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srsRAN_4G
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Merge branch 'next' into embms_merge_final

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master
Andre Puschmann 7 years ago
parent 7c56a7d083 8beb3cab10
commit 61d525ea80
19 changed files with 200 additions and 147 deletions
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22
lib/include/srslte/common/block_queue.h
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@ -49,11 +49,23 @@ template<typename myobj>
class block_queue {
public:
// Callback functions for mutexed operations inside pop/push methods
class call_mutexed_itf {
public:
virtual void popping(myobj obj) = 0;
virtual void pushing(myobj obj) = 0;
};
block_queue<myobj>(int capacity = -1) {
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&cv_empty, NULL);
pthread_cond_init(&cv_full, NULL);
this->capacity = capacity;
mutexed_callback = NULL;
}
void set_mutexed_itf(call_mutexed_itf *itf) {
mutexed_callback = itf;
}
void resize(int new_capacity) {
capacity = new_capacity;
@ -71,6 +83,9 @@ public:
}
}
q.push(value);
if (mutexed_callback) {
mutexed_callback->pushing(value);
}
pthread_cond_signal(&cv_empty);
pthread_mutex_unlock(&mutex);
return true;
@ -94,6 +109,9 @@ public:
*value = q.front();
q.pop();
}
if (mutexed_callback) {
mutexed_callback->popping(*value);
}
pthread_cond_signal(&cv_full);
pthread_mutex_unlock(&mutex);
return true;
@ -106,6 +124,9 @@ public:
}
myobj value = q.front();
q.pop();
if (mutexed_callback) {
mutexed_callback->popping(value);
}
pthread_cond_signal(&cv_full);
pthread_mutex_unlock(&mutex);
return value;
@ -136,6 +157,7 @@ private:
pthread_mutex_t mutex;
pthread_cond_t cv_empty;
pthread_cond_t cv_full;
call_mutexed_itf *mutexed_callback;
int capacity;
};

2
lib/include/srslte/interfaces/ue_interfaces.h
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@ -529,6 +529,8 @@ typedef struct {
float cfo_loop_bw_ref;
float cfo_loop_ref_min;
float cfo_loop_pss_tol;
float sfo_ema;
uint32_t sfo_correct_period;
uint32_t cfo_loop_pss_conv;
uint32_t cfo_ref_mask;
bool average_subframe_enabled;

12
lib/include/srslte/phy/ue/ue_sync.h
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@ -61,6 +61,8 @@
#include "srslte/phy/common/timestamp.h"
#include "srslte/phy/io/filesource.h"
#define DEFAULT_SAMPLE_OFFSET_CORRECT_PERIOD 10
#define DEFAULT_SFO_EMA_COEFF 0.1
#define DEFAULT_CFO_BW_PSS 0.05
#define DEFAULT_CFO_PSS_MIN 400 // typical bias of PSS estimation.
@ -140,8 +142,7 @@ typedef struct SRSLTE_API {
int next_rf_sample_offset;
int last_sample_offset;
float mean_sample_offset;
float mean_sfo;
uint32_t sample_offset_correct_period;
uint32_t sample_offset_correct_period;
float sfo_ema;
@ -248,8 +249,11 @@ SRSLTE_API float srslte_ue_sync_get_sfo(srslte_ue_sync_t *q);
SRSLTE_API int srslte_ue_sync_get_last_sample_offset(srslte_ue_sync_t *q);
SRSLTE_API void srslte_ue_sync_set_sample_offset_correct_period(srslte_ue_sync_t *q,
uint32_t nof_subframes);
SRSLTE_API void srslte_ue_sync_set_sfo_correct_period(srslte_ue_sync_t *q,
uint32_t nof_subframes);
SRSLTE_API void srslte_ue_sync_set_sfo_ema(srslte_ue_sync_t *q,
float ema_coefficient);
SRSLTE_API void srslte_ue_sync_get_last_timestamp(srslte_ue_sync_t *q,
srslte_timestamp_t *timestamp);

