src/wifi/model/arf-wifi-manager.cc
author Peter D. Barnes, Jr. <barnes26@llnl.gov>
Wed, 03 Jul 2013 14:43:10 -0700
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child 10139 17a71cd49da3
permissions -rw-r--r--
Doxygenate todo's
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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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 * Copyright (c) 2004,2005,2006 INRIA
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation;
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 * Author: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
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 */
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#include "arf-wifi-manager.h"
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#include "ns3/assert.h"
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#include "ns3/log.h"
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#include "ns3/uinteger.h"
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NS_LOG_COMPONENT_DEFINE ("ns3::ArfWifiManager");
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namespace ns3 {
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struct ArfWifiRemoteStation : public WifiRemoteStation
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{
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  uint32_t m_timer;
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  uint32_t m_success;
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  uint32_t m_failed;
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  bool m_recovery;
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  uint32_t m_retry;
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  uint32_t m_timerTimeout;
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  uint32_t m_successThreshold;
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  uint32_t m_rate;
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};
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NS_OBJECT_ENSURE_REGISTERED (ArfWifiManager);
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TypeId
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ArfWifiManager::GetTypeId (void)
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{
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  static TypeId tid = TypeId ("ns3::ArfWifiManager")
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    .SetParent<WifiRemoteStationManager> ()
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    .AddConstructor<ArfWifiManager> ()
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    .AddAttribute ("TimerThreshold", "The 'timer' threshold in the ARF algorithm.",
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                   UintegerValue (15),
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                   MakeUintegerAccessor (&ArfWifiManager::m_timerThreshold),
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                   MakeUintegerChecker<uint32_t> ())
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    .AddAttribute ("SuccessThreshold",
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                   "The minimum number of sucessfull transmissions to try a new rate.",
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                   UintegerValue (10),
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                   MakeUintegerAccessor (&ArfWifiManager::m_successThreshold),
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                   MakeUintegerChecker<uint32_t> ())
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  ;
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  return tid;
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}
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ArfWifiManager::ArfWifiManager ()
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{
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  NS_LOG_FUNCTION (this);
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}
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ArfWifiManager::~ArfWifiManager ()
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{
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  NS_LOG_FUNCTION (this);
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}
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WifiRemoteStation *
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ArfWifiManager::DoCreateStation (void) const
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{
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  NS_LOG_FUNCTION (this);
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  ArfWifiRemoteStation *station = new ArfWifiRemoteStation ();
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  station->m_successThreshold = m_successThreshold;
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  station->m_timerTimeout = m_timerThreshold;
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  station->m_rate = 0;
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  station->m_success = 0;
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  station->m_failed = 0;
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  station->m_recovery = false;
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  station->m_retry = 0;
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  station->m_timer = 0;
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  return station;
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}
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void
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ArfWifiManager::DoReportRtsFailed (WifiRemoteStation *station)
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{
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  NS_LOG_FUNCTION (this << station);
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}
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/**
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 * It is important to realize that "recovery" mode starts after failure of
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 * the first transmission after a rate increase and ends at the first successful
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 * transmission. Specifically, recovery mode transcends retransmissions boundaries.
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 * Fundamentally, ARF handles each data transmission independently, whether it
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 * is the initial transmission of a packet or the retransmission of a packet.
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 * The fundamental reason for this is that there is a backoff between each data
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 * transmission, be it an initial transmission or a retransmission.
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 */
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void
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ArfWifiManager::DoReportDataFailed (WifiRemoteStation *st)
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{
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  NS_LOG_FUNCTION (this << st);
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  ArfWifiRemoteStation *station = (ArfWifiRemoteStation *)st;
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  station->m_timer++;
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  station->m_failed++;
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  station->m_retry++;
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  station->m_success = 0;
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  if (station->m_recovery)
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    {
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      NS_ASSERT (station->m_retry >= 1);
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      if (station->m_retry == 1)
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        {
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          // need recovery fallback
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          if (station->m_rate != 0)
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            {
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              station->m_rate--;
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            }
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        }
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      station->m_timer = 0;
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    }
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  else
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    {
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      NS_ASSERT (station->m_retry >= 1);
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      if (((station->m_retry - 1) % 2) == 1)
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        {
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          // need normal fallback
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          if (station->m_rate != 0)
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            {
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              station->m_rate--;
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            }
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        }
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      if (station->m_retry >= 2)
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        {
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          station->m_timer = 0;
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        }
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    }
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}
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void
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ArfWifiManager::DoReportRxOk (WifiRemoteStation *station,
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                              double rxSnr, WifiMode txMode)
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{
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  NS_LOG_FUNCTION (this << station << rxSnr << txMode);
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}
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void ArfWifiManager::DoReportRtsOk (WifiRemoteStation *station,
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                                    double ctsSnr, WifiMode ctsMode, double rtsSnr)
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{
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  NS_LOG_FUNCTION (this << station << ctsSnr << ctsMode << rtsSnr);
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  NS_LOG_DEBUG ("station=" << station << " rts ok");
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}
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void ArfWifiManager::DoReportDataOk (WifiRemoteStation *st,
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                                     double ackSnr, WifiMode ackMode, double dataSnr)
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{
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  NS_LOG_FUNCTION (this << st << ackSnr << ackMode << dataSnr);
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  ArfWifiRemoteStation *station = (ArfWifiRemoteStation *) st;
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  station->m_timer++;
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  station->m_success++;
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  station->m_failed = 0;
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  station->m_recovery = false;
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  station->m_retry = 0;
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  NS_LOG_DEBUG ("station=" << station << " data ok success=" << station->m_success << ", timer=" << station->m_timer);
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  if ((station->m_success == m_successThreshold
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       || station->m_timer == m_timerThreshold)
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      && (station->m_rate < (station->m_state->m_operationalRateSet.size () - 1)))
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    {
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      NS_LOG_DEBUG ("station=" << station << " inc rate");
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      station->m_rate++;
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      station->m_timer = 0;
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      station->m_success = 0;
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      station->m_recovery = true;
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    }
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}
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void
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ArfWifiManager::DoReportFinalRtsFailed (WifiRemoteStation *station)
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{
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  NS_LOG_FUNCTION (this << station);
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}
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void
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ArfWifiManager::DoReportFinalDataFailed (WifiRemoteStation *station)
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{
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  NS_LOG_FUNCTION (this << station);
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}
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WifiMode
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ArfWifiManager::DoGetDataMode (WifiRemoteStation *st, uint32_t size)
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{
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  NS_LOG_FUNCTION (this << st << size);
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  ArfWifiRemoteStation *station = (ArfWifiRemoteStation *) st;
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  return GetSupported (station, station->m_rate);
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}
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WifiMode
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ArfWifiManager::DoGetRtsMode (WifiRemoteStation *st)
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{
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  NS_LOG_FUNCTION (this << st);
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  /// \todo we could/should implement the Arf algorithm for
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  /// RTS only by picking a single rate within the BasicRateSet.
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  ArfWifiRemoteStation *station = (ArfWifiRemoteStation *) st;
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  return GetSupported (station, 0);
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}
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bool
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ArfWifiManager::IsLowLatency (void) const
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{
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  NS_LOG_FUNCTION (this);
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  return true;
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}
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} // namespace ns3