Time Alignment procedure with time adjustment as per TS 38.213 section 4.2

- UE processing capability 1
- Setting the TA update to be applied after the reception of the TA command
- Durations of N1 and N2 symbols corresponding to PDSCH and PUSCH are
  computed according to sections 5.3 and 6.4 of TS 38.214
- Introduced tables 5.3-1, 5.3-2, 6.4-1, 6.4-2 from TS 38.214

openair1/PHY/INIT/nr_init_ue.c

@@ -703,11 +703,21 @@ int init_nr_ue_signal(PHY_VARS_NR_UE *ue,
     ue->pusch_config.pusch_TimeDomainResourceAllocation[i]->mappingType = typeA;
   }
 
+  for (i=0;i<MAX_NR_OF_DL_ALLOCATIONS;i++){
+    ue->PDSCH_Config.pdsch_TimeDomainResourceAllocation[i] = (NR_PDSCH_TimeDomainResourceAllocation_t *)malloc16(sizeof(NR_PDSCH_TimeDomainResourceAllocation_t));
+    ue->PDSCH_Config.pdsch_TimeDomainResourceAllocation[i]->mappingType = typeA;
+  }
+
   //------------- config DMRS parameters--------------//
   ue->dmrs_UplinkConfig.pusch_dmrs_type = pusch_dmrs_type1;
   ue->dmrs_UplinkConfig.pusch_dmrs_AdditionalPosition = pusch_dmrs_pos0;
   ue->dmrs_UplinkConfig.pusch_maxLength = pusch_len1;
   //-------------------------------------------------//
+  ue->dmrs_DownlinkConfig.pdsch_dmrs_type = pdsch_dmrs_type1;
+  ue->dmrs_DownlinkConfig.pdsch_dmrs_AdditionalPosition = pdsch_dmrs_pos0;
+  ue->dmrs_DownlinkConfig.pdsch_maxLength = pdsch_len1;
+  //-------------------------------------------------//
+
   ue->nr_gold_pusch_dmrs = (uint32_t ****)malloc16(fp->slots_per_frame*sizeof(uint32_t ***));
   pusch_dmrs             = ue->nr_gold_pusch_dmrs;
   n_scid = 0; // This quantity is indicated by higher layer parameter dmrs-SeqInitialization

openair1/PHY/impl_defs_nr.h

@@ -36,6 +36,7 @@
 
 #include <stdbool.h>
 #include "types.h"
+#include "NR_PDSCH-TimeDomainResourceAllocation.h"
 
 #ifdef DEFINE_VARIABLES_PHY_IMPLEMENTATION_DEFS_NR_H
 #define EXTERN
@@ -379,6 +380,8 @@ typedef enum {
 ////////////////////////////////////////////////////////////////////////////////################################
 #define MAX_NR_RATE_MATCH_PATTERNS            4
 #define MAX_NR_ZP_CSI_RS_RESOURCES           32
+#define MAX_NR_OF_DL_ALLOCATIONS             16
+#define MAX_NR_OF_UL_ALLOCATIONS            (16)
 
 typedef enum{
   dl_resourceAllocationType0 = 1,
@@ -473,6 +476,8 @@ typedef struct {
 */
   maxNrofCodeWordsScheduledByDCI_t maxNrofCodeWordsScheduledByDCI;
 
+  NR_PDSCH_TimeDomainResourceAllocation_t *pdsch_TimeDomainResourceAllocation[MAX_NR_OF_DL_ALLOCATIONS];
+
 } PDSCH_Config_t;
 
 /***********************************************************************
@@ -483,7 +488,6 @@ typedef struct {
 *
 ************************************************************************/
 
