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openairinterface5g/openair1/PHY/NR_TRANSPORT/nr_dci.c
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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_dci.c
* \brief Implements DCI encoding/decoding and PDCCH TX/RX procedures (38.212/38.213/38.214). V15.2.0 2018-06.
* \author Guy De Souza
* \date 2018
* \version 0.1
* \company Eurecom
* \email: desouza@eurecom.fr
* \note
* \warning
*/
#include "nr_dci.h"
#define DEBUG_PDCCH_DMRS
#define DEBUG_DCI
extern short nr_mod_table[NR_MOD_TABLE_SIZE_SHORT];
uint8_t nr_get_dci_size(nfapi_nr_dci_format_e format,
nfapi_nr_rnti_type_e rnti_type,
NR_BWP_PARMS* bwp,
nfapi_nr_config_request_t* config)
{
uint8_t size = 0;
uint16_t N_RB = bwp->N_RB;
switch(format) {
/*Only sizes for 0_0 and 1_0 are correct at the moment*/
case NFAPI_NR_UL_DCI_FORMAT_0_0:
/// fixed: Format identifier 1, Hop flag 1, MCS 5, NDI 1, RV 2, HARQ PID 4, PUSCH TPC 2 Time Domain assgnmt 4 --20
size += 20;
size += (uint8_t)ceil( log2( (N_RB*(N_RB+1))>>1 ) ); // Freq domain assignment -- hopping scenario to be updated
// UL/SUL indicator assumed to be 0
// Padding
break;
case NFAPI_NR_UL_DCI_FORMAT_0_1:
/// fixed: Format identifier 1, MCS 5, NDI 1, RV 2, HARQ PID 4, PUSCH TPC 2, SRS request 2 --17
size += 17;
// Carrier indicator
// UL/SUL indicator
// BWP Indicator
// Freq domain assignment
// Time domain assignment
// VRB to PRB mapping
// Frequency Hopping flag
// 1st DAI
// 2nd DAI
// SRS resource indicator
// Precoding info and number of layers
// Antenna ports
// CSI request
// CBGTI
// PTRS - DMRS association
// beta offset indicator
// DMRS sequence init
break;
case NFAPI_NR_DL_DCI_FORMAT_1_0:
/// fixed: Format identifier 1, VRB2PRB 1, MCS 5, NDI 1, RV 2, HARQ PID 4, DAI 2, PUCCH TPC 2, PUCCH RInd 3, PDSCH to HARQ TInd 3 --24
size += 24;
size += (uint8_t)ceil( log2( (N_RB*(N_RB+1))>>1 ) ); // Freq domain assignment
// Time domain assignment
break;
case NFAPI_NR_DL_DCI_FORMAT_1_1:
// Carrier indicator
size += 1; // Format identifier
// BWP Indicator
// Freq domain assignment
// Time domain assignment
// VRB to PRB mapping
// PRB bundling size indicator
// Rate matching indicator
// ZP CSI-RS trigger
/// TB1- MCS 5, NDI 1, RV 2
size += 8;
// TB2
size += 4 ; // HARQ PID
// DAI
size += 2; // TPC PUCCH
size += 3; // PUCCH resource indicator
size += 3; // PDSCH to HARQ timing indicator
// Antenna ports
// Tx Config Indication
size += 2; // SRS request
// CBGTI
// CBGFI
size += 1; // DMRS sequence init
break;
case NFAPI_NR_DL_DCI_FORMAT_2_0:
break;
case NFAPI_NR_DL_DCI_FORMAT_2_1:
break;
case NFAPI_NR_DL_DCI_FORMAT_2_2:
break;
case NFAPI_NR_DL_DCI_FORMAT_2_3:
break;
default:
AssertFatal(1==0, "Invalid NR DCI format %d\n", format);
}
return size;
}
void nr_pdcch_scrambling(uint32_t *in,
uint8_t size,
uint32_t Nid,
uint32_t n_RNTI,
uint32_t* out) {
uint8_t reset;
uint32_t x1, x2, s=0;
reset = 1;
x2 = (n_RNTI<<16) + Nid;
for (int i=0; i<size; i++) {
if ((i&0x1f)==0) {
s = lte_gold_generic(&x1, &x2, reset);
reset = 0;
}
*out ^= (((*in)>>i)&1) ^ ((s>>i)&1);
}
}
uint8_t nr_generate_dci_top(NR_gNB_PDCCH pdcch_vars,
uint32_t *gold_pdcch_dmrs,
int32_t** txdataF,
int16_t amp,
NR_DL_FRAME_PARMS frame_parms,
nfapi_nr_config_request_t config)
{
uint16_t mod_dmrs[NR_MAX_PDCCH_DMRS_LENGTH<<1];
uint8_t idx=0;
uint16_t a;
int k,l,k_prime,dci_idx, dmrs_idx;
nr_cce_t cce;
/*First iteration: single DCI*/
NR_gNB_DCI_ALLOC_t dci_alloc = pdcch_vars.dci_alloc[0];
nfapi_nr_dl_config_pdcch_parameters_rel15_t pdcch_params = dci_alloc.pdcch_params;
/// DMRS QPSK modulation
