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mac802_11.cpp
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#include"mac802_11.h"
#include"node.h"
#include"math.h"
//#include"random.h"
#include <ctime>
#include <stdio.h>
#define max(a, b) (a > b ? a : b)
double MAC802_11::aSlotTime=20.0e-6;
double MAC802_11::DIFS=50.0e-6;
double MAC802_11::SIFS=10.0e-6;
double MAC802_11::MaxPropagationDelay=1.0e-6;
double MAC802_11::EIFS=aSlotTime+DIFS+144.0e-6+48.0e-6+8.0*14.0/2.0e6;
//double MAC802_11::BasicRate=1.0e6;
double MAC802_11::BasicRate=2.0e6;
//double MAC802_11::DataRate=2.0e6;
double MAC802_11::DataRate=2.0e6;
MAC802_11::MAC802_11()
{
call=0;
NoisePower=1e-13;//-100.0;
InterferencePower=0.0;
macstate=Idle;
PktRecv1=0;
PktRecv2=0;
cw=0;//resetCW();
CWmax=5*CWmin;
tx_active=0;
ShortRetry=0;
LongRetry=0;
BackOffEndTime=0.0;
ExpireTime=0.0;
Pmac=0;
//DontCare2Xmit=1;
RecvPkts=new int[100];
for (int j=0;j<100;j++)
for (int fi=0;fi<100;fi++)
DummyPkt2Send[j][fi]=0;
for (int j=0;j<100;j++)
RecvPkts[j]=0;
for (int fi=0;fi<100;fi++)
{
TotalXmitPkts[fi]=0;
TotalRecvPkts[fi]=0;
TotalDroppedPkts[fi]=0;
AGTReceived[fi]=0;
}
}
void MAC802_11::setscheduler(Scheduler* S)
{
sp=S;
}
void MAC802_11::setnode(node* x, flow* y, int index,int NodeNumber,int FlowNumber)
{
n=x;
f=y;
N=NodeNumber;
F=FlowNumber;
i=index;
}
int MAC802_11:: checkmedium()
{
double TotalNoise= InterferencePower+ NoisePower+getpower(PktRecv1)+getpower(PktRecv2);
if (TotalNoise>CST)
return 1;
else return 0;
}
double MAC802_11::getpower(Packet* p)
{
if (p==0) return 0;
else
{
int id=p->machr.XmitterNodeID;
int j=0;
while(n[j].node_id!=id)
j++;
double d=sqrt((n[i].X-n[j].X)* (n[i].X-n[j].X)+ (n[i].Y-n[j].Y)* (n[i].Y-n[j].Y) +(n[i].Z-n[j].Z)* (n[i].Z-n[j].Z));
//double Prdbm=(Pt-30-30.0*log10(d/0.1));
//return pow(10,Prdbm/10)*1e-3;
double Pt_watt= pow(10,Pt/10)*1e-3;
return Pt_watt*pow((d/0.1),-3);
}
}
void MAC802_11::idle()
{
int TotalBufferOccupancy=0;
int fi;
for (fi=0;fi<F;fi++) TotalBufferOccupancy+=n[i].router.BufferOccupancy[fi];
if(checkmedium()==0&&macstate==Idle&&TotalBufferOccupancy>0)
{ sp->schedule(4,DIFS, n[i].node_id, 0);
macstate=WaitingForDIFS;
}
}
double MAC802_11::resetCW()
{ //srand ( time(NULL) );
int x=rand()/double(RAND_MAX)*CWmin;
if(x<0) x=0;
CWprev= CWmin;
return (double(x)*aSlotTime);
}
double MAC802_11::IncreaseCW(int CWprev)
{ //srand ( time(NULL) );
if(CWprev<CWmax)
CWprev=CWprev*2+1;
int x=rand()/double(RAND_MAX)*CWprev;
if(x<0) x=0;
return (double(x)*aSlotTime);
}
void MAC802_11::sendDATA()
{ //srand ( time(NULL) );
//newly added:flow and link (node selection)
double u=rand()/double(RAND_MAX);
int IndexID=n[i].router.FindSelectedIndex(u);
int FlowID=int(IndexID/N);
int NextNodeID=IndexID%N;
if (n[i].router.BufferOccupancy[FlowID]>0&&n[i].router.RouteCache[FlowID][NextNodeID]>0)
{ //int datasize=546;//1058;
int datasize=1058;
n[i].router.pop(FlowID);
Packet* Pmac=Packet::alloc(datasize);
//Pmac->cmn.size=546;//1058;
Pmac->cmn.size=1058;
Pmac->cmn.ReceivedByReceiver=0;
