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srsRAN_4G/srslte/lib/phch/ra.c

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/**
*
* \section COPYRIGHT
*
* Copyright 2013-2015 Software Radio Systems Limited
*
* \section LICENSE
*
* This file is part of the srsLTE library.
*
* srsLTE is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* srsLTE is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* A copy of the GNU Affero General Public License can be found in
* the LICENSE file in the top-level directory of this distribution
* and at http://www.gnu.org/licenses/.
*
*/
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <math.h>
#include "srslte/common/phy_common.h"
#include "srslte/utils/bit.h"
#include "srslte/utils/vector.h"
#include "srslte/utils/debug.h"
#include "srslte/phch/ra.h"
#include "srslte/utils/bit.h"
#include "tbs_tables.h"
#define min(a,b) (a<b?a:b)
/* Returns the number of RE in a PRB in a slot and subframe */
uint32_t ra_re_x_prb(uint32_t subframe, uint32_t slot, uint32_t prb_idx, uint32_t nof_prb,
uint32_t nof_ports, uint32_t nof_ctrl_symbols, srslte_cp_t cp) {
uint32_t re;
bool skip_refs = false;
if (slot == 0) {
re = (SRSLTE_CP_NSYMB(cp) - nof_ctrl_symbols) * SRSLTE_NRE;
} else {
re = SRSLTE_CP_NSYMB(cp) * SRSLTE_NRE;
}
/* if it's the prb in the middle, there are less RE due to PBCH and PSS/SSS */
if ((subframe == 0 || subframe == 5)
&& (prb_idx >= nof_prb / 2 - 3 && prb_idx < nof_prb / 2 + 3 + (nof_prb%2))) {
if (subframe == 0) {
if (slot == 0) {
re = (SRSLTE_CP_NSYMB(cp) - nof_ctrl_symbols - 2) * SRSLTE_NRE;
} else {
if (SRSLTE_CP_ISEXT(cp)) {
re = (SRSLTE_CP_NSYMB(cp) - 4) * SRSLTE_NRE;
skip_refs = true;
} else {
re = (SRSLTE_CP_NSYMB(cp) - 4) * SRSLTE_NRE + 2 * nof_ports;
}
}
} else if (subframe == 5) {
if (slot == 0) {
re = (SRSLTE_CP_NSYMB(cp) - nof_ctrl_symbols - 2) * SRSLTE_NRE;
}
}
if ((nof_prb % 2)
&& (prb_idx == nof_prb / 2 - 3 || prb_idx == nof_prb / 2 + 3)) {
if (slot == 0) {
re += 2 * SRSLTE_NRE / 2;
} else if (subframe == 0) {
re += 4 * SRSLTE_NRE / 2 - nof_ports;
if (SRSLTE_CP_ISEXT(cp)) {
re -= nof_ports > 2 ? 2 : nof_ports;
}
}
}
}
// remove references
if (!skip_refs) {
switch (nof_ports) {
case 1:
case 2:
re -= 2 * (slot + 1) * nof_ports;
break;
case 4:
if (slot == 1) {
re -= 12;
} else {
re -= 4;
if (nof_ctrl_symbols == 1) {
re -= 4;
}
}
break;
}
}
return re;
}
int srslte_ra_ul_dci_to_grant_prb_allocation(srslte_ra_ul_dci_t *dci, srslte_ra_ul_grant_t *grant, uint32_t n_rb_ho, uint32_t nof_prb)
{
bzero(grant, sizeof(srslte_ra_ul_grant_t));
grant->ncs_dmrs = dci->n_dmrs;
grant->L_prb = dci->type2_alloc.L_crb;
uint32_t n_prb_1 = dci->type2_alloc.RB_start;
uint32_t n_rb_pusch = 0;
if (n_rb_ho%2) {
n_rb_ho++;
}
if (dci->freq_hop_fl == SRSLTE_RA_PUSCH_HOP_DISABLED || dci->freq_hop_fl == SRSLTE_RA_PUSCH_HOP_TYPE2) {
/* For no freq hopping or type2 freq hopping, n_prb is the same
* n_prb_tilde is calculated during resource mapping
*/
for (uint32_t i=0;i<2;i++) {
grant->n_prb[i] = n_prb_1;
}
if (dci->freq_hop_fl == SRSLTE_RA_PUSCH_HOP_DISABLED) {
grant->freq_hopping = 0;
} else {
grant->freq_hopping = 2;
}
INFO("prb1: %d, prb2: %d, L: %d\n", grant->n_prb[0], grant->n_prb[1], grant->L_prb);
} else {
/* Type1 frequency hopping as defined in 8.4.1 of 36.213
* frequency offset between 1st and 2nd slot is fixed.
