mirror of https://github.com/PentHertz/srsLTE.git
sched: revert lifting of restriction of maximum UL coderate of 0.930
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@ -94,9 +94,7 @@ tbs_info compute_mcs_and_tbs(uint32_t nof_prb,
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assert((is_ul or not ulqam64_enabled) && "DL cannot use UL-QAM64 enable flag");
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uint32_t max_Qm = (is_ul) ? (ulqam64_enabled ? 6 : 4) : (use_tbs_index_alt ? 8 : 6);
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if (!is_ul) {
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max_coderate = std::min(max_coderate, 0.930F * max_Qm);
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}
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max_coderate = std::min(max_coderate, 0.930F * max_Qm);
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int mcs = 0;
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do {
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@ -125,9 +123,7 @@ tbs_info compute_mcs_and_tbs(uint32_t nof_prb,
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// update max coderate based on mcs
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srsran_mod_t mod = (is_ul) ? srsran_ra_ul_mod_from_mcs(mcs) : srsran_ra_dl_mod_from_mcs(mcs, use_tbs_index_alt);
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uint32_t Qm = srsran_mod_bits_x_symbol(mod);
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if (!is_ul) {
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max_coderate = std::min(0.930F * Qm, max_coderate);
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}
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max_coderate = std::min(0.930F * Qm, max_coderate);
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if (coderate <= max_coderate) {
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// solution was found
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@ -155,7 +151,7 @@ tbs_info compute_min_mcs_and_tbs_from_required_bytes(uint32_t nof_prb,
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{
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// get max MCS/TBS that meets max coderate requirements
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tbs_info tb_max = compute_mcs_and_tbs(nof_prb, nof_re, cqi, max_mcs, is_ul, ulqam64_enabled, use_tbs_index_alt);
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if (tb_max.tbs_bytes + 8 <= (int)req_bytes or tb_max.mcs == 0 or req_bytes <= 0) {
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if (tb_max.tbs_bytes + 8 <= (int)req_bytes or tb_max.mcs == 0) {
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// if mcs cannot be lowered or a decrease in TBS index won't meet req_bytes requirement
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return tb_max;
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}
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@ -302,10 +302,10 @@ void test_ul_mcs_tbs_derivation()
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TESTASSERT(compute_tbs_mcs(50, 50 - 5).mcs == 9);
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cqi = 15;
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TESTASSERT(compute_tbs_mcs(25, 25 - 4).mcs == 28);
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TESTASSERT(compute_tbs_mcs(50, 50 - 5).mcs == 28);
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TESTASSERT(compute_tbs_mcs(75, 75 - 5).mcs == 28);
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TESTASSERT(compute_tbs_mcs(100, 100 - 5).mcs == 28);
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TESTASSERT(compute_tbs_mcs(25, 25 - 4).mcs == 23);
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TESTASSERT(compute_tbs_mcs(50, 50 - 5).mcs == 23);
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TESTASSERT(compute_tbs_mcs(75, 75 - 5).mcs == 24);
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TESTASSERT(compute_tbs_mcs(100, 100 - 5).mcs == 23);
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}
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} // namespace srsenb
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