36
lib/include/srslte/upper/rlc_tx_queue.h
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@ -41,42 +41,38 @@
namespace srslte {
class rlc_tx_queue
class rlc_tx_queue : public block_queue<byte_buffer_t*>::call_mutexed_itf
{
public:
rlc_tx_queue(uint32_t capacity = 128) : queue((int) capacity) {
unread_bytes = 0;
queue.set_mutexed_itf(this);
}
// increase/decrease unread_bytes inside push/pop mutexed operations
void pushing(byte_buffer_t *msg) {
unread_bytes += msg->N_bytes;
}
void popping(byte_buffer_t *msg) {
if (unread_bytes > msg->N_bytes) {
unread_bytes -= msg->N_bytes;
} else {
unread_bytes = 0;
}
}
void write(byte_buffer_t *msg)
{
queue.push(msg);
unread_bytes += msg->N_bytes;
}
void read(byte_buffer_t **msg)
{
byte_buffer_t *m = queue.wait_pop();
*msg = m;
if (unread_bytes > (*msg)->N_bytes) {
unread_bytes -= (*msg)->N_bytes;
} else {
unread_bytes = 0;
}
}
bool try_read(byte_buffer_t **msg)
{
if (queue.try_pop(msg)) {
if (unread_bytes > (*msg)->N_bytes) {
unread_bytes -= (*msg)->N_bytes;
} else {
unread_bytes = 0;
}
return true;
} else {
return false;
}
return queue.try_pop(msg);
}
void resize(uint32_t capacity)
@ -110,10 +106,10 @@ public:
}
private:
bool is_empty() { return queue.empty(); }
bool is_empty() { return queue.empty(); }
block_queue<byte_buffer_t*> queue;
uint32_t unread_bytes;
uint32_t unread_bytes;
};
} // namespace srslte

30
lib/src/phy/rf/rf_uhd_imp.c
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@ -60,7 +60,9 @@ typedef struct {
float current_master_clock;
bool async_thread_running;
pthread_t async_thread;
pthread_t async_thread;
pthread_mutex_t tx_mutex;
} rf_uhd_handler_t;
void suppress_handler(const char *x)
@ -374,6 +376,8 @@ int rf_uhd_open_multi(char *args, void **h, uint32_t nof_channels)
}
handler->devname = NULL;
pthread_mutex_init(&handler->tx_mutex, NULL);
// Initialize handler
handler->uhd_error_handler = NULL;
@ -819,9 +823,13 @@ int rf_uhd_send_timed_multi(void *h,
bool has_time_spec,
bool blocking,
bool is_start_of_burst,
bool is_end_of_burst) {
bool is_end_of_burst)
{
rf_uhd_handler_t* handler = (rf_uhd_handler_t*) h;
pthread_mutex_lock(&handler->tx_mutex);
int ret = -1;
/* Resets the USRP time FIXME: this might cause problems for burst transmissions */
if (!has_time_spec && is_start_of_burst && handler->nof_tx_channels > 1) {
uhd_usrp_set_time_now(handler->usrp, 0, 0, 0);
@ -866,15 +874,18 @@ int rf_uhd_send_timed_multi(void *h,
tx_samples, &handler->tx_md, 3.0, &txd_samples);
if (error) {
fprintf(stderr, "Error sending to UHD: %d\n", error);
return -1;
goto unlock;
}
// Increase time spec
uhd_tx_metadata_add_time_spec(&handler->tx_md, txd_samples/handler->tx_rate);
n += txd_samples;
trials++;
} while (n < nsamples && trials < 100);
return nsamples;
ret = nsamples;
} else {
const void *buffs_ptr[4];
for (int i = 0; i < 4; i++) {
buffs_ptr[i] = data[i];
@ -885,9 +896,14 @@ int rf_uhd_send_timed_multi(void *h,
uhd_error error = uhd_tx_streamer_send(handler->tx_stream, buffs_ptr, nsamples, &handler->tx_md, 3.0, &txd_samples);
if (error) {
fprintf(stderr, "Error sending to UHD: %d\n", error);
return -1;
goto unlock;
}
return txd_samples;
ret = txd_samples;
}
unlock:
pthread_mutex_unlock(&handler->tx_mutex);
return ret;
}

