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srsLTE
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add configurable fairness parameter to pf scheduler

This commit is contained in:
Francisco Paisana 2021-01-07 18:10:24 +00:00
parent ffe513415c
commit ea8ad153c4
7 changed files with 29 additions and 18 deletions
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1
lib/include/srslte/interfaces/sched_interface.h
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@ -46,6 +46,7 @@ public:
struct sched_args_t {
std::string sched_policy = "time_pf";
std::string sched_policy_args = "2";
int pdsch_mcs = -1;
int pdsch_max_mcs = 28;
int pusch_mcs = -1;

8
srsenb/hdr/stack/mac/schedulers/sched_time_pf.h
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@ -23,19 +23,20 @@ class sched_time_pf final : public sched_base
using ue_cit_t = std::map<uint16_t, sched_ue>::const_iterator;
public:
sched_time_pf(const sched_cell_params_t& cell_params_);
sched_time_pf(const sched_cell_params_t& cell_params_, const sched_interface::sched_args_t& sched_args);
void sched_dl_users(std::map<uint16_t, sched_ue>& ue_db, sf_sched* tti_sched) override;
void sched_ul_users(std::map<uint16_t, sched_ue>& ue_db, sf_sched* tti_sched) override;
private:
void new_tti(std::map<uint16_t, sched_ue>& ue_db, sf_sched* tti_sched);
const sched_cell_params_t* cc_cfg = nullptr;
const sched_cell_params_t* cc_cfg = nullptr;
float fairness_coeff = 1;
srslte::tti_point current_tti_rx;
struct ue_ctxt {
ue_ctxt(uint16_t rnti_) : rnti(rnti_) {}
ue_ctxt(uint16_t rnti_, float fairness_coeff_) : rnti(rnti_), fairness_coeff(fairness_coeff_) {}
float dl_avg_rate() const { return dl_nof_samples == 0 ? 0 : dl_avg_rate_; }
float ul_avg_rate() const { return ul_nof_samples == 0 ? 0 : ul_avg_rate_; }
uint32_t dl_count() const { return dl_nof_samples; }
@ -45,6 +46,7 @@ private:
void save_ul_alloc(uint32_t alloc_bytes, float alpha);
const uint16_t rnti;
const float fairness_coeff;
int ue_cc_idx = 0;
float dl_prio = 0;

2
srsenb/hdr/stack/mac/schedulers/sched_time_rr.h
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@ -22,7 +22,7 @@ class sched_time_rr final : public sched_base
const static int MAX_RBG = 25;
public:
sched_time_rr(const sched_cell_params_t& cell_params_);
sched_time_rr(const sched_cell_params_t& cell_params_, const sched_interface::sched_args_t& sched_args);
void sched_dl_users(std::map<uint16_t, sched_ue>& ue_db, sf_sched* tti_sched) override;
void sched_ul_users(std::map<uint16_t, sched_ue>& ue_db, sf_sched* tti_sched) override;

1
srsenb/src/main.cc
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@ -133,6 +133,7 @@ void parse_args(all_args_t* args, int argc, char* argv[])
/* Scheduling section */
("scheduler.policy", bpo::value<string>(&args->stack.mac.sched.sched_policy)->default_value("time_pf"), "DL and UL data scheduling policy (E.g. time_rr, time_pf)")
("scheduler.policy_args", bpo::value<string>(&args->stack.mac.sched.sched_policy_args)->default_value("2"), "Scheduler policy-specific arguments")
("scheduler.pdsch_mcs", bpo::value<int>(&args->stack.mac.sched.pdsch_mcs)->default_value(-1), "Optional fixed PDSCH MCS (ignores reported CQIs if specified)")
("scheduler.pdsch_max_mcs", bpo::value<int>(&args->stack.mac.sched.pdsch_max_mcs)->default_value(-1), "Optional PDSCH MCS limit")
("scheduler.pusch_mcs", bpo::value<int>(&args->stack.mac.sched.pusch_mcs)->default_value(-1), "Optional fixed PUSCH MCS (ignores reported CQIs if specified)")

4
srsenb/src/stack/mac/sched_carrier.cc
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@ -289,10 +289,10 @@ void sched::carrier_sched::carrier_cfg(const sched_cell_params_t& cell_params_)
// Setup data scheduling algorithms
if (cell_params_.sched_cfg->sched_policy == "time_rr") {
sched_algo.reset(new sched_time_rr{*cc_cfg});
sched_algo.reset(new sched_time_rr{*cc_cfg, *cell_params_.sched_cfg});
log_h->info("Using time-domain RR scheduling policy for cc=%d\n", cc_cfg->enb_cc_idx);
} else {
sched_algo.reset(new sched_time_pf{*cc_cfg});
sched_algo.reset(new sched_time_pf{*cc_cfg, *cell_params_.sched_cfg});
log_h->info("Using time-domain PF scheduling policy for cc=%d\n", cc_cfg->enb_cc_idx);
}

