5g-team
/
srsRAN_4G
mirror of https://github.com/pvnis/srsRAN_4G.git
2
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

PHICH working. PRACH example using UE ITF working

Browse Source
master
ismagom 10 years ago
parent c9b3ce0d06
commit 6eb3f1f484
35 changed files with 485 additions and 305 deletions
Show Stats Download Patch File Download Diff File

4
cuhd/include/srslte/cuhd/cuhd.h
Unescape Escape View File

@ -94,6 +94,10 @@ SRSLTE_API double cuhd_set_tx_freq_offset(void *h,
double freq,
double offset);
SRSLTE_API void cuhd_get_time(void *h,
time_t *secs,
double *frac_secs);
SRSLTE_API int cuhd_send(void *h,
void *data,
uint32_t nsamples,

1
cuhd/include/srslte/cuhd/radio_uhd.h
Unescape Escape View File

@ -43,6 +43,7 @@ namespace srslte {
bool init();
bool init(char *args);
void get_time(srslte_timestamp_t *now);
bool tx(void *buffer, uint32_t nof_samples, srslte_timestamp_t tx_time);
bool rx_now(void *buffer, uint32_t nof_samples, srslte_timestamp_t *rxd_time);
bool rx_at(void *buffer, uint32_t nof_samples, srslte_timestamp_t rx_time);

12
cuhd/lib/cuhd_imp.cpp
Unescape Escape View File

@ -121,7 +121,7 @@ int cuhd_open(char *args, void **h)
{
cuhd_handler *handler = new cuhd_handler();
std::string _args = std::string(args);
handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000" + ", num_recv_frames=512");
handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000");
// handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=50000000" + ", num_recv_frames=512");
handler->usrp->set_clock_source("internal");
@ -273,6 +273,16 @@ double cuhd_set_tx_freq_offset(void *h, double freq, double off) {
return handler->usrp->get_tx_freq();
}
void cuhd_get_time(void *h, time_t *secs, double *frac_secs) {
cuhd_handler *handler = static_cast < cuhd_handler * >(h);
uhd::time_spec_t now = handler->usrp->get_time_now();
if (secs) {
*secs = now.get_full_secs();
}
if (frac_secs) {
*frac_secs = now.get_frac_secs();
}
}
int cuhd_send(void *h, void *data, uint32_t nsamples, bool blocking)
{

4
cuhd/lib/radio_uhd.cc
Unescape Escape View File

@ -62,6 +62,10 @@ bool radio_uhd::rx_now(void* buffer, uint32_t nof_samples, srslte_timestamp_t* r
}
}
void radio_uhd::get_time(srslte_timestamp_t *now) {
cuhd_get_time(uhd, &now->full_secs, &now->frac_secs);
}
bool radio_uhd::tx(void* buffer, uint32_t nof_samples, srslte_timestamp_t tx_time)
{
if (cuhd_send_timed(uhd, buffer, nof_samples, tx_time.full_secs, tx_time.frac_secs) > 0) {

96
srslte/examples/prach_ue.c
Unescape Escape View File

@ -285,9 +285,6 @@ int rar_unpack(uint8_t *buffer, rar_msg_t *msg)
return(ret);
}
#define kk
#define use_usrp
int main(int argc, char **argv) {
int ret;
srslte_cell_t cell;
@ -308,7 +305,6 @@ int main(int argc, char **argv) {
parse_args(&prog_args, argc, argv);
#ifdef use_usrp
printf("Opening UHD device...\n");
if (cuhd_open(prog_args.uhd_args, &uhd)) {
fprintf(stderr, "Error opening uhd\n");
@ -329,9 +325,7 @@ int main(int argc, char **argv) {
cuhd_set_tx_freq_offset(uhd, prog_args.uhd_tx_freq, prog_args.uhd_tx_freq_offset);
printf("Tunning TX receiver to %.3f MHz\n", (double ) prog_args.uhd_tx_freq/1000000);
#endif
#ifdef kk
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");
@ -340,16 +334,6 @@ int main(int argc, char **argv) {
printf("Cell not found\n");
exit(0);
}
#else
cell.id = 1;
cell.nof_ports = 1;
cell.nof_prb = 25;
cell.cp = SRSLTE_CP_NORM;
cell.phich_length = SRSLTE_PHICH_NORM;
cell.phich_resources = SRSLTE_PHICH_R_1;
#endif
#ifdef use_usrp
/* set sampling frequency */
int srate = srslte_sampling_freq_hz(cell.nof_prb);
@ -365,7 +349,6 @@ int main(int argc, char **argv) {
cuhd_stop_rx_stream(uhd);
cuhd_flush_buffer(uhd);
#endif
if (srslte_ue_mib_init(&ue_mib, cell)) {
fprintf(stderr, "Error initaiting UE MIB decoder\n");
@ -392,6 +375,8 @@ int main(int argc, char **argv) {
exit(-1);
}
srslte_ue_ul_set_cfo_enable(&ue_ul, true);
srslte_pusch_hopping_cfg_t hop_cfg;
bzero(&hop_cfg, sizeof(srslte_pusch_hopping_cfg_t));
srslte_refsignal_drms_pusch_cfg_t drms_cfg;
@ -421,38 +406,27 @@ int main(int argc, char **argv) {
sf_cnt = 0;
#ifdef use_usrp
if (srslte_ue_sync_init(&ue_sync, cell, cuhd_recv_wrapper_timed, uhd)) {
fprintf(stderr, "Error initiating ue_sync\n");
exit(-1);
}
cuhd_start_rx_stream(uhd);
#endif
uint16_t ra_rnti;
uint32_t conn_setup_trial = 0;
uint32_t ul_sf_idx = 0;
#ifdef kk
// Register Ctrl+C handler
signal(SIGINT, sig_int_handler);
state = DECODE_MIB;
#else
state = RECV_RAR;
#endif
/* Main loop */
while (!go_exit && (sf_cnt < prog_args.nof_subframes || prog_args.nof_subframes == -1)) {
#ifdef kk
ret = srslte_ue_sync_get_buffer(&ue_sync, &sf_buffer);
if (ret < 0) {
fprintf(stderr, "Error calling srslte_ue_sync_work()\n");
}
#else
ret = 1;
srslte_timestamp_t rx_time, tx_time;
cf_t dummy[4];
#endif
/* srslte_ue_sync_get_buffer returns 1 if successfully read 1 aligned subframe */
if (ret == 1) {
@ -485,7 +459,6 @@ int main(int argc, char **argv) {
break;
case SEND_PRACH:
#ifdef kk
if (((sfn%2) == 1) && (srslte_ue_sync_get_sfidx(&ue_sync) == 1)) {
srslte_ue_sync_get_last_timestamp(&ue_sync, &uhd_time);
@ -497,27 +470,15 @@ int main(int argc, char **argv) {
cuhd_send_timed(uhd, prach_buffer, prach_buffer_len,
next_tx_time.full_secs, next_tx_time.frac_secs);
srslte_vec_save_file("prach_ue", prach_buffer, prach_buffer_len*sizeof(cf_t));
ra_rnti = 2;
rar_window_start = sfn+1;
rar_window_stop = sfn+3;
state = RECV_RAR;
}
#else
cuhd_recv_with_time(uhd, dummy, 4, 1, &rx_time.full_secs, &rx_time.frac_secs);
srslte_timestamp_copy(&tx_time, &rx_time);
printf("Transmitting PRACH...\n");
srslte_vec_save_file("srslte_prach_tx", prach_buffers[7], prach_buffer_len*sizeof(cf_t));
while(1) {
srslte_timestamp_add(&tx_time, 0, 0.001); // send every (10 ms)
cuhd_send_timed(uhd, prach_buffers[7], prach_buffer_len,
tx_time.full_secs, tx_time.frac_secs);
}
#endif
break;
case RECV_RAR:
#ifdef kk
if ((sfn == rar_window_start && srslte_ue_sync_get_sfidx(&ue_sync) > 3) || sfn > rar_window_start) {
printf("Looking for RAR in sfn: %d sf_idx: %d\n", sfn, srslte_ue_sync_get_sfidx(&ue_sync));
@ -527,11 +488,6 @@ int main(int argc, char **argv) {
} else if (n > 0) {
rar_unpack(data_rx, &rar_msg);
//if (rar_msg.RAPID != prog_args.preamble_idx) {
// printf("Found RAR for sequence %d\n", rar_msg.RAPID);
//} else {
//cuhd_stop_rx_stream(uhd);
//cuhd_flush_buffer(uhd);
rar_msg_fprint(stdout, &rar_msg);
srslte_dci_rar_to_ra_ul(rar_msg.rba, rar_msg.mcs, rar_msg.hopping_flag, cell.nof_prb, &ra_pusch);
@ -555,6 +511,10 @@ int main(int argc, char **argv) {
ra_pusch.rv_idx = rv[i];
ul_sf_idx = (srslte_ue_sync_get_sfidx(&ue_sync)+6+i*8)%10;
float cfo = srslte_ue_sync_get_cfo(&ue_sync)/15000;
printf("Setting CFO: %f (%f)\n", cfo, cfo*15000);
srslte_ue_ul_set_cfo(&ue_ul, cfo);
n = srslte_ue_ul_pusch_encode_rnti(&ue_ul, &ra_pusch, data, ul_sf_idx, rar_msg.temp_c_rnti, ul_signal);
if (n < 0) {
fprintf(stderr, "Error encoding PUSCH\n");
@ -577,8 +537,6 @@ int main(int argc, char **argv) {
//cuhd_start_rx_stream(uhd);
state = RECV_CONNSETUP;
conn_setup_trial = 0;
// }
}
}
@ -590,41 +548,6 @@ int main(int argc, char **argv) {
}
}
}
#else
ra_pusch.mcs.mod = SRSLTE_MOD_QPSK;
ra_pusch.mcs.tbs = 94;
ra_pusch.rv_idx = 0;
ra_pusch.prb_alloc.freq_hopping = 0;
ra_pusch.prb_alloc.L_prb = 4;
ra_pusch.prb_alloc.n_prb[0] = 19;
ra_pusch.prb_alloc.n_prb[1] = 19;
uint32_t ul_sf_idx = 4;
printf("L: %d\n", ra_pusch.prb_alloc.L_prb);
// srslte_ue_ul_set_cfo(&ue_ul, srslte_sync_get_cfo(&ue_sync.strack));
srslte_bit_pack_vector((uint8_t*) conn_request_msg, data, ra_pusch.mcs.tbs);
n = srslte_ue_ul_pusch_encode_rnti(&ue_ul, &ra_pusch, data, ul_sf_idx, 111, ul_signal);
if (n < 0) {
fprintf(stderr, "Error encoding PUSCH\n");
exit(-1);
}
srslte_vec_save_file("srslte_pusch_tx", ul_signal, SRSLTE_SF_LEN_PRB(cell.nof_prb)*sizeof(cf_t));
#ifdef use_usrp
cuhd_recv_with_time(uhd, dummy, 4, 1, &uhd_time.full_secs, &uhd_time.frac_secs);
srslte_timestamp_copy(&next_tx_time, &uhd_time);
while(1) {
srslte_timestamp_add(&next_tx_time, 0, 0.002); // send every 2 ms
cuhd_send_timed(uhd, ul_signal, SRSLTE_SF_LEN_PRB(cell.nof_prb),
next_tx_time.full_secs, next_tx_time.frac_secs);
}
#else
exit(-1);
#endif
#endif
break;
case RECV_CONNSETUP:
@ -641,6 +564,7 @@ int main(int argc, char **argv) {
} else if (n > 0) {
printf("Received ConnectionSetup len: %d.\n", n);
srslte_vec_fprint_hex(stdout, data_rx, n);
exit(0);
} else {
conn_setup_trial++;
if (conn_setup_trial == 20) {

