tcp-westwood-nr.h

NS2 simulation TCP westwood

/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
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 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
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 * @(#) $Header: /mvalla/tcp-w-nr.h,v 1.0 2001/09/17 15:14:54 mvalla Exp mvalla $ (LBL)
 */

#ifndef tcp_w_nr_h
#define tcp_w_nr_h

#include "tcp.h"

/* these are bits for how to change the cwnd and ssthresh values */
/* used by TCP-W						 */
#define CLOSE_FASTER	0x00000400

/* TCP Westwood New Reno */

class WestwoodNRTcpAgent : public virtual NewRenoTcpAgent {
public:
	WestwoodNRTcpAgent();
	virtual void recv(Packet *pkt, Handler*);
	virtual void dupack_action();
	virtual void timeout (int tno);
	
	/* these where originally in class TcpAgent (file: tcp.h) */
	virtual void slowdown(int how);
	virtual void newack(Packet* pkt);
	
	virtual int  delay_bind_dispatch(const char *varName, const char *localName, TclObject *tracer);

protected:
	double lastackno_;  /* Last ACK number */
	double lastackrx_;  /* Time last ACK was received */ 
	double fr_alpha_;   /* exponential averaging coefficient */
	int filter_type_;   /* exponential filter type */
	double tau_;        /* time constant used in filter 3 */
	double west_type_;
	double qest_;
	double total_time_;
	double total_size_;
	double fr_amin_;
	double fr_amax_;
	double fr_prev_;
	int interp_type_;
//used to overcome the effect of congestion on the ACK path
	double last_ts_;
	double last_echoed_ts_;
	double current_ts_;
	double current_echoed_ts_;
	int last_seq_;
	double last_cwnd_;
	int openadd_;

	/* these where originally in class TcpAgent (file: tcp.h) */
 	int mss_;       	/* Maximum Segment Size - MGM+CC 31/08/2000 */
	double current_bwe_;    /* Current Bandwidth estimation */
        double last_bwe_sample_;/* Last sample used to compute BWE */
        int unaccounted_;       /* unaccounted ACKs already received */
        double fr_a_;           /* bandwidth reduction factor */
        double min_rtt_estimate;/* smaller recorded RTT estimate */
        TracedInt myseqno_;     /* my own exportable copy of seqno */
        
        virtual void bwe_computation(Packet *pkt);
	
};

#endif /* tcp_w_nr_h */