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allocate only necessary amount of RBs

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This commit is contained in:
Robert Schmidt
2020-09-30 14:52:59 +02:00
parent 0c61983196
commit b7b32fbe77
1 changed files with 21 additions and 20 deletions
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openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_dlsch.c
+21 -20
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@@ -552,35 +552,36 @@ void nr_simple_dlsch_preprocessor(module_id_t module_id,
// Time-domain allocation
sched_ctrl->time_domain_allocation = 2;
// Freq-demain allocation
while (rbStart < bwpSize && vrb_map[rbStart]) rbStart++;
int rbSize = 1;
while (rbStart + rbSize < bwpSize && !vrb_map[rbStart + rbSize]) rbSize++;
DevAssert(rbSize >= 3); /* just ensure we have at least 3 RBs */
sched_ctrl->rbSize = rbSize;
sched_ctrl->rbStart = rbStart;
// modulation scheme
sched_ctrl->mcsTableIdx = 0;
sched_ctrl->mcs = 9;
sched_ctrl->numDmrsCdmGrpsNoData = 1;
// Freq-demain allocation
while (rbStart < bwpSize && vrb_map[rbStart]) rbStart++;
uint8_t N_PRB_DMRS =
getN_PRB_DMRS(sched_ctrl->active_bwp, sched_ctrl->numDmrsCdmGrpsNoData);
int nrOfSymbols = getNrOfSymbols(sched_ctrl->active_bwp,
sched_ctrl->time_domain_allocation);
const uint32_t TBS =
nr_compute_tbs(nr_get_Qm_dl(sched_ctrl->mcs, sched_ctrl->mcsTableIdx),
nr_get_code_rate_dl(sched_ctrl->mcs, sched_ctrl->mcsTableIdx),
sched_ctrl->rbSize,
nrOfSymbols,
N_PRB_DMRS, // FIXME // This should be multiplied by the
// number of dmrs symbols
0 /* N_PRB_oh, 0 for initialBWP */,
0 /* tb_scaling */,
1 /* nrOfLayers */)
>> 3;
AssertFatal(TBS != 0, "TBS is zero but requested %d RBs!\n", sched_ctrl->rbSize);
int rbSize = 0;
uint32_t TBS = 0;
do {
rbSize++;
TBS = nr_compute_tbs(nr_get_Qm_dl(sched_ctrl->mcs, sched_ctrl->mcsTableIdx),
nr_get_code_rate_dl(sched_ctrl->mcs, sched_ctrl->mcsTableIdx),
rbSize,
nrOfSymbols,
N_PRB_DMRS, // FIXME // This should be multiplied by the
// number of dmrs symbols
0 /* N_PRB_oh, 0 for initialBWP */,
0 /* tb_scaling */,
1 /* nrOfLayers */)
>> 3;
} while (rbStart + rbSize < bwpSize && !vrb_map[rbStart + rbSize] && TBS < sched_ctrl->num_total_bytes);
sched_ctrl->rbSize = rbSize;
sched_ctrl->rbStart = rbStart;
}
/* mark the corresponding RBs as used */