-#define MAX_NR_OF_UL_ALLOCATIONS            (16)
 
 typedef enum {
   enable_tpc_accumulation = 0,  /* by default it is enable */

openair1/SCHED_NR_UE/phy_procedures_nr_ue.c

@@ -45,6 +45,7 @@
 //#include "PHY/extern.h"
 #include "SCHED_NR_UE/defs.h"
 #include "SCHED_NR/extern.h"
+#include "SCHED_NR_UE/phy_sch_processing_time.h"
 //#include <sched.h>
 //#include "targets/RT/USER/nr-softmodem.h"
 #include "PHY/NR_UE_ESTIMATION/nr_estimation.h"
@@ -3549,7 +3550,17 @@ void nr_ue_dlsch_procedures(PHY_VARS_NR_UE *ue,
   NR_UL_TIME_ALIGNMENT_t *ul_time_alignment = &ue->ul_time_alignment[eNB_id];
   unsigned char *apply_ta = &ul_time_alignment->apply_ta;
   uint16_t slots_per_frame = ue->frame_parms.slots_per_frame;
-  int ul_tx_timing_adjustment = 6; // temporary hardcoded
+  uint16_t slots_per_subframe = ue->frame_parms.slots_per_subframe;
+  uint8_t numerology = ue->frame_parms.numerology_index, mapping_type_ul, mapping_type_dl;
+  int ul_tx_timing_adjustment, N_TA_max, factor_mu, N_t_1, N_t_2, N_1, N_2, d_1_1, d_2_1, d;
+  uint8_t d_2_2 = 0;// set to 0 because there is only 1 BWP
+                    // TODO this should corresponds to the switching time as defined in
+                    // TS 38.133
+  uint16_t ofdm_symbol_size = ue->frame_parms.ofdm_symbol_size;
+  uint16_t nb_prefix_samples = ue->frame_parms.nb_prefix_samples;
+  uint32_t t_subframe = 1; // subframe duration of 1 msec
+  uint16_t bw_scaling, start_symbol;
+  float tc_factor;
 
   if (dlsch0==NULL)
     AssertFatal(0,"dlsch0 should be defined at this level \n");
@@ -3558,6 +3569,7 @@ void nr_ue_dlsch_procedures(PHY_VARS_NR_UE *ue,
   harq_pid = dlsch0->current_harq_pid;
   is_cw0_active = dlsch0->harq_processes[harq_pid]->status;
   nb_symb_sch = dlsch0->harq_processes[harq_pid]->nb_symbols;
+  start_symbol = dlsch0->harq_processes[harq_pid]->start_symbol;
 
 
 
@@ -3887,8 +3899,70 @@ void nr_ue_dlsch_procedures(PHY_VARS_NR_UE *ue,
           break;
         }
 
