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srsRAN_4G/srsue/src/phy/phy_common.cc

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/**
* Copyright 2013-2021 Software Radio Systems Limited
*
* This file is part of srsRAN.
*
* srsRAN 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.
*
* srsRAN 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 <sstream>
#include <string.h>
#include "srsran/srsran.h"
#include "srsue/hdr/phy/phy_common.h"
#define Error(fmt, ...) \
if (SRSRAN_DEBUG_ENABLED) \
logger.error(fmt, ##__VA_ARGS__)
#define Warning(fmt, ...) \
if (SRSRAN_DEBUG_ENABLED) \
logger.warning(fmt, ##__VA_ARGS__)
#define Info(fmt, ...) \
if (SRSRAN_DEBUG_ENABLED) \
logger.info(fmt, ##__VA_ARGS__)
#define Debug(fmt, ...) \
if (SRSRAN_DEBUG_ENABLED) \
logger.debug(fmt, ##__VA_ARGS__)
namespace srsue {
static srsran::rf_buffer_t zeros_multi(1);
phy_common::phy_common(srslog::basic_logger& logger) : logger(logger), ta(logger)
{
reset();
}
phy_common::~phy_common() = default;
void phy_common::init(phy_args_t* _args,
srsran::radio_interface_phy* _radio,
stack_interface_phy_lte* _stack,
rsrp_insync_itf* _chest_loop)
{
radio_h = _radio;
stack = _stack;
args = _args;
insync_itf = _chest_loop;
sr_last_tx_tti = -1;
// Instantiate UL channel emulator
if (args->ul_channel_args.enable) {
ul_channel = srsran::channel_ptr(
new srsran::channel(args->ul_channel_args, args->nof_lte_carriers * args->nof_rx_ant, logger));
}
}
void phy_common::set_ue_dl_cfg(srsran_ue_dl_cfg_t* ue_dl_cfg)
{
ue_dl_cfg->snr_to_cqi_offset = args->snr_to_cqi_offset;
srsran_chest_dl_cfg_t* chest_cfg = &ue_dl_cfg->chest_cfg;
// Setup estimator filter
bzero(chest_cfg, sizeof(srsran_chest_dl_cfg_t));
if (args->estimator_fil_auto) {
chest_cfg->filter_coef[0] = 0;
} else {
chest_cfg->filter_coef[0] = args->estimator_fil_order;
chest_cfg->filter_coef[1] = args->estimator_fil_stddev;
}
chest_cfg->filter_type = SRSRAN_CHEST_FILTER_GAUSS;
if (args->snr_estim_alg == "refs") {
chest_cfg->noise_alg = SRSRAN_NOISE_ALG_REFS;
} else if (args->snr_estim_alg == "empty") {
chest_cfg->noise_alg = SRSRAN_NOISE_ALG_EMPTY;
} else {
chest_cfg->noise_alg = SRSRAN_NOISE_ALG_PSS;
}
chest_cfg->rsrp_neighbour = false;
chest_cfg->sync_error_enable = args->correct_sync_error;
chest_cfg->estimator_alg =
args->interpolate_subframe_enabled ? SRSRAN_ESTIMATOR_ALG_INTERPOLATE : SRSRAN_ESTIMATOR_ALG_AVERAGE;
chest_cfg->cfo_estimate_enable = args->cfo_ref_mask != 0;
chest_cfg->cfo_estimate_sf_mask = args->cfo_ref_mask;
}
void phy_common::set_pdsch_cfg(srsran_pdsch_cfg_t* pdsch_cfg)
{
pdsch_cfg->csi_enable = args->pdsch_csi_enabled;
pdsch_cfg->max_nof_iterations = args->pdsch_max_its;
pdsch_cfg->meas_evm_en = args->meas_evm;
pdsch_cfg->decoder_type = (args->equalizer_mode == "zf") ? SRSRAN_MIMO_DECODER_ZF : SRSRAN_MIMO_DECODER_MMSE;
}
void phy_common::set_ue_ul_cfg(srsran_ue_ul_cfg_t* ue_ul_cfg)
{
// Setup uplink configuration
bzero(ue_ul_cfg, sizeof(srsran_ue_ul_cfg_t));
ue_ul_cfg->cfo_en = true;
if (args->force_ul_amplitude > 0.0f) {
ue_ul_cfg->force_peak_amplitude = args->force_ul_amplitude;
ue_ul_cfg->normalize_mode = SRSRAN_UE_UL_NORMALIZE_MODE_FORCE_AMPLITUDE;
} else {
ue_ul_cfg->normalize_mode = SRSRAN_UE_UL_NORMALIZE_MODE_AUTO;
}
ue_ul_cfg->ul_cfg.pucch.ack_nack_feedback_mode = SRSRAN_PUCCH_ACK_NACK_FEEDBACK_MODE_NORMAL;
}
srsran::radio_interface_phy* phy_common::get_radio()
{
return radio_h;
}
// Unpack RAR dci as defined in Section 6.2 of 36.213
void phy_common::set_rar_grant(uint8_t grant_payload[SRSRAN_RAR_GRANT_LEN],
uint16_t rnti,
srsran_tdd_config_t tdd_config)
{
#if MSG3_DELAY_MS < 0
#error "Error MSG3_DELAY_MS can't be negative"
#endif /* MSG3_DELAY_MS < 0 */
if (rar_grant_tti < 0) {
Error("Must call set_rar_grant_tti before set_rar_grant");
}
srsran_dci_ul_t dci_ul;
srsran_dci_rar_grant_t rar_grant;
srsran_dci_rar_unpack(grant_payload, &rar_grant);
if (srsran_dci_rar_to_ul_dci(&cell, &rar_grant, &dci_ul)) {
Error("Converting RAR message to UL dci");
return;
}
dci_ul.format = SRSRAN_DCI_FORMAT_RAR; // Use this format to identify a RAR grant
