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precompute nof_re_table[sf][prb][slot][cfi] for faster nof_re computation and for more accurate lower bound nof_re computation

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master
Francisco Paisana 4 years ago
parent d0a17b0a40
commit d4242f2db7
8 changed files with 154 additions and 52 deletions
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2
lib/include/srslte/phy/phch/ra_dl.h
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@ -48,6 +48,8 @@ srslte_ra_dl_grant_to_grant_prb_allocation(const srslte_dci_dl_t* dci, srslte_pd
/** Functions used by the eNodeB scheduler */
SRSLTE_API uint32_t srslte_ra_dl_approx_nof_re(const srslte_cell_t* cell, uint32_t nof_prb, uint32_t nof_ctrl_symbols);
SRSLTE_API uint32_t ra_re_x_prb(const srslte_cell_t* cell, srslte_dl_sf_cfg_t* sf, uint32_t slot, uint32_t prb_idx);
SRSLTE_API uint32_t srslte_ra_dl_grant_nof_re(const srslte_cell_t* cell,
srslte_dl_sf_cfg_t* sf,
srslte_pdsch_grant_t* grant);

7
lib/src/phy/phch/ra_dl.c
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@ -29,13 +29,8 @@ const int tbs_format1c_table[32] = {40, 56, 72, 120, 136, 144, 176, 208
296, 328, 336, 392, 488, 552, 600, 632, 696, 776, 840,
904, 1000, 1064, 1128, 1224, 1288, 1384, 1480, 1608, 1736};
/**********
* STATIC FUNCTIONS
*
**********/
/* Returns the number of RE in a PRB in a slot and subframe */
static uint32_t ra_re_x_prb(const srslte_cell_t* cell, srslte_dl_sf_cfg_t* sf, uint32_t slot, uint32_t prb_idx)
uint32_t ra_re_x_prb(const srslte_cell_t* cell, srslte_dl_sf_cfg_t* sf, uint32_t slot, uint32_t prb_idx)
{
uint32_t subframe = sf->tti % 10;

14
srsenb/hdr/stack/mac/sched_common.h
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@ -47,8 +47,10 @@ public:
const sched_interface::cell_cfg_t& cfg_,
const sched_interface::sched_args_t& sched_args);
// convenience getters
uint32_t prb_to_rbg(uint32_t nof_prbs) const { return srslte::ceil_div(nof_prbs, P); }
uint32_t nof_prbs_to_rbgs(uint32_t nof_prbs) const { return srslte::ceil_div(nof_prbs, P); }
uint32_t nof_prb() const { return cfg.cell.nof_prb; }
uint32_t get_dl_lb_nof_re(tti_point tti_tx_dl, uint32_t nof_prbs_alloc) const;
uint32_t get_dl_nof_res(srslte::tti_point tti_tx_dl, const srslte_dci_dl_t& dci, uint32_t cfi) const;
uint32_t enb_cc_idx = 0;
sched_interface::cell_cfg_t cfg = {};
@ -59,6 +61,16 @@ public:
std::array<uint32_t, 3> nof_cce_table = {}; ///< map cfix -> nof cces in PDCCH
uint32_t P = 0;
uint32_t nof_rbgs = 0;
using dl_nof_re_table = srslte::bounded_vector<
std::array<std::array<std::array<uint32_t, SRSLTE_NOF_CFI>, SRSLTE_NOF_SLOTS_PER_SF>, SRSLTE_NOF_SF_X_FRAME>,
SRSLTE_MAX_PRB>;
using dl_lb_nof_re_table = std::array<srslte::bounded_vector<uint32_t, SRSLTE_MAX_PRB>, SRSLTE_NOF_SF_X_FRAME>;
/// Table of nof REs
dl_nof_re_table nof_re_table;
/// Cached computation of Lower bound of nof REs
dl_lb_nof_re_table nof_re_lb_table;