-        /* Time alignment procedure set the TA to be applied 6 slots 
-        // after the reception of the command */
+        // scale the 16 factor in N_TA calculation in 38.213 section 4.2 according to the used FFT size
+        switch (ue->frame_parms.N_RB_DL) {
+          case 106: bw_scaling = 16; break;
+          case 217: bw_scaling = 32; break;
+          case 245: bw_scaling = 32; break;
+          case 273: bw_scaling = 32; break;
+          default: abort();
+        }
+
+        /* Time Alignment procedure
+        // - UE processing capability 1
+        // - Setting the TA update to be applied after the reception of the TA command
+        // - Timing adjustment computed according to TS 38.213 section 4.2
+        // - Durations of N1 and N2 symbols corresponding to PDSCH and PUSCH are
+        //   computed according to sections 5.3 and 6.4 of TS 38.214 */
+        factor_mu = 1 << numerology;
+        N_TA_max = 3846 * bw_scaling / factor_mu;
+
+        /* PDSCH decoding time N_1 for processing capability 1 */
+        if (ue->dmrs_DownlinkConfig.pdsch_dmrs_AdditionalPosition == pdsch_dmrs_pos0)
+          N_1 = pdsch_N_1_capability_1[numerology][1];
+        else if (ue->dmrs_DownlinkConfig.pdsch_dmrs_AdditionalPosition == pdsch_dmrs_pos1 || ue->dmrs_DownlinkConfig.pdsch_dmrs_AdditionalPosition == 2) // TODO set to pdsch_dmrs_pos2 when available
+          N_1 = pdsch_N_1_capability_1[numerology][2];
+        else
+          N_1 = pdsch_N_1_capability_1[numerology][3];
+
+        /* PUSCH preapration time N_2 for processing capability 1 */
+        N_2 = pusch_N_2_timing_capability_1[numerology][1];
+        mapping_type_dl = ue->PDSCH_Config.pdsch_TimeDomainResourceAllocation[0]->mappingType;
+        mapping_type_ul = ue->pusch_config.pusch_TimeDomainResourceAllocation[0]->mappingType;
+
+        /* d_1_1 depending on the number of PDSCH symbols allocated */
+        d = 0; // TODO number of overlapping symbols of the scheduling PDCCH and the scheduled PDSCH
+        if (mapping_type_dl == typeA)
+         if (nb_symb_sch + start_symbol < 7)
+          d_1_1 = 7 - (nb_symb_sch + start_symbol);
+         else
+          d_1_1 = 0;
+        else // mapping type B
+          switch (nb_symb_sch){
+            case 7: d_1_1 = 0; break;
+            case 4: d_1_1 = 3; break;
+            case 2: d_1_1 = 3 + d; break;
+            default: break;
+          }
+
+        /* d_2_1 */
+        if (mapping_type_ul == typeB && start_symbol != 0)
+          d_2_1 = 0;
+        else
+          d_2_1 = 1;
+
+        /* N_t_1 time duration in msec of N_1 symbols corresponding to a PDSCH reception time
+        // N_t_2 time duration in msec of N_2 symbols corresponding to a PUSCH preparation time */
+        N_t_1 = (N_1 + d_1_1) * (ofdm_symbol_size + nb_prefix_samples) / factor_mu;
+        N_t_2 = (N_2 + d_2_1) * (ofdm_symbol_size + nb_prefix_samples) / factor_mu;
+        if (N_t_2 < d_2_2) N_t_2 = d_2_2;
+
+        /* Time alignment procedure */
+        // N_t_1 + N_t_2 + N_TA_max is in unit of Ts, therefore must be converted to Tc
+        // N_t_1 + N_t_2 + N_TA_max must be in msec
+        tc_factor = 64 * 0.509 * 10e-7;
+        ul_tx_timing_adjustment = 1 + ceil(slots_per_subframe*((N_t_1 + N_t_2 + N_TA_max)*tc_factor + 0.5)/t_subframe);
+
         if (ul_time_alignment->apply_ta == 1){
           ul_time_alignment->ta_slot = (nr_tti_rx + ul_tx_timing_adjustment) % slots_per_frame;
           if (nr_tti_rx + ul_tx_timing_adjustment > slots_per_frame){