1
srslte/include/srslte/common/radio.h
Unescape Escape View File

@ -40,6 +40,7 @@ namespace srslte {
class SRSLTE_API radio
{
public:
virtual void get_time(srslte_timestamp_t *now) = 0;
virtual bool tx(void *buffer, uint32_t nof_samples, srslte_timestamp_t tx_time) = 0;
virtual bool rx_now(void *buffer, uint32_t nof_samples, srslte_timestamp_t *rxd_time) = 0;
virtual bool rx_at(void *buffer, uint32_t nof_samples, srslte_timestamp_t rx_time) = 0;

14
srslte/include/srslte/phch/phich.h
Unescape Escape View File

@ -41,7 +41,7 @@
#include "srslte/mimo/precoding.h"
#include "srslte/mimo/layermap.h"
#include "srslte/modem/mod.h"
#include "srslte/modem/demod_hard.h"
#include "srslte/modem/demod_soft.h"
#include "srslte/scrambling/scrambling.h"
#include "regs.h"
@ -59,11 +59,6 @@
#define SRSLTE_PHICH_NORM_NSF 4
#define SRSLTE_PHICH_EXT_NSF 2
typedef struct SRSLTE_API {
uint32_t ngroup;
uint32_t nseq;
}srslte_phich_alloc_t;
/* phich object */
typedef struct SRSLTE_API {
srslte_cell_t cell;
@ -81,10 +76,11 @@ typedef struct SRSLTE_API {
/* bit message */
uint8_t data[SRSLTE_PHICH_NBITS];
float data_rx[SRSLTE_PHICH_NBITS];
/* tx & rx objects */
srslte_modem_table_t mod;
srslte_demod_hard_t demod;
srslte_demod_soft_t demod;
srslte_sequence_t seq[SRSLTE_NSUBFRAMES_X_FRAME];
srslte_precoding_t precoding;
@ -104,7 +100,7 @@ SRSLTE_API int srslte_phich_decode(srslte_phich_t *q,
uint32_t nseq,
uint32_t nsubframe,
uint8_t *ack,
uint32_t *distance);
float *distance);
SRSLTE_API int srslte_phich_encode(srslte_phich_t *q,
uint8_t ack,
@ -118,4 +114,6 @@ SRSLTE_API void srslte_phich_reset(srslte_phich_t *q,
SRSLTE_API uint32_t srslte_phich_ngroups(srslte_phich_t *q);
SRSLTE_API uint32_t srslte_phich_nsf(srslte_phich_t *q);
#endif // PHICH_

2
srslte/include/srslte/phch/ra.h
Unescape Escape View File

@ -130,6 +130,8 @@ typedef struct SRSLTE_API {
srslte_ra_mcs_t mcs;
uint32_t rv_idx; // If set to non-zero, a retransmission is requested with the same modulation
// than before (SRSLTE_DCI_FORMAT0 message, see also 8.6.1 in 36.2313).
uint32_t n_dmrs;
bool ndi;
bool cqi_request;

3
srslte/include/srslte/sync/sync.h
Unescape Escape View File

@ -137,6 +137,9 @@ SRSLTE_API int srslte_sync_get_cell_id(srslte_sync_t *q);
/* Gets the CFO estimation from the last call to synch_run() */
SRSLTE_API float srslte_sync_get_cfo(srslte_sync_t *q);
/* Sets known CFO to avoid long transients due to average */
SRSLTE_API void srslte_sync_set_cfo(srslte_sync_t *q, float cfo);
/* Gets the CP length estimation from the last call to synch_run() */
SRSLTE_API srslte_cp_t srslte_sync_get_cp(srslte_sync_t *q);

1
srslte/include/srslte/ue/ue_cell_search.h
Unescape Escape View File

@ -73,6 +73,7 @@ typedef struct SRSLTE_API {
float peak;
float mode;
float psr;
float cfo;
} srslte_ue_cellsearch_result_t;

