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Commit 79965827 authored by Mario Hudon's avatar Mario Hudon
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- Added support for random RO selection for a given SSB index in a slot (as per 38.321) 

- Fixed random preamble selection in contention-based RA
- Cleaned-up comments and commented code
parent da355a39
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Showing with 116 additions and 264 deletions
openair2/LAYER2/NR_MAC_COMMON/nr_mac_common.c
View file @ 79965827
......@@ -1048,10 +1048,6 @@ static void build_ro_list(NR_ServingCellConfigCommon_t *scc, uint8_t unpaired) {
config_index = rach_ConfigGeneric->prach_ConfigurationIndex;
// WIP-IDCC Force config index to 44 for debug
// LOG_D(MAC,"Change PRACH config index from %d to 44 for debug\n", config_index);
// config_index = 44;
if (setup->msg1_SubcarrierSpacing)
mu = *setup->msg1_SubcarrierSpacing;
else
......@@ -1074,8 +1070,6 @@ static void build_ro_list(NR_ServingCellConfigCommon_t *scc, uint8_t unpaired) {
// Create the PRACH occasions map
// ==============================
// WIP-IDCC: For now assume no rejected PRACH occasions because of conflict with SSB or TDD_UL_DL_ConfigurationCommon schedule
// WIP-IDCC: Only FR2 is implemented
// WIP-IDCC: RACH preambles are not mapped yet (assumptions: ssb_per_rach is <= 1, totalNumberOfRA = CB-preamblesPerSSB - see NR_MAC_UE/nr_ra_procedures.c->nr_get_prach_resources)
// Identify the proper PRACH Configuration Index table according to the operating frequency
LOG_D(MAC,"Pointa %u, mu = %u, PRACH config index = %u, unpaired = %u\n", pointa, mu, config_index, unpaired);
......@@ -1334,7 +1328,7 @@ static void map_ssb_to_ro(NR_ServingCellConfigCommon_t *scc) {
// ==============================================================================================================
// WIP-IDCC: Assumption for now is that all the PRACH configuration periods within a maximum association pattern period have the same number of PRACH occasions
// (No PRACH occasions are conflicting with SSBs nor TDD_UL_DL_ConfigurationCommon schedule)
// There is only one possible association period
// There is only one possible association period which can contain up to 16 PRACH configuration periods
LOG_D(MAC,"Evaluate the number of PRACH configuration periods required to map all the SSBs and set the association period\n");
if (true == multiple_ssb_per_ro) {
required_nb_of_prach_occasion = ((ssb_list.nb_tx_ssb-1) + ssb_rach_ratio) / ssb_rach_ratio;
......@@ -1389,7 +1383,7 @@ static void map_ssb_to_ro(NR_ServingCellConfigCommon_t *scc) {
uint8_t ro_in_freq=0;
// Set the starting PRACH Configuration period index in the association_pattern map for this particular association period
prach_configuration_period_idx = 0; // WIP-IDCC: only one possible association period
prach_configuration_period_idx = 0; // WIP-IDCC: only one possible association period so the starting PRACH configuration period is automatically 0
// Check if we need to map multiple SSBs per RO or multiple ROs per SSB
if (true == multiple_ssb_per_ro) {
......@@ -1400,6 +1394,7 @@ static void map_ssb_to_ro(NR_ServingCellConfigCommon_t *scc) {
// --------------------
// WIP-IDCC: For the moment, only map each SSB idx once per association period if configuration is multiple SSBs per RO
