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wireless-phyExt.cc
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wireless-phyExt.cc
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/*
* Copyright (C) 2007
* Mercedes-Benz Research & Development North America, Inc. and
* University of Karlsruhe (TH)
* All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*
* The copyright of this module includes the following
* linking-with-specific-other-licenses addition:
*
* In addition, as a special exception, the copyright holders of
* this module give you permission to combine (via static or
* dynamic linking) this module with free software programs or
* libraries that are released under the GNU LGPL and with code
* included in the standard release of ns-2 under the Apache 2.0
* license or under otherwise-compatible licenses with advertising
* requirements (or modified versions of such code, with unchanged
* license). You may copy and distribute such a system following the
* terms of the GNU GPL for this module and the licenses of the
* other code concerned, provided that you include the source code of
* that other code when and as the GNU GPL requires distribution of
* source code.
*
* Note that people who make modified versions of this module
* are not obligated to grant this special exception for their
* modified versions; it is their choice whether to do so. The GNU
* General Public License gives permission to release a modified
* version without this exception; this exception also makes it
* possible to release a modified version which carries forward this
* exception.
*
*/
/*
* This code was designed and developed by:
*
* Qi Chen : qi.chen@daimler.com
* Felix Schmidt-Eisenlohr : felix.schmidt-eisenlohr@kit.edu
* Daniel Jiang : daniel.jiang@daimler.com
*
* For further information see:
* http://dsn.tm.uni-karlsruhe.de/english/Overhaul_NS-2.php
*/
#include <math.h>
#include <functional>
#include <wireless-phyExt.h>
#include <ip.h>
#include <agent.h>
#include <trace.h>
#include "mac-802_11Ext.h"
#include <map>
#include <iostream>
#include <ranvar.h>
#include <float.h>
/* ======================================================================
WirelessPhyExt Interface
====================================================================== */
static class WirelessPhyExtClass : public TclClass {
public:
WirelessPhyExtClass() :
TclClass("Phy/WirelessPhyExt") {
}
TclObject* create(int, const char*const*) {
return (new WirelessPhyExt);
}
} class_WirelessPhyExt;
WirelessPhyExt::WirelessPhyExt() :
WirelessPhy(), tX_Timer(this), rX_Timer(this), preRX_Timer(this) {
bind("CPThresh_", &CPThresh_); //not used at the moment, BPSK_SNR_ is used in preamble capture
bind("RXThresh_", &RXThresh_); //not used at the moment
bind("CSThresh_", &CSThresh_);
bind("Pt_", &Pt_);
bind("freq_", &freq_);
bind("L_", &L_);
bind("PreambleCaptureSwitch_", &PreambleCaptureSwitch_);
bind("DataCaptureSwitch_", &DataCaptureSwitch_);
bind("SINR_PreambleCapture_", &SINR_PreambleCapture_);
bind("SINR_DataCapture_", &SINR_DataCapture_);
bind("HeaderDuration_", &HeaderDuration_);
bind("PHY_DBG_", &PHY_DBG);
bind("BasicModulationScheme_", &BasicModulationScheme_);
bind("trace_dist_", &trace_dist_);
bind("noise_floor_", &noise_floor_);
bind("PowerMonitorThresh_", &PowerMonitorThresh_);
lambda_ = SPEED_OF_LIGHT / freq_;
node_ = 0;
ant_ = 0;
propagation_ = 0;
powerMonitor = new PowerMonitor(this);
//channel state
state = SEARCHING;
pkt_RX = 0;
power_RX = 0;
}
int WirelessPhyExt::command(int argc, const char*const* argv) {
TclObject *obj;
if (argc == 3) {
if (strcasecmp(argv[1], "setMacAddr")==0) {
return TCL_OK;
} else if ( (obj = TclObject::lookup(argv[2])) == 0) {
fprintf(stderr,"WirelessPhyExt: %s lookup of %s failed\n",
argv[1], argv[2]);
return TCL_ERROR;
} else if (strcmp(argv[1], "propagation") == 0) {
assert(propagation_ == 0);
propagation_ = (Propagation*) obj;