8
srslte/include/srslte/ue/ue_dl.h
Unescape Escape View File

@ -39,6 +39,8 @@
#ifndef UEDL_H
#define UEDL_H
#include <stdbool.h>
#include "srslte/ch_estimation/chest_dl.h"
#include "srslte/dft/ofdm.h"
#include "srslte/common/phy_common.h"
@ -62,6 +64,7 @@ typedef struct SRSLTE_API {
srslte_pcfich_t pcfich;
srslte_pdcch_t pdcch;
srslte_pdsch_t pdsch;
srslte_phich_t phich;
srslte_harq_t harq_process[SRSLTE_UE_UL_NOF_HARQ_PROCESSES];
srslte_regs_t regs;
srslte_ofdm_t fft;
@ -132,6 +135,11 @@ SRSLTE_API int srslte_ue_dl_decode_rnti_rv(srslte_ue_dl_t * q,
uint16_t rnti,
uint32_t rvidx);
SRSLTE_API bool srslte_ue_dl_decode_phich(srslte_ue_dl_t *q,
uint32_t sf_idx,
uint32_t n_prb_lowest,
uint32_t n_dmrs);
SRSLTE_API void srslte_ue_dl_reset(srslte_ue_dl_t *q);
SRSLTE_API void srslte_ue_dl_set_rnti(srslte_ue_dl_t *q,

2
srslte/include/srslte/ue/ue_phy.h
Unescape Escape View File

@ -112,7 +112,7 @@ public:
dl_buffer(srslte_cell_t cell);
sched_grant get_ul_grant(pdcch_ul_search_t mode, uint32_t rnti);
sched_grant get_dl_grant(pdcch_dl_search_t mode, uint32_t rnti);
bool decode_phich(srslte_phich_alloc_t assignment);
bool decode_phich(sched_grant pusch_grant);
bool decode_pdsch(sched_grant pdsch_grant, uint8_t *payload); // returns true or false for CRC OK/KO
private:
srslte_ue_dl_t ue_dl;

3
srslte/include/srslte/ue/ue_sync.h
Unescape Escape View File

@ -128,6 +128,9 @@ SRSLTE_API uint32_t srslte_ue_sync_sf_len(srslte_ue_sync_t *q);
SRSLTE_API int srslte_ue_sync_get_buffer(srslte_ue_sync_t *q,
cf_t **sf_symbols);
SRSLTE_API void srslte_ue_sync_set_cfo(srslte_ue_sync_t *q,
float cfo);
SRSLTE_API void srslte_ue_sync_reset(srslte_ue_sync_t *q);
SRSLTE_API void srslte_ue_sync_set_N_id_2(srslte_ue_sync_t *q,

4
srslte/include/srslte/ue/ue_ul.h
Unescape Escape View File

@ -59,6 +59,7 @@ typedef struct SRSLTE_API {
srslte_cell_t cell;
bool normalize_en;
bool cfo_en;
float current_cfo;
@ -83,6 +84,9 @@ SRSLTE_API void srslte_ue_ul_free(srslte_ue_ul_t *q);
SRSLTE_API void srslte_ue_ul_set_cfo(srslte_ue_ul_t *q,
float cur_cfo);
SRSLTE_API void srslte_ue_ul_set_cfo_enable(srslte_ue_ul_t *q,
bool enabled);
SRSLTE_API void srslte_ue_ul_set_normalization(srslte_ue_ul_t *q,
bool enabled);

2
srslte/include/srslte/ue_itf/dl_buffer.h
Unescape Escape View File

@ -66,7 +66,7 @@ namespace ue {
bool recv_ue_sync(srslte_ue_sync_t *ue_sync, srslte_timestamp_t *rx_time);
bool get_ul_grant(pdcch_ul_search_t mode, sched_grant *grant);
bool get_dl_grant(pdcch_dl_search_t mode, sched_grant *grant);
bool decode_phich(srslte_phich_alloc_t assignment);
bool decode_phich(srslte::ue::sched_grant pusch_grant);
bool decode_pdsch(sched_grant pdsch_grant, uint8_t *payload); // returns true or false for CRC OK/KO
private:
params *params_db;

8
srslte/include/srslte/ue_itf/phy.h
Unescape Escape View File

@ -76,6 +76,9 @@ public:
// Indicate the PHY to send PRACH as soon as possible
bool send_prach(uint32_t preamble_idx);
// Returns TTI when PRACH was transmitted. -1 if not yet transmitted
int get_prach_transmitted_tti();
// Get handler to the radio
radio* get_radio();
@ -125,12 +128,15 @@ private:
pthread_t phy_thread;
float time_adv_sec;
uint32_t n_ta;
bool radio_is_streaming;
srslte_timestamp_t last_rx_time;
float cellsearch_cfo;
static void *phy_thread_fnc(void *arg);
bool decode_mib_N_id_2(int force_N_id_2, srslte_cell_t *cell, uint8_t payload[SRSLTE_BCH_PAYLOAD_LEN]);
int sync_sfn();
void run_rx_tx_state();
bool init_radio_handler(char *args);
ul_buffer* get_ul_buffer_adv(uint32_t tti);
};
}

8
srslte/include/srslte/ue_itf/prach.h
Unescape Escape View File

@ -26,6 +26,7 @@
*/
#include "srslte/srslte.h"
#include "srslte/common/radio.h"
#include "srslte/ue_itf/queue.h"
#include "srslte/ue_itf/params.h"
@ -41,7 +42,8 @@ namespace ue {
void free_cell();
bool prepare_to_send(uint32_t preamble_idx);
bool is_ready_to_send(uint32_t current_tti);
bool send(void *radio_handler, srslte_timestamp_t rx_time);
int get_transmitted_tti();
bool send(srslte::radio* radio_handler, float cfo, srslte_timestamp_t rx_time);
private:
static const uint32_t tx_advance_sf = 1; // Number of subframes to advance transmission
params *params_db = NULL;
@ -50,6 +52,10 @@ namespace ue {
uint32_t len;
cf_t *buffer[64];
srslte_prach_t prach;
uint32_t transmitted_tti;
srslte_cell_t cell;
cf_t *signal_buffer;
srslte_cfo_t cfo_h;
};
}

3
srslte/include/srslte/ue_itf/sched_grant.h
Unescape Escape View File

@ -50,11 +50,14 @@ namespace ue {
bool is_downlink();
void* get_grant_ptr();
uint32_t get_tbs();
uint32_t get_current_tx_nb();
void set_current_tx_nb(uint32_t current_tx_nb);
protected:
union {
srslte_ra_pusch_t ul_grant;
srslte_ra_pdsch_t dl_grant;
};
uint32_t current_tx_nb;
direction_t dir;
uint16_t rnti;
};

2
srslte/include/srslte/ue_itf/ul_buffer.h
Unescape Escape View File

@ -51,7 +51,7 @@ namespace ue {
bool generate_pusch(sched_grant pusch_grant, uint8_t *payload);
bool generate_pusch(sched_grant pusch_grant, uint8_t *payload, srslte_uci_data_t uci_data);
bool generate_pucch(srslte_uci_data_t uci_data);
bool send_packet(radio* radio_handler, float time_adv_sec, srslte_timestamp_t rx_time);
bool send(radio* radio_handler, float time_adv_sec, float cfo, srslte_timestamp_t rx_time);
static const uint32_t tx_advance_sf = 1; // Number of subframes to advance transmission
private:

5
srslte/lib/phch/src/dci.c
Unescape Escape View File

@ -92,10 +92,12 @@ int srslte_dci_msg_to_ra_dl(srslte_dci_msg_t *msg, uint16_t msg_rnti,
ret = SRSLTE_SUCCESS;
} else {
if (SRSLTE_VERBOSE_ISINFO()) {
fprintf(stderr, "Unsupported message type: ");
srslte_dci_msg_type_fprint(stderr, type);
}
}
}
return ret;
}
@ -375,8 +377,9 @@ int dci_format0_unpack(srslte_dci_msg_t *msg, srslte_ra_pusch_t *data, uint32_t
data->ndi = *y++ ? true : false;
// TCP and DM RS commands not implemented
// TPC and DM RS commands not implemented
y += 5;
data->n_dmrs = 0;
// CQI request
data->cqi_request = *y++ ? true : false;

