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282 lines
8.2 KiB
C
282 lines
8.2 KiB
C
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2015 Software Radio Systems Limited
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*
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* \section LICENSE
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*
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* This file is part of the srsLTE library.
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*
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* srsLTE is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* srsLTE is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* A copy of the GNU Affero General Public License can be found in
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* the LICENSE file in the top-level directory of this distribution
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* and at http://www.gnu.org/licenses/.
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*
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*/
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#include "srslte/enb/enb_dl.h"
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#include <complex.h>
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#include <math.h>
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#include <string.h>
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#define CURRENT_FFTSIZE srslte_symbol_sz(q->cell.nof_prb)
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#define CURRENT_SFLEN SRSLTE_SF_LEN(CURRENT_FFTSIZE)
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#define CURRENT_SLOTLEN_RE SRSLTE_SLOT_LEN_RE(q->cell.nof_prb, q->cell.cp)
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#define CURRENT_SFLEN_RE SRSLTE_SF_LEN_RE(q->cell.nof_prb, q->cell.cp)
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#define SRSLTE_ENB_RF_AMP 0.1
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int srslte_enb_dl_init(srslte_enb_dl_t *q, srslte_cell_t cell)
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{
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int ret = SRSLTE_ERROR_INVALID_INPUTS;
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if (q != NULL &&
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srslte_cell_isvalid(&cell))
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{
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ret = SRSLTE_ERROR;
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bzero(q, sizeof(srslte_enb_dl_t));
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q->cell = cell;
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q->cfi = 3;
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q->tx_amp = SRSLTE_ENB_RF_AMP;
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if (srslte_ofdm_tx_init(&q->ifft, q->cell.cp, q->cell.nof_prb)) {
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fprintf(stderr, "Error initiating FFT\n");
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goto clean_exit;
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}
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srslte_ofdm_set_normalize(&q->ifft, true);
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if (srslte_regs_init(&q->regs, q->cell)) {
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fprintf(stderr, "Error initiating REGs\n");
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goto clean_exit;
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}
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if (srslte_pbch_init(&q->pbch, q->cell)) {
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fprintf(stderr, "Error creating PBCH object\n");
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goto clean_exit;
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}
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if (srslte_pcfich_init(&q->pcfich, &q->regs, q->cell)) {
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fprintf(stderr, "Error creating PCFICH object\n");
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goto clean_exit;
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}
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if (srslte_phich_init(&q->phich, &q->regs, q->cell)) {
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fprintf(stderr, "Error creating PHICH object\n");
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goto clean_exit;
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}
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if (srslte_pdcch_init(&q->pdcch, &q->regs, q->cell)) {
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fprintf(stderr, "Error creating PDCCH object\n");
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goto clean_exit;
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}
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if (srslte_pdsch_init(&q->pdsch, q->cell)) {
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fprintf(stderr, "Error creating PDSCH object\n");
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goto clean_exit;
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}
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if (srslte_refsignal_cs_init(&q->csr_signal, q->cell)) {
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fprintf(stderr, "Error initializing CSR signal (%d)\n",ret);
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goto clean_exit;
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}
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for (int i=0;i<q->cell.nof_ports;i++) {
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q->sf_symbols[i] = srslte_vec_malloc(CURRENT_SFLEN_RE * sizeof(cf_t));
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if (!q->sf_symbols[i]) {
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perror("malloc");
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goto clean_exit;
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}
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q->slot1_symbols[i] = &q->sf_symbols[i][CURRENT_SLOTLEN_RE];
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}
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/* Generate PSS/SSS signals */
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srslte_pss_generate(q->pss_signal, cell.id%3);
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srslte_sss_generate(q->sss_signal0, q->sss_signal5, cell.id);
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ret = SRSLTE_SUCCESS;
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} else {
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fprintf(stderr, "Invalid cell properties: Id=%d, Ports=%d, PRBs=%d\n",
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cell.id, cell.nof_ports, cell.nof_prb);
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}
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clean_exit:
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if (ret == SRSLTE_ERROR) {
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srslte_enb_dl_free(q);
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}
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return ret;
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}
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void srslte_enb_dl_free(srslte_enb_dl_t *q)
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{
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if (q) {
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srslte_ofdm_tx_free(&q->ifft);
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srslte_regs_free(&q->regs);
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srslte_pcfich_free(&q->pcfich);
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srslte_phich_free(&q->phich);
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srslte_pdcch_free(&q->pdcch);
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srslte_pdsch_free(&q->pdsch);
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srslte_refsignal_cs_free(&q->csr_signal);
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for (int i=0;i<SRSLTE_MAX_PORTS;i++) {
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if (q->sf_symbols[i]) {
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free(q->sf_symbols[i]);
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}
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}
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bzero(q, sizeof(srslte_enb_dl_t));
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}
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}
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void srslte_enb_dl_set_amp(srslte_enb_dl_t *q, float amp)
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{
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q->tx_amp = amp;
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}
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void srslte_enb_dl_set_cfi(srslte_enb_dl_t *q, uint32_t cfi)
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{
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q->cfi = cfi;
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srslte_regs_set_cfi(&q->regs, cfi);
