/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2005 INRIA

 * All rights reserved.

 *

 * 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-parameters.h"

#include "wifi-default-parameters.h"

namespace ns3 {

MacParameters::MacParameters ()

{

  m_rtsCtsThreshold = WifiDefaultParameters::GetRtsCtsThreshold ();

  m_fragmentationThreshold = WifiDefaultParameters::GetFragmentationThreshold ();

  m_maxSsrc = WifiDefaultParameters::GetMaxSsrc ();

  m_maxSlrc = WifiDefaultParameters::GetMaxSlrc ();

  // ensure something not too stupid is set by default.

  NS_ASSERT (WifiDefaultParameters::GetPhyStandard () == WifiDefaultParameters::PHY_STANDARD_80211a);

  uint32_t ctsAckSize = (2 + 2 + 6) * 8; // bits

  double dataRate = (6e6 / 2); // mb/s

  Time delay = Seconds (ctsAckSize / dataRate);

  Initialize (delay, delay);

}

void 

MacParameters::Initialize (Time ctsDelay, Time ackDelay)

{

  NS_ASSERT (WifiDefaultParameters::GetPhyStandard () == WifiDefaultParameters::PHY_STANDARD_80211a);

  // these values are really 802.11a specific

  m_sifs = MicroSeconds (16);

  m_slot = MicroSeconds (9);

  /* see section 9.2.10 ieee 802.11-1999 */

  m_pifs = m_sifs + m_slot;

  // 1000m 

  m_maxPropagationDelay = Seconds (1000.0 / 300000000.0);

  /* Cts_Timeout and Ack_Timeout are specified in the Annex C 

     (Formal description of MAC operation, see details on the 

     Trsp timer setting at page 346)

  */

  m_ctsTimeout = m_sifs;

  m_ctsTimeout += ctsDelay;

  m_ctsTimeout += m_maxPropagationDelay * Scalar (2);

  m_ctsTimeout += m_slot;

  m_ackTimeout = m_sifs;

  m_ackTimeout += ackDelay;

  m_ackTimeout += m_maxPropagationDelay * Scalar (2);

  m_ackTimeout += m_slot;

}

void 

MacParameters::SetSlotTime (Time slotTime)

{

  m_slot = slotTime;

}

Time

MacParameters::GetPifs (void) const

{

  return m_pifs;

}

Time

MacParameters::GetSifs (void) const

{

  return m_sifs;

}

Time

MacParameters::GetSlotTime (void) const

{

  return m_slot;

}

Time

MacParameters::GetCtsTimeout (void) const

{

  return m_ctsTimeout;

}

Time

MacParameters::GetAckTimeout (void) const

{

  return m_ackTimeout;

}

Time

MacParameters::GetBeaconInterval (void) const

{

  return Seconds (1);

}

uint32_t 

MacParameters::GetMaxSsrc (void) const

{

  return m_maxSsrc;

}

uint32_t 

MacParameters::GetMaxSlrc (void) const

{

  return m_maxSlrc;

}

uint32_t 

MacParameters::GetRtsCtsThreshold (void) const

{

  return m_rtsCtsThreshold;

}

uint32_t 

MacParameters::GetFragmentationThreshold (void) const

{

  return m_fragmentationThreshold;

}

Time

MacParameters::GetMsduLifetime (void) const

{

  return Seconds (10);

}

Time

MacParameters::GetMaxPropagationDelay (void) const

{

  return m_maxPropagationDelay;

}

uint32_t 

MacParameters::GetMaxMsduSize (void) const

{

  return 2304;

}

double 

MacParameters::GetCapLimit (void) const

{

  return 0.4;

}

double 

MacParameters::GetMinEdcaTrafficProportion (void) const

{

  return 0.4;

}

}; // namespace ns3