*/
n_rb_pusch = nof_prb - n_rb_ho - (nof_prb%2);
// starting prb idx for slot 0 is as given by resource grant
grant->n_prb[0] = n_prb_1;
if (n_prb_1 < n_rb_ho/2) {
fprintf(stderr, "Invalid Frequency Hopping parameters. Offset: %d, n_prb_1: %d\n", n_rb_ho, n_prb_1);
}
uint32_t n_prb_1_tilde = n_prb_1;
// prb idx for slot 1
switch(dci->freq_hop_fl) {
case SRSLTE_RA_PUSCH_HOP_QUART:
grant->n_prb[1] = (n_rb_pusch/4+ n_prb_1_tilde)%n_rb_pusch;
break;
case SRSLTE_RA_PUSCH_HOP_QUART_NEG:
if (n_prb_1 < n_rb_pusch/4) {
grant->n_prb[1] = (n_rb_pusch+ n_prb_1_tilde -n_rb_pusch/4);
} else {
grant->n_prb[1] = (n_prb_1_tilde -n_rb_pusch/4);
}
break;
case SRSLTE_RA_PUSCH_HOP_HALF:
grant->n_prb[1] = (n_rb_pusch/2+ n_prb_1_tilde)%n_rb_pusch;
break;
default:
break;
}
INFO("n_rb_pusch: %d, prb1: %d, prb2: %d, L: %d\n", n_rb_pusch, grant->n_prb[0], grant->n_prb[1], grant->L_prb);
grant->freq_hopping = 1;
}
if (grant->n_prb[0] + grant->L_prb <= nof_prb &&
grant->n_prb[1] + grant->L_prb <= nof_prb)
{
return SRSLTE_SUCCESS;
} else {
return SRSLTE_ERROR;
}
}
srslte_mod_t last_mod[8];
uint32_t last_ul_tbs_idx[8];
uint32_t last_dl_tbs[8];
uint32_t last_dl_tbs2[8];
static int ul_dci_to_grant_mcs(srslte_ra_ul_dci_t *dci, srslte_ra_ul_grant_t *grant, uint32_t harq_pid) {
int tbs = -1;
// 8.6.2 First paragraph
if (dci->mcs_idx <= 28) {
/* Table 8.6.1-1 on 36.213 */
if (dci->mcs_idx < 11) {
grant->mcs.mod = SRSLTE_MOD_QPSK;
tbs = srslte_ra_tbs_from_idx(dci->mcs_idx, grant->L_prb);
last_ul_tbs_idx[harq_pid%8] = dci->mcs_idx;
} else if (dci->mcs_idx < 21) {
grant->mcs.mod = SRSLTE_MOD_16QAM;
tbs = srslte_ra_tbs_from_idx(dci->mcs_idx-1, grant->L_prb);
last_ul_tbs_idx[harq_pid%8] = dci->mcs_idx-1;
} else if (dci->mcs_idx < 29) {
grant->mcs.mod = SRSLTE_MOD_64QAM;
tbs = srslte_ra_tbs_from_idx(dci->mcs_idx-2, grant->L_prb);
last_ul_tbs_idx[harq_pid%8] = dci->mcs_idx-2;
} else {
fprintf(stderr, "Invalid MCS index %d\n", dci->mcs_idx);
}
last_mod[harq_pid%8] = grant->mcs.mod;
} else if (dci->mcs_idx == 29 && dci->cqi_request && grant->L_prb <= 4) {
// 8.6.1 and 8.6.2 36.213 second paragraph
grant->mcs.mod = SRSLTE_MOD_QPSK;
tbs = srslte_ra_tbs_from_idx(last_ul_tbs_idx[harq_pid%8], grant->L_prb);
dci->rv_idx = 1;
} else if (dci->mcs_idx >= 29) {
// Else use last TBS/Modulation and use mcs to obtain rv_idx
tbs = srslte_ra_tbs_from_idx(last_ul_tbs_idx[harq_pid%8], grant->L_prb);
grant->mcs.mod = last_mod[harq_pid%8];
dci->rv_idx = dci->mcs_idx - 28;
DEBUG("TTI=%d, harq_pid=%d, mcs_idx=%d, tbs=%d, mod=%d, rv=%d\n",
harq_pid, harq_pid%8, dci->mcs_idx, tbs/8, grant->mcs.mod, dci->rv_idx);
}
if (tbs < 0) {
fprintf(stderr, "Error computing TBS\n");
return SRSLTE_ERROR;
} else {
grant->mcs.tbs = (uint32_t) tbs;
return SRSLTE_SUCCESS;
}
}
void srslte_ra_ul_grant_to_nbits(srslte_ra_ul_grant_t *grant, srslte_cp_t cp, uint32_t N_srs, srslte_ra_nbits_t *nbits)