};
using ue_cce_locations_table = std::array<std::array<sched_dci_cce_t, SRSLTE_NOF_SF_X_FRAME>, SRSLTE_NOF_CFI>;

6
srsenb/hdr/stack/mac/sched_helpers.h
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@ -100,6 +100,12 @@ inline uint32_t count_prb_per_tb(const rbgmask_t& bitmask)
return nof_prb;
}
inline uint32_t count_prb_per_tb_approx(uint32_t nof_rbgs, uint32_t cell_nof_prb)
{
uint32_t P = srslte_ra_type0_P(cell_nof_prb);
return std::min(nof_rbgs * P, cell_nof_prb);
}
ue_cce_locations_table generate_cce_location_table(uint16_t rnti, const sched_cell_params_t& cell_cfg);
/**

8
srsenb/hdr/stack/mac/sched_ue.h
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@ -39,7 +39,7 @@ struct cc_sched_ue {
const static int SCHED_MAX_HARQ_PROC = FDD_HARQ_DELAY_UL_MS + FDD_HARQ_DELAY_DL_MS;
cc_sched_ue(const sched_interface::ue_cfg_t& cfg_,
const sched_cell_params_t& cell_cfg_,
const sched_ue_cell& cell_ue_,
uint16_t rnti_,
uint32_t ue_cc_idx,
srslte::tti_point current_tti);
@ -51,9 +51,9 @@ struct cc_sched_ue {
tbs_info alloc_tbs(uint32_t nof_prb, uint32_t nof_re, uint32_t req_bytes, bool is_ul);
tbs_info alloc_tbs_dl(uint32_t nof_prb, uint32_t nof_re, uint32_t req_bytes);
tbs_info alloc_tbs_ul(uint32_t nof_prb, uint32_t nof_re, uint32_t req_bytes, int explicit_mcs = -1);
int get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_symbols);
int get_required_prb_dl(tti_point tti_tx_dl, uint32_t req_bytes);
uint32_t get_required_prb_ul(uint32_t req_bytes);
const sched_cell_params_t* get_cell_cfg() const { return cell_params; }
const sched_cell_params_t* get_cell_cfg() const { return cell_ue->cell_cfg; }
uint32_t get_ue_cc_idx() const { return ue_cc_idx; }
void set_dl_cqi(tti_point tti_rx, uint32_t dl_cqi);
int cqi_to_tbs(uint32_t nof_prb, uint32_t nof_re, bool is_ul, uint32_t* mcs);
@ -80,7 +80,7 @@ private:
// config
srslte::log_ref log_h;
const sched_interface::ue_cfg_t* cfg = nullptr;
const sched_cell_params_t* cell_params = nullptr;
const sched_ue_cell* cell_ue = nullptr;
uint16_t rnti;
uint32_t ue_cc_idx = 0;
srslte::tti_point cfg_tti;

88
srsenb/src/stack/mac/sched_helpers.cc
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@ -183,6 +183,54 @@ prb_interval prb_interval::riv_to_prbs(uint32_t riv, uint32_t nof_prbs, int nof_
* Sched Params
*******************************************************/
sched_cell_params_t::dl_nof_re_table generate_nof_re_table(const srslte_cell_t& cell)
{
sched_cell_params_t::dl_nof_re_table table(cell.nof_prb);
srslte_dl_sf_cfg_t dl_sf = {};
dl_sf.sf_type = SRSLTE_SF_NORM;
dl_sf.tdd_config.configured = false;
for (uint32_t cfi = 0; cfi < SRSLTE_NOF_CFI; ++cfi) {
dl_sf.cfi = cfi + 1;
for (uint32_t sf_idx = 0; sf_idx < SRSLTE_NOF_SF_X_FRAME; ++sf_idx) {
dl_sf.tti = sf_idx;
for (uint32_t s = 0; s < SRSLTE_NOF_SLOTS_PER_SF; ++s) {
for (uint32_t n = 0; n < cell.nof_prb; ++n) {
table[n][sf_idx][s][cfi] = ra_re_x_prb(&cell, &dl_sf, s, n);
}
}
}
}
return table;
