1 /*******************************************************************************
2 ################################################################################
3 # Copyright (c) [2017-2019] [Radisys] #
5 # Licensed under the Apache License, Version 2.0 (the "License"); #
6 # you may not use this file except in compliance with the License. #
7 # You may obtain a copy of the License at #
9 # http://www.apache.org/licenses/LICENSE-2.0 #
11 # Unless required by applicable law or agreed to in writing, software #
12 # distributed under the License is distributed on an "AS IS" BASIS, #
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. #
14 # See the License for the specific language governing permissions and #
15 # limitations under the License. #
16 ################################################################################
17 *******************************************************************************/
19 /************************************************************************
25 Desc: C source code for rach handling functions
29 **********************************************************************/
32 @brief This file implements the rach handling.
34 #include "common_def.h"
40 #include "du_app_mac_inf.h"
41 #include "mac_sch_interface.h"
43 #include "sch_utils.h"
45 SchCb schCb[SCH_MAX_INST];
46 uint8_t puschDeltaTable[MAX_MU_PUSCH];
49 * @brief calculate ra-rnti function.
53 * Function : calculateRaRnti
55 * This function calculates ra-rnti
57 * @param[in] symbol index
58 * @param[in] slot index
59 * @param[in] frequency index
62 uint16_t calculateRaRnti(uint8_t symbolIdx, uint8_t slotIdx, uint8_t freqIdx)
65 uint8_t ulCarrierIdx = 0; /* configured to 0 */
67 raRnti = (1+symbolIdx+(14*slotIdx)+(14*80*freqIdx)+(14*80*8*ulCarrierIdx));
73 * @brief create raCb function.
77 * Function : createSchRaCb
79 * This function create raCb
82 * @param[in] shed instance
85 void createSchRaCb(uint16_t tcrnti, Inst schInst)
89 GET_UE_IDX(tcrnti, ueIdx);
90 schCb[schInst].cells[schInst]->raCb[ueIdx -1].tcrnti = tcrnti;
94 * @brief resource allocation for msg3 PUSCH
98 * Function : schAllocMsg3Pusch
100 * This function handles msg3 PUSCH allocation
102 * @param[in] Inst schInst, SCH instance
103 * @param[in] slot, current slot
104 * @param[out] msg3StartRb
105 * @param[out] msg3NumRb
108 uint8_t schAllocMsg3Pusch(Inst schInst, uint16_t slot, uint16_t crnti, \
109 uint16_t *msg3StartRb, uint8_t *msg3NumRb)
111 SchCellCb *cell = NULLP;
112 SchUlSlotInfo *schUlSlotInfo = NULLP;
114 uint8_t msg3SlotAlloc = 0;
117 uint8_t startSymb = 0;
123 uint8_t numPdschSymbols= 14;
126 cell = schCb[schInst].cells[schInst];
127 // puschMu = cell->cellCfg.puschMu;
128 delta = puschDeltaTable[puschMu];
129 k2 = cell->cellCfg.schInitialUlBwp.puschCommon.k2;
130 startSymb = cell->cellCfg.schInitialUlBwp.puschCommon.startSymbol;
131 symbLen = cell->cellCfg.schInitialUlBwp.puschCommon.lengthSymbol;
133 /* Slot allocation for msg3 based on 38.214 section 6.1.2.1 */
134 msg3SlotAlloc = slot + k2 + delta;
135 msg3SlotAlloc = msg3SlotAlloc % SCH_NUM_SLOTS;
137 startRb = cell->schUlSlotInfo[msg3SlotAlloc]->puschCurrentPrb;
138 tbSize = schCalcTbSize(8); /* 6 bytes msg3 and 2 bytes header */