{
nbits->nof_symb = 2*(SRSLTE_CP_NSYMB(cp)-1) - N_srs;
nbits->nof_re = nbits->nof_symb*grant->M_sc;
nbits->nof_bits = nbits->nof_re * grant->Qm;
}
/** Compute PRB allocation for Uplink as defined in 8.1 and 8.4 of 36.213 */
int srslte_ra_ul_dci_to_grant(srslte_ra_ul_dci_t *dci, uint32_t nof_prb, uint32_t n_rb_ho, srslte_ra_ul_grant_t *grant,
uint32_t harq_pid)
{
// Compute PRB allocation
if (!srslte_ra_ul_dci_to_grant_prb_allocation(dci, grant, n_rb_ho, nof_prb)) {
// Compute MCS
if (!ul_dci_to_grant_mcs(dci, grant, harq_pid)) {
// Fill rest of grant structure
grant->mcs.idx = dci->mcs_idx;
grant->M_sc = grant->L_prb*SRSLTE_NRE;
grant->M_sc_init = grant->M_sc; // FIXME: What should M_sc_init be?
grant->Qm = srslte_mod_bits_x_symbol(grant->mcs.mod);
} else {
fprintf(stderr, "Error computing MCS\n");
return SRSLTE_ERROR;
}
} else {
printf("Error computing UL PRB allocation\n");
return SRSLTE_ERROR;
}
return SRSLTE_SUCCESS;
}
uint32_t srslte_ra_dl_approx_nof_re(srslte_cell_t cell, uint32_t nof_prb, uint32_t nof_ctrl_symbols)
{
uint32_t nof_refs = 0;
uint32_t nof_symb = 2*SRSLTE_CP_NSYMB(cell.cp)-nof_ctrl_symbols;
switch(cell.nof_ports) {
case 1:
nof_refs = 2*3;
break;
case 2:
nof_refs = 4*3;
break;
case 4:
nof_refs = 4*4;
break;
}
return nof_prb * (nof_symb*SRSLTE_NRE-nof_refs);
}
/* Computes the number of RE for each PRB in the prb_dist structure */
uint32_t srslte_ra_dl_grant_nof_re(srslte_ra_dl_grant_t *grant, srslte_cell_t cell,
uint32_t sf_idx, uint32_t nof_ctrl_symbols)
{
uint32_t j, s;
// Compute number of RE per PRB
uint32_t nof_re = 0;
for (s = 0; s < 2; s++) {
for (j = 0; j < cell.nof_prb; j++) {
if (grant->prb_idx[s][j]) {
nof_re += ra_re_x_prb(sf_idx, s, j,
cell.nof_prb, cell.nof_ports, nof_ctrl_symbols, cell.cp);
}
}
}
return nof_re;
}
/** Compute PRB allocation for Downlink as defined in 7.1.6 of 36.213 */
int srslte_ra_dl_dci_to_grant_prb_allocation(srslte_ra_dl_dci_t *dci, srslte_ra_dl_grant_t *grant, uint32_t nof_prb) {
int i, j;
uint32_t bitmask;
uint32_t P = srslte_ra_type0_P(nof_prb);
uint32_t n_rb_rbg_subset, n_rb_type1;
bzero(grant, sizeof(srslte_ra_dl_grant_t));
switch (dci->alloc_type) {
case SRSLTE_RA_ALLOC_TYPE0:
bitmask = dci->type0_alloc.rbg_bitmask;
int nb = (int) ceilf((float) nof_prb / P);
for (i = 0; i < nb; i++) {
if (bitmask & (1 << (nb - i - 1))) {
for (j = 0; j < P; j++) {
if (i*P+j < nof_prb) {
grant->prb_idx[0][i * P + j] = true;
grant->nof_prb++;
}
}
}
}
memcpy(&grant->prb_idx[1], &grant->prb_idx[0], SRSLTE_MAX_PRB*sizeof(bool));
break;
case SRSLTE_RA_ALLOC_TYPE1:
n_rb_type1 = srslte_ra_type1_N_rb(nof_prb);
if (dci->type1_alloc.rbg_subset < (nof_prb / P) % P) {
n_rb_rbg_subset = ((nof_prb - 1) / (P * P)) * P + P;
} else if (dci->type1_alloc.rbg_subset == ((nof_prb / P) % P)) {
n_rb_rbg_subset = ((nof_prb - 1) / (P * P)) * P + ((nof_prb - 1) % P) + 1;