dci_ul.rnti = rnti;
uint32_t msg3_tx_tti;
if (rar_grant.ul_delay) {
msg3_tx_tti = (TTI_TX(rar_grant_tti) + MSG3_DELAY_MS + 1) % 10240;
} else {
msg3_tx_tti = (TTI_TX(rar_grant_tti) + MSG3_DELAY_MS) % 10240;
}
if (cell.frame_type == SRSRAN_TDD) {
while (srsran_sfidx_tdd_type(tdd_config, msg3_tx_tti % 10) != SRSRAN_TDD_SF_U) {
msg3_tx_tti++;
}
}
// Save Msg3 UL dci
std::lock_guard<std::mutex> lock(pending_ul_grant_mutex);
pending_ul_grant_t& pending_grant = pending_ul_grant[0][msg3_tx_tti];
if (!pending_grant.enable) {
Debug("RAR grant rar_grant=%d, msg3_tti=%d, stored in index=%d", rar_grant_tti, msg3_tx_tti, TTIMOD(msg3_tx_tti));
pending_grant.pid = ul_pidof(msg3_tx_tti, &tdd_config);
pending_grant.dci = dci_ul;
pending_grant.enable = true;
} else {
Warning("set_rar_grant: sf->tti=%d, cc=%d already in use", msg3_tx_tti, 0);
}
rar_grant_tti = -1;
}
// Table 8-2
const static uint32_t k_pusch[7][10] = {
{4, 6, 0, 0, 0, 4, 6, 0, 0, 0},
{0, 6, 0, 0, 4, 0, 6, 0, 0, 4},
{0, 0, 0, 4, 0, 0, 0, 0, 4, 0},
{4, 0, 0, 0, 0, 0, 0, 0, 4, 4},
{0, 0, 0, 0, 0, 0, 0, 0, 4, 4},
{0, 0, 0, 0, 0, 0, 0, 0, 4, 0},
{7, 7, 0, 0, 0, 7, 7, 0, 0, 5},
};
const static uint32_t k_phich[7][10] = {{0, 0, 4, 7, 6, 0, 0, 4, 7, 6},
{0, 0, 4, 6, 0, 0, 0, 4, 6, 0},
{0, 0, 6, 0, 0, 0, 0, 6, 0, 0},
{0, 0, 6, 6, 6, 0, 0, 0, 0, 0},
{0, 0, 6, 6, 0, 0, 0, 0, 0, 0},
{0, 0, 6, 0, 0, 0, 0, 0, 0, 0},
{0, 0, 4, 6, 6, 0, 0, 4, 7, 0}};
uint32_t phy_common::ul_pidof(uint32_t tti, srsran_tdd_config_t* tdd_config)
{
if (tdd_config->configured) {
/* In TDD modes 1-5, each PID is associated with a unique subframe and the number of harq processes equals the
* number of UL subframes Modes 0 and 6 have more processes than UL subframes and PID depends on sfn
*/
uint32_t sf_idx = tti % 10;
uint32_t sfn = tti / 10;
uint32_t cycle_idx;
switch (tdd_config->sf_config) {
case 0:
cycle_idx = 7 - sfn % 7;
if (sf_idx < 5) {
return (cycle_idx + sf_idx - 2) % 7;
} else {
return (cycle_idx + sf_idx - 4) % 7;
}
case 1:
if (sf_idx < 5) {
return sf_idx - 2;
} else {
return sf_idx - 5;
}
case 2:
if (sf_idx < 5) {
return 0;
} else {
return 1;
}
case 3:
case 4:
case 5:
return sf_idx - 2;
case 6:
cycle_idx = 6 - sfn % 6;
if (sf_idx < 5) {
return (cycle_idx + sf_idx - 2) % 6;
} else {
return (cycle_idx + sf_idx - 4) % 6;
}
default:
Error("Invalid SF configuration %d", tdd_config->sf_config);
}
} else {
return tti % SRSRAN_FDD_NOF_HARQ;
}
return 0;
}
// Computes SF->TTI at which PHICH will be received according to 9.1.2 of 36.213
#define tti_phich(sf) \
(sf->tti + (cell.frame_type == SRSRAN_FDD ? FDD_HARQ_DELAY_UL_MS : k_phich[sf->tdd_config.sf_config][sf->tti % 10]))
// Here SF->TTI is when PUSCH is transmitted
void phy_common::set_ul_pending_ack(srsran_ul_sf_cfg_t* sf,
uint32_t cc_idx,
srsran_phich_grant_t phich_grant,
srsran_dci_ul_t* dci_ul)
{
// Use a lock here because subframe 4 and 9 of TDD config 0 accept multiple PHICH from multiple frames
std::lock_guard<std::mutex> lock(pending_ul_ack_mutex);
pending_ul_ack_t& pending_ack = pending_ul_ack[cc_idx][phich_grant.I_phich][tti_phich(sf)];
if (!pending_ack.enable) {
pending_ack.dci_ul = *dci_ul;
pending_ack.phich_grant = phich_grant;
pending_ack.enable = true;
Debug("Set pending ACK for sf->tti=%d n_dmrs=%d, I_phich=%d, cc_idx=%d",
sf->tti,
phich_grant.n_dmrs,
phich_grant.I_phich,
cc_idx);
} else {
Warning("set_ul_pending_ack: sf->tti=%d, cc=%d already in use", sf->tti, cc_idx);
}
}
// Here SF->TTI is when PHICH is being transmitted so that's DL subframe
bool phy_common::get_ul_pending_ack(srsran_dl_sf_cfg_t* sf,
uint32_t cc_idx,
srsran_phich_grant_t* phich_grant,
srsran_dci_ul_t* dci_ul)
{
std::lock_guard<std::mutex> lock(pending_ul_ack_mutex);
bool ret = false;
pending_ul_ack_t& pending_ack = pending_ul_ack[cc_idx][phich_grant->I_phich][sf->tti];
if (pending_ack.enable) {
*phich_grant = pending_ack.phich_grant;
*dci_ul = pending_ack.dci_ul;
ret = true;
pending_ack.enable = false;
Debug("Get pending ACK for sf->tti=%d n_dmrs=%d, I_phich=%d", sf->tti, phich_grant->n_dmrs, phich_grant->I_phich);
}
return ret;