return TCL_OK;
} else if (strcasecmp(argv[1], "antenna") == 0) {
ant_ = (Antenna*) obj;
return TCL_OK;
} else if (strcasecmp(argv[1], "node") == 0) {
assert(node_ == 0);
node_ = (Node *)obj;
return TCL_OK;
}
}
return WirelessPhy::command(argc, argv);
}
void WirelessPhyExt::sendDown(Packet *p) {
/*
* Sanity Check
*/
assert(initialized());
if (PHY_DBG)
log("SendDown", "");
switch (state) {
case TXing:
cout << "wrong in MAC logic case 1"<<endl;
exit(1);
break;
case RXing:
rX_Timer.cancel();
// case 7
discard(pkt_RX, power_RX, "INT");
pkt_RX=0;
power_RX=0;
break;
case PreRXing:
preRX_Timer.cancel();
// case 6
discard(pkt_RX, power_RX, "INT");
pkt_RX=0;
power_RX=0;
break;
case SEARCHING:
break;
default:
cout << "Only four states valid"<<endl;
exit(1);
}
/*
* Stamp the packet with the interface arguments
*/
p->txinfo_.stamp((MobileNode*)node(), ant_->copy(), Pt_, lambda_);
// Send the packet & set sender timer
struct hdr_cmn * cmh = HDR_CMN(p);
setState(TXing);
tX_Timer.sched(cmh->txtime());
powerMonitor->recordPowerLevel(Pt_, cmh->txtime());
downtarget_->recv(p, this);
}
int WirelessPhyExt::sendUp(Packet *p) {
/*
* Sanity Check
*/
assert(initialized());
assert(p);
// struct hdr_mac802_11* dh = HDR_MAC802_11(p);
struct hdr_cmn * cmh = HDR_CMN(p);
PacketStamp s;
double Pr;
if (propagation_) {
s.stamp((MobileNode*)node(), ant_, 0, lambda_);
// pass the packet to RF model for the calculation of Pr
Pr = propagation_->Pr(&p->txinfo_, &s, this);
powerMonitor->recordPowerLevel(Pr, cmh->txtime());
if (PHY_DBG) {
char msg[1000];
sprintf(msg, "Id: %d Pr: %f PL: %f SINR: %f TXTIME: %f", cmh->uid(), Pr
*1e9, powerMonitor->getPowerLevel()*1e9, Pr
/(powerMonitor->getPowerLevel()-Pr), cmh->txtime());
log("Sendup", msg);
}
switch (state) {
case TXing:
//case 12
discard(p, Pr, "TXB");
setState(TXing);
break;
case SEARCHING:
if ((powerMonitor->SINR(Pr)
>= modulation_table[BasicModulationScheme_].SINR_ratio)) {
power_RX = Pr;
pkt_RX=p->copy();
setState(PreRXing);
preRX_Timer.sched(HeaderDuration_); // preamble and PCLP header
break;
} else {
//case 1
discard(p, Pr, "SXB");
setState(SEARCHING);
break;
}
case PreRXing:
if (powerMonitor->SINR(power_RX)
>= modulation_table[BasicModulationScheme_].SINR_ratio) {
//case 4
discard(p, Pr, "PXB");
if (PHY_DBG)
log("PCAP 1st SUCC", "");
setState(PreRXing);
break;
} else {
// the preamble of pkt_RX is corrupted
// case 2
discard(pkt_RX, power_RX, "PXB");
Packet::free(pkt_RX);
power_RX=0;
preRX_Timer.cancel();
pkt_RX=0;
if (PHY_DBG)
log("PCAP 1st FAIL", "");
if (PreambleCaptureSwitch_) {
if (powerMonitor->SINR(Pr) >= SINR_PreambleCapture_) {
pkt_RX=p->copy();
power_RX =Pr;
if (PHY_DBG)
log("PCAP 2nd SUCC", "");
setState(PreRXing);
preRX_Timer.sched(HeaderDuration_);
break;
} else {
//case 3
discard(p, Pr, "PXB");
if (PHY_DBG)
log("PCAP 2nd FAIL", "");
setState(SEARCHING);
break;
}
} else {
discard(p, Pr, "PXB");
if (PHY_DBG)
log("PCAP 2nd FAIL N/A", "");
setState(SEARCHING);
break;
}
}
case RXing:
if (powerMonitor->SINR(power_RX) >= SINR_Th_RX) {
//case 8
discard(p, Pr, "RXB");
if (PHY_DBG)
log("DCAP 1st SUCC", "");
setState(RXing);
break;
} else {
if (PHY_DBG)
log("DCAP 1st FAIL", "");
HDR_CMN(pkt_RX)->error()=1;
if (DataCaptureSwitch_) {
if (powerMonitor->SINR(Pr) >= SINR_DataCapture_) {
// case 9
rX_Timer.cancel();
discard(pkt_RX, power_RX, "RXB");
pkt_RX=0;
//------ start the prerx of this new packet p---//
pkt_RX=p->copy();
power_RX =Pr;
if (PHY_DBG)
log("DCAP 2nd SUCC", "");
setState(PreRXing);
preRX_Timer.sched(HeaderDuration_);
} else {
// case 10
discard(p, Pr, "RXB");
if (PHY_DBG)
log("DCAP 2nd FAIL", "");
setState(RXing);
}
} else {
// case 11
discard(p, Pr, "RXB");
if (PHY_DBG)
log("DCAP 2nd FAIL N/A", "");
setState(RXing);
}
break;
}
default:
cout<<"packet arrive from chanel at invalid PHY state"<<endl;
exit(-1);
}
}
return 0; // the incoming MAC frame will be freed by phy.cc.
