int srslte_ue_mib_sync_decode(srslte_ue_mib_sync_t * q,
uint32_t max_frames_timeout,
uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN],
uint32_t *nof_tx_ports,
int *sfn_offset)
{
int ret = SRSLTE_ERROR_INVALID_INPUTS;
cf_t *sf_buffer = NULL;
uint32_t nof_frames = 0;
int mib_ret = SRSLTE_UE_MIB_NOTFOUND;
if (q != NULL)
{
ret = SRSLTE_SUCCESS;
do {
mib_ret = SRSLTE_UE_MIB_NOTFOUND;
ret = srslte_ue_sync_get_buffer(&q->ue_sync, &sf_buffer);
if (ret < 0) {
fprintf(stderr, "Error calling srslte_ue_sync_work()\n");
break;
} else if (srslte_ue_sync_get_sfidx(&q->ue_sync) == 0) {
if (ret == 1) {
mib_ret = srslte_ue_mib_decode(&q->ue_mib, sf_buffer, bch_payload, nof_tx_ports, sfn_offset);
} else {
DEBUG("Resetting PBCH decoder after %d frames\n", q->ue_mib.frame_cnt);
srslte_ue_mib_reset(&q->ue_mib);
}
nof_frames++;
}
} while (mib_ret == SRSLTE_UE_MIB_NOTFOUND && ret >= 0 && nof_frames < max_frames_timeout);
if (mib_ret < 0) {
ret = mib_ret;
}
}
return mib_ret;
}
int main(int argc, char **argv) {
int ret;
cf_t *sf_buffer;
prog_args_t prog_args;
srslte_cell_t cell;
int64_t sf_cnt;
srslte_ue_sync_t ue_sync;
srslte_ue_mib_t ue_mib;
void *uhd;
srslte_ue_dl_t ue_dl;
srslte_ofdm_t fft;
srslte_chest_dl_t chest;
uint32_t nframes=0;
uint32_t nof_trials = 0;
uint32_t sfn = 0; // system frame number
int n;
uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];
uint32_t sfn_offset;
float rssi_utra=0,rssi=0, rsrp=0, rsrq=0, snr=0;
cf_t *ce[SRSLTE_MAX_PORTS];
if (parse_args(&prog_args, argc, argv)) {
exit(-1);
}
if (prog_args.uhd_gain > 0) {
printf("Opening UHD device...\n");
if (cuhd_open(prog_args.uhd_args, &uhd)) {
fprintf(stderr, "Error opening uhd\n");
exit(-1);
}
cuhd_set_rx_gain(uhd, prog_args.uhd_gain);
} else {
printf("Opening UHD device with threaded RX Gain control ...\n");
if (cuhd_open_th(prog_args.uhd_args, &uhd, false)) {
fprintf(stderr, "Error opening uhd\n");
exit(-1);
}
cuhd_set_rx_gain(uhd, 50);
}
sigset_t sigset;
sigemptyset(&sigset);
sigaddset(&sigset, SIGINT);
sigprocmask(SIG_UNBLOCK, &sigset, NULL);
signal(SIGINT, sig_int_handler);
cuhd_set_master_clock_rate(uhd, 30.72e6);
/* set receiver frequency */
cuhd_set_rx_freq(uhd, (double) prog_args.uhd_freq);
cuhd_rx_wait_lo_locked(uhd);
printf("Tunning receiver to %.3f MHz\n", (double ) prog_args.uhd_freq/1000000);
uint32_t ntrial=0;
do {
ret = cuhd_search_and_decode_mib(uhd, &cell_detect_config, prog_args.force_N_id_2, &cell);
if (ret < 0) {
fprintf(stderr, "Error searching for cell\n");
exit(-1);
} else if (ret == 0 && !go_exit) {
printf("Cell not found after %d trials. Trying again (Press Ctrl+C to exit)\n", ntrial++);
}
} while (ret == 0 && !go_exit);
if (go_exit) {
exit(0);
}
/* set sampling frequency */
int srate = srslte_sampling_freq_hz(cell.nof_prb);
if (srate != -1) {
if (srate < 10e6) {
cuhd_set_master_clock_rate(uhd, 4*srate);
} else {
cuhd_set_master_clock_rate(uhd, srate);
}
printf("Setting sampling rate %.2f MHz\n", (float) srate/1000000);
float srate_uhd = cuhd_set_rx_srate(uhd, (double) srate);
if (srate_uhd != srate) {
fprintf(stderr, "Could not set sampling rate\n");
exit(-1);
}
} else {
fprintf(stderr, "Invalid number of PRB %d\n", cell.nof_prb);
exit(-1);
}
INFO("Stopping UHD and flushing buffer...\n",0);
cuhd_stop_rx_stream(uhd);