}
bool phy_common::is_any_ul_pending_ack()
{
std::lock_guard<std::mutex> lock(pending_ul_ack_mutex);
for (const auto& i : pending_ul_ack) {
for (const auto& j : i) {
if (std::any_of(j.begin(), j.end(), [](const pending_ul_ack_t& ack) { return ack.enable; })) {
return true;
}
}
}
return false;
}
// Computes SF->TTI at which PUSCH will be transmitted according to Section 8 of 36.213
#define tti_pusch_hi(sf) \
(sf->tti + \
(cell.frame_type == SRSRAN_FDD ? FDD_HARQ_DELAY_UL_MS \
: I_phich ? 7 : k_pusch[sf->tdd_config.sf_config][sf->tti % 10]) + \
(FDD_HARQ_DELAY_DL_MS - FDD_HARQ_DELAY_UL_MS))
#define tti_pusch_gr(sf) \
(sf->tti + \
(cell.frame_type == SRSRAN_FDD ? FDD_HARQ_DELAY_UL_MS \
: dci->ul_idx == 1 ? 7 : k_pusch[sf->tdd_config.sf_config][sf->tti % 10]) + \
(FDD_HARQ_DELAY_DL_MS - FDD_HARQ_DELAY_UL_MS))
// SF->TTI is at which Format0 dci is received
void phy_common::set_ul_pending_grant(srsran_dl_sf_cfg_t* sf, uint32_t cc_idx, srsran_dci_ul_t* dci)
{
std::lock_guard<std::mutex> lock(pending_ul_grant_mutex);
// Calculate PID for this SF->TTI
uint32_t pid = ul_pidof(tti_pusch_gr(sf), &sf->tdd_config);
pending_ul_grant_t& pending_grant = pending_ul_grant[cc_idx][tti_pusch_gr(sf)];
if (!pending_grant.enable) {
pending_grant.pid = pid;
pending_grant.dci = *dci;
pending_grant.enable = true;
Debug("Set ul pending grant for sf->tti=%d current_tti=%d, pid=%d", tti_pusch_gr(sf), sf->tti, pid);
} else {
Info("set_ul_pending_grant: sf->tti=%d, cc=%d already in use", sf->tti, cc_idx);
}
}
// SF->TTI at which PUSCH should be transmitted
bool phy_common::get_ul_pending_grant(srsran_ul_sf_cfg_t* sf, uint32_t cc_idx, uint32_t* pid, srsran_dci_ul_t* dci)
{
std::lock_guard<std::mutex> lock(pending_ul_grant_mutex);
bool ret = false;
pending_ul_grant_t& pending_grant = pending_ul_grant[cc_idx][sf->tti];
if (pending_grant.enable) {
Debug("Reading grant sf->tti=%d idx=%d", sf->tti, TTIMOD(sf->tti));
if (pid) {
*pid = pending_grant.pid;
}
if (dci) {
*dci = pending_grant.dci;
}
pending_grant.enable = false;
ret = true;
}
return ret;
}
uint32_t phy_common::get_ul_uci_cc(uint32_t tti_tx) const
{
std::lock_guard<std::mutex> lock(pending_ul_grant_mutex);
for (uint32_t cc = 0; cc < args->nof_lte_carriers; cc++) {
const pending_ul_grant_t& grant = pending_ul_grant[cc][tti_tx];
if (grant.enable) {
return cc;
}
}
return 0; // Return Primary cell
}
// SF->TTI at which PHICH is received
void phy_common::set_ul_received_ack(srsran_dl_sf_cfg_t* sf,
uint32_t cc_idx,
bool ack_value,
uint32_t I_phich,
srsran_dci_ul_t* dci_ul)
{
std::lock_guard<std::mutex> lock(received_ul_ack_mutex);
received_ul_ack_t& received_ack = received_ul_ack[cc_idx][tti_pusch_hi(sf)];
received_ack.hi_present = true;
received_ack.hi_value = ack_value;
received_ack.dci_ul = *dci_ul;
Debug("Set ul received ack for sf->tti=%d, current_tti=%d", tti_pusch_hi(sf), sf->tti);
}
// SF->TTI at which PUSCH will be transmitted
bool phy_common::get_ul_received_ack(srsran_ul_sf_cfg_t* sf, uint32_t cc_idx, bool* ack_value, srsran_dci_ul_t* dci_ul)
{
std::lock_guard<std::mutex> lock(received_ul_ack_mutex);
bool ret = false;
received_ul_ack_t& received_ack = received_ul_ack[cc_idx][sf->tti];
if (received_ack.hi_present) {
if (ack_value) {
*ack_value = received_ack.hi_value;
}
if (dci_ul) {
*dci_ul = received_ack.dci_ul;
}
Debug("Get ul received ack for current_tti=%d", sf->tti);
received_ack.hi_present = false;
ret = true;
}
return ret;
}
// SF->TTI at which PDSCH is decoded and ACK generated
void phy_common::set_dl_pending_ack(srsran_dl_sf_cfg_t* sf,
uint32_t cc_idx,
uint8_t value[SRSRAN_MAX_CODEWORDS],
srsran_pdsch_ack_resource_t resource)
{
std::lock_guard<std::mutex> lock(pending_dl_ack_mutex);
received_ack_t& pending_ack = pending_dl_ack[cc_idx][sf->tti];
if (!pending_ack.enable) {
pending_ack.enable = true;
pending_ack.resource = resource;
memcpy(pending_ack.value, value, SRSRAN_MAX_CODEWORDS * sizeof(uint8_t));
Debug("Set dl pending ack for sf->tti=%d, value=%d, ncce=%d", sf->tti, value[0], resource.n_cce);
} else {
Warning("pending_dl_ack: sf->tti=%d, cc=%d already in use", sf->tti, cc_idx);