21
srsenb/src/stack/mac/schedulers/sched_time_pf.cc
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@ -16,9 +16,12 @@ namespace srsenb {
using srslte::tti_point;
sched_time_pf::sched_time_pf(const sched_cell_params_t& cell_params_)
sched_time_pf::sched_time_pf(const sched_cell_params_t& cell_params_, const sched_interface::sched_args_t& sched_args)
{
cc_cfg = &cell_params_;
if (not sched_args.sched_policy_args.empty()) {
fairness_coeff = std::stof(sched_args.sched_policy_args);
}
}
void sched_time_pf::new_tti(std::map<uint16_t, sched_ue>& ue_db, sf_sched* tti_sched)
@ -36,7 +39,7 @@ void sched_time_pf::new_tti(std::map<uint16_t, sched_ue>& ue_db, sf_sched* tti_s
for (auto& u : ue_db) {
auto it = ue_history_db.find(u.first);
if (it == ue_history_db.end()) {
it = ue_history_db.insert(std::make_pair(u.first, ue_ctxt{u.first})).first;
it = ue_history_db.insert(std::make_pair(u.first, ue_ctxt{u.first, fairness_coeff})).first;
}
it->second.new_tti(*cc_cfg, u.second, tti_sched);
if (it->second.dl_newtx_h != nullptr or it->second.dl_retx_h != nullptr) {
@ -162,7 +165,7 @@ void sched_time_pf::ue_ctxt::new_tti(const sched_cell_params_t& cell, sched_ue&
// calculate DL PF priority
float r = ue.get_expected_dl_bitrate(ue_cc_idx) / 8;
float R = dl_avg_rate();
dl_prio = (R != 0) ? r / R : (r == 0 ? 0 : std::numeric_limits<float>::max());
dl_prio = (R != 0) ? pow(r, fairness_coeff) / R : (r == 0 ? 0 : std::numeric_limits<float>::max());
}
// Calculate UL priority
@ -177,24 +180,24 @@ void sched_time_pf::ue_ctxt::new_tti(const sched_cell_params_t& cell, sched_ue&
}
}
void sched_time_pf::ue_ctxt::save_dl_alloc(uint32_t alloc_bytes, float alpha)
void sched_time_pf::ue_ctxt::save_dl_alloc(uint32_t alloc_bytes, float exp_avg_alpha)
{
if (dl_nof_samples < 1 / alpha) {
if (dl_nof_samples < 1 / exp_avg_alpha) {
// fast start
dl_avg_rate_ = dl_avg_rate_ + (alloc_bytes - dl_avg_rate_) / (dl_nof_samples + 1);
} else {
dl_avg_rate_ = (1 - alpha) * dl_avg_rate_ + (alpha)*alloc_bytes;
dl_avg_rate_ = (1 - exp_avg_alpha) * dl_avg_rate_ + (exp_avg_alpha)*alloc_bytes;
}
dl_nof_samples++;
}
void sched_time_pf::ue_ctxt::save_ul_alloc(uint32_t alloc_bytes, float alpha)
void sched_time_pf::ue_ctxt::save_ul_alloc(uint32_t alloc_bytes, float exp_avg_alpha)
{
if (ul_nof_samples < 1 / alpha) {
if (ul_nof_samples < 1 / exp_avg_alpha) {
// fast start
ul_avg_rate_ = ul_avg_rate_ + (alloc_bytes - ul_avg_rate_) / (ul_nof_samples + 1);
} else {
ul_avg_rate_ = (1 - alpha) * ul_avg_rate_ + (alpha)*alloc_bytes;
ul_avg_rate_ = (1 - exp_avg_alpha) * ul_avg_rate_ + (exp_avg_alpha)*alloc_bytes;
}
ul_nof_samples++;
}

10
srsenb/src/stack/mac/schedulers/sched_time_rr.cc
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@ -15,7 +15,7 @@
namespace srsenb {
sched_time_rr::sched_time_rr(const sched_cell_params_t& cell_params_)
sched_time_rr::sched_time_rr(const sched_cell_params_t& cell_params_, const sched_interface::sched_args_t& sched_args)
{
cc_cfg = &cell_params_;
}
@ -65,9 +65,13 @@ void sched_time_rr::sched_dl_newtxs(std::map<uint16_t, sched_ue>& ue_db, sf_sche
if (iter == ue_db.end()) {
iter = ue_db.begin(); // wrap around
}
sched_ue& user = iter->second;
sched_ue& user = iter->second;
int ue_cc_idx = user.enb_to_ue_cc_idx(cc_cfg->enb_cc_idx);
if (ue_cc_idx < 0) {
continue;
}
const dl_harq_proc* h = get_dl_newtx_harq(user, tti_sched);
rbg_interval req_rbgs = user.get_required_dl_rbgs(user.enb_to_ue_cc_idx(cc_cfg->enb_cc_idx));
rbg_interval req_rbgs = user.get_required_dl_rbgs(ue_cc_idx);
// Check if there is an empty harq for the newtx
if (h == nullptr or req_rbgs.stop() == 0) {
continue;