cuhd_flush_buffer(uhd);
if (srslte_ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper, uhd)) {
fprintf(stderr, "Error initiating ue_sync\n");
return -1;
}
if (srslte_ue_dl_init(&ue_dl, cell)) {
fprintf(stderr, "Error initiating UE downlink processing module\n");
return -1;
}
if (srslte_ue_mib_init(&ue_mib, cell)) {
fprintf(stderr, "Error initaiting UE MIB decoder\n");
return -1;
}
/* Configure downlink receiver for the SI-RNTI since will be the only one we'll use */
srslte_ue_dl_set_rnti(&ue_dl, SRSLTE_SIRNTI);
/* Initialize subframe counter */
sf_cnt = 0;
if (srslte_ofdm_rx_init(&fft, cell.cp, cell.nof_prb)) {
fprintf(stderr, "Error initiating FFT\n");
return -1;
}
if (srslte_chest_dl_init(&chest, cell)) {
fprintf(stderr, "Error initiating channel estimator\n");
return -1;
}
int sf_re = SRSLTE_SF_LEN_RE(cell.nof_prb, cell.cp);
cf_t *sf_symbols = srslte_vec_malloc(sf_re * sizeof(cf_t));
for (int i=0;i<SRSLTE_MAX_PORTS;i++) {
ce[i] = srslte_vec_malloc(sizeof(cf_t) * sf_re);
}
cuhd_start_rx_stream(uhd);
float rx_gain_offset = 0;
/* Main loop */
while ((sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1) && !go_exit) {
ret = srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
if (ret < 0) {
fprintf(stderr, "Error calling srslte_ue_sync_work()\n");
}
/* srslte_ue_sync_get_buffer returns 1 if successfully read 1 aligned subframe */
if (ret == 1) {
switch (state) {
case DECODE_MIB:
if (srslte_ue_sync_get_sfidx(&ue_sync) == 0) {
srslte_pbch_decode_reset(&ue_mib.pbch);
n = srslte_ue_mib_decode(&ue_mib, sf_buffer, bch_payload, NULL, &sfn_offset);
if (n < 0) {
fprintf(stderr, "Error decoding UE MIB\n");
return -1;
} else if (n == SRSLTE_UE_MIB_FOUND) {
srslte_pbch_mib_unpack(bch_payload, &cell, &sfn);
printf("Decoded MIB. SFN: %d, offset: %d\n", sfn, sfn_offset);
sfn = (sfn + sfn_offset)%1024;
state = DECODE_SIB;
}
}
break;
case DECODE_SIB:
/* We are looking for SI Blocks, search only in appropiate places */
if ((srslte_ue_sync_get_sfidx(&ue_sync) == 5 && (sfn%2)==0)) {
n = srslte_ue_dl_decode_rnti_rv(&ue_dl, sf_buffer, data, srslte_ue_sync_get_sfidx(&ue_sync), SRSLTE_SIRNTI,
((int) ceilf((float)3*(((sfn)/2)%4)/2))%4);
if (n < 0) {
fprintf(stderr, "Error decoding UE DL\n");fflush(stdout);
return -1;
} else if (n == 0) {
printf("CFO: %+6.4f KHz, SFO: %+6.4f Khz, NOI: %.2f, PDCCH-Det: %.3f\r",
srslte_ue_sync_get_cfo(&ue_sync)/1000, srslte_ue_sync_get_sfo(&ue_sync)/1000,
srslte_sch_average_noi(&ue_dl.pdsch.dl_sch),
(float) ue_dl.nof_detected/nof_trials);
nof_trials++;
} else {
printf("Decoded SIB1. Payload: ");
srslte_vec_fprint_byte(stdout, data, n/8);;
state = MEASURE;
}
}
break;
case MEASURE:
if (srslte_ue_sync_get_sfidx(&ue_sync) == 5) {
/* Run FFT for all subframe data */
srslte_ofdm_rx_sf(&fft, sf_buffer, sf_symbols);
srslte_chest_dl_estimate(&chest, sf_symbols, ce, srslte_ue_sync_get_sfidx(&ue_sync));
rssi = SRSLTE_VEC_EMA(srslte_vec_avg_power_cf(sf_buffer,SRSLTE_SF_LEN(srslte_symbol_sz(cell.nof_prb))),rssi,0.05);
rssi_utra = SRSLTE_VEC_EMA(srslte_chest_dl_get_rssi(&chest),rssi_utra,0.05);
rsrq = SRSLTE_VEC_EMA(srslte_chest_dl_get_rsrq(&chest),rsrq,0.05);
rsrp = SRSLTE_VEC_EMA(srslte_chest_dl_get_rsrp(&chest),rsrp,0.05);
snr = SRSLTE_VEC_EMA(srslte_chest_dl_get_snr(&chest),snr,0.05);
nframes++;
