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Add get_ul_slot_offset function to calculate nth UL slot offset for UE in TDD period

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* the get_ul_slot_offset function calculates the offset of the nth uplink (UL) slot for a given UE index within a TDD period
* this function uses the frame structure bitmap to determine the UL slot positions
This commit is contained in:
Guido Casati
2025-01-28 10:07:31 +01:00
committed by Guido Casati
parent ae1a5a968b
commit bebbc857a0
2 changed files with 36 additions and 0 deletions
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openair2/LAYER2/NR_MAC_gNB/config.c
+35
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@@ -442,6 +442,41 @@ int get_ul_slots_per_frame(const frame_structure_t *fs)
return fs->is_tdd ? fs->numb_period_frame * get_ul_slots_per_period(fs) : fs->numb_slots_frame;
}
/**
* @brief Get the nth UL slot offset for UE index idx in a TDD period using the frame structure bitmap
* @param fs frame structure
* @param idx UE index
* @param count_mixed indicates whether counting mixed slot with UL symbols (e.g. for SRS) or only full UL slots
* @return slot index offset
*/
int get_ul_slot_offset(const frame_structure_t *fs, int idx, bool count_mixed)
{
DevAssert(fs);
// FDD
if (!fs->is_tdd)
return idx;
// UL slots indexes in period
int ul_slot_idxs[fs->numb_slots_period];
int ul_slot_count = 0;
/* Populate the indices of UL slots in the TDD period from the bitmap
count also mixed slots with UL symbols if flag count_mixed is present */
for (int i = 0; i < fs->numb_slots_period; i++) {
bool is_mixed = (fs->period_cfg.tdd_slot_bitmap[i].num_ul_symbols > 1) && (fs->period_cfg.tdd_slot_bitmap[i].slot_type == TDD_NR_MIXED_SLOT);
if ((count_mixed && is_mixed) || fs->period_cfg.tdd_slot_bitmap[i].slot_type == TDD_NR_UPLINK_SLOT) {
ul_slot_idxs[ul_slot_count++] = i;
}
}
// Compute slot index offset
int period_idx = idx / ul_slot_count; // wrap up the count of complete TDD periods spanned by the index
int ul_slot_idx_in_period = idx % ul_slot_count; // wrap up the UL slot index within the current TDD period
return ul_slot_idxs[ul_slot_idx_in_period] + period_idx * fs->numb_slots_period;
}
/**
* @brief Configures the frame structure and the NFAPI config request
* depending on the duplex mode. If TDD, does the TDD patterns
openair2/LAYER2/NR_MAC_gNB/mac_proto.h
+1
View File
@@ -44,6 +44,7 @@ int get_ul_slots_per_frame(const frame_structure_t *fs);
int get_dl_slots_per_period(const frame_structure_t *fs);
int get_full_ul_slots_per_period(const frame_structure_t *fs);
int get_full_dl_slots_per_period(const frame_structure_t *fs);
int get_ul_slot_offset(const frame_structure_t *fs, int idx, bool count_mixed);
void mac_top_init_gNB(ngran_node_t node_type,
NR_ServingCellConfigCommon_t *scc,