51
srslte/lib/phch/src/phich.c
Unescape Escape View File

@ -53,6 +53,14 @@ uint32_t srslte_phich_ngroups(srslte_phich_t *q) {
return srslte_regs_phich_ngroups(q->regs);
}
uint32_t srslte_phich_nsf(srslte_phich_t *q) {
if (SRSLTE_CP_ISNORM(q->cell.cp)) {
return SRSLTE_PHICH_NORM_NSF;
} else {
return SRSLTE_PHICH_EXT_NSF;
}
}
void srslte_phich_reset(srslte_phich_t *q, cf_t *slot_symbols[SRSLTE_MAX_PORTS]) {
int i;
for (i = 0; i < SRSLTE_MAX_PORTS; i++) {
@ -79,12 +87,13 @@ int srslte_phich_init(srslte_phich_t *q, srslte_regs_t *regs, srslte_cell_t cell
fprintf(stderr, "Error initializing precoding\n");
}
if (srslte_modem_table_lte(&q->mod, SRSLTE_MOD_BPSK, false)) {
if (srslte_modem_table_lte(&q->mod, SRSLTE_MOD_BPSK, true)) {
goto clean;
}
srslte_demod_hard_init(&q->demod);
srslte_demod_hard_table_set(&q->demod, SRSLTE_MOD_BPSK);
srslte_demod_soft_init(&q->demod, SRSLTE_PHICH_MAX_NSYMB);
srslte_demod_soft_table_set(&q->demod, &q->mod);
srslte_demod_soft_alg_set(&q->demod, SRSLTE_DEMOD_SOFT_ALG_APPROX);
for (int nsf = 0; nsf < SRSLTE_NSUBFRAMES_X_FRAME; nsf++) {
if (srslte_sequence_phich(&q->seq[nsf], 2 * nsf, q->cell.id)) {
@ -114,25 +123,29 @@ void srslte_phich_free(srslte_phich_t *q) {
/* Decodes ACK
*
*/
uint8_t srslte_phich_ack_decode(uint8_t bits[SRSLTE_PHICH_NBITS], uint32_t *distance) {
int i, n;
uint8_t srslte_phich_ack_decode(float bits[SRSLTE_PHICH_NBITS], float *distance) {
int i;
float ack_table[2][3] = {{-1.0, -1.0, -1.0}, {1.0, 1.0, 1.0}};
float max_corr = -9999;
uint8_t index=0;
n = 0;
for (i = 0; i < SRSLTE_PHICH_NBITS; i++) {
n += bits[i];
if (SRSLTE_VERBOSE_ISINFO()) {
INFO("Received bits: ", 0);
srslte_vec_fprint_f(stdout, bits, SRSLTE_PHICH_NBITS);
}
INFO("PHICH decoder: %d, %d, %d\n", bits[0], bits[1], bits[2]);
if (n >= 2) {
for (i = 0; i < 2; i++) {
float corr = srslte_vec_dot_prod_fff(ack_table[i], bits, SRSLTE_PHICH_NBITS);
INFO("Corr%d=%f\n", i, corr);
if (corr > max_corr) {
max_corr = corr;
if (distance) {
*distance = 3 - n;
*distance = max_corr;
}
return 1;
} else {
if (distance) {
*distance = n;
index = i;
}
return 0;
}
return index;
}
/** Encodes the ACK
@ -147,7 +160,7 @@ void srslte_phich_ack_encode(uint8_t ack, uint8_t bits[SRSLTE_PHICH_NBITS]) {
* Returns 1 if successfully decoded the CFI, 0 if not and -1 on error
*/
int srslte_phich_decode(srslte_phich_t *q, cf_t *slot_symbols, cf_t *ce[SRSLTE_MAX_PORTS], float noise_estimate,
uint32_t ngroup, uint32_t nseq, uint32_t subframe, uint8_t *ack, uint32_t *distance) {
uint32_t ngroup, uint32_t nseq, uint32_t subframe, uint8_t *ack, float *distance) {
/* Set pointers for layermapping & precoding */
int i, j;
@ -265,10 +278,10 @@ int srslte_phich_decode(srslte_phich_t *q, cf_t *slot_symbols, cf_t *ce[SRSLTE_M
if (SRSLTE_VERBOSE_ISDEBUG())
srslte_vec_fprint_c(stdout, q->z, SRSLTE_PHICH_NBITS);
srslte_demod_hard_demodulate(&q->demod, q->z, q->data, SRSLTE_PHICH_NBITS);
srslte_demod_soft_demodulate(&q->demod, q->z, q->data_rx, SRSLTE_PHICH_NBITS);
if (ack) {
*ack = srslte_phich_ack_decode(q->data, distance);
*ack = srslte_phich_ack_decode(q->data_rx, distance);
}
return SRSLTE_SUCCESS;

7
srslte/lib/phch/src/prach.c
Unescape Escape View File

@ -44,6 +44,7 @@
#define PHI_4 2 // PRACH phi parameter for format 4
#define MAX_ROOTS 838 // Max number of root sequences
#define PRACH_AMP 0.5
/******************************************************
* Reference tables from 3GPP TS 36.211 v10.7.0
@ -357,14 +358,14 @@ int srslte_prach_init(srslte_prach_t *p,
return SRSLTE_ERROR;
}
srslte_dft_plan_set_mirror(p->zc_fft, false);
srslte_dft_plan_set_norm(p->zc_fft, false);
srslte_dft_plan_set_norm(p->zc_fft, true);
p->zc_ifft = (srslte_dft_plan_t*)srslte_vec_malloc(sizeof(srslte_dft_plan_t));
if(srslte_dft_plan(p->zc_ifft, p->N_zc, SRSLTE_DFT_BACKWARD, SRSLTE_DFT_COMPLEX)){
return SRSLTE_ERROR;
}
srslte_dft_plan_set_mirror(p->zc_ifft, false);
srslte_dft_plan_set_norm(p->zc_ifft, false);
srslte_dft_plan_set_norm(p->zc_ifft, true);
// Generate our 64 sequences
p->N_roots = 0;
@ -437,7 +438,7 @@ int srslte_prach_gen(srslte_prach_t *p,
// Copy preamble sequence into buffer
for(int i=0;i<p->N_seq;i++){
signal[p->N_cp+i] = p->ifft_out[i%p->N_ifft_prach];
signal[p->N_cp+i] = PRACH_AMP*p->ifft_out[i%p->N_ifft_prach];
}
ret = SRSLTE_SUCCESS;

2
srslte/lib/phch/test/phich_file_test.c
Unescape Escape View File

@ -214,7 +214,7 @@ void base_free() {
}
int main(int argc, char **argv) {
uint32_t distance;
float distance;
int n;
uint32_t ngroup, nseq, max_nseq;
uint8_t ack_rx;

3
srslte/lib/phch/test/phich_test.c
Unescape Escape View File

@ -108,7 +108,8 @@ int main(int argc, char **argv) {
int nof_re;
cf_t *slot_symbols[SRSLTE_MAX_PORTS];
uint8_t ack[50][SRSLTE_PHICH_NORM_NSEQUENCES], ack_rx;
uint32_t nsf, distance;
uint32_t nsf;
float distance;
int cid, max_cid;
uint32_t ngroup, nseq, max_nseq;

4
srslte/lib/sync/src/sync.c
Unescape Escape View File

@ -144,6 +144,10 @@ float srslte_sync_get_cfo(srslte_sync_t *q) {
return q->mean_cfo;
}
void srslte_sync_set_cfo(srslte_sync_t *q, float cfo) {
q->mean_cfo = cfo;
}
float srslte_sync_get_last_peak_value(srslte_sync_t *q) {
return q->peak_value;
}

