitDuration ();
426 }
427 else
428 {
429 //time the PHY takes to switch from Rx to Tx and Tx to Rx
430 transactionSymbols += (m_mac->GetPhy ()->aTurnaroundTime *2);
431 }
432 transactionSymbols += m_mac->GetIfsSize ();
433
434 // Report the transaction cost
436 {
437 m_lrWpanMacTransCostCallback (transactionSymbols);
438 }
439
440 transactionTime = Seconds ((double) transactionSymbols / symbolRate);
441 NS_LOG_DEBUG ("Total required transaction: " << transactionSymbols << " symbols (" << transactionTime.As (Time::S) << ")");
442
443 if (transactionTime > timeLeftInCap)
444 {
445 NS_LOG_DEBUG ("Transaction of " << transactionSymbols << " symbols " <<
446 "cannot be completed in CAP, deferring transmission to the next CAP");
447
448
449
450 NS_LOG_DEBUG ("Symbols left in CAP: " << (timeLeftInCap.GetSeconds () * symbolRate) <<
451 " (" << timeLeftInCap.As (Time::S) << ")");
452
454 }
455 else
456 {
458 }
459
460}
461
462void
464{
465 NS_LOG_FUNCTION (this);
466 m_ccaRequestRunning = true;
467 m_mac->GetPhy ()->PlmeCcaRequest ();
468}
469
470void
472{
473 NS_LOG_FUNCTION (this);
475}
476
477void
479{
480 NS_LOG_FUNCTION (this << status);
481
482 // Only react on this event, if we are actually waiting for a CCA.
483 // If the CSMA algorithm was canceled, we could still receive this event from
484 // the PHY. In this case we ignore the event.
486 {
487 m_ccaRequestRunning = false;
488 if (status == IEEE_802_15_4_PHY_IDLE)
489 {
490 if (IsSlottedCsmaCa ())
491 {
492 m_CW--;
493 if (m_CW == 0)
494 {
495 // inform MAC channel is idle
497 {
498 NS_LOG_LOGIC ("Notifying MAC of idle channel");
500 }
501 }
502 else
503 {
504 NS_LOG_LOGIC ("Perform CCA again, m_CW = " << m_CW);
506 }
507 }
508 else
509 {
510 // inform MAC, channel is idle
512 {
513 NS_LOG_LOGIC ("Notifying MAC of idle channel");
515 }
516 }
517 }
518 else
519 {
520 if (IsSlottedCsmaCa ())
521 {
522 m_CW = 2;
523 }
524 m_BE = std::min (static_cast<uint16_t> (m_BE + 1), static_cast<uint16_t> (m_macMaxBE));
525 m_NB++;
527 {
528 // no channel found so cannot send pkt
529 NS_LOG_DEBUG ("Channel access failure");
531 {
532 NS_LOG_LOGIC ("Notifying MAC of Channel access failure");
534 }
535 return;
536 }
537 else
538 {
539 NS_LOG_DEBUG ("Perform another backoff; m_NB = " << static_cast<uint16_t> (m_NB));
540 m_randomBackoffEvent = Simulator::ScheduleNow (&LrWpanCsmaCa::RandomBackoffDelay, this); //Perform another backoff (step 2)
541 }
542 }
543 }
544}
545
546
547void
549{
550 NS_LOG_FUNCTION (this);
552}
553
554
555void
557{
558 NS_LOG_FUNCTION (this);
560}
561
562void
563LrWpanCsmaCa::SetBatteryLifeExtension (bool batteryLifeExtension)
564{
565 m_macBattLifeExt = batteryLifeExtension;
566}
567
568
569int64_t
571{
572 NS_LOG_FUNCTION (this);
573 m_random->SetStream (stream);
574 return 1;
575}
576
577uint8_t
579{
580 return m_NB;
581}
582
583bool
585{
586 return m_macBattLifeExt;
587}
588
589} //namespace ns3
#define min(a, b)
Definition: 80211b.c:42
bool IsNull(void) const
Check for null implementation.
Definition: callback.h:1386
void Cancel(void)
This method is syntactic sugar for the ns3::Simulator::Cancel method.
Definition: event-id.cc:53
This class is a helper for the LrWpanMac to manage the Csma/CA state machine according to IEEE 802....
static TypeId GetTypeId(void)
Get the type ID.
bool GetBatteryLifeExtension(void)
Get the value of the Battery Life Extension.
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.
void RandomBackoffDelay(void)
In step 2 of the CSMA-CA, perform a random backoff in the range of 0 to 2^BE -1.
uint8_t GetMacMinBE(void) 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.
EventId m_randomBackoffEvent
Scheduler event for the start of the next random backoff/slot.