}
if ((nframes%100) == 0 || rx_gain_offset == 0) {
if (cuhd_has_rssi(uhd)) {
rx_gain_offset = 10*log10(rssi)-cuhd_get_rssi(uhd);
} else {
rx_gain_offset = cuhd_get_rx_gain(uhd);
}
}
// Plot and Printf
if ((nframes%10) == 0) {
printf("CFO: %+8.4f KHz, SFO: %+8.4f Khz, RSSI: %5.1f dBm, RSSI/ref-symbol: %+5.1f dBm, "
"RSRP: %+5.1f dBm, RSRQ: %5.1f dB, SNR: %5.1f dB\r",
srslte_ue_sync_get_cfo(&ue_sync)/1000, srslte_ue_sync_get_sfo(&ue_sync)/1000,
10*log10(rssi*1000) - rx_gain_offset,
10*log10(rssi_utra*1000)- rx_gain_offset,
10*log10(rsrp*1000) - rx_gain_offset,
10*log10(rsrq), 10*log10(snr));
if (srslte_verbose != SRSLTE_VERBOSE_NONE) {
printf("\n");
}
}
break;
}
if (srslte_ue_sync_get_sfidx(&ue_sync) == 9) {
sfn++;
if (sfn == 1024) {
sfn = 0;
}
}
} else if (ret == 0) {
printf("Finding PSS... Peak: %8.1f, FrameCnt: %d, State: %d\r",
srslte_sync_get_peak_value(&ue_sync.sfind),
ue_sync.frame_total_cnt, ue_sync.state);
}
sf_cnt++;
} // Main loop
srslte_ue_sync_free(&ue_sync);
cuhd_close(uhd);
printf("\nBye\n");
exit(0);
}
int main(int argc, char **argv) {
int ret;
srslte_cell_t cell;
srslte_ue_mib_t ue_mib;
#ifndef DISABLE_RF
srslte_rf_t rf;
#endif
int n;
uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];
int sfn_offset;
uint32_t sfn_target = 0;
uint32_t sf_target = 0;
uint32_t ncce_target = 0;
uint32_t L_target = 0;
uint32_t cfi_target = 0;
FILE *fid;
uint16_t rnti_tmp;
parse_args(&prog_args, argc, argv);
/* If reading from file, go straight to PDSCH decoding. Otherwise, decode MIB first */
if (prog_args.input_file_name) {
/* preset cell configuration */
cell.id = prog_args.file_cell_id;
cell.cp = SRSLTE_CP_NORM;
cell.phich_length = SRSLTE_PHICH_NORM;
cell.phich_resources = SRSLTE_PHICH_R_1;
cell.nof_ports = prog_args.file_nof_ports;
cell.nof_prb = prog_args.file_nof_prb;
if (srslte_ue_sync_init_file(&ue_sync, prog_args.file_nof_prb,
prog_args.input_file_name, prog_args.file_offset_time, prog_args.file_offset_freq)) {
fprintf(stderr, "Error initiating ue_sync\n");
exit(-1);
}
}
if (srslte_ue_mib_init(&ue_mib, cell)) {
fprintf(stderr, "Error initaiting UE MIB decoder\n");
exit(-1);
}
if (srslte_ue_dl_init(&ue_dl, cell)) { // This is the User RNTI
fprintf(stderr, "Error initiating UE downlink processing module\n");
exit(-1);
}
/* Configure downlink receiver for the SI-RNTI since will be the only one we'll use */
srslte_ue_dl_set_rnti(&ue_dl, prog_args.rnti);
/* Initialize subframe counter */
if (prog_args.rnti_to_fix != NULL) {
fid = fopen(prog_args.rnti_to_fix,"r");
for (int i=0;i<65536;i++) {
if (fscanf(fid,"%d",&rnti_tmp) != EOF) {
// if (rnti_tmp) printf("rnti %d val %d\n", i, rnti_tmp);
srslte_ue_dl_reset_rnti_user_to(&ue_dl, i, rnti_tmp); // check this
//printf("is rnti in the list? %d\n",rnti_in_list(&ue_dl, rnti_tmp));
}
}
fclose(fid);
}
ue_sync.correct_cfo = !prog_args.disable_cfo;
srslte_pbch_decode_reset(&ue_mib.pbch);
INFO("\nEntering main loop...\n\n", 0);
/* Main loop */
ret = srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
if (ret < 0) {
fprintf(stderr, "Error calling srslte_ue_sync_work()\n");
}
if (ret == 7) {
go_exit = true;
}
if (ret == 1) {
if (srslte_ue_sync_get_sfidx(&ue_sync) == 0) {
n = srslte_ue_mib_decode(&ue_mib, sf_buffer, bch_payload, NULL, &sfn_offset);
if (n < 0) {