4
srslte/lib/ue/src/ue_cell_search.c
Unescape Escape View File

@ -175,6 +175,9 @@ static void get_cell(srslte_ue_cellsearch_t * q, uint32_t nof_detected_frames, s
// PSR is already averaged so take the last value
found_cell->psr = q->candidates[nof_detected_frames-1].psr;
// CFO is also already averaged
found_cell->cfo = q->candidates[nof_detected_frames-1].cfo;
}
/** Finds up to 3 cells, one per each N_id_2=0,1,2 and stores ID and CP in the structure pointed by found_cell.
@ -235,6 +238,7 @@ int srslte_ue_cellsearch_scan_N_id_2(srslte_ue_cellsearch_t * q, uint32_t N_id_2
q->candidates[nof_detected_frames].cp = srslte_sync_get_cp(&q->ue_sync.strack);
q->candidates[nof_detected_frames].peak = q->ue_sync.strack.pss.peak_value;
q->candidates[nof_detected_frames].psr = srslte_sync_get_peak_value(&q->ue_sync.strack);
q->candidates[nof_detected_frames].cfo = srslte_ue_sync_get_cfo(&q->ue_sync);
INFO
("CELL SEARCH: [%3d/%3d/%d]: Found peak PSR=%.3f, Cell_id: %d CP: %s\n",
nof_detected_frames, nof_scanned_frames, q->nof_frames_to_scan,

31
srslte/lib/ue/src/ue_dl.c
Unescape Escape View File

@ -70,6 +70,10 @@ int srslte_ue_dl_init(srslte_ue_dl_t *q,
fprintf(stderr, "Error creating PCFICH object\n");
goto clean_exit;
}
if (srslte_phich_init(&q->phich, &q->regs, q->cell)) {
fprintf(stderr, "Error creating PHICH object\n");
goto clean_exit;
}
if (srslte_pdcch_init(&q->pdcch, &q->regs, q->cell)) {
fprintf(stderr, "Error creating PDCCH object\n");
@ -118,6 +122,7 @@ void srslte_ue_dl_free(srslte_ue_dl_t *q) {
srslte_chest_dl_free(&q->chest);
srslte_regs_free(&q->regs);
srslte_pcfich_free(&q->pcfich);
srslte_phich_free(&q->phich);
srslte_pdcch_free(&q->pdcch);
srslte_pdsch_free(&q->pdsch);
for (uint32_t i=0;i<SRSLTE_UE_UL_NOF_HARQ_PROCESSES; i++) {
@ -312,3 +317,29 @@ int srslte_ue_dl_decode_rnti_rv(srslte_ue_dl_t *q, cf_t *input, uint8_t *data, u
return 0;
}
}
/* Computes n_group and n_seq according to Section 9.1.2 in 36.213 and calls phich processing function */
bool srslte_ue_dl_decode_phich(srslte_ue_dl_t *q, uint32_t sf_idx, uint32_t n_prb_lowest, uint32_t n_dmrs)
{
uint8_t ack_bit;
float distance;
uint32_t Ngroups = srslte_phich_ngroups(&q->phich);
uint32_t ngroup = (n_prb_lowest+n_dmrs)%Ngroups;
uint32_t nseq = ((n_prb_lowest/Ngroups)+n_dmrs)%(2*srslte_phich_nsf(&q->phich));
INFO("Decoding PHICH sf_idx=%d, n_prb_lowest=%d, n_dmrs=%d, n_group=%d, n_seq=%d\n",
sf_idx, n_prb_lowest, n_dmrs, ngroup, nseq);
if (!srslte_phich_decode(&q->phich, q->sf_symbols, q->ce, 0, ngroup, nseq, sf_idx, &ack_bit, &distance)) {
INFO("Decoded PHICH %d with distance %f\n", ack_bit, distance);
} else {
fprintf(stderr, "Error decoding PHICH\n");
return false;
}
if (ack_bit && distance > 5.0) {
return true;
} else {
return false;
}
}

14
srslte/lib/ue/src/ue_sync.c
Unescape Escape View File

@ -221,6 +221,10 @@ float srslte_ue_sync_get_cfo(srslte_ue_sync_t *q) {
return 15000 * srslte_sync_get_cfo(&q->strack);
}
void srslte_ue_sync_set_cfo(srslte_ue_sync_t *q, float cfo) {
srslte_sync_set_cfo(&q->strack, cfo/15000);
}
float srslte_ue_sync_get_sfo(srslte_ue_sync_t *q) {
return 5000*q->mean_time_offset;
}
@ -266,9 +270,6 @@ static int find_peak_ok(srslte_ue_sync_t *q) {
q->frame_find_cnt = 0;
q->mean_time_offset = 0;
/* Set tracking CFO average to find CFO */
q->strack.mean_cfo = q->sfind.mean_cfo;
/* Goto Tracking state */
q->state = SF_TRACK;
}
@ -455,13 +456,6 @@ int srslte_ue_sync_get_buffer(srslte_ue_sync_t *q, cf_t **sf_symbols) {
-srslte_sync_get_cfo(&q->strack) / q->fft_size);
}
/*
if (track_idx > q->fft_size + q->strack.frame_size/2) {
*sf_symbols = &q->input_buffer[track_idx - q->fft_size - q->strack.frame_size/2];
} else {
*sf_symbols = q->input_buffer;
}
*/
*sf_symbols = q->input_buffer;
break;

11
srslte/lib/ue/src/ue_ul.c
Unescape Escape View File

@ -128,6 +128,11 @@ void srslte_ue_ul_set_cfo(srslte_ue_ul_t *q, float cur_cfo) {
q->current_cfo = cur_cfo;
}
void srslte_ue_ul_set_cfo_enable(srslte_ue_ul_t *q, bool enabled)
{
q->cfo_en = enabled;
}
void srslte_ue_ul_set_normalization(srslte_ue_ul_t *q, bool enabled)
{
q->normalize_en = enabled;
@ -194,7 +199,7 @@ int srslte_ue_ul_pusch_uci_encode_rnti(srslte_ue_ul_t *q, srslte_ra_pusch_t *ra_
fprintf(stderr, "Error configuring HARQ process\n");
return ret;
}
printf("sf_idx: %d, rnti: %d\n", sf_idx, rnti);
if (srslte_pusch_encode_rnti(&q->pusch, &q->harq_process[0], data, rnti, q->sf_symbols)) {
fprintf(stderr, "Error encoding TB\n");
return ret;
@ -214,7 +219,9 @@ int srslte_ue_ul_pusch_uci_encode_rnti(srslte_ue_ul_t *q, srslte_ra_pusch_t *ra_
srslte_ofdm_tx_sf(&q->fft, q->sf_symbols, output_signal);
//srslte_cfo_correct(&q->cfo, output_signal, output_signal, q->current_cfo / srslte_symbol_sz(q->cell.nof_prb));
if (q->cfo_en) {
srslte_cfo_correct(&q->cfo, output_signal, output_signal, q->current_cfo / srslte_symbol_sz(q->cell.nof_prb));
}
if (q->normalize_en) {
float norm_factor = (float) q->cell.nof_prb/10/sqrtf(q->harq_process[0].ul_alloc.L_prb);