27
lib/src/phy/ue/ue_sync.c
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@ -41,11 +41,9 @@
#define MAX_TIME_OFFSET 128
#define TRACK_MAX_LOST 100
#define TRACK_MAX_LOST 10
#define TRACK_FRAME_SIZE 32
#define FIND_NOF_AVG_FRAMES 4
#define DEFAULT_SAMPLE_OFFSET_CORRECT_PERIOD 0
#define DEFAULT_SFO_EMA_COEFF 0.1
cf_t dummy_buffer0[15*2048/2];
@ -386,7 +384,7 @@ int srslte_ue_sync_set_cell(srslte_ue_sync_t *q, srslte_cell_t cell)
srslte_sync_set_em_alpha(&q->sfind, 1);
srslte_sync_set_threshold(&q->sfind, 3.0);
srslte_sync_set_em_alpha(&q->strack, 0.2);
srslte_sync_set_em_alpha(&q->strack, 0.0);
srslte_sync_set_threshold(&q->strack, 1.2);
}
@ -464,14 +462,14 @@ void srslte_ue_sync_set_cfo_tol(srslte_ue_sync_t *q, float cfo_tol) {
}
float srslte_ue_sync_get_sfo(srslte_ue_sync_t *q) {
return q->mean_sfo/5e-3;
return q->mean_sample_offset/5e-3;
}
int srslte_ue_sync_get_last_sample_offset(srslte_ue_sync_t *q) {
return q->last_sample_offset;
}
void srslte_ue_sync_set_sample_offset_correct_period(srslte_ue_sync_t *q, uint32_t nof_subframes) {
void srslte_ue_sync_set_sfo_correct_period(srslte_ue_sync_t *q, uint32_t nof_subframes) {
q->sample_offset_correct_period = nof_subframes;
}
@ -563,7 +561,7 @@ static int track_peak_ok(srslte_ue_sync_t *q, uint32_t track_idx) {
uint32_t frame_idx = 0;
if (q->sample_offset_correct_period) {
frame_idx = q->frame_ok_cnt%q->sample_offset_correct_period;
q->mean_sample_offset += (float) q->last_sample_offset/q->sample_offset_correct_period;
q->mean_sample_offset = SRSLTE_VEC_EMA((float) q->last_sample_offset, q->mean_sample_offset, q->sfo_ema);
} else {
q->mean_sample_offset = q->last_sample_offset;
}
@ -589,23 +587,12 @@ static int track_peak_ok(srslte_ue_sync_t *q, uint32_t track_idx) {
if (!frame_idx) {
// Adjust RF sampling time based on the mean sampling offset
q->next_rf_sample_offset = (int) round(q->mean_sample_offset);
// Reset PSS averaging if correcting every a period longer than 1
if (q->sample_offset_correct_period > 1) {
srslte_sync_reset(&q->strack);
}
// Compute SFO based on mean sample offset
if (q->sample_offset_correct_period) {
q->mean_sample_offset /= q->sample_offset_correct_period;
}
q->mean_sfo = SRSLTE_VEC_EMA(q->mean_sample_offset, q->mean_sfo, q->sfo_ema);
if (q->next_rf_sample_offset) {
INFO("Time offset adjustment: %d samples (%.2f), mean SFO: %.2f Hz, %.5f samples/5-sf, ema=%f, length=%d\n",
INFO("Time offset adjustment: %d samples (%.2f), mean SFO: %.2f Hz, ema=%f, length=%d\n",
q->next_rf_sample_offset, q->mean_sample_offset,
srslte_ue_sync_get_sfo(q),
q->mean_sfo, q->sfo_ema, q->sample_offset_correct_period);
q->sfo_ema, q->sample_offset_correct_period);
}
q->mean_sample_offset = 0;
}