Pmac->cmn.dummy=0;
Pmac->cmn.error_=0;
if(DummyPkt2Send[NextNodeID][FlowID]==1) Pmac->cmn.dummy=1;
Pmac->packet_type=DATA;
Pmac->machr.flow_id=FlowID ;
Pmac->machr.ReceiverNodeID=NextNodeID;
Pmac->machr.XmitterNodeID=n[i].node_id;
//Pmac->cmn.txtime=txtime(546,DataRate)+txtime(24,BasicRate);
Pmac->cmn.txtime=txtime(1058,DataRate)+txtime(28,BasicRate);
Pmac->packet_type=DATA;
Pmac->machr.duration=SIFS+txtime(14,DataRate)+txtime(28,BasicRate);
macstate=XmittingDATA;
double timeout=txtime(Pmac)+MaxPropagationDelay+SIFS+ txtime(14,DataRate)+txtime(28,BasicRate)+ MaxPropagationDelay;
transmit(Pmac,timeout);
sp->schedule(19, timeout+SIFS,n[i].node_id,(unsigned long int)Pmac); //to delete p;
for(int j=0;j<N;j++)
{ if(n[j].node_id!=n[i].node_id)
n[j].mac.recv(Pmac);
}
}
else
{macstate=Idle;
cw=resetCW();// newly added as if the selected flow is not available then choose new CW
idle();
}
}
void MAC802_11::sendACK(int ReceiverNodeID, int ReceivedFlow)
{
call++;
Packet* p=Packet::alloc();
p->machr.XmitterNodeID=n[i].node_id;
p->cmn.size=42;
p->cmn.txtime=txtime(14,DataRate)+txtime(28,BasicRate);
p->packet_type=ACK;
p->machr.duration=0.0;
if(call==1)
{
p->machr.ReceiverNodeID= ReceiverNodeID;
p->machr.flow_id=ReceivedFlow;
if(macstate==WaitingToXmitACK)
{
macstate=XmittingACK;
double timeout=MaxPropagationDelay;
transmit(p,timeout);
for(int j=0;j<N;j++)
{ if(n[j].node_id!=n[i].node_id)
n[j].mac.recv(p);
}
sp->schedule(19, txtime(p)+1.1*SIFS,n[i].node_id,(unsigned long int)p); //to delete p;
call=0;
}
}
if(call==2)
{
p->machr.ReceiverNodeID2= ReceiverNodeID;
p->machr.flow_id2=ReceivedFlow;
macstate=XmittingACK;
double timeout=MaxPropagationDelay;
transmit(p,timeout);
for(int j=0;j<N;j++)
{ if(n[j].node_id!=n[i].node_id)
n[j].mac.recv(p);
}
sp->schedule(19, txtime(p)+1.1*SIFS,n[i].node_id,(unsigned long int)p); //to delete p;
call=0;
}
}
double MAC802_11::txtime(int PacketSize, double DataRate)
{
return (8.0*PacketSize/DataRate);
}
double MAC802_11::txtime(Packet* p)
{
return p->cmn.txtime;
}
void MAC802_11::transmit(Packet* p, double timeout)
{
tx_active=1;
switch(p->packet_type)
{
case 0:
{ sp->schedule(15,txtime(p),n[i].node_id,0);///Finishing data transmission
sp->schedule(16,timeout,n[i].node_id,(unsigned long int)p);//Time out of reciving ack
break;
}
case 1:
{ sp->schedule(18,txtime(p),n[i].node_id,0);///Finishing ack transmission
break;
}
default: exit(1);
}
}
void MAC802_11::RetransmitDATA(int NodeID, int FlowID,double Rate)
{ macstate=Idle;
LongRetry++;
if(LongRetry>5)
{
LongRetry=0;
cw=resetCW();
//Pmac=0;
ShortRetry=0;//newly added
//TotalDroppedPkts[FlowID]++;//it is not drop for queue overflow
//n[NodeID].router.BufferOccupancy[FlowID]--;/// free the buffer, ie, drop it
double u=rand()/double(RAND_MAX);
double delay =-1/Rate*log(u);
sp->schedule(20,delay,NodeID,(unsigned long int)FlowID);// generate the same packet after a delay
}
else
{cw=IncreaseCW(CWprev);
sp->schedule(20,MaxPropagationDelay,NodeID,(unsigned long int)FlowID);// generate the same packet after a small delay