}
sched_cell_params_t::dl_lb_nof_re_table get_lb_nof_re_x_prb(const sched_cell_params_t::dl_nof_re_table& table)
{
sched_cell_params_t::dl_lb_nof_re_table ret;
for (uint32_t sf_idx = 0; sf_idx < SRSLTE_NOF_SF_X_FRAME; ++sf_idx) {
ret[sf_idx].resize(table.size());
srslte::bounded_vector<uint32_t, SRSLTE_MAX_PRB> re_prb_vec(table.size());
for (uint32_t p = 0; p < table.size(); ++p) {
for (uint32_t s = 0; s < SRSLTE_NOF_SLOTS_PER_SF; ++s) {
re_prb_vec[p] += table[p][sf_idx][s][SRSLTE_NOF_CFI - 1];
}
}
srslte::bounded_vector<uint32_t, SRSLTE_MAX_PRB> re_prb_vec2(re_prb_vec);
ret[sf_idx][0] = *std::min_element(re_prb_vec2.begin(), re_prb_vec2.end());
for (uint32_t p = 1; p < table.size(); ++p) {
std::transform(re_prb_vec2.begin(),
re_prb_vec2.end() - 1,
re_prb_vec.begin() + p,
re_prb_vec2.begin(),
std::plus<uint32_t>());
re_prb_vec2.pop_back();
ret[sf_idx][p] = *std::min_element(re_prb_vec2.begin(), re_prb_vec2.end());
}
}
return ret;
}
void sched_cell_params_t::regs_deleter::operator()(srslte_regs_t* p)
{
if (p != nullptr) {
@ -269,9 +317,49 @@ bool sched_cell_params_t::set_cfg(uint32_t enb_cc_id
P = srslte_ra_type0_P(cfg.cell.nof_prb);
nof_rbgs = srslte::ceil_div(cfg.cell.nof_prb, P);
nof_re_table = generate_nof_re_table(cfg.cell);
nof_re_lb_table = get_lb_nof_re_x_prb(nof_re_table);
return true;
}
uint32_t sched_cell_params_t::get_dl_lb_nof_re(tti_point tti_tx_dl, uint32_t nof_prbs_alloc) const
{
assert(nof_prbs_alloc <= nof_prb());
if (nof_prbs_alloc == 0) {
return 0;
}
uint32_t sf_idx = tti_tx_dl.sf_idx();
uint32_t nof_re = nof_re_lb_table[sf_idx][nof_prbs_alloc - 1];
// sanity check
assert(nof_re <= srslte_ra_dl_approx_nof_re(&cfg.cell, nof_prbs_alloc, SRSLTE_NOF_CFI));
return nof_re;
}
uint32_t
sched_cell_params_t::get_dl_nof_res(srslte::tti_point tti_tx_dl, const srslte_dci_dl_t& dci, uint32_t cfi) const
{
srslte_pdsch_grant_t grant = {};
srslte_dl_sf_cfg_t dl_sf = {};
dl_sf.cfi = cfi;
dl_sf.tti = tti_tx_dl.to_uint();
srslte_ra_dl_grant_to_grant_prb_allocation(&dci, &grant, nof_prb());
uint32_t nof_re = 0;
for (uint32_t p = 0; p < nof_prb(); ++p) {
for (uint32_t s = 0; s < SRSLTE_NOF_SLOTS_PER_SF; ++s) {
if (grant.prb_idx[s][p]) {
nof_re += nof_re_table[p][tti_tx_dl.sf_idx()][s][cfi - 1];
}
}
}
// sanity check
assert(nof_re == srslte_ra_dl_grant_nof_re(&cfg.cell, &dl_sf, &grant));
return nof_re;
}
ue_cce_locations_table generate_cce_location_table(uint16_t rnti, const sched_cell_params_t& cell_cfg)
{
ue_cce_locations_table dci_locations;

66
srsenb/src/stack/mac/sched_ue.cc
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@ -149,10 +149,10 @@ void sched_ue::set_cfg(const ue_cfg_t& cfg_)
if (ue_idx >= prev_supported_cc_list.size()) {
// New carrier needs to be added
carriers.emplace_back(cfg, *cells[cc_cfg.enb_cc_idx].cell_cfg, rnti, ue_idx, current_tti);
carriers.emplace_back(cfg, cells[cc_cfg.enb_cc_idx], rnti, ue_idx, current_tti);
} else if (cc_cfg.enb_cc_idx != prev_supported_cc_list[ue_idx].enb_cc_idx) {
