ll-ue.cc

对ns2软件进行UMTS扩展

		if (apps_[i].flowid_ == ih->flowid()){
			// flowid already registered
			if (apps_[i].wait_ == 1){
				// resources already allocated
				appstimer_->start(ih->flowid(), 1.0);   // start time
				send_msg(p->copy());		// send packet to IFQ
				return (1);
			} else if (apps_[i].wait_ == 0) {
				// flow waiting for resource reply
				appstimer_->start(ih->flowid(), 1.0);	// start time
				q_[i]->enque(p);		// store the packet in the queue until response
				return (1);
			} else {
				// is the first packet of that flow
				// calculate the physical rate that is going to send over the air interface
				apps_[i].rate_ = get_rate(apps_[i].user_rate_, apps_[i].c_coding_, ch->size());
				// calculate the interval between two packets
				apps_[i].interval_ = (ch->size() * 8)/ apps_[i].user_rate_;
				// add a timer for this flow in the list of timers
				appstimer_->AddANode(ih->flowid());
				appstimer_->start(ih->flowid(), 1.0);  // start timer
				// update field of the array apps_[]
				apps_[i].dest_ = ih->daddr();
				// spreading factor needed in physical layer
				apps_[i].sf_ = get_sf(apps_[i].rate_);
				send_res_req(p->copy(), i);  // send the resource request message
				apps_[i].wait_ = 0;   // put wait = 0 to prevent sending messages
				if (verbose_) printf("UE %d at %f RRC: STORING flow %d with physical rate %e and SF %d\n"
					,ip_ue_, NOW, ih->flowid(),apps_[i].rate_,apps_[i].sf_);
				q_[i]->enque(p->copy());  // store the packet in the queue until response
				return (1);
			}
		}
	}
	return (0);
}

// for release procedure: send a release reply message
void LLUE::send_release_reply(Packet* p)
{
	Scheduler& s = Scheduler::instance();
	Packet *sp = p->copy();
	hdr_ll *lh = HDR_LL(sp);
	hdr_ip *ih = HDR_IP(sp);
	hdr_phy *ph = HDR_PHY_UMTS(sp);
	hdr_cmn *ch = HDR_CMN(sp);

	// fill ip, common and physical headers
	ih->daddr() = ih->saddr();
	ih->saddr() = ip_ue_;
	lh->lltype() = LL_RELEASE_REPLY;
	ph->sa() = ue_address_;
	ph->da() = nodeb_address_;
	ch->direction() = hdr_cmn::DOWN;
	ch->channel_t() = CCCH;  // ch allocation
	if (verbose_) printf("UE %d at %f RRC: LL_RELEASE_REPLY sent related to the flowid %d\n",
		ip_ue_, NOW, ih->flowid());
	s.schedule(downtarget_, sp, delay_);  // send the packet down
	Packet::free(p);

	return;
}

// send data packets received from the application to the IFQ
void LLUE::send_msg(Packet* p)
{
	int i;
	Scheduler& s = Scheduler::instance();

	hdr_cmn *chp = HDR_CMN(p);
	hdr_ll *lhp = HDR_LL(p);
	hdr_ip *ihp = HDR_IP(p);
	hdr_phy *php = HDR_PHY_UMTS(p);

	// fill ll, physical and common headers
	lhp->lltype() = LL_DATA;
	for (i=0; i<MAX_NUM_FLOWS; i++) {
		if (ihp->flowid() == apps_[i].flowid_) {
			lhp->tx_rate() = apps_[i].rate_;  // puts the fisical rate in the packet
			break;
		}
	}

	php->c_coding() = apps_[i].c_coding_;  // channel coding
	chp->channel_t() = DTCH;  // ch allocation
	chp->next_hop_ = ip_nodeb_;
	chp->direction() = hdr_cmn::DOWN;
	chp->error() = 0;

