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Implemented NR DL SCH decoder and unit test

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master
Xavier Arteaga 4 years ago committed by Andre Puschmann
parent 3464dd3c0d
commit 2aa7e43771
6 changed files with 434 additions and 245 deletions
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2
lib/include/srslte/phy/phch/ra_nr.h
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@ -47,7 +47,7 @@ typedef struct SRSLTE_API {
int tbs; ///< Payload size, TS 38.212 refers to it as A int tbs; ///< Payload size, TS 38.212 refers to it as A
double R; ///< Target LDPC rate double R; ///< Target LDPC rate
int rv; int rv;
uint32_t nof_bits; uint32_t nof_bits; ///< Number of available bits to send, known as G
uint32_t cw_idx; uint32_t cw_idx;
bool enabled; bool enabled;

106
lib/include/srslte/phy/phch/sch_nr.h
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@ -39,11 +39,15 @@
#include "srslte/phy/phch/pdsch_cfg_nr.h" #include "srslte/phy/phch/pdsch_cfg_nr.h"
#include "srslte/phy/phch/ra_nr.h" #include "srslte/phy/phch/ra_nr.h"
#define SRSLTE_SCH_NR_MAX_NOF_CB_LDPC \
(SRSLTE_MAX_PRB_NR * SRSLTE_NRE * 8 * SRSLTE_NSYMB_PER_SLOT_NR * (SRSLTE_LDPC_BG2_MAX_LEN_CB + 1) / \
SRSLTE_LDPC_BG2_MAX_LEN_CB)
typedef struct SRSLTE_API { typedef struct SRSLTE_API {
srslte_carrier_nr_t carrier; srslte_carrier_nr_t carrier;
/// Temporal data buffers /// Temporal data buffers
uint8_t* cb_in; uint8_t* temp_cb;
/// CRC generators /// CRC generators
srslte_crc_t crc_tb_24; srslte_crc_t crc_tb_24;
@ -51,12 +55,17 @@ typedef struct SRSLTE_API {
srslte_crc_t crc_cb; srslte_crc_t crc_cb;
/// LDPC encoders /// LDPC encoders
srslte_ldpc_encoder_t* encoder_bg1[MAX_LIFTSIZE]; srslte_ldpc_encoder_t* encoder_bg1[MAX_LIFTSIZE + 1];
srslte_ldpc_encoder_t* encoder_bg2[MAX_LIFTSIZE]; srslte_ldpc_encoder_t* encoder_bg2[MAX_LIFTSIZE + 1];
/// LDPC decoders
srslte_ldpc_decoder_t* decoder_bg1[MAX_LIFTSIZE + 1];
srslte_ldpc_decoder_t* decoder_bg2[MAX_LIFTSIZE + 1];
/// LDPC Rate matcher /// LDPC Rate matcher
srslte_ldpc_rm_t rm; srslte_ldpc_rm_t tx_rm;
} srslte_sch_nr_encoder_t; srslte_ldpc_rm_t rx_rm;
} srslte_sch_nr_t;
typedef struct SRSLTE_API { typedef struct SRSLTE_API {
bool disable_simd; bool disable_simd;
@ -64,50 +73,77 @@ typedef struct SRSLTE_API {
float scaling_factor; float scaling_factor;
} srslte_sch_nr_decoder_cfg_t; } srslte_sch_nr_decoder_cfg_t;
typedef struct SRSLTE_API { /**
/// CRC generators * @brief Common SCH configuration
srslte_crc_t crc_tb_24; */
srslte_crc_t crc_tb_16; typedef struct {
srslte_crc_t crc_cb; srslte_basegraph_t bg; ///< @brief Base graph
uint32_t Qm; ///< @brief Modulation order
/// LDPC decoders uint32_t G; ///< Number of available bits
srslte_ldpc_decoder_t* decoder_bg1[MAX_LIFTSIZE]; uint32_t A; ///< @brief Payload size, TBS
srslte_ldpc_decoder_t* decoder_bg2[MAX_LIFTSIZE]; uint32_t L_tb; ///< @brief the number of the transport block parity bits (16 or 24 bits)
uint32_t L_cb; ///< @brief the number of the code block parity bits (0 or 24 bits)
uint32_t B; ///< @brief the number of bits in the transport block including TB CRC
uint32_t Bp; ///< @brief the number of bits in the transport block including CB and TB CRCs
uint32_t Kp; ///< @brief Number of payload bits of the code block including CB CRC
uint32_t Kr; ///< @brief Number of payload bits of the code block including CB CRC and filler bits
uint32_t F; ///< @brief Number of filler bits
uint32_t Nref; ///< @brief N_ref parameter described in TS 38.212 V15.9.0 5.4.2.1
uint32_t Z; ///< @brief LDPC lifting size
uint32_t Nl; ///< @brief Number of transmission layers that the transport block is mapped onto
bool mask[SRSLTE_SCH_NR_MAX_NOF_CB_LDPC]; ///< Indicates what codeblocks shall be encoded/decoded
uint32_t C; ///< Number of codeblocks
uint32_t Cp; ///< Number of codeblocks that are actually transmitted
srslte_crc_t* crc_tb; ///< Selected CRC for transport block
srslte_ldpc_encoder_t* encoder; ///< @brief Points to the selected encoder (if valid)
srslte_ldpc_decoder_t* decoder; ///< @brief Points to the selected decoder (if valid)
} srslte_sch_nr_common_cfg_t;
/// LDPC Tx/Rx Rate matcher /**
srslte_ldpc_rm_t rm; * @brief Base graph selection from a provided transport block size and target rate
} srslte_sch_nr_decoder_t; *
* @remark Defined for DL-SCH in TS 38.212 V15.9.0 section 7.2.2 LDPC base graph selection
* @remark Defined for UL-SCH in TS 38.212 V15.9.0 section 6.2.2 LDPC base graph selection
*
* @param tbs the payload size as described in Clause 7.2.1 for DL-SCH and 6.2.1 for UL-SCH.
