291 lines
11 KiB
C
291 lines
11 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_dci.c
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* \brief Implements DCI encoding/decoding and PDCCH TX/RX procedures (38.212/38.213/38.214). V15.2.0 2018-06.
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* \author Guy De Souza
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* \date 2018
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* \version 0.1
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* \company Eurecom
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* \email: desouza@eurecom.fr
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* \note
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* \warning
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*/
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#include "nr_dci.h"
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//#define DEBUG_PDCCH_DMRS
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//#define DEBUG_DCI
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#define DEBUG_POLAR_PARAMS
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extern short nr_mod_table[NR_MOD_TABLE_SIZE_SHORT];
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uint16_t nr_get_dci_size(nfapi_nr_dci_format_e format,
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nfapi_nr_rnti_type_e rnti_type,
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NR_BWP_PARMS* bwp,
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nfapi_nr_config_request_t* config)
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{
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uint16_t size = 0;
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uint16_t N_RB = bwp->N_RB;
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switch(format) {
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/*Only sizes for 0_0 and 1_0 are correct at the moment*/
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case NFAPI_NR_UL_DCI_FORMAT_0_0:
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/// fixed: Format identifier 1, Hop flag 1, MCS 5, NDI 1, RV 2, HARQ PID 4, PUSCH TPC 2 Time Domain assgnmt 4 --20
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size += 20;
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size += (uint8_t)ceil( log2( (N_RB*(N_RB+1))>>1 ) ); // Freq domain assignment -- hopping scenario to be updated
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size += nr_get_dci_size(NFAPI_NR_DL_DCI_FORMAT_1_0, rnti_type, bwp, config) - size; // Padding to match 1_0 size
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// UL/SUL indicator assumed to be 0
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break;
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case NFAPI_NR_UL_DCI_FORMAT_0_1:
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/// fixed: Format identifier 1, MCS 5, NDI 1, RV 2, HARQ PID 4, PUSCH TPC 2, SRS request 2 --17
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size += 17;
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// Carrier indicator
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// UL/SUL indicator
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// BWP Indicator
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// Freq domain assignment
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// Time domain assignment
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// VRB to PRB mapping
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// Frequency Hopping flag
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// 1st DAI
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// 2nd DAI
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// SRS resource indicator
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// Precoding info and number of layers
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// Antenna ports
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// CSI request
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// CBGTI
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// PTRS - DMRS association
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// beta offset indicator
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// DMRS sequence init
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break;
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case NFAPI_NR_DL_DCI_FORMAT_1_0:
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/// 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 Time Domain assgnmt 4 -- 28
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size += 28;
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size += (uint8_t)ceil( log2( (N_RB*(N_RB+1))>>1 ) ); // Freq domain assignment
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break;
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case NFAPI_NR_DL_DCI_FORMAT_1_1:
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// Carrier indicator
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size += 1; // Format identifier
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// BWP Indicator
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// Freq domain assignment
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// Time domain assignment
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// VRB to PRB mapping
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// PRB bundling size indicator
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// Rate matching indicator
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// ZP CSI-RS trigger
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/// TB1- MCS 5, NDI 1, RV 2
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size += 8;
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// TB2
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size += 4 ; // HARQ PID
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// DAI
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size += 2; // TPC PUCCH
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size += 3; // PUCCH resource indicator
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size += 3; // PDSCH to HARQ timing indicator
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// Antenna ports
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// Tx Config Indication
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size += 2; // SRS request
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// CBGTI
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// CBGFI
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size += 1; // DMRS sequence init
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break;
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case NFAPI_NR_DL_DCI_FORMAT_2_0:
