vht-capabilities.cc

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/*
 * Copyright (c) 2015
 *
 * 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
 *
 * Authors: Ghada Badawy <gbadawy@rim.com>
 *          Sébastien Deronne <sebastien.deronne@gmail.com>
 */
 
#include "vht-capabilities.h"
 
namespace ns3
{
 
VhtCapabilities::VhtCapabilities()
    : m_maxMpduLength(0),
      m_supportedChannelWidthSet(0),
      m_rxLdpc(0),
      m_shortGuardIntervalFor80Mhz(0),
      m_shortGuardIntervalFor160Mhz(0),
      m_txStbc(0),
      m_rxStbc(0),
      m_suBeamformerCapable(0),
      m_suBeamformeeCapable(0),
      m_beamformeeStsCapable(0),
      m_numberOfSoundingDimensions(0),
      m_muBeamformerCapable(0),
      m_muBeamformeeCapable(0),
      m_vhtTxopPs(0),
      m_htcVhtCapable(0),
      m_maxAmpduLengthExponent(0),
      m_vhtLinkAdaptationCapable(0),
      m_rxAntennaPatternConsistency(0),
      m_txAntennaPatternConsistency(0),
      m_rxHighestSupportedLongGuardIntervalDataRate(0),
      m_txHighestSupportedLongGuardIntervalDataRate(0)
{
    m_rxMcsMap.resize(8, 0);
    m_txMcsMap.resize(8, 0);
    for (uint8_t i = 0; i < 8;
         i++) // set to 3 by default, i.e. #spatial streams not supported. 0 means supported up to
              // MCS 7, not what we want to imply at this stage.
    {
        m_rxMcsMap[i] = 3;
        m_txMcsMap[i] = 3;
    }
}
 
WifiInformationElementId
VhtCapabilities::ElementId() const
{
    return IE_VHT_CAPABILITIES;
}
 
uint16_t
VhtCapabilities::GetInformationFieldSize() const
{
    return 12;
}
 
void
VhtCapabilities::SerializeInformationField(Buffer::Iterator start) const
{
    // write the corresponding value for each bit
    start.WriteHtolsbU32(GetVhtCapabilitiesInfo());
    start.WriteHtolsbU64(GetSupportedMcsAndNssSet());
}
 
uint16_t
VhtCapabilities::DeserializeInformationField(Buffer::Iterator start, uint16_t length)
{
    Buffer::Iterator i = start;
    uint32_t vhtinfo = i.ReadLsbtohU32();
    uint64_t mcsset = i.ReadLsbtohU64();
    SetVhtCapabilitiesInfo(vhtinfo);
    SetSupportedMcsAndNssSet(mcsset);
    return length;
}
 
void
VhtCapabilities::SetVhtCapabilitiesInfo(uint32_t ctrl)
{
    m_maxMpduLength = ctrl & 0x03;
    m_supportedChannelWidthSet = (ctrl >> 2) & 0x03;
    m_rxLdpc = (ctrl >> 4) & 0x01;
    m_shortGuardIntervalFor80Mhz = (ctrl >> 5) & 0x01;
    m_shortGuardIntervalFor160Mhz = (ctrl >> 6) & 0x01;
    m_txStbc = (ctrl >> 7) & 0x01;
    m_rxStbc = (ctrl >> 8) & 0x07;
    m_suBeamformerCapable = (ctrl >> 11) & 0x01;
    m_suBeamformeeCapable = (ctrl >> 12) & 0x01;
    m_beamformeeStsCapable = (ctrl >> 13) & 0x07;
    m_numberOfSoundingDimensions = (ctrl >> 16) & 0x07;
    m_muBeamformerCapable = (ctrl >> 19) & 0x01;
    m_muBeamformeeCapable = (ctrl >> 20) & 0x01;
    m_vhtTxopPs = (ctrl >> 21) & 0x01;
    m_htcVhtCapable = (ctrl >> 22) & 0x01;
    m_maxAmpduLengthExponent = (ctrl >> 23) & 0x07;
    m_vhtLinkAdaptationCapable = (ctrl >> 26) & 0x03;
    m_rxAntennaPatternConsistency = (ctrl >> 28) & 0x01;
    m_txAntennaPatternConsistency = (ctrl >> 29) & 0x01;
}
 