}
}
void phy_common::set_rar_grant_tti(uint32_t tti)
{
rar_grant_tti = tti;
}
void phy_common::set_dl_pending_grant(uint32_t tti,
uint32_t cc_idx,
uint32_t grant_cc_idx,
const srsran_dci_dl_t* dl_dci)
{
std::lock_guard<std::mutex> lock(pending_dl_grant_mutex);
if (!pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].enable) {
pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].dl_dci = *dl_dci;
pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].grant_cc_idx = grant_cc_idx;
pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].enable = true;
} else {
Info("set_dl_pending_grant: cc=%d already exists", cc_idx);
}
}
bool phy_common::get_dl_pending_grant(uint32_t tti, uint32_t cc_idx, uint32_t* grant_cc_idx, srsran_dci_dl_t* dl_dci)
{
std::lock_guard<std::mutex> lock(pending_dl_grant_mutex);
if (pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].enable) {
// Read grant
if (dl_dci) {
*dl_dci = pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].dl_dci;
}
if (grant_cc_idx) {
*grant_cc_idx = pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].grant_cc_idx;
}
// Reset read flag
pending_dl_grant[tti % FDD_HARQ_DELAY_UL_MS][cc_idx].enable = false;
return true;
} else {
return false;
}
}
typedef struct {
uint32_t M;
uint32_t K[9];
} das_index_t;
// Downlink association set index, Table 10.1-1 36.213
das_index_t das_table[7][10] = {
{{0, {}}, {0, {}}, {1, {6}}, {0, {}}, {1, {4}}, {0, {}}, {0, {}}, {1, {6}}, {0, {}}, {1, {4}}},
{{0, {}}, {0, {}}, {2, {7, 6}}, {1, {4}}, {0, {}}, {0, {}}, {0, {}}, {2, {7, 6}}, {1, {4}}, {0, {}}},
{{0, {}}, {0, {}}, {4, {8, 7, 4, 6}}, {0, {}}, {0, {}}, {0, {}}, {0, {}}, {4, {8, 7, 4, 6}}, {0, {}}, {0, {}}},
{{0, {}}, {0, {}}, {3, {7, 6, 11}}, {2, {6, 5}}, {2, {5, 4}}, {0, {}}, {0, {}}, {0, {}}, {0, {}}, {0, {}}},
{{0, {}}, {0, {}}, {4, {12, 8, 7, 11}}, {4, {6, 5, 4, 7}}, {0, {}}, {0, {}}, {0, {}}, {0, {}}, {0, {}}, {0, {}}},
{{0, {}},
{0, {}},
{9, {13, 12, 9, 8, 7, 5, 4, 11, 6}},
{0, {}},
{0, {}},
{0, {}},
{0, {}},
{0, {}},
{0, {}},
{0, {}}},
{{0, {}}, {0, {}}, {1, {7}}, {1, {7}}, {1, {5}}, {0, {}}, {0, {}}, {1, {7}}, {1, {7}}, {0, {}}}};
// SF->TTI at which ACK/NACK would be transmitted
bool phy_common::get_dl_pending_ack(srsran_ul_sf_cfg_t* sf, uint32_t cc_idx, srsran_pdsch_ack_cc_t* ack)
{
std::lock_guard<std::mutex> lock(pending_dl_ack_mutex);
bool ret = false;
uint32_t M;
if (cell.frame_type == SRSRAN_FDD) {
M = 1;
} else {
M = das_table[sf->tdd_config.sf_config][sf->tti % 10].M;
}
for (uint32_t i = 0; i < M; i++) {
uint32_t k =
(cell.frame_type == SRSRAN_FDD) ? FDD_HARQ_DELAY_UL_MS : das_table[sf->tdd_config.sf_config][sf->tti % 10].K[i];
uint32_t pdsch_tti = TTI_SUB(sf->tti, k + (FDD_HARQ_DELAY_DL_MS - FDD_HARQ_DELAY_UL_MS));
received_ack_t& pending_ack = pending_dl_ack[cc_idx][pdsch_tti];
if (pending_ack.enable) {
ack->m[i].present = true;
ack->m[i].k = k;
ack->m[i].resource = pending_ack.resource;
memcpy(ack->m[i].value, pending_ack.value, SRSRAN_MAX_CODEWORDS * sizeof(uint8_t));
Debug("Get dl pending ack for sf->tti=%d, i=%d, k=%d, pdsch_tti=%d, value=%d, ncce=%d, v_dai=%d",
sf->tti,
i,
k,
pdsch_tti,
ack->m[i].value[0],
ack->m[i].resource.n_cce,
ack->m[i].resource.v_dai_dl);
ret = true;
}
pending_ack = {};
}
ack->M = ret ? M : 0;
return ret;
}
/* The transmission of UL subframes must be in sequence. The correct sequence is guaranteed by a chain of N semaphores,
* one per SF->TTI%max_workers. Each threads waits for the semaphore for the current thread and after transmission
* allows next SF->TTI to be transmitted
*
* Each worker uses this function to indicate that all processing is done and data is ready for transmission or
* there is no transmission at all (tx_enable). In that case, the end of burst message will be sent to the radio
*/
void phy_common::worker_end(void* tx_sem_id,
bool tx_enable,
srsran::rf_buffer_t& buffer,
srsran::rf_timestamp_t& tx_time,
bool is_nr)
{
// Wait for the green light to transmit in the current TTI
semaphore.wait(tx_sem_id);
// If this is for NR, save Tx buffers...