fprintf(stderr, "Error decoding UE MIB\n");
exit(-1);
} else if (n == SRSLTE_UE_MIB_FOUND) {
srslte_pbch_mib_unpack(bch_payload, &cell, &sfn);
//srslte_cell_fprint(stdout, &cell, sfn);
//printf("Decoded MIB. SFN: %d, offset: %d\n", sfn, sfn_offset);
sfn = (sfn + sfn_offset)%1024;
}
}
} // Main loop
#define M_OFF 500
float tprob[M_OFF];
float bprob = 0;
int b_offset = 0, b_offset2 = 0;
int i, j, k;
int t_offset, l_offset, m_offset = 30*ue_sync.sf_len/11520;
uint16_t rnti_cand[M_OFF];
uint16_t rnti_cnt[M_OFF][2];
int rnti_off[M_OFF];
uint16_t bcnt = 0;
float rnti_bprob[M_OFF];
int found = 0;
fid = fopen(prog_args.to_fix,"r");
bzero(tprob, sizeof(tprob));
while (fscanf(fid,"%d %d %d %d %d",&sfn_target, &sf_target, &ncce_target, &L_target, &cfi_target) != EOF) {
// printf("checking sfn %d sf %d, ncce %d, L %d \n",sfn_target,sf_target, ncce_target, L_target);
bprob = 0;
b_offset = 0;
b_offset2 = 0;
bcnt = 0;
found = 0;
if (sfn == sfn_target && sf_target == 0) {
l_offset = 0;
} else {
srslte_filesource_seek(&ue_sync.file_source, ((sfn_target-sfn)*10+sf_target)*ue_sync.sf_len-m_offset);
srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
l_offset = -m_offset;
}
for (i=0; i<m_offset+1; i++) {
for (k=0; k<2 && !found; k++) {
if ((i==0 && k==1) || (l_offset==0 && k==1)) {
} else {
if (k==0) t_offset = i;
if (k==1) t_offset = -i;
//printf("checking offset %d for sfn %d sf %d (%d.%d)\n",t_offset,sfn_target,sf_target,i,k);
tprob[t_offset-l_offset] = srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[t_offset-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 0);
rnti_cand[t_offset-l_offset] = ue_dl.current_rnti;
rnti_cnt[t_offset-l_offset][0] = rnti_cand[t_offset-l_offset];
rnti_cnt[t_offset-l_offset][1] = 1;
rnti_off[t_offset-l_offset] = t_offset;
rnti_bprob[t_offset-l_offset] = tprob[t_offset-l_offset];
if ((tprob[t_offset-l_offset] >= 97 && tprob[t_offset-l_offset] <=101) || tprob[t_offset-l_offset] >= 197) {
//printf("Early winner...\n");
srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[t_offset-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 1);
found = 1;
break;
}
for (j = 0; j < t_offset-l_offset; j++) {
if (rnti_cnt[j][0] == rnti_cnt[t_offset-l_offset][0] && rnti_bprob[t_offset-l_offset] > 90) {
rnti_cnt[j][1]++;
//printf("at offset %d counting rnti %x cnt %d prob %.3f\n", t_offset, rnti_cnt[j][0], rnti_cnt[j][1], rnti_bprob[j]);
if (rnti_bprob[j] < rnti_bprob[t_offset-l_offset]) {
rnti_bprob[j] = rnti_bprob[t_offset-l_offset];
rnti_off[j] = t_offset;
//printf("at offset %d updating rnti %x cnt %d prob %.3f\n", t_offset, rnti_cnt[j][0], rnti_cnt[j][1], rnti_bprob[j]);
}
}
}
}
}
}
// for (t_offset = l_offset; t_offset < (m_offset+1); t_offset++) {
// //printf("checking offset %d for sfn %d sf %d\n",t_offset,sfn_target,sf_target);
// tprob[t_offset-l_offset] = srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[t_offset-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 0);
// rnti_cand[t_offset-l_offset] = ue_dl.current_rnti;
// rnti_cnt[t_offset-l_offset][0] = rnti_cand[t_offset-l_offset];
// rnti_cnt[t_offset-l_offset][1] = 1;
// rnti_off[t_offset-l_offset] = t_offset;
// rnti_bprob[t_offset-l_offset] = tprob[t_offset-l_offset];
//
