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Allowing any PUSCH MCS

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master
Ismael Gomez 7 years ago
parent fabeca49c7
commit 58aecf818d
6 changed files with 55 additions and 23 deletions
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2
srsenb/enb.conf.example
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@ -121,7 +121,7 @@ enable = false
#pdsch_mcs = -1
#pdsch_max_mcs = -1
#pusch_mcs = -1
pusch_max_mcs = 16
#pusch_max_mcs = -1
nof_ctrl_symbols = 2
#####################################################################

6
srsenb/hdr/mac/scheduler_ue.h
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@ -131,8 +131,10 @@ private:
int alloc_pdu(int tbs, sched_interface::dl_sched_pdu_t* pdu);
static uint32_t format1_count_prb(uint32_t bitmask, uint32_t cell_nof_prb);
static int cqi_to_tbs(uint32_t cqi, uint32_t nof_prb, uint32_t nof_re, uint32_t max_mcs, uint32_t *mcs);
static int alloc_tbs(uint32_t cqi, uint32_t nof_prb, uint32_t nof_re, uint32_t req_bytes, uint32_t max_mcs, int *mcs);
static int cqi_to_tbs(uint32_t cqi, uint32_t nof_prb, uint32_t nof_re, uint32_t max_mcs, uint32_t max_Qm, uint32_t *mcs);
int alloc_tbs_dl(uint32_t nof_prb, uint32_t nof_re, uint32_t req_bytes, int *mcs);
int alloc_tbs_ul(uint32_t nof_prb, uint32_t nof_re, uint32_t req_bytes, int *mcs);
int alloc_tbs(uint32_t nof_prb, uint32_t nof_re, uint32_t req_bytes, bool is_ul, int *mcs);
static bool bearer_is_ul(ue_bearer_t *lch);
static bool bearer_is_dl(ue_bearer_t *lch);

2
srsenb/sib.conf.example
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@ -60,7 +60,7 @@ sib2 =
n_sb = 1;
hopping_mode = "inter-subframe";
pusch_hopping_offset = 2;
enable_64_qam = false;
enable_64_qam = false; // 64QAM PUSCH is not currently enabled
ul_rs =
{
cyclic_shift = 0;