uint32_t
VhtCapabilities::GetVhtCapabilitiesInfo() const
{
    uint32_t val = 0;
    val |= m_maxMpduLength & 0x03;
    val |= (m_supportedChannelWidthSet & 0x03) << 2;
    val |= (m_rxLdpc & 0x01) << 4;
    val |= (m_shortGuardIntervalFor80Mhz & 0x01) << 5;
    val |= (m_shortGuardIntervalFor160Mhz & 0x01) << 6;
    val |= (m_txStbc & 0x01) << 7;
    val |= (m_rxStbc & 0x07) << 8;
    val |= (m_suBeamformerCapable & 0x01) << 11;
    val |= (m_suBeamformeeCapable & 0x01) << 12;
    val |= (m_beamformeeStsCapable & 0x07) << 13;
    val |= (m_numberOfSoundingDimensions & 0x07) << 16;
    val |= (m_muBeamformerCapable & 0x01) << 19;
    val |= (m_muBeamformeeCapable & 0x01) << 20;
    val |= (m_vhtTxopPs & 0x01) << 21;
    val |= (m_htcVhtCapable & 0x01) << 22;
    val |= (m_maxAmpduLengthExponent & 0x07) << 23;
    val |= (m_vhtLinkAdaptationCapable & 0x03) << 26;
    val |= (m_rxAntennaPatternConsistency & 0x01) << 28;
    val |= (m_txAntennaPatternConsistency & 0x01) << 29;
    return val;
}
 
void
VhtCapabilities::SetSupportedMcsAndNssSet(uint64_t ctrl)
{
    uint16_t n;
    for (uint8_t i = 0; i < 8; i++)
    {
        n = i * 2;
        m_rxMcsMap[i] = (ctrl >> n) & 0x03;
    }
    m_rxHighestSupportedLongGuardIntervalDataRate = (ctrl >> 16) & 0x1fff;
    for (uint8_t i = 0; i < 8; i++)
    {
        n = (i * 2) + 32;
        m_txMcsMap[i] = (ctrl >> n) & 0x03;
    }
    m_txHighestSupportedLongGuardIntervalDataRate = (ctrl >> 48) & 0x1fff;
}
 
uint64_t
VhtCapabilities::GetSupportedMcsAndNssSet() const
{
    uint64_t val = 0;
    uint16_t n;
    for (uint8_t i = 0; i < 8; i++)
    {
        n = i * 2;
        val |= (static_cast<uint64_t>(m_rxMcsMap[i]) & 0x03) << n;
    }
    val |= (static_cast<uint64_t>(m_rxHighestSupportedLongGuardIntervalDataRate) & 0x1fff) << 16;
    for (uint8_t i = 0; i < 8; i++)
    {
        n = (i * 2) + 32;
        val |= (static_cast<uint64_t>(m_txMcsMap[i]) & 0x03) << n;
    }
    val |= (static_cast<uint64_t>(m_txHighestSupportedLongGuardIntervalDataRate) & 0x1fff) << 48;
    return val;
}
 
void
VhtCapabilities::SetMaxMpduLength(uint16_t length)
{
    NS_ABORT_MSG_IF(length != 3895 && length != 7991 && length != 11454,
                    "Invalid MPDU Max Length value");
    if (length == 11454)
    {
        m_maxMpduLength = 2;
    }
    else if (length == 7991)
    {
        m_maxMpduLength = 1;
    }
    else
    {
        m_maxMpduLength = 0;
    }
}
 
void
VhtCapabilities::SetSupportedChannelWidthSet(uint8_t channelWidthSet)
{
    m_supportedChannelWidthSet = channelWidthSet;
}
 
void
VhtCapabilities::SetRxLdpc(uint8_t rxLdpc)
{
    m_rxLdpc = rxLdpc;
}
 
void
VhtCapabilities::SetShortGuardIntervalFor80Mhz(uint8_t shortGuardInterval)
{
    m_shortGuardIntervalFor80Mhz = shortGuardInterval;
}
 
void
VhtCapabilities::SetShortGuardIntervalFor160Mhz(uint8_t shortGuardInterval)
{
    m_shortGuardIntervalFor160Mhz = shortGuardInterval;
}
 
void
VhtCapabilities::SetRxStbc(uint8_t rxStbc)
{
    m_rxStbc = rxStbc;
}
 
void
VhtCapabilities::SetTxStbc(uint8_t txStbc)
{
    m_txStbc = txStbc;
}
 
void
VhtCapabilities::SetMaxAmpduLength(uint32_t maxampdulength)
{
    for (uint8_t i = 0; i <= 7; i++)
    {
        if ((1UL << (13 + i)) - 1 == maxampdulength)
        {
            m_maxAmpduLengthExponent = i;
            return;
        }
    }
    NS_ABORT_MSG("Invalid A-MPDU Max Length value");
}
 
