calculate the delay, not -delay.
/* -*- Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
/*
* Copyright (c) 2004,2005,2006 INRIA
*
* 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
*/
#include "mac-stations.h"
#include "arf-mac-stations.h"
#include "ns3/assert.h"
#include "ns3/log.h"
#include "ns3/default-value.h"
NS_LOG_COMPONENT_DEFINE ("Arf");
namespace ns3 {
ArfMacStation::ArfMacStation (ArfMacStations *stations,
int minTimerTimeout,
int minSuccessThreshold)
: m_stations (stations)
{
m_minTimerTimeout = minTimerTimeout;
m_minSuccessThreshold = minSuccessThreshold;
m_successThreshold = m_minSuccessThreshold;
m_timerTimeout = m_minTimerTimeout;
m_rate = GetMinRate ();
m_success = 0;
m_failed = 0;
m_recovery = false;
m_retry = 0;
m_timer = 0;
}
ArfMacStation::~ArfMacStation ()
{}
uint32_t
ArfMacStation::GetMaxRate (void)
{
return GetNSupportedModes ();
}
uint32_t
ArfMacStation::GetMinRate (void)
{
return 0;
}
bool
ArfMacStation::NeedRecoveryFallback (void)
{
if (m_retry == 1)
{
return true;
}
else
{
return false;
}
}
bool
ArfMacStation::NeedNormalFallback (void)
{
int retryMod = (m_retry - 1) % 2;
if (retryMod == 1)
{
return true;
}
else
{
return false;
}
}
void
ArfMacStation::ReportRtsFailed (void)
{}
/**
* It is important to realize that "recovery" mode starts after failure of
* the first transmission after a rate increase and ends at the first successful
* transmission. Specifically, recovery mode transcends retransmissions boundaries.
* Fundamentally, ARF handles each data transmission independently, whether it
* is the initial transmission of a packet or the retransmission of a packet.
* The fundamental reason for this is that there is a backoff between each data
* transmission, be it an initial transmission or a retransmission.
*/
void
ArfMacStation::ReportDataFailed (void)
{
m_timer++;
m_failed++;
m_retry++;
m_success = 0;
if (m_recovery)
{
NS_ASSERT (m_retry >= 1);
if (NeedRecoveryFallback ())
{
ReportRecoveryFailure ();
if (m_rate != GetMinRate ())
{
m_rate--;
}
}
m_timer = 0;
}
else
{
NS_ASSERT (m_retry >= 1);
if (NeedNormalFallback ())
{
ReportFailure ();
if (m_rate != GetMinRate ())
{
m_rate--;
}
}
if (m_retry >= 2)
{
m_timer = 0;
}
}
}
void
ArfMacStation::ReportRxOk (double rxSnr, WifiMode txMode)
{}
void ArfMacStation::ReportRtsOk (double ctsSnr, WifiMode ctsMode, double rtsSnr)
{
NS_LOG_DEBUG ("self="<<this<<" rts ok");
}
void ArfMacStation::ReportDataOk (double ackSnr, WifiMode ackMode, double dataSnr)
{
m_timer++;
m_success++;
m_failed = 0;
m_recovery = false;
m_retry = 0;
NS_LOG_DEBUG ("self="<<this<<" data ok success="<<m_success<<", timer="<<m_timer);
if ((m_success == GetSuccessThreshold () ||
m_timer == GetTimerTimeout ()) &&
(m_rate < (GetMaxRate () - 1)))
{
NS_LOG_DEBUG ("self="<<this<<" inc rate");
m_rate++;
m_timer = 0;
m_success = 0;
m_recovery = true;
}
}
WifiMode
ArfMacStation::GetDataMode (uint32_t size)
{
return GetSupportedMode (m_rate);
}
WifiMode
ArfMacStation::GetRtsMode (void)
{
// XXX: we could/should implement the Arf algorithm for
// RTS only by picking a single rate within the BasicRateSet.
return GetSupportedMode (0);
}
void ArfMacStation::ReportRecoveryFailure (void)
{}
void ArfMacStation::ReportFailure (void)
{}
uint32_t ArfMacStation::GetMinTimerTimeout (void)
{
return m_minTimerTimeout;
}
uint32_t ArfMacStation::GetMinSuccessThreshold (void)
{
return m_minSuccessThreshold;
}
uint32_t ArfMacStation::GetTimerTimeout (void)
{
return m_timerTimeout;
}
uint32_t ArfMacStation::GetSuccessThreshold (void)
{
return m_successThreshold;
}
void ArfMacStation::SetTimerTimeout (uint32_t timerTimeout)
{
NS_ASSERT (timerTimeout >= m_minTimerTimeout);
m_timerTimeout = timerTimeout;
}
void ArfMacStation::SetSuccessThreshold (uint32_t successThreshold)
{
NS_ASSERT (successThreshold >= m_minSuccessThreshold);
m_successThreshold = successThreshold;
}
ArfMacStations *
ArfMacStation::GetStations (void) const
{
return m_stations;
}
ArfMacStations::ArfMacStations (WifiMode defaultTxMode, uint32_t timerThreshold, uint32_t successThreshold)
: MacStations (defaultTxMode),
m_timerThreshold (timerThreshold),
m_successThreshold (successThreshold)
{}
ArfMacStations::~ArfMacStations ()
{}
MacStation *
ArfMacStations::CreateStation (void)
{
return new ArfMacStation (this, m_timerThreshold, m_successThreshold);
}
} // namespace ns3