/******************************************************************************* ################################################################################ # Copyright (c) [2017-2019] [Radisys] # # # # Licensed under the Apache License, Version 2.0 (the "License"); # # you may not use this file except in compliance with the License. # # You may obtain a copy of the License at # # # # http://www.apache.org/licenses/LICENSE-2.0 # # # # Unless required by applicable law or agreed to in writing, software # # distributed under the License is distributed on an "AS IS" BASIS, # # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # # See the License for the specific language governing permissions and # # limitations under the License. # ################################################################################ *******************************************************************************/ /************************************************************************ Name: sch_rach.c Type: C source file Desc: C source code for rach handling functions File: sch_rach.c **********************************************************************/ /** @file sch_rach.c @brief This file implements the rach handling. */ #include "common_def.h" #include "tfu.h" #include "lrg.h" #include "tfu.x" #include "lrg.x" #include "du_log.h" #include "du_app_mac_inf.h" #include "mac_sch_interface.h" #include "sch.h" #include "sch_tmr.h" #include "sch_utils.h" /** * @brief Checks if PRACH can be scheduled in current slot * * @details * * Function : schCheckPrachOcc * * This function checks if PRACH can be scheduled in * current slot * * @param[in] Cell Cb * Slot timing * @return TRUE * FALSE **/ bool schCheckPrachOcc(SchCellCb *cell, SlotTimingInfo prachOccasionTimingInfo) { uint8_t prachCfgIdx = 0; uint8_t x = 0; uint8_t y = 0; uint8_t subFrame = 0; uint16_t prachSubframe = 0; prachCfgIdx = cell->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.prachCfgGeneric.prachCfgIdx; /* derive the prachCfgIdx table paramters */ x = prachCfgIdxTable[prachCfgIdx][1]; y = prachCfgIdxTable[prachCfgIdx][2]; prachSubframe = prachCfgIdxTable[prachCfgIdx][3]; if((prachOccasionTimingInfo.sfn%x) == y) { subFrame = prachOccasionTimingInfo.slot/pow(2, cell->numerology); /* check for subFrame number */ if ((1 << subFrame) & prachSubframe) { /* prach ocassion present in this subframe */ #ifdef NR_TDD if(UL_SLOT != schGetSlotSymbFrmt(prachOccasionTimingInfo.slot % cell->numSlotsInPeriodicity,\ cell->slotFrmtBitMap)) { DU_LOG("\nERROR --> SCH : PrachCfgIdx %d doesn't support UL slot", prachCfgIdx); return FALSE; } #endif return TRUE; } } return FALSE; } /** * @brief Calculate number of PRBs to be allocated for PRACH * * @details * * Function : schCalcPrachNumRb * * Calculate number of PRBs to be allocated for PRACH * * @param[in] SchCellCb *cell, cell cb * @return Number of PRBs **/ uint8_t schCalcPrachNumRb(SchCellCb *cell) { uint8_t tableIdx = 0; uint16_t puschScs = convertScsEnumValToScsVal(cell->cellCfg.ulCfgCommon.schInitialUlBwp.bwp.scs); for(tableIdx=0; tableIdx < MAX_RACH_NUM_RB_IDX; tableIdx++) { if((numRbForPrachTable[tableIdx][0] == cell->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.rootSeqLen) && (numRbForPrachTable[tableIdx][1] == cell->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.msg1SubcSpacing) && (numRbForPrachTable[tableIdx][2] == puschScs)) { return numRbForPrachTable[tableIdx][3]; } } return 0; } /** * @brief resource allocation for PRACH * * @details * * Function : schPrachResAlloc * * This function handles PRACH allocation * * @param[in] SchCellCb *cell, cell cb * @param[in] UlSchedInfo *ulSchedInfo, UL scheduling info * @return void **/ void schPrachResAlloc(SchCellCb *cell, UlSchedInfo *ulSchedInfo, SlotTimingInfo prachOccasionTimingInfo) { uint8_t numPrachRb = 0; uint8_t numRa = 0; uint8_t prachCfgIdx = 0; uint8_t prachFormat = 0; uint8_t prachStartSymbol = 0; uint8_t prachDuration = 0; uint8_t prachOcas = 0; uint8_t dataType = 0; uint16_t freqStart = 0; if(cell == NULLP) { DU_LOG("\nERROR --> SCH : schPrachResAlloc(): Received cellCb is null"); return; } /* If this slot is not a PRACH occassion, return */ if(!schCheckPrachOcc(cell, prachOccasionTimingInfo)) return; prachCfgIdx = cell->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.prachCfgGeneric.prachCfgIdx; prachFormat = prachCfgIdxTable[prachCfgIdx][0]; prachStartSymbol = prachCfgIdxTable[prachCfgIdx][4]; prachOcas = prachCfgIdxTable[prachCfgIdx][6]; prachDuration = prachCfgIdxTable[prachCfgIdx][7]; /* numRa determined as 𝑛 belonging {0,1,.., M − 1}, * where M is given by msg1Fdm */ numRa = (cell->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.prachCfgGeneric.msg1Fdm - 1); /* freq domain resource determination for RACH*/ freqStart = cell->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.prachCfgGeneric.msg1FreqStart; numPrachRb = schCalcPrachNumRb(cell); /* Allocate PRACH resources from the UL resource bitmap */ allocatePrbUl(cell, prachOccasionTimingInfo, prachStartSymbol, prachDuration, &freqStart, numPrachRb); /* prach info */ dataType |= SCH_DATATYPE_PRACH; ulSchedInfo->dataType = dataType; ulSchedInfo->prachSchInfo.numPrachOcas = prachOcas; ulSchedInfo->prachSchInfo.prachFormat = prachFormat; ulSchedInfo->prachSchInfo.numRa = numRa; ulSchedInfo->prachSchInfo.prachStartSymb = prachStartSymbol; DU_LOG("\nINFO --> SCH : RACH occassion set for slot %d", prachOccasionTimingInfo.slot); } /** * @brief Process RACH resource request for CFRA * * @details * * Function : SchProcRachRsrcReq * * This function processes RACH resorce request * from MAC for CFRA. It assigns a dedicated preamble * to the UE and sends the same in RACH resource * response * * @param[in] Post structure * @param[in] RACH resource request * @return ROK * RFAILED **/ uint8_t SchProcRachRsrcReq(Pst *pst, SchRachRsrcReq *schRachRsrcReq) { uint8_t ssbIdx = 0, cfraSsbIdx = 0; uint8_t firstCFPreambleIndex = 0, lastCFPreambleIndex = 0; uint16_t cellIdx = 0; uint64_t mask = 0; Pst rspPst; Inst inst = pst->dstInst - SCH_INST_START; SchCellCb *cellCb = NULLP; SchUeCb *ueCb = NULLP; SchRachRsrcRsp *rachRsrcRsp = NULLP; DU_LOG("\nINFO --> SCH : Received RACH resource request for Cell ID [%d] CRNTI [%d]", \ schRachRsrcReq->cellId, schRachRsrcReq->crnti); /* Fill RACH resource response to MAC */ SCH_ALLOC(rachRsrcRsp, sizeof(SchRachRsrcRsp)); if(!rachRsrcRsp) { DU_LOG("\nERROR --> SCH : Memory allocation failed for RACH resource response"); return RFAILED; } rachRsrcRsp->cellId = schRachRsrcReq->cellId; rachRsrcRsp->crnti = schRachRsrcReq->crnti; rachRsrcRsp->result = RSP_OK; /* Fill SCH to MAC Pst structure */ memset(&rspPst, 0, sizeof(Pst)); FILL_PST_SCH_TO_MAC(rspPst, inst); rspPst.event = EVENT_RACH_RESOURCE_RESPONSE_TO_MAC; /* Fetch Cell CB */ for(cellIdx = 0; cellIdx < MAX_NUM_CELL; cellIdx++) { if((schCb[inst].cells[cellIdx]) && (schCb[inst].cells[cellIdx]->cellId == schRachRsrcReq->cellId)) { cellCb = schCb[inst].cells[cellIdx]; break; } } if(cellCb) { /* Fetch UE CB */ ueCb = schGetUeCb(cellCb, schRachRsrcReq->crnti); if(ueCb->crnti != schRachRsrcReq->crnti) { DU_LOG("\nERROR --> SCH : CRNTI [%d] not found" ,schRachRsrcReq->crnti); rachRsrcRsp->result = RSP_NOK; } } else { DU_LOG("\nERROR --> SCH : Cell ID [%d] not found" ,schRachRsrcReq->cellId); rachRsrcRsp->result = RSP_NOK; } /* Allocate SSB resource if no failure has occurred until this step */ if(rachRsrcRsp->result == RSP_OK) { /* Find first free preamble index from the pool CF preambles * Preamble index from 0 to (numCbPreamblePerSsb-1) is used for CBRA * Preamble index from numCbPreamblePerSsb to totalNumOfRAPreamble * is used for CFRA */ firstCFPreambleIndex = cellCb->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.numCbPreamblePerSsb; lastCFPreambleIndex = cellCb->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.totalNumRaPreamble; /* Allocate resource for each SSB index requested */ for(ssbIdx = 0; ssbIdx < schRachRsrcReq->numSsb; ssbIdx++) { /* Find the first CF Preamble index not dedicated to any UE currently */ while(firstCFPreambleIndex <= lastCFPreambleIndex) { mask = 1 << firstCFPreambleIndex; if(cellCb->dedPreambleBitMap & mask) { firstCFPreambleIndex++; continue; } else break; } /* If firstCFPreambleIndex > lastCFPreambleIndex, it means all * dedicated preambles are in use currently. In such a case, CBRA * should be initiated. * If a dedicated preamble is found, use this for CFRA and mark it as * IN-USE in the bitmap. * Considering only CFRA scenario for now. */ if(firstCFPreambleIndex <= lastCFPreambleIndex) { ueCb->cfraResource.ssbResource[cfraSsbIdx].ssbIdx = schRachRsrcReq->ssbIdx[ssbIdx]; ueCb->cfraResource.ssbResource[cfraSsbIdx].raPreambleIdx = firstCFPreambleIndex; SET_ONE_BIT(firstCFPreambleIndex, cellCb->dedPreambleBitMap); cfraSsbIdx++; firstCFPreambleIndex++; } else { DU_LOG("\nINFO : SCH : No dedicated preameble availble to assign to ssbIdx[%d]", schRachRsrcReq->ssbIdx[ssbIdx]); /* Breaking out of for loop since no