mirror of https://github.com/PentHertz/srsLTE.git
update comment, explaining the reasoning behind setting a lower bound for allocated UL grants
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@ -298,7 +298,7 @@ int get_required_prb_dl(const sched_ue_cell& cell,
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uint32_t get_required_prb_ul(const sched_ue_cell& cell, uint32_t req_bytes)
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uint32_t get_required_prb_ul(const sched_ue_cell& cell, uint32_t req_bytes)
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{
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{
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const static int MIN_ALLOC_BYTES = 10; /// There should be enough space for RLC header + BSR + some payload
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const static int MIN_ALLOC_BYTES = 10;
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if (req_bytes == 0) {
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if (req_bytes == 0) {
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return 0;
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return 0;
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}
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}
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@ -317,7 +317,9 @@ uint32_t get_required_prb_ul(const sched_ue_cell& cell, uint32_t req_bytes)
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uint32_t final_tbs = std::get<3>(ret);
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uint32_t final_tbs = std::get<3>(ret);
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while (final_tbs < MIN_ALLOC_BYTES and req_prbs < cell.cell_cfg->nof_prb()) {
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while (final_tbs < MIN_ALLOC_BYTES and req_prbs < cell.cell_cfg->nof_prb()) {
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// Note: If PHR<0 is limiting the max nof PRBs per UL grant, the UL grant may become too small to fit any
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// Note: If PHR<0 is limiting the max nof PRBs per UL grant, the UL grant may become too small to fit any
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// data other than headers + BSR. In this edge-case, force an increase the nof required PRBs.
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// data other than headers + BSR. Besides, forcing unnecessary segmentation, it may additionally
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// forbid the UE from fitting small RRC messages (e.g. RRCReconfComplete) in the UL grants.
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// To avoid TBS<10, we force an increase the nof required PRBs.
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req_prbs++;
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req_prbs++;
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final_tbs = compute_tbs_approx(req_prbs);
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final_tbs = compute_tbs_approx(req_prbs);
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}
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}
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