mac-csma.h

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 Regents of the University of California.
 * All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
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 *    must display the following acknowledgement:
 *  This product includes software developed by the Daedalus Research
 *  Group at the University of California Berkeley.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
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 *
 * Contributed by Giao Nguyen, http://daedalus.cs.berkeley.edu/~gnguyen
 *
 * @(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/mac/mac-csma.h,v 1.16 1998/08/12 23:41:07 gnguyen Exp $ (UCB)
 */

#ifndef ns_mac_csma_h
#define ns_mac_csma_h

#include "mac.h"

/*
// Carrier Sense Multiple Access MAC
*/

class MacCsma;

class MacHandlerEoc : public Handler {
public:
    MacHandlerEoc(MacCsma* m) : mac_(m) {}
    void handle(Event* e);
protected:
    MacCsma* mac_;
};


class MacCsma : public Mac {
public:
    MacCsma();
    virtual void send(Packet* p);
    virtual void resume(Packet* p = 0);
    virtual void endofContention(Packet* p);

protected:
    virtual void backoff(Handler* h, Packet* p, double delay=0);
    double txstart_;    // when the transmission starts
    double ifs_;        // interframe spacing
    double slotTime_;   // duration of contention slot in seconds
    int cw_;        // current contention window
    int cwmin_;     // minimum contention window for 1st backoff
    int cwmax_;     // maximum contention window (backoff range)
    int rtx_;       // number of retransmission attempt
    int rtxLimit_;      // maximum number of retransmission attempt
    int csense_;        // carrier sense or not
    Event eEoc_;        // event at the end-of-contention
    MacHandlerEoc hEoc_;    // handle end-of-contention
};


class MacCsmaCd : public MacCsma {
public:
    void endofContention(Packet*);
};


class MacCsmaCa : public MacCsma {
public:
    virtual void send(Packet*);
};

#endif

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