// One carrier was added in the place of another
carriers[ue_idx] = cc_sched_ue{cfg, *cells[cc_cfg.enb_cc_idx].cell_cfg, rnti, ue_idx, current_tti};
carriers[ue_idx] = cc_sched_ue{cfg, cells[cc_cfg.enb_cc_idx], rnti, ue_idx, current_tti};
if (ue_idx == 0) {
log_h->info("SCHED: rnti=0x%x PCell is now enb_cc_idx=%d.\n", rnti, cc_cfg.enb_cc_idx);
}
@ -558,12 +558,7 @@ tbs_info sched_ue::compute_mcs_and_tbs(uint32_t ue_cc_idx,
srslte::interval<uint32_t> req_bytes = get_requested_dl_bytes(ue_cc_idx);
// Calculate exact number of RE for this PRB allocation
srslte_pdsch_grant_t grant = {};
srslte_dl_sf_cfg_t dl_sf = {};
dl_sf.cfi = cfi;
dl_sf.tti = tti_tx_dl.to_uint();
srslte_ra_dl_grant_to_grant_prb_allocation(&dci, &grant, carriers[ue_cc_idx].get_cell_cfg()->nof_prb());
uint32_t nof_re = srslte_ra_dl_grant_nof_re(&carriers[ue_cc_idx].get_cell_cfg()->cfg.cell, &dl_sf, &grant);
uint32_t nof_re = carriers[ue_cc_idx].get_cell_cfg()->get_dl_nof_res(tti_tx_dl, dci, cfi);
// Compute MCS+TBS
tbs_info tb = carriers[ue_cc_idx].alloc_tbs_dl(nof_alloc_prbs, nof_re, req_bytes.stop());
@ -832,8 +827,7 @@ rbg_interval sched_ue::get_required_dl_rbgs(uint32_t ue_cc_idx)
return {0, 0};
}
const auto* cellparams = carriers[ue_cc_idx].get_cell_cfg();
int pending_prbs =
carriers[ue_cc_idx].get_required_prb_dl(req_bytes.start(), cellparams->sched_cfg->max_nof_ctrl_symbols);
int pending_prbs = carriers[ue_cc_idx].get_required_prb_dl(to_tx_dl(current_tti), req_bytes.start());
if (pending_prbs < 0) {
// Cannot fit allocation in given PRBs
log_h->error("SCHED: DL CQI=%d does now allow fitting %d non-segmentable DL tx bytes into the cell bandwidth. "
@ -842,10 +836,10 @@ rbg_interval sched_ue::get_required_dl_rbgs(uint32_t ue_cc_idx)
req_bytes.start());
return {cellparams->nof_prb(), cellparams->nof_prb()};
}
uint32_t min_pending_rbg = cellparams->prb_to_rbg(pending_prbs);
pending_prbs = carriers[ue_cc_idx].get_required_prb_dl(req_bytes.stop(), cellparams->sched_cfg->max_nof_ctrl_symbols);
uint32_t min_pending_rbg = cellparams->nof_prbs_to_rbgs(pending_prbs);
pending_prbs = carriers[ue_cc_idx].get_required_prb_dl(to_tx_dl(current_tti), req_bytes.stop());
pending_prbs = (pending_prbs < 0) ? cellparams->nof_prb() : pending_prbs;
uint32_t max_pending_rbg = cellparams->prb_to_rbg(pending_prbs);
uint32_t max_pending_rbg = cellparams->nof_prbs_to_rbgs(pending_prbs);
return {min_pending_rbg, max_pending_rbg};
}
@ -923,11 +917,8 @@ uint32_t sched_ue::get_pending_dl_rlc_data() const
uint32_t sched_ue::get_expected_dl_bitrate(uint32_t ue_cc_idx, int nof_rbgs) const
{
const cc_sched_ue* cc = &carriers[ue_cc_idx];
auto* cell_cfg = carriers[ue_cc_idx].get_cell_cfg();
uint32_t nof_prbs_alloc = nof_rbgs < 0 ? cell_cfg->nof_prb() : std::min(nof_rbgs * cell_cfg->P, cell_cfg->nof_prb());
uint32_t nof_re =
srslte_ra_dl_approx_nof_re(&cell_cfg->cfg.cell, nof_prbs_alloc, cell_cfg->sched_cfg->max_nof_ctrl_symbols);
