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Commit a30c8075 authored by cig's avatar cig
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Cleanup RA procedure @ UE 

- review/cleanup of commented out descriptions
- logging
- indentation
- spacing
- typos
- cleanup of unused RA_tx_frame, RA_tx_slot members
parent 9aa7b5b4
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Showing with 39 additions and 90 deletions
openair2/LAYER2/NR_MAC_UE/mac_defs.h
View file @ a30c8075
......@@ -216,10 +216,6 @@ typedef struct {
NR_BeamFailureRecoveryConfig_t RA_BeamFailureRecoveryConfig;
/// Random-access backoff counter
int16_t RA_backoff_indicator;
/// Random-access variable for window calculation (frame of last change in window counter)
uint32_t RA_tx_frame;
/// Random-access variable for window calculation (subframe of last change in window counter)
uint8_t RA_tx_subframe;
/// Scheduled TX frame for RA Msg3
frame_t msg3_frame;
/// Scheduled TX slot for RA Msg3
......
openair2/LAYER2/NR_MAC_UE/nr_ra_procedures.c
View file @ a30c8075
......@@ -390,6 +390,24 @@ uint16_t set_ra_rnti(NR_UE_MAC_INST_t *mac, fapi_nr_ul_config_prach_pdu *prach_p
// This routine implements Section 5.1.2 (UE Random Access Resource Selection)
// and Section 5.1.3 (Random Access Preamble Transmission) from 3GPP TS 38.321
// - currently the PRACH preamble is set through RRC configuration for 4-step CFRA mode
// todo:
// - determine next available PRACH occasion
// -- if RA initiated for SI request and ra_AssociationPeriodIndex and si-RequestPeriod are configured
// -- else if SSB is selected above
// -- else if CSI-RS is selected above
// - switch initialisation cases
// -- RA initiated by beam failure recovery operation (subclause 5.17 TS 38.321)
// --- SSB selection, set prach_resources->ra_PreambleIndex
// -- RA initiated by PDCCH: ra_preamble_index provided by PDCCH && ra_PreambleIndex != 0b000000
// --- set PREAMBLE_INDEX to ra_preamble_index
// --- select the SSB signalled by PDCCH
// -- RA initiated for SI request:
// --- SSB selection, set prach_resources->ra_PreambleIndex
// - condition on notification of suspending power ramping counter from lower layer (5.1.3 TS 38.321)
// - check if SSB or CSI-RS have not changed since the selection in the last RA Preamble tranmission
// - Contention-based RA preamble selection:
// -- selection of SSB with SS-RSRP above rsrp-ThresholdSSB else select any SSB
void nr_get_prach_resources(module_id_t mod_id,
int CC_id,
uint8_t gNB_id,
......@@ -402,66 +420,22 @@ void nr_get_prach_resources(module_id_t mod_id,
LOG_D(PHY, "In %s: getting PRACH resources frame (first_Msg3 %d)\n", __FUNCTION__, first_Msg3);
///////////////////////////////////////////////////////////
//////////* UE Random Access Resource Selection *//////////
///////////////////////////////////////////////////////////
// todo:
// - switch initialisation cases
// -- RA initiated by beam failure recovery operation (subclause 5.17 TS 38.321)
// --- SSB selection, set prach_resources->ra_PreambleIndex
// -- RA initiated by PDCCH: ra_preamble_index provided by PDCCH && ra_PreambleIndex != 0b000000
// --- set PREAMBLE_INDEX to ra_preamble_index
// --- select the SSB signalled by PDCCH
// -- RA initiated for SI request:
// --- SSB selection, set prach_resources->ra_PreambleIndex
if (rach_ConfigDedicated) {
//////////* Contention free RA *//////////
// - the PRACH preamble for the UE to transmit is set through RRC configuration
// - this is the default mode in current implementation!