	if (verbose_) printf("UE %d at %f RRC: sending DATA DOWN with uid: %d to destination(ip) %d and flow %d\n",  ip_ue_, NOW, chp->uid(), Address::instance().get_nodeaddr(ihp->daddr()), ihp->flowid());
	s.schedule(downtarget_, p, delay_);  // send the packet down through the scheduler

	return;
}

// for paging procedure: send the paging response
void LLUE::send_paging_ok(Packet* p)
{
	Scheduler& s = Scheduler::instance();

	hdr_ip *ih = HDR_IP(p);
	hdr_rlc_umts *rh = HDR_RLC_UMTS(p);
	Packet* sp = Packet::alloc();
	hdr_ip *ihsp = HDR_IP(sp);
	hdr_cmn *chsp = HDR_CMN(sp);
	hdr_ll *lhsp = HDR_LL(sp);
	hdr_phy *phsp = HDR_PHY_UMTS(sp);
	struct hdr_rlc_umts *rhsp = HDR_RLC_UMTS(sp);

	// fill physical, ll, rlc, common and ip headers
	phsp->sa() = ue_address_;
	phsp->da() = nodeb_address_;
	phsp->c_coding() = CONV_HALF;

	lhsp->lltype() = LL_PAGING;
	lhsp->paging_ok_ = 1;	// reponse ok

	rhsp->ack() = rh->ack();
	rhsp->frag() = rh->frag();

	chsp->channel_t() = CCCH;  // ch allocation
	chsp->next_hop_ = ip_nodeb_;
	chsp->direction() = hdr_cmn::DOWN;
	chsp->error() = 0;
	chsp->size() = 5;

	ihsp->flowid() = ih->flowid();
	ihsp->saddr() = ih->saddr();
	ihsp->daddr() = ih->daddr();

	if (verbose_) printf("UE %d at %f RRC: sending PAGING_OK\n", ip_ue_, NOW);
	s.schedule(downtarget_, sp, delay_);  // send the packet down through the scheduler

	Packet::free(p);
	p = NULL;
	return;
}

// calculate bytes per slot in physical layer and update them
void LLUE::update_phy_bytes_slot(void)
{
	int i;
	double bytes_slot, sum = 0.0;

	// add the physical rates of all the applications currently running
	for (i=0; i<MAX_NUM_FLOWS; i++) {
		if (apps_[i].flowid_ != -1) {
			sum += apps_[i].rate_;
		}
	}

	if (sum > 0) {
		// gets the spreading factor needed for supporting the total rate
		bytes_slot = (2560 / get_sf(sum)) / 8;	// calculate bytes in physical layer
		if (sum > 960000)		// if more than one dpdch is requiered
			bytes_slot = bytes_slot * ((int)(sum / 960000) + 1);
	} else {
		// no applications running in that moment
		bytes_slot = 0.0;
	}
 	if (verbose_) printf("UE %d at %f RRC: ~~~~~~~~~~~~~~~~~~~~~ bytes_slot in PHY %f ~~~~~~~~~~~~~~\n", ip_ue_, NOW, bytes_slot);
	phy_->bytes_slot = bytes_slot;  // update bytes per slot in physical layer
	return;
}

// register a new application in RRC layer
int LLUE::insert_flow(int flow, double rate, Chan_Coding code)
{
	int i;
	for (i=0; i<MAX_NUM_FLOWS; i++) {
		// looks for a free position
		if (apps_[i].flowid_ < 0){
			// update apps_[] fieds with the new information
			apps_[i].flowid_ = flow;
			apps_[i].wait_ = -1;
			apps_[i].user_rate_ = rate;
			apps_[i].c_coding_ = code;
			if (verbose_) printf("UE %d at %f RRC: trying to insert flow %d rate %f sf %d\n",
				 ip_ue_, NOW, apps_[i].flowid_, apps_[i].rate_, apps_[i].sf_);
			return(i);
		}
	}
	// there is not free position, ERROR
	return (-1);
}