}
// idle();
}
void MAC802_11::recv(Packet* p)
{
double Pr=getpower(p);
/*if(i==N-1){
for(int j=0;j<N-1;j++)
{
if(n[j].mac.tx_active==1)
cout<<p->machr.ReceiverNodeID<<" "<<p->machr.XmitterNodeID<<" "<<j<<endl;
}
cout<<endl;}*/
if(PktRecv1==0 && PktRecv2==0)
{ if(10*log10(Pr/(InterferencePower+NoisePower))<SINRThreshold(p))
{InterferencePower+=Pr;
sp->schedule(12,txtime(p),n[i].node_id,(unsigned long int)p);
}
else
{PktRecv1=p;
if(tx_active) PktRecv1->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
}
}
else if(PktRecv1==0 || PktRecv2==0)
{if(PktRecv2==0)
{ double Precv1=getpower(PktRecv1);
if(10*log10(Precv1/(InterferencePower+NoisePower+Pr))<SINRThreshold(PktRecv1))
{ InterferencePower+=Precv1;
//sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv);
if(10*log10(Pr/(InterferencePower+NoisePower))<SINRThreshold(p))
{ InterferencePower+=Pr;
PktRecv1=0;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv1);
sp->schedule(12,txtime(p),n[i].node_id, (unsigned long int)p);
}
else
{ PktRecv2=p;
if(tx_active) PktRecv2->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
InterferencePower-=Precv1;
if(10*log10(Precv1/(InterferencePower+NoisePower))<SINRThreshold(PktRecv1))
{
InterferencePower+=Precv1;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv1);
}
/*else
{
if(tx_active) PktRecv1->cmn.error_=1;
sp->schedule(13,ExpireTime-sp->get_clock(),n[i].node_id,(unsigned long int)PktRecv1);
ExpireTime=sp->get_clock()+txtime(p);
}*/
}
}
else
{
if(10*log10(Pr/(InterferencePower+NoisePower))<SINRThreshold(p))
{
InterferencePower+=Pr;
sp->schedule(12,txtime(p),n[i].node_id,(unsigned long int)p);
}
else
{
PktRecv2=p;
if(tx_active) PktRecv2->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
}
}
}
if(PktRecv1==0)
{ double Precv2=getpower(PktRecv2);
if(10*log10(Precv2/(InterferencePower+NoisePower+Pr))<SINRThreshold(PktRecv2))
{ InterferencePower+=Precv2;
//sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv);
if(10*log10(Pr/(InterferencePower+NoisePower))<SINRThreshold(p))
{ InterferencePower+=Pr;
PktRecv2=0;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv2);
sp->schedule(12,txtime(p),n[i].node_id, (unsigned long int)p);
}
else
{ PktRecv1=p;
if(tx_active) PktRecv1->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
InterferencePower-=Precv2;
if(10*log10(Precv2/(InterferencePower+NoisePower))<SINRThreshold(PktRecv2))
{
InterferencePower+=Precv2;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv2);
}
/*else
{
if(tx_active) PktRecv2->cmn.error_=1;
sp->schedule(13,ExpireTime-sp->get_clock(),n[i].node_id,(unsigned long int)PktRecv2);
ExpireTime=sp->get_clock()+txtime(p);
}*/
}
}
else
{
if(10*log10(Pr/(InterferencePower+NoisePower))<SINRThreshold(p))
{
InterferencePower+=Pr;
sp->schedule(12,txtime(p),n[i].node_id,(unsigned long int)p);
}
else
{
PktRecv1=p;
if(tx_active) PktRecv1->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
}
}
}
}
else
{
double Precv1=getpower(PktRecv1);
double Precv2=getpower(PktRecv2);
