/*--------------------------------------------------------------------------------
* Function: wban_up0_traffic_generate
*
* Description: creates a MSDU requiring acknowledge based on the MSDU generation
* specifications of the source model and sends it to the lower layer.
*
* No parameters
*--------------------------------------------------------------------------------*/
static void wban_up0_traffic_generate() {
Packet* msdu_ptr;
Packet* app_traffic_ptr;
int msdu_size; /* size in bits */
double next_intarr_time; /* interarrival time of next MSDU */
double abs_next_intarr_time; /* absolute interarrival time of next MSDU */
/* Stack tracing enrty point */
FIN (wban_up0_traffic_generate);
/* Generate a MSDU size outcome. */
msdu_size = (int) ceil (oms_dist_outcome (up0_msdu_size_dist_ptr));
/* 0 <= MAC frame body <= pMaxFrameBodyLength_Bits */
if (msdu_size > pMaxFrameBodyLength_Bits)
msdu_size = pMaxFrameBodyLength_Bits; /* The size of generated MSDU is bigger than the maximum - the size is set to the maximum. */
if (msdu_size < 0)
msdu_size = 0;
/* We produce unformatted packets. Create one. */
msdu_ptr = op_pk_create (msdu_size);
/* create a App traffic frame that encapsulates the msdu packet */
app_traffic_ptr = op_pk_create_fmt ("wban_app_traffic_format");
/* increment the data sequence number by 1 at a time */
dataSN = (dataSN + 1) % 32768;
op_pk_nfd_set (app_traffic_ptr, "App Sequence Number", dataSN);
op_pk_nfd_set (app_traffic_ptr, "User Priority", 0);
op_pk_nfd_set_pkt (app_traffic_ptr, "MSDU Payload", msdu_ptr); // wrap msdu in app traffic
/* schedule next MSDU generation */
next_intarr_time = oms_dist_outcome (up0_msdu_interarrival_dist_ptr);
/* Make sure that interarrival time is not negative. In that case it will be set to 0. */
if (next_intarr_time <0)
next_intarr_time = 0.0;
abs_next_intarr_time = op_sim_time () + next_intarr_time;
// printf(" [Node %s] t = %f, msdu_create_time = %f, app_pkt_create_time = %f\n", \
// node_name, op_sim_time(), op_pk_creation_time_get(msdu_ptr), op_pk_creation_time_get(app_traffic_ptr));
/* send the App traffic via the stream to the lower layer. */
op_pk_send (app_traffic_ptr, STRM_FROM_UP_TO_MAC);
// printf (" [Node %s] t= %f -> UP7 MSDU (size = %d bits) \
// was generated and sent to MAC layer.\n", node_name, op_sim_time(), msdu_size);
if ((abs_next_intarr_time <= up0_stop_time) || (up0_stop_time == SC_INFINITE_TIME)) {
up0_next_msdu_evh = op_intrpt_schedule_self (abs_next_intarr_time, SC_GENERATE_UP0);
// printf ("\t Next UP0 MSDU will be generated at %f\n\n", abs_next_intarr_time);
}
/* Stack tracing exit point */
FOUT;
}
void ra_aloha_ss_intrpt_strm_handler(void)
{
Packet* sduptr;
Packet* pduptr;
int istrm;
int ss_id;
char pk_fmt_str[64];
static Boolean wait_ack_flag = OPC_FALSE;
static Evhandle tr_ack;
FIN(ra_aloha_ss_intrpt_strm_handler());
istrm = op_intrpt_strm();
if (istrm == svptr->istrm_hl) {
sduptr = op_pk_get(istrm);
if (wait_ack_flag) {
//What will happen if the subq overflows?
op_subq_pk_insert(0, sduptr, OPC_QPOS_TAIL);
if (op_prg_odb_ltrace_active("aloha")) {
op_prg_odb_print_major("Queueing a data packet.", OPC_NIL);
}
FOUT ;
}
buf_pkptr = op_pk_copy(sduptr);
pduptr = op_pk_create_fmt(Ra_Aloha_Data_Pk_Name );
op_stat_write(svptr->sh_load_bits, op_pk_total_size_get(sduptr));
op_stat_write(svptr->sh_load_bits, 0.0);
op_stat_write(svptr->gsh_load_bits, op_pk_total_size_get(sduptr));
op_stat_write(svptr->gsh_load_bits, 0.0);
op_pk_nfd_set_pkt(pduptr, "Data", sduptr);
op_pk_send(pduptr, svptr->ostrm_ll);
tr_ack = op_intrpt_schedule_self(Cur_Time + tr_len_ack, TR_ACK_TO);
wait_ack_flag = OPC_TRUE;
if (op_prg_odb_ltrace_active("aloha")) {
op_prg_odb_print_major("Sending a data packet.", OPC_NIL);
}
} else if (istrm == svptr->istrm_ll) {
pduptr = op_pk_get(istrm);
op_pk_format(pduptr, pk_fmt_str);
if (strcmp(pk_fmt_str, Ra_Aloha_Ack_Pk_Name)==0) {
op_pk_nfd_get_int32(pduptr, "SS ID", & ss_id);
if (ss_id != svptr->ss_id) {
op_pk_destroy(pduptr);
FOUT;
}
wait_ack_flag = OPC_FALSE;
//TODO: check whether the timer event is valid
op_ev_cancel(tr_ack);
//op_ev_cancel(svptr->tr_ack);
op_stat_write(svptr->sh_goodput_bits, op_pk_total_size_get(buf_pkptr));
op_stat_write(svptr->sh_goodput_bits, 0.0);
op_pk_destroy(buf_pkptr);
//the waiting queue is not empty, scheduing next tx
if (!op_subq_empty(0)) {
sduptr = ra_aloha_ss_dequeue();
buf_pkptr = op_pk_copy(sduptr);
pduptr = op_pk_create_fmt(Ra_Aloha_Data_Pk_Name );
op_pk_nfd_set(pduptr, "Data", sduptr);
op_pk_send(pduptr, svptr->ostrm_ll);
op_pk_send(pduptr, svptr->ostrm_ll);
tr_ack = op_intrpt_schedule_self(Cur_Time + tr_len_ack, TR_ACK_TO);
}
}
//op_pk_send(pduptr, svptr->ostrm_hl);
} //istrm_ll
FOUT;
}