// bytes in ifq per tti
double LLUE::get_bytes(int pos)
{
	double bits, sum;
	int rlcfsize = rlc_->rlcfragsize();		// rlc fragment size
	int rlchdrsize = RLC_HDR_SZ;			// rlc-umts header size
	int machdrsize = MAC_HDR_SZ;			// mac-umts header size
	int phyhdrsize = PHY_HDR_SZ;			// phy-umts header size

	bits = (2560 / apps_[pos].sf_) * (ifq_->tti() / UMTS_SlotTime);  // bits per tti
	sum = apps_[pos].rate_;
	if (sum > 0) {
		if (sum > 960000) // more than one dpdch is required
			bits = bits * ((int)(sum / 960000) + 1);
	}
	bits = (bits * (rlcfsize + rlchdrsize + machdrsize)) / (rlcfsize + rlchdrsize + machdrsize + phyhdrsize);

	// apply decoding
	switch (apps_[pos].c_coding_) {
		case TURBO:  // turbo coding
			bits = bits/3;
			break;
		case CONV_HALF:  // convolutional half
			bits = bits/2;
			break;
		case CONV_THIRD:   // convolutional third
			bits = bits/3;
			break;
		default:
			break;
	}
	// bytes in IFQ for an application per TTI
	bits = (bits * rlcfsize) / (rlcfsize + rlchdrsize + machdrsize);
 	if (verbose_) printf("UE %d at %f RRC: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ bytes_tti in IFQ %f ~~~~~~~~~~~~~~\n", ip_ue_, NOW, bits/8);
	return(bits/8);  // bits in IFQ for that application per TTI
}

// calculate the physical rate
double LLUE::get_rate(double rate, Chan_Coding code, int psize)
{
	double rt, time;
	int rlcfsize = rlc_->rlcfragsize();		// rlc fragment size
	int rlchdrsize = RLC_HDR_SZ;			// rlc-umts header size
	int machdrsize = MAC_HDR_SZ;			// mac-umts header size
	int phyhdrsize = PHY_HDR_SZ;			// phy-umts header size


	time = (psize * 8)/ rate;		// time between two user packets
	int npkts = (int)(psize / rlcfsize);	// number of rlc fragments per user packet
	if ((psize % rlcfsize) > 0)
		npkts++;
	rt = (npkts * rlcfsize * 8)/time;	// effective user rate
	rt = (rt * (rlcfsize + rlchdrsize + machdrsize))/rlcfsize;	// user rate before channel coding
	// apply channel coding
	switch (code) {
		case 0:	// turbo coding
   			rt = 3*rt;
			break;
		case 1:	// convolutional half
   			rt = 2*rt;
			break;
		case 2:	// convolutional third
   			rt = 3*rt;
			break;
		default:
			break;
	}
	return(rt);
}

// send a resource request message
void LLUE::send_res_req(Packet* p, int i)
{
	Scheduler& s = Scheduler::instance();
	hdr_ip *ih = HDR_IP(p);
	hdr_cmn *ch = HDR_CMN(p);

	Packet* sp = Packet::alloc();
	struct hdr_cmn *chsp = HDR_CMN(sp);
	struct hdr_ll *lhsp = HDR_LL(sp);
	struct hdr_ip *ihsp = HDR_IP(sp);
	struct hdr_phy *phsp = HDR_PHY_UMTS(sp);

	// fill ll, common and ip headers
	lhsp->lltype() = LL_RES_REQ;
	lhsp->tx_rate() = apps_[i].rate_;
	lhsp->psize() = ch->size();
	lhsp->paging_ok_ = 0;

	phsp->c_coding() = CONV_HALF;
	chsp->channel_t() = CCCH;  // ch allocation
	chsp->next_hop_ = ip_nodeb_;
	chsp->direction() = hdr_cmn::DOWN;
	chsp->size() = 5;
	chsp->error() = 0;

	ihsp->flowid() = ih->flowid();
	ihsp->saddr() = ih->saddr();
	ihsp->daddr() = ih->daddr();

	if (verbose_) printf("UE %d at %f RRC: sending RESOURCE_REQUEST from ue(ip): %d to ue(ip): %d\n",  ip_ue_, NOW, Address::instance().get_nodeaddr(ihsp->saddr()),Address::instance().get_nodeaddr(ihsp->daddr()));
	s.schedule(downtarget_, sp->copy(), delay_);  // send the packet down through the scheduler

