272 lines
8.0 KiB
C++
272 lines
8.0 KiB
C++
/*
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* Copyright 2013-2020 Software Radio Systems Limited
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*
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* This file is part of srsLTE.
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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 "srsue/hdr/phy/prach.h"
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#include "srslte/common/log.h"
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#include "srslte/interfaces/ue_interfaces.h"
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#include "srslte/srslte.h"
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#define Error(fmt, ...) \
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if (SRSLTE_DEBUG_ENABLED) \
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log_h->error(fmt, ##__VA_ARGS__)
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#define Warning(fmt, ...) \
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if (SRSLTE_DEBUG_ENABLED) \
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log_h->warning(fmt, ##__VA_ARGS__)
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#define Info(fmt, ...) \
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if (SRSLTE_DEBUG_ENABLED) \
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log_h->info(fmt, ##__VA_ARGS__)
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#define Debug(fmt, ...) \
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if (SRSLTE_DEBUG_ENABLED) \
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log_h->debug(fmt, ##__VA_ARGS__)
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using namespace srsue;
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void prach::init(uint32_t max_prb, srslte::log* log_h_)
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{
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log_h = log_h_;
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for (auto& i : buffer) {
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for (auto& j : i) {
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j = srslte_vec_cf_malloc(SRSLTE_PRACH_MAX_LEN);
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if (!j) {
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perror("malloc");
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return;
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}
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}
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}
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if (srslte_cfo_init(&cfo_h, SRSLTE_PRACH_MAX_LEN)) {
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ERROR("PRACH: Error initiating CFO\n");
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return;
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}
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srslte_cfo_set_tol(&cfo_h, 0);
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signal_buffer = srslte_vec_cf_malloc(MAX_LEN_SF * 30720U);
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if (!signal_buffer) {
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perror("malloc");
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return;
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}
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if (srslte_prach_init(&prach_obj, srslte_symbol_sz(max_prb))) {
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Error("Initiating PRACH library\n");
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return;
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}
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mem_initiated = true;
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}
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void prach::stop()
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{
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if (!mem_initiated) {
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return;
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}
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for (auto& i : buffer) {
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for (auto& j : i) {
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free(j);
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}
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}
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free(signal_buffer);
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srslte_cfo_free(&cfo_h);
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srslte_prach_free(&prach_obj);
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mem_initiated = false;
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}
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void prach::reset_cfg()
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{
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cell_initiated = false;
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}
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bool prach::set_cell(srslte_cell_t cell_, srslte_prach_cfg_t prach_cfg)
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{
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if (!mem_initiated) {
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ERROR("PRACH: Error must call init() first\n");
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return false;
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}
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// TODO: Check if other PRACH parameters changed
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if (cell.id == cell_.id && cell_initiated) {
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return true;
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}
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cell = cell_;
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cfg = prach_cfg;
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// We must not reset preamble_idx here, MAC might have already called prepare_to_send()
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if (6 + prach_cfg.freq_offset > cell.nof_prb) {
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srslte::console("Error no space for PRACH: frequency offset=%d, N_rb_ul=%d\n", prach_cfg.freq_offset, cell.nof_prb);
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log_h->error("Error no space for PRACH: frequency offset=%d, N_rb_ul=%d\n", prach_cfg.freq_offset, cell.nof_prb);
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return false;
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}
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Info("PRACH: configIdx=%d, rootSequence=%d, zeroCorrelationConfig=%d, freqOffset=%d\n",
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prach_cfg.config_idx,
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prach_cfg.root_seq_idx,
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prach_cfg.zero_corr_zone,
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prach_cfg.freq_offset);
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if (srslte_prach_set_cfg(&prach_obj, &prach_cfg, cell.nof_prb)) {
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Error("Initiating PRACH library\n");
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return false;
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}
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buffer_bitmask.reset();
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len = prach_obj.N_seq + prach_obj.N_cp;
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transmitted_tti = -1;
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cell_initiated = true;
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return true;
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}
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bool prach::generate_buffer(uint32_t f_idx)
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{
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if (is_buffer_generated(f_idx, preamble_idx)) {
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return true;
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}
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uint32_t freq_offset = cfg.freq_offset;
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if (cell.frame_type == SRSLTE_TDD) {
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freq_offset = srslte_prach_f_ra_tdd(
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cfg.config_idx, cfg.tdd_config.sf_config, (f_idx / 6) * 10, f_idx % 6, cfg.freq_offset, cell.nof_prb);
