asyncsnrdecider.cc

基于omnet++开发的Mf框架下的802.11协议仿真。

/* -*- mode:c++ -*- ********************************************************
 * file:        AsyncSnrDecider.cc
 *
 * author:      Yupeng.hu
 *
 * copyright:   (C) 2006 HUNAN Universtiy, ChangSha China
 *
 ***************************************************************************
 * part of:     Async Simulation
 * description: - Async Description
 *
 ***************************************************************************
 * changelog:   $Revision$
 *              last modified:   $Date: 2006-7-13 13:02 $
 *              by:              $Author: Yupeng.hu $
 ***************************************************************************/
 
 
#include "AsyncSnrDecider.h"
#include <AirFrame_m.h>

#include <FWMath.h>


#define EV (ev.disabled()||!debug) ? (std::ostream&)ev : ev << logName() << "::AsyncSnrDecider: "

Define_Module(AsyncSnrDecider);

void AsyncSnrDecider::initialize(int stage)
{
    BasicDecider::initialize(stage);

    if(stage==0){
      snrThresholdLevel=FWMath::dBm2mW(par("snrThresholdLevel"));
    }
}


/**
   Checks the received sduList (from the PhySDU header) if it contains an
   snr level above the threshold
*/
bool AsyncSnrDecider::snrOverThreshold(SnrList &snrlist) const
{
  //check the entries in the sduList if a level is lower than the
  //acceptable minimum:  
  for(SnrList::const_iterator iter=snrlist.begin(); iter!=snrlist.end();iter++){
    if(iter->snr<=snrThresholdLevel){
      EV <<"Message got lost. MessageSnr: "<<iter->snr<<" Threshold: "<<snrThresholdLevel<<endl;
      return false;
    }
  }
  return true;
}

void AsyncSnrDecider::handleLowerMsg(AirFrame *af, SnrList &receivedList)
{
  if(snrOverThreshold(receivedList)){
    EV <<"Message handed on to Mac\n";
    sendUp(af);
  } 
  else{
    delete af;
  }
}