9
lib/src/upper/rlc_um.cc
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@ -577,9 +577,16 @@ void rlc_um::reassemble_rx_sdus()
break;
}
// Check available space in SDU
if ((uint32_t)len > rx_sdu->get_tailroom()) {
log->error("Dropping PDU %d due to buffer mis-alignment (current segment len %d B, received %d B)\n", vr_ur, rx_sdu->N_bytes, len);
rx_sdu->reset();
goto clean_up_rx_window;
}
log->debug("Concatenating %d bytes in to current length %d. rx_window remaining bytes=%d, vr_ur_in_rx_sdu=%d, vr_ur=%d, rx_mod=%d, last_mod=%d\n",
len, rx_sdu->N_bytes, rx_window[vr_ur].buf->N_bytes, vr_ur_in_rx_sdu, vr_ur, cfg.rx_mod, (vr_ur_in_rx_sdu+1)%cfg.rx_mod);
memmove(&rx_sdu->msg[rx_sdu->N_bytes], rx_window[vr_ur].buf->msg, len);
memcpy(&rx_sdu->msg[rx_sdu->N_bytes], rx_window[vr_ur].buf->msg, len);
rx_sdu->N_bytes += len;
rx_window[vr_ur].buf->msg += len;
rx_window[vr_ur].buf->N_bytes -= len;

6
lib/test/upper/rlc_stress_test.cc
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@ -279,8 +279,10 @@ private:
while(run_enable) {
byte_buffer_t *pdu = byte_buffer_pool::get_instance()->allocate("rlc_tester::run_thread");
if (!pdu) {
printf("Fatal Error: Could not allocate PDU in rlc_tester::run_thread\n");
exit(-1);
printf("Error: Could not allocate PDU in rlc_tester::run_thread\n\n\n");
// backoff for a bit
usleep(1000);
continue;
}
for (uint32_t i = 0; i < SDU_SIZE; i++) {
pdu->msg[i] = sn;

10
srsenb/hdr/mac/scheduler_metric.h
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@ -34,7 +34,7 @@ namespace srsenb {
class dl_metric_rr : public sched::metric_dl
{
public:
void new_tti(std::map<uint16_t,sched_ue> &ue_db, uint32_t start_rb, uint32_t nof_rb, uint32_t nof_ctrl_symbols, uint32_t tti);
void new_tti(std::map<uint16_t,sched_ue> &ue_db, uint32_t start_rbg, uint32_t nof_rbg, uint32_t nof_ctrl_symbols, uint32_t tti);
dl_harq_proc* get_user_allocation(sched_ue *user);
private:
@ -49,14 +49,14 @@ private:
uint32_t count_rbg(uint32_t mask);
uint32_t calc_rbg_mask(bool mask[25]);
bool used_rb[MAX_RBG];
bool used_rbg[MAX_RBG];
uint32_t current_tti;
uint32_t total_rb;
uint32_t used_rb_mask;
uint32_t total_rbg;
uint32_t used_rbg_mask;
uint32_t nof_ctrl_symbols;
uint32_t available_rb;
uint32_t available_rbg;
};
class ul_metric_rr : public sched::metric_ul

18
srsenb/hdr/mac/scheduler_ue.h
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@ -93,11 +93,15 @@ public:
* Functions used by scheduler metric objects
*******************************************************/
uint32_t get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_symbols);
uint32_t get_required_prb_ul(uint32_t req_bytes);
uint32_t get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_symbols);
uint32_t get_required_prb_ul(uint32_t req_bytes);
uint32_t prb_to_rbg(uint32_t nof_prb);
uint32_t rgb_to_prb(uint32_t nof_rbg);
uint32_t get_pending_dl_new_data(uint32_t tti);
uint32_t get_pending_ul_new_data(uint32_t tti);
uint32_t get_pending_dl_new_data_total(uint32_t tti);
dl_harq_proc *get_pending_dl_harq(uint32_t tti);
dl_harq_proc *get_empty_dl_harq();
@ -147,11 +151,10 @@ private:
static bool bearer_is_ul(ue_bearer_t *lch);
static bool bearer_is_dl(ue_bearer_t *lch);
bool is_first_dl_tx();
sched_interface::ue_cfg_t cfg;
sched_interface::ue_cfg_t cfg;
srslte_cell_t cell;
srslte::log* log_h;
@ -175,7 +178,8 @@ private:
uint32_t max_mcs_dl;
uint32_t max_mcs_ul;
int fixed_mcs_ul;
int fixed_mcs_dl;
int fixed_mcs_dl;
uint32_t P;
int next_tpc_pusch;
int next_tpc_pucch;