uint32_t nof_re = cc->get_cell_cfg()->get_dl_lb_nof_re(
to_tx_dl(current_tti), count_prb_per_tb_approx(nof_rbgs, cc->get_cell_cfg()->nof_prb()));
float max_coderate = srslte_cqi_to_coderate(std::min(cc->dl_cqi + 1u, 15u), cfg.use_tbs_index_alt);
// Inverse of srslte_coderate(tbs, nof_re)
@ -1227,27 +1218,29 @@ int cc_sched_ue::cqi_to_tbs(uint32_t nof_prb, uint32_t nof_re, bool is_ul, uint3
***********************************************************************************************/
cc_sched_ue::cc_sched_ue(const sched_interface::ue_cfg_t& cfg_,
const sched_cell_params_t& cell_cfg_,
const sched_ue_cell& cell_ue_,
uint16_t rnti_,
uint32_t ue_cc_idx_,
tti_point current_tti) :
cell_params(&cell_cfg_),
cell_ue(&cell_ue_),
rnti(rnti_),
log_h(srslte::logmap::get("MAC")),
ue_cc_idx(ue_cc_idx_),
last_tti(current_tti),
harq_ent(SCHED_MAX_HARQ_PROC, SCHED_MAX_HARQ_PROC),
tpc_fsm(cell_cfg_.nof_prb(), cell_cfg_.cfg.target_ul_sinr, cell_cfg_.cfg.enable_phr_handling)
tpc_fsm(cell_ue_.cell_cfg->nof_prb(),
cell_ue_.cell_cfg->cfg.target_ul_sinr,
cell_ue_.cell_cfg->cfg.enable_phr_handling)
{
dl_cqi_rx = false;
dl_cqi = (ue_cc_idx == 0) ? cell_params->cfg.initial_dl_cqi : 0;
dl_cqi = (ue_cc_idx == 0) ? cell_ue_.cell_cfg->cfg.initial_dl_cqi : 0;
set_cfg(cfg_);
max_aggr_level = cell_params->sched_cfg->max_aggr_level >= 0 ? cell_params->sched_cfg->max_aggr_level : 3;
max_aggr_level = cell_ue->cell_cfg->sched_cfg->max_aggr_level >= 0 ? cell_ue->cell_cfg->sched_cfg->max_aggr_level : 3;
// set fixed mcs
fixed_mcs_dl = cell_params->sched_cfg->pdsch_mcs;
fixed_mcs_ul = cell_params->sched_cfg->pusch_mcs;
fixed_mcs_dl = cell_ue->cell_cfg->sched_cfg->pdsch_mcs;
fixed_mcs_ul = cell_ue->cell_cfg->sched_cfg->pusch_mcs;
}
void cc_sched_ue::reset()
@ -1269,12 +1262,13 @@ void cc_sched_ue::set_cfg(const sched_interface::ue_cfg_t& cfg_)
cfg_tti = last_tti;
// set max mcs
max_mcs_ul = cell_params->sched_cfg->pusch_max_mcs >= 0 ? cell_params->sched_cfg->pusch_max_mcs : 28u;
if (cell_params->cfg.enable_64qam) {
max_mcs_ul = get_cell_cfg()->sched_cfg->pusch_max_mcs >= 0 ? get_cell_cfg()->sched_cfg->pusch_max_mcs : 28u;
if (get_cell_cfg()->cfg.enable_64qam) {
const uint32_t max_64qam_mcs[] = {20, 24, 28};
max_mcs_ul = std::min(max_mcs_ul, max_64qam_mcs[(size_t)cfg->support_ul64qam]);
}
max_mcs_dl = cell_params->sched_cfg->pdsch_max_mcs >= 0 ? std::min(cell_params->sched_cfg->pdsch_max_mcs, 28) : 28u;
max_mcs_dl =
get_cell_cfg()->sched_cfg->pdsch_max_mcs >= 0 ? std::min(get_cell_cfg()->sched_cfg->pdsch_max_mcs, 28) : 28u;
if (cfg->use_tbs_index_alt) {
max_mcs_dl = std::min(max_mcs_dl, 27u);
}
@ -1325,7 +1319,7 @@ void cc_sched_ue::finish_tti(tti_point tti_rx)
uint32_t cc_sched_ue::get_aggr_level(uint32_t nof_bits)
{
return srsenb::get_aggr_level(nof_bits, dl_cqi, max_aggr_level, cell_params->nof_prb(), cfg->use_tbs_index_alt);
return srsenb::get_aggr_level(nof_bits, dl_cqi, max_aggr_level, get_cell_cfg()->nof_prb(), cfg->use_tbs_index_alt);