* @param R Target rate
* @return it returns the selected base graph
*/
SRSLTE_API srslte_basegraph_t srslte_sch_nr_select_basegraph(uint32_t tbs, double R);
/** /**
* @brief Initialises shared channel encoder * @brief Calculates all the parameters required for performing TS 38.212 V15.9.0 5.4 General procedures for LDPC
* @param q * @param pdsch_cfg Provides higher layers configuration
* @param tb Provides transport block configuration
* @param cfg SCH object
* @return * @return
*/ */
SRSLTE_API int srslte_sch_nr_encoder_init(srslte_sch_nr_encoder_t* q); SRSLTE_API int srslte_dlsch_nr_fill_cfg(srslte_sch_nr_t* q,
const srslte_pdsch_cfg_nr_t* pdsch_cfg,
const srslte_ra_tb_nr_t* tb,
srslte_sch_nr_common_cfg_t* cfg);
SRSLTE_API int srslte_sch_nr_init_tx(srslte_sch_nr_t* q);
SRSLTE_API int srslte_sch_nr_init_rx(srslte_sch_nr_t* q, const srslte_sch_nr_decoder_cfg_t* cfg);
SRSLTE_API int srslte_sch_nr_set_carrier(srslte_sch_nr_t* q, const srslte_carrier_nr_t* carrier);
SRSLTE_API int srslte_sch_nr_encoder_set_carrier(srslte_sch_nr_encoder_t* q, const srslte_carrier_nr_t* carrier); SRSLTE_API void srslte_sch_nr_free(srslte_sch_nr_t* q);
SRSLTE_API int srslte_dlsch_nr_encode(srslte_sch_nr_encoder_t* q, SRSLTE_API int srslte_dlsch_nr_encode(srslte_sch_nr_t* q,
const srslte_pdsch_cfg_nr_t* cfg, const srslte_pdsch_cfg_nr_t* cfg,
const srslte_ra_tb_nr_t* tb, const srslte_ra_tb_nr_t* tb,
const uint8_t* data, const uint8_t* data,
uint8_t* e_bits); uint8_t* e_bits);
SRSLTE_API void srslte_sch_nr_encoder_free(srslte_sch_nr_encoder_t* q); SRSLTE_API int srslte_sch_nr_decoder_set_carrier(srslte_sch_nr_t* q, const srslte_carrier_nr_t* carrier);
/** SRSLTE_API int srslte_dlsch_nr_decode(srslte_sch_nr_t* q,
* @brief Initialises shared channel decoder
* @param q
* @return
*/
SRSLTE_API int srslte_sch_nr_init_decoder(srslte_sch_nr_decoder_t* q, const srslte_sch_nr_decoder_cfg_t* cfg);
SRSLTE_API int srslte_dlsch_nr_decode(srslte_sch_nr_decoder_t* q,
const srslte_pdsch_cfg_nr_t* cfg, const srslte_pdsch_cfg_nr_t* cfg,
const srslte_pdsch_grant_nr_t* grant, const srslte_ra_tb_nr_t* tb,
int8_t* e_bits, int8_t* e_bits,
uint8_t* data); uint8_t* data,
bool* crc_ok);
SRSLTE_API void srslte_sch_nr_decoder_free(srslte_sch_nr_decoder_t* q);
#endif // SRSLTE_SCH_NR_H #endif // SRSLTE_SCH_NR_H

2
lib/src/phy/fec/cbsegm.c
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@ -165,7 +165,7 @@ static int cbsegm_ldpc_select_ls(uint32_t Kp, uint32_t K_b, uint32_t* Z_c, uint8
} }
// Iterate from the minimum required lift size to the maximum value // Iterate from the minimum required lift size to the maximum value
for (uint16_t Z = Kp / K_b; Z < MAX_LIFTSIZE; Z++) { for (uint16_t Z = Kp / K_b; Z <= MAX_LIFTSIZE; Z++) {
// Get index for a selected lifting size // Get index for a selected lifting size
uint8_t i = get_ls_index(Z); uint8_t i = get_ls_index(Z);

3
lib/src/phy/phch/ra_nr.c
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@ -375,5 +375,8 @@ int srslte_ra_nr_fill_tb(const srslte_pdsch_cfg_nr_t* pdsch_cfg,
tb->mod = m; tb->mod = m;
tb->nof_bits = N_re * Qm * grant->nof_layers; tb->nof_bits = N_re * Qm * grant->nof_layers;
// Calculate number of layers accordingly
tb->N_L = grant->nof_layers;
return SRSLTE_SUCCESS; return SRSLTE_SUCCESS;
} }

533
lib/src/phy/phch/sch_nr.c
