/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*-  * * Copyright (c) 1996 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the Computer Systems *	Engineering Group at Lawrence Berkeley Laboratory and the Daedalus *	research group at UC Berkeley. * 4. Neither the name of the University nor of the Laboratory may be used *    to endorse or promote products derived from this software without *    specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $Header: /nfs/jade/vint/CVSROOT/ns-2/mac/wireless-phy.cc,v 1.19 2002/12/11 01:22:52 difa Exp $ * * Ported from CMU/Monarch's code, nov'98 -Padma Haldar. * wireless-phy.cc */#include <math.h>#include <packet.h>#include <mobilenode.h>#include <phy.h>#include <propagation.h>#include <modulation.h>#include <omni-antenna.h>#include <wireless-phy.h>#include <packet.h>#include <ip.h>#include <agent.h>#include <trace.h>#include "diffusion/diff_header.h"#define max(a,b) (((a)<(b))?(b):(a))void Idle_Timer::expire(Event *) {	a_->UpdateIdleEnergy();}/* ======================================================================   WirelessPhy Interface   ====================================================================== */static class WirelessPhyClass: public TclClass {public:        WirelessPhyClass() : TclClass("Phy/WirelessPhy") {}        TclObject* create(int, const char*const*) {                return (new WirelessPhy);        }} class_WirelessPhy;WirelessPhy::WirelessPhy() : Phy(), idle_timer_(this), status_(IDLE){	/*	 *  It sounds like 10db should be the capture threshold.	 *	 *  If a node is presently receiving a packet a a power level	 *  Pa, and a packet at power level Pb arrives, the following	 *  comparion must be made to determine whether or not capture	 *  occurs:	 *	 *    10 * log(Pa) - 10 * log(Pb) > 10db	 *	 *  OR equivalently	 *	 *    Pa/Pb > 10.	 *	 */	bind("CPThresh_", &CPThresh_);	bind("CSThresh_", &CSThresh_);	bind("RXThresh_", &RXThresh_);	//bind("bandwidth_", &bandwidth_);	bind("Pt_", &Pt_);	bind("freq_", &freq_);	bind("L_", &L_);		lambda_ = SPEED_OF_LIGHT / freq_;	node_ = 0;	ant_ = 0;	propagation_ = 0;	modulation_ = 0;	// Assume AT&T's Wavelan PCMCIA card -- Chalermek        //	Pt_ = 8.5872e-4; // For 40m transmission range.	//      Pt_ = 7.214e-3;  // For 100m transmission range.	//      Pt_ = 0.2818; // For 250m transmission range.	//	Pt_ = pow(10, 2.45) * 1e-3;         // 24.5 dbm, ~ 281.8mw		Pt_consume_ = 0.660;  // 1.6 W drained power for transmission	Pr_consume_ = 0.395;  // 1.2 W drained power for reception	//	P_idle_ = 0.035; // 1.15 W drained power for idle	P_idle_ = 0.0;	channel_idle_time_ = NOW;	update_energy_time_ = NOW;	last_send_time_ = NOW;		idle_timer_.resched(1.0);}intWirelessPhy::command(int argc, const char*const* argv){	TclObject *obj; 	if (argc==2) {		if (strcasecmp(argv[1], "NodeOn") == 0) {			if (em() == NULL) 				return TCL_OK;			if (NOW > update_energy_time_) {				update_energy_time_ = NOW;			}			return TCL_OK;		} else if (strcasecmp(argv[1], "NodeOff") == 0) {			if (em() == NULL) 				return TCL_OK;			if (NOW > update_energy_time_) {				em()->DecrIdleEnergy(NOW-update_energy_time_,						     P_idle_);				update_energy_time_ = NOW;			}			return TCL_OK;		}	} else if(argc == 3) {		if (strcasecmp(argv[1], "setTxPower") == 0) {			Pt_consume_ = atof(argv[2]);			return TCL_OK;		} else if (strcasecmp(argv[1], "setRxPower") == 0) {			Pr_consume_ = atof(argv[2]);			return TCL_OK;		} else if (strcasecmp(argv[1], "setIdlePower") == 0) {			P_idle_ = atof(argv[2]);			return TCL_OK;		} else if( (obj = TclObject::lookup(argv[2])) == 0) {			fprintf(stderr,"WirelessPhy: %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 Phy::command(argc,argv);} void WirelessPhy::sendDown(Packet *p){	/*	 * Sanity Check	 */	assert(initialized());		if (em()) 		if ((em()->node_on() != true) || (em()->sleep())) {			Packet::free(p);			return;		}	/*	 * Decrease node's energy	 */	if(em()) {		if (em()->energy() > 0) {			//double txtime = (8.*hdr_cmn::access(p)->size())/bandwidth_;		    double txtime = hdr_cmn::access(p)->txtime();		    double start_time = max(channel_idle_time_, NOW);		    double end_time = max(channel_idle_time_, NOW+txtime);		    double actual_txtime = end_time-start_time;		    if (start_time > update_energy_time_) {			    em()->DecrIdleEnergy(start_time - 						 update_energy_time_, P_idle_);			    update_energy_time_ = start_time;		    }		    /* It turns out that MAC sends packet even though, it's		       receiving some packets.		    		    if (txtime-actual_txtime > 0.000001) {			    fprintf(stderr,"Something may be wrong at MAC\n");			    fprintf(stderr,"act_tx = %lf, tx = %lf\n", actual_txtime, txtime);		    }		    */		   // Sanity check		   double temp = max(NOW,last_send_time_);		   /*		   if (NOW < last_send_time_) {			   fprintf(stderr,"Argggg !! Overlapping transmission. NOW %lf last %lf temp %lf\n", NOW, last_send_time_, temp);		   }		   */		   		   double begin_adjust_time = min(channel_idle_time_, temp);		   double finish_adjust_time = min(channel_idle_time_, NOW+txtime);		   double gap_adjust_time = finish_adjust_time - begin_adjust_time;		   if (gap_adjust_time < 0.0) {			   fprintf(stderr,"What the heck ! negative gap time.\n");		   }		   if ((gap_adjust_time > 0.0) && (status_ == RECV)) {			   em()->DecrTxEnergy(gap_adjust_time,					      Pt_consume_-Pr_consume_);		   }		   em()->DecrTxEnergy(actual_txtime,Pt_consume_);		   if (end_time > channel_idle_time_) {			   status_ = SEND;		   }									   last_send_time_ = NOW+txtime;		   channel_idle_time_ = end_time;		   update_energy_time_ = end_time;		   if (em()->energy() <= 0) {			   em()->setenergy(0);			   ((MobileNode*)node())->log_energy(0);		   }		} else {			Packet::free(p);			return;		}	}	/*	 *  Stamp the packet with the interface arguments	 */	p->txinfo_.stamp((MobileNode*)node(), ant_->copy(), Pt_, lambda_);	// Send the packet	channel_->recv(p, this);}int WirelessPhy::sendUp(Packet *p){	/*	 * Sanity Check	 */	assert(initialized());	PacketStamp s;	double Pr;	int pkt_recvd = 0;		// if the node is in sleeping mode, drop the packet simply	if (em()) 		if (em()->sleep() || (em()->node_on() != true)) {			pkt_recvd = 0;			goto DONE;		}		// if the energy goes to ZERO, drop the packet simply	if (em()) {		if (em()->energy() <= 0) {			pkt_recvd = 0;			goto DONE;		}	}	if(propagation_) {		s.stamp((MobileNode*)node(), ant_, 0, lambda_);		Pr = propagation_->Pr(&p->txinfo_, &s, this);                //added for prediction                struct hdr_cmn *ch = HDR_CMN(p);                if (ch->prev_hop_ != node()->address() && Pr < 2.59e-8 &&                   (ch->next_hop_ == MAC_BROADCAST || ch->next_hop_ == node()->address())){                    node()->addValue(ch->prev_hop_, Scheduler::instance().clock(), 1.0e10*Pr);                }                // ****************		if (Pr < CSThresh_) {			pkt_recvd = 0;			goto DONE;		}		if (Pr < RXThresh_) {			/*			 * We can detect, but not successfully receive			 * this packet.			 */			hdr_cmn *hdr = HDR_CMN(p);			hdr->error() = 1;#if DEBUG > 3			printf("SM %f.9 _%d_ drop pkt from %d low POWER %e/%e\n",			       Scheduler::instance().clock(), node()->index(),			       p->txinfo_.getNode()->index(),			       Pr,RXThresh);#endif		}	}	if(modulation_) {		hdr_cmn *hdr = HDR_CMN(p);		hdr->error() = modulation_->BitError(Pr);	}		/*	 * The MAC layer must be notified of the packet reception	 * now - ie; when the first bit has been detected - so that	 * it can properly do Collision Avoidance / Detection.	 */	pkt_recvd = 1;DONE:	p->txinfo_.getAntenna()->release();	/* WILD HACK: The following two variables are a wild hack.	   They will go away in the next release...	   They're used by the mac-802_11 object to determine	   capture.  This will be moved into the net-if family of 	   objects in the future. */	p->txinfo_.RxPr = Pr;	p->txinfo_.CPThresh = pow(10,CPThresh_/10); /* CPThresh_ is in db */	/*	 * Decrease energy if packet successfully received	 */	if(pkt_recvd && em()) {		//double rcvtime = (8. * hdr_cmn::access(p)->size())/bandwidth_;		double rcvtime = hdr_cmn::access(p)->txtime();		// no way to reach here if the energy level < 0				/*		  node()->add_rcvtime(rcvtime);	  		  em()->DecrRcvEnergy(rcvtime,Pr_consume_);		*/		double start_time = max(channel_idle_time_, NOW);		double end_time = max(channel_idle_time_, NOW+rcvtime);		double actual_rcvtime = end_time-start_time;		if (start_time > update_energy_time_) {			em()->DecrIdleEnergy(start_time-update_energy_time_,					     P_idle_);			update_energy_time_ = start_time;		}				em()->DecrRcvEnergy(actual_rcvtime,Pr_consume_);		if (end_time > channel_idle_time_) {			status_ = RECV;		}		channel_idle_time_ = end_time;		update_energy_time_ = end_time;		/*		  hdr_diff *dfh = HDR_DIFF(p);		  printf("Node %d receives (%d, %d, %d) energy %lf.\n",		  node()->address(), dfh->sender_id.addr_, 		  dfh->sender_id.port_, dfh->pk_num, node()->energy());		*/				if (em()->energy() <= 0) {  			// saying node died			em()->setenergy(0);			((MobileNode*)node())->log_energy(0);		}	}		return pkt_recvd;}voidWirelessPhy::node_on(){        if (em() == NULL) 	    return;	   	if (NOW > update_energy_time_) {      	    update_energy_time_ = NOW;   	}}void WirelessPhy::node_off(){	if (em() == NULL)            return;        if (NOW > update_energy_time_) {            em()->DecrIdleEnergy(NOW-update_energy_time_,                                P_idle_);            update_energy_time_ = NOW;	}}voidWirelessPhy::dump(void) const{	Phy::dump();	fprintf(stdout,		"\tPt: %f, Gt: %f, Gr: %f, lambda: %f, L: %f\n",		Pt_, ant_->getTxGain(0,0,0,lambda_), ant_->getRxGain(0,0,0,lambda_), lambda_, L_);	//fprintf(stdout, "\tbandwidth: %f\n", bandwidth_);	fprintf(stdout, "--------------------------------------------------\n");}void WirelessPhy::UpdateIdleEnergy(){	if (em() == NULL) {		return;	}	if (NOW > update_energy_time_ && em()->node_on()) {		  em()-> DecrIdleEnergy(NOW-update_energy_time_,					P_idle_);		  update_energy_time_ = NOW;	}	// log node energy	if (em()->energy() > 0) {		((MobileNode *)node_)->log_energy(1);        } else {		((MobileNode *)node_)->log_energy(0);           }	idle_timer_.resched(10.0);}