ugs_traffic.cc

WiMAX source code for NS-2, v1.03

/**************************************************************************************
* *Copyright (c) 2006 Regents of the University of Chang Gung 						*
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 *    must display the following acknowledgement:									*
 *	This product includes software developed by the Computer Systems					*
 *	Engineering Group at Lawrence Berkeley Laboratory.							*
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#include <stdlib.h>
 
#include "random.h"
#include "trafgen.h"
#include "ranvar.h"


/* 
 * Constant bit rate traffic source.   Parameterized by interval, (optional)
 * random noise in the interval, and packet size.  
 */

class UGS_Traffic : public TrafficGenerator {
 public:
	UGS_Traffic();
	virtual double next_interval(int&);
	//HACK so that udp agent knows interpacket arrival time within a burst
	inline double interval() { return (interval_); }
 protected:
	virtual void start();
	void init();
	double rate_;     /* send rate during on time (bps) */
	double interval_; /* packet inter-arrival time during burst (sec) */
	double random_;
	int seqno_;
	int maxpkts_;
};

static class UGSTrafficClass : public TclClass {
 public:
	UGSTrafficClass() : TclClass("Application/Traffic/UGS") {}
	TclObject* create(int, const char*const*) {
		return (new UGS_Traffic());
	}
} class_UGS_Traffic;

UGS_Traffic::UGS_Traffic() : seqno_(0)
{
	//bind_bw("rate_", &rate_);
	//bind("random_", &random_);
	//bind("packetSize_", &size_);
	rate_=448000;
	random_=0;
	size_=210;
	maxpkts_=268435456;
}

void UGS_Traffic::init()
{
        // compute inter-packet interval 
	interval_ = (double)(size_ << 3)/(double)rate_;
	if (agent_)
		if (agent_->get_pkttype() != PT_TCP &&
 		    agent_->get_pkttype() != PT_TFRC)
			//Setting packet type to UGS.
			agent_->set_pkttype(PT_UGS);
}

void UGS_Traffic::start()
{
        init();
        running_ = 1;
        timeout();
}

double UGS_Traffic::next_interval(int& size)
{
	//printf("double UGS_Traffic::next_interval(int& size) \n");
	// Recompute interval in case rate_ or size_ has changes
	interval_ = (double)(size_ << 3)/(double)rate_;
	double t = interval_;
	if (random_)
		t += interval_ * Random::uniform(-0.5, 0.5);
	//UGS service using constant bit rate packet.	
	size = size_;
	//printf("---------- UGS traffic t : %f \t",t);
	//printf("size : %d ----------\n",size);
	if (++seqno_ < maxpkts_)
		return(t);
	else
		return(-1); 
}