maki/openairinterface5g
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Check if Msg3 start&length can be accommodated in mixed slot

Browse Source 
Prior to this commit, it might happen that the gNB used TDA 0 (Start 0
len 13) for mixed slot, in which case the UE could not send msg3
(because a mixed slot has less than 13 symbols).
This commit is contained in:
Robert Schmidt
2024-04-08 17:30:37 +02:00
parent e6e25275ed
commit e3747ab592
1 changed files with 14 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c
+14 -2
View File
@@ -760,6 +760,7 @@ static int get_feasible_msg3_tda(frame_type_t frame_type,
// TDD
DevAssert(tdd != NULL);
uint8_t tdd_period_slot = slots_per_frame / get_nb_periods_per_frame(tdd->dl_UL_TransmissionPeriodicity);
for (int i = 0; i < tda_list->list.count; i++) {
// check if it is UL
long k2 = *tda_list->list.array[i]->k2;
@@ -769,8 +770,19 @@ static int get_feasible_msg3_tda(frame_type_t frame_type,
// check if enough symbols in case of mixed slot
bool has_mixed = tdd->nrofUplinkSymbols != 0 || tdd->nrofDownlinkSymbols != 0;
// is in mixed slot with less than 3 symbols?
if (has_mixed && temp_slot == tdd->nrofDownlinkSlots && tdd->nrofUplinkSymbols < 3)
bool is_mixed = has_mixed && ((temp_slot % tdd_period_slot) == tdd->nrofDownlinkSlots);
// if the mixed slot has not enough symbols, skip
if (is_mixed && tdd->nrofUplinkSymbols < 3)
continue;
uint16_t slot_mask = is_mixed ? SL_to_bitmap(14 - tdd->nrofUplinkSymbols, tdd->nrofUplinkSymbols) : 0x3fff;
long startSymbolAndLength = tda_list->list.array[i]->startSymbolAndLength;
int start, nr;
SLIV2SL(startSymbolAndLength, &start, &nr);
uint16_t msg3_mask = SL_to_bitmap(start, nr);
LOG_D(NR_MAC, "Check Msg3 TDA %d for slot %d: k2 %ld, S %d L %d\n", i, temp_slot, k2, start, nr);
/* if this start and length of this TDA cannot be fulfilled, skip */
if ((slot_mask & msg3_mask) != msg3_mask)
continue;
// is in mixed slot with more or equal than 3 symbols, or UL slot