if(Precv1>Precv2)
{
if(10*log10(Precv1/(InterferencePower+Precv2+NoisePower+Pr))<SINRThreshold(PktRecv1))
{
InterferencePower=InterferencePower+Precv1+Precv2;
if(10*log10(Pr/(InterferencePower+NoisePower))<SINRThreshold(p))
{
InterferencePower+=Pr;
PktRecv1=0;
PktRecv2=0;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv1);
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv2);
sp->schedule(12,txtime(p),n[i].node_id, (unsigned long int)p);
}
else
{
//sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv2);
PktRecv2=p;
if(tx_active) PktRecv2->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
InterferencePower-=Precv1;
if(10*log10(Precv1/(InterferencePower+NoisePower))<SINRThreshold(PktRecv1))
{
InterferencePower+=Precv1;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv1);
}
/*else
{
if(tx_active) PktRecv1->cmn.error_=1;
sp->schedule(13,ExpireTime-sp->get_clock(),n[i].node_id,(unsigned long int)PktRecv1);
ExpireTime=sp->get_clock()+txtime(p);
}*/
}
}
else
{
if(10*log10(Pr/(InterferencePower+NoisePower+Precv2))<SINRThreshold(p))
{
InterferencePower+=Pr;
sp->schedule(12,txtime(p),n[i].node_id,(unsigned long int)p);
if(10*log10(Precv2/(InterferencePower+NoisePower))<SINRThreshold(p))
{
InterferencePower+=Precv2;
sp->schedule(12,txtime(p),n[i].node_id,(unsigned long int)PktRecv2);
}
}
else
{
PktRecv2=p;
if(tx_active) PktRecv2->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
}
}
}
//////////////
else
{
if(10*log10(Precv2/(InterferencePower+Precv1+NoisePower+Pr))<SINRThreshold(PktRecv2))
{
InterferencePower=InterferencePower+Precv2+Precv1;
if(10*log10(Pr/(InterferencePower+NoisePower))<SINRThreshold(p))
{
InterferencePower+=Pr;
PktRecv2=0;
PktRecv1=0;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv2);
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv1);
sp->schedule(12,txtime(p),n[i].node_id, (unsigned long int)p);
}
else
{
//sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv1);
PktRecv1=p;
if(tx_active) PktRecv1->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
InterferencePower-=Precv2;
if(10*log10(Precv2/(InterferencePower+NoisePower))<SINRThreshold(PktRecv2))
{
InterferencePower+=Precv2;
sp->schedule(12,ExpireTime-sp->get_clock(),n[i].node_id, (unsigned long int)PktRecv2);
}
/*else
{
if(tx_active) PktRecv2->cmn.error_=1;
sp->schedule(13,ExpireTime-sp->get_clock(),n[i].node_id,(unsigned long int)PktRecv2);
ExpireTime=sp->get_clock()+txtime(p);
}*/
}
}
else
{
if(10*log10(Pr/(InterferencePower+NoisePower+Precv1))<SINRThreshold(p))
{
InterferencePower+=Pr;
sp->schedule(12,txtime(p),n[i].node_id,(unsigned long int)p);
if(10*log10(Precv1/(InterferencePower+NoisePower))<SINRThreshold(p))
{
InterferencePower+=Precv1;
sp->schedule(12,txtime(p),n[i].node_id,(unsigned long int)PktRecv1);
}
}
else
{
PktRecv1=p;
if(tx_active) PktRecv1->cmn.error_=1;
sp->schedule(13,txtime(p),n[i].node_id,(unsigned long int)p);
ExpireTime=sp->get_clock()+txtime(p);
}
}
}
}
if(macstate==1)
if (checkmedium())
macstate=Idle;
/* if(macstate==3)