}
double WirelessPhyExt::SINR_Th(int modulationScheme) {
if (PHY_DBG) {
char msg[1000];
sprintf(msg, ": = %s threshold %f ",
modulation_table[modulationScheme].schemeName,
modulation_table[modulationScheme].SINR_ratio);
log("Mod_Scheme", msg);
}
return modulation_table[modulationScheme].SINR_ratio;
}
void WirelessPhyExt::handle_TXtimeout() {
assert(state==TXing);
Mac802_11Ext * mac_ = (Mac802_11Ext*)(uptarget_);
mac_->handleTXEndIndication();
setState(SEARCHING);
}
void WirelessPhyExt::handle_RXtimeout() {
assert(state==RXing);
setState(SEARCHING);
struct hdr_cmn * cmh = HDR_CMN(pkt_RX);
Mac802_11Ext * mac_ = (Mac802_11Ext*)(uptarget_);
if (cmh->error()) {
//case 5, 9
discard(pkt_RX, power_RX, "RXB");
pkt_RX=0;
power_RX=0;
mac_->handleRXEndIndication(0);
} else {
mac_->handleRXEndIndication(pkt_RX);
pkt_RX=0;
power_RX=0;
}
}
void WirelessPhyExt::handle_PreRXtimeout() {
assert(state==PreRXing);
assert(pkt_RX);
struct hdr_cmn * cmh = HDR_CMN(pkt_RX);
SINR_Th_RX = SINR_Th(cmh->mod_scheme_);
// cout<<"sinr"<<SINR_Th_RX<<endl;
if (powerMonitor->SINR(power_RX) < SINR_Th_RX) {
if (PHY_DBG)
log("PreRxTimeout", "BodyError");
cmh->error() = 1;
}
setState(RXing);
rX_Timer.sched(cmh->txtime()-HeaderDuration_); //receiving rest of the MAC frame
Mac802_11Ext * myUpMAC = (Mac802_11Ext*)(uptarget_);
myUpMAC->handleRXStartIndication();
}
void WirelessPhyExt::sendCSBusyIndication() {
Mac802_11Ext * myUpMAC = (Mac802_11Ext*)(uptarget_);
myUpMAC->handlePHYBusyIndication();
}
void WirelessPhyExt::sendCSIdleIndication() {
Mac802_11Ext * myUpMAC = (Mac802_11Ext*)(uptarget_);
myUpMAC->handlePHYIdleIndication();
}
int WirelessPhyExt::discard(Packet *p, double power, char* reason) {
struct hdr_cmn *ch = HDR_CMN(p);
double modulation_SINR =SINR_Th(ch->mod_scheme_);
double Xt, Yt, Zt; // location of transmitter
double Xr, Yr, Zr; // location of receiver
PacketStamp s;
s.stamp((MobileNode*)node(), ant_, 0, lambda_);
s.getNode()->getLoc(&Xt, &Yt, &Zt);
p->txinfo_.getNode()->getLoc(&Xr, &Yr, &Zr);
Xr += p->txinfo_.getAntenna()->getX();
Yr += p->txinfo_.getAntenna()->getY();
Zr += p->txinfo_.getAntenna()->getZ();
Xt += s.getAntenna()->getX();
Yt += s.getAntenna()->getY();
Zt += s.getAntenna()->getZ();
double dX = Xr - Xt;
double dY = Yr - Yt;
double dZ = Zr - Zt;
double d = sqrt(dX * dX + dY * dY + dZ * dZ);
if (d < trace_dist_) {
if (power < modulation_SINR * noise_floor_)
reason = "DND";
if (power < modulation_table[BasicModulationScheme_].SINR_ratio * noise_floor_ )
reason = "PND";
drop(p, reason);
} else {
Packet::free(p);
}
return 0;
}
void WirelessPhyExt::dump(void) const {
}
void WirelessPhyExt::log(char * event, char* additional) {
if (PHY_DBG)
cout<<"L "<<Scheduler::instance().clock()<<" "<<node_->nodeid()<<" "<<"PHY"<<" "<<event<<" "
<<additional<<endl;
}
void WirelessPhyExt::setState(int newstate) {
if (PHY_DBG) {
char msg[1000];
sprintf(msg, "%d -> %d", state, newstate);
log("PHYState", msg);
}
if ( state == SEARCHING && newstate != SEARCHING ) {
// indicate MAC busy since we are either receiving or sending
// only if we have not been busy already
if (powerMonitor->getPowerLevel() < CSThresh_) {
