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536 lines
13 KiB
C
536 lines
13 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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "srslte/common/phy_common.h"
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#include "srslte/common/sequence.h"
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#ifdef FORCE_STANDARD_RATE
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static bool use_standard_rates = true;
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#else
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static bool use_standard_rates = false;
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#endif
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/* Returns true if the structure pointed by cell has valid parameters
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*/
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bool srslte_cellid_isvalid(uint32_t cell_id) {
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if (cell_id < 504) {
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return true;
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} else {
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return false;
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}
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}
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bool srslte_nofprb_isvalid(uint32_t nof_prb) {
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if (nof_prb >= 6 && nof_prb <= SRSLTE_MAX_PRB) {
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return true;
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} else {
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return false;
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}
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}
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bool srslte_cell_isvalid(srslte_cell_t *cell) {
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return srslte_cellid_isvalid(cell->id) &&
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srslte_portid_isvalid(cell->nof_ports) &&
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srslte_nofprb_isvalid(cell->nof_prb);
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}
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void srslte_cell_fprint(FILE *stream, srslte_cell_t *cell, uint32_t sfn) {
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fprintf(stream, " - Cell ID: %d\n", cell->id);
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fprintf(stream, " - Nof ports: %d\n", cell->nof_ports);
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fprintf(stream, " - CP: %s\n", srslte_cp_string(cell->cp));
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fprintf(stream, " - PRB: %d\n", cell->nof_prb);
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fprintf(stream, " - PHICH Length: %s\n",
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cell->phich_length == SRSLTE_PHICH_EXT ? "Extended" : "Normal");
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fprintf(stream, " - PHICH Resources: ");
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switch (cell->phich_resources) {
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case SRSLTE_PHICH_R_1_6:
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fprintf(stream, "1/6");
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break;
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case SRSLTE_PHICH_R_1_2:
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fprintf(stream, "1/2");
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break;
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case SRSLTE_PHICH_R_1:
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fprintf(stream, "1");
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break;
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case SRSLTE_PHICH_R_2:
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fprintf(stream, "2");
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break;
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}
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fprintf(stream, "\n");
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fprintf(stream, " - SFN: %d\n", sfn);
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}
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bool srslte_sfidx_isvalid(uint32_t sf_idx) {
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if (sf_idx <= SRSLTE_NSUBFRAMES_X_FRAME) {
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return true;
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} else {
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return false;
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}
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}
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bool srslte_portid_isvalid(uint32_t port_id) {
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if (port_id <= SRSLTE_MAX_PORTS) {
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return true;
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} else {
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return false;
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}
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}
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bool srslte_N_id_2_isvalid(uint32_t N_id_2) {
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if (N_id_2 < 3) {
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return true;
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} else {
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return false;
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}
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}
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bool srslte_N_id_1_isvalid(uint32_t N_id_1) {
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if (N_id_1 < 169) {
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return true;
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} else {
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return false;
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}
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}
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char *srslte_mod_string(srslte_mod_t mod) {
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switch (mod) {
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case SRSLTE_MOD_BPSK:
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return "BPSK";
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case SRSLTE_MOD_QPSK:
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return "QPSK";
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case SRSLTE_MOD_16QAM:
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return "16QAM";
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case SRSLTE_MOD_64QAM:
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return "64QAM";
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default:
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return "N/A";
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}
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}
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uint32_t srslte_mod_bits_x_symbol(srslte_mod_t mod) {
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switch (mod) {
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case SRSLTE_MOD_BPSK:
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return 1;
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case SRSLTE_MOD_QPSK:
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return 2;
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case SRSLTE_MOD_16QAM:
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return 4;
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case SRSLTE_MOD_64QAM:
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return 6;