// Operation for contention-free RA resources when:
// - available SSB with SS-RSRP above rsrp-ThresholdSSB: SSB selection
// - available CSI-RS with CSI-RSRP above rsrp-ThresholdCSI-RS: CSI-RS selection
// - network controlled Mobility
if (rach_ConfigDedicated->cfra){
uint8_t cfra_ssb_resource_idx = 0;
prach_resources->ra_PreambleIndex = rach_ConfigDedicated->cfra->resources.choice.ssb->ssb_ResourceList.list.array[cfra_ssb_resource_idx]->ra_PreambleIndex;
LOG_D(MAC, "In %s: selected RA preamble index %d for contention-free random access procedure\n", __FUNCTION__, prach_resources->ra_PreambleIndex);
LOG_D(MAC, "In %s: selected RA preamble index %d for contention-free random access procedure for SSB with Id %d\n", __FUNCTION__, prach_resources->ra_PreambleIndex, cfra_ssb_resource_idx);
}
} else {
//////////* Contention-based RA preamble selection *//////////
// todo:
// - selection of SSB with SS-RSRP above rsrp-ThresholdSSB else select any SSB
// - determine next available PRACH occasion
// rsrp_ThresholdSSB = *nr_rach_ConfigCommon->rsrp_ThresholdSSB;
int16_t dl_pathloss = get_nr_PL(mod_id, CC_id, gNB_id);
ssb_rach_config(prach_resources, nr_rach_ConfigCommon, prach_pdu);
ra_preambles_config(prach_resources, mac, dl_pathloss);
LOG_D(MAC, "[RAPROC] - Selected RA preamble index %d for contention-based random access procedure... \n", prach_resources->ra_PreambleIndex);
}
// todo determine next available PRACH occasion
// - if RA initiated for SI request and ra_AssociationPeriodIndex and si-RequestPeriod are configured
// - else if SSB is selected above
// - else if CSI-RS is selected above
/////////////////////////////////////////////////////////////////////////////
//////////* Random Access Preamble Transmission (5.1.3 TS 38.321) *//////////
/////////////////////////////////////////////////////////////////////////////
// todo:
// - condition on notification of suspending power ramping counter from lower layer (5.1.3 TS 38.321)
// - check if SSB or CSI-RS have not changed since the selection in the last RA Preamble tranmission
if (prach_resources->RA_PREAMBLE_TRANSMISSION_COUNTER > 1)
prach_resources->RA_PREAMBLE_POWER_RAMPING_COUNTER++;
prach_resources->ra_PREAMBLE_RECEIVED_TARGET_POWER = nr_get_Po_NOMINAL_PUSCH(prach_resources, mod_id, CC_id);
prach_resources->ra_RNTI = set_ra_rnti(mac, prach_pdu);
}
......@@ -470,7 +444,6 @@ void nr_get_prach_resources(module_id_t mod_id,
void nr_Msg1_transmitted(module_id_t mod_id, uint8_t CC_id, frame_t frameP, uint8_t gNB_id){
NR_UE_MAC_INST_t *mac = get_mac_inst(mod_id);
mac->ra_state = WAIT_RAR;
// Start contention resolution timer
mac->RA_attempt_number++;
}
......@@ -483,25 +456,21 @@ void nr_Msg3_transmitted(module_id_t mod_id, uint8_t CC_id, frame_t frameP, uint
}
/////////////////////////////////////////////////////////////////////////
///////* Random Access Preamble Initialization (5.1.1 TS 38.321) *///////
// This function handles:
// - Random Access Preamble Initialization (5.1.1 TS 38.321)
// - Random Access Response reception (5.1.4 TS 38.321)
/// In the current implementation, RA is 4-step contention free only
/////////////////////////////////////////////////////////////////////////
/// Handling inizialization by PDCCH order, MAC entity or RRC (TS 38.300)
/// Only one RA procedure is ongoing at any point in time in a MAC entity
/// the RA procedure on a SCell shall only be initiated by PDCCH order
/// in the current implementation, RA is contention free only
// todo TS 38.321:
// - check if carrier to use is explicitly signalled then do (1) RA CARRIER SELECTION (SUL, NUL) (2) set PCMAX
// - BWP operation (subclause 5.15 TS 38.321)
// - handle initialization by beam failure recovery
// - beam failure recovery
// - handle initialization by handover
// - handle transmission on DCCH using PRACH (during handover, or sending SR for example)
// - handle DL assignment on PDCCH for RA-RNTI
// - transmission on DCCH using PRACH (during handover, or sending SR for example)
// - take into account MAC CEs in size_sdu (currently hardcoded size to 1 MAC subPDU and 1 padding subheader)
// - fix rrc data req logic
// - retrieve TBS
// - add mac_rrc_nr_data_req_ue, etc ...