// this is true if no PRACH occasions are conflicting with SSBs nor TDD_UL_DL_ConfigurationCommon schedule
ssb_idx = 0;
// Go through the list of PRACH config periods within this association period
......@@ -1417,6 +1412,7 @@ static void map_ssb_to_ro(NR_ServingCellConfigCommon_t *scc) {
// Go through the list of transmitted SSBs and map the required amount of SSBs to this RO
// WIP-IDCC: For the moment, only map each SSB idx once per association period if configuration is multiple SSBs per RO
// this is true if no PRACH occasions are conflicting with SSBs nor TDD_UL_DL_ConfigurationCommon schedule
for (; ssb_idx<MAX_NB_SSB; ssb_idx++) {
// Map only the transmitted ssb_idx
if (true == ssb_list.tx_ssb[ssb_idx].transmitted) {
......@@ -1596,154 +1592,50 @@ int get_nr_prach_info_from_ssb_index(uint8_t ssb_idx,
// If there is a matching RO slot in the SSB_to_RO map
if (NULL != prach_occasion_slot_p)
{
// Go through all the ROs in the slot and find the first that is mapped to the selected SSB index
// WIP-IDCC: A random RO mapped to the SSB index should be selected in the slot instead
// A random RO mapped to the SSB index should be selected in the slot
// First count the number of times the SSB index is found in that RO
uint8_t nb_mapped_ssb = 0;
for (int ro_in_time=0; ro_in_time < prach_occasion_slot_p->nb_of_prach_occasion_in_time; ro_in_time++) {
for (int ro_in_freq=0; ro_in_freq < prach_occasion_slot_p->nb_of_prach_occasion_in_freq; ro_in_freq++) {
prach_occasion_info_t *prach_occasion_info_p = &prach_occasion_slot_p->prach_occasion[ro_in_time][ro_in_freq];
for (uint8_t ssb_nb=0; ssb_nb<prach_occasion_info_p->nb_mapped_ssb; ssb_nb++) {
if (prach_occasion_info_p->mapped_ssb_idx[ssb_nb] == ssb_idx) {
*prach_occasion_info_pp = prach_occasion_info_p;
return 1;
}
nb_mapped_ssb++;
}
}
}
}
return 0;
}
// Choose a random SSB nb
uint8_t random_ssb_nb = 0;
int get_nr_prach_info_from_index(uint8_t index,
int frame,
int slot,
uint32_t pointa,
uint8_t mu,
uint8_t unpaired,
uint16_t *format,
uint8_t *start_symbol,
uint8_t *N_t_slot,
uint8_t *N_dur) {
int x,y;
int64_t s_map;
uint8_t format2 = 0xff;
random_ssb_nb = ((taus()) % nb_mapped_ssb);
if (pointa > 2016666) { //FR2
int y2;
uint8_t slot_60khz;
x = table_6_3_3_2_4_prachConfig_Index[index][2];
y = table_6_3_3_2_4_prachConfig_Index[index][3];
y2 = table_6_3_3_2_4_prachConfig_Index[index][4];
// checking n_sfn mod x = y
if ( (frame%x)==y || (frame%x)==y2 ) {
slot_60khz = slot >> (mu-2); // in table slots are numbered wrt 60kHz
s_map = table_6_3_3_2_4_prachConfig_Index[index][5];
if ( ((s_map>>slot_60khz)&0x01) ) {
if (mu == 3) {
if ( (table_6_3_3_2_4_prachConfig_Index[index][7] == 1) && (slot%2 == 0) )
return 0; // no prach in even slots @ 120kHz for 1 prach per 60khz slot
}
if (start_symbol != NULL && N_t_slot != NULL && N_dur != NULL && format != NULL){
*start_symbol = table_6_3_3_2_4_prachConfig_Index[index][6];
*N_t_slot = table_6_3_3_2_4_prachConfig_Index[index][8];
*N_dur = table_6_3_3_2_4_prachConfig_Index[index][9];
if (table_6_3_3_2_4_prachConfig_Index[index][1] != -1)
format2 = (uint8_t) table_6_3_3_2_4_prachConfig_Index[index][1];
*format = ((uint8_t) table_6_3_3_2_4_prachConfig_Index[index][0]) | (format2<<8);
LOG_D(MAC,"Frame %d slot %d: Getting PRACH info from index %d absoluteFrequencyPointA %u mu %u frame_type %u start_symbol %u N_t_slot %u N_dur %u \n", frame,
slot,
index,
pointa,
mu,
unpaired,