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@ -27,11 +27,141 @@
#include "srslte/phy/utils/bit.h" #include "srslte/phy/utils/bit.h"
#include "srslte/phy/utils/debug.h" #include "srslte/phy/utils/debug.h"
#include "srslte/phy/utils/vector.h" #include "srslte/phy/utils/vector.h"
#include <stdint.h>
#include <stdlib.h>
#include <strings.h>
int srslte_sch_nr_encoder_init(srslte_sch_nr_encoder_t* q) srslte_basegraph_t srslte_sch_nr_select_basegraph(uint32_t tbs, double R)
{
// if A ≤ 292 , or if A ≤ 3824 and R ≤ 0.67 , or if R ≤ 0 . 25 , LDPC base graph 2 is used;
// otherwise, LDPC base graph 1 is used
srslte_basegraph_t bg = BG1;
if ((tbs <= 292) || (tbs <= 292 && R <= 0.67) || (R <= 0.25)) {
bg = BG2;
}
return bg;
}
/**
* Implementation of TS 38.212 V15.9.0 Table 5.4.2.1-1: Value of n_prb_lbrm
* @param nof_prb Maximum number of PRBs across all configured DL BWPs and UL BWPs of a carrier for DL-SCH and UL-SCH,
* respectively
* @return It returns n_prb_lbrm
*/
uint32_t sch_nr_n_prb_lbrm(uint32_t nof_prb)
{
if (nof_prb < 33) {
return 32;
}
if (nof_prb <= 66) {
return 32;
}
if (nof_prb <= 107) {
return 107;
}
if (nof_prb <= 135) {
return 135;
}
if (nof_prb <= 162) {
return 162;
}
if (nof_prb <= 217) {
return 217;
}
return 273;
}
int srslte_dlsch_nr_fill_cfg(srslte_sch_nr_t* q,
const srslte_pdsch_cfg_nr_t* pdsch_cfg,
const srslte_ra_tb_nr_t* tb,
srslte_sch_nr_common_cfg_t* cfg)
{
if (!pdsch_cfg || !tb || !cfg) {
return SRSLTE_ERROR_INVALID_INPUTS;
}
// LDPC base graph selection
srslte_basegraph_t bg = srslte_sch_nr_select_basegraph(tb->tbs, tb->R);
// Compute code block segmentation
srslte_cbsegm_t cbsegm = {};
if (cfg->bg == BG1) {
if (srslte_cbsegm_ldpc_bg1(&cbsegm, tb->tbs) != SRSLTE_SUCCESS) {
ERROR("Error: calculating LDPC BG1 code block segmentation for tbs=%d\n", tb->tbs);
return SRSLTE_ERROR;
}
} else {
if (srslte_cbsegm_ldpc_bg2(&cbsegm, tb->tbs) != SRSLTE_SUCCESS) {
ERROR("Error: calculating LDPC BG1 code block segmentation for tbs=%d\n", tb->tbs);
return SRSLTE_ERROR;
}
}
if (cbsegm.Z > MAX_LIFTSIZE) {
ERROR("Error: lifting size Z=%d is out-of-range maximum is %d\n", cbsegm.Z, MAX_LIFTSIZE);
return SRSLTE_ERROR;
}
cfg->bg = bg;
cfg->Qm = srslte_mod_bits_x_symbol(tb->mod);
cfg->A = tb->tbs;
cfg->L_tb = cbsegm.L_tb;
cfg->L_cb = cbsegm.L_cb;
cfg->B = cbsegm.tbs + cbsegm.L_tb;
cfg->Bp = cfg->B + cbsegm.L_cb * cbsegm.C;
cfg->Kp = cfg->Bp / cbsegm.C;
cfg->Kr = cbsegm.K1;
cfg->F = cfg->Kr - cfg->Kp;
cfg->Z = cbsegm.Z;
cfg->G = tb->nof_bits;
cfg->Nl = tb->N_L;
// Calculate Nref
uint32_t N_re_lbrm = 156 * sch_nr_n_prb_lbrm(q->carrier.nof_prb);
double R_lbrm = 948.0 / 1024.0;
uint32_t Qm_lbrm = (pdsch_cfg->mcs_table == srslte_mcs_table_256qam) ? 8 : 6;
uint32_t TBS_LRBM = srslte_ra_nr_tbs(N_re_lbrm, 1.0, R_lbrm, Qm_lbrm, pdsch_cfg->serving_cell_cfg.max_mimo_layers);
cfg->Nref = ceil(TBS_LRBM / (cbsegm.C * 2.0 / 3.0));
// Calculate number of code blocks after applying CBGTI... not implemented, activate all CB
for (uint32_t r = 0; r < cbsegm.C; r++) {
cfg->mask[r] = true;
}
for (uint32_t r = cbsegm.C; r < SRSLTE_SCH_NR_MAX_NOF_CB_LDPC; r++) {
cfg->mask[r] = false;
}
cfg->C = cbsegm.C;
cfg->Cp = cbsegm.C;
// Select encoder
cfg->encoder = (bg == BG1) ? q->encoder_bg1[cfg->Z] : q->encoder_bg2[cfg->Z];
// Select decoder
