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update comment, explaining the reasoning behind setting a lower bound for allocated UL grants

This commit is contained in:
Francisco 2021-05-03 15:48:03 +01:00 committed by Francisco Paisana
parent f7016633d2
commit a43dd68d57
1 changed files with 4 additions and 2 deletions
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6
srsenb/src/stack/mac/sched_ue_ctrl/sched_ue_cell.cc
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@ -298,7 +298,7 @@ int get_required_prb_dl(const sched_ue_cell& cell,
uint32_t get_required_prb_ul(const sched_ue_cell& cell, uint32_t req_bytes)
{
const static int MIN_ALLOC_BYTES = 10; /// There should be enough space for RLC header + BSR + some payload
const static int MIN_ALLOC_BYTES = 10;
if (req_bytes == 0) {
return 0;
}
@ -317,7 +317,9 @@ uint32_t get_required_prb_ul(const sched_ue_cell& cell, uint32_t req_bytes)
uint32_t final_tbs = std::get<3>(ret);
while (final_tbs < MIN_ALLOC_BYTES and req_prbs < cell.cell_cfg->nof_prb()) {
// Note: If PHR<0 is limiting the max nof PRBs per UL grant, the UL grant may become too small to fit any
// data other than headers + BSR. In this edge-case, force an increase the nof required PRBs.
// data other than headers + BSR. Besides, forcing unnecessary segmentation, it may additionally
// forbid the UE from fitting small RRC messages (e.g. RRCReconfComplete) in the UL grants.
// To avoid TBS<10, we force an increase the nof required PRBs.
req_prbs++;
final_tbs = compute_tbs_approx(req_prbs);
}