19
srslte/lib/ue_itf/src/dl_buffer.cc
Unescape Escape View File

@ -65,20 +65,20 @@ void dl_buffer::free_cell()
// FIXME: Avoid this memcpy modifying ue_sync to directly write into provided pointer
bool dl_buffer::recv_ue_sync(srslte_ue_sync_t *ue_sync, srslte_timestamp_t *rx_time)
{
bool ret = false;
if (signal_buffer) {
INFO("DL Buffer TTI %d: Receiving packet\n", tti);
cf_t *sf_buffer = NULL;
if (srslte_ue_sync_get_buffer(ue_sync, &sf_buffer) == 1) {
memcpy(signal_buffer, sf_buffer, sizeof(cf_t) * SRSLTE_SF_LEN_PRB(cell.nof_prb));
srslte_ue_sync_get_last_timestamp(ue_sync, rx_time);
sf_symbols_and_ce_done = false;
pdcch_llr_extracted = false;
if (srslte_ue_sync_get_buffer(ue_sync, &sf_buffer) == 1) {
memcpy(signal_buffer, sf_buffer, sizeof(cf_t) * SRSLTE_SF_LEN_PRB(cell.nof_prb));
ready();
return true;
} else {
return false;
ret = true;
}
srslte_ue_sync_get_last_timestamp(ue_sync, rx_time);
}
return ret;
}
bool dl_buffer::get_ul_grant(pdcch_ul_search_t mode, sched_grant *grant)
@ -154,7 +154,7 @@ bool dl_buffer::get_dl_grant(pdcch_dl_search_t mode, sched_grant *grant)
}
}
bool dl_buffer::decode_phich(srslte_phich_alloc_t assignment)
bool dl_buffer::decode_phich(sched_grant pusch_grant)
{
if (signal_buffer && is_ready()) {
if (!sf_symbols_and_ce_done) {
@ -163,7 +163,10 @@ bool dl_buffer::decode_phich(srslte_phich_alloc_t assignment)
}
sf_symbols_and_ce_done = true;
}
return false;
srslte_ra_pusch_t *ra_ul = (srslte_ra_pusch_t*) pusch_grant.get_grant_ptr();
return srslte_ue_dl_decode_phich(&ue_dl, tti%10, ra_ul->prb_alloc.n_prb[0], ra_ul->n_dmrs);
}
}

56
srslte/lib/ue_itf/src/phy.cc
Unescape Escape View File

@ -53,12 +53,19 @@ bool phy::init(srslte::radio* radio_handler_, srslte::ue::tti_sync* ttisync_)
params_db.set_param(params::CELLSEARCH_TIMEOUT_PSS_CORRELATION_THRESHOLD, 160);
params_db.set_param(params::CELLSEARCH_TIMEOUT_MIB_NFRAMES, 100);
if (!pthread_create(&phy_thread, NULL, phy_thread_fnc, this)) {
pthread_attr_t attr;
struct sched_param param;
param.sched_priority = 99;
pthread_attr_init(&attr);
pthread_attr_setschedpolicy(&attr, SCHED_FIFO);
pthread_attr_setschedparam(&attr, &param);
if (!pthread_create(&phy_thread, &attr, phy_thread_fnc, this)) {
started = true;
} else {
perror("pthread_create");
}
pthread_attr_destroy(&attr);
return started;
}
@ -120,6 +127,11 @@ bool phy::send_prach(uint32_t preamble_idx)
return false;
}
int phy::get_prach_transmitted_tti()
{
return prach_buffer.get_transmitted_tti();
}
// Do fast measurement on RSSI and/or PSS autocorrelation energy or PSR
bool phy::measure()
{
@ -134,11 +146,9 @@ bool phy::start_rxtx()
if (phy_state == IDLE) {
if (cell_is_set) {
// Set RX/TX sampling rate
radio_handler->set_rx_srate(srslte_sampling_freq_hz(cell.nof_prb));
radio_handler->set_tx_srate(srslte_sampling_freq_hz(cell.nof_prb));
radio_handler->set_rx_srate((float) srslte_sampling_freq_hz(cell.nof_prb));
radio_handler->set_tx_srate((float) srslte_sampling_freq_hz(cell.nof_prb));
// Start streaming
radio_handler->start_rx();
phy_state = RXTX;
return true;
} else {
@ -202,6 +212,8 @@ bool phy::set_cell(srslte_cell_t cell_) {
{
if (!srslte_ue_sync_init(&ue_sync, cell, radio_recv_wrapper_cs, radio_handler))
{
srslte_ue_sync_set_cfo(&ue_sync, cellsearch_cfo);
if (prach_buffer.init_cell(cell, &params_db)) {
for(uint32_t i=0;i<6;i++) {
((ul_buffer*) ul_buffer_queue->get(i))->init_cell(cell, &params_db);
@ -226,7 +238,12 @@ bool phy::set_cell(srslte_cell_t cell_) {
ul_buffer* phy::get_ul_buffer(uint32_t tti)
{
return (ul_buffer*) ul_buffer_queue->get(tti - ul_buffer::tx_advance_sf);
return (ul_buffer*) ul_buffer_queue->get(tti);
}
ul_buffer* phy::get_ul_buffer_adv(uint32_t tti)
{
return (ul_buffer*) ul_buffer_queue->get(tti + ul_buffer::tx_advance_sf);
}
dl_buffer* phy::get_dl_buffer(uint32_t tti)
@ -284,8 +301,9 @@ bool phy::decode_mib_N_id_2(int force_N_id_2, srslte_cell_t *cell_ptr, uint8_t b
// Save result
cell_ptr->id = found_cells[max_peak_cell].cell_id;
cell_ptr->cp = found_cells[max_peak_cell].cp;
cellsearch_cfo = found_cells[max_peak_cell].cfo;
INFO("\nFound CELL ID: %d CP: %s\n", cell_ptr->id, srslte_cp_string(cell_ptr->cp));
INFO("\nFound CELL ID: %d CP: %s, CFO: %f\n", cell_ptr->id, srslte_cp_string(cell_ptr->cp), cellsearch_cfo);
srslte_ue_mib_sync_t ue_mib_sync;
@ -351,6 +369,12 @@ void phy::run_rx_tx_state()
{
int ret;
if (!is_sfn_synched) {
if (!radio_is_streaming) {
// Start streaming
radio_handler->start_rx();
radio_is_streaming = true;
}
ret = sync_sfn();
switch(ret) {
default:
@ -364,19 +388,23 @@ void phy::run_rx_tx_state()
}
} else {
uint32_t current_tti = ttisync->get_producer_cntr();
float cfo = srslte_ue_sync_get_cfo(&ue_sync)/15000;
// Receive alligned buffer for the current tti
srslte_timestamp_t rx_time;
get_dl_buffer(current_tti)->recv_ue_sync(&ue_sync, &rx_time);
// Prepare transmission for the next tti
srslte_timestamp_add(&last_rx_time, 0, 1e-3);
// send prach if we have to
if (prach_buffer.is_ready_to_send(current_tti)) {
prach_buffer.send(radio_handler, rx_time);
prach_buffer.send(radio_handler, cfo, last_rx_time);
}
// send ul buffer if we have to
if (get_ul_buffer(current_tti)->is_released()) {
get_ul_buffer(current_tti)->send_packet(radio_handler, time_adv_sec, rx_time);
if (get_ul_buffer_adv(current_tti)->is_released()) {
get_ul_buffer_adv(current_tti)->send(radio_handler, time_adv_sec, cfo, last_rx_time);
}
// Receive alligned buffer for the current tti
get_dl_buffer(current_tti)->recv_ue_sync(&ue_sync, &last_rx_time);
ttisync->increase();
}
}