cfg->decoder = (bg == BG1) ? q->decoder_bg1[cfg->Z] : q->decoder_bg2[cfg->Z];
// Select CRC for TB
cfg->crc_tb = (cbsegm.L_tb == 24) ? &q->crc_tb_24 : &q->crc_tb_16;
return SRSLTE_SUCCESS;
}
#define CEIL(NUM, DEN) (((NUM) + ((DEN)-1)) / (DEN))
#define MOD(NUM, DEN) ((NUM) % (DEN))
static inline uint32_t sch_nr_get_E(const srslte_sch_nr_common_cfg_t* cfg, uint32_t j)
{
if (cfg->Nl == 0 || cfg->Qm == 0 || cfg->Cp == 0) {
ERROR("Invalid Nl (%d), Qm (%d) or Cp (%d)\n", cfg->Nl, cfg->Qm, cfg->Cp);
return 0;
}
if (j <= (cfg->Cp - MOD(cfg->G / (cfg->Nl * cfg->Qm), cfg->Cp) - 1)) {
return cfg->Nl * cfg->Qm * (cfg->G / (cfg->Nl * cfg->Qm * cfg->Cp));
}
return cfg->Nl * cfg->Qm * CEIL(cfg->G, cfg->Nl * cfg->Qm * cfg->Cp);
}
static inline int sch_nr_init_common(srslte_sch_nr_t* q)
{ {
if (q == NULL) { if (q == NULL) {
return SRSLTE_ERROR_INVALID_INPUTS; return SRSLTE_ERROR_INVALID_INPUTS;
@ -49,10 +179,22 @@ int srslte_sch_nr_encoder_init(srslte_sch_nr_encoder_t* q)
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
q->cb_in = srslte_vec_u8_malloc(SRSLTE_LDPC_MAX_LEN_CB); if (!q->temp_cb) {
if (!q->cb_in) { q->temp_cb = srslte_vec_u8_malloc(SRSLTE_LDPC_MAX_LEN_CB);
if (!q->temp_cb) {
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
}
return SRSLTE_SUCCESS;
}
int srslte_sch_nr_init_tx(srslte_sch_nr_t* q)
{
int ret = sch_nr_init_common(q);
if (ret < SRSLTE_SUCCESS) {
return ret;
}
#ifdef LV_HAVE_AVX2 #ifdef LV_HAVE_AVX2
srslte_ldpc_encoder_type_t encoder_type = SRSLTE_LDPC_ENCODER_AVX2; srslte_ldpc_encoder_type_t encoder_type = SRSLTE_LDPC_ENCODER_AVX2;
@ -61,7 +203,7 @@ int srslte_sch_nr_encoder_init(srslte_sch_nr_encoder_t* q)
#endif // LV_HAVE_AVX2 #endif // LV_HAVE_AVX2
// Iterate over all possible lifting sizes // Iterate over all possible lifting sizes
for (uint16_t ls = 0; ls < MAX_LIFTSIZE; ls++) { for (uint16_t ls = 0; ls <= MAX_LIFTSIZE; ls++) {
uint8_t ls_index = get_ls_index(ls); uint8_t ls_index = get_ls_index(ls);
// Invalid lifting size // Invalid lifting size
@ -93,36 +235,19 @@ int srslte_sch_nr_encoder_init(srslte_sch_nr_encoder_t* q)
} }
} }
return SRSLTE_SUCCESS; if (srslte_ldpc_rm_tx_init(&q->tx_rm) < SRSLTE_SUCCESS) {
} ERROR("Error: initialising Tx LDPC Rate matching\n");
return SRSLTE_ERROR;
int srslte_sch_nr_encoder_set_carrier(srslte_sch_nr_encoder_t* q, const srslte_carrier_nr_t* carrier)
{
if (!q) {
return SRSLTE_ERROR_INVALID_INPUTS;
} }
q->carrier = *carrier;
return SRSLTE_SUCCESS; return SRSLTE_SUCCESS;
} }
int srslte_sch_nr_decoder_init(srslte_sch_nr_decoder_t* q, const srslte_sch_nr_decoder_cfg_t* decoder_cfg) int srslte_sch_nr_init_rx(srslte_sch_nr_t* q, const srslte_sch_nr_decoder_cfg_t* decoder_cfg)
{ {
if (q == NULL) { int ret = sch_nr_init_common(q);
return SRSLTE_ERROR_INVALID_INPUTS; if (ret < SRSLTE_SUCCESS) {
} return ret;
if (srslte_crc_init(&q->crc_tb_24, SRSLTE_LTE_CRC24A, 24) < SRSLTE_SUCCESS) {
return SRSLTE_ERROR;
}
if (srslte_crc_init(&q->crc_cb, SRSLTE_LTE_CRC24B, 24) < SRSLTE_SUCCESS) {
return SRSLTE_ERROR;
}
if (srslte_crc_init(&q->crc_tb_16, SRSLTE_LTE_CRC16, 16) < SRSLTE_SUCCESS) {
return SRSLTE_ERROR;
} }
srslte_ldpc_decoder_type_t decoder_type = SRSLTE_LDPC_DECODER_C; srslte_ldpc_decoder_type_t decoder_type = SRSLTE_LDPC_DECODER_C;
@ -147,7 +272,7 @@ int srslte_sch_nr_decoder_init(srslte_sch_nr_decoder_t* q, const srslte_sch_nr_d