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break;
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case NFAPI_NR_DL_DCI_FORMAT_2_1:
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break;
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case NFAPI_NR_DL_DCI_FORMAT_2_2:
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break;
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case NFAPI_NR_DL_DCI_FORMAT_2_3:
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break;
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default:
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AssertFatal(1==0, "Invalid NR DCI format %d\n", format);
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}
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return size;
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}
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void nr_pdcch_scrambling(uint32_t *in,
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uint8_t size,
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uint32_t Nid,
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uint32_t n_RNTI,
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uint32_t* out) {
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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<<16) + Nid;
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for (int 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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*out ^= (((*in)>>i)&1) ^ ((s>>i)&1);
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}
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}
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uint8_t nr_generate_dci_top(NR_gNB_PDCCH pdcch_vars,
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t_nrPolar_paramsPtr *nrPolar_params,
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uint32_t **gold_pdcch_dmrs,
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int32_t** txdataF,
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int16_t amp,
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NR_DL_FRAME_PARMS frame_parms,
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nfapi_nr_config_request_t config)
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{
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int16_t mod_dmrs[3][NR_MAX_PDCCH_DMRS_LENGTH>>1]; // 3 for the max coreset duration
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uint8_t idx=0;
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uint16_t a;
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int k,l,k_prime,dci_idx, dmrs_idx;
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nr_cce_t cce;
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/*First iteration: single DCI*/
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NR_gNB_DCI_ALLOC_t dci_alloc = pdcch_vars.dci_alloc[0];
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nfapi_nr_dl_config_pdcch_parameters_rel15_t pdcch_params = dci_alloc.pdcch_params;
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uint16_t dmrs_length = dci_alloc.L*36; //2(QPSK)*3(per RB)*6(REG per CCE)
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uint16_t encoded_length = dci_alloc.L*108; //2(QPSK)*9(per RB)*6(REG per CCE)
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/*The coreset is initialised
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* in frequency: the first subcarrier is obtained by adding the first CRB overlapping the SSB and the rb_offset
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* in time: by its first slot and its first symbol*/
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uint16_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;
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uint8_t cset_start_symb = pdcch_params.first_slot*frame_parms.symbols_per_slot + pdcch_params.first_symbol;
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dci_idx = 0;
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dmrs_idx = 0;
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/// DMRS QPSK modulation
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/*There is a need to shift from which index the pregenerated DMRS sequence is used
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* see 38211 r15.2.0 section 7.4.1.3.2: assumption is the reference point for k refers to the DMRS sequence*/
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if (pdcch_params.config_type == NFAPI_NR_CSET_CONFIG_PDCCH_CONFIG)
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gold_pdcch_dmrs += ((int)floor(frame_parms.ssb_start_subcarrier/NR_NB_SC_PER_RB)+pdcch_params.rb_offset)*3/32;
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for (int symb=cset_start_symb; symb<cset_start_symb + pdcch_params.n_symb; symb++) {
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for (int i=0; i<dmrs_length>>1; i++) {
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idx = ((((gold_pdcch_dmrs[symb][(i<<1)>>5])>>((i<<1)&0x1f))&1)<<1) ^ (((gold_pdcch_dmrs[symb][((i<<1)+1)>>5])>>(((i<<1)+1)&0x1f))&1);
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mod_dmrs[symb][i<<1] = nr_mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
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mod_dmrs[symb][(i<<1)+1] = nr_mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1) + 1];
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#ifdef DEBUG_PDCCH_DMRS
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printf("symb %d i %d idx %d gold seq %u b0-b1 %d-%d mod_dmrs %d %d\n", symb, i, idx, gold_pdcch_dmrs[symb][(i<<1)>>5],
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(((gold_pdcch_dmrs[symb][(i<<1)>>5])>>((i<<1)&0x1f))&1), (((gold_pdcch_dmrs[symb][((i<<1)+1)>>5])>>(((i<<1)+1)&0x1f))&1),
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mod_dmrs[symb][(i<<1)], mod_dmrs[symb][(i<<1)+1]);
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#endif
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}
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}
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/// DCI payload processing
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//channel coding
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nr_polar_init(nrPolar_params, NR_POLAR_DCI_MESSAGE_TYPE, dci_alloc.size, dci_alloc.L);
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t_nrPolar_paramsPtr currentPtr = nr_polar_params(*nrPolar_params, NR_POLAR_DCI_MESSAGE_TYPE, dci_alloc.size);
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uint8_t *encoderInput = malloc(sizeof(uint8_t) * dci_alloc.size);
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uint8_t *encoderOutput = malloc(sizeof(uint8_t) * currentPtr->encoderLength);
