106 lines
3.8 KiB
C
106 lines
3.8 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 PHY/NR_TRANSPORT/nr_ulsch.c
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* \brief Top-level routines for the reception of the PUSCH TS 38.211 v 15.4.0
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* \author Ahmed Hussein
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* \date 2019
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* \version 0.1
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* \company Fraunhofer IIS
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* \email: ahmed.hussein@iis.fraunhofer.de
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* \note
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* \warning
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*/
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#include <stdint.h>
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#include "PHY/NR_TRANSPORT/nr_transport_common_proto.h"
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#include "PHY/NR_TRANSPORT/nr_ulsch.h"
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#include "PHY/LTE_REFSIG/lte_refsig.h"
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int16_t find_nr_ulsch(uint16_t rnti, PHY_VARS_gNB *gNB,find_type_t type) {
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uint16_t i;
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int16_t first_free_index=-1;
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AssertFatal(gNB!=NULL,"gNB is null\n");
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for (i=0; i<NUMBER_OF_NR_ULSCH_MAX; i++) {
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AssertFatal(gNB->ulsch[i]!=NULL,"gNB->ulsch[%d] is null\n",i);
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AssertFatal(gNB->ulsch[i][0]!=NULL,"gNB->ulsch[%d][0] is null\n",i);
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LOG_D(PHY,"searching for rnti %x : ulsch_index %d=> harq_mask %x, rnti %x, first_free_index %d\n", rnti,i,gNB->ulsch[i][0]->harq_mask,gNB->ulsch[i][0]->rnti,first_free_index);
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if ((gNB->ulsch[i][0]->harq_mask >0) &&
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(gNB->ulsch[i][0]->rnti==rnti)) return i;
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else if ((gNB->ulsch[i][0]->harq_mask == 0) && (first_free_index==-1)) first_free_index=i;
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}
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if (type == SEARCH_EXIST) return -1;
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if (first_free_index != -1)
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gNB->ulsch[first_free_index][0]->rnti = 0;
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return first_free_index;
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}
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void nr_fill_ulsch(PHY_VARS_gNB *gNB,
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int frame,
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int slot,
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nfapi_nr_pusch_pdu_t *ulsch_pdu) {
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int ulsch_id = find_nr_ulsch(ulsch_pdu->rnti,gNB,SEARCH_EXIST_OR_FREE);
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AssertFatal( (ulsch_id>=0) && (ulsch_id<NUMBER_OF_NR_ULSCH_MAX),
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"illegal or no ulsch_id found!!! rnti %04x ulsch_id %d\n",ulsch_pdu->rnti,ulsch_id);
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NR_gNB_ULSCH_t *ulsch = gNB->ulsch[ulsch_id][0];
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int harq_pid = ulsch_pdu->pusch_data.harq_process_id;
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ulsch->rnti = ulsch_pdu->rnti;
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//ulsch->rnti_type;
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ulsch->harq_mask |= 1<<harq_pid;
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ulsch->harq_process_id[slot] = harq_pid;
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ulsch->harq_processes[harq_pid]->frame=frame;
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ulsch->harq_processes[harq_pid]->slot=slot;
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ulsch->harq_processes[harq_pid]->handled= 0;
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ulsch->harq_processes[harq_pid]->status= NR_ACTIVE;
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memcpy((void*)&ulsch->harq_processes[harq_pid]->ulsch_pdu, (void*)ulsch_pdu, sizeof(nfapi_nr_pusch_pdu_t));
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LOG_D(PHY,"Initializing nFAPI for ULSCH, UE %d, harq_pid %d\n",ulsch_id,harq_pid);
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}
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void nr_ulsch_unscrambling(int16_t* llr,
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uint32_t size,
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uint8_t q,
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uint32_t Nid,
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uint32_t n_RNTI) {
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uint8_t reset;
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uint32_t x1, x2, s=0;
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reset = 1;
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x2 = (n_RNTI<<15) + Nid;
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for (uint32_t i=0; i<size; i++) {
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if ((i&0x1f)==0) {
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s = lte_gold_generic(&x1, &x2, reset);
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reset = 0;
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}
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if (((s>>(i&0x1f))&1)==1)
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llr[i] = -llr[i];
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}
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}
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