if (is_nr) {
nr_tx_buffer = buffer;
nr_tx_buffer_ready = true;
semaphore.release();
return;
}
// ... otherwise, append NR base-band from saved buffer if available
if (nr_tx_buffer_ready) {
// Load NR carrier base-band
for (uint32_t i = 0; i < args->nof_nr_carriers * args->nof_rx_ant; i++) {
uint32_t channel_idx = args->nof_lte_carriers * args->nof_rx_ant + i;
buffer.set(channel_idx, nr_tx_buffer.get(i));
}
// Remove NR buffer flag
nr_tx_buffer_ready = false;
// Make sure it transmits in this TTI
tx_enable = true;
}
// Add Time Alignment
tx_time.sub((double)ta.get_sec());
// For each radio, transmit
if (tx_enable) {
if (ul_channel) {
ul_channel->run(buffer.to_cf_t(), buffer.to_cf_t(), buffer.get_nof_samples(), tx_time.get(0));
}
radio_h->tx(buffer, tx_time);
} else {
if (radio_h->is_continuous_tx()) {
if (is_pending_tx_end) {
radio_h->tx_end();
is_pending_tx_end = false;
} else {
if (!radio_h->get_is_start_of_burst()) {
if (ul_channel) {
srsran_vec_cf_zero(zeros_multi.get(0), buffer.get_nof_samples());
ul_channel->run(zeros_multi.to_cf_t(), zeros_multi.to_cf_t(), buffer.get_nof_samples(), tx_time.get(0));
}
zeros_multi.set_nof_samples(buffer.get_nof_samples());
radio_h->tx(zeros_multi, tx_time);
}
}
} else {
radio_h->tx_end();
}
}
// Allow next TTI to transmit
semaphore.release();
}
void phy_common::set_cell(const srsran_cell_t& c)
{
cell = c;
if (ul_channel) {
ul_channel->set_srate((uint32_t)srsran_sampling_freq_hz(cell.nof_prb));
}
}
void phy_common::update_cfo_measurement(uint32_t cc_idx, float cfo_hz)
{
std::unique_lock<std::mutex> lock(meas_mutex);
// Use SNR EMA coefficient for averaging
avg_cfo_hz[cc_idx] = SRSRAN_VEC_SAFE_EMA(cfo_hz, avg_cfo_hz[cc_idx], args->snr_ema_coeff);
}
void phy_common::reset_measurements(uint32_t cc_idx)
{
// If the CC index exceeds the maximum number of carriers, reset them all
if (cc_idx >= SRSRAN_MAX_CARRIERS) {
for (uint32_t cc = 0; cc < SRSRAN_MAX_CARRIERS; cc++) {
reset_measurements(cc);
}
}
// Default all metrics to NAN to prevent providing invalid information on traces and other layers
std::unique_lock<std::mutex> lock(meas_mutex);
pathloss[cc_idx] = NAN;
avg_rsrp[cc_idx] = NAN;
avg_rsrp_dbm[cc_idx] = NAN;
avg_rsrq_db[cc_idx] = NAN;
avg_rssi_dbm[cc_idx] = NAN;
avg_cfo_hz[cc_idx] = NAN;
avg_sinr_db[cc_idx] = NAN;
avg_snr_db[cc_idx] = NAN;
avg_noise[cc_idx] = NAN;
avg_rsrp_neigh[cc_idx] = NAN;
}
void phy_common::update_measurements(uint32_t cc_idx,
const srsran_chest_dl_res_t& chest_res,
srsran_dl_sf_cfg_t sf_cfg_dl,
float tx_crs_power,
std::vector<phy_meas_t>& serving_cells,
cf_t* rssi_power_buffer)
{
bool insync = true;
{
std::unique_lock<std::mutex> lock(meas_mutex);
float snr_ema_coeff = args->snr_ema_coeff;
// In TDD, ignore special subframes without PDSCH
if (srsran_sfidx_tdd_type(sf_cfg_dl.tdd_config, sf_cfg_dl.tti % 10) == SRSRAN_TDD_SF_S &&
srsran_sfidx_tdd_nof_dw(sf_cfg_dl.tdd_config) < 4) {
return;
}
// Only worker 0 reads the RSSI sensor
if (rssi_power_buffer) {
if (!rssi_read_cnt) {
// Average RSSI over all symbols in antenna port 0 (make sure SF length is non-zero)
float rssi_dbm = SRSRAN_SF_LEN_PRB(cell.nof_prb) > 0
? (srsran_convert_power_to_dB(
srsran_vec_avg_power_cf(rssi_power_buffer, SRSRAN_SF_LEN_PRB(cell.nof_prb))) +
30)
: 0;
if (std::isnormal(rssi_dbm)) {
avg_rssi_dbm[0] = SRSRAN_VEC_SAFE_EMA(rssi_dbm, avg_rssi_dbm[0], args->snr_ema_coeff);
}
rx_gain_offset = get_radio()->get_rx_gain() + args->rx_gain_offset;
}
rssi_read_cnt++;
if (rssi_read_cnt == 1000) {
rssi_read_cnt = 0;
}
}
// Average RSRQ over DEFAULT_MEAS_PERIOD_MS then sent to RRC
float rsrq_db = chest_res.rsrq_db;
if (std::isnormal(rsrq_db)) {
// Reset average RSRQ measurement
if (sf_cfg_dl.tti % pcell_report_period == 0) {
avg_rsrq_db[cc_idx] = NAN;
}