float scaling_factor = isnormal(decoder_cfg->scaling_factor) ? decoder_cfg->scaling_factor : 0.75f; float scaling_factor = isnormal(decoder_cfg->scaling_factor) ? decoder_cfg->scaling_factor : 0.75f;
// Iterate over all possible lifting sizes // Iterate over all possible lifting sizes
for (uint16_t ls = 0; ls < MAX_LIFTSIZE; ls++) { for (uint16_t ls = 0; ls <= MAX_LIFTSIZE; ls++) {
uint8_t ls_index = get_ls_index(ls); uint8_t ls_index = get_ls_index(ls);
// Invalid lifting size // Invalid lifting size
@ -180,251 +305,269 @@ int srslte_sch_nr_decoder_init(srslte_sch_nr_decoder_t* q, const srslte_sch_nr_d
} }
} }
if (srslte_ldpc_rm_rx_init_c(&q->rx_rm) < SRSLTE_SUCCESS) {
ERROR("Error: initialising Rx LDPC Rate matching\n");
return SRSLTE_ERROR;
}
return SRSLTE_SUCCESS; return SRSLTE_SUCCESS;
} }
int srslte_(srslte_sch_nr_encoder_t* q) int srslte_sch_nr_set_carrier(srslte_sch_nr_t* q, const srslte_carrier_nr_t* carrier)
{ {
if (q == NULL) { if (!q) {
return SRSLTE_ERROR_INVALID_INPUTS; return SRSLTE_ERROR_INVALID_INPUTS;
} }
if (srslte_crc_init(&q->crc_tb_24, SRSLTE_LTE_CRC24A, 24) < SRSLTE_SUCCESS) { q->carrier = *carrier;
return SRSLTE_ERROR;
}
if (srslte_crc_init(&q->crc_cb, SRSLTE_LTE_CRC24B, 24) < SRSLTE_SUCCESS) { return SRSLTE_SUCCESS;
return SRSLTE_ERROR;
} }
if (srslte_crc_init(&q->crc_tb_16, SRSLTE_LTE_CRC16, 16) < SRSLTE_SUCCESS) { void srslte_sch_nr_free(srslte_sch_nr_t* q)
return SRSLTE_ERROR; {
// Protect pointer
if (!q) {
return;
} }
q->cb_in = srslte_vec_u8_malloc(SRSLTE_LDPC_MAX_LEN_CB); if (q->temp_cb) {
if (!q->cb_in) { free(q->temp_cb);
return SRSLTE_ERROR;
} }
#ifdef LV_HAVE_AVX2 for (uint16_t ls = 0; ls <= MAX_LIFTSIZE; ls++) {
srslte_ldpc_encoder_type_t encoder_type = SRSLTE_LDPC_ENCODER_AVX2; if (q->encoder_bg1[ls]) {
#else // LV_HAVE_AVX2 srslte_ldpc_encoder_free(q->encoder_bg1[ls]);
srslte_ldpc_encoder_type_t encoder_type = SRSLTE_LDPC_ENCODER_C; free(q->encoder_bg1[ls]);
#endif // LV_HAVE_AVX2 }
if (q->encoder_bg2[ls]) {
srslte_ldpc_encoder_free(q->encoder_bg2[ls]);
free(q->encoder_bg2[ls]);
}
if (q->decoder_bg1[ls]) {
srslte_ldpc_decoder_free(q->decoder_bg1[ls]);
free(q->decoder_bg1[ls]);
}
if (q->decoder_bg2[ls]) {
srslte_ldpc_decoder_free(q->decoder_bg2[ls]);
free(q->decoder_bg2[ls]);
}
}
// Iterate over all possible lifting sizes srslte_ldpc_rm_tx_free(&q->tx_rm);
for (uint16_t ls = 0; ls < MAX_LIFTSIZE; ls++) { srslte_ldpc_rm_rx_free_c(&q->rx_rm);
uint8_t ls_index = get_ls_index(ls); }
// Invalid lifting size int srslte_dlsch_nr_encode(srslte_sch_nr_t* q,
if (ls_index == VOID_LIFTSIZE) { const srslte_pdsch_cfg_nr_t* pdsch_cfg,
q->encoder_bg1[ls] = NULL; const srslte_ra_tb_nr_t* tb,
q->encoder_bg2[ls] = NULL; const uint8_t* data,
continue; uint8_t* e_bits)
{
// Pointer protection
if (!q || !pdsch_cfg || !tb || !data || !e_bits) {
return SRSLTE_ERROR_INVALID_INPUTS;
} }
q->encoder_bg1[ls] = calloc(1, sizeof(srslte_ldpc_encoder_t)); uint8_t* output_ptr = e_bits;
if (!q->encoder_bg1[ls]) {
ERROR("Error: calloc\n"); srslte_sch_nr_common_cfg_t cfg = {};
if (srslte_dlsch_nr_fill_cfg(q, pdsch_cfg, tb, &cfg) < SRSLTE_SUCCESS) {
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
if (srslte_ldpc_encoder_init(q->encoder_bg1[ls], encoder_type, BG1, ls) < SRSLTE_SUCCESS) { // Check encoder