if (checkmedium())
{ if (NextDATAXmissionTime>(sp->get_clock()+aSlotTime))
macstate=Idle;
if (NextDATAXmissionTime<=(sp->get_clock()+aSlotTime)&&PktRecv!=0)
PktRecv->cmn.error_=1;
//else DontCare2Xmit=1;
}
*/
if( macstate==2)
if (checkmedium())
{ //macstate=Idle;
double TxRxTime=0;//2.5e-6;
double CCASlotBoundaryTime=aSlotTime-TxRxTime;
if((BackOffEndTime-sp->get_clock())>=CCASlotBoundaryTime)
{
macstate=Idle;
//double ContentionWindow= ceil((BackOffEndTime-sp->get_clock())/aSlotTime);// Since carrier sensing start at the starting of each slot cw=max(0,RemainingTime);
//cw=abs(ContentionWindow)*aSlotTime;
}
if(((BackOffEndTime-sp->get_clock())<CCASlotBoundaryTime))
{
if(PktRecv1!=0) PktRecv1->cmn.error_=1;
if(PktRecv2!=0) PktRecv2->cmn.error_=1;
/*if(PktRecv1!=0 && PktRecv1!=0)
{
PktRecv1->cmn.error_=1;
PktRecv1->cmn.error_=1;
}*/
}
}
}
double MAC802_11::SINRThreshold(Packet* p)
{// if(p->packet_type==0||p->packet_type==1)
// return 12.0;
// return 3.4;
// else return 15.0;
//else
return 6.4;
}
void MAC802_11::recv_timer(Packet* p)
{
if(PktRecv1==p || PktRecv2==p)
{
if(p->cmn.error_)
{//NavEndTime=sp->get_clock()+EIFS;
goto done;
}
if(tx_active)
{//drop(p,MacBusy )
goto done;
}
else
{
switch(p->packet_type)
{ case 0:
recvDATA(p);
break;
case 1:
recvACK(p);
break;
default:
exit(1);
}
}
done:
if(p==PktRecv1)
{
PktRecv1=0;
idle();
}
if(p==PktRecv2)
{
PktRecv2=0;
idle();
}
}
}
void MAC802_11::recvDATA(Packet* p)
{ if(macstate==Idle && p->machr.ReceiverNodeID==n[i].node_id)
{//printf("\nReceived flow:%d \n",p->machr.flow_id);
sp->schedule(17,SIFS,n[i].node_id,(unsigned long int)p);// xmitACK
macstate=WaitingToXmitACK;
ProcessReceivedDATA(p);
}
else if((macstate==WaitingToXmitACK) && p->machr.ReceiverNodeID==n[i].node_id)
{//printf("\nReceived flow:%d \n",p->machr.flow_id);
sp->schedule(17,SIFS,n[i].node_id,(unsigned long int)p);// xmitACK
macstate=WaitingToXmitACK2;
ProcessReceivedDATA(p);
}
//EIFS implementation
if(macstate==Idle && p->machr.ReceiverNodeID!=n[i].node_id)
{
sp->schedule(18,EIFS,n[i].node_id,0);
}
}
void MAC802_11:: ProcessReceivedDATA(Packet* p)
{ p->cmn.ReceivedByReceiver=1;
if(p->cmn.dummy==0)
{
AGTReceived[p->machr.flow_id]++;
if (n[i].router.BufferOccupancy[p->machr.flow_id]<n[i].router.BufferSize)
{ n[i].router.push(p->machr.flow_id);
TotalRecvPkts[p->machr.flow_id]++;
}
//else drop(p,BufferOverflow)
else TotalDroppedPkts[p->machr.flow_id]++;
}
}
void MAC802_11::recvACK(Packet* p)
{ if(macstate==WaitingForACK)
{ // printf("\nFlowid=%d",p->machr.flow_id);
if(p->machr.ReceiverNodeID==n[i].node_id)
{
TotalXmitPkts[p->machr.flow_id]++;
LongRetry=0;
macstate=Idle;
cw=resetCW();
DummyPkt2Send[p->machr.XmitterNodeID][p->machr.flow_id]=0;
idle();
}
else if(p->machr.ReceiverNodeID2==n[i].node_id)
{
TotalXmitPkts[p->machr.flow_id2]++;
LongRetry=0;
macstate=Idle;
cw=resetCW();
DummyPkt2Send[p->machr.XmitterNodeID][p->machr.flow_id2]=0;
idle();
}
}
}
void MAC802_11::CheckBackOff()
{
if( macstate==BackingOff)
cw=max(0,BackOffEndTime-sp->get_clock());
}