openair1/SCHED_NR_UE/phy_sch_processing_time.h

+/*
+ * 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_sch_processing_time.h
+ \brief         tables for UE PDSCH processing and UE PUSCH preparation procedure time
+                from TS 38.214 Physical procedures for data v15.6.0
+ \author        Guido Casati
+ \date 	        2019
+ \version       0.1
+ \company       Fraunhofer IIS
+ \email:        guido.casati@iis.fraunhofer.de
+ \note
+ \warning
+*/
+
+/* TS 38.214 Table 5.3-1: PDSCH processing time for PDSCH processing capability 1
+//   corresponding to the PDSCH decoding time N_1 [symbols]
+// where mu corresponds to the one of {mu_PDCCH, mu_PDSCH, mu_UL}
+//   resulting with the largest T_proc_1
+// where mu_PDCCH is the SCS of PDCCH scheduling PDSCH
+//   mu_PDSCH is the SCS of the scheduled PDSCH
+//   mu_UL is the SCS of the UL channel with which the HARQ-ACK is to be transmitted
+// column A is N_1 corresponding to dmrs-AdditionalPosition pos0 in DMRS-DownlinkConfig
+//   in both dmrs-DownlinkForPDSCH-MappingTypeA and dmrs-DownlinkForPDSCH-MappingTypeB
+// column B is N_1 corresponding to corresponds to dmrs-AdditionalPosition !0
+//   in DMRS-DownlinkConfig in both dmrs-DownlinkForPDSCH-MappingTypeA,
+//   dmrs-DownlinkForPDSCH-MappingTypeB or if the higher layer param is not configured
+//   when PDSCH DM-RS position l1 for the additional DM-RS is l1 = 1,2
+// column C is N_1 corresponding to corresponds to dmrs-AdditionalPosition !0
+//   in DMRS-DownlinkConfig in both dmrs-DownlinkForPDSCH-MappingTypeA,
+//   dmrs-DownlinkForPDSCH-MappingTypeB or if the higher layer param is not configured
+//   when PDSCH DM-RS position l1 for the additional DM-RS is != 1,2
+
+*/
+int8_t pdsch_N_1_capability_1[4][4] = {
+/* mu      A            B            C   */
+{  0,      8,           14,          13  },
+{  1,      10,          13,          13  },
+{  2,      17,          20,          20  },
+{  3,      20,          24,          24  },
+};
+
+/* TS 38.214 Table 5.3-2: PDSCH processing time for PDSCH processing capability 2
+//   corresponding to the PDSCH decoding time N_1 [symbols]
+// where mu corresponds to the one of {mu_PDCCH, mu_PDSCH, mu_UL}
+//   resulting with the largest T_proc_1
+// where mu_PDCCH is the SCS of PDCCH scheduling PDSCH
+//   mu_PDSCH is the SCS of the scheduled PDSCH
+//   mu_UL is the SCS of the UL channel with which the HARQ-ACK is to be transmitted
+// column A is N_1 corresponding to dmrs-AdditionalPosition pos0 in DMRS-DownlinkConfig in both
+//   dmrs-DownlinkForPDSCH-MappingTypeA and dmrs-DownlinkForPDSCH-MappingTypeB
+// mu == 2 is for FR1 only
+*/
+float pdsch_N_1_capability_2[3][2] = {
+/* mu      A */   
+{  0,      3   },
+{  1,      4.5 },
+{  2,      9   },
+};
+
+/* TS 38.214 Table 6.4-1: PUSCH preparation time for PUSCH timing capability 1
+//   corresponding to the PUSCH preparation time N_2 [symbols]
+// where mu corresponds to the one of {mu_DL, mu_UL}
+//   resulting with the largest T_proc_2
+// where mu_DL is the SCS with which the PDCCH
+//   carrying the DCI scheduling the PUSCH was transmitted
+//   mu_UL is the SCS of the UL channel with which PUSCH to be transmitted
+*/
+int8_t pusch_N_2_timing_capability_1[4][2] = {
+/* mu      N_2   */
+{  0,      10 },
+{  1,      12 },
+{  2,      23 },
+{  3,      36 },
+};
+
+/* TS 38.214 Table 6.4-2: PUSCH preparation time for PUSCH timing capability 2
+//   corresponding to the PUSCH preparation time N_2 [symbols]
+// where mu corresponds to the one of {mu_DL, mu_UL}
+//   resulting with the largest T_proc_2
+// where mu_DL is the SCS with which the PDCCH
+//   carrying the DCI scheduling the PUSCH was transmitted
+//   mu_UL is the SCS of the UL channel with which PUSCH to be transmitted
+// mu == 2 is for FR1 only
+*/
+float pusch_N_2_timing_capability_2[3][2] = {
+/* mu      N_2   */
+{  0,      5   },
+{  1,      5.5 },
+{  2,      11  },
+};
\ No newline at end of file