38
srslte/lib/ue_itf/src/prach.cc
Unescape Escape View File

@ -47,12 +47,17 @@ void prach::free_cell()
free(buffer[i]);
}
}
if (signal_buffer) {
free(signal_buffer);
}
srslte_cfo_free(&cfo_h);
srslte_prach_free(&prach);
}
}
bool prach::init_cell(srslte_cell_t cell, params *params_db_)
bool prach::init_cell(srslte_cell_t cell_, params *params_db_)
{
cell = cell_;
params_db = params_db_;
preamble_idx = -1;
if (srslte_prach_init(&prach, srslte_symbol_sz(cell.nof_prb),
@ -73,14 +78,18 @@ bool prach::init_cell(srslte_cell_t cell, params *params_db_)
return false;
}
}
initiated = true;
return true;
srslte_cfo_init(&cfo_h, len);
signal_buffer = (cf_t*) srslte_vec_malloc(len*sizeof(cf_t));
initiated = signal_buffer?true:false;
transmitted_tti = -1;
return initiated;
}
bool prach::prepare_to_send(uint32_t preamble_idx_)
{
if (initiated && preamble_idx_ < 64) {
preamble_idx = preamble_idx_;
transmitted_tti = -1;
INFO("PRACH Buffer: Prepare to send preamble %d\n", preamble_idx);
return true;
} else {
@ -91,7 +100,7 @@ bool prach::prepare_to_send(uint32_t preamble_idx_)
bool prach::is_ready_to_send(uint32_t current_tti_) {
if (initiated && preamble_idx >= 0 && preamble_idx < 64 && params_db != NULL) {
// consider the number of subframes the transmission must be anticipated
uint32_t current_tti = current_tti_ + tx_advance_sf;
uint32_t current_tti = (current_tti_ + tx_advance_sf)%10240;
// Get SFN and sf_idx from the PRACH configuration index
uint32_t config_idx = (uint32_t) params_db->get_param(params::PRACH_CONFIG_INDEX);
@ -104,7 +113,8 @@ bool prach::is_ready_to_send(uint32_t current_tti_) {
srslte_prach_sf_config(config_idx, &sf_config);
for (int i=0;i<sf_config.nof_sf;i++) {
if ((current_tti%10) == sf_config.sf[i]) {
INFO("PRACH Buffer: Ready to send at tti: %d\n", current_tti);
INFO("PRACH Buffer: Ready to send at tti: %d (now is %d)\n", current_tti, current_tti_);
transmitted_tti = current_tti;
return true;
}
}
@ -114,15 +124,29 @@ bool prach::is_ready_to_send(uint32_t current_tti_) {
return false;
}
bool prach::send(void *radio_handler, srslte_timestamp_t rx_time)
int prach::get_transmitted_tti() {
if (initiated) {
return transmitted_tti;
} else {
return -1;
}
}
bool prach::send(radio *radio_handler, float cfo, srslte_timestamp_t rx_time)
{
// advance transmission time
srslte_timestamp_t tx_time;
srslte_timestamp_copy(&tx_time, &rx_time);
srslte_timestamp_add(&tx_time, 0, 1e-3*tx_advance_sf);
// Correct CFO before transmission
srslte_cfo_correct(&cfo_h, buffer[preamble_idx], signal_buffer, 1.7*cfo / srslte_symbol_sz(cell.nof_prb));
// transmit
cuhd_send_timed(radio_handler, buffer[preamble_idx], len, tx_time.full_secs, tx_time.frac_secs);
radio_handler->tx(signal_buffer, len, tx_time);
INFO("PRACH transmitted CFO: %f, preamble=%d, len=%d rx_time=%f, tx_time=%f\n", cfo*15000, preamble_idx, len, rx_time.frac_secs, tx_time.frac_secs);
//srslte_vec_save_file("prach", buffer[preamble_idx], len*sizeof(cf_t));
preamble_idx = -1;
}
} // namespace ue

11
srslte/lib/ue_itf/src/sched_grant.cc
Unescape Escape View File

@ -62,6 +62,17 @@ namespace ue {
}
}
uint32_t sched_grant::get_current_tx_nb()
{
return current_tx_nb;
}
void sched_grant::set_current_tx_nb(uint32_t current_tx_nb_)
{
current_tx_nb = current_tx_nb_;
}
void sched_grant::set_rv(uint32_t rv) {
if (dir == UPLINK) {
ul_grant.rv_idx = rv;

19
srslte/lib/ue_itf/src/ul_buffer.cc
Unescape Escape View File

@ -38,13 +38,14 @@
namespace srslte {
namespace ue {
bool ul_buffer::init_cell(srslte_cell_t cell_, params *params_db) {
bool ul_buffer::init_cell(srslte_cell_t cell_, params *params_db_) {
cell = cell_;
params_db = params_db;
params_db = params_db_;
current_tx_nb = 0;
if (!srslte_ue_ul_init(&ue_ul, cell)) {
signal_buffer = (cf_t*) srslte_vec_malloc(sizeof(cf_t) * SRSLTE_SF_LEN_PRB(cell.nof_prb));
cell_initiated = signal_buffer?true:false;
srslte_ue_ul_set_cfo_enable(&ue_ul, false);
return cell_initiated;
} else {
return false;
@ -93,13 +94,13 @@ bool ul_buffer::generate_pusch(sched_grant pusch_grant,
pusch_hopping.SRSLTE_PUSCH_HOP_MODE_INTRA_SF :
pusch_hopping.SRSLTE_PUSCH_HOP_MODE_INTER_SF;
pusch_hopping.hopping_offset = params_db->get_param(params::PUSCH_HOPPING_OFFSET);
pusch_hopping.current_tx_nb = current_tx_nb;
pusch_hopping.current_tx_nb = pusch_grant.get_current_tx_nb();
srslte_ue_ul_set_pusch_cfg(&ue_ul, &drms_cfg, &pusch_hopping);
int n = srslte_ue_ul_pusch_uci_encode_rnti(&ue_ul, (srslte_ra_pusch_t*) pusch_grant.get_grant_ptr(),
payload, uci_data,
(tti+tx_advance_sf)%10, pusch_grant.get_rnti(),
tti%10, pusch_grant.get_rnti(),
signal_buffer);
if (n < 0) {
fprintf(stderr, "Error in UL buffer: Error encoding PUSCH\n");
@ -119,18 +120,24 @@ bool ul_buffer::generate_pucch(srslte_uci_data_t uci_data)
return false;
}
bool ul_buffer::send_packet(radio *radio_handler, float time_adv_sec, srslte_timestamp_t rx_time)
bool ul_buffer::send(srslte::radio* radio_handler, float time_adv_sec, float cfo, srslte_timestamp_t rx_time)
{
// send packet through usrp
srslte_timestamp_t tx_time;
srslte_timestamp_copy(&tx_time, &rx_time);
srslte_timestamp_add(&tx_time, 0, tx_advance_sf*1e-3 - time_adv_sec);
INFO("Send PUSCH rx_time= %.6f tx_time = %.6f TA: %.1f us\n",
INFO("Send PUSCH TTI: %d, CFO: %f, len=%d, rx_time= %.6f tx_time = %.6f TA: %.1f us\n",
tti, cfo*15000, SRSLTE_SF_LEN_PRB(cell.nof_prb),
srslte_timestamp_real(&rx_time),
srslte_timestamp_real(&tx_time), time_adv_sec*1000000);
// Correct CFO before transmission
srslte_cfo_correct(&ue_ul.cfo, signal_buffer, signal_buffer, cfo / srslte_symbol_sz(cell.nof_prb));
radio_handler->tx(signal_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb), tx_time);
//srslte_vec_save_file("pusch", signal_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb)*sizeof(cf_t));
ready();
}