	Packet::free(sp);
	sp = NULL;
	return;
}

// for setup and handover procedures: send a setup request message
void LLUE::send_setup(void)
{
	Packet* sp = Packet::alloc();
	struct hdr_cmn *chsp = HDR_CMN(sp);
	struct hdr_ll *lhsp = HDR_LL(sp);
	struct hdr_ip *ihsp = HDR_IP(sp);
	struct hdr_phy *phsp = HDR_PHY_UMTS(sp);

	MobileNode * node_ = (MobileNode*)(phy_->netif_->node());
	Scheduler& s = Scheduler::instance();

	// fill physical, ll, common and ip headers
	chsp->direction_ = hdr_cmn::DOWN;

	lhsp->tx_rate() = 0;

	chsp->size_=32;
	chsp->error()= 0;
	chsp->channel_t()=CCCH;  // ch allocation
	chsp->next_hop_= -1;

	phsp->c_coding() = CONV_HALF;

	int k, i = 0;
	for (k=0; k<MAX_NUM_FLOWS; k++){
		phsp->flows_[k][0] = new int;
		phsp->flows_[k][1] = new int;
		phsp->flows_[k][2] = new int;
		*phsp->flows_[k][0] = -1;
		*phsp->flows_[k][1] = -1;
		*phsp->flows_[k][2] = -1;
	}
	if (handover_){
		// handover procedure
		for (k=0; k<MAX_NUM_FLOWS; k++){
			if (apps_[k].flowid_ > 0){
				// inform the new Node B about the flows already running, and their mode
				*phsp->flows_[i][0] = rlc_->get_acked(apps_[k].flowid_);
				*phsp->flows_[i][1] = rlc_->get_fraged(apps_[k].flowid_);
				*phsp->flows_[i][2] = apps_[k].flowid_;
				i++;
			}
		}
	}


	ihsp->saddr() = node_->address();

	lhsp->lltype() = LL_SETUP;
	if (verbose_) printf("UE %d at %f RRC: Trying to Switched ON......\n",  ip_ue_, NOW);
	s.schedule(downtarget_, sp, delay_);  // send the packet down through the scheduler

	return;
}

// for switching ON the mobile
void LLUE::switch_on(void)
{
	ue_state_ = 1;	// change the state in RRC from 0 to 1
	phy_->ue_state_ = 1;	// change the state in physical layer from 0 to 1
	send_setup();	// begin cell search procedure
	return;
}

// register a new flow in RLC layer
void LLUE::update_flow(int acked, int fraged, int flowid)
{
	if (verbose_) printf("UE %d at %f RRC: Update_flow: ack, frag, flowid [%d %d %d]\n", ip_ue_, NOW, acked, fraged, flowid);
	rlc_->store_flow(acked, fraged, flowid);   // register the flow with its characteristics
	return;
}

// configure a new flow in RRC layer
void LLUE::configure_flow(int flow, const char*const& type , double rate)
{

	int acked, fraged;
	Chan_Coding code;

	// depending on the type of application, chose the mode (ACK or non-ACK),
	// the channel coding and if is necessary fragmentation (default fragmentation)
	if (strcmp(type, "audio") == 0) {
		code = TURBO;	// turbo coding
		fraged = 1;		// fragmentation
		acked = 0;		// non-ACK mode
	}
	if (strcmp(type, "video") == 0) {
		code = TURBO;	// turbo coding
		fraged = 1;		// fragmentation
		acked = 0;		// non-ACK mode
	}
	if (strcmp(type, "mail") == 0) {
		code = CONV_THIRD;	// convolutional third
		fraged = 1;		// fragmentation
		acked = 1;		// ACK mode
	}
	if (strcmp(type, "fax") == 0) {
		code = CONV_HALF;	// convolutional half
		fraged = 1;		// fragmentation
		acked = 0;		// non-ACK mode
	}
	if (strcmp(type, "speech") == 0) {
		code = CONV_HALF;	// convolutional half
		fraged = 1;		// fragmentation
		acked = 0;		// non-ACK mode
	}
	if (strcmp(type, "ftp") == 0) {
		code = TURBO;	// turbo coding
		fraged = 1;		// fragmentation
		acked = 1;		// ACK mode
	}
	if (strcmp(type, "http") == 0) {
		code = CONV_HALF;	// convolutional half
		fraged = 1;		// fragmentation
		acked = 1;		// ACK mode
	}