6
srsenb/src/mac/scheduler.cc
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@ -610,7 +610,7 @@ int sched::dl_sched_rar(dl_sched_rar_t rar[MAX_RAR_LIST])
int nof_rar_elems = 0;
for (uint32_t i=0;i<SCHED_MAX_PENDING_RAR;i++)
{
if (pending_rar[i].buf_rar > 0 && avail_rbg >= rar_n_rb)
if (pending_rar[i].buf_rar > 0 && avail_rbg >= (uint32_t)ceil((float)rar_n_rb/P))
{
/* Check if we are still within the RAR window, otherwise discard it */
if (current_tti <= (pending_rar[i].rar_tti + cfg.prach_rar_window + 3)%10240 && current_tti >= pending_rar[i].rar_tti + 3)
@ -664,8 +664,8 @@ int sched::dl_sched_rar(dl_sched_rar_t rar[MAX_RAR_LIST])
if (generate_format1a(start_rbg*P, rar_n_rb, buf_rar, 0, &rar[nof_rar_elems].dci) >= 0) {
rar[nof_rar_elems].tbs = buf_rar;
nof_rar_elems++;
avail_rbg -= rar_n_rb;
start_rbg += rar_n_rb;
avail_rbg -= (uint32_t)ceil((float)rar_n_rb/P);
start_rbg += (uint32_t)ceil((float)rar_n_rb/P);
} else {
Error("SCHED: Allocating Format1A grant\n");
}

48
srsenb/src/mac/scheduler_metric.cc
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@ -47,9 +47,9 @@ uint32_t dl_metric_rr::calc_rbg_mask(bool mask[MAX_RBG])
{
// Build RBG bitmask
uint32_t rbg_bitmask = 0;
for (uint32_t n=0;n<total_rb;n++) {
for (uint32_t n=0;n<total_rbg;n++) {
if (mask[n]) {
rbg_bitmask |= (1<<(total_rb-1-n));
rbg_bitmask |= (1<<(total_rbg-1-n));
}
}
return rbg_bitmask;
@ -73,21 +73,21 @@ uint32_t dl_metric_rr::get_required_rbg(sched_ue *user, uint32_t tti)
return count_rbg(h->get_rbgmask());
}
uint32_t pending_data = user->get_pending_dl_new_data(current_tti);
return user->get_required_prb_dl(pending_data, nof_ctrl_symbols);
return user->prb_to_rbg(user->get_required_prb_dl(pending_data, nof_ctrl_symbols));
}
void dl_metric_rr::new_tti(std::map<uint16_t,sched_ue> &ue_db, uint32_t start_rb, uint32_t nof_rb, uint32_t nof_ctrl_symbols_, uint32_t tti)
void dl_metric_rr::new_tti(std::map<uint16_t,sched_ue> &ue_db, uint32_t start_rbg, uint32_t nof_rbg, uint32_t nof_ctrl_symbols_, uint32_t tti)
{
total_rb = start_rb+nof_rb;
for (uint32_t i=0;i<total_rb;i++) {
if (i<start_rb) {
used_rb[i] = true;
total_rbg = start_rbg+nof_rbg;
for (uint32_t i=0;i<total_rbg;i++) {
if (i<start_rbg) {
used_rbg[i] = true;
} else {
used_rb[i] = false;
used_rbg[i] = false;
}
}
available_rb = nof_rb;
used_rb_mask = calc_rbg_mask(used_rb);
available_rbg = nof_rbg;
used_rbg_mask = calc_rbg_mask(used_rbg);
current_tti = tti;
nof_ctrl_symbols = nof_ctrl_symbols_;
@ -111,8 +111,8 @@ bool dl_metric_rr::new_allocation(uint32_t nof_rbg, uint32_t *rbgmask) {
bool mask_bit[MAX_RBG];
bzero(mask_bit, sizeof(bool)*MAX_RBG);
for (uint32_t i=0;i<total_rb && nof_rbg > 0;i++) {
if (used_rb[i]) {
for (uint32_t i=0;i<total_rbg && nof_rbg > 0;i++) {
if (used_rbg[i]) {
mask_bit[i] = false;
} else {
mask_bit[i] = true;
@ -126,24 +126,24 @@ bool dl_metric_rr::new_allocation(uint32_t nof_rbg, uint32_t *rbgmask) {
}
void dl_metric_rr::update_allocation(uint32_t new_mask) {
used_rb_mask |= new_mask;
for (uint32_t n=0;n<total_rb;n++) {
if (used_rb_mask & (1<<(total_rb-1-n))) {
used_rb[n] = true;
used_rbg_mask |= new_mask;
for (uint32_t n=0;n<total_rbg;n++) {
if (used_rbg_mask & (1<<(total_rbg-1-n))) {
used_rbg[n] = true;
} else {
used_rb[n] = false;
used_rbg[n] = false;
}
}
}
bool dl_metric_rr::allocation_is_valid(uint32_t mask)
{
return (mask & used_rb_mask);
return (mask & used_rbg_mask);
}
dl_harq_proc* dl_metric_rr::apply_user_allocation(sched_ue *user) {
uint32_t pending_data = user->get_pending_dl_new_data(current_tti);
dl_harq_proc *h = user->get_pending_dl_harq(current_tti);
uint32_t req_bytes = user->get_pending_dl_new_data_total(current_tti);
// Schedule retx if we have space
#if ASYNC_DL_SCHED
@ -160,7 +160,7 @@ dl_harq_proc* dl_metric_rr::apply_user_allocation(sched_ue *user) {
// If not, try to find another mask in the current tti
uint32_t nof_rbg = count_rbg(retx_mask);
if (nof_rbg < available_rb) {
if (nof_rbg < available_rbg) {
if (new_allocation(nof_rbg, &retx_mask)) {
update_allocation(retx_mask);
h->set_rbgmask(retx_mask);
@ -176,10 +176,10 @@ dl_harq_proc* dl_metric_rr::apply_user_allocation(sched_ue *user) {
if (h && h->is_empty()) {
#endif
// Allocate resources based on pending data
if (pending_data) {
uint32_t pending_rb = user->get_required_prb_dl(pending_data, nof_ctrl_symbols);
if (req_bytes) {
uint32_t pending_rbg = user->prb_to_rbg(user->get_required_prb_dl(req_bytes, nof_ctrl_symbols));
uint32_t newtx_mask = 0;
new_allocation(pending_rb, &newtx_mask);
new_allocation(pending_rbg, &newtx_mask);
if (newtx_mask) {
update_allocation(newtx_mask);
h->set_rbgmask(newtx_mask);

