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/*
* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The OpenAirInterface Software Alliance licenses this file to You under
* the OAI Public License, Version 1.1 (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.openairinterface.org/?page_id=698
*
* 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.
*-------------------------------------------------------------------------------
* For more information about the OpenAirInterface (OAI) Software Alliance:
* contact@openairinterface.org
*/
/*! \file PHY/NR_TRANSPORT/nr_ulsch.c
* \brief Top-level routines for the reception of the PUSCH TS 38.211 v 15.4.0
* \author Ahmed Hussein
* \date 2019
* \version 0.1
* \company Fraunhofer IIS
* \email: ahmed.hussein@iis.fraunhofer.de
* \note
* \warning
*/
#include <stdint.h>
#include "PHY/NR_TRANSPORT/nr_transport_common_proto.h"
#include "PHY/NR_TRANSPORT/nr_ulsch.h"
#include "PHY/LTE_REFSIG/lte_refsig.h"
int16_t find_nr_ulsch(uint16_t rnti, PHY_VARS_gNB *gNB,find_type_t type) {
uint16_t i;
int16_t first_free_index=-1;
AssertFatal(gNB!=NULL,"gNB is null\n");
for (i=0; i<NUMBER_OF_NR_ULSCH_MAX; i++) {
AssertFatal(gNB->ulsch[i]!=NULL,"gNB->ulsch[%d] is null\n",i);
AssertFatal(gNB->ulsch[i][0]!=NULL,"gNB->ulsch[%d][0] is null\n",i);
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);
if ((gNB->ulsch[i][0]->harq_mask >0) &&
(gNB->ulsch[i][0]->rnti==rnti)) return i;
else if ((gNB->ulsch[i][0]->harq_mask == 0) && (first_free_index==-1)) first_free_index=i;
}
if (type == SEARCH_EXIST) return -1;
if (first_free_index != -1)
gNB->ulsch[first_free_index][0]->rnti = 0;
return first_free_index;
}
void nr_fill_ulsch(PHY_VARS_gNB *gNB,
int frame,
int slot,
nfapi_nr_pusch_pdu_t *ulsch_pdu) {
int ulsch_id = find_nr_ulsch(ulsch_pdu->rnti,gNB,SEARCH_EXIST_OR_FREE);
AssertFatal( (ulsch_id>=0) && (ulsch_id<NUMBER_OF_NR_ULSCH_MAX),
"illegal or no ulsch_id found!!! rnti %04x ulsch_id %d\n",ulsch_pdu->rnti,ulsch_id);
NR_gNB_ULSCH_t *ulsch = gNB->ulsch[ulsch_id][0];
int harq_pid = ulsch_pdu->pusch_data.harq_process_id;
ulsch->rnti = ulsch_pdu->rnti;
//ulsch->rnti_type;
ulsch->harq_mask |= 1<<harq_pid;
ulsch->harq_process_id[slot] = harq_pid;
ulsch->harq_processes[harq_pid]->frame=frame;
ulsch->harq_processes[harq_pid]->slot=slot;
ulsch->harq_processes[harq_pid]->handled= 0;
ulsch->harq_processes[harq_pid]->status= NR_ACTIVE;
memcpy((void*)&ulsch->harq_processes[harq_pid]->ulsch_pdu, (void*)ulsch_pdu, sizeof(nfapi_nr_pusch_pdu_t));
LOG_D(PHY,"Initializing nFAPI for ULSCH, UE %d, harq_pid %d\n",ulsch_id,harq_pid);
}
void nr_ulsch_unscrambling(int16_t* llr,
uint32_t size,
uint8_t q,
uint32_t Nid,
uint32_t n_RNTI) {
uint8_t reset;
uint32_t x1, x2, s=0;
reset = 1;
x2 = (n_RNTI<<15) + Nid;
for (uint32_t i=0; i<size; i++) {
if ((i&0x1f)==0) {
s = lte_gold_generic(&x1, &x2, reset);
reset = 0;
}
if (((s>>(i&0x1f))&1)==1)
llr[i] = -llr[i];
}
}