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}
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if (srslte_prach_gen(&prach_obj, preamble_idx, freq_offset, buffer[f_idx][preamble_idx])) {
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Error("Generating PRACH preamble %d\n", preamble_idx);
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return false;
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}
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set_buffer_as_generated(f_idx, preamble_idx);
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return true;
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}
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bool prach::prepare_to_send(uint32_t preamble_idx_, int allowed_subframe_, float target_power_dbm_)
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{
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if (preamble_idx_ >= max_preambles) {
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Error("PRACH: Invalid preamble %d\n", preamble_idx_);
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return false;
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}
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preamble_idx = preamble_idx_;
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target_power_dbm = target_power_dbm_;
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allowed_subframe = allowed_subframe_;
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transmitted_tti = -1;
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Debug("PRACH: prepare to send preamble %d\n", preamble_idx);
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return true;
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}
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bool prach::is_pending() const
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{
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return cell_initiated && preamble_idx >= 0 && unsigned(preamble_idx) < max_preambles;
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}
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bool prach::is_ready_to_send(uint32_t current_tti_, uint32_t current_pci)
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{
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// Make sure the curernt PCI is the one we configured the PRACH for
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if (is_pending() && current_pci == cell.id) {
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// consider the number of subframes the transmission must be anticipated
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uint32_t tti_tx = TTI_TX(current_tti_);
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if (srslte_prach_tti_opportunity(&prach_obj, tti_tx, allowed_subframe)) {
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Debug("PRACH Buffer: Ready to send at tti: %d (now is %d)\n", tti_tx, current_tti_);
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transmitted_tti = tti_tx;
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return true;
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}
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}
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return false;
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}
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phy_interface_mac_lte::prach_info_t prach::get_info() const
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{
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phy_interface_mac_lte::prach_info_t info = {};
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info.preamble_format = prach_obj.config_idx / 16;
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if (transmitted_tti >= 0) {
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info.tti_ra = (uint32_t)transmitted_tti;
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if (cell.frame_type == SRSLTE_TDD) {
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info.f_id =
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srslte_prach_f_id_tdd(prach_obj.config_idx, prach_obj.tdd_config.sf_config, prach_obj.current_prach_idx);
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}
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info.is_transmitted = true;
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} else {
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info.is_transmitted = false;
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}
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return info;
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}
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cf_t* prach::generate(float cfo, uint32_t* nof_sf, float* target_power)
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{
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if (!cell_initiated || preamble_idx < 0 || !nof_sf || unsigned(preamble_idx) >= max_preambles ||
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!srslte_cell_isvalid(&cell) || len >= MAX_LEN_SF * 30720 || len == 0) {
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Error("PRACH: Invalid parameters: cell_initiated=%d, preamble_idx=%d, cell.nof_prb=%d, len=%d\n",
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cell_initiated,
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preamble_idx,
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cell.nof_prb,
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len);
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return nullptr;
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}
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uint32_t f_idx = 0;
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if (cell.frame_type == SRSLTE_TDD) {
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f_idx = prach_obj.current_prach_idx;
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// For format4, choose odd or even position
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if (prach_obj.config_idx >= 48) {
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f_idx += 6;
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}
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if (f_idx >= max_fs) {
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Error("PRACH Buffer: Invalid f_idx=%d\n", f_idx);
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f_idx = 0;
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}
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}
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if (!generate_buffer(f_idx)) {
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return nullptr;
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}
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if (!is_buffer_generated(f_idx, preamble_idx)) {
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Error("PRACH Buffer not generated: f_idx=%d preamble_idx=%d\n", f_idx, preamble_idx);
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return nullptr;
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}
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// Correct CFO before transmission
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srslte_cfo_correct(&cfo_h, buffer[f_idx][preamble_idx], signal_buffer, cfo / srslte_symbol_sz(cell.nof_prb));
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// pad guard symbols with zeros
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uint32_t nsf = (len - 1) / SRSLTE_SF_LEN_PRB(cell.nof_prb) + 1;
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srslte_vec_cf_zero(&signal_buffer[len], (nsf * SRSLTE_SF_LEN_PRB(cell.nof_prb) - len));
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*nof_sf = nsf;
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if (target_power) {
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*target_power = target_power_dbm;
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}
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Info("PRACH: Transmitted preamble=%d, tti_tx=%d, CFO=%.2f KHz, nof_sf=%d, target_power=%.1f dBm\n",
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preamble_idx,
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transmitted_tti,
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cfo * 15,
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nsf,
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target_power_dbm);
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preamble_idx = -1;
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return signal_buffer;
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}
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