52
srsenb/src/mac/scheduler_ue.cc
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@ -395,7 +395,7 @@ int sched_ue::generate_format1(dl_harq_proc *h,
uint32_t nof_ctrl_symbols = cfi+(cell.nof_prb<10?1:0);
uint32_t nof_re = srslte_ra_dl_grant_nof_re(&grant, cell, sf_idx, nof_ctrl_symbols);
if (fixed_mcs_dl < 0) {
tbs = alloc_tbs(dl_cqi, nof_prb, nof_re, req_bytes, max_mcs_dl, &mcs);
tbs = alloc_tbs_dl(nof_prb, nof_re, req_bytes, &mcs);
} else {
tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_dl), nof_prb);
mcs = fixed_mcs_dl;
@ -466,7 +466,7 @@ int sched_ue::generate_format0(ul_harq_proc *h,
uint32_t N_srs = 0;
uint32_t nof_re = (2*(SRSLTE_CP_NSYMB(cell.cp)-1) - N_srs)*allocation.L*SRSLTE_NRE;
if (fixed_mcs_ul < 0) {
tbs = alloc_tbs(ul_cqi, allocation.L, nof_re, req_bytes, max_mcs_ul, &mcs);
tbs = alloc_tbs_ul(allocation.L, nof_re, req_bytes, &mcs);
} else {
tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_ul), allocation.L);
mcs = fixed_mcs_ul;
@ -610,7 +610,7 @@ uint32_t sched_ue::get_required_prb_dl(uint32_t req_bytes, uint32_t nof_ctrl_sym
for (n=1;n<cell.nof_prb && nbytes < req_bytes;n++) {
nof_re = srslte_ra_dl_approx_nof_re(cell, n, nof_ctrl_symbols);
if (fixed_mcs_dl < 0) {
tbs = alloc_tbs(dl_cqi, n, nof_re, 0, max_mcs_dl, &mcs);
tbs = alloc_tbs_dl(n, nof_re, 0, &mcs);
} else {
tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_dl), n);
}
@ -639,7 +639,7 @@ uint32_t sched_ue::get_required_prb_ul(uint32_t req_bytes)
uint32_t nof_re = (2*(SRSLTE_CP_NSYMB(cell.cp)-1) - N_srs)*n*SRSLTE_NRE;
int tbs = 0;
if (fixed_mcs_ul < 0) {
tbs = alloc_tbs(ul_cqi, n, nof_re, 0, max_mcs_ul, &mcs);
tbs = alloc_tbs_ul(n, nof_re, 0, &mcs);
} else {
tbs = srslte_ra_tbs_from_idx(srslte_ra_tbs_idx_from_mcs(fixed_mcs_ul), n);
}
@ -760,10 +760,12 @@ uint32_t sched_ue::format1_count_prb(uint32_t bitmask, uint32_t cell_nof_prb) {
return nof_prb;
}
int sched_ue::cqi_to_tbs(uint32_t cqi, uint32_t nof_prb, uint32_t nof_re, uint32_t max_mcs, uint32_t *mcs) {
int sched_ue::cqi_to_tbs(uint32_t cqi, uint32_t nof_prb, uint32_t nof_re, uint32_t max_mcs, uint32_t max_Qm, uint32_t *mcs) {
float max_coderate = srslte_cqi_to_coderate(cqi);
int sel_mcs = max_mcs+1;
float coderate = 99;
float eff_coderate = 99;
uint32_t Qm = 1;
int tbs = 0;
do {
@ -771,25 +773,47 @@ int sched_ue::cqi_to_tbs(uint32_t cqi, uint32_t nof_prb, uint32_t nof_re, uint32
uint32_t tbs_idx = srslte_ra_tbs_idx_from_mcs(sel_mcs);
tbs = srslte_ra_tbs_from_idx(tbs_idx, nof_prb);
coderate = srslte_coderate(tbs, nof_re);
} while(sel_mcs > 0 && coderate >= max_coderate);
Qm = SRSLTE_MIN(max_Qm, srslte_mod_bits_x_symbol(srslte_ra_mod_from_mcs(sel_mcs)));
eff_coderate = coderate/Qm;
} while((sel_mcs > 0 && coderate > max_coderate) || eff_coderate > 0.930);
if (mcs) {
*mcs = (uint32_t) sel_mcs;
}
return tbs;
}
/* In this scheduler we tend to use all the available bandwidth and select the MCS
int sched_ue::alloc_tbs_dl(uint32_t nof_prb,
uint32_t nof_re,
uint32_t req_bytes,
int *mcs)
{
return alloc_tbs(nof_prb, nof_re, req_bytes, false, mcs);
}
int sched_ue::alloc_tbs_ul(uint32_t nof_prb,
uint32_t nof_re,
uint32_t req_bytes,
int *mcs)
{
return alloc_tbs(nof_prb, nof_re, req_bytes, true, mcs);
}
/* In this scheduler we tend to use all the available bandwidth and select the MCS
* that approximates the minimum between the capacity and the requested rate
*/
int sched_ue::alloc_tbs(uint32_t cqi,
uint32_t nof_prb,
uint32_t nof_re,
uint32_t req_bytes,
uint32_t max_mcs,
int *mcs)
int sched_ue::alloc_tbs(uint32_t nof_prb,
uint32_t nof_re,
uint32_t req_bytes,
bool is_ul,
int *mcs)
{
uint32_t sel_mcs = 0;
int tbs = cqi_to_tbs(cqi, nof_prb, nof_re, max_mcs, &sel_mcs)/8;
uint32_t cqi = is_ul?ul_cqi:dl_cqi;
uint32_t max_mcs = is_ul?max_mcs_ul:max_mcs_dl;
uint32_t max_Qm = is_ul?4:6; // Allow 16-QAM in PUSCH Only
int tbs = cqi_to_tbs(cqi, nof_prb, nof_re, max_mcs, max_Qm, &sel_mcs)/8;
/* If less bytes are requested, lower the MCS */
if (tbs > (int) req_bytes && req_bytes > 0) {

2
srsenb/src/main.cc
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@ -130,7 +130,7 @@ void parse_args(all_args_t *args, int argc, char* argv[]) {
bpo::value<int>(&args->expert.mac.sched.pusch_mcs)->default_value(-1),
"Optional fixed PUSCH MCS (ignores reported CQIs if specified)")
("scheduler.pusch_max_mcs",
bpo::value<int>(&args->expert.mac.sched.pusch_max_mcs)->default_value(16),
bpo::value<int>(&args->expert.mac.sched.pusch_max_mcs)->default_value(-1),
"Optional PUSCH MCS limit")
("scheduler.nof_ctrl_symbols",
bpo::value<int>(&args->expert.mac.sched.nof_ctrl_symbols)->default_value(3),

6
srsenb/src/phy/phch_worker.cc
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@ -49,6 +49,8 @@ using namespace std;
#ifdef ENABLE_GUI
#include "srsgui/srsgui.h"
#include <semaphore.h>
#include <srslte/phy/phch/ra.h>
void init_plots(srsenb::phch_worker *worker);
pthread_t plot_thread;
sem_t plot_sem;
@ -363,6 +365,10 @@ int phch_worker::decode_pusch(srslte_enb_ul_pusch_t *grants, uint32_t nof_pusch,
srslte_ra_ul_grant_t phy_grant;
int res = -1;
if (!srslte_ra_ul_dci_to_grant(&grants[i].grant, enb_ul.cell.nof_prb, n_rb_ho, &phy_grant, tti%8)) {
if (phy_grant.mcs.mod == SRSLTE_MOD_64QAM) {
phy_grant.mcs.mod = SRSLTE_MOD_16QAM;
}
phy_grant.Qm = SRSLTE_MIN(phy_grant.Qm, 4);
res = srslte_enb_ul_get_pusch(&enb_ul, &phy_grant, grants[i].softbuffer,
rnti, grants[i].rv_idx,
grants[i].current_tx_nb,

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