} else {
n_rb_rbg_subset = ((nof_prb - 1) / (P * P)) * P;
}
int shift = dci->type1_alloc.shift ? (n_rb_rbg_subset - n_rb_type1) : 0;
bitmask = dci->type1_alloc.vrb_bitmask;
for (i = 0; i < n_rb_type1; i++) {
if (bitmask & (1 << (n_rb_type1 - i - 1))) {
if ((((i + shift) / P)
* P * P + dci->type1_alloc.rbg_subset * P + (i + shift) % P) < nof_prb) {
grant->prb_idx[0][((i + shift) / P)
* P * P + dci->type1_alloc.rbg_subset * P + (i + shift) % P] = true;
grant->nof_prb++;
} else {
return SRSLTE_ERROR;
}
}
}
memcpy(&grant->prb_idx[1], &grant->prb_idx[0], SRSLTE_MAX_PRB*sizeof(bool));
break;
case SRSLTE_RA_ALLOC_TYPE2:
if (dci->type2_alloc.mode == SRSLTE_RA_TYPE2_LOC) {
for (i = 0; i < dci->type2_alloc.L_crb; i++) {
grant->prb_idx[0][i + dci->type2_alloc.RB_start] = true;
grant->nof_prb++;
}
memcpy(&grant->prb_idx[1], &grant->prb_idx[0], SRSLTE_MAX_PRB*sizeof(bool));
} else {
/* Mapping of Virtual to Physical RB for distributed type is defined in
* 6.2.3.2 of 36.211
*/
int N_gap, N_tilde_vrb, n_tilde_vrb, n_tilde_prb, n_tilde2_prb, N_null,
N_row, n_vrb;
int n_tilde_prb_odd, n_tilde_prb_even;
if (dci->type2_alloc.n_gap == SRSLTE_RA_TYPE2_NG1) {
N_tilde_vrb = srslte_ra_type2_n_vrb_dl(nof_prb, true);
N_gap = srslte_ra_type2_ngap(nof_prb, true);
} else {
N_tilde_vrb = 2 * srslte_ra_type2_n_vrb_dl(nof_prb, true);
N_gap = srslte_ra_type2_ngap(nof_prb, false);
}
N_row = (int) ceilf((float) N_tilde_vrb / (4 * P)) * P;
N_null = 4 * N_row - N_tilde_vrb;
for (i = 0; i < dci->type2_alloc.L_crb; i++) {
n_vrb = i + dci->type2_alloc.RB_start;
n_tilde_vrb = n_vrb % N_tilde_vrb;
n_tilde_prb = 2 * N_row * (n_tilde_vrb % 2) + n_tilde_vrb / 2
+ N_tilde_vrb * (n_vrb / N_tilde_vrb);
n_tilde2_prb = N_row * (n_tilde_vrb % 4) + n_tilde_vrb / 4
+ N_tilde_vrb * (n_vrb / N_tilde_vrb);
if (N_null != 0 && n_tilde_vrb >= (N_tilde_vrb - N_null)
&& (n_tilde_vrb % 2) == 1) {
n_tilde_prb_odd = n_tilde_prb - N_row;
} else if (N_null != 0 && n_tilde_vrb >= (N_tilde_vrb - N_null)
&& (n_tilde_vrb % 2) == 0) {
n_tilde_prb_odd = n_tilde_prb - N_row + N_null / 2;
} else if (N_null != 0 && n_tilde_vrb < (N_tilde_vrb - N_null)
&& (n_tilde_vrb % 4) >= 2) {
n_tilde_prb_odd = n_tilde2_prb - N_null / 2;
} else {
n_tilde_prb_odd = n_tilde2_prb;
}
n_tilde_prb_even = (n_tilde_prb_odd + N_tilde_vrb / 2) % N_tilde_vrb
+ N_tilde_vrb * (n_vrb / N_tilde_vrb);
if (n_tilde_prb_odd < N_tilde_vrb / 2) {
if (n_tilde_prb_odd < nof_prb) {
grant->prb_idx[0][n_tilde_prb_odd] = true;
} else {
return SRSLTE_ERROR;
}
} else {
if (n_tilde_prb_odd + N_gap - N_tilde_vrb / 2 < nof_prb) {
grant->prb_idx[0][n_tilde_prb_odd + N_gap - N_tilde_vrb / 2] = true;
} else {
return SRSLTE_ERROR;
}
}
grant->nof_prb++;
if (n_tilde_prb_even < N_tilde_vrb / 2) {
if(n_tilde_prb_even < nof_prb) {
grant->prb_idx[1][n_tilde_prb_even] = true;
} else {
return SRSLTE_ERROR;