// - add the backoff condition here if we have it from a previous RA reponse which failed (i.e. backoff indicator)
uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
fapi_nr_ul_config_prach_pdu *prach_pdu,
module_id_t mod_id,
......@@ -514,16 +483,13 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
NR_UE_MAC_INST_t *mac = get_mac_inst(mod_id);
uint8_t mac_sdus[MAX_NR_ULSCH_PAYLOAD_BYTES];
uint8_t lcid = UL_SCH_LCID_CCCH_MSG3, *payload;
//uint8_t ra_ResponseWindow;
uint16_t size_sdu = 0;
unsigned short post_padding;
//fapi_nr_config_request_t *cfg = &mac->phy_config.config_req;
NR_ServingCellConfigCommon_t *scc = mac->scc;
AssertFatal(scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup != NULL, "In %s: FATAL! nr_rach_ConfigCommon is NULL...\n", __FUNCTION__);
NR_RACH_ConfigCommon_t *setup = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup;
AssertFatal(&setup->rach_ConfigGeneric != NULL, "In %s: FATAL! rach_ConfigGeneric is NULL...\n", __FUNCTION__);
NR_RACH_ConfigGeneric_t *rach_ConfigGeneric = &setup->rach_ConfigGeneric;
//NR_FrequencyInfoDL_t *frequencyInfoDL = scc->downlinkConfigCommon->frequencyInfoDL;
NR_RACH_ConfigDedicated_t *rach_ConfigDedicated = mac->rach_ConfigDedicated;
uint8_t sdu_lcids[NB_RB_MAX] = {0};
......@@ -567,11 +533,6 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
size_sdu += sdu_lengths[0];
}
//mac->RA_tx_frame = frame;
//mac->RA_tx_slot = nr_slot_tx;
//mac->RA_backoff_frame = frame;
//mac->RA_backoff_slot = nr_slot_tx;
if (size_sdu > 0) {
LOG_D(MAC, "[UE %d][%d.%d]: starting initialisation Random Access Procedure...\n", mod_id, frame, nr_slot_tx);
......@@ -580,13 +541,10 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
mac->RA_RAPID_found = 0;
first_Msg3 = 0;
RA_backoff_cnt = 0;
Msg3_size = size_sdu + sizeof(NR_MAC_SUBHEADER_SHORT) + sizeof(NR_MAC_SUBHEADER_SHORT); // TBR global
// todo: add the backoff condition here // TBR remove
Msg3_size = size_sdu + sizeof(NR_MAC_SUBHEADER_SHORT) + sizeof(NR_MAC_SUBHEADER_SHORT);
init_RA(prach_resources, setup, rach_ConfigGeneric, rach_ConfigDedicated);
prach_resources->Msg3 = payload;
nr_get_RA_window(mac);
// Fill in preamble and PRACH resources
......@@ -614,17 +572,7 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
}
} else if (mac->RA_window_cnt != -1) { // RACH is active
////////////////////////////////////////////////////////////////
/////* Random Access Response reception (5.1.4 TS 38.321) */////
////////////////////////////////////////////////////////////////
// Handling ra_responseWindow, RA_PREAMBLE_TRANSMISSION_COUNTER
// and RA_backoff_cnt
// todo:
// - handle beam failure recovery request
// - handle DL assignment on PDCCH for RA-RNTI