/*There is a need to shift from which index the pregenerated DMRS sequence is used
* see 38211 r15.2.0 section 7.4.1.3.2: assumption is the reference point for k refers to the DMRS sequence*/
if (pdcch_params.config_type == nr_cset_config_pdcch_config)
gold_pdcch_dmrs += ((int)floor(frame_parms.ssb_start_subcarrier/NR_NB_SC_PER_RB)+pdcch_params.rb_offset)*3/32;
for (int i=0; i<NR_MAX_PDCCH_DMRS_LENGTH>>1; i++) {
idx = ((((gold_pdcch_dmrs[(i<<1)>>5])>>((i<<1)&0x1f))&1)<<1) ^ (((gold_pdcch_dmrs[((i<<1)+1)>>5])>>(((i<<1)+1)&0x1f))&1);
mod_dmrs[i<<1] = nr_mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
mod_dmrs[(i<<1)+1] = nr_mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1) + 1];
#ifdef DEBUG_PDCCH_DMRS
printf("i %d idx %d gold seq %d b0-b1 %d-%d mod_dmrs %d %d\n", i, idx, gold_pdcch_dmrs[(i<<1)>>5], (((gold_pdcch_dmrs[(i<<1)>>5])>>((i<<1)&0x1f))&1),
(((gold_pdcch_dmrs[((i<<1)+1)>>5])>>(((i<<1)+1)&0x1f))&1), mod_dmrs[(i<<1)], mod_dmrs[(i<<1)+1]);
#endif
}
/// DCI payload processing
//channel coding
// scrambling
uint32_t scrambled_payload[4];
uint32_t Nid = (dci_alloc.search_space_type == NFAPI_NR_SEARCH_SPACE_TYPE_UE_SPECIFIC)? pdcch_params.scrambling_id : config.sch_config.physical_cell_id.value;
uint32_t n_RNTI = (dci_alloc.search_space_type == NFAPI_NR_SEARCH_SPACE_TYPE_UE_SPECIFIC)? dci_alloc.rnti : 0;
nr_pdcch_scrambling(dci_alloc.dci_pdu, dci_alloc.size, Nid, n_RNTI, scrambled_payload);
// QPSK modulation
uint32_t mod_dci[NR_MAX_DCI_SIZE>>1];
for (int i=0; i<dci_alloc.size>>1; i++) {
idx = (((scrambled_payload[i<<1]>>(i<<1))&1)<<1) ^ ((scrambled_payload[(i<<1)+1]>>((i<<1)+1))&1);
mod_dci[i<<1] = nr_mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
mod_dci[(i<<1)+1] = nr_mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1) + 1];
}
/// Resource mapping
a = (config.rf_config.tx_antenna_ports.value == 1) ? amp : (amp*ONE_OVER_SQRT2_Q15)>>15;
/*The coreset is initialised
* in frequency: the first subcarrier is obtained by adding the first CRB overlapping the SSB and the rb_offset
* in time: by its first slot and its first symbol*/
uint8_t cset_start_sc = frame_parms.first_carrier_offset + ((int)floor(frame_parms.ssb_start_subcarrier/NR_NB_SC_PER_RB)+pdcch_params.rb_offset)*NR_NB_SC_PER_RB;
uint8_t cset_start_symb = pdcch_params.first_slot*frame_parms.symbols_per_slot + pdcch_params.first_symbol;
dci_idx = 0;
dmrs_idx = 0;
for (int aa = 0; aa < config.rf_config.tx_antenna_ports.value; aa++)
{
if (cset_start_sc >= frame_parms.ofdm_symbol_size)
cset_start_sc -= frame_parms.ofdm_symbol_size;
if (pdcch_params.precoder_granularity == nr_cset_same_as_reg_bundle) {
for (int cce_idx=0; cce_idx<dci_alloc.L; cce_idx++){
cce = dci_alloc.cce_list[cce_idx];
for (int reg_idx=0; reg_idx<NR_NB_REG_PER_CCE; reg_idx++) {
k = cset_start_sc + cce.reg_list[reg_idx].start_sc_idx;
l = cset_start_symb + cce.reg_list[reg_idx].symb_idx;
k_prime = 0;
for (int m=0; m<NR_NB_SC_PER_RB; m++) {
if ( m == (k_prime<<2)+1) { // DMRS
((int16_t*)txdataF[aa])[(l*frame_parms.ofdm_symbol_size + k)<<1] = (a * mod_dmrs[dmrs_idx<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms.ofdm_symbol_size + k)<<1) + 1] = (a * mod_dmrs[(dmrs_idx<<1) + 1]) >> 15;
k_prime++;
dmrs_idx++;
}
else { // DCI payload
((int16_t*)txdataF[aa])[(l*frame_parms.ofdm_symbol_size + k)<<1] = (a * mod_dci[dci_idx<<1]) >> 15;
((int16_t*)txdataF[aa])[((l*frame_parms.ofdm_symbol_size + k)<<1) + 1] = (a * mod_dci[(dci_idx<<1) + 1]) >> 15;
dci_idx++;
}
k++;
if (k >= frame_parms.ofdm_symbol_size)
k -= frame_parms.ofdm_symbol_size;
}
}
}
}
else { //nr_cset_all_contiguous_rbs
}
}
return 0;
}
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