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uint32_t encoded_payload[4];
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nr_bit2byte_uint32_8_t(dci_alloc.dci_pdu,dci_alloc.size,encoderInput);
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polar_encoder(encoderInput, encoderOutput, currentPtr);
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nr_byte2bit_uint8_32_t(encoderOutput, currentPtr->encoderLength, encoded_payload);
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#ifdef DEBUG_POLAR_PARAMS
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printf("DCI PDU: [0]->0x%08x \t [1]->0x%08x \t [2]->0x%08x \t [3]->0x%08x\n",
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dci_alloc.dci_pdu[0], dci_alloc.dci_pdu[1], dci_alloc.dci_pdu[2], dci_alloc.dci_pdu[3]);
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printf("Encoded Payload: [0]->0x%08x \t [1]->0x%08x \t [2]->0x%08x \t [3]->0x%08x\n",
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encoded_payload[0], encoded_payload[1], encoded_payload[2], encoded_payload[3]);
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#endif
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// scrambling
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uint32_t scrambled_payload[NR_MAX_DCI_SIZE_DWORD];
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uint32_t Nid = (pdcch_params.search_space_type == NFAPI_NR_SEARCH_SPACE_TYPE_UE_SPECIFIC)? pdcch_params.scrambling_id : config.sch_config.physical_cell_id.value;
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uint32_t n_RNTI = (pdcch_params.search_space_type == NFAPI_NR_SEARCH_SPACE_TYPE_UE_SPECIFIC)? pdcch_params.rnti : 0;
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nr_pdcch_scrambling(encoded_payload, dci_alloc.size, Nid, n_RNTI, scrambled_payload);
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// QPSK modulation
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int16_t mod_dci[NR_MAX_DCI_SIZE>>1];
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for (int i=0; i<encoded_length>>1; i++) {
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idx = (((scrambled_payload[i<<1]>>(i<<1))&1)<<1) ^ ((scrambled_payload[(i<<1)+1]>>((i<<1)+1))&1);
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mod_dci[i<<1] = nr_mod_table[(NR_MOD_TABLE_QPSK_OFFSET + idx)<<1];
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mod_dci[(i<<1)+1] = nr_mod_table[((NR_MOD_TABLE_QPSK_OFFSET + idx)<<1) + 1];
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#ifdef DEBUG_DCI
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printf("i %d idx %d b0-b1 %d-%d mod_dci %d %d\n", i, idx, (((scrambled_payload[(i<<1)>>5])>>((i<<1)&0x1f))&1),
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(((scrambled_payload[((i<<1)+1)>>5])>>(((i<<1)+1)&0x1f))&1), mod_dci[(i<<1)], mod_dci[(i<<1)+1]);
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#endif
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}
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/// Resource mapping
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a = (config.rf_config.tx_antenna_ports.value == 1) ? amp : (amp*ONE_OVER_SQRT2_Q15)>>15;
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for (int aa = 0; aa < config.rf_config.tx_antenna_ports.value; aa++)
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{
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if (cset_start_sc >= frame_parms.ofdm_symbol_size)
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cset_start_sc -= frame_parms.ofdm_symbol_size;
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if (pdcch_params.precoder_granularity == NFAPI_NR_CSET_SAME_AS_REG_BUNDLE) {
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for (int cce_idx=0; cce_idx<dci_alloc.L; cce_idx++){
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cce = dci_alloc.cce_list[cce_idx];
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for (int reg_idx=0; reg_idx<NR_NB_REG_PER_CCE; reg_idx++) {
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k = cset_start_sc + cce.reg_list[reg_idx].start_sc_idx;
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if (k >= frame_parms.ofdm_symbol_size)
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k -= frame_parms.ofdm_symbol_size;
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l = cset_start_symb + cce.reg_list[reg_idx].symb_idx;
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k_prime = 0;
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for (int m=0; m<NR_NB_SC_PER_RB; m++) {
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if ( m == (k_prime<<2)+1) { // DMRS
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((int16_t*)txdataF[aa])[(l*frame_parms.ofdm_symbol_size + k)<<1] = (a * mod_dmrs[l][dmrs_idx<<1]) >> 15;
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((int16_t*)txdataF[aa])[((l*frame_parms.ofdm_symbol_size + k)<<1) + 1] = (a * mod_dmrs[l][(dmrs_idx<<1) + 1]) >> 15;
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k_prime++;
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dmrs_idx++;
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}
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else { // DCI payload
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((int16_t*)txdataF[aa])[(l*frame_parms.ofdm_symbol_size + k)<<1] = (a * mod_dci[dci_idx<<1]) >> 15;
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((int16_t*)txdataF[aa])[((l*frame_parms.ofdm_symbol_size + k)<<1) + 1] = (a * mod_dci[(dci_idx<<1) + 1]) >> 15;
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dci_idx++;
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}
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k++;
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if (k >= frame_parms.ofdm_symbol_size)
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k -= frame_parms.ofdm_symbol_size;
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}
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}
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}
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}
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else { //NFAPI_NR_CSET_ALL_CONTIGUOUS_RBS
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}
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}
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#ifdef DEBUG_DCI
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write_output("txdataF_dci.m", "txdataF_dci", txdataF[0], frame_parms.samples_per_frame_wCP>>1, 1, 1);
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#endif
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return 0;
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}
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