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}
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void srslte_enb_dl_clear_sf(srslte_enb_dl_t *q)
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{
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for (int i=0;i<q->cell.nof_ports;i++) {
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bzero(q->sf_symbols[i], CURRENT_SFLEN_RE * sizeof(cf_t));
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}
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}
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void srslte_enb_dl_put_sync(srslte_enb_dl_t *q, uint32_t sf_idx)
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{
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if (sf_idx == 0 || sf_idx == 5) {
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srslte_pss_put_slot(q->pss_signal, q->sf_symbols[0], q->cell.nof_prb, q->cell.cp);
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srslte_sss_put_slot(sf_idx ? q->sss_signal5 : q->sss_signal0, q->sf_symbols[0],
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q->cell.nof_prb, SRSLTE_CP_NORM);
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}
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}
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void srslte_enb_dl_put_refs(srslte_enb_dl_t *q, uint32_t sf_idx)
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{
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srslte_refsignal_cs_put_sf(q->cell, 0, q->csr_signal.pilots[0][sf_idx], q->sf_symbols[0]);
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}
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void srslte_enb_dl_put_mib(srslte_enb_dl_t *q, uint32_t tti)
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{
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uint8_t bch_payload[SRSLTE_BCH_PAYLOAD_LEN];
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if ((tti%10) == 0) {
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srslte_pbch_mib_pack(&q->cell, tti/10, bch_payload);
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srslte_pbch_encode(&q->pbch, bch_payload, q->slot1_symbols, ((tti/10)%4));
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}
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}
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void srslte_enb_dl_put_pcfich(srslte_enb_dl_t *q, uint32_t sf_idx)
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{
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srslte_pcfich_encode(&q->pcfich, q->cfi, q->sf_symbols, sf_idx);
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}
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void srslte_enb_dl_put_phich(srslte_enb_dl_t *q, uint8_t ack, uint32_t n_prb_lowest,
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uint32_t n_dmrs, uint32_t sf_idx)
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{
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uint32_t ngroup, nseq;
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srslte_phich_calc(&q->phich, n_prb_lowest, n_dmrs, &ngroup, &nseq);
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srslte_phich_encode(&q->phich, ack, ngroup, nseq, sf_idx, q->sf_symbols);
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}
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void srslte_enb_dl_put_base(srslte_enb_dl_t *q, uint32_t tti)
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{
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uint32_t sf_idx = tti%10;
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srslte_enb_dl_put_sync(q, sf_idx);
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srslte_enb_dl_put_refs(q, sf_idx);
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srslte_enb_dl_put_mib(q, tti);
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srslte_enb_dl_put_pcfich(q, sf_idx);
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}
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void srslte_enb_dl_gen_signal(srslte_enb_dl_t *q, cf_t *signal_buffer)
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{
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srslte_ofdm_tx_sf(&q->ifft, q->sf_symbols[0], signal_buffer);
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// TODO: PAPR control
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float norm_factor = (float) sqrt(q->cell.nof_prb)/15;
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srslte_vec_sc_prod_cfc(signal_buffer, q->tx_amp*norm_factor, signal_buffer, SRSLTE_SF_LEN_PRB(q->cell.nof_prb));
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}
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int srslte_enb_dl_add_rnti(srslte_enb_dl_t *q, uint16_t rnti)
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{
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return srslte_pdsch_set_rnti(&q->pdsch, rnti);
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}
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void srslte_enb_dl_rem_rnti(srslte_enb_dl_t *q, uint16_t rnti)
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{
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srslte_pdsch_free_rnti(&q->pdsch, rnti);
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}
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int srslte_enb_dl_put_pdcch_dl(srslte_enb_dl_t *q, srslte_ra_dl_dci_t *grant,
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srslte_dci_format_t format, srslte_dci_location_t location,
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uint16_t rnti, uint32_t sf_idx)
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{
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srslte_dci_msg_t dci_msg;
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bool rnti_is_user = true;
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if (rnti == SRSLTE_SIRNTI || rnti == SRSLTE_PRNTI || (rnti >= SRSLTE_RARNTI_START && rnti <= SRSLTE_RARNTI_END)) {
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rnti_is_user = false;
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}
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srslte_dci_msg_pack_pdsch(grant, format, &dci_msg, q->cell.nof_prb, q->cell.nof_ports, rnti_is_user);
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if (srslte_pdcch_encode(&q->pdcch, &dci_msg, location, rnti, q->sf_symbols, sf_idx, q->cfi)) {
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fprintf(stderr, "Error encoding DCI message\n");
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return SRSLTE_ERROR;
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}
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return SRSLTE_SUCCESS;
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}
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int srslte_enb_dl_put_pdcch_ul(srslte_enb_dl_t *q, srslte_ra_ul_dci_t *grant,
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srslte_dci_location_t location,
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uint16_t rnti, uint32_t sf_idx)
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{
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srslte_dci_msg_t dci_msg;
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srslte_dci_msg_pack_pusch(grant, &dci_msg, q->cell.nof_prb);
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if (srslte_pdcch_encode(&q->pdcch, &dci_msg, location, rnti, q->sf_symbols, sf_idx, q->cfi)) {
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fprintf(stderr, "Error encoding DCI message\n");
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return SRSLTE_ERROR;
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}
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return SRSLTE_SUCCESS;
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}
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int srslte_enb_dl_put_pdsch(srslte_enb_dl_t *q, srslte_ra_dl_grant_t *grant, srslte_softbuffer_tx_t *softbuffer,
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uint16_t rnti, uint32_t rv_idx, uint32_t sf_idx,
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uint8_t *data)
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{
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/* Configure pdsch_cfg parameters */
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if (srslte_pdsch_cfg(&q->pdsch_cfg, q->cell, grant, q->cfi, sf_idx, rv_idx)) {
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fprintf(stderr, "Error configuring PDSCH\n");
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return SRSLTE_ERROR;
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}
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/* Encode PDSCH */
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if (srslte_pdsch_encode(&q->pdsch, &q->pdsch_cfg, softbuffer, data, rnti, q->sf_symbols)) {
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fprintf(stderr, "Error encoding PDSCH\n");
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return SRSLTE_ERROR;
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}
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return SRSLTE_SUCCESS;
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}
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