avg_rsrq_db[cc_idx] = SRSRAN_VEC_SAFE_CMA(rsrq_db, avg_rsrq_db[cc_idx], sf_cfg_dl.tti % pcell_report_period);
}
// Average RSRP taken from CRS
float rsrp_lin = chest_res.rsrp;
if (std::isnormal(rsrp_lin)) {
avg_rsrp[cc_idx] = SRSRAN_VEC_SAFE_EMA(rsrp_lin, avg_rsrp[cc_idx], snr_ema_coeff);
}
/* Correct absolute power measurements by RX gain offset */
float rsrp_dbm = chest_res.rsrp_dbm - rx_gain_offset;
// Serving cell RSRP measurements are averaged over DEFAULT_MEAS_PERIOD_MS then sent to RRC
if (std::isnormal(rsrp_dbm)) {
// Reset average RSRP measurement
if (sf_cfg_dl.tti % pcell_report_period == 0) {
avg_rsrp_dbm[cc_idx] = NAN;
}
avg_rsrp_dbm[cc_idx] = SRSRAN_VEC_SAFE_CMA(rsrp_dbm, avg_rsrp_dbm[cc_idx], sf_cfg_dl.tti % pcell_report_period);
}
// Compute PL
pathloss[cc_idx] = tx_crs_power - avg_rsrp_dbm[cc_idx];
// Average noise
float cur_noise = chest_res.noise_estimate;
if (std::isnormal(cur_noise)) {
avg_noise[cc_idx] = SRSRAN_VEC_SAFE_EMA(cur_noise, avg_noise[cc_idx], snr_ema_coeff);
}
// Calculate SINR using CRS from neighbours if are detected
float sinr_db = chest_res.snr_db;
if (std::isnormal(avg_rsrp_neigh[cc_idx])) {
cur_noise /= srsran_convert_dB_to_power(rx_gain_offset - 30);
// Normalize the measured power ot the fraction of CRS pilots per PRB. Assume all neighbours have the same
// number of ports and CP length
uint32_t nof_re_x_prb = SRSRAN_NRE * (SRSRAN_CP_NSYMB(cell.cp));
float factor = nof_re_x_prb / (srsran_refsignal_cs_nof_pilots_x_slot(cell.nof_ports));
sinr_db = avg_rsrp_dbm[cc_idx] - srsran_convert_power_to_dB(avg_rsrp_neigh[cc_idx] / factor + cur_noise);
}
// Average sinr in the log domain
if (std::isnormal(sinr_db)) {
avg_sinr_db[cc_idx] = SRSRAN_VEC_SAFE_EMA(sinr_db, avg_sinr_db[cc_idx], snr_ema_coeff);
}
// Average snr in the log domain
if (std::isnormal(chest_res.snr_db)) {
avg_snr_db[cc_idx] = SRSRAN_VEC_SAFE_EMA(chest_res.snr_db, avg_snr_db[cc_idx], snr_ema_coeff);
}
// Store metrics
ch_metrics_t ch = {};
ch.n = avg_noise[cc_idx];
ch.rsrp = avg_rsrp_dbm[cc_idx];
ch.rsrq = avg_rsrq_db[cc_idx];
ch.rssi = avg_rssi_dbm[cc_idx];
ch.pathloss = pathloss[cc_idx];
ch.sinr = avg_sinr_db[cc_idx];
ch.sync_err = chest_res.sync_error;
set_ch_metrics(cc_idx, ch);
// Prepare measurements for serving cells - skip if any measurement is invalid assuming pure zeros are not possible
if (std::isnormal(avg_rsrp_dbm[cc_idx]) and
std::isnormal(avg_cfo_hz[cc_idx] and ((sf_cfg_dl.tti % pcell_report_period) == pcell_report_period - 1))) {
phy_meas_t meas = {};
meas.rsrp = avg_rsrp_dbm[cc_idx];
meas.rsrq = avg_rsrq_db[cc_idx];
meas.cfo_hz = avg_cfo_hz[cc_idx];
// Save PCI and EARFCN (if available)
if (cc_idx == 0) {
meas.pci = cell.id;
} else {
meas.earfcn = cell_state.get_earfcn(cc_idx);
meas.pci = cell_state.get_pci(cc_idx);
}
serving_cells.push_back(meas);
}
// Check in-sync / out-sync conditions. Use SNR instead of SINR for RLF threshold
if (cc_idx == 0) {
if (avg_rsrp_dbm[0] > args->in_sync_rsrp_dbm_th && avg_snr_db[0] > args->in_sync_snr_db_th) {
logger.debug("SNR=%.1f dB, RSRP=%.1f dBm sync=in-sync from channel estimator", avg_snr_db[0], avg_rsrp_dbm[0]);
} else {
logger.warning(
"SNR=%.1f dB RSRP=%.1f dBm, sync=out-of-sync from channel estimator", avg_snr_db[0], avg_rsrp_dbm[0]);
insync = false;
}
}
}
// Report in-sync status to the stack outside the mutex lock
if (insync_itf && cc_idx == 0) {
if (insync) {
insync_itf->in_sync();
} else {
insync_itf->out_of_sync();
}
}
// Call feedback loop for chest
if (cc_idx == 0) {
if (insync_itf && ((1U << (sf_cfg_dl.tti % 10U)) & args->cfo_ref_mask)) {
insync_itf->set_cfo(chest_res.cfo);
}
}
}
void phy_common::set_dl_metrics(uint32_t cc_idx, const dl_metrics_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
dl_metrics[cc_idx].set(m);
}
void phy_common::get_dl_metrics(dl_metrics_t::array_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