// - handle backoff and raResponseWindow params
LOG_D(MAC, "In %s [%d.%d] RA is active: RA window count %d (RA_tx_frame %d, RA_tx_subframe %d)\n", __FUNCTION__, frame, nr_slot_tx, mac->RA_window_cnt, mac->RA_tx_frame, mac->RA_tx_subframe);
LOG_D(MAC, "In %s [%d.%d] RA is active: RA window count %d, RA backoff count %d\n", __FUNCTION__, frame, nr_slot_tx, mac->RA_window_cnt, mac->RA_backoff_cnt);
if (mac->RA_BI_found){
prach_resources->RA_PREAMBLE_BACKOFF = prach_resources->RA_SCALING_FACTOR_BI * mac->RA_backoff_indicator;
......@@ -633,7 +581,6 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
}
if (mac->RA_window_cnt >= 0 && mac->RA_RAPID_found == 1) {
// Reset RA_active flag: it disables Msg3 retransmission (8.3 of TS 38.213)
// TbD Msg3 Retransmissions to be scheduled by DCI 0_0
mac->RA_active = 0;
......@@ -644,7 +591,7 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
} else if (mac->RA_window_cnt == 0 && !mac->RA_RAPID_found) {
LOG_I(MAC, "[MAC][UE %d][RAPROC] Frame %d: nr_slot_tx %d: RAR reception failed \n", mod_id, frame, nr_slot_tx);
LOG_I(MAC, "[UE %d][%d:%d] RAR reception failed \n", mod_id, frame, nr_slot_tx);
mac->ra_state = RA_UE_IDLE;
prach_resources->RA_PREAMBLE_TRANSMISSION_COUNTER++;
......@@ -653,8 +600,11 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
nr_get_RA_window(mac);
if (prach_resources->RA_PREAMBLE_TRANSMISSION_COUNTER == preambleTransMax + 1){
LOG_D(MAC, "[UE %d] Frame %d: Maximum number of RACH attempts (%d)\n", mod_id, frame, preambleTransMax);
RA_backoff_cnt = rand() % (prach_resources->RA_PREAMBLE_BACKOFF + 1);
prach_resources->RA_PREAMBLE_TRANSMISSION_COUNTER = 1;
prach_resources->RA_PREAMBLE_POWER_RAMPING_STEP += prach_resources->RA_PREAMBLE_POWER_RAMPING_STEP << 1; // 2 dB increment
prach_resources->ra_PREAMBLE_RECEIVED_TARGET_POWER = nr_get_Po_NOMINAL_PUSCH(prach_resources, mod_id, CC_id);
......@@ -699,10 +649,13 @@ uint8_t nr_ue_get_rach(NR_PRACH_RESOURCES_t *prach_resources,
}
}
} else if (UE_mode == PUSCH) {
LOG_D(MAC, "[UE %d] FATAL: Should not have checked for RACH in PUSCH yet ...", mod_id);
AssertFatal(1 == 0, "");
AssertFatal(1 == 0, "[UE %d] FATAL: Should not have checked for RACH in PUSCH yet...", mod_id);
}
return mac->generate_nr_prach;
return mac->generate_nr_prach;
}
void nr_get_RA_window(NR_UE_MAC_INST_t *mac){
......
openair2/LAYER2/NR_MAC_UE/rar_tools_nrUE.c
View file @ a30c8075
......@@ -264,7 +264,7 @@ uint16_t nr_ue_process_rar(module_id_t mod_id,
} else {
rarh += sizeof(NR_MAC_RAR) + 1;
}
};
}
#ifdef DEBUG_RAR
LOG_D(MAC, "[DEBUG_RAR] (%d,%d) number of RAR subheader %d; number of RAR pyloads %d\n", frame, slot, n_subheaders, n_subPDUs);
......
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