tcp-westwood-plus.h

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/*
 * Copyright (c) 2013 ResiliNets, ITTC, University of Kansas
 *
 * 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: Siddharth Gangadhar <siddharth@ittc.ku.edu>, Truc Anh N. Nguyen <annguyen@ittc.ku.edu>,
 * and Greeshma Umapathi
 *
 * James P.G. Sterbenz <jpgs@ittc.ku.edu>, director
 * ResiliNets Research Group  https://resilinets.org/
 * Information and Telecommunication Technology Center (ITTC)
 * and Department of Electrical Engineering and Computer Science
 * The University of Kansas Lawrence, KS USA.
 *
 * Work supported in part by NSF FIND (Future Internet Design) Program
 * under grant CNS-0626918 (Postmodern Internet Architecture),
 * NSF grant CNS-1050226 (Multilayer Network Resilience Analysis and Experimentation on GENI),
 * US Department of Defense (DoD), and ITTC at The University of Kansas.
 */
 
#ifndef TCP_WESTWOOD_H
#define TCP_WESTWOOD_H
 
#include "tcp-congestion-ops.h"
 
#include "ns3/data-rate.h"
#include "ns3/event-id.h"
#include "ns3/tcp-recovery-ops.h"
#include "ns3/traced-value.h"
 
namespace ns3
{
 
class Time;
 
class TcpWestwoodPlus : public TcpNewReno
{
  public:
    static TypeId GetTypeId();
 
    TcpWestwoodPlus();
    TcpWestwoodPlus(const TcpWestwoodPlus& sock);
    ~TcpWestwoodPlus() override;
 
    enum FilterType
    {
        NONE,
        TUSTIN
    };
 
    uint32_t GetSsThresh(Ptr<const TcpSocketState> tcb, uint32_t bytesInFlight) override;
 
    void PktsAcked(Ptr<TcpSocketState> tcb, uint32_t packetsAcked, const Time& rtt) override;
 
    Ptr<TcpCongestionOps> Fork() override;
 
  private:
    void UpdateAckedSegments(int acked);
 
    void EstimateBW(const Time& rtt, Ptr<TcpSocketState> tcb);
 
  protected:
    TracedValue<DataRate> m_currentBW; 
    DataRate m_lastSampleBW;           
    DataRate m_lastBW;                 
    FilterType m_fType;                
 
    uint32_t m_ackedSegments;  
    bool m_IsCount;            
    EventId m_bwEstimateEvent; 
    Time m_lastAck;            
};
 
} // namespace ns3
 
#endif /* TCP_WESTWOOD_H */