}
} else {
if (n_tilde_prb_even + N_gap - N_tilde_vrb / 2 < nof_prb) {
grant->prb_idx[1][n_tilde_prb_even + N_gap - N_tilde_vrb / 2] = true;
} else {
return SRSLTE_ERROR;
}
}
}
}
break;
default:
return SRSLTE_ERROR;
}
return SRSLTE_SUCCESS;
}
static int dl_fill_ra_mcs(srslte_ra_mcs_t *mcs, uint32_t nprb) {
uint32_t i_tbs = 0;
int tbs = -1;
if (mcs->idx < 10) {
mcs->mod = SRSLTE_MOD_QPSK;
i_tbs = mcs->idx;
} else if (mcs->idx < 17) {
mcs->mod = SRSLTE_MOD_16QAM;
i_tbs = mcs->idx-1;
} else if (mcs->idx < 29) {
mcs->mod = SRSLTE_MOD_64QAM;
i_tbs = mcs->idx-2;
} else if (mcs->idx == 29) {
mcs->mod = SRSLTE_MOD_QPSK;
tbs = 0;
i_tbs = 0;
} else if (mcs->idx == 30) {
mcs->mod = SRSLTE_MOD_16QAM;
tbs = 0;
i_tbs = 0;
} else if (mcs->idx == 31) {
mcs->mod = SRSLTE_MOD_64QAM;
tbs = 0;
i_tbs = 0;
}
if (tbs == -1) {
tbs = srslte_ra_tbs_from_idx(i_tbs, nprb);
if (tbs >= 0) {
mcs->tbs = tbs;
}
}
return tbs;
}
/* Modulation order and transport block size determination 7.1.7 in 36.213 */
static int dl_dci_to_grant_mcs(srslte_ra_dl_dci_t *dci, srslte_ra_dl_grant_t *grant, bool crc_is_crnti) {
uint32_t n_prb=0;
int tbs = -1;
uint32_t i_tbs = 0;
if (!crc_is_crnti) {
if (dci->dci_is_1a) {
n_prb = dci->type2_alloc.n_prb1a == SRSLTE_RA_TYPE2_NPRB1A_2 ? 2 : 3;
i_tbs = dci->mcs_idx;
tbs = srslte_ra_tbs_from_idx(i_tbs, n_prb);
} else if (dci->dci_is_1c) {
if (dci->mcs_idx < 32) {
tbs = tbs_format1c_table[dci->mcs_idx];
} else {
fprintf(stderr, "Error decoding DCI: Invalid mcs_idx=%d in Format1C\n", dci->mcs_idx);
}
} else {
fprintf(stderr, "Error decoding DCI: P/SI/RA-RNTI supports Format1A/1C only\n");
return SRSLTE_ERROR;
}
grant->mcs.mod = SRSLTE_MOD_QPSK;
grant->mcs.tbs = (uint32_t) tbs;
} else {
n_prb = grant->nof_prb;
grant->nof_tb = 0;
if (dci->tb_en[0]) {
grant->mcs.idx = dci->mcs_idx;
tbs = dl_fill_ra_mcs(&grant->mcs, n_prb);
if (tbs) {
last_dl_tbs[dci->harq_process%8] = tbs;
} else {
// For mcs>=29, set last TBS received for this PID
grant->mcs.tbs = last_dl_tbs[dci->harq_process%8];
}
grant->nof_tb++;
} else {
grant->mcs.tbs = 0;
}
if (dci->tb_en[1]) {
grant->mcs2.idx = dci->mcs_idx_1;
tbs = dl_fill_ra_mcs(&grant->mcs2, n_prb);
if (tbs) {
last_dl_tbs2[dci->harq_process%8] = tbs;
} else {
// For mcs>=29, set last TBS received for this PID
grant->mcs2.tbs = last_dl_tbs2[dci->harq_process%8];
}
grant->nof_tb++;
} else {
grant->mcs2.tbs = 0;
}
}
if (dci->tb_en[0]) {
grant->Qm = srslte_mod_bits_x_symbol(grant->mcs.mod);
}
if (dci->tb_en[1]) {
grant->Qm2 = srslte_mod_bits_x_symbol(grant->mcs2.mod);
}
if (tbs < 0) {
return SRSLTE_ERROR;
} else {
return SRSLTE_SUCCESS;
}
}
void srslte_ra_dl_grant_to_nbits(srslte_ra_dl_grant_t *grant, uint32_t cfi, srslte_cell_t cell, uint32_t sf_idx, srslte_ra_nbits_t *nbits)
{
// Compute number of RE
nbits->nof_re = srslte_ra_dl_grant_nof_re(grant, cell, sf_idx, cell.nof_prb<10?(cfi+1):cfi);