void
VhtCapabilities::SetRxMcsMap(uint8_t mcs, uint8_t nss)
{
    // MCS index should be at least 7 and should not exceed 9
    NS_ASSERT(mcs >= 7 && mcs <= 9);
    m_rxMcsMap[nss - 1] = mcs - 7; // 1 = MCS 8; 2 = MCS 9
}
 
void
VhtCapabilities::SetTxMcsMap(uint8_t mcs, uint8_t nss)
{
    // MCS index should be at least 7 and should not exceed 9
    NS_ASSERT(mcs >= 7 && mcs <= 9);
    m_txMcsMap[nss - 1] = mcs - 7; // 1 = MCS 8; 2 = MCS 9
}
 
bool
VhtCapabilities::IsSupportedTxMcs(uint8_t mcs) const
{
    NS_ASSERT(mcs >= 0 && mcs <= 9);
    if (mcs <= 7)
    {
        return true;
    }
    if (mcs == 8 && (m_txMcsMap[0] == 1 || m_txMcsMap[0] == 2))
    {
        return true;
    }
    if (mcs == 9 && m_txMcsMap[0] == 2)
    {
        return true;
    }
    return false;
}
 
bool
VhtCapabilities::IsSupportedRxMcs(uint8_t mcs) const
{
    NS_ASSERT(mcs >= 0 && mcs <= 9);
    if (mcs <= 7)
    {
        return true;
    }
    if (mcs == 8 && (m_rxMcsMap[0] == 1 || m_rxMcsMap[0] == 2))
    {
        return true;
    }
    if (mcs == 9 && m_rxMcsMap[0] == 2)
    {
        return true;
    }
    return false;
}
 
void
VhtCapabilities::SetRxHighestSupportedLgiDataRate(uint16_t supportedDatarate)
{
    m_rxHighestSupportedLongGuardIntervalDataRate = supportedDatarate;
}
 
void
VhtCapabilities::SetTxHighestSupportedLgiDataRate(uint16_t supportedDatarate)
{
    m_txHighestSupportedLongGuardIntervalDataRate = supportedDatarate;
}
 
uint16_t
VhtCapabilities::GetMaxMpduLength() const
{
    if (m_maxMpduLength == 0)
    {
        return 3895;
    }
    if (m_maxMpduLength == 1)
    {
        return 7991;
    }
    if (m_maxMpduLength == 2)
    {
        return 11454;
    }
    NS_ABORT_MSG("The value 3 is reserved");
}
 
uint8_t
VhtCapabilities::GetSupportedChannelWidthSet() const
{
    return m_supportedChannelWidthSet;
}
 
uint8_t
VhtCapabilities::GetRxLdpc() const
{
    return m_rxLdpc;
}
 
uint8_t
VhtCapabilities::GetRxStbc() const
{
    return m_rxStbc;
}
 
uint8_t
VhtCapabilities::GetTxStbc() const
{
    return m_txStbc;
}
 
uint32_t
VhtCapabilities::GetMaxAmpduLength() const
{
    return (1UL << (13 + m_maxAmpduLengthExponent)) - 1;
}
 
bool
VhtCapabilities::IsSupportedMcs(uint8_t mcs, uint8_t nss) const
{
    // The MCS index starts at 0 and NSS starts at 1
    if (mcs <= 7 && m_rxMcsMap[nss - 1] < 3)
    {
        return true;
    }
    if (mcs == 8 && m_rxMcsMap[nss - 1] > 0 && m_rxMcsMap[nss - 1] < 3)
    {
        return true;
    }
    if (mcs == 9 && m_rxMcsMap[nss - 1] == 2)
    {
        return true;
    }
    return false;
}
 
uint16_t
VhtCapabilities::GetRxHighestSupportedLgiDataRate() const
{
    return m_rxHighestSupportedLongGuardIntervalDataRate;
}
 
std::ostream&
operator<<(std::ostream& os, const VhtCapabilities& vhtCapabilities)
{
    os << vhtCapabilities.GetVhtCapabilitiesInfo() << "|"
       << vhtCapabilities.GetSupportedMcsAndNssSet();
 
    return os;
}
 
} // namespace ns3