ERROR("Error: initialising BG1 LDPC encoder for ls=%d\n", ls); if (cfg.encoder == NULL) {
ERROR("Error: encoder for lifting size Z=%d not found\n", cfg.Z);
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
q->encoder_bg2[ls] = calloc(1, sizeof(srslte_ldpc_encoder_t)); // Check CRC for TB
if (!q->encoder_bg2[ls]) { if (cfg.crc_tb == NULL) {
ERROR("Error: CRC for TB not found\n");
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
if (srslte_ldpc_encoder_init(q->encoder_bg2[ls], encoder_type, BG2, ls) < SRSLTE_SUCCESS) { // Soft-buffer number of code-block protection
ERROR("Error: initialising BG2 LDPC encoder for ls=%d\n", ls); if (tb->softbuffer.tx->max_cb < cfg.Cp || tb->softbuffer.tx->max_cb_size < (cfg.encoder->liftN - 2 * cfg.Z)) {
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
}
return SRSLTE_SUCCESS; // Calculate TB CRC
} uint32_t checksum_tb = srslte_crc_checksum_byte(cfg.crc_tb, data, tb->tbs);
void srslte_sch_nr_free(srslte_sch_nr_encoder_t* q) // For each code block...
{ uint32_t j = 0;
if (q == NULL) { for (uint32_t r = 0; r < cfg.C; r++) {
return; // Select rate matching circular buffer
uint8_t* rm_buffer = tb->softbuffer.tx->buffer_b[r];
if (rm_buffer == NULL) {
ERROR("Error: soft-buffer provided NULL buffer for cb_idx=%d\n", r);
return SRSLTE_ERROR;
} }
if (q->cb_in) { // If data provided, encode and store in RM circular buffer
free(q->cb_in); if (data != NULL) {
} // If it is the last segment...
} if (r == cfg.C - 1) {
// Copy payload without TB CRC
srslte_bit_unpack_vector(data, q->temp_cb, (int)(cfg.Kp - cfg.L_cb - cfg.L_tb));
/** // Append TB CRC
* Implementation of TS 38.212 V15.9.0 Table 5.4.2.1-1: Value of n_prb_lbrm uint8_t* ptr = &q->temp_cb[cfg.Kp - cfg.L_cb - cfg.L_tb];
* @param nof_prb Maximum number of PRBs across all configured DL BWPs and UL BWPs of a carrier for DL-SCH and UL-SCH, srslte_bit_unpack(checksum_tb, &ptr, cfg.L_tb);
* respectively } else {
* @return It returns n_prb_lbrm // Copy payload
*/ srslte_bit_unpack_vector(data, q->temp_cb, (int)(cfg.Kp - cfg.L_cb));
uint32_t sch_nr_n_prb_lbrm(uint32_t nof_prb)
{
if (nof_prb < 33) {
return 32;
}
if (nof_prb <= 66) {
return 32;
} }
if (nof_prb <= 107) {
return 107; // Attach code block CRC if required
if (cfg.L_cb) {
srslte_crc_attach(&q->crc_cb, q->temp_cb, (int)(cfg.Kp - cfg.L_cb));
} }
if (nof_prb <= 135) {
return 135; // Insert filler bits
for (uint32_t i = cfg.Kp; i < cfg.Kr; i++) {
q->temp_cb[i] = FILLER_BIT;
} }
if (nof_prb <= 162) {
return 162; // Encode code block
srslte_ldpc_encoder_encode(cfg.encoder, q->temp_cb, rm_buffer, cfg.Kr);
} }
if (nof_prb <= 217) {
return 217; // Skip block
if (!cfg.mask[r]) {
continue;
} }
return 273; // Select rate matching output sequence number of bits
uint32_t E = sch_nr_get_E(&cfg, j);
j++;
// LDPC Rate matching
srslte_ldpc_rm_tx(&q->tx_rm, rm_buffer, output_ptr, E, cfg.bg, cfg.Z, tb->rv, tb->mod, cfg.Nref);
output_ptr += E;
} }
#define CEIL(NUM, DEN) (((NUM) + ((DEN)-1)) / (DEN)) return SRSLTE_SUCCESS;
#define MOD(NUM, DEN) ((NUM) % (DEN)) }
int srslte_dlsch_nr_encode(srslte_sch_nr_encoder_t* q, int srslte_dlsch_nr_decode(srslte_sch_nr_t* q,
const srslte_pdsch_cfg_nr_t* cfg, const srslte_pdsch_cfg_nr_t* pdsch_cfg,
const srslte_ra_tb_nr_t* tb, const srslte_ra_tb_nr_t* tb,
