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srsRAN_4G
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increase tbs until allocation is big enough to fit MAC subheader and RLC header

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master
Francisco Paisana 5 years ago
parent 1f3aee2fc0
commit 9f266161cf
2 changed files with 14 additions and 9 deletions
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2
srsenb/src/stack/mac/scheduler_grid.cc
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@ -826,7 +826,7 @@ void sf_sched::set_dl_data_sched_result(const pdcch_grid_t::alloc_result_t& dci_
}
if (tbs <= 0) {
log_h->warning("SCHED: sched_cell_params[CARRIER_IDX].cfg %s rnti=0x%x, pid=%d, mask=%s, tbs=%d, buffer=%d\n",
log_h->warning("SCHED: DL %s failed rnti=0x%x, pid=%d, mask=%s, tbs=%d, buffer=%d\n",
is_newtx ? "tx" : "retx",
user->get_rnti(),
h->get_id(),

21
srsenb/src/stack/mac/scheduler_ue.cc
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@ -345,6 +345,8 @@ void sched_ue::tpc_dec()
*
*******************************************************/
constexpr uint32_t min_mac_sdu_size = 5; // accounts for MAC SDU subheader and RLC header
/**
* Allocate space for multiple MAC SDUs (i.e. RLC PDUs) and corresponding MAC SDU subheaders
* @param data struct where the rlc pdu allocations are stored
@ -355,9 +357,8 @@ void sched_ue::tpc_dec()
uint32_t sched_ue::allocate_mac_sdus(sched_interface::dl_sched_data_t* data, uint32_t total_tbs, uint32_t tbidx)
{
// TS 36.321 sec 7.1.2 - MAC PDU subheader is 2 bytes if L<=128 and 3 otherwise
auto compute_subheader_size = [](uint32_t sdu_size) { return sdu_size > 128 ? 3 : 2; };
constexpr uint32_t min_mac_sdu_size = 5; // accounts for MAC SDU subheader and RLC header
uint32_t rem_tbs = total_tbs;
auto compute_subheader_size = [](uint32_t sdu_size) { return sdu_size > 128 ? 3 : 2; };
uint32_t rem_tbs = total_tbs;
// if we do not have enough bytes to fit MAC subheader and RLC header, skip MAC SDU allocation
while (rem_tbs >= min_mac_sdu_size) {
@ -542,6 +543,10 @@ int sched_ue::generate_format2a_unlocked(dl_harq_proc* h,
} else if (tb_en[tb] && req_bytes && no_retx) {
if (carriers[cc_idx].fixed_mcs_dl < 0) {
tbs = carriers[cc_idx].alloc_tbs_dl(nof_prb, nof_re, req_bytes, &mcs);
while (tbs > 0 and (uint32_t) tbs < min_mac_sdu_size and mcs < 28) {
mcs++;
tbs = srslte_ra_tbs_from_idx((uint32_t)srslte_ra_tbs_idx_from_mcs(mcs, false), nof_prb) / 8;
}
} else {
tbs = srslte_ra_tbs_from_idx(
(uint32_t)srslte_ra_tbs_idx_from_mcs((uint32_t)carriers[cc_idx].fixed_mcs_dl, false), nof_prb) /
@ -549,11 +554,11 @@ int sched_ue::generate_format2a_unlocked(dl_harq_proc* h,
mcs = carriers[cc_idx].fixed_mcs_dl;
}
h->new_tx(user_mask, tb, tti, mcs, tbs, data->dci.location.ncce);
allocate_mac_sdus(data, tbs, tb);
Debug("SCHED: Alloc format2/2a new mcs=%d, tbs=%d, nof_prb=%d, req_bytes=%d\n", mcs, tbs, nof_prb, req_bytes);
tbs = allocate_mac_sdus(data, tbs, tb);
if (tbs > 0) {
h->new_tx(user_mask, tb, tti, mcs, tbs, data->dci.location.ncce);
Debug("SCHED: Alloc format2/2a new mcs=%d, tbs=%d, nof_prb=%d, req_bytes=%d\n", mcs, tbs, nof_prb, req_bytes);
}
}
/* Fill DCI TB dedicated fields */

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