154 lines
4.7 KiB
C
154 lines
4.7 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file nr_l1_helper.c
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* \brief PHY helper functions for PRACH adapted to NR
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* \author Guido Casati
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* \date 2019
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* \version 2.0
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* \email guido.casati@iis.fraunhofer.de
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* @ingroup _mac
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*/
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#include "PHY/defs_nr_common.h"
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#include "mac_defs.h"
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#include "LAYER2/NR_MAC_COMMON/nr_mac_extern.h"
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#include "LAYER2/NR_MAC_UE/mac_proto.h"
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/* TS 38.321 subclause 7.3 - return DELTA_PREAMBLE values in dB */
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int8_t nr_get_DELTA_PREAMBLE(module_id_t mod_id, int CC_id, uint16_t prach_format){
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NR_UE_MAC_INST_t *mac = get_mac_inst(mod_id);
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NR_ServingCellConfigCommon_t *scc = mac->scc;
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NR_RACH_ConfigCommon_t *nr_rach_ConfigCommon = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup;
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NR_SubcarrierSpacing_t scs = *nr_rach_ConfigCommon->msg1_SubcarrierSpacing;
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int prach_sequence_length = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup->prach_RootSequenceIndex.present - 1;
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uint8_t prachConfigIndex, mu;
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AssertFatal(CC_id == 0, "Transmission on secondary CCs is not supported yet\n");
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// SCS configuration from msg1_SubcarrierSpacing and table 4.2-1 in TS 38.211
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switch (scs){
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case NR_SubcarrierSpacing_kHz15:
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mu = 0;
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break;
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case NR_SubcarrierSpacing_kHz30:
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mu = 1;
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break;
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case NR_SubcarrierSpacing_kHz60:
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mu = 2;
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break;
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case NR_SubcarrierSpacing_kHz120:
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mu = 3;
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break;
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case NR_SubcarrierSpacing_kHz240:
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mu = 4;
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break;
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case NR_SubcarrierSpacing_spare3:
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mu = 5;
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break;
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case NR_SubcarrierSpacing_spare2:
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mu = 6;
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break;
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case NR_SubcarrierSpacing_spare1:
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mu = 7;
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break;
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default:
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AssertFatal(1 == 0,"Unknown msg1_SubcarrierSpacing %lu\n", scs);
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}
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// Preamble formats given by prach_ConfigurationIndex and tables 6.3.3.2-2 and 6.3.3.2-2 in TS 38.211
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prachConfigIndex = nr_rach_ConfigCommon->rach_ConfigGeneric.prach_ConfigurationIndex;
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if (prach_sequence_length == 0) {
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AssertFatal(prach_format < 4, "Illegal PRACH format %d for sequence length 839\n", prach_format);
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switch (prach_format) {
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// long preamble formats
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case 0:
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case 3:
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return 0;
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case 1:
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return -3;
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case 2:
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return -6;
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}
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} else {
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switch (prach_format) { // short preamble formats
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case 0:
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case 3:
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return 8 + 3*mu;
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case 1:
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case 4:
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case 8:
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return 5 + 3*mu;
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case 2:
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case 5:
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return 3 + 3*mu;
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case 6:
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return 3*mu;
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case 7:
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return 5 + 3*mu;
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default:
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AssertFatal(1 == 0, "[UE %d] ue_procedures.c: FATAL, Illegal preambleFormat %d, prachConfigIndex %d\n", mod_id, prach_format, prachConfigIndex);
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}
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}
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return 0;
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}
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/* TS 38.321 subclause 5.1.3 - RA preamble transmission - ra_PREAMBLE_RECEIVED_TARGET_POWER configuration */
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int nr_get_Po_NOMINAL_PUSCH(NR_PRACH_RESOURCES_t *prach_resources, module_id_t mod_id, uint8_t CC_id){
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NR_UE_MAC_INST_t *mac = get_mac_inst(mod_id);
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NR_ServingCellConfigCommon_t *scc = mac->scc;
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NR_RACH_ConfigCommon_t *nr_rach_ConfigCommon = scc->uplinkConfigCommon->initialUplinkBWP->rach_ConfigCommon->choice.setup;
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int8_t receivedTargerPower, delta_preamble;
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long preambleReceivedTargetPower;
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AssertFatal(nr_rach_ConfigCommon != NULL, "[UE %d] CCid %d FATAL nr_rach_ConfigCommon is NULL !!!\n", mod_id, CC_id);
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preambleReceivedTargetPower = nr_rach_ConfigCommon->rach_ConfigGeneric.preambleReceivedTargetPower;
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delta_preamble = nr_get_DELTA_PREAMBLE(mod_id, CC_id, prach_resources->prach_format);
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receivedTargerPower = preambleReceivedTargetPower + delta_preamble + (mac->RA_PREAMBLE_POWER_RAMPING_COUNTER - 1) * prach_resources->RA_PREAMBLE_POWER_RAMPING_STEP;
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return receivedTargerPower;
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}
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