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Remove dedicated Msg3 TDA

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A dedicated Msg3 TDA is simply not necessary: get_feasible_msg3_tda()
already iterates through all TDAs to find a suitable one for Msg3, and
takes things such as parameter Δ already into account.

The only prerequisite is that the ra_ResponseWindow is long enough. In
some configurations, Msg3 TDA ensured that Msg2 still happened during
ra_ResponseWindow, while Msg3 was outside of it. This is not necessarily
the case anymore, unless ra_ResponseWindow is long enough.

For the normal user, removing ra_ResponseWindow from the config will be
enough.
This commit is contained in:
Robert Schmidt
2025-07-08 11:54:38 +02:00
parent 41d14b571c
commit 961a646dc7
1 changed files with 0 additions and 16 deletions
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16
openair2/LAYER2/NR_MAC_gNB/nr_radio_config.c
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@@ -1066,8 +1066,6 @@ void nr_rrc_config_ul_tda(NR_ServingCellConfigCommon_t *scc, int min_fb_delay)
const int k2 = min_fb_delay;
int mu = scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.subcarrierSpacing;
// UL TDA index 0 is basic slot configuration starting in symbol 0 til the last but one symbol
NR_PUSCH_TimeDomainResourceAllocation_t *tda;
tda = set_TimeDomainResourceAllocation(k2, get_SLIV(0, 13));
@@ -1097,20 +1095,6 @@ void nr_rrc_config_ul_tda(NR_ServingCellConfigCommon_t *scc, int min_fb_delay)
tda = set_TimeDomainResourceAllocation(k2, sliv);
asn1cSeqAdd(&tda_list->list, tda);
}
// UL TDA index 3 for msg3 in the mixed slot (TDD)
int tdd_period_idx = get_tdd_period_idx(scc->tdd_UL_DL_ConfigurationCommon);
int nb_periods_per_frame = get_nb_periods_per_frame(tdd_period_idx);
int nb_slots_per_period = ((1 << mu) * 10) / nb_periods_per_frame;
int k2_msg3 = nb_slots_per_period - get_delta_for_k2(mu);
bool no_mix_slot = ul_symb < 3; // we need at least 2 symbols for scheduling Msg3
long sliv = no_mix_slot ? get_SLIV(0, 13) : get_SLIV(NR_NUMBER_OF_SYMBOLS_PER_SLOT - ul_symb, ul_symb - 1);
struct NR_PUSCH_TimeDomainResourceAllocation *puschTdrAllocMsg3 = set_TimeDomainResourceAllocation(k2_msg3, sliv);
if (*puschTdrAllocMsg3->k2 < min_fb_delay)
*puschTdrAllocMsg3->k2 += nb_slots_per_period;
AssertFatal(*puschTdrAllocMsg3->k2 < 33,
"Computed k2 for msg3 %ld is larger than the range allowed by RRC (0..32)\n",
*puschTdrAllocMsg3->k2);
asn1cSeqAdd(&tda_list->list, puschTdrAllocMsg3);
}
}