// if ((tprob[t_offset-l_offset] >= 97 && tprob[t_offset-l_offset] <=101) || tprob[t_offset-l_offset] >= 197) {
// //printf("Early winner...\n");
// srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[t_offset-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 1);
// found = 1;
// break;
// }
//
// for (j = 0; j < t_offset-l_offset; j++) {
// if (rnti_cnt[j][0] == rnti_cnt[t_offset-l_offset][0] && rnti_bprob[t_offset-l_offset] > 90) {
// rnti_cnt[j][1]++;
// //printf("at offset %d counting rnti %x cnt %d prob %.3f\n", t_offset, rnti_cnt[j][0], rnti_cnt[j][1], rnti_bprob[j]);
// if (rnti_bprob[j] < rnti_bprob[t_offset-l_offset]) {
// rnti_bprob[j] = rnti_bprob[t_offset-l_offset];
// rnti_off[j] = t_offset;
// //printf("at offset %d updating rnti %x cnt %d prob %.3f\n", t_offset, rnti_cnt[j][0], rnti_cnt[j][1], rnti_bprob[j]);
// }
// }
// }
// }
if (found == 0) {
for (j = 0; j < (m_offset*2+1); j++) {
//if (rnti_cnt[j][1] > 1 && rnti_bprob[j] > 90) printf("entry %d, rnti %x cnt %d prob %.3f offset %d\n", j, rnti_cnt[j][0], rnti_cnt[j][1], rnti_bprob[j], rnti_off[j]);
if (rnti_cnt[j][1] > bcnt) {
bcnt = rnti_cnt[j][1];
b_offset = rnti_off[j];
}
if (rnti_cnt[j][1] > 1 && rnti_bprob[j] > bprob) {
bprob = rnti_bprob[j];
b_offset2 = rnti_off[j];
}
}
if (rnti_cand[b_offset-l_offset] == rnti_cand[b_offset2-l_offset]) {
if (rnti_bprob[b_offset-l_offset] >= rnti_bprob[b_offset2-l_offset] && rnti_bprob[b_offset-l_offset] >= 97) {
//printf("Most popular at offset %d...\n",b_offset);
//srslte_filesource_seek(&ue_sync.file_source, ((sfn_target-sfn)*10+sf_target)*ue_sync.sf_len+b_offset);
//srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[b_offset-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 1);
} else if (rnti_bprob[b_offset2-l_offset] >= 97) {
//printf("Most likely not unique at offset %d...\n",b_offset2);
//srslte_filesource_seek(&ue_sync.file_source, ((sfn_target-sfn)*10+sf_target)*ue_sync.sf_len+b_offset2);
//srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[b_offset2-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 1);
}
} else {
//printf("Most popular at offset %d...\n",b_offset);
//srslte_filesource_seek(&ue_sync.file_source, ((sfn_target-sfn)*10+sf_target)*ue_sync.sf_len+b_offset);
//srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
if (rnti_bprob[b_offset-l_offset] >= 95) srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[b_offset-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 1);
//printf("Most likely not unique at offset %d...\n",b_offset2);
//srslte_filesource_seek(&ue_sync.file_source, ((sfn_target-sfn)*10+sf_target)*ue_sync.sf_len+b_offset2);
//srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
if (rnti_bprob[b_offset2-l_offset] >= 95) srslte_ue_dl_fix_control_ra(&ue_dl, &sf_buffer[b_offset2-l_offset], data, sf_target, 0, sfn_target, ncce_target, L_target, cfi_target, 1);
//if (rnti_bprob[b_offset2-l_offset] < 98 && rnti_bprob[b_offset-l_offset] < 98) printf("nothing found in %d.%d L=%d,%d,%d\n",sfn_target,sf_target,ncce_target, L_target, cfi_target);
}
}
//if (sfn_target > 0) exit(0);
}
srslte_ue_dl_free(&ue_dl);
srslte_ue_sync_free(&ue_sync);
#ifndef DISABLE_RF
if (!prog_args.input_file_name) {
srslte_ue_mib_free(&ue_mib);
srslte_rf_close(&rf);
}
#endif
//printf("\nBye\n");
exit(0);
}