nbits->lstart = cell.nof_prb<10?(cfi+1):cfi;
nbits->nof_symb = 2*SRSLTE_CP_NSYMB(cell.cp)-nbits->lstart;
nbits->nof_bits = nbits->nof_re * grant->Qm;
}
/** Obtains a DL grant from a DCI grant for PDSCH */
int srslte_ra_dl_dci_to_grant(srslte_ra_dl_dci_t *dci,
uint32_t nof_prb, uint16_t msg_rnti, srslte_ra_dl_grant_t *grant)
{
bool crc_is_crnti = false;
if (msg_rnti >= SRSLTE_CRNTI_START && msg_rnti <= SRSLTE_CRNTI_END) {
crc_is_crnti = true;
}
// Compute PRB allocation
if (!srslte_ra_dl_dci_to_grant_prb_allocation(dci, grant, nof_prb)) {
// Compute MCS
if (!dl_dci_to_grant_mcs(dci, grant, crc_is_crnti)) {
// Apply Section 7.1.7.3. If RA-RNTI and Format1C rv_idx=0
if (msg_rnti >= SRSLTE_RARNTI_START && msg_rnti <= SRSLTE_RARNTI_END &&
dci->dci_is_1c)
{
dci->rv_idx = 0;
}
} else {
return SRSLTE_ERROR;
}
} else {
return SRSLTE_ERROR;
}
return SRSLTE_SUCCESS;
}
/* RBG size for type0 scheduling as in table 7.1.6.1-1 of 36.213 */
uint32_t srslte_ra_type0_P(uint32_t nof_prb) {
if (nof_prb <= 10) {
return 1;
} else if (nof_prb <= 26) {
return 2;
} else if (nof_prb <= 63) {
return 3;
} else {
return 4;
}
}
/* Returns N_rb_type1 according to section 7.1.6.2 */
uint32_t srslte_ra_type1_N_rb(uint32_t nof_prb) {
uint32_t P = srslte_ra_type0_P(nof_prb);
return (uint32_t) ceilf((float) nof_prb / P) - (uint32_t) ceilf(log2f((float) P)) - 1;
}
/* Convert Type2 scheduling L_crb and RB_start to RIV value */
uint32_t srslte_ra_type2_to_riv(uint32_t L_crb, uint32_t RB_start, uint32_t nof_prb) {
uint32_t riv;
if (L_crb <= nof_prb / 2) {
riv = nof_prb * (L_crb - 1) + RB_start;
} else {
riv = nof_prb * (nof_prb - L_crb + 1) + nof_prb - 1 - RB_start;
}
return riv;
}
/* Convert Type2 scheduling RIV value to L_crb and RB_start values */
void srslte_ra_type2_from_riv(uint32_t riv, uint32_t *L_crb, uint32_t *RB_start,
uint32_t nof_prb, uint32_t nof_vrb) {
*L_crb = (uint32_t) (riv / nof_prb) + 1;
*RB_start = (uint32_t) (riv % nof_prb);
if (*L_crb > nof_vrb - *RB_start) {
*L_crb = nof_prb - (int) (riv / nof_prb) + 1;
*RB_start = nof_prb - riv % nof_prb - 1;
}
}
/* Table 6.2.3.2-1 in 36.211 */
uint32_t srslte_ra_type2_ngap(uint32_t nof_prb, bool ngap_is_1) {
if (nof_prb <= 10) {
return nof_prb / 2;
} else if (nof_prb == 11) {
return 4;
} else if (nof_prb <= 19) {
return 8;
} else if (nof_prb <= 26) {
return 12;
} else if (nof_prb <= 44) {
return 18;
} else if (nof_prb <= 49) {
return 27;
} else if (nof_prb <= 63) {
return ngap_is_1 ? 27 : 9;
} else if (nof_prb <= 79) {
return ngap_is_1 ? 32 : 16;
} else {
return ngap_is_1 ? 48 : 16;
}
}
/* Table 7.1.6.3-1 in 36.213 */
uint32_t srslte_ra_type2_n_rb_step(uint32_t nof_prb) {
if (nof_prb < 50) {
return 2;
} else {
return 4;
}
}
/* as defined in 6.2.3.2 of 36.211 */
uint32_t srslte_ra_type2_n_vrb_dl(uint32_t nof_prb, bool ngap_is_1) {