60
srsenb/src/mac/scheduler_ue.cc
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@ -71,6 +71,7 @@ void sched_ue::set_cfg(uint16_t rnti_, sched_interface::ue_cfg_t *cfg_, sched_in
rnti = rnti_;
log_h = log_h_;
memcpy(&cell, &cell_cfg->cell, sizeof(srslte_cell_t));
P = srslte_ra_type0_P(cell.nof_prb);
max_mcs_dl = 28;
max_mcs_ul = 28;
@ -710,6 +711,22 @@ uint32_t sched_ue::get_pending_dl_new_data(uint32_t tti)
return pending_data;
}
/// Use this function in the dl-metric to get the bytes to be scheduled. It accounts for the UE data,
/// the RAR resources, and headers
/// \param tti
/// \return number of bytes to be allocated
uint32_t sched_ue::get_pending_dl_new_data_total(uint32_t tti)
{
uint32_t req_bytes = get_pending_dl_new_data(tti);
if(req_bytes>0) {
req_bytes += (req_bytes < 128) ? 2 : 3; // consider the header
if(is_first_dl_tx()) {
req_bytes += 6; // count for RAR
}
}
return req_bytes;
}
uint32_t sched_ue::get_pending_ul_new_data(uint32_t tti)
{
uint32_t pending_data = 0;
@ -746,32 +763,39 @@ uint32_t sched_ue::get_pending_ul_old_data()
return pending_data;
}
uint32_t sched_ue::prb_to_rbg(uint32_t nof_prb)
{
return (uint32_t) ceil((float) nof_prb / P);
}
uint32_t sched_ue::get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_symbols)
uint32_t sched_ue::rgb_to_prb(uint32_t nof_rbg)
{
int mcs = 0;
uint32_t nbytes = 0;
uint32_t n = 0;
if (req_bytes == 0) {
return 0;
}
uint32_t nof_re = 0;
int tbs = 0;
for (n=1;n<=cell.nof_prb && nbytes < req_bytes;n++) {
nof_re = srslte_ra_dl_approx_nof_re(cell, n, nof_ctrl_symbols);
if (fixed_mcs_dl < 0) {
tbs = alloc_tbs_dl(n, nof_re, 0, &mcs);
return P*nof_rbg;
}
uint32_t sched_ue::get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_symbols)
{
int mcs = 0;
uint32_t nof_re = 0;
int tbs = 0;
uint32_t nbytes = 0;
uint32_t n;
for (n=0; n < cell.nof_prb && nbytes < req_bytes; ++n) {
nof_re = srslte_ra_dl_approx_nof_re(cell, n+1, nof_ctrl_symbols);
if(fixed_mcs_dl < 0) {
tbs = alloc_tbs_dl(n+1, nof_re, 0, &mcs);
} else {
tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_dl), n)/8;
tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_dl), n+1)/8;
}
if (tbs > 0) {
nbytes = tbs;
nbytes = tbs;
} else if (tbs < 0) {
return 0;
return 0;
}
}
return n;
return n;
}
uint32_t sched_ue::get_required_prb_ul(uint32_t req_bytes)

