Dear ns-users;
I use ns-allinone-2.29 under cygwin/winXP.
I faced the following problem after changing the MAC in ns2.29.
during the simulation I got the follwoing Error:
Scheduler: Event UID not valid!
the code is here ( I made the changes just in the recv() function):
void Mac::recv(Packet* p, Handler* h)
{
printf(" \n Now you are in Mac layer");
int i;
int k;
int r;
int errcount;
int recR;
//===================start=============================== BiLaL
if (hdr_cmn::access(p)->direction() == hdr_cmn::UP)
{
if (hdr_mac::access(p)-> ftype() == MF_FEC_R)
{
Red_= hdr_mac::access(p)->Red();
drop(p);
printf(" \n Redundancy is CHANGED");
return;
}
if (hdr_cmn::access(p)->size()%framesize_ != 0) k=1;
else k=0;
k +=(hdr_cmn::access(p)->size()+ Red_)/framesize_ ;
for (i=0;i<= k; i++)
{
r=(rand()%100);
if (r >= p_) errcount++;
}
if (errcount > Red_)
{
drop(p);//Packet::free(p); //discard the received packet
printf("\n one packet has been lost");
Packet *p = Packet::alloc();
hdr_cmn* ch = HDR_CMN(p);
hdr_mac* mhr = HDR_MAC(p);
mhr->ftype()=MF_FEC_R;
ch->uid() = 0;
ch->ptype() = PT_MAC;
ch->iface() = -2;
ch->error() = 0;
ch->size()=64;
ch->direction() = hdr_cmn::DOWN;
// *********** changing the Redundancy strategy
mhr-> Red()= errcount;
callback_=h;
mhr->set(MF_FEC_R, index_);
state(MAC_SEND);
printf("\n telling the sender by new R");
sendDown(p);
}
else {
// the Redundant Data must be removed
hdr_mac* mhr = HDR_MAC(p);
recR = mhr-> Red();
hdr_cmn::access(p)->size()-= recR;
//===================END=============================== BiLaL
sendUp(p);
}
return;
}
callback_ = h;
hdr_mac* mh = HDR_MAC(p);
mh->set(MF_DATA, index_);
state(MAC_SEND);
//=======================================================FEC (Redundancy)
BiLaL
printf("\n Here we adding the R to TCP packet");
hdr_cmn* ch = HDR_CMN(p);
ch->size() += Red_;
//========================================================
sendDown(p);
the problem stop inside the sendDown() function and the problem as I told
you first:
Scheduler: Event UID not valid!
I look forward to your help as soon as possible.
thank you in advance
Kind Regards