uint32_t ngap = srslte_ra_type2_ngap(nof_prb, ngap_is_1);
if (ngap_is_1) {
return 2 * (ngap < (nof_prb - ngap) ? ngap : nof_prb - ngap);
} else {
return ((uint32_t) nof_prb / ngap) * 2 * ngap;
}
}
/* Modulation and TBS index table for PDSCH from 3GPP TS 36.213 v10.3.0 table 7.1.7.1-1 */
int srslte_ra_tbs_idx_from_mcs(uint32_t mcs) {
if(mcs < 29) {
return mcs_tbs_idx_table[mcs];
} else {
return SRSLTE_ERROR;
}
}
srslte_mod_t srslte_ra_mod_from_mcs(uint32_t mcs) {
if (mcs <= 10 || mcs == 29) {
return SRSLTE_MOD_QPSK;
} else if (mcs <= 17 || mcs == 30) {
return SRSLTE_MOD_16QAM;
} else {
return SRSLTE_MOD_64QAM;
}
}
int srslte_ra_mcs_from_tbs_idx(uint32_t tbs_idx) {
for (int i=0;i<29;i++) {
if (tbs_idx == mcs_tbs_idx_table[i]) {
return i;
}
}
return SRSLTE_ERROR;
}
/* Table 7.1.7.2.1-1: Transport block size table on 36.213 */
int srslte_ra_tbs_from_idx(uint32_t tbs_idx, uint32_t n_prb) {
if (tbs_idx < 27 && n_prb > 0 && n_prb <= SRSLTE_MAX_PRB) {
return tbs_table[tbs_idx][n_prb - 1];
} else {
return SRSLTE_ERROR;
}
}
/* Returns lowest nearest index of TBS value in table 7.1.7.2 on 36.213
* or -1 if the TBS value is not within the valid TBS values
*/
int srslte_ra_tbs_to_table_idx(uint32_t tbs, uint32_t n_prb) {
uint32_t idx;
if (n_prb > 0 && n_prb <= SRSLTE_MAX_PRB) {
if (tbs <= tbs_table[0][n_prb-1]) {
return 0;
}
if (tbs >= tbs_table[26][n_prb-1]) {
return 27;
}
for (idx = 0; idx < 26; idx++) {
if (tbs_table[idx][n_prb-1] <= tbs && tbs_table[idx+1][n_prb-1] >= tbs) {
return idx+1;
}
}
}
return SRSLTE_ERROR;
}
void srslte_ra_pusch_fprint(FILE *f, srslte_ra_ul_dci_t *dci, uint32_t nof_prb) {
fprintf(f, " - Resource Allocation Type 2 mode :\t%s\n",
dci->type2_alloc.mode == SRSLTE_RA_TYPE2_LOC ? "Localized" : "Distributed");
fprintf(f, " + Frequency Hopping:\t\t\t");
if (dci->freq_hop_fl == SRSLTE_RA_PUSCH_HOP_DISABLED) {
fprintf(f, "No\n");
} else {
fprintf(f, "Yes\n");
}
fprintf(f, " + Resource Indicator Value:\t\t%d\n", dci->type2_alloc.riv);
if (dci->type2_alloc.mode == SRSLTE_RA_TYPE2_LOC) {
fprintf(f, " + VRB Assignment:\t\t\t%d VRB starting with VRB %d\n",
dci->type2_alloc.L_crb, dci->type2_alloc.RB_start);
} else {
fprintf(f, " + VRB Assignment:\t\t\t%d VRB starting with VRB %d\n",
dci->type2_alloc.L_crb, dci->type2_alloc.RB_start);
fprintf(f, " + VRB gap selection:\t\t\tGap %d\n",
dci->type2_alloc.n_gap == SRSLTE_RA_TYPE2_NG1 ? 1 : 2);
fprintf(f, " + VRB gap:\t\t\t\t%d\n",
srslte_ra_type2_ngap(nof_prb, dci->type2_alloc.n_gap == SRSLTE_RA_TYPE2_NG1));
}
fprintf(f, " - Modulation and coding scheme index:\t%d\n", dci->mcs_idx);
fprintf(f, " - New data indicator:\t\t\t%s\n", dci->ndi ? "Yes" : "No");
fprintf(f, " - Redundancy version:\t\t\t%d\n", dci->rv_idx);
fprintf(f, " - TPC command for PUCCH:\t\t--\n");
}
void srslte_ra_ul_grant_fprint(FILE *f, srslte_ra_ul_grant_t *grant) {
fprintf(f, " - Number of PRBs:\t\t\t%d\n", grant->L_prb);
