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bugfix,tpc: place a cap on TPC due to PHR only when TPC is positive

This commit is contained in:
Francisco 2021-06-04 14:16:49 +01:00 committed by Francisco Paisana
parent 7badfb1c88
commit bdc4362475
1 changed files with 9 additions and 8 deletions
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17
srsenb/hdr/stack/mac/sched_ue_ctrl/tpc.h
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@ -165,14 +165,7 @@ private:
assert(ch_snr.pending_delta == 0); // ensure called once per {cc,tti}
float target_snr_dB = cc == PUSCH_CODE ? target_pusch_snr_dB : target_pucch_snr_dB;
if (last_phr < 0 and not ch_snr.phr_flag) {
// negative PHR
logger.info(
"TPC: rnti=0x%x, %s command=-1 due to PHR=%d < 0", rnti, cc == PUSCH_CODE ? "PUSCH" : "PUCCH", last_phr);
ch_snr.phr_flag = true;
return encode_tpc_delta(-1);
}
if (target_snr_dB < 0 or last_phr <= 0) {
if (target_snr_dB < 0) {
// undefined target sinr case, or no more PHR
return encode_tpc_delta(0);
}
@ -180,11 +173,19 @@ private:
// more time required before sending next TPC
return encode_tpc_delta(0);
}
if (last_phr < 0 and not ch_snr.phr_flag) {
// negative PHR
logger.info(
"TPC: rnti=0x%x, %s command=-1 due to PHR=%d < 0", rnti, cc == PUSCH_CODE ? "PUSCH" : "PUCCH", last_phr);
ch_snr.phr_flag = true;
return encode_tpc_delta(-1);
}
// target SINR is finite and there is power headroom
float diff = target_snr_dB - ch_snr.snr_avg.value();
diff -= ch_snr.win_tpc_values.value() + ch_snr.acc_tpc_values;
if (diff >= 1) {
diff = std::min(diff, (float)std::max(last_phr, 0)); // low PHR places a cap on TPC
ch_snr.pending_delta = diff > 3 ? 3 : 1;
ch_snr.last_tpc_tti_count = tti_count;
} else if (diff <= -1) {