/*

 * Copyright (c) 2009 CTTC

 *

 * 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: Nicola Baldo <nbaldo@cttc.es>

 */

#ifndef SPECTRUM_CHANNEL_H

#define SPECTRUM_CHANNEL_H

#include <ns3/object.h>

#include <ns3/nstime.h>

#include <ns3/channel.h>

#include <ns3/spectrum-type.h>

namespace ns3 {

class PacketBurst;

class SpectrumValue;

class SpectrumPhy;

class SpectrumPropagationLossModel;

class PropagationLossModel;

class PropagationDelayModel;

/**

 * \ingroup spectrum

 *

 * Defines the interface for spectrum-aware channel implementations

 *

 */

class SpectrumChannel : public Channel

{

public:

  virtual ~SpectrumChannel ();

  static TypeId GetTypeId (void);

  /**

   * set the single-frequency propagation loss model to be used

   * \warning only models that do not depend on the TX power should be used.

   * 

   * \param loss a pointer to the propagation loss model to be used.

   */

  virtual void AddPropagationLossModel (Ptr<PropagationLossModel> loss) = 0;

  /**

   * set the frequency-dependent propagation loss model to be used

   * \param loss a pointer to the propagation loss model to be used.

   */

  virtual void AddSpectrumPropagationLossModel (Ptr<SpectrumPropagationLossModel> loss) = 0;

  /**

   * set the  propagation delay model to be used

   * \param delay Ptr to the propagation delay model to be used.

   */

  virtual void SetPropagationDelayModel (Ptr<PropagationDelayModel> delay) = 0;

  /**

   * Used by attached PHY instances to transmit waveforms on the channel

   *

   * @param p the PacketBurst associated with the waveform being transmitted

   * @param txPsd the Power Spectral Density of the

   * waveform, in linear units. The exact unit will depend on the

   * type of transmission medium involved: W for radio communications, Pa for

   * underwater acoustic communications. Other transmission media to be defined.

   * @param st spectrum type

   * @param duration duration of the packet transmission. It is

   * assumed that the Power Spectral Density remains constant for the

   * whole duration of the transmission. In other words, all waveform

   * have a rect shape with respect to time.

   * @param sender the SpectrumPhy instance making this function call

   */

  virtual void StartTx (Ptr<PacketBurst> p, Ptr <SpectrumValue> txPsd, SpectrumType st, Time duration, Ptr<SpectrumPhy> sender) = 0;

  /**

   * @brief add a SpectrumPhy to a channel, so it can receive packets

   *

   * This method is used to attach a SpectrumPhy instance to a

   * SpectrumChannel instance, so that the SpectrumPhy can receive

   * packets sent on that channel. Note that a SpectrumPhy that only

   * transmits (without receiveing ever) does not need to be added to

   * the channel.

   *

   * This method is to be implemented by all classes inheriting from

   * SpectrumChannel.

   *

   * @param phy the SpectrumPhy instance to be added to the channel as

   * a receiver.

   */

  virtual void AddRx (Ptr<SpectrumPhy> phy) = 0;

};

}

#endif /* SPECTRUM_CHANNEL_H */