10
srsue/hdr/phy/phch_common.h
Unescape Escape View File

@ -96,8 +96,8 @@ typedef struct {
float avg_rssi_dbm;
float last_radio_rssi;
float rx_gain_offset;
float avg_snr_db_cqi;
float avg_snr_db_sync;
float avg_snr_db_cqi;
float avg_snr_db_sync;
float avg_noise;
bool pcell_meas_enabled;
@ -232,11 +232,7 @@ typedef struct {
bool is_mch_subframe(subframe_cfg_t *cfg, uint32_t phy_tti);
bool is_mcch_subframe(subframe_cfg_t *cfg, uint32_t phy_tti);
};
};
} // namespace srsue
#endif // SRSUE_PDCH_COMMON_H

8
srsue/src/main.cc
Unescape Escape View File

@ -191,6 +191,14 @@ void parse_args(all_args_t *args, int argc, char *argv[]) {
bpo::value<int>(&args->expert.phy.cqi_fixed)->default_value(-1),
"Fixes the reported CQI to a constant value. Default disabled.")
("expert.sfo_correct_period",
bpo::value<uint32_t>(&args->expert.phy.sfo_correct_period)->default_value(DEFAULT_SAMPLE_OFFSET_CORRECT_PERIOD),
"Period in ms to correct sample time")
("expert.sfo_emma",
bpo::value<float>(&args->expert.phy.sfo_ema)->default_value(DEFAULT_SFO_EMA_COEFF),
"EMA coefficient to average sample offsets used to compute SFO")
("expert.snr_ema_coeff",
bpo::value<float>(&args->expert.phy.snr_ema_coeff)->default_value(0.1),
"Sets the SNR exponential moving average coefficient (Default 0.1)")

2
srsue/src/phy/phch_common.cc
Unescape Escape View File

@ -347,9 +347,7 @@ void phch_common::reset() {
sr_last_tx_tti = -1;
cur_pusch_power = 0;
avg_snr_db_cqi = 0;
avg_snr_db_sync = 0;
avg_rsrp = 0;
avg_rsrp_cqi = 0;
avg_rsrp_dbm = 0;
avg_rsrq_db = 0;

4
srsue/src/phy/phch_recv.cc
Unescape Escape View File

@ -686,6 +686,10 @@ void phch_recv::set_ue_sync_opts(srslte_ue_sync_t *q, float cfo)
srslte_sync_set_cfo_cp_enable(&q->sfind, false, 0);
}
// Set SFO ema and correct period
srslte_ue_sync_set_sfo_correct_period(q, worker_com->args->sfo_correct_period);
srslte_ue_sync_set_sfo_ema(q, worker_com->args->sfo_ema);
sss_alg_t sss_alg = SSS_FULL;
if (!worker_com->args->sss_algorithm.compare("diff")) {
sss_alg = SSS_DIFF;

