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srsLTE
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Added Power Allocation from HL in UE side

This commit is contained in:
Xavier Arteaga 2017-11-21 16:11:08 +01:00
parent 4ecd73c984
commit 58aac96a6e
3 changed files with 41 additions and 3 deletions
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7
lib/include/srslte/phy/phch/pdsch_cfg.h
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@ -39,6 +39,13 @@
#include "srslte/phy/fec/softbuffer.h"
#include "srslte/phy/fec/cbsegm.h"
/* 3GPP 36.213 Table 5.2-1: The cell-specific ratio rho_B / rho_A for 1, 2, or 4 cell specific antenna ports */
static const float pdsch_cfg_cell_specific_ratio_table[2][4] =
{ /* One antenna port */ {1.0f / 1.0f, 4.0f / 5.0f, 3.0f / 5.0f, 2.0f / 5.0f},
/* Two or more antenna port */ {5.0f / 4.0f, 1.0f / 1.0f, 3.0f / 4.0f, 1.0f / 2.0f}
};
typedef struct SRSLTE_API {
srslte_cbsegm_t cb_segm[SRSLTE_MAX_CODEWORDS];
srslte_ra_dl_grant_t grant;

28
lib/src/phy/ue/ue_dl.c
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@ -308,10 +308,36 @@ void srslte_ue_dl_set_non_mbsfn_region(srslte_ue_dl_t *q,
srslte_ofdm_set_non_mbsfn_region(&q->fft_mbsfn, non_mbsfn_region_length);
}
void srslte_ue_dl_set_power_alloc (srslte_ue_dl_t *q, float rho_a, float rho_b) {
void srslte_ue_dl_set_power_alloc(srslte_ue_dl_t *q, float rho_a, float rho_b) {
if (q) {
srslte_pdsch_set_power_allocation(&q->pdsch, rho_a);
q->rho_b = rho_b;
uint32_t nof_symbols_slot = SRSLTE_CP_NSYMB(q->cell.cp);
uint32_t nof_re_symbol = SRSLTE_NRE * q->cell.nof_prb;
/* Apply rho_b if required according to 3GPP 36.213 Table 5.2-2 */
if (rho_b != 0.0f && rho_b != 1.0f) {
float scaling = 1.0f / rho_b;
for (uint32_t i = 0; i < q->nof_rx_antennas; i++) {
for (uint32_t j = 0; j < 2; j++) {
cf_t *ptr;
ptr = q->sf_symbols_m[i] + nof_re_symbol * (j * nof_symbols_slot + 0);
srslte_vec_sc_prod_cfc(ptr, scaling, ptr, nof_re_symbol);
if (q->cell.cp == SRSLTE_CP_NORM) {
ptr = q->sf_symbols_m[i] + nof_re_symbol * (j * nof_symbols_slot + 4);
srslte_vec_sc_prod_cfc(ptr, scaling, ptr, nof_re_symbol);
} else {
ptr = q->sf_symbols_m[i] + nof_re_symbol * (j * nof_symbols_slot + 3);
srslte_vec_sc_prod_cfc(ptr, scaling, ptr, nof_re_symbol);
}
if (q->cell.nof_ports == 4) {
ptr = q->sf_symbols_m[i] + nof_re_symbol * (j * nof_symbols_slot + 1);
srslte_vec_sc_prod_cfc(ptr, scaling, ptr, nof_re_symbol);
}
}
}
}
}
}

9
srsue/src/phy/phch_worker.cc
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@ -601,11 +601,16 @@ int phch_worker::decode_pdsch(srslte_ra_dl_grant_t *grant, uint8_t *payload[SRSL
valid_config = false;
}
/* Set power allocation */
/* Set power allocation according to 3GPP 36.213 clause 5.2 Downlink power allocation */
float rho_a = 1.0f, rho_b = 1.0f;
if (phy->config->dedicated.pdsch_cnfg_ded < LIBLTE_RRC_PDSCH_CONFIG_P_A_N_ITEMS) {
float rho_a_db = liblte_rrc_pdsch_config_p_a_num[(int) phy->config->dedicated.pdsch_cnfg_ded];
rho_a = powf(10.0f, rho_a_db / 20.0f) * sqrtf(2.0f);
rho_a = powf(10.0f, rho_a_db / 20.0f) * ((cell.nof_ports == 1) ? 1.0f : sqrtf(2.0f));
}
if (phy->config->common.pdsch_cnfg.p_b < 4) {
uint32_t idx0 = (cell.nof_ports == 1) ? 0 : 1;
float cell_specific_ratio = pdsch_cfg_cell_specific_ratio_table[idx0][phy->config->common.pdsch_cnfg.p_b];
rho_b = sqrtf(cell_specific_ratio);
}
srslte_ue_dl_set_power_alloc(&ue_dl, rho_a, rho_b);