dedicated preambles are available * for remaining ssbIdx too */ break; } } /* End of for */ ueCb->cfraResource.numSsb = cfraSsbIdx; if(ueCb->cfraResource.numSsb == 0) { /* If numSsb is 0, it means no CFRA resource was alloacted for any of the * SSB Idx, hence send a negative response */ rachRsrcRsp->result = RSP_NOK; } else { /* Send ssb resource information to MAC in RACH resource response */ rachRsrcRsp->cfraResource.numSsb = ueCb->cfraResource.numSsb; memcpy(rachRsrcRsp->cfraResource.ssbResource, ueCb->cfraResource.ssbResource, \ ueCb->cfraResource.numSsb * sizeof(SchCfraSsbResource)); } } /* End of if */ /* Free RACH resource request memory allocated by MAC */ SCH_FREE(schRachRsrcReq, sizeof(SchRachRsrcReq)); /* Send RACH resource response to MAC */ return(MacMessageRouter(&rspPst, (void *)rachRsrcRsp)); } /** * @brief calculate ra-rnti function. * * @details * * Function : calculateRaRnti * * This function calculates ra-rnti * * @param[in] symbol index * @param[in] slot index * @param[in] frequency index * @return ra-rnti **/ uint16_t calculateRaRnti(uint8_t symbolIdx, uint8_t slotIdx, uint8_t freqIdx) { uint16_t raRnti = 0; uint8_t ulCarrierIdx = 0; /* Uplink carrier used for MSG1 transmission. 0:NUL carrier; 1:SUL carrier */ /* Refer to spec 38.321, section 5.1.3 */ raRnti = (1 + symbolIdx + (14*slotIdx) + (14*80*freqIdx) + (14*80*8*ulCarrierIdx)); return raRnti; } /** * @brief create raCb function. * * @details * * Function : createSchRaCb * * This function create raCb * * @param[in] crnti * @param[in] shed instance * @return void **/ void createSchRaCb(uint8_t ueId, SchRaReq *raReq, Inst schInst) { if(raReq->isCFRA) { /* If a UE in handover has triggered CFRA, its UE CB context is already present in SCH, * Hence, no need to create raCb */ if(raReq->ueCb && (raReq->ueCb->state == SCH_UE_HANDIN_IN_PROGRESS)) { schCb[schInst].cells[schInst]->numActvUe++; SET_ONE_BIT(raReq->ueCb->ueId, schCb[schInst].cells[schInst]->actvUeBitMap); raReq->ueCb->state = SCH_UE_STATE_ACTIVE; schCb[schInst].cells[schInst]->raCb[ueId -1].raState = SCH_RA_STATE_MSG4_DONE; } } else { /* Create RA CB only for CB-RA to use for msg3 and msg4 processing */ GET_UE_ID(raReq->rachInd->crnti, ueId); schCb[schInst].cells[schInst]->raCb[ueId -1].tcrnti = raReq->rachInd->crnti; schCb[schInst].cells[schInst]->raCb[ueId -1].msg4recvd = FALSE; schCb[schInst].cells[schInst]->raCb[ueId -1].raState = SCH_RA_STATE_MSG3_PENDING; } schCb[schInst].cells[schInst]->raCb[ueId -1].cell = schCb[schInst].cells[schInst]; } /** * @brief resource allocation for msg3 PUSCH * * @details * * Function : schAllocMsg3Pusch * * This function handles msg3 PUSCH allocation * * @param[in] Inst schInst, SCH instance * @param[in] slot, current slot * @param[out] msg3StartRb * @param[out] msg3NumRb * @return void **/ SchPuschInfo* schAllocMsg3Pusch(Inst schInst, uint16_t crnti, uint8_t k2Index, SlotTimingInfo msg3SlotTime, SchUlHqProcCb* msg3HqProc, bool isRetx) { SchCellCb *cell = NULLP; SchUlSlotInfo *schUlSlotInfo = NULLP; uint8_t mcs = DEFAULT_MCS; uint8_t startSymb = 0; uint8_t symbLen = 0; uint16_t startRb = 0; uint16_t numRb = 0; uint16_t tbSize = 0; cell = schCb[schInst].cells[schInst]; if(cell == NULL) { DU_LOG("\n\nERROR --> SCH : Failed to find cell in schAllocMsg3Pusch"); return NULLP; } /* Allocate time-domain and frequency-domain resource for MSG3 PUSCH */ startSymb = cell->cellCfg.ulCfgCommon.schInitialUlBwp.puschCommon.timeDomRsrcAllocList[k2Index].startSymbol; symbLen = cell->cellCfg.ulCfgCommon.schInitialUlBwp.puschCommon.timeDomRsrcAllocList[k2Index].symbolLength; startRb = MAX_NUM_RB; tbSize = schCalcTbSize(8); /* 6 bytes msg3 and 2 bytes header */ numRb = schCalcNumPrb(tbSize, mcs, symbLen); numRb++; /* allocating 1 extra RB for now */ allocatePrbUl(cell, msg3SlotTime, startSymb, symbLen, &startRb, numRb); /* Fill PUSCH scheduling details in Slot structure */ schUlSlotInfo = cell->schUlSlotInfo[msg3SlotTime.slot]; SCH_ALLOC(schUlSlotInfo->schPuschInfo, sizeof(SchPuschInfo)); if(!schUlSlotInfo->schPuschInfo) { DU_LOG("\nERROR --> SCH : Memory allocation failed in schAllocMsg3Pusch"); return NULLP; } tbSize = 0; /* since nPrb has been incremented, recalculating tbSize */ tbSize = schCalcTbSizeFromNPrb(numRb, mcs, NUM_PDSCH_SYMBOL); tbSize = tbSize / 8 ; /*bits to byte conversion*/ schUlSlotInfo->schPuschInfo->harqProcId = msg3HqProc->procId; schUlSlotInfo->schPuschInfo->fdAlloc.resAllocType = SCH_ALLOC_TYPE_1; schUlSlotInfo->schPuschInfo->fdAlloc.resAlloc.type1.startPrb = startRb; schUlSlotInfo->schPuschInfo->fdAlloc.resAlloc.type1.numPrb = numRb; schUlSlotInfo->schPuschInfo->tdAlloc.startSymb = startSymb; schUlSlotInfo->schPuschInfo->tdAlloc.numSymb = symbLen; schUlSlotInfo->schPuschInfo->tbInfo.qamOrder = QPSK_MODULATION; /* QPSK modulation */ schUlSlotInfo->schPuschInfo->tbInfo.mcs = mcs; schUlSlotInfo->schPuschInfo->tbInfo.mcsTable = SCH_MCS_TABLE_QAM_64; schUlSlotInfo->schPuschInfo->tbInfo.ndi = NEW_TRANSMISSION; /* new transmission */ schUlSlotInfo->schPuschInfo->tbInfo.rv = 0; schUlSlotInfo->schPuschInfo->tbInfo.tbSize = tbSize; #ifdef INTEL_FAPI schUlSlotInfo->schPuschInfo->dmrsMappingType = DMRS_MAP_TYPE_A; /* Setting Type-A */ schUlSlotInfo->schPuschInfo->nrOfDmrsSymbols = NUM_DMRS_SYMBOLS; schUlSlotInfo->schPuschInfo->dmrsAddPos = DMRS_ADDITIONAL_POS; #endif if(!isRetx) { msg3HqProc->strtSymbl = startSymb; msg3HqProc->numSymbl = symbLen; msg3HqProc->puschResType = schUlSlotInfo->schPuschInfo->fdAlloc.resAllocType; msg3HqProc->puschStartPrb = schUlSlotInfo->schPuschInfo->fdAlloc.resAlloc.type1.startPrb; msg3HqProc->puschNumPrb = schUlSlotInfo->schPuschInfo->fdAlloc.resAlloc.type1.numPrb; msg3HqProc->tbInfo.qamOrder = schUlSlotInfo->schPuschInfo->tbInfo.qamOrder; msg3HqProc->tbInfo.iMcs = schUlSlotInfo->schPuschInfo->tbInfo.mcs; msg3HqProc->tbInfo.mcsTable = schUlSlotInfo->schPuschInfo->tbInfo.mcsTable; msg3HqProc->tbInfo.ndi = schUlSlotInfo->schPuschInfo->tbInfo.ndi; msg3HqProc->tbInfo.rv = schUlSlotInfo->schPuschInfo->tbInfo.rv; msg3HqProc->tbInfo.tbSzReq = schUlSlotInfo->schPuschInfo->tbInfo.tbSize; #ifdef INTEL_FAPI msg3HqProc->dmrsMappingType = schUlSlotInfo->schPuschInfo->dmrsMappingType; msg3HqProc->nrOfDmrsSymbols = schUlSlotInfo->schPuschInfo->nrOfDmrsSymbols; msg3HqProc->dmrsAddPos = schUlSlotInfo->schPuschInfo->dmrsAddPos; #endif } return schUlSlotInfo->schPuschInfo; } /** * @brief Check if a time frame is in RA Response window * * @details * * Function : isInRaRspWindow * * Check if a time frame is in RA Response window * * @param[in] RA request * @param[in] Time frame to check * @param[in] Total number of slot per radio frame * @return true * @return false **/ RaRspWindowStatus isInRaRspWindow(SchRaReq *raReq, SlotTimingInfo frameToCheck, uint16_t numSlotsPerSystemFrame) { uint32_t winStartTime, winEndTime, timeToCheck; winStartTime = (raReq->winStartTime.sfn * numSlotsPerSystemFrame) + raReq->winStartTime.slot; winEndTime = (raReq->winEndTime.sfn * numSlotsPerSystemFrame) + raReq->winEndTime.slot; timeToCheck = (frameToCheck.sfn * numSlotsPerSystemFrame) + frameToCheck.slot; /* TODO : check how to handle the wrap around scenario of MAX_SFN */ if((timeToCheck >= winStartTime) && (timeToCheck <= winEndTime)) return WITHIN_WINDOW; else if(timeToCheck < winStartTime) return WINDOW_YET_TO_START; return WINDOW_EXPIRED; } /** * @brief Processes any pending RA request * * @details * * Function : schProcessRaReq * * This function process pending RA request * * @param[in] Current timing of the cell * @return ROK **/ bool schProcessRaReq(Inst schInst, SchCellCb *cell, SlotTimingInfo currTime, uint8_t ueId) { bool k1Found = false, k2Found = false; uint8_t k0TblIdx = 0, k1TblIdx = 0, k2TblIdx = 0; uint8_t k0Index = 0, k1Index = 0, k2Index = 0; uint8_t k0 = 0, k1 = 0, k2 = 0; uint8_t numK1 = 0; uint8_t puschMu = 0; uint8_t msg3Delta = 0, msg3MinSchTime = 0; #ifdef NR_TDD uint8_t totalCfgSlot = 0; #endif uint16_t dciSlot = 0, rarSlot = 0; SlotTimingInfo dciTime, rarTime, msg3Time, pucchTime; RarAlloc *dciSlotAlloc = NULLP; /* Stores info for transmission of PDCCH for RAR */ RarAlloc *rarSlotAlloc = NULLP; /* Stores info for transmission of RAR PDSCH */ SchPuschInfo *msg3PuschInfo = NULLP; /* Stores MSG3 PUSCH scheduling information */ SchK0K1TimingInfoTbl *k0K1InfoTbl=NULLP; SchK2TimingInfoTbl *msg3K2InfoTbl=NULLP; RaRspWindowStatus windowStatus=0; #ifdef NR_TDD totalCfgSlot = calculateSlotPatternLength(cell->cellCfg.ssbScs, cell->cellCfg.tddCfg.tddPeriod); #endif k0K1InfoTbl = &cell->k0K1InfoTbl; if(cell->raReq[ueId-1]->isCFRA == false) { msg3K2InfoTbl = &cell->msg3K2InfoTbl; puschMu = cell->numerology; msg3Delta = puschDeltaTable[puschMu]; msg3MinSchTime = minMsg3SchTime[cell->numerology]; } /* Calculating time frame to send DCI for RAR */ ADD_DELTA_TO_TIME(currTime, dciTime, PHY_DELTA_DL + SCHED_DELTA, cell->numSlots); dciSlot = dciTime.slot; #ifdef NR_TDD /* Consider this slot for sending DCI, only if it is a DL slot */ if(schGetSlotSymbFrmt(dciSlot, cell->slotFrmtBitMap) == DL_SLOT) #endif { /* If PDCCH is already scheduled on this slot, cannot schedule PDSCH for another UE here. */ if(cell->schDlSlotInfo[dciSlot]->pdcchUe != 0) return false; /* Check if this slot is within RA response window */ windowStatus = isInRaRspWindow(cell->raReq[ueId-1], dciTime, cell->numSlots); if(windowStatus == WITHIN_WINDOW) { /* For all k0 values, search for a suitable k2 value to schedule MSG3. * RAR DCI, RAR PDSCH and MSG3 is scheduled only if one such k0-k2 combination * is found. Else no scheduling happens. */ for(k0TblIdx = 0; k0TblIdx < k0K1InfoTbl->k0k1TimingInfo[dciSlot].numK0; k0TblIdx++) { k0Index = k0K1InfoTbl->k0k1TimingInfo[dciSlot].k0Indexes[k0TblIdx].k0Index; k0 = cell->cellCfg.dlCfgCommon.schInitialDlBwp.pdschCommon.timeDomRsrcAllocList[k0Index].k0; /* Calculating time frame to send RAR PDSCH */ ADD_DELTA_TO_TIME(dciTime, rarTime, k0, cell->numSlots); rarSlot = rarTime.slot; /* If PDSCH is already scheduled on this slot, cannot schedule PDSCH for another UE here. */ if(cell->schDlSlotInfo[rarSlot]->pdschUe != 0) continue; /* If Contention-FREE RA is in progress, allocate resources for * PUCCH for next UL message */ if(cell->raReq[ueId-1]->isCFRA) { numK1 = k0K1InfoTbl->k0k1TimingInfo[dciTime.slot].k0Indexes[k0TblIdx].k1TimingInfo.numK1; for(k1TblIdx = 0; k1TblIdx < numK1; k1TblIdx++) { k1Index = k0K1InfoTbl->k0k1TimingInfo[dciTime.slot].k0Indexes[k0TblIdx].k1TimingInfo.k1Indexes[k1TblIdx]; if(cell->raReq[ueId-1]->ueCb->ueCfg.spCellCfg.servCellRecfg.initUlBwp.pucchCfg.dlDataToUlAck) { k1 = cell->raReq[ueId-1]->ueCb->ueCfg.spCellCfg.servCellRecfg.initUlBwp.pucchCfg.dlDataToUlAck->\ dlDataToUlAckList[k1Index]; } else { k1 = defaultUlAckTbl[k1Index]; } ADD_DELTA_TO_TIME(rarTime, pucchTime, k1, cell->numSlots); #ifdef NR_TDD if(schGetSlotSymbFrmt(pucchTime.slot, cell->slotFrmtBitMap) == DL_SLOT) continue; #endif if(cell->schUlSlotInfo[pucchTime.slot]->pucchUe != 0) continue; k1Found = true; break; } } else { /* Else if contention-based RA is in progress, allocate resources for MSG3 */ for(k2TblIdx = 0; k2TblIdx < msg3K2InfoTbl->k2TimingInfo[rarSlot].numK2; k2TblIdx++) { k2Index = msg3K2InfoTbl->k2TimingInfo[rarSlot].k2Indexes[k2TblIdx]; k2 = cell->cellCfg.ulCfgCommon.schInitialUlBwp.puschCommon.timeDomRsrcAllocList[k2Index].k2; /* Delta is added to the slot allocation for msg3 based on 38.214 section 6.1.2.1 */ k2 = k2 + msg3Delta; if(k2 >= msg3MinSchTime) { ADD_DELTA_TO_TIME(rarTime, msg3Time, k2, cell->numSlots); #ifdef NR_TDD if(schGetSlotSymbFrmt(msg3Time.slot % totalCfgSlot, cell->slotFrmtBitMap) == DL_SLOT) continue; #endif /* If PUSCH is already scheduled on this slot, another PUSCH * pdu cannot be scheduled here */ if(cell->schUlSlotInfo[msg3Time.slot]->puschUe != 0) continue; k2Found = true; break; } } } if(k1Found || k2Found) break; } } else if(windowStatus == WINDOW_EXPIRED) { SCH_FREE(cell->raReq[ueId-1]->rachInd, sizeof(RachIndInfo)); SCH_FREE(cell->raReq[ueId-1], sizeof(SchRaReq)); return false; } /* If K0-K2 and K0-K1 combination not found, no scheduling happens */ if(!k1Found && !k2Found) return false; /* Allocate memory for RAR PDCCH slot, pointer will be checked at schProcessSlotInd() */ SCH_ALLOC(dciSlotAlloc, sizeof(RarAlloc)); if(dciSlotAlloc == NULLP) { DU_LOG("\nERROR --> SCH : Memory Allocation failed for dciSlotAlloc"); return false; } cell->schDlSlotInfo[dciSlot]->rarAlloc[ueId-1] = dciSlotAlloc; /* Fill PDCCH and PDSCH scheduling information for RAR */ if((schFillRar(cell, rarTime, ueId, dciSlotAlloc, k0Index)) != ROK) { DU_LOG("\nERROR --> SCH: Scheduling of RAR failed in slot [%d]", rarSlot); if(!dciSlotAlloc->rarPdschCfg) { SCH_FREE(dciSlotAlloc, sizeof(RarAlloc)); cell->schDlSlotInfo[dciSlot]->rarAlloc[ueId-1] = NULLP; } return false; } /* Fill RAR info */ dciSlotAlloc->raRnti = cell->raReq[ueId-1]->raRnti; dciSlotAlloc->rarInfo.tcrnti = cell->raReq[ueId-1]->rachInd->crnti; dciSlotAlloc->rarInfo.RAPID = cell->raReq[ueId-1]->rachInd->preambleIdx; dciSlotAlloc->rarInfo.ta = cell->raReq[ueId-1]->rachInd->timingAdv; if(cell->raReq[ueId-1]->isCFRA) { /* Allocate resources for PUCCH */ schAllocPucchResource(cell, pucchTime, cell->raReq[ueId-1]->rachInd->crnti,NULLP, FALSE, NULLP); } else { /* Allocate resources for msg3 */ msg3PuschInfo = schAllocMsg3Pusch(schInst, cell->raReq[ueId-1]->rachInd->crnti, k2Index, msg3Time, &(cell->raCb[ueId-1].msg3HqProc), FALSE); if(msg3PuschInfo) { dciSlotAlloc->rarInfo.ulGrant.bwpSize = cell->cellCfg.ulCfgCommon.schInitialUlBwp.bwp.freqAlloc.numPrb; /* Spec 