fprintf(f, " - Modulation type:\t\t\t%s\n", srslte_mod_string(grant->mcs.mod));
fprintf(f, " - Transport block size:\t\t%d\n", grant->mcs.tbs);
}
char *ra_type_string(srslte_ra_type_t alloc_type) {
switch (alloc_type) {
case SRSLTE_RA_ALLOC_TYPE0:
return "Type 0";
case SRSLTE_RA_ALLOC_TYPE1:
return "Type 1";
case SRSLTE_RA_ALLOC_TYPE2:
return "Type 2";
default:
return "N/A";
}
}
void srslte_ra_pdsch_fprint(FILE *f, srslte_ra_dl_dci_t *dci, uint32_t nof_prb) {
fprintf(f, " - Resource Allocation Type:\t\t%s\n",
ra_type_string(dci->alloc_type));
switch (dci->alloc_type) {
case SRSLTE_RA_ALLOC_TYPE0:
fprintf(f, " + Resource Block Group Size:\t\t%d\n", srslte_ra_type0_P(nof_prb));
fprintf(f, " + RBG Bitmap:\t\t\t0x%x\n", dci->type0_alloc.rbg_bitmask);
break;
case SRSLTE_RA_ALLOC_TYPE1:
fprintf(f, " + Resource Block Group Size:\t\t%d\n", srslte_ra_type0_P(nof_prb));
fprintf(f, " + RBG Bitmap:\t\t\t0x%x\n", dci->type1_alloc.vrb_bitmask);
fprintf(f, " + RBG Subset:\t\t\t%d\n", dci->type1_alloc.rbg_subset);
fprintf(f, " + RBG Shift:\t\t\t\t%s\n",
dci->type1_alloc.shift ? "Yes" : "No");
break;
case SRSLTE_RA_ALLOC_TYPE2:
fprintf(f, " + Type:\t\t\t\t%s\n",
dci->type2_alloc.mode == SRSLTE_RA_TYPE2_LOC ? "Localized" : "Distributed");
fprintf(f, " + Resource Indicator Value:\t\t%d\n", dci->type2_alloc.riv);
if (dci->type2_alloc.mode == SRSLTE_RA_TYPE2_LOC) {
fprintf(f, " + VRB Assignment:\t\t\t%d VRB starting with VRB %d\n",
dci->type2_alloc.L_crb, dci->type2_alloc.RB_start);
} else {
fprintf(f, " + VRB Assignment:\t\t\t%d VRB starting with VRB %d\n",
dci->type2_alloc.L_crb, dci->type2_alloc.RB_start);
fprintf(f, " + VRB gap selection:\t\t\tGap %d\n",
dci->type2_alloc.n_gap == SRSLTE_RA_TYPE2_NG1 ? 1 : 2);
fprintf(f, " + VRB gap:\t\t\t\t%d\n",
srslte_ra_type2_ngap(nof_prb, dci->type2_alloc.n_gap == SRSLTE_RA_TYPE2_NG1));
}
break;
}
fprintf(f, " - Modulation and coding scheme index:\t%d\n", dci->mcs_idx);
fprintf(f, " - HARQ process:\t\t\t%d\n", dci->harq_process);
fprintf(f, " - New data indicator:\t\t\t%s\n", dci->ndi ? "Yes" : "No");
fprintf(f, " - Redundancy version:\t\t\t%d\n", dci->rv_idx);
fprintf(f, " - TPC command for PUCCH:\t\t--\n");
}
void srslte_ra_dl_grant_fprint(FILE *f, srslte_ra_dl_grant_t *grant) {
srslte_ra_prb_fprint(f, grant);
fprintf(f, " - Number of PRBs:\t\t\t%d\n", grant->nof_prb);
fprintf(f, " - Modulation type:\t\t\t%s\n", srslte_mod_string(grant->mcs.mod));
fprintf(f, " - Transport block size:\t\t%d\n", grant->mcs.tbs);
}
void srslte_ra_prb_fprint(FILE *f, srslte_ra_dl_grant_t *grant) {
if (grant->nof_prb > 0) {
for (int j=0;j<2;j++) {
fprintf(f, " - PRB Bitmap Assignment %dst slot:\n", j);
for (int i=0;i<SRSLTE_MAX_PRB;i++) {
if (grant->prb_idx[j][i]) {
fprintf(f, "%d, ", i);
}
}
fprintf(f, "\n");
}
}
}
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