LrWpanCsmaCa(void)
Default constructor.
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.
void SetUnSlottedCsmaCa(void)
Configure for the use of the unslotted CSMA/CA version.
uint64_t GetUnitBackoffPeriod(void) const
Get the number of symbols forming the basic time period used by the CSMA-CA algorithm.
void Start(void)
Start CSMA-CA algorithm (step 1), initialize NB, BE for both slotted and unslotted CSMA-CA.
LrWpanMacTransCostCallback m_lrWpanMacTransCostCallback
The callback to inform the cost of a transaction in slotted CSMA-CA.
uint8_t GetMacMaxCSMABackoffs(void) const
Get the maximum number of backoffs.
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.
void SetLrWpanMacTransCostCallback(LrWpanMacTransCostCallback trans)
Set the callback function to report a transaction cost in slotted CSMA-CA.
bool IsUnSlottedCsmaCa(void) const
Check if the unslotted CSMA/CA version is being used.
void Cancel(void)
Cancel CSMA-CA algorithm.
void SetMacMaxBE(uint8_t macMaxBE)
Set the maximum backoff exponent value.
uint8_t m_macMaxBE
Maximum backoff exponent.
Ptr< LrWpanMac > GetMac(void) const
Get the MAC to which this CSMA/CA implementation is attached to.
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.
bool IsSlottedCsmaCa(void) const
Check if the slotted CSMA/CA version is being used.
uint8_t GetNB(void)
Get the number of CSMA retries.
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.
void CanProceed(void)
In the slotted CSMA-CA, after random backoff, determine if the remaining CSMA-CA operation can procee...
void DeferCsmaTimeout(void)
The CSMA algorithm call this function at the end of the CAP to return the MAC state back to to IDLE a...
EventId m_endCapEvent
Scheduler event for the end of the current CAP.
virtual ~LrWpanCsmaCa(void)
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.
virtual void DoDispose(void)
Destructor implementation.
bool m_ccaRequestRunning
Flag indicating that the PHY is currently running a CCA.
void RequestCCA(void)
Request the Phy to perform CCA (Step 3)
void SetLrWpanMacStateCallback(LrWpanMacStateCallback macState)
Set the callback function to the MAC.
uint8_t GetMacMaxBE(void) const
Get the maximum backoff exponent value.
void SetSlottedCsmaCa(void)
Configure for the use of the slotted CSMA/CA version.
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.
int64_t AssignStreams(int64_t stream)
Assign a fixed random variable stream number to the random variables used by this model.
Time GetTimeToNextSlot(void) const
Locates the time to the next backoff period boundary in the SUPERFRAME and returns the amount of time...
uint8_t m_macMaxCSMABackoffs
Maximum number of backoffs.
A base class which provides memory management and object aggregation.
Definition: object.h:88
Smart pointer class similar to boost::intrusive_ptr.
Definition: ptr.h:74
void SetStream(int64_t stream)
Specifies the stream number for the RngStream.
static EventId Schedule(Time const &delay, FUNC f, Ts &&... args)
Schedule an event to expire after delay.
Definition: simulator.h:556
static EventId ScheduleNow(FUNC f, Ts &&... args)
Schedule an event to expire Now.
Definition: simulator.h:587
static Time Now(void)
Return the current simulation virtual time.
Definition: simulator.cc:195
Simulation virtual time values and global simulation resolution.
Definition: nstime.h:103
double GetSeconds(void) const
Get an approximation of the time stored in this instance in the indicated unit.
Definition: nstime.h:379
@ S
second
Definition: nstime.h:114
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:432
a unique identifier for an interface.
Definition: type-id.h:59
TypeId SetParent(TypeId tid)
Set the parent TypeId.
Definition: type-id.cc:922
double GetValue(double min, double max)
Get the next random value, as a double in the specified range .
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:205
#define NS_LOG_DEBUG(msg)
Use NS_LOG to output a message of level LOG_DEBUG.
Definition: log.h:273
#define NS_LOG_LOGIC(msg)
Use NS_LOG to output a message of level LOG_LOGIC.
Definition: log.h:289
#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:106
@ CHANNEL_ACCESS_FAILURE
CHANNEL_ACCESS_FAILURE.
Definition: lr-wpan-mac.h:75
@ MAC_CSMA_DEFERRED
MAC_CSMA_DEFERRED.
Definition: lr-wpan-mac.h:80
@ CHANNEL_IDLE
CHANNEL_IDLE.
Definition: lr-wpan-mac.h:76
@ IEEE_802_15_4_PHY_IDLE
Definition: lr-wpan-phy.h:111
#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:1244
Every class exported by the ns3 library is enclosed in the ns3 namespace.
mac
Definition: third.py:99