*start_symbol,
*N_t_slot,
*N_dur);
}
// Select the RO according to the chosen random SSB nb
nb_mapped_ssb=0;
for (int ro_in_time=0; ro_in_time < prach_occasion_slot_p->nb_of_prach_occasion_in_time; ro_in_time++) {
for (int ro_in_freq=0; ro_in_freq < prach_occasion_slot_p->nb_of_prach_occasion_in_freq; ro_in_freq++) {
prach_occasion_info_t *prach_occasion_info_p = &prach_occasion_slot_p->prach_occasion[ro_in_time][ro_in_freq];
for (uint8_t ssb_nb=0; ssb_nb<prach_occasion_info_p->nb_mapped_ssb; ssb_nb++) {
if (prach_occasion_info_p->mapped_ssb_idx[ssb_nb] == ssb_idx) {
if (nb_mapped_ssb == random_ssb_nb) {
*prach_occasion_info_pp = prach_occasion_info_p;
return 1;
}
else
return 0; // no prach in current slot
}
else
return 0; // no prach in current frame
}
else {
uint8_t subframe;
if (unpaired) {
x = table_6_3_3_2_3_prachConfig_Index[index][2];
y = table_6_3_3_2_3_prachConfig_Index[index][3];
if ( (frame%x)==y ) {
subframe = slot >> mu;
s_map = table_6_3_3_2_3_prachConfig_Index[index][4];
if ( (s_map>>subframe)&0x01 ) {
if (mu == 1) {
if ( (table_6_3_3_2_3_prachConfig_Index[index][6] <= 1) && (slot%2 == 0) )
return 0; // no prach in even slots @ 30kHz for 1 prach per subframe
}
if (start_symbol != NULL && N_t_slot != NULL && N_dur != NULL && format != NULL){
*start_symbol = table_6_3_3_2_3_prachConfig_Index[index][5];
*N_t_slot = table_6_3_3_2_3_prachConfig_Index[index][7];
*N_dur = table_6_3_3_2_3_prachConfig_Index[index][8];
if (table_6_3_3_2_3_prachConfig_Index[index][1] != -1)
format2 = (uint8_t) table_6_3_3_2_3_prachConfig_Index[index][1];
*format = ((uint8_t) table_6_3_3_2_3_prachConfig_Index[index][0]) | (format2<<8);
LOG_D(MAC,"Frame %d slot %d: Getting PRACH info from index %d (col 6 %ld) absoluteFrequencyPointA %u mu %u frame_type %u start_symbol %u N_t_slot %u N_dur %u \n", frame,
slot,
index, table_6_3_3_2_3_prachConfig_Index[index][6],
pointa,
mu,
unpaired,
*start_symbol,
*N_t_slot,
*N_dur);
nb_mapped_ssb++;
}
return 1;
}
else
return 0; // no prach in current slot
}
else
return 0; // no prach in current frame
}
else { // FDD
x = table_6_3_3_2_2_prachConfig_Index[index][2];
y = table_6_3_3_2_2_prachConfig_Index[index][3];
if ( (frame%x)==y ) {
subframe = slot >> mu;
s_map = table_6_3_3_2_2_prachConfig_Index[index][4];
if ( (s_map>>subframe)&0x01 ) {
if (mu == 1) {
if ( (table_6_3_3_2_2_prachConfig_Index[index][6] <= 1) && (slot%2 == 0) )
return 0; // no prach in even slots @ 30kHz for 1 prach per subframe
}
if (start_symbol != NULL && N_t_slot != NULL && N_dur != NULL && format != NULL){
*start_symbol = table_6_3_3_2_2_prachConfig_Index[index][5];
*N_t_slot = table_6_3_3_2_2_prachConfig_Index[index][7];
*N_dur = table_6_3_3_2_2_prachConfig_Index[index][8];
if (table_6_3_3_2_2_prachConfig_Index[index][1] != -1)
format2 = (uint8_t) table_6_3_3_2_2_prachConfig_Index[index][1];
*format = ((uint8_t) table_6_3_3_2_2_prachConfig_Index[index][0]) | (format2<<8);
LOG_D(MAC,"Frame %d slot %d: Getting PRACH info from index %d absoluteFrequencyPointA %u mu %u frame_type %u start_symbol %u N_t_slot %u N_dur %u \n", frame,
slot,
index,
pointa,
mu,
unpaired,
*start_symbol,
*N_t_slot,
*N_dur);
}
return 1;
}
else
return 0; // no prach in current slot
}
else
return 0; // no prach in current frame
}
}
return 0;
}
//Table 6.3.3.1-3: Mapping from logical index i to sequence number u for preamble formats with L_RA = 839
......
openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c
View file @ 79965827
......@@ -144,27 +144,27 @@ void nr_get_prach_resources(module_id_t mod_id,
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_oneEighth:
multiple_ssb_per_ro = false;
ssb_rach_ratio = 8;
cb_preambles_per_ssb = nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneEighth;
cb_preambles_per_ssb = 4 * (nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneEighth + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_oneFourth:
multiple_ssb_per_ro = false;
ssb_rach_ratio = 4;
cb_preambles_per_ssb = nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneFourth;
cb_preambles_per_ssb = 4 * (nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneFourth + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_oneHalf:
multiple_ssb_per_ro = false;
ssb_rach_ratio = 2;
cb_preambles_per_ssb = nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneHalf;
cb_preambles_per_ssb = 4 * (nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.oneHalf + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_one:
multiple_ssb_per_ro = true;
ssb_rach_ratio = 1;
cb_preambles_per_ssb = nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.one;
cb_preambles_per_ssb = 4 * (nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.one + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_two:
multiple_ssb_per_ro = true;
ssb_rach_ratio = 2;
cb_preambles_per_ssb = nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.two;
cb_preambles_per_ssb = 4 * (nr_rach_ConfigCommon->ssb_perRACH_OccasionAndCB_PreamblesPerSSB->choice.two + 1);
break;
case NR_RACH_ConfigCommon__ssb_perRACH_OccasionAndCB_PreamblesPerSSB_PR_four:
multiple_ssb_per_ro = true;
......@@ -313,6 +313,7 @@ void nr_get_prach_resources(module_id_t mod_id,
prach_resources->ra_PreambleIndex = starting_preamble_nb + sizeOfRA_PreamblesGroupA + ((taus()) % (cb_preambles_per_ssb - sizeOfRA_PreamblesGroupA));
}
}
LOG_D(MAC, "[RAPROC] - Selected RA preamble index %d for contention-based random access procedure... \n", prach_resources->ra_PreambleIndex);
}
......
openair2/LAYER2/NR_MAC_UE/nr_ue_procedures.c
View file @ 79965827
......@@ -940,9 +940,7 @@ NR_UE_L2_STATE_t nr_ue_scheduler(nr_downlink_indication_t *dl_info, nr_uplink_in
// - Partial configuration is actually already stored in (fapi_nr_prach_config_t) &mac->phy_config.config_req->prach_config
void nr_ue_prach_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t slotP) {
// uint8_t config_index, mu, N_dur, N_t_slot, start_symbol;
uint16_t format, format0, format1, ncs;
// int msg1_FDM, is_nr_prach_slot, fdm;
int is_nr_prach_slot;
prach_occasion_info_t *prach_occasion_info_p;
......@@ -955,32 +953,15 @@ void nr_ue_prach_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t s
NR_ServingCellConfigCommon_t *scc = mac->scc;
NR_RACH_ConfigCommon_t *setup = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup;
// NR_FrequencyInfoDL_t *frequencyInfoDL = scc->downlinkConfigCommon->frequencyInfoDL;
NR_RACH_ConfigGeneric_t *rach_ConfigGeneric = &setup->rach_ConfigGeneric;
// config_index = rach_ConfigGeneric->prach_ConfigurationIndex;
mac->RA_offset = 2; // to compensate the rx frame offset at the gNB
mac->generate_nr_prach = 0; // Reset flag for PRACH generation
if (is_nr_UL_slot(scc, slotP)) {
// if (setup->msg1_SubcarrierSpacing)
// mu = *setup->msg1_SubcarrierSpacing;
// else
// mu = frequencyInfoDL->scs_SpecificCarrierList.list.array[0]->subcarrierSpacing;
// is_nr_prach_slot = get_nr_prach_info_from_index(config_index,
// (int)frameP,
// (int)slotP,
// frequencyInfoDL->absoluteFrequencyPointA,