const uint8_t* data, int8_t* e_bits,
uint8_t* e_bits) uint8_t* data,
bool* crc_ok)
{ {
// Pointer protection // Pointer protection
if (!q || !cfg || !tb || !data || !e_bits) { if (!q || !pdsch_cfg || !tb || !data || !e_bits || !crc_ok) {
return SRSLTE_ERROR_INVALID_INPUTS; return SRSLTE_ERROR_INVALID_INPUTS;
} }
uint8_t* output_ptr = e_bits; int8_t* input_ptr = e_bits;
uint8_t* output_ptr = data;
// TS 38.212 V15.9.0 section 7.2.2 LDPC base graph selection
// if A ≤ 292 , or if A ≤ 3824 and R ≤ 0.67 , or if R ≤ 0 . 25 , LDPC base graph 2 is used;
// otherwise, LDPC base graph 1 is used,
srslte_basegraph_t bg = BG1;
if ((tb->tbs <= 292) || (tb->tbs <= 292 && tb->R <= 0.67) || (tb->R <= 0.25)) {
bg = BG2;
}
// Compute code block segmentation srslte_sch_nr_common_cfg_t cfg = {};
srslte_cbsegm_t cbsegm = {}; if (srslte_dlsch_nr_fill_cfg(q, pdsch_cfg, tb, &cfg) < SRSLTE_SUCCESS) {
if (bg == BG1) {
if (srslte_cbsegm_ldpc_bg1(&cbsegm, tb->tbs) != SRSLTE_SUCCESS) {
ERROR("Error: calculating LDPC BG1 code block segmentation for tbs=%d\n", tb->tbs);
return SRSLTE_ERROR;
}
} else {
if (srslte_cbsegm_ldpc_bg2(&cbsegm, tb->tbs) != SRSLTE_SUCCESS) {
ERROR("Error: calculating LDPC BG1 code block segmentation for tbs=%d\n", tb->tbs);
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
}
// Select encoder // Check decoder
if (cbsegm.Z > MAX_LIFTSIZE) { if (cfg.decoder == NULL) {
ERROR("Error: lifting size Z=%d is out-of-range\n", cbsegm.Z); ERROR("Error: decoder for lifting size Z=%d not found\n", cfg.Z);
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
srslte_ldpc_encoder_t* encoder = (bg == BG1) ? q->encoder_bg1[cbsegm.Z] : q->encoder_bg2[cbsegm.Z];
if (encoder == NULL) { // Check CRC for TB
ERROR("Error: encoder for lifting size Z=%d not found\n", cbsegm.Z); if (cfg.crc_tb == NULL) {
ERROR("Error: CRC for TB not found\n");
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
// Soft-buffer number of code-block protection // Soft-buffer number of code-block protection
if (tb->softbuffer.tx->max_cb < cbsegm.K1 || tb->softbuffer.tx->max_cb < cbsegm.C) { if (tb->softbuffer.rx->max_cb < cfg.Cp || tb->softbuffer.rx->max_cb_size < (cfg.decoder->liftN - 2 * cfg.Z)) {
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
// Compute derived RM parameters // Counter of code blocks that have matched CRC
uint32_t Qm = srslte_mod_bits_x_symbol(tb->mod); uint32_t cb_ok = 0;
// Calculate Nref
uint32_t N_re_lbrm = 156 * sch_nr_n_prb_lbrm(q->carrier.nof_prb);
double R_lbrm = 948.0 / 1024.0;
uint32_t Qm_lbrm = (cfg->mcs_table == srslte_mcs_table_256qam) ? 8 : 6;
uint32_t TBS_LRBM = srslte_ra_nr_tbs(N_re_lbrm, 1.0, R_lbrm, Qm_lbrm, cfg->serving_cell_cfg.max_mimo_layers);
uint32_t Nref = ceil(TBS_LRBM / (cbsegm.C * 2.0 / 3.0));
uint32_t N_L = tb->N_L;
// Calculate number of code blocks after applying CBGTI
uint32_t Cp = cbsegm.C; // ... obviously, not implemented
// Select CRC
srslte_crc_t* crc_tb = &q->crc_tb_16;
if (cbsegm.L_tb == 24) {
crc_tb = &q->crc_tb_24;
}
uint32_t checksum_tb = srslte_crc_checksum_byte(crc_tb, data, tb->tbs);
// Total number of bits, including CRCs
uint32_t Bp = cbsegm.tbs + cbsegm.L_tb + cbsegm.L_cb * cbsegm.C;
// Number of bits per code block
uint32_t Kp = Bp / cbsegm.C;
// For each code block... // For each code block...