38.213, section 8.2, 0 : MSG3 PUSCH will be transmitted without frequency hopping */ dciSlotAlloc->rarInfo.ulGrant.freqHopFlag = 0; dciSlotAlloc->rarInfo.ulGrant.msg3FreqAlloc.startPrb = msg3PuschInfo->fdAlloc.resAlloc.type1.startPrb; dciSlotAlloc->rarInfo.ulGrant.msg3FreqAlloc.numPrb = msg3PuschInfo->fdAlloc.resAlloc.type1.numPrb; dciSlotAlloc->rarInfo.ulGrant.k2Index = k2Index; dciSlotAlloc->rarInfo.ulGrant.mcs = msg3PuschInfo->tbInfo.mcs; dciSlotAlloc->rarInfo.ulGrant.tpc = 3; /* TODO : Check appropriate value to be filled */ /* Spec 38.213, section 8.2 : In a contention based random access * procedure, the CSI request field is reserved. */ dciSlotAlloc->rarInfo.ulGrant.csiReq = 0; } } /* Check if both DCI and RAR are sent in the same slot. * If not, allocate memory RAR PDSCH slot to store RAR info */ if(dciSlot == rarSlot) { SCH_ALLOC(dciSlotAlloc->rarPdschCfg, sizeof(PdschCfg)); if(dciSlotAlloc->rarPdschCfg) { memcpy(dciSlotAlloc->rarPdschCfg, &dciSlotAlloc->rarPdcchCfg->dci[0].pdschCfg, sizeof(PdschCfg)); } else { SCH_FREE(dciSlotAlloc->rarPdcchCfg, sizeof(PdcchCfg)); SCH_FREE(dciSlotAlloc, sizeof(RarAlloc)); cell->schDlSlotInfo[dciSlot]->rarAlloc[ueId-1] = NULLP; DU_LOG("\nERROR --> SCH : Memory Allocation failed for dciSlotAlloc->rarPdschCfg"); return false; } } else { /* Allocate memory to schedule rarSlot to send RAR, pointer will be checked at schProcessSlotInd() */ SCH_ALLOC(rarSlotAlloc, sizeof(RarAlloc)); if(rarSlotAlloc == NULLP) { DU_LOG("\nERROR --> SCH : Memory Allocation failed for rarSlotAlloc"); SCH_FREE(dciSlotAlloc->rarPdcchCfg, sizeof(PdcchCfg)); if(!dciSlotAlloc->rarPdschCfg) { SCH_FREE(dciSlotAlloc, sizeof(RarAlloc)); cell->schDlSlotInfo[dciSlot]->rarAlloc[ueId-1] = NULLP; } return false; } cell->schDlSlotInfo[rarSlot]->rarAlloc[ueId-1] = rarSlotAlloc; /* Copy all RAR info */ rarSlotAlloc->raRnti = dciSlotAlloc->raRnti; rarSlotAlloc->bwp = dciSlotAlloc->bwp; SCH_ALLOC(rarSlotAlloc->rarPdschCfg, sizeof(PdschCfg)); if(rarSlotAlloc->rarPdschCfg) { memcpy(rarSlotAlloc->rarPdschCfg, &dciSlotAlloc->rarPdcchCfg->dci[0].pdschCfg,sizeof(PdschCfg)); } else { DU_LOG("\nERROR --> SCH : Memory Allocation failed for rarSlotAlloc->rarPdschCfg"); SCH_FREE(dciSlotAlloc->rarPdcchCfg, sizeof(PdcchCfg)); if(!dciSlotAlloc->rarPdschCfg) { SCH_FREE(dciSlotAlloc, sizeof(RarAlloc)); cell->schDlSlotInfo[dciSlot]->rarAlloc[ueId-1] = NULLP; } SCH_FREE(rarSlotAlloc, sizeof(RarAlloc)); cell->schDlSlotInfo[rarSlot]->rarAlloc[ueId-1] = NULLP; return false; } } cell->schDlSlotInfo[dciSlot]->pdcchUe = ueId; cell->schDlSlotInfo[rarSlot]->pdschUe = ueId; if(cell->raReq[ueId-1]->isCFRA) cell->schUlSlotInfo[pucchTime.slot]->pucchUe = ueId; else cell->schUlSlotInfo[msg3Time.slot]->puschUe = ueId; /* Create raCb at SCH */ createSchRaCb(ueId, cell->raReq[ueId-1], schInst); /* Remove RachInd from pending RA request list */ SCH_FREE(cell->raReq[ueId-1]->rachInd, sizeof(RachIndInfo)); SCH_FREE(cell->raReq[ueId-1], sizeof(SchRaReq)); return true; } return false; } /** * @brief process rach indication function. * * @details * * Function : SchProcRachInd * * This function process rach indication * * @param[in] rachInd parameters * @param[in] shed instance * @return ROK **/ uint8_t SchProcRachInd(Pst *pst, RachIndInfo *rachInd) { SchRaReq *raReq = NULLP; float slotDuration; uint8_t winNumSlots; uint8_t ueId; Inst schInst = pst->dstInst-SCH_INST_START; SchCellCb *cell = schCb[schInst].cells[schInst]; DU_LOG("\nINFO --> SCH : Received Rach indication"); if(cell == NULLP) { DU_LOG("\nERROR --> SCH: Failed to find cell in SchProcRachInd"); return RFAILED; } /* Storing RA request in cellCb */ GET_UE_ID(rachInd->crnti, ueId); if(ueId <= 0) { DU_LOG("\nERROR --> SCH: Invalid CRNTI [%d]", rachInd->crnti); return RFAILED; } SCH_ALLOC(raReq, sizeof(SchRaReq)); if(!raReq) { DU_LOG("\nERROR --> SCH : Memory allocation failure in SchProcRachInd"); SCH_FREE(rachInd, sizeof(RachIndInfo)); return RFAILED; } /* calculate the ra-rnti value */ raReq->raRnti = calculateRaRnti(rachInd->symbolIdx, rachInd->slotIdx, rachInd->freqIdx); raReq->rachInd = rachInd; if((cell->ueCb[ueId-1].crnti == rachInd->crnti) && (cell->ueCb[ueId-1].state == SCH_UE_HANDIN_IN_PROGRESS)) { raReq->isCFRA = true; raReq->ueCb = &cell->ueCb[ueId-1]; } else raReq->isCFRA = false; raReq->winStartTime.sfn = rachInd->timingInfo.sfn; raReq->winStartTime.slot = rachInd->timingInfo.slot; /* Converting window size from ms to number of slots */ slotDuration = (1 / pow(2, cell->numerology)); winNumSlots = (float)cell->cellCfg.ulCfgCommon.schInitialUlBwp.schRachCfg.prachCfgGeneric.raRspWindow / slotDuration; /* Adding window size to window start time to get window end time */ ADD_DELTA_TO_TIME(raReq->winStartTime, raReq->winEndTime, winNumSlots, cell->numSlots); cell->raReq[ueId -1] = raReq; /* Adding UE Id to list of pending UEs to be scheduled */ cell->api->SchRachInd(cell, ueId); return ROK; } /** * @brief fill RAR info function. * * @details * * Function : calculateRaRnti * * This function fills pdcch and pdsch info for RAR * * @param[in] rar Allocation info * @param[in] ra-rnti * @param[in] PCI * @param[in] offset to pointA to determine freq alloc * @return ROK **/ uint8_t schFillRar(SchCellCb *cell, SlotTimingInfo rarTime, uint16_t ueId, RarAlloc *rarAlloc, uint8_t k0Index) { uint8_t coreset0Idx = 0; uint8_t firstSymbol = 0, numSymbols = 0; uint8_t mcs = DEFAULT_MCS; /* MCS fixed to 4 */ uint8_t dmrsStartSymbol, startSymbol, numSymbol ; uint16_t numRbs = 0; uint16_t tbSize = 0; PdschCfg *pdsch; SchBwpDlCfg *initialBwp = &cell->cellCfg.dlCfgCommon.schInitialDlBwp; SCH_ALLOC(rarAlloc->rarPdcchCfg, sizeof(PdcchCfg)); if(rarAlloc->rarPdcchCfg == NULLP) { DU_LOG("\nERROR --> SCH : Memory allocation failed in %s",__func__); return RFAILED; } PdcchCfg *pdcch = rarAlloc->rarPdcchCfg; BwpCfg *bwp = &rarAlloc->bwp; /* derive the sib1 coreset0 params from table 13-1 spec 38.213 */ coreset0Idx = initialBwp->pdcchCommon.commonSearchSpace.coresetId; numRbs = coresetIdxTable[coreset0Idx][1]; numSymbols = coresetIdxTable[coreset0Idx][2]; /* calculate time domain parameters */ // note: since slot value is made sl1, RAR can be sent at all slots uint16_t mask = 0x2000; for(firstSymbol=0; firstSymbolpdcchCommon.commonSearchSpace.monitoringSymbol & mask) break; else mask = mask>>1; } /* fill BWP */ bwp->freqAlloc.numPrb = initialBwp->bwp.freqAlloc.numPrb; bwp->freqAlloc.startPrb = initialBwp->bwp.freqAlloc.startPrb; bwp->subcarrierSpacing = initialBwp->bwp.scs; bwp->cyclicPrefix = initialBwp->bwp.cyclicPrefix; /* fill the PDCCH PDU */ pdcch->coresetCfg.startSymbolIndex = firstSymbol; pdcch->coresetCfg.durationSymbols = numSymbols; memcpy(pdcch->coresetCfg.freqDomainResource, \ cell->cellCfg.dlCfgCommon.schInitialDlBwp.pdcchCommon.commonSearchSpace.freqDomainRsrc, FREQ_DOM_RSRC_SIZE); pdcch->coresetCfg.cceRegMappingType = 1; /* coreset0 is always interleaved */ pdcch->coresetCfg.regBundleSize = 6; /* spec-38.211 sec 7.3.2.2 */ pdcch->coresetCfg.interleaverSize = 2; /* spec-38.211 sec 7.3.2.2 */ pdcch->coresetCfg.coreSetType = 0; pdcch->coresetCfg.coreSetSize = numRbs; pdcch->coresetCfg.shiftIndex = cell->cellCfg.phyCellId; pdcch->coresetCfg.precoderGranularity = 0; /* sameAsRegBundle */ pdcch->numDlDci = 1; pdcch->dci[0].rnti = cell->raReq[ueId-1]->raRnti; /* RA-RNTI */ pdcch->dci[0].scramblingId = cell->cellCfg.phyCellId; pdcch->dci[0].scramblingRnti = 0; pdcch->dci[0].cceIndex = 4; /* considering SIB1 is sent at cce 0-1-2-3 */ pdcch->dci[0].aggregLevel = 4; pdcch->dci[0].beamPdcchInfo.numPrgs = 1; pdcch->dci[0].beamPdcchInfo.prgSize = 1; pdcch->dci[0].beamPdcchInfo.digBfInterfaces = 0; pdcch->dci[0].beamPdcchInfo.prg[0].pmIdx = 0; pdcch->dci[0].beamPdcchInfo.prg[0].beamIdx[0] = 0; pdcch->dci[0].txPdcchPower.beta_pdcch_1_0 = 0; pdcch->dci[0].txPdcchPower.powerControlOffsetSS = 0; pdsch = &pdcch->dci[0].pdschCfg; /* fill the PDSCH PDU */ uint8_t cwCount = 0; pdsch->pduBitmap = 0; /* PTRS and CBG params are excluded */ pdsch->rnti = cell->raReq[ueId-1]->raRnti; /* RA-RNTI */ pdsch->pduIndex = 0; pdsch->numCodewords = 1; for(cwCount = 0; cwCount < pdsch->numCodewords; cwCount++) { pdsch->codeword[cwCount].targetCodeRate = 308; pdsch->codeword[cwCount].qamModOrder = 2; pdsch->codeword[cwCount].mcsIndex = mcs; /* mcs configured to 4 */ pdsch->codeword[cwCount].mcsTable = 0; /* notqam256 */ pdsch->codeword[cwCount].rvIndex = 0; /* RAR PDU length and FAPI payload header length */ tbSize = schCalcTbSize(RAR_PAYLOAD_SIZE + TX_PAYLOAD_HDR_LEN); pdsch->codeword[cwCount].tbSize = tbSize; } pdsch->dataScramblingId = cell->cellCfg.phyCellId; pdsch->numLayers = 1; pdsch->transmissionScheme = 0; pdsch->refPoint = 0; pdsch->dmrs.dlDmrsSymbPos = DL_DMRS_SYMBOL_POS; pdsch->dmrs.dmrsConfigType = 0; /* type-1 */ pdsch->dmrs.dlDmrsScramblingId = cell->cellCfg.phyCellId; pdsch->dmrs.scid = 0; pdsch->dmrs.numDmrsCdmGrpsNoData = 1; pdsch->dmrs.dmrsPorts = 0; pdsch->dmrs.mappingType = DMRS_MAP_TYPE_A; /* Type-A */ pdsch->dmrs.nrOfDmrsSymbols = NUM_DMRS_SYMBOLS; pdsch->dmrs.dmrsAddPos = DMRS_ADDITIONAL_POS; pdsch->pdschTimeAlloc.rowIndex = k0Index; pdsch->pdschTimeAlloc.startSymb = initialBwp->pdschCommon.timeDomRsrcAllocList[k0Index].startSymbol; pdsch->pdschTimeAlloc.numSymb = initialBwp->pdschCommon.timeDomRsrcAllocList[k0Index].lengthSymbol; pdsch->pdschFreqAlloc.vrbPrbMapping = 0; /* non-interleaved */ pdsch->pdschFreqAlloc.resourceAllocType = 1; /* RAT type-1 RIV format */ pdsch->pdschFreqAlloc.startPrb = MAX_NUM_RB; pdsch->pdschFreqAlloc.numPrb = \ schCalcNumPrb(tbSize, mcs, initialBwp->pdschCommon.timeDomRsrcAllocList[k0Index].lengthSymbol); /* Find total symbols occupied including DMRS */ dmrsStartSymbol = findDmrsStartSymbol(pdsch->dmrs.dlDmrsSymbPos); /* If there are no DRMS symbols, findDmrsStartSymbol() returns MAX_SYMB_PER_SLOT, * in that case only PDSCH symbols are marked as occupied */ if(dmrsStartSymbol == MAX_SYMB_PER_SLOT) { startSymbol = pdsch->pdschTimeAlloc.startSymb; numSymbol = pdsch->pdschTimeAlloc.numSymb; } /* If DMRS symbol is found, mark DMRS and PDSCH symbols as occupied */ else { startSymbol = dmrsStartSymbol; numSymbol = pdsch->dmrs.nrOfDmrsSymbols + pdsch->pdschTimeAlloc.numSymb; } /* Allocate the number of PRBs required for RAR PDSCH */ if((allocatePrbDl(cell, rarTime, startSymbol, numSymbol,\ &pdsch->pdschFreqAlloc.startPrb, pdsch->pdschFreqAlloc.numPrb)) != ROK) { DU_LOG("\nERROR --> SCH : allocatePrbDl() failed for RAR"); SCH_FREE(rarAlloc->rarPdcchCfg, sizeof(PdcchCfg)); return RFAILED; } pdsch->beamPdschInfo.numPrgs = 1; pdsch->beamPdschInfo.prgSize = 1; pdsch->beamPdschInfo.digBfInterfaces = 0; pdsch->beamPdschInfo.prg[0].pmIdx = 0; pdsch->beamPdschInfo.prg[0].beamIdx[0] = 0; pdsch->txPdschPower.powerControlOffset = 0; pdsch->txPdschPower.powerControlOffsetSS = 0; return ROK; } /* @brief Process RACH resource release after CFRA * * @details * * Function : SchProcRachRsrcRel * * This function processes RACH resorce release * from MAC after CFRA. It releases the dedicated * preamble alloted to the UE * * @param[in] Post structure * @param[in] RACH resource release * @return ROK * RFAILED */ uint8_t SchProcRachRsrcRel(Pst *pst, SchRachRsrcRel *schRachRsrcRel) { uint8_t ret = ROK; uint8_t ssbIdx = 0, cfraSsbIdx = 0; uint16_t cellIdx = 0; Inst inst = pst->dstInst - SCH_INST_START; SchCellCb *cellCb = NULLP; SchUeCb *ueCb = NULLP; DU_LOG("\nINFO --> SCH : Received RACH resource release for Cell ID [%d] CRNTI [%d]", \ schRachRsrcRel->cellId, schRachRsrcRel->crnti); /* Fetch Cell CB */ for(cellIdx = 0; cellIdx < MAX_NUM_CELL; cellIdx++) { if((schCb[inst].cells[cellIdx]) && (schCb[inst].cells[cellIdx]->cellId == schRachRsrcRel->cellId)) { cellCb = schCb[inst].cells[cellIdx]; break; } } if(cellCb) { /* Fetch UE CB */ ueCb = schGetUeCb(cellCb, schRachRsrcRel->crnti); if(ueCb->crnti != schRachRsrcRel->crnti) { DU_LOG("\nERROR --> SCH : CRNTI [%d] not found", schRachRsrcRel->crnti); ret = RFAILED; } } else { DU_LOG("\nERROR --> SCH : Cell ID [%d] not found", schRachRsrcRel->cellId); ret = RFAILED; } /* Free SSB resource if no failure has occurred until this step */ if(ret == ROK) { for(ssbIdx = 0; ssbIdx < schRachRsrcRel->cfraResource.numSsb; ssbIdx++) { /* Search each ssbIdx entry in UE Cb */ for(cfraSsbIdx = 0; cfraSsbIdx < ueCb->cfraResource.numSsb; cfraSsbIdx++) { if(ueCb->cfraResource.ssbResource[cfraSsbIdx].ssbIdx == schRachRsrcRel->cfraResource.ssbResource[ssbIdx].ssbIdx) { /* If ssbIdx entry is found in UE CB, free dedicated resources * for this ssbIdx */ UNSET_ONE_BIT(ueCb->cfraResource.ssbResource[cfraSsbIdx].raPreambleIdx, cellCb->dedPreambleBitMap); memset(&ueCb->cfraResource.ssbResource[cfraSsbIdx], 0, sizeof(SchCfraSsbResource)); ueCb->cfraResource.numSsb--; break; } } } /* End of for */ } /* End of if */ /* Free RACH resource release memory allocated by MAC */ SCH_FREE(schRachRsrcRel, sizeof(SchRachRsrcRel)); return ret; } /* @brief process MSG4 completion * * @details * * Function : schMsg4Complete * * This function updates ra state and msg4 Hqrq * proc upon MSG4 completion * @param[in] SchUeCb *ueCb, UE cb pointer * @return VOID */ void schMsg4Complete(SchUeCb *ueCb) { DU_LOG("\nINFO --> SCH: State change for ueId[%2d] to SCH_RA_STATE_MSG4_DONE\n",ueCb->ueId); ueCb->cellCb->raCb[ueCb->ueId-1].raState = SCH_RA_STATE_MSG4_DONE; ueCb->msg4HqProc = ueCb->retxMsg4HqProc = NULLP; } /********************************************************************** End of file **********************************************************************/