// mu,
// cfg->cell_config.frame_duplex_type,
// &format,
// &start_symbol,
// &N_t_slot,
// &N_dur);
// WIP-IDCC Need to get the proper selected ssb_idx
// Initial beam selection functionality is not available yet
uint8_t selected_gnb_ssb_idx = 0;
// Get any valid PRACH occasion in the current slot for the selected SSB index
......@@ -990,24 +971,10 @@ void nr_ue_prach_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t s
&prach_occasion_info_p);
if (is_nr_prach_slot && mac->ra_state == RA_UE_IDLE) {
AssertFatal(NULL != prach_occasion_info_p,"PRACH Occasion Info not returned in a valid NR Prach Slot\n");
mac->generate_nr_prach = 1;
// fdm = rach_ConfigGeneric->msg1_FDM;
//
// switch (fdm){
// case 0:
// case 1:
// case 2:
// case 3:
// msg1_FDM = 1 << fdm;
// break;
// default:
// AssertFatal(1 == 0, "Unknown msg1_FDM from rach_ConfigGeneric %d\n", fdm);
// }
format = prach_occasion_info_p->format;
format0 = format & 0xff; // single PRACH format
format1 = (format >> 8) & 0xff; // dual PRACH format
......@@ -1015,8 +982,6 @@ void nr_ue_prach_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t s
ul_config->sfn = frameP;
ul_config->slot = slotP;
// for (int n = 0; n < msg1_FDM; n++) { // one structure per frequency domain occasion
ul_config->ul_config_list[ul_config->number_pdus].pdu_type = FAPI_NR_UL_CONFIG_TYPE_PRACH;
prach_config_pdu = &ul_config->ul_config_list[ul_config->number_pdus].prach_config_pdu;
memset(prach_config_pdu, 0, sizeof(fapi_nr_ul_config_prach_pdu));
......@@ -1024,12 +989,6 @@ void nr_ue_prach_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t s
ncs = get_NCS(rach_ConfigGeneric->zeroCorrelationZoneConfig, format0, setup->restrictedSetConfig);
// filling PRACH PDU for FAPI config request
// prach_config_pdu->phys_cell_id = *scc->physCellId;
// prach_config_pdu->num_prach_ocas = N_t_slot;
// prach_config_pdu->prach_start_symbol = start_symbol;
// prach_config_pdu->num_ra = n;
prach_config_pdu->phys_cell_id = *scc->physCellId;
prach_config_pdu->num_prach_ocas = 1;
prach_config_pdu->prach_slot = prach_occasion_info_p->slot;
......@@ -1037,13 +996,13 @@ void nr_ue_prach_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t s
prach_config_pdu->num_ra = prach_occasion_info_p->fdm;
prach_config_pdu->num_cs = ncs;
// prach_config_pdu->root_seq_id = prach_config->num_prach_fd_occasions_list[n].prach_root_sequence_index;
prach_config_pdu->root_seq_id = prach_config->num_prach_fd_occasions_list[prach_occasion_info_p->fdm].prach_root_sequence_index;
prach_config_pdu->restricted_set = prach_config->restricted_set_config;
// prach_config_pdu->freq_msg1 = prach_config->num_prach_fd_occasions_list[n].k1;
prach_config_pdu->freq_msg1 = prach_config->num_prach_fd_occasions_list[prach_occasion_info_p->fdm].k1;
LOG_D(MAC,"Selected RO Frame %u, Slot %u, Symbol %u, Fdm %u\n", frameP, prach_config_pdu->prach_slot, prach_config_pdu->prach_start_symbol, prach_config_pdu->num_ra);
// Search which SSB is mapped in the RO (among all the SSBs mapped to this RO)
for (prach_config_pdu->ssb_nb_in_ro=0; prach_config_pdu->ssb_nb_in_ro<prach_occasion_info_p->nb_mapped_ssb; prach_config_pdu->ssb_nb_in_ro++) {
if (prach_occasion_info_p->mapped_ssb_idx[prach_config_pdu->ssb_nb_in_ro] == selected_gnb_ssb_idx)
......@@ -1110,7 +1069,7 @@ void nr_ue_prach_scheduler(module_id_t module_idP, frame_t frameP, sub_frame_t s
AssertFatal(1 == 0, "Invalid PRACH format");
}
} // if format1
// } for n
} else if (mac->ra_state == RA_SUCCEEDED){
mac->generate_nr_prach = 2;
} // if-else is_nr_prach_slot
......
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