uint32_t j = 0; uint32_t j = 0;
for (uint32_t r = 0; r < cbsegm.C; r++) { for (uint32_t r = 0; r < cfg.C; r++) {
uint8_t* rm_buffer = tb->softbuffer.tx->buffer_b[r]; bool decoded = tb->softbuffer.rx->cb_crc[r];
int8_t* rm_buffer = (int8_t*)tb->softbuffer.tx->buffer_b[r];
if (!rm_buffer) { if (!rm_buffer) {
ERROR("Error: soft-buffer provided NULL buffer for cb_idx=%d\n", r); ERROR("Error: soft-buffer provided NULL buffer for cb_idx=%d\n", r);
return SRSLTE_ERROR; return SRSLTE_ERROR;
} }
// If data provided, encode and store // Select rate matching output sequence number of bits
if (data) { if (decoded) {
// If it is the last segment... cb_ok++;
if (r == cbsegm.C - 1) { continue;
// Copy payload without TB CRC }
srslte_bit_unpack_vector(data, q->cb_in, (int)(Kp - cbsegm.L_cb - cbsegm.L_tb));
// Append TB CRC uint32_t E = sch_nr_get_E(&cfg, j);
uint8_t* ptr = &q->cb_in[Kp - cbsegm.L_cb - cbsegm.L_tb]; j++;
srslte_bit_unpack(checksum_tb, &ptr, cbsegm.L_cb);
// LDPC Rate matching
srslte_ldpc_rm_rx_c(&q->rx_rm, input_ptr, rm_buffer, E, cfg.F, cfg.bg, cfg.Z, tb->rv, tb->mod, cfg.Nref);
// Decode
srslte_ldpc_decoder_decode_c(cfg.decoder, rm_buffer, q->temp_cb);
// Compute CB CRC
uint32_t cb_len = cfg.Kp - cfg.L_cb;
if (cfg.L_cb) {
uint8_t* ptr = q->temp_cb;
uint32_t checksum1 = srslte_crc_checksum(&q->crc_cb, q->temp_cb, (int)cb_len);
uint32_t checksum2 = srslte_bit_pack(&ptr, cfg.L_cb);
tb->softbuffer.rx->cb_crc[r] = (checksum1 == checksum2);
// Pack only if CRC is match
if (tb->softbuffer.rx->cb_crc[r]) {
srslte_bit_pack_vector(q->temp_cb, tb->softbuffer.rx->data[r], cb_len);
}
} else { } else {
// Copy payload srslte_bit_pack_vector(q->temp_cb, tb->softbuffer.rx->data[r], cb_len);
srslte_bit_unpack_vector(data, q->cb_in, (int)(Kp - cbsegm.L_cb)); tb->softbuffer.rx->cb_crc[r] = true;
} }
// Attach code block CRC if required // Count if CB CRC OK
if (cbsegm.L_cb) { cb_ok += tb->softbuffer.rx->cb_crc[r];
srslte_crc_attach(&q->crc_cb, q->cb_in, Kp);
}
// Insert filler bits input_ptr += E;
for (uint32_t i = Kp; i < cbsegm.K1; i++) {
q->cb_in[i] = FILLER_BIT;
} }
// Encode code block // All CB are decoded
srslte_ldpc_encoder_encode(encoder, q->cb_in, rm_buffer, cbsegm.K1); if (cb_ok == cfg.C) {
uint32_t checksum2 = 0;
for (uint32_t r = 0; r < cfg.C; r++) {
uint32_t cb_len = cfg.Kp - cfg.L_cb;
// Subtract TB CRC from the last codde block
if (r == cfg.C - 1) {
cb_len -= cfg.L_tb;
} }
// Select rate matching output sequence number of bits srslte_vec_u8_copy(output_ptr, tb->softbuffer.rx->data[r], cb_len / 8);
uint32_t E = 0; output_ptr += cb_len / 8;
if (false) {
// if the r -th coded block is not scheduled for transmission as indicated by CBGTI if (r == cfg.C - 1) {
// ... currently not implemented uint8_t tb_crc_unpacked[24] = {};
} else { uint8_t* tb_crc_unpacked_ptr = tb_crc_unpacked;
if (r <= (Cp - MOD(tb->nof_bits / (tb->N_L * Qm), Cp) - 1)) { srslte_bit_unpack_vector(&tb->softbuffer.rx->data[r][cb_len / 8], tb_crc_unpacked, cfg.L_tb);
E = N_L * Qm * (tb->nof_bits / (tb->N_L * Qm * Cp)); checksum2 = srslte_bit_pack(&tb_crc_unpacked_ptr, cfg.L_tb);
} else {
E = N_L * Qm * CEIL(tb->nof_bits, tb->N_L * Qm * Cp);
} }
j++;
} }
// LDPC Rate matching // Calculate TB CRC from packed data
srslte_ldpc_rm_tx(&q->rm, rm_buffer, output_ptr, E, bg, cbsegm.Z, tb->rv, tb->mod, Nref); uint32_t checksum1 = srslte_crc_checksum_byte(cfg.crc_tb, data, tb->tbs);
output_ptr += E; *crc_ok = (checksum1 == checksum2);
} else {
*crc_ok = false;
} }
return SRSLTE_SUCCESS; return SRSLTE_SUCCESS;

7
lib/src/phy/phch/test/CMakeLists.txt
Unescape Escape View File

@ -617,3 +617,10 @@ if(RF_FOUND)
add_executable(prach_test_usrp prach_test_usrp.c) add_executable(prach_test_usrp prach_test_usrp.c)
target_link_libraries(prach_test_usrp srslte_rf srslte_phy pthread) target_link_libraries(prach_test_usrp srslte_rf srslte_phy pthread)
endif(RF_FOUND) endif(RF_FOUND)
########################################################################
# NR
########################################################################
add_executable(dlsch_nr_test dlsch_nr_test.c)
target_link_libraries(dlsch_nr_test srslte_phy)
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