double
LogRuleDownlinkPacketScheduler::ComputeSchedulingMetric (RadioBearer *bearer, double spectralEfficiency, int subChannel)
{
double metric;
if ((bearer->GetApplication ()->GetApplicationType () == Application::APPLICATION_TYPE_INFINITE_BUFFER)
||
(bearer->GetApplication ()->GetApplicationType () == Application::APPLICATION_TYPE_CBR))
{
metric = (spectralEfficiency * 180000.)
/
bearer->GetAverageTransmissionRate();
}
else
{
QoSParameters *qos = bearer->GetQoSParameters ();
double HOL = bearer->GetHeadOfLinePacketDelay ();
double targetDelay = qos->GetMaxDelay ();
//COMPUTE METRIC USING EXP RULE:
double logTerm = log (1.1 + ( (5 * HOL) / targetDelay ));
double weight = (spectralEfficiency * 180000.)
/
bearer->GetAverageTransmissionRate();
metric = logTerm * weight;
}
return metric;
}
double
MwRulePacketScheduler::ComputeSchedulingMetric (RadioBearer *bearer, double spectralEfficiency, int subChannel)
{
#ifdef SCHEDULER_DEBUG
std::cout << "\t ComputeSchedulingMetric for flow "
<< bearer->GetApplication ()->GetApplicationID () << std::endl;
#endif
double metric;
if ((bearer->GetApplication ()->GetApplicationType () == Application::APPLICATION_TYPE_INFINITE_BUFFER)
||
(bearer->GetApplication ()->GetApplicationType () == Application::APPLICATION_TYPE_CBR))
{
metric = (spectralEfficiency * 180000.)
/
bearer->GetAverageTransmissionRate();
#ifdef SCHEDULER_DEBUG
std::cout << "\t\t non real time flow: metric = " << metric << std::endl;
#endif
}
else
{
QoSParameters *qos = bearer->GetQoSParameters ();
double HOL = bearer->GetHeadOfLinePacketDelay ();
double targetDelay = qos->GetMaxDelay ();
#ifdef SCHEDULER_DEBUG
std::cout << "\t\t real time flow: HOL = " << HOL << ", target delay = " << targetDelay;
#endif
//compute sum of HOL and average spectral efficiency
//#ifdef SCHEDULER_DEBUG
// std::cout << "\n\t\t\t compute sum HOL for all real time flows"<< std::endl;
//#endif
double sumHOL = 0;
int nbFlows = 0;
FlowsToSchedule *flowsToSchedule = GetFlowsToSchedule ();
FlowsToSchedule::iterator iter;
FlowToSchedule *flow;
for (iter = flowsToSchedule->begin (); iter != flowsToSchedule->end (); iter++)
{
flow = (*iter);
if (!flow->GetBearer ()->HasPackets ())
{}
else
{
if ((flow->GetBearer ()->GetApplication ()->GetApplicationType ()
!= Application::APPLICATION_TYPE_INFINITE_BUFFER)
&&
(flow->GetBearer ()->GetApplication ()->GetApplicationType ()
!= Application::APPLICATION_TYPE_CBR))
{
sumHOL += flow->GetBearer ()->GetHeadOfLinePacketDelay ();
nbFlows++;
//#ifdef SCHEDULER_DEBUG
// std::cout << "\t\t\t --> HOL for flow " << flow->GetBearer ()->GetApplication ()->GetApplicationID ()
// << " = " << flow->GetBearer ()->GetHeadOfLinePacketDelay ()<< std::endl;
//#endif
}
else
{
//#ifdef SCHEDULER_DEBUG
// std::cout << "\t\t\t --> non real time flow, go on! " << std::endl;
//#endif
}
}
}
//COMPUTE METRIC USING EXP RULE:
double numerator = (6/targetDelay) * HOL;
double denominator = (1 + sqrt (sumHOL/nbFlows));
double weight = (spectralEfficiency * 180000.)
/
bearer->GetAverageTransmissionRate();
metric = (exp (numerator / denominator)) * weight;
#ifdef SCHEDULER_DEBUG
std::cout << " --> metric = " << metric << std::endl;
#endif
}
return metric;
}