	// register the new flow with its characteristics in the apps_[] array
	int i = insert_flow(flow, rate, code);
	if (i == -1) {
		// too many applications in this terminal
		if (verbose_) printf("UE %d at %f RRC: ERROR: Trying to allocate in UE %d more than the MAX_NUM_FLOWS %d permissible\n"
			,ip_ue_, NOW, MAX_NUM_FLOWS);
		exit(-1);
	}
	// register the new flow in RLC layer
	update_flow(acked, fraged, flow);
	return;
}

// remove resources allocated for a flow
void LLUE::remove_flow(Packet* p)
{
	int i;
	hdr_ip *ih = HDR_IP(p);
	// looks for the flow in the array
	for (i=0; i<MAX_NUM_FLOWS; i++) {
		if (apps_[i].flowid_ == ih->flowid()){
			break;
		}
	}
	rlc_->remove_flow(apps_[i].flowid_);	// remove resources from RLC
	ifq_->reg(apps_[i].flowid_,0.0);		// remove resources from IFQ
	// remove resources from RRC layer
	apps_[i].flowid_ = -1;
	apps_[i].dest_ = -1;
	apps_[i].wait_ = -1;
	apps_[i].sf_ = -1;
	apps_[i].rate_ = -1;
	apps_[i].user_rate_ = -1;
	apps_[i].interval_ = -1;
	apps_[i].c_coding_ = CONV_HALF;

	update_phy_bytes_slot();			// remove resources from PHY

	Packet::free(p);
	p = NULL;

	return;

}

// begin the release procedure
void LLUE::AppsHandler(int flow)
{
	// The application has finished;
	// we have to send a release request to the Node B and to the node destiny
	Scheduler& s = Scheduler::instance();
	int pos;
	// look for the flow
	for (pos=0; pos<MAX_NUM_FLOWS; pos++) {
		if (apps_[pos].flowid_ == flow)
			break;
	}

	Packet* sp = Packet::alloc();
	struct hdr_cmn *chsp = HDR_CMN(sp);
	struct hdr_ll *lhsp = HDR_LL(sp);
	struct hdr_ip *ihsp = HDR_IP(sp);
	struct hdr_phy *phsp = HDR_PHY_UMTS(sp);

	// fill physical, ll, common and ip headers
	lhsp->lltype() = LL_RELEASE_REQ;
	lhsp->tx_rate() = apps_[pos].rate_;
	lhsp->paging_ok_ = 0;

	phsp->sa() = ue_address_;
	phsp->da() = nodeb_address_;
	phsp->c_coding() = CONV_HALF;

	chsp->channel_t() = CCCH;  // ch allocation
	chsp->next_hop_ = ip_nodeb_;
	chsp->direction() = hdr_cmn::DOWN;
	chsp->size() = 5;
	chsp->error() = 0;

	ihsp->flowid() = apps_[pos].flowid_;
	ihsp->saddr() = ip_ue_;
	ihsp->daddr() = apps_[pos].dest_;

	if (verbose_) printf("\nUE %d at %f RRC: ******************* sending RELEASE_REQ to ue(ip): %d\n",  ip_ue_, NOW, Address::instance().get_nodeaddr(ihsp->daddr()));
	s.schedule(downtarget_, sp->copy(), delay_);   // send the packet down through the scheduler

	Packet::free(sp);
	sp = NULL;

	return;
}