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default:
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return 0;
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}
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}
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char *srslte_cp_string(srslte_cp_t cp) {
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if (cp == SRSLTE_CP_NORM) {
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return "Normal ";
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} else {
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return "Extended";
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}
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}
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/* Returns the new time advance N_ta_new as specified in Section 4.2.3 of 36.213 */
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uint32_t srslte_N_ta_new(uint32_t N_ta_old, uint32_t ta) {
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ta &= 63;
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int n_ta_new = N_ta_old + ((float) ta - 31) * 16;
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if (n_ta_new < 0) {
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return 0;
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} else {
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if (n_ta_new < 20512) {
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return (uint32_t) n_ta_new;
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} else {
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return 20512;
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}
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}
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}
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/* Returns the new time advance as indicated by the random access response
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* as specified in Section 4.2.3 of 36.213 */
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uint32_t srslte_N_ta_new_rar(uint32_t ta) {
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if (ta > 1282) {
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ta = 1282;
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}
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return ta*16;
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}
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void srslte_use_standard_symbol_size(bool enabled) {
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use_standard_rates = enabled;
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}
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int srslte_sampling_freq_hz(uint32_t nof_prb) {
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int n = srslte_symbol_sz(nof_prb);
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if (n == -1) {
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return SRSLTE_ERROR;
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} else {
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return 15000 * n;
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}
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}
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int srslte_symbol_sz_power2(uint32_t nof_prb) {
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if (nof_prb<=6) {
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return 128;
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} else if (nof_prb<=15) {
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return 256;
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} else if (nof_prb<=25) {
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return 512;
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} else if (nof_prb<=50) {
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return 1024;
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} else if (nof_prb<=75) {
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return 1536;
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} else if (nof_prb<=100) {
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return 2048;
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} else {
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return -1;
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}
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}
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int srslte_symbol_sz(uint32_t nof_prb) {
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if (nof_prb<=0) {
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return SRSLTE_ERROR;
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}
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if (!use_standard_rates) {
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if (nof_prb<=6) {
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return 128;
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} else if (nof_prb<=15) {
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return 256;
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} else if (nof_prb<=25) {
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return 384;
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} else if (nof_prb<=50) {
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return 768;
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} else if (nof_prb<=75) {
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return 1024;
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} else if (nof_prb<=100) {
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return 1536;
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} else {
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return SRSLTE_ERROR;
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}
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} else {
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return srslte_symbol_sz_power2(nof_prb);
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}
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}
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int srslte_nof_prb(uint32_t symbol_sz)
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{
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if (!use_standard_rates) {
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switch(symbol_sz) {
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case 128:
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return 6;
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case 256:
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return 15;
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case 384:
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return 25;
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case 768:
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return 50;
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case 1024:
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return 75;
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case 1536:
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return 100;
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}
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} else {
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switch(symbol_sz) {
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case 128:
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return 6;
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case 256:
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return 15;
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case 512:
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return 25;
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case 1024:
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return 50;
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case 1536:
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return 75;
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case 2048:
