wifi-default-protection-manager.h

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/*
 * Copyright (c) 2020 Universita' degli Studi di Napoli Federico II
 *
 * 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: Stefano Avallone <stavallo@unina.it>
 */
 
#ifndef WIFI_DEFAULT_PROTECTION_MANAGER_H
#define WIFI_DEFAULT_PROTECTION_MANAGER_H
 
#include "wifi-protection-manager.h"
 
namespace ns3
{
 
class WifiTxParameters;
class WifiMpdu;
class WifiMacHeader;
 
/**
 * \ingroup wifi
 *
 * WifiDefaultProtectionManager is the default protection manager, which selects
 * the protection method for a frame based on its size.
 */
class WifiDefaultProtectionManager : public WifiProtectionManager
{
  public:
    /**
     * \brief Get the type ID.
     * \return the object TypeId
     */
    static TypeId GetTypeId();
 
    WifiDefaultProtectionManager();
    ~WifiDefaultProtectionManager() override;
 
    std::unique_ptr<WifiProtection> TryAddMpdu(Ptr<const WifiMpdu> mpdu,
                                               const WifiTxParameters& txParams) override;
    std::unique_ptr<WifiProtection> TryAggregateMsdu(Ptr<const WifiMpdu> msdu,
                                                     const WifiTxParameters& txParams) override;
 
  protected:
    /**
     * Select the protection method for a single PSDU.
     *
     * \param hdr the MAC header of the PSDU
     * \param size the size in bytes of the PSDU
     * \param txVector the TxVector used to transmit the PSDU
     * \return the selected protection method
     */
    virtual std::unique_ptr<WifiProtection> GetPsduProtection(const WifiMacHeader& hdr,
                                                              uint32_t size,
                                                              const WifiTxVector& txVector) const;
 
  private:
    /**
     * Calculate the protection method to use if the given MPDU is added to the
     * current DL MU PPDU (represented by the given TX parameters). If the computed
     * protection method is the same as the current one, a null pointer is
     * returned. Otherwise, the computed protection method is returned.
     * The TX width of the PPDU containing the MU-RTS is the same as the DL MU PPDU
     * being protected. Each non-AP station is solicited to transmit a CTS occupying a
     * bandwidth equal to the minimum between the TX width of the DL MU PPDU and the
     * maximum channel width supported by the non-AP station.
     *
     * \param mpdu the given MPDU
     * \param txParams the TX parameters describing the current DL MU PPDU
     * \return the new protection method or a null pointer if the protection method
     *         is unchanged
     */
    virtual std::unique_ptr<WifiProtection> TryAddMpduToMuPpdu(Ptr<const WifiMpdu> mpdu,
                                                               const WifiTxParameters& txParams);
 
    /**
     * Calculate the protection method for the UL MU transmission solicited by the given
     * Trigger Frame.
     * The TX width of the PPDU containing the MU-RTS is the same as the TB PPDUs being
     * solicited by the given Trigger Frame. Each non-AP station is solicited to transmit a CTS
     * occupying a bandwidth equal to the minimum between the TX width of the PPDU containing
     * the MU-RTS and the maximum channel width supported by the non-AP station.
     *
     * \param mpdu the given Trigger Frame
     * \param txParams the current TX parameters (just the TXVECTOR needs to be set)
     * \return the protection method for the UL MU transmission solicited by the given Trigger Frame
     */
    virtual std::unique_ptr<WifiProtection> TryUlMuTransmission(Ptr<const WifiMpdu> mpdu,
                                                                const WifiTxParameters& txParams);
 
    bool m_sendMuRts; //!< true for sending an MU-RTS to protect DL MU PPDUs
};
 
} // namespace ns3
 
#endif /* WIFI_DEFAULT_PROTECTION_MANAGER_H */