}
/* In this scheduler we tend to use all the available bandwidth and select the MCS
@ -1407,16 +1401,16 @@ tbs_info cc_sched_ue::alloc_tbs_ul(uint32_t nof_prb, uint32_t nof_re, uint32_t r
return ret;
}
int cc_sched_ue::get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_symbols)
int cc_sched_ue::get_required_prb_dl(tti_point tti_tx_dl, uint32_t req_bytes)
{
auto compute_tbs_approx = [this, nof_ctrl_symbols](uint32_t nof_prb) {
uint32_t nof_re = srslte_ra_dl_approx_nof_re(&cell_params->cfg.cell, nof_prb, nof_ctrl_symbols);
auto compute_tbs_approx = [tti_tx_dl, this](uint32_t nof_prb) {
uint32_t nof_re = cell_ue->cell_cfg->get_dl_lb_nof_re(tti_tx_dl, nof_prb);
tbs_info tb = alloc_tbs_dl(nof_prb, nof_re, 0);
return tb.tbs_bytes;
};
std::tuple<uint32_t, int, uint32_t, int> ret = false_position_method(
1u, cell_params->nof_prb(), (int)req_bytes, compute_tbs_approx, [](int y) { return y == SRSLTE_ERROR; });
1u, get_cell_cfg()->nof_prb(), (int)req_bytes, compute_tbs_approx, [](int y) { return y == SRSLTE_ERROR; });
int upper_tbs = std::get<3>(ret);
uint32_t upper_nprb = std::get<2>(ret);
return (upper_tbs < 0) ? 0 : ((upper_tbs < (int)req_bytes) ? -1 : upper_nprb);
@ -1429,17 +1423,17 @@ uint32_t cc_sched_ue::get_required_prb_ul(uint32_t req_bytes)
}
auto compute_tbs_approx = [this](uint32_t nof_prb) {
const uint32_t N_srs = 0;
uint32_t nof_re = (2 * (SRSLTE_CP_NSYMB(cell_params->cfg.cell.cp) - 1) - N_srs) * nof_prb * SRSLTE_NRE;
uint32_t nof_re = (2 * (SRSLTE_CP_NSYMB(get_cell_cfg()->cfg.cell.cp) - 1) - N_srs) * nof_prb * SRSLTE_NRE;
return alloc_tbs_ul(nof_prb, nof_re, 0).tbs_bytes;
};
// find nof prbs that lead to a tbs just above req_bytes
int target_tbs = req_bytes + 4;
uint32_t max_prbs = std::min(tpc_fsm.max_ul_prbs(), cell_params->nof_prb());
uint32_t max_prbs = std::min(tpc_fsm.max_ul_prbs(), get_cell_cfg()->nof_prb());
std::tuple<uint32_t, int, uint32_t, int> ret =
false_position_method(1u, max_prbs, target_tbs, compute_tbs_approx, [](int y) { return y == SRSLTE_ERROR; });
uint32_t req_prbs = std::get<2>(ret);
while (!srslte_dft_precoding_valid_prb(req_prbs) && req_prbs < cell_params->nof_prb()) {
while (!srslte_dft_precoding_valid_prb(req_prbs) && req_prbs < get_cell_cfg()->nof_prb()) {
req_prbs++;
}
return req_prbs;

5
srsenb/src/stack/mac/sched_ue_ctrl/sched_ue_cell.cc
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@ -12,9 +12,14 @@
#include "srsenb/hdr/stack/mac/sched_ue_ctrl/sched_ue_cell.h"
#include "srsenb/hdr/stack/mac/sched_helpers.h"
#include <numeric>
namespace srsenb {
/*******************************************************
* sched_ue_cell
*******************************************************/
sched_ue_cell::sched_ue_cell(uint16_t rnti_, const sched_cell_params_t& cell_cfg_) :
rnti(rnti_), cell_cfg(&cell_cfg_), dci_locations(generate_cce_location_table(rnti_, cell_cfg_))
{}

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