31
srsue/src/phy/phch_worker.cc
Unescape Escape View File

@ -479,13 +479,13 @@ void phch_worker::work_imp()
}
if (chest_ok) {
if (phy->avg_rsrp_sync_dbm > -130.0 && phy->avg_snr_db_sync > -10.0) {
if (phy->avg_rsrp_dbm > -130.0 && phy->avg_snr_db_cqi > -6.0) {
log_h->debug("SNR=%.1f dB, RSRP=%.1f dBm sync=in-sync from channel estimator\n",
phy->avg_snr_db_sync, phy->avg_rsrp_sync_dbm);
phy->avg_snr_db_cqi, phy->avg_rsrp_dbm);
chest_loop->in_sync();
} else {
log_h->warning("SNR=%.1f dB RSRP=%.1f dBm, sync=out-of-sync from channel estimator\n",
phy->avg_snr_db_sync, phy->avg_rsrp_sync_dbm);
phy->avg_snr_db_cqi, phy->avg_rsrp_dbm);
chest_loop->out_of_sync();
}
}
@ -1577,7 +1577,7 @@ void phch_worker::update_measurements()
}
// Average RSRP taken from CRS
float rsrp_lin = srslte_chest_dl_get_rsrp_neighbour(&ue_dl.chest);
float rsrp_lin = srslte_chest_dl_get_rsrp(&ue_dl.chest);
if (isnormal(rsrp_lin)) {
if (!phy->avg_rsrp) {
phy->avg_rsrp = SRSLTE_VEC_EMA(rsrp_lin, phy->avg_rsrp, snr_ema_coeff);
@ -1617,28 +1617,7 @@ void phch_worker::update_measurements()
}
}
// To compute CQI use RSRP measurements from resource elements in RS since is more robust to time offset
float rsrp_lin_cqi = srslte_chest_dl_get_rsrp(&ue_dl.chest);
if (isnormal(rsrp_lin_cqi)) {
if (!phy->avg_rsrp_cqi) {
phy->avg_rsrp_cqi = SRSLTE_VEC_EMA(rsrp_lin_cqi, phy->avg_rsrp_cqi, snr_ema_coeff);
} else {
phy->avg_rsrp_cqi = rsrp_lin_cqi;
}
}
float rsrp_sync_dbm = 10*log10(rsrp_lin_cqi) + 30 - phy->rx_gain_offset;
if (isnormal(rsrp_sync_dbm)) {
if (!phy->avg_rsrp_sync_dbm) {
phy->avg_rsrp_sync_dbm = rsrp_sync_dbm;
} else {
phy->avg_rsrp_sync_dbm = SRSLTE_VEC_EMA(rsrp_sync_dbm, phy->avg_rsrp_sync_dbm, snr_ema_coeff);
}
}
// We compute 2 SNR metrics, 1 for deciding in-sync/out-of-sync and another for CQI measurements
phy->avg_snr_db_cqi = 10*log10(phy->avg_rsrp_cqi/phy->avg_noise); // this for CQI
phy->avg_snr_db_sync = 10*log10(phy->avg_rsrp/phy->avg_noise); // this for sync
phy->avg_snr_db_cqi = 10*log10(phy->avg_rsrp/phy->avg_noise);
// Store metrics
dl_metrics.n = phy->avg_noise;

6
srsue/ue.conf.example
Unescape Escape View File

@ -153,7 +153,9 @@ enable = false
# good for long channels. For best performance at highest SNR reduce it to 1.
# sfo_correct_disable: Disables phase correction before channel estimation to compensate for
# sampling frequency offset. Default is enabled.
# sss_algorithm: Selects the SSS estimation algorithm. Can choose between
# sfo_ema: EMA coefficient to average sample offsets used to compute SFO
# sfo_correct_period: Period in ms to correct sample time to adjust for SFO
# sss_algorithm: Selects the SSS estimation algorithm. Can choose between
# {full, partial, diff}.
# estimator_fil_auto: The channel estimator smooths the channel estimate with an adaptative filter.
# estimator_fil_stddev: Sets the channel estimator smooth gaussian filter standard deviation.
@ -211,6 +213,8 @@ enable = false
#equalizer_mode = mmse
#time_correct_period = 5
#sfo_correct_disable = false
#sfo_ema = 0.1
#sfo_correct_period = 10
#sss_algorithm = full
#estimator_fil_auto = false
#estimator_fil_stddev = 1.0

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