for (uint32_t i = 0; i < args->nof_lte_carriers; i++) {
m[i] = dl_metrics[i];
dl_metrics[i].reset();
}
}
void phy_common::set_ch_metrics(uint32_t cc_idx, const ch_metrics_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
ch_metrics[cc_idx].set(m);
}
void phy_common::get_ch_metrics(ch_metrics_t::array_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
for (uint32_t i = 0; i < args->nof_lte_carriers; i++) {
m[i] = ch_metrics[i];
ch_metrics[i].reset();
}
}
void phy_common::set_ul_metrics(uint32_t cc_idx, const ul_metrics_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
ul_metrics[cc_idx].set(m);
}
void phy_common::get_ul_metrics(ul_metrics_t::array_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
for (uint32_t i = 0; i < args->nof_lte_carriers; i++) {
m[i] = ul_metrics[i];
ul_metrics[i].reset();
}
}
void phy_common::set_sync_metrics(const uint32_t& cc_idx, const sync_metrics_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
sync_metrics[cc_idx].set(m);
}
void phy_common::get_sync_metrics(sync_metrics_t::array_t& m)
{
std::unique_lock<std::mutex> lock(metrics_mutex);
for (uint32_t i = 0; i < args->nof_lte_carriers; i++) {
m[i] = sync_metrics[i];
sync_metrics[i].reset();
}
}
void phy_common::reset_radio()
{
// End Tx streams even if they are continuous
// Since is_first_of_burst is set to true, the radio need to send
// end of burst in order to stall correctly the Tx stream.
// This is required for UHD version 3.10 and newer.
is_pending_tx_end = true;
}
void phy_common::reset()
{
reset_radio();
sr_enabled = false;
cur_pathloss = 0;
cur_pusch_power = 0;
sr_last_tx_tti = -1;
last_ri = 0;
// Reset all measurements
reset_measurements(SRSRAN_MAX_CARRIERS);
// Reset all SCell states
cell_state.reset();
// Note: Using memset to reset these members is forbidden because they are real objects, not plain arrays.
{
std::lock_guard<std::mutex> lock(pending_dl_ack_mutex);
for (auto& i : pending_dl_ack) {
i = {};
}
}
for (auto& i : pending_dl_dai) {
i = {};
}
{
std::lock_guard<std::mutex> lock(pending_ul_ack_mutex);
for (auto& i : pending_ul_ack) {
for (auto& j : i) {
j = {};
}
}
}
{
std::lock_guard<std::mutex> lock(pending_ul_grant_mutex);
for (auto& i : pending_ul_grant) {
i = {};
}
}
}
/* Convert 6-bit maps to 10-element subframe tables
bitmap = |0|0|0|0|0|0|
subframe index = |1|2|3|6|7|8|
*/
void phy_common::build_mch_table()
{
// First reset tables
bzero(&mch_table[0], sizeof(uint8_t) * 40);
// 40 element table represents 4 frames (40 subframes)
if (mbsfn_config.mbsfn_subfr_cnfg.nof_alloc_subfrs == srsran::mbsfn_sf_cfg_t::sf_alloc_type_t::one_frame) {
generate_mch_table(&mch_table[0], (uint32_t)mbsfn_config.mbsfn_subfr_cnfg.sf_alloc, 1u);
} else if (mbsfn_config.mbsfn_subfr_cnfg.nof_alloc_subfrs == srsran::mbsfn_sf_cfg_t::sf_alloc_type_t::four_frames) {
generate_mch_table(&mch_table[0], (uint32_t)mbsfn_config.mbsfn_subfr_cnfg.sf_alloc, 4u);
} else {
logger.error("The subframe config has not been set for MBSFN");
}
// Debug
std::stringstream ss;
ss << "|";
for (uint32_t j = 0; j < 40; j++) {
ss << (int)mch_table[j] << "|";
}
Info("MCH table: %s", ss.str().c_str());
}
void phy_common::build_mcch_table()
{
// First reset tables
bzero(&mcch_table[0], sizeof(uint8_t) * 10);
generate_mcch_table(&mcch_table[0], (uint32_t)mbsfn_config.mbsfn_area_info.mcch_cfg.sf_alloc_info);
// Debug
std::stringstream ss;
ss << "|";
for (uint32_t j = 0; j < 10; j++) {
ss << (int)mcch_table[j] << "|";
}
Info("MCCH table: %s", ss.str().c_str());
sib13_configured = true;
}
void phy_common::set_mcch()
{
mcch_configured = true;
}
void phy_common::set_mch_period_stop(uint32_t stop)
{
std::lock_guard<std::mutex> lock(mtch_mutex);
have_mtch_stop = true;
mch_period_stop = stop;
mtch_cvar.notify_one();