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return 100;
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}
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}
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return SRSLTE_ERROR;
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}
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bool srslte_symbol_sz_isvalid(uint32_t symbol_sz) {
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if (!use_standard_rates) {
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if (symbol_sz == 128 ||
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symbol_sz == 256 ||
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symbol_sz == 384 ||
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symbol_sz == 768 ||
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symbol_sz == 1024 ||
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symbol_sz == 1536) {
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return true;
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} else {
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return false;
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}
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} else {
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if (symbol_sz == 128 ||
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symbol_sz == 256 ||
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symbol_sz == 512 ||
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symbol_sz == 1024 ||
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symbol_sz == 1536 ||
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symbol_sz == 2048) {
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return true;
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} else {
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return false;
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}
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}
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}
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uint32_t srslte_voffset(uint32_t symbol_id, uint32_t cell_id, uint32_t nof_ports) {
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if (nof_ports == 1 && symbol_id==0) {
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return (cell_id+3) % 6;
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} else {
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return cell_id % 6;
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}
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}
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/** Computes sequence-group pattern f_gh according to 5.5.1.3 of 36.211 */
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int srslte_group_hopping_f_gh(uint32_t f_gh[SRSLTE_NSLOTS_X_FRAME], uint32_t cell_id) {
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srslte_sequence_t seq;
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bzero(&seq, sizeof(srslte_sequence_t));
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if (srslte_sequence_LTE_pr(&seq, 160, cell_id / 30)) {
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return SRSLTE_ERROR;
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}
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for (uint32_t ns=0;ns<SRSLTE_NSLOTS_X_FRAME;ns++) {
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f_gh[ns] = 0;
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for (int i = 0; i < 8; i++) {
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f_gh[ns] += (((uint32_t) seq.c[8 * ns + i]) << i);
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}
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}
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srslte_sequence_free(&seq);
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return SRSLTE_SUCCESS;
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}
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/* Returns the number of available RE per PRB */
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uint32_t srslte_re_x_prb(uint32_t ns, uint32_t symbol, uint32_t nof_ports, uint32_t nof_symbols) {
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if (symbol == 0) {
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if (((ns % 2) == 0) || (ns == 1)) {
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return SRSLTE_NRE - 4;
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} else {
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if (nof_ports == 1) {
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return SRSLTE_NRE - 2;
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} else {
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return SRSLTE_NRE - 4;
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}
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}
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} else if (symbol == 1) {
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if (ns == 1) {
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return SRSLTE_NRE - 4;
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} else if (nof_ports == 4) {
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return SRSLTE_NRE - 4;
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} else {
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return SRSLTE_NRE;
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}
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} else if (symbol == nof_symbols - 3) {
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if (nof_ports == 1) {
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return SRSLTE_NRE - 2;
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} else {
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return SRSLTE_NRE - 4;
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}
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} else {
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return SRSLTE_NRE;
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}
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}
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struct lte_band {
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uint32_t band;
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float fd_low_mhz;
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uint32_t earfcn_offset;
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uint32_t earfcn_max;
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float duplex_mhz;
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enum band_geographical_area area;
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};
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struct lte_band lte_bands[SRSLTE_NOF_LTE_BANDS] = {
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{1, 2110, 0, 599, 190, SRSLTE_BAND_GEO_AREA_ALL},
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{2, 1930, 600, 1199, 80, SRSLTE_BAND_GEO_AREA_NAR},
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{3, 1805, 1200, 1949, 95, SRSLTE_BAND_GEO_AREA_ALL},
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{4, 2110, 1950, 2399, 400, SRSLTE_BAND_GEO_AREA_NAR},
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{5, 869, 2400, 2649, 45, SRSLTE_BAND_GEO_AREA_NAR},
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{6, 875, 2650, 2749, 45, SRSLTE_BAND_GEO_AREA_APAC},
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{7, 2620, 2750, 3449, 120, SRSLTE_BAND_GEO_AREA_EMEA},
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{8, 925, 3450, 3799, 45, SRSLTE_BAND_GEO_AREA_ALL},
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{9, 1844.9, 3800, 4149, 95, SRSLTE_BAND_GEO_AREA_APAC},
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{10, 2110, 4150, 4749, 400, SRSLTE_BAND_GEO_AREA_NAR},
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{11, 1475.9, 4750, 4949, 48, SRSLTE_BAND_GEO_AREA_JAPAN},