139 numRb = schCalcNumPrb(tbSize, mcs, numPdschSymbols);
141 /* allocating 1 extra RB for now */
143 /* increment PUSCH PRB */
144 cell->schUlSlotInfo[msg3SlotAlloc]->puschCurrentPrb += numRb;
146 for(idx=startSymb; idx<symbLen; idx++)
148 cell->schUlSlotInfo[msg3SlotAlloc]->assignedPrb[idx] = startRb + numRb;
150 schUlSlotInfo = cell->schUlSlotInfo[msg3SlotAlloc];
152 SCH_ALLOC(schUlSlotInfo->schPuschInfo, sizeof(SchPuschInfo));
153 if(!schUlSlotInfo->schPuschInfo)
155 DU_LOG("SCH: Memory allocation failed in schAllocMsg3Pusch");
158 tbSize = 0; /* since nPrb has been incremented, recalculating tbSize */
159 tbSize = schCalcTbSizeFromNPrb(numRb, mcs, numPdschSymbols);
161 schUlSlotInfo->schPuschInfo->crnti = crnti;
162 schUlSlotInfo->schPuschInfo->harqProcId = SCH_HARQ_PROC_ID;
163 schUlSlotInfo->schPuschInfo->resAllocType = SCH_ALLOC_TYPE_1;
164 schUlSlotInfo->schPuschInfo->fdAlloc.startPrb = startRb;
165 schUlSlotInfo->schPuschInfo->fdAlloc.numPrb = numRb;
166 schUlSlotInfo->schPuschInfo->tdAlloc.startSymb = startSymb;
167 schUlSlotInfo->schPuschInfo->tdAlloc.numSymb = symbLen;
168 schUlSlotInfo->schPuschInfo->tbInfo.qamOrder = 2; /* QPSK modulation */
169 schUlSlotInfo->schPuschInfo->tbInfo.mcs = mcs;
170 schUlSlotInfo->schPuschInfo->tbInfo.mcsTable = SCH_MCS_TABLE_QAM_64;
171 schUlSlotInfo->schPuschInfo->tbInfo.ndi = 1; /* new transmission */
172 schUlSlotInfo->schPuschInfo->tbInfo.rv = 0;
173 schUlSlotInfo->schPuschInfo->tbInfo.tbSize = tbSize; /*Considering 2 PRBs */
174 schUlSlotInfo->schPuschInfo->dmrsMappingType = DMRS_MAP_TYPE_A; /* Setting Type-A */
175 schUlSlotInfo->schPuschInfo->nrOfDmrsSymbols = NUM_DMRS_SYMBOLS;
176 schUlSlotInfo->schPuschInfo->dmrsAddPos = DMRS_ADDITIONAL_POS;
178 *msg3StartRb = startRb;
186 * @brief process rach indication function.
190 * Function : schProcessRachInd
192 * This function process rach indication
194 * @param[in] rachInd parameters
195 * @param[in] shed instance
198 uint8_t schProcessRachInd(RachIndInfo *rachInd, Inst schInst)
200 SchCellCb *cell = schCb[schInst].cells[schInst];
201 RarInfo *rarInfo = NULLP;
203 uint16_t rarSlot = 0;
204 uint16_t msg3StartRb;
208 /* RAR will sent with a delay of RAR_DELAY */
209 rarSlot = (rachInd->timingInfo.slot+RAR_DELAY+PHY_DELTA)%SCH_NUM_SLOTS;
211 SchDlSlotInfo *schDlSlotInfo = cell->schDlSlotInfo[rarSlot]; /* RAR will sent in the next slot */
213 /* Allocate the rarInfo, this pointer will be checked at schProcessSlotInd function */
214 SCH_ALLOC(rarInfo, sizeof(RarInfo));
217 DU_LOG("\nMAC: Memory Allocation failed for rarInfo");
221 schDlSlotInfo->rarInfo = rarInfo;
223 /* calculate the ra-rnti value */
224 raRnti = calculateRaRnti(rachInd->symbolIdx,rachInd->slotIdx,rachInd->freqIdx);
226 /* create raCb at SCH */
227 createSchRaCb(rachInd->crnti,schInst);
229 /* allocate resources for msg3 */
230 ret = schAllocMsg3Pusch(schInst, rarSlot, rachInd->crnti, &msg3StartRb, &msg3NumRb);
234 rarInfo->raRnti = raRnti;
235 rarInfo->tcrnti = rachInd->crnti;
236 rarInfo->RAPID = rachInd->preambleIdx;
237 rarInfo->ta = rachInd->timingAdv;
238 rarInfo->msg3FreqAlloc.startPrb = msg3StartRb;
239 rarInfo->msg3FreqAlloc.numPrb = msg3NumRb;
245 * @brief fill RAR info function.