117
srslte/lib/ue_itf/test/ue_itf_test_prach.cc
Unescape Escape View File

@ -40,26 +40,31 @@ typedef struct {
float uhd_tx_freq;
float uhd_rx_gain;
float uhd_tx_gain;
bool continous;
}prog_args_t;
prog_args_t prog_args;
void args_default(prog_args_t *args) {
args->uhd_rx_freq = -1.0;
args->uhd_tx_freq = -1.0;
args->uhd_rx_gain = 60.0;
args->uhd_tx_gain = 40.0;
args->continous = false;
}
void usage(prog_args_t *args, char *prog) {
printf("Usage: %s [gGv] -f rx_frequency -F tx_frequency (in Hz)\n", prog);
printf("Usage: %s [gGcv] -f rx_frequency -F tx_frequency (in Hz)\n", prog);
printf("\t-g UHD RX gain [Default %.2f dB]\n", args->uhd_rx_gain);
printf("\t-G UHD TX gain [Default %.2f dB]\n", args->uhd_tx_gain);
printf("\t-c Run continuously [Default only once]\n");
printf("\t-v [increase verbosity, default none]\n");
}
void parse_args(prog_args_t *args, int argc, char **argv) {
int opt;
args_default(args);
while ((opt = getopt(argc, argv, "gGfFv")) != -1) {
while ((opt = getopt(argc, argv, "gGfFcv")) != -1) {
switch (opt) {
case 'g':
args->uhd_rx_gain = atof(argv[optind]);
@ -73,6 +78,9 @@ void parse_args(prog_args_t *args, int argc, char **argv) {
case 'F':
args->uhd_tx_freq = atof(argv[optind]);
break;
case 'c':
args->continous = true;
break;
case 'v':
srslte_verbose++;
break;
@ -182,16 +190,19 @@ int rar_unpack(uint8_t *buffer, rar_msg_t *msg)
srslte::ue::phy phy;
uint8_t payload[1024];
uint8_t payload[102400];
const uint8_t conn_request_msg[] = {0x20, 0x06, 0x1F, 0x5C, 0x2C, 0x04, 0xB2, 0xAC, 0xF6, 0x00, 0x00, 0x00};
enum mac_state {RA, RAR, CONNSETUP} state = RA;
uint32_t ra_tti = 0, conreq_tti = 0;
uint32_t preamble_idx = 0;
uint32_t conreq_tti = 0;
uint32_t preamble_idx = 7;
rar_msg_t rar_msg;
uint32_t nof_rx_connsetup = 0, nof_rx_rar = 0, nof_tx_ra = 0;
uint32_t nof_rtx_connsetup = 0;
uint32_t rv_value[4] = {0, 2, 3, 1};
void config_phy() {
phy.set_param(srslte::ue::params::PRACH_CONFIG_INDEX, 0);
phy.set_param(srslte::ue::params::PRACH_FREQ_OFFSET, 0);
@ -207,6 +218,14 @@ void config_phy() {
}
uint32_t interval(uint32_t x1, uint32_t x2) {
if (x1 > x2) {
return x1-x2;
} else {
return 10240-x2+x1;
}
}
// This is the MAC implementation
void run_tti(uint32_t tti) {
INFO("MAC running tti: %d\n", tti);
@ -214,15 +233,12 @@ void run_tti(uint32_t tti) {
// Get buffer
srslte::ue::dl_buffer *dl_buffer = phy.get_dl_buffer(tti);
if (dl_buffer) {
fprintf(stderr, "Error getting DL buffer for tti %d\n", tti);
return;
}
if (state == RA) {
if (nof_tx_ra > 0 && !prog_args.continous) {
exit(0);
}
// Indicate PHY to transmit the PRACH when possible
if (phy.send_prach(preamble_idx)) {
ra_tti = tti;
nof_tx_ra++;
state = RAR;
} else {
@ -231,9 +247,13 @@ void run_tti(uint32_t tti) {
}
} else if (state == RAR) {
srslte::ue::sched_grant rar_grant(srslte::ue::sched_grant::DOWNLINK, 2);
int ra_tti = phy.get_prach_transmitted_tti();
if (ra_tti > 0) {
INFO("PRACH was transmitted at %d\n", ra_tti);
// Assume the maximum RA-window
uint32_t interval = (tti-ra_tti)%10240;
if (interval >= 3 && interval <= 13) {
uint32_t interval_ra = interval(tti, ra_tti);
INFO("Interval=%u\n", interval_ra);
if (interval_ra >= 3 && interval_ra <= 13) {
// Get DL grant for RA-RNTI=2
if (dl_buffer->get_dl_grant(srslte::ue::dl_buffer::PDCCH_DL_SEARCH_RARNTI, &rar_grant))
{
@ -245,6 +265,7 @@ void run_tti(uint32_t tti) {
INFO("Received RAR for preamble %d\n", rar_msg.RAPID);
if (rar_msg.RAPID == preamble_idx) {
INFO("Received RAR at TTI: %d\n", tti);
nof_rx_rar++;
if (SRSLTE_VERBOSE_ISINFO()) {
@ -266,10 +287,12 @@ void run_tti(uint32_t tti) {
// Generate PUSCH
if (ul_buffer) {
ul_buffer->generate_pusch(connreq_grant, payload);
connreq_grant.set_rv(0);
INFO("Generating PUSCH for TTI: %d\n", ul_buffer->tti);
//ul_buffer->generate_pusch(connreq_grant, payload);
// Save transmission time
conreq_tti = tti;
conreq_tti = ul_buffer->tti;
state = CONNSETUP;
} else {
fprintf(stderr, "Error getting UL buffer for TTI %d\n", tti);
@ -278,37 +301,85 @@ void run_tti(uint32_t tti) {
}
}
}
} else if (interval_ra > 13 && interval_ra < 100) { // avoid wrapping
INFO("RAR not received at TTI=%d (interval_ra=%d)\n", tti, interval_ra);
state = RA;
}
}
} else {
srslte::ue::sched_grant conn_setup_grant(srslte::ue::sched_grant::DOWNLINK, rar_msg.temp_c_rnti);
if ((tti - conreq_tti)%10240 == 4) {
// Get DL grant for RA-RNTI=2
uint32_t interval_conreq = interval(tti, conreq_tti);
if (interval_conreq == 4) {
srslte::ue::sched_grant connreq_grant(srslte::ue::sched_grant::UPLINK, rar_msg.temp_c_rnti);
phy.rar_ul_grant(rar_msg.rba, rar_msg.mcs, rar_msg.hopping_flag, &connreq_grant);
// Decode PHICH from Connection Request
if (!dl_buffer->decode_phich(connreq_grant)) {
// Pack Msg3 bits
srslte_bit_pack_vector((uint8_t*) conn_request_msg, payload, connreq_grant.get_tbs());
// Get UL buffer
srslte::ue::ul_buffer *ul_buffer = phy.get_ul_buffer(tti+4);
// Generate PUSCH
if (ul_buffer) {
nof_rtx_connsetup++;
if (nof_rtx_connsetup >= 5) {
state = RA;
} else {
connreq_grant.set_current_tx_nb(nof_rtx_connsetup);
connreq_grant.set_rv(rv_value[nof_rtx_connsetup%4]);
INFO("Generating PUSCH for TTI: %d\n", ul_buffer->tti);
ul_buffer->generate_pusch(connreq_grant, payload);
// Save transmission time
conreq_tti = ul_buffer->tti;
state = CONNSETUP;
}
} else {
fprintf(stderr, "Error getting UL buffer for TTI %d\n", tti);
state = RA;
}
} else {
// Get DL grant for tmp_rnti
if (dl_buffer->get_dl_grant(srslte::ue::dl_buffer::PDCCH_DL_SEARCH_TEMPORAL, &conn_setup_grant))
{
// Decode packet
if (dl_buffer->decode_pdsch(conn_setup_grant, payload)) {
INFO("ConnSetup received tti=%d\n", tti);
nof_rx_connsetup++;
state = RA;
nof_rtx_connsetup=0;
if (!prog_args.continous) {
printf("Connection Setup received (%d/%d)\n", nof_rx_connsetup, nof_tx_ra);
}
} else {
INFO("Error decoding PDSCH for Connection Request at TTI=%d\n", tti);
state = RA;
}
} else {
INFO("DCI for Connection Request not found on PDCCH at TTI=%d\n", tti);
state = RA;
}
}
}
}
if (srslte_verbose == SRSLTE_VERBOSE_NONE) {
printf("RECV RAR %.1f \%% RECV ConnSetup %.1f \%% (total RA: %5u) \r",
if (srslte_verbose == SRSLTE_VERBOSE_NONE && prog_args.continous) {
printf("RECV RAR %2.1f \%% RECV ConnSetup %2.1f \%% (%5u/%5u) \r",
(float) 100*nof_rx_rar/nof_tx_ra,
(float) 100*nof_rx_connsetup/nof_tx_ra,
nof_tx_ra);
nof_rx_connsetup, nof_tx_ra);
}
dl_buffer->ready();
}
int main(int argc, char *argv[])
{
srslte_cell_t cell;
uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];
prog_args_t prog_args;
srslte::ue::tti_sync_cv ttisync(10240);
srslte::radio_uhd radio_uhd;

Write Preview
Loading…
Cancel
Save