sendCSBusyIndication();
}
} else if ( state != SEARCHING && newstate == SEARCHING) {
// if we are idle AND powerLevel is below CSthresh, indicate MAC idle
if (powerMonitor->getPowerLevel() < CSThresh_) {
sendCSIdleIndication();
}
}
state = newstate;
}
int WirelessPhyExt::getState() {
return state;
}
void TX_Timer::expire(Event *) {
wirelessPhyExt->handle_TXtimeout();
return;
}
void RX_Timer::expire(Event *) {
wirelessPhyExt->handle_RXtimeout();
return;
}
void PreRX_Timer::expire(Event *) {
wirelessPhyExt->handle_PreRXtimeout();
return;
}
//**************************************************************
PowerMonitor::PowerMonitor(WirelessPhyExt * phy) {
// initialize, the NOISE is the environmental noise
wirelessPhyExt = phy;
CS_Thresh = wirelessPhyExt->CSThresh_; // monitor_Thresh = CS_Thresh;
monitor_Thresh = wirelessPhyExt->PowerMonitorThresh_;
powerLevel = wirelessPhyExt->noise_floor_; // noise floor is -99dbm
}
void PowerMonitor::recordPowerLevel(double signalPower, double duration) {
// to reduce the number of entries recorded in the interfList
if (signalPower < monitor_Thresh )
return;
interf timerEntry;
timerEntry.Pt = signalPower;
timerEntry.end = Scheduler::instance().clock() + duration;
list<interf>:: iterator i;
for (i=interfList_.begin(); i != interfList_.end() && i->end <= timerEntry.end; i++) { }
interfList_.insert(i, timerEntry);
resched((interfList_.begin())->end - Scheduler::instance().clock());
powerLevel += signalPower; // update the powerLevel
if (wirelessPhyExt->getState() == SEARCHING && powerLevel >= CS_Thresh) {
wirelessPhyExt->sendCSBusyIndication();
}
}
double PowerMonitor::getPowerLevel() {
if (powerLevel > wirelessPhyExt->noise_floor_)
return powerLevel;
else
return wirelessPhyExt->noise_floor_;
}
void PowerMonitor::setPowerLevel(double power) {
powerLevel = power;
}
double PowerMonitor::SINR(double Pr) {
if (getPowerLevel()-Pr<=0) {
// cout<<"PowerLevel lower than Pr"<<endl;exit(-1);
// char msg[1000];
// sprintf(msg,"PowerLevel %f lower than Pr %f = %f",getPowerLevel()*1e9,Pr*1e9,(getPowerLevel()-Pr));
// wirelessPhyExt->log("PMX",msg);
// exit(-1);
return 0.0; //internal event contention, new msg arrives betweeen the expire of two timers.
}
return Pr/(getPowerLevel()-Pr);
}
double WirelessPhyExt::getDist(double Pr, double Pt, double Gt, double Gr,
double hr, double ht, double L, double lambda)
{
if (propagation_) {
return propagation_->getDist(Pr, Pt, Gt, Gr, hr, ht, L,
lambda);
}
return 0;
}
void PowerMonitor::expire(Event *) {
double pre_power = powerLevel;
double time = Scheduler::instance().clock();
list<interf>:: iterator i;
i=interfList_.begin();
while(i != interfList_.end() && i->end <= time) {
powerLevel -= i->Pt;
interfList_.erase(i++);
}
if (!interfList_.empty())
resched((interfList_.begin())->end - Scheduler::instance().clock());
char msg[1000];
sprintf(msg, "Power: %f -> %f", pre_power*1e9, powerLevel*1e9);
wirelessPhyExt->log("PMX", msg);
// check if the channel becomes idle ( busy -> idle )
if (wirelessPhyExt->getState() == SEARCHING && powerLevel < CS_Thresh) {
wirelessPhyExt->sendCSIdleIndication();
}
}