249 * Function : calculateRaRnti
251 * This function fills pdcch and pdsch info for RAR
253 * @param[in] rar Allocation info
256 * @param[in] offset to pointA to determine freq alloc
259 uint8_t schFillRar(RarAlloc *rarAlloc, uint16_t raRnti, uint16_t pci, uint8_t offsetPointA)
262 uint8_t coreset0Idx = 0;
264 uint8_t firstSymbol = 0;
265 uint8_t numSymbols = 0;
267 uint8_t FreqDomainResource[6] = {0};
269 uint8_t numPdschSymbols = 12; /* considering pdsch region from 2 to 13 */
270 uint8_t mcs = 4; /* MCS fixed to 4 */
272 SchBwpDlCfg *initialBwp = &schCb[inst].cells[inst]->cellCfg.schInitialDlBwp;
274 PdcchCfg *pdcch = &rarAlloc->rarPdcchCfg;
275 PdschCfg *pdsch = &rarAlloc->rarPdschCfg;
276 BwpCfg *bwp = &rarAlloc->bwp;
278 coreset0Idx = initialBwp->pdcchCommon.commonSearchSpace.coresetId;
280 /* derive the sib1 coreset0 params from table 13-1 spec 38.213 */
281 numRbs = coresetIdxTable[coreset0Idx][1];
282 numSymbols = coresetIdxTable[coreset0Idx][2];
283 offset = coresetIdxTable[coreset0Idx][3];
285 /* calculate time domain parameters */
286 // note: since slot value is made sl1, RAR can be sent at all slots
287 uint16_t mask = 0x2000;
288 for(firstSymbol=0; firstSymbol<14;firstSymbol++)
290 if(initialBwp->pdcchCommon.commonSearchSpace.monitoringSymbol & mask)
296 /* calculate the PRBs */
297 freqDomRscAllocType0(((offsetPointA-offset)/6), (numRbs/6), FreqDomainResource);
300 bwp->freqAlloc.numPrb = initialBwp->bwp.freqAlloc.numPrb;
301 bwp->freqAlloc.startPrb = initialBwp->bwp.freqAlloc.startPrb;
302 bwp->subcarrierSpacing = initialBwp->bwp.scs;
303 bwp->cyclicPrefix = initialBwp->bwp.cyclicPrefix;
305 /* fill the PDCCH PDU */
306 pdcch->coresetCfg.startSymbolIndex = firstSymbol;
307 pdcch->coresetCfg.durationSymbols = numSymbols;
308 memcpy(pdcch->coresetCfg.freqDomainResource, FreqDomainResource, FREQ_DOM_RSRC_SIZE);
309 pdcch->coresetCfg.cceRegMappingType = 1; /* coreset0 is always interleaved */
310 pdcch->coresetCfg.regBundleSize = 6; /* spec-38.211 sec 7.3.2.2 */
311 pdcch->coresetCfg.interleaverSize = 2; /* spec-38.211 sec 7.3.2.2 */
312 pdcch->coresetCfg.coreSetType = 0;
313 pdcch->coresetCfg.shiftIndex = pci;
314 pdcch->coresetCfg.precoderGranularity = 0; /* sameAsRegBundle */
316 pdcch->dci.rnti = raRnti; /* RA-RNTI */
317 pdcch->dci.scramblingId = pci;
318 pdcch->dci.scramblingRnti = 0;
319 pdcch->dci.cceIndex = 4; /* considering SIB1 is sent at cce 0-1-2-3 */
320 pdcch->dci.aggregLevel = 4;