}
uint32_t phy_common::get_ul_earfcn(uint32_t dl_earfcn)
{
// Set default UL-EARFCN
uint32_t ul_earfcn = srsran_band_ul_earfcn(dl_earfcn);
// Try to find current DL-EARFCN in the map
auto it = args->ul_earfcn_map.find(dl_earfcn);
if (it != args->ul_earfcn_map.end()) {
// If found UL EARFCN in the map, use it
ul_earfcn = it->second;
}
return ul_earfcn;
}
bool phy_common::is_mch_subframe(srsran_mbsfn_cfg_t* cfg, uint32_t phy_tti)
{
uint32_t sfn; // System Frame Number
uint8_t sf; // Subframe
uint8_t offset;
uint8_t period;
sfn = phy_tti / 10;
sf = phy_tti % 10;
// Set some defaults
cfg->mbsfn_area_id = 0;
cfg->non_mbsfn_region_length = 1;
cfg->mbsfn_mcs = 2;
cfg->enable = false;
cfg->is_mcch = false;
// Check for MCCH
if (is_mcch_subframe(cfg, phy_tti)) {
cfg->is_mcch = true;
return true;
}
// Not MCCH, check for MCH
if (sib13_configured) {
srsran::mbsfn_sf_cfg_t& subfr_cnfg = mbsfn_config.mbsfn_subfr_cnfg;
srsran::mbsfn_area_info_t& area_info = mbsfn_config.mbsfn_area_info;
offset = subfr_cnfg.radioframe_alloc_offset;
period = srsran::enum_to_number(subfr_cnfg.radioframe_alloc_period);
if (period == (uint8_t)-1) {
return false;
}
if (subfr_cnfg.nof_alloc_subfrs == srsran::mbsfn_sf_cfg_t::sf_alloc_type_t::one_frame) {
if ((sfn % period == offset) && (mch_table[sf] > 0)) {
cfg->mbsfn_area_id = area_info.mbsfn_area_id;
cfg->non_mbsfn_region_length = enum_to_number(area_info.non_mbsfn_region_len);
if (mcch_configured) {
// Iterate through PMCH configs to see which one applies in the current frame
srsran::mcch_msg_t& mcch = mbsfn_config.mcch;
uint32_t mbsfn_per_frame =
mcch.pmch_info_list[0].sf_alloc_end / enum_to_number(mcch.pmch_info_list[0].mch_sched_period);
uint32_t frame_alloc_idx = sfn % enum_to_number(mcch.common_sf_alloc_period);
uint32_t sf_alloc_idx = frame_alloc_idx * mbsfn_per_frame + ((sf < 4) ? sf - 1 : sf - 3);
std::unique_lock<std::mutex> lock(mtch_mutex);
while (!have_mtch_stop) {
mtch_cvar.wait(lock);
}
lock.unlock();
for (uint32_t i = 0; i < mcch.nof_pmch_info; i++) {
if (sf_alloc_idx <= mch_period_stop) {
// trigger conditional variable, has ot be untriggered by mtch stop location
cfg->mbsfn_mcs = mcch.pmch_info_list[i].data_mcs;
cfg->enable = true;
} else {
// have_mtch_stop = false;
}
}
Debug("MCH subframe TTI:%d", phy_tti);
}
return true;
}
} else if (subfr_cnfg.nof_alloc_subfrs == srsran::mbsfn_sf_cfg_t::sf_alloc_type_t::four_frames) {
uint8_t idx = sfn % period;
if ((idx >= offset) && (idx < offset + 4)) {
if (mch_table[(idx * 10) + sf] > 0) {
cfg->mbsfn_area_id = area_info.mbsfn_area_id;
cfg->non_mbsfn_region_length = enum_to_number(area_info.non_mbsfn_region_len);
// TODO: check for MCCH configuration, set MCS and decode
return true;
}
}
} else {
logger.error("The subframe allocation type is not yet configured");
}
}
return false;
}
bool phy_common::is_mcch_subframe(srsran_mbsfn_cfg_t* cfg, uint32_t phy_tti)
{
uint32_t sfn; // System Frame Number
uint8_t sf; // Subframe
uint8_t offset;
uint16_t period;
sfn = phy_tti / 10;
sf = (uint8_t)(phy_tti % 10);
if (sib13_configured) {
srsran::mbsfn_area_info_t& area_info = mbsfn_config.mbsfn_area_info;
offset = area_info.mcch_cfg.mcch_offset;
period = enum_to_number(area_info.mcch_cfg.mcch_repeat_period);
if ((sfn % period == offset) && mcch_table[sf] > 0) {
cfg->mbsfn_area_id = area_info.mbsfn_area_id;
cfg->non_mbsfn_region_length = enum_to_number(area_info.non_mbsfn_region_len);
cfg->mbsfn_mcs = enum_to_number(area_info.mcch_cfg.sig_mcs);
cfg->enable = true;
have_mtch_stop = false;
Debug("MCCH subframe TTI:%d", phy_tti);
return true;
}
}
return false;
}
bool phy_common::is_mbsfn_sf(srsran_mbsfn_cfg_t* cfg, uint32_t phy_tti)
{
return is_mch_subframe(cfg, phy_tti);
}
} // namespace srsue
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