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{12, 729, 5010, 5179, 30, SRSLTE_BAND_GEO_AREA_NAR},
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{13, 746, 5180, 5279, -31, SRSLTE_BAND_GEO_AREA_NAR},
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{14, 758, 5280, 5379, -30, SRSLTE_BAND_GEO_AREA_NAR},
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{17, 734, 5730, 5849, 30, SRSLTE_BAND_GEO_AREA_NAR},
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{18, 860, 5850, 5999, 45, SRSLTE_BAND_GEO_AREA_JAPAN},
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{19, 875, 6000, 6149, 45, SRSLTE_BAND_GEO_AREA_JAPAN},
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{20, 791, 6150, 6449, -41, SRSLTE_BAND_GEO_AREA_EMEA},
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{21, 1495.9, 6450, 6599, 48, SRSLTE_BAND_GEO_AREA_JAPAN},
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{22, 3500, 6600, 7399, 100, SRSLTE_BAND_GEO_AREA_NA},
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{23, 2180, 7500, 7699, 180, SRSLTE_BAND_GEO_AREA_NAR},
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{24, 1525, 7700, 8039, -101.5, SRSLTE_BAND_GEO_AREA_NAR},
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{25, 1930, 8040, 8689, 80, SRSLTE_BAND_GEO_AREA_NAR},
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{26, 859, 8690, 9039, 45, SRSLTE_BAND_GEO_AREA_NAR},
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{27, 852, 9040, 9209, 45, SRSLTE_BAND_GEO_AREA_NAR},
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{28, 758, 9210, 9659, 55, SRSLTE_BAND_GEO_AREA_APAC},
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{29, 717, 9660, 9769, 0, SRSLTE_BAND_GEO_AREA_NAR},
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{30, 2350, 9770, 9869, 45, SRSLTE_BAND_GEO_AREA_NAR},
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{31, 462.5, 9870, 9919, 10, SRSLTE_BAND_GEO_AREA_CALA}
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};
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#define EOF_BAND 9919
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int srslte_str2mimotype(char *mimo_type_str, srslte_mimo_type_t *type) {
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if (!strcmp(mimo_type_str, "single")) {
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*type = SRSLTE_MIMO_TYPE_SINGLE_ANTENNA;
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} else if (!strcmp(mimo_type_str, "diversity")) {
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*type = SRSLTE_MIMO_TYPE_TX_DIVERSITY;
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} else if (!strcmp(mimo_type_str, "multiplex")) {
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*type = SRSLTE_MIMO_TYPE_SPATIAL_MULTIPLEX;
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} else {
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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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float get_fd(struct lte_band *band, uint32_t earfcn) {
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if (earfcn >= band->earfcn_offset) {
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return band->fd_low_mhz + 0.1*(earfcn - band->earfcn_offset);
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} else {
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return 0.0;
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}
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}
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int srslte_band_get_band(uint32_t earfcn) {
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uint32_t i = SRSLTE_NOF_LTE_BANDS-1;
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while(i > 0 && lte_bands[i].earfcn_offset>earfcn) {
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i--;
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}
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return lte_bands[i].band;
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}
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float srslte_band_fd(uint32_t earfcn) {
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if (earfcn > lte_bands[SRSLTE_NOF_LTE_BANDS-1].earfcn_max) {
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return -1;
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}
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uint32_t i = SRSLTE_NOF_LTE_BANDS-1;
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while(i > 0 && lte_bands[i].earfcn_offset>earfcn) {
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i--;
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}
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return get_fd(<e_bands[i], earfcn);
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}
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float srslte_band_fu(uint32_t earfcn) {
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if (earfcn > lte_bands[SRSLTE_NOF_LTE_BANDS-1].earfcn_max) {
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return -1;
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}
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uint32_t i = SRSLTE_NOF_LTE_BANDS-1;
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while(i > 0 && lte_bands[i].earfcn_offset>earfcn) {
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i--;
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}
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return get_fd(<e_bands[i], earfcn) - lte_bands[i].duplex_mhz;
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}
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int srslte_band_get_fd_band_all(uint32_t band, srslte_earfcn_t *earfcn, uint32_t max_elems) {
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return srslte_band_get_fd_band(band, earfcn, -1, -1, max_elems);
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}
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int srslte_band_get_fd_band(uint32_t band, srslte_earfcn_t *earfcn, int start_earfcn, int end_earfcn, uint32_t max_elems) {
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uint32_t i, j;
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uint32_t nof_earfcn;
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i=0;
|
|
while(i < SRSLTE_NOF_LTE_BANDS && lte_bands[i].band != band) {
|
|
i++;
|
|
}
|
|
if (i == SRSLTE_NOF_LTE_BANDS) {
|
|
fprintf(stderr, "Error: Invalid band %d\n", band);
|
|
return SRSLTE_ERROR;
|
|
}
|
|
if (end_earfcn == -1) {
|
|
end_earfcn = lte_bands[i].earfcn_max;
|
|
} else {
|
|
if (end_earfcn > lte_bands[i].earfcn_max) {
|
|
fprintf(stderr, "Error: Invalid end earfcn %d. Max is %d\n", end_earfcn, lte_bands[i].earfcn_max);
|
|
return SRSLTE_ERROR;
|
|
}
|
|
}
|
|
if (start_earfcn == -1) {
|
|
start_earfcn = lte_bands[i].earfcn_offset;
|
|
} else {
|
|
if (start_earfcn < lte_bands[i].earfcn_offset) {
|
|
fprintf(stderr, "Error: Invalid start earfcn %d. Min is %d\n", start_earfcn, lte_bands[i].earfcn_offset);
|
|
return SRSLTE_ERROR;
|
|
}
|
|
}
|
|
nof_earfcn = end_earfcn - start_earfcn;
|
|
|
|
if (nof_earfcn > max_elems) {
|
|
nof_earfcn = max_elems;
|
|
}
|
|
for (j=0;j<nof_earfcn;j++) {
|
|
earfcn[j].id = j + start_earfcn;
|
|
earfcn[j].fd = get_fd(<e_bands[i], earfcn[j].id);
|
|
}
|
|
return (int) j;
|
|
}
|
|
|
|
int srslte_band_get_fd_region(enum band_geographical_area region, srslte_earfcn_t *earfcn, uint32_t max_elems) {
|
|
uint32_t i;
|
|
int n;
|
|
int nof_fd = 0;
|
|
for (i=0;i<SRSLTE_NOF_LTE_BANDS && max_elems > 0;i++) {
|
|
if (lte_bands[i].area == region) {
|
|
n = srslte_band_get_fd_band(i, &earfcn[nof_fd], -1, -1, max_elems);
|
|
if (n != -1) {
|
|
nof_fd += n;
|
|
max_elems -= n;
|
|
} else {
|
|
return SRSLTE_ERROR;
|
|
}
|
|
}
|
|
}
|
|
return nof_fd;
|
|
}
|
|
|
|
|
|
/* Returns the interval tti1-tti2 mod 10240 */
|
|
uint32_t srslte_tti_interval(uint32_t tti1, uint32_t tti2) {
|
|
if (tti1 > tti2) {
|
|
return tti1-tti2;
|
|
} else {
|
|
return 10240-tti2+tti1;
|
|
}
|
|
}
|
|
|
|
|