321 pdcch->dci.beamPdcchInfo.numPrgs = 1;
322 pdcch->dci.beamPdcchInfo.prgSize = 1;
323 pdcch->dci.beamPdcchInfo.digBfInterfaces = 0;
324 pdcch->dci.beamPdcchInfo.prg[0].pmIdx = 0;
325 pdcch->dci.beamPdcchInfo.prg[0].beamIdx[0] = 0;
326 pdcch->dci.txPdcchPower.powerValue = 0;
327 pdcch->dci.txPdcchPower.powerControlOffsetSS = 0;
328 pdcch->dci.pdschCfg = pdsch;
330 /* fill the PDSCH PDU */
332 pdsch->pduBitmap = 0; /* PTRS and CBG params are excluded */
333 pdsch->rnti = raRnti; /* RA-RNTI */
335 pdsch->numCodewords = 1;
336 for(cwCount = 0; cwCount < pdsch->numCodewords; cwCount++)
338 pdsch->codeword[cwCount].targetCodeRate = 308;
339 pdsch->codeword[cwCount].qamModOrder = 2;
340 pdsch->codeword[cwCount].mcsIndex = mcs; /* mcs configured to 4 */
341 pdsch->codeword[cwCount].mcsTable = 0; /* notqam256 */
342 pdsch->codeword[cwCount].rvIndex = 0;
343 tbSize = schCalcTbSize(10); /* 8 bytes RAR and 2 bytes padding */
344 pdsch->codeword[cwCount].tbSize = tbSize;
346 pdsch->dataScramblingId = pci;
347 pdsch->numLayers = 1;
348 pdsch->transmissionScheme = 0;
350 pdsch->dmrs.dlDmrsSymbPos = 2;
351 pdsch->dmrs.dmrsConfigType = 0; /* type-1 */
352 pdsch->dmrs.dlDmrsScramblingId = pci;
353 pdsch->dmrs.scid = 0;
354 pdsch->dmrs.numDmrsCdmGrpsNoData = 1;
355 pdsch->dmrs.dmrsPorts = 0;
356 pdsch->dmrs.mappingType = DMRS_MAP_TYPE_A; /* Type-A */
357 pdsch->dmrs.nrOfDmrsSymbols = NUM_DMRS_SYMBOLS;
358 pdsch->dmrs.dmrsAddPos = DMRS_ADDITIONAL_POS;
359 pdsch->pdschFreqAlloc.resourceAllocType = 1; /* RAT type-1 RIV format */
360 pdsch->pdschFreqAlloc.freqAlloc.startPrb = offset + SCH_SSB_NUM_PRB; /* the RB numbering starts from coreset0, and PDSCH is always above SSB */
361 pdsch->pdschFreqAlloc.freqAlloc.numPrb = schCalcNumPrb(tbSize,mcs,numPdschSymbols);
362 pdsch->pdschFreqAlloc.vrbPrbMapping = 0; /* non-interleaved */
363 pdsch->pdschTimeAlloc.timeAlloc.startSymb = initialBwp->pdschCommon.startSymbol;
364 pdsch->pdschTimeAlloc.timeAlloc.numSymb = initialBwp->pdschCommon.lengthSymbol;
365 pdsch->beamPdschInfo.numPrgs = 1;
366 pdsch->beamPdschInfo.prgSize = 1;
367 pdsch->beamPdschInfo.digBfInterfaces = 0;
368 pdsch->beamPdschInfo.prg[0].pmIdx = 0;
369 pdsch->beamPdschInfo.prg[0].beamIdx[0] = 0;
370 pdsch->txPdschPower.powerControlOffset = 0;
371 pdsch->txPdschPower.powerControlOffsetSS = 0;
376 /**********************************************************************
378 **********************************************************************/