gNB_scheduler_ulsch.c 14.7 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
/*
 * 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 gNB_scheduler_ulsch.c
 * \brief gNB procedures for the ULSCH transport channel
 * \author Navid Nikaein and Raymond Knopp, Guido Casati
 * \date 2019
 * \email: guido.casati@iis.fraunhofer.de
 * \version 1.0
 * @ingroup _mac
 */


#include "LAYER2/NR_MAC_gNB/mac_proto.h"
33 34
#include "executables/softmodem-common.h"
//#define ENABLE_MAC_PAYLOAD_DEBUG 1
35

36

37 38
void nr_process_mac_pdu(
    module_id_t module_idP,
39
    rnti_t rnti,
40 41 42 43 44
    uint8_t CC_id,
    frame_t frameP,
    uint8_t *pduP,
    uint16_t mac_pdu_len)
{
cig's avatar
cig committed
45

46 47
    // This function is adapting code from the old
    // parse_header(...) and ue_send_sdu(...) functions of OAI LTE
cig's avatar
cig committed
48 49 50 51 52

    uint8_t *pdu_ptr = pduP, rx_lcid, done = 0;
    int pdu_len = mac_pdu_len;
    uint16_t mac_ce_len, mac_subheader_len, mac_sdu_len;

53

cig's avatar
cig committed
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
    //  For both DL/UL-SCH
    //  Except:
    //   - UL/DL-SCH: fixed-size MAC CE(known by LCID)
    //   - UL/DL-SCH: padding
    //   - UL-SCH:    MSG3 48-bits
    //  |0|1|2|3|4|5|6|7|  bit-wise
    //  |R|F|   LCID    |
    //  |       L       |
    //  |0|1|2|3|4|5|6|7|  bit-wise
    //  |R|F|   LCID    |
    //  |       L       |
    //  |       L       |

    //  For both DL/UL-SCH
    //  For:
    //   - UL/DL-SCH: fixed-size MAC CE(known by LCID)
    //   - UL/DL-SCH: padding, for single/multiple 1-oct padding CE(s)
    //   - UL-SCH:    MSG3 48-bits
    //  |0|1|2|3|4|5|6|7|  bit-wise
    //  |R|R|   LCID    |
    //  LCID: The Logical Channel ID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC CE or padding as described in Tables 6.2.1-1 and 6.2.1-2 for the DL-SCH and UL-SCH respectively. There is one LCID field per MAC subheader. The LCID field size is 6 bits;
    //  L: The Length field indicates the length of the corresponding MAC SDU or variable-sized MAC CE in bytes. There is one L field per MAC subheader except for subheaders corresponding to fixed-sized MAC CEs and padding. The size of the L field is indicated by the F field;
    //  F: lenght of L is 0:8 or 1:16 bits wide
    //  R: Reserved bit, set to zero.

    while (!done && pdu_len > 0){
80 81 82
        mac_ce_len = 0;
        mac_subheader_len = 1; //  default to fixed-length subheader = 1-oct
        mac_sdu_len = 0;
cig's avatar
cig committed
83 84
        rx_lcid = ((NR_MAC_SUBHEADER_FIXED *)pdu_ptr)->LCID;

85 86
        LOG_D(MAC, "LCID received at gNB side: %d \n", rx_lcid);

cig's avatar
cig committed
87
        switch(rx_lcid){
88 89 90 91 92
            //  MAC CE

            /*#ifdef DEBUG_HEADER_PARSING
              LOG_D(MAC, "[UE] LCID %d, PDU length %d\n", ((NR_MAC_SUBHEADER_FIXED *)pdu_ptr)->LCID, pdu_len);
            #endif*/
93 94 95 96 97 98 99
        case UL_SCH_LCID_RECOMMENDED_BITRATE_QUERY:
              // 38.321 Ch6.1.3.20
              mac_ce_len = 2;
              break;
        case UL_SCH_LCID_CONFIGURED_GRANT_CONFIRMATION:
                // 38.321 Ch6.1.3.7
                break;
100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181
        case UL_SCH_LCID_S_BSR:
        	//38.321 section 6.1.3.1
        	//fixed length
        	mac_ce_len =1;
        	/* Extract short BSR value */
        	break;

        case UL_SCH_LCID_S_TRUNCATED_BSR:
        	//38.321 section 6.1.3.1
        	//fixed length
        	mac_ce_len =1;
        	/* Extract short truncated BSR value */
        	break;

        case UL_SCH_LCID_L_BSR:
        	//38.321 section 6.1.3.1
        	//variable length
        	mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
        	mac_subheader_len = 2;
        	if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
        		mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
        		mac_subheader_len = 3;
        	}
        	/* Extract long BSR value */
        	break;

        case UL_SCH_LCID_L_TRUNCATED_BSR:
        	//38.321 section 6.1.3.1
        	//variable length
        	mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
        	mac_subheader_len = 2;
        	if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
        		mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
        		mac_subheader_len = 3;
        	}
        	/* Extract long truncated BSR value */
        	break;


        case UL_SCH_LCID_C_RNTI:
        	//38.321 section 6.1.3.2
        	//fixed length
        	mac_ce_len = 2;
        	/* Extract CRNTI value */
        	break;

        case UL_SCH_LCID_SINGLE_ENTRY_PHR:
        	//38.321 section 6.1.3.8
        	//fixed length
        	mac_ce_len = 2;
        	/* Extract SINGLE ENTRY PHR elements for PHR calculation */
        	break;

        case UL_SCH_LCID_MULTI_ENTRY_PHR_1_OCT:
        	//38.321 section 6.1.3.9
        	//  varialbe length
        	mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
        	mac_subheader_len = 2;
        	if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
        		mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
        		mac_subheader_len = 3;
        	}
        	/* Extract MULTI ENTRY PHR elements from single octet bitmap for PHR calculation */
        	break;

        case UL_SCH_LCID_MULTI_ENTRY_PHR_4_OCT:
        	//38.321 section 6.1.3.9
        	//  varialbe length
        	mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
        	mac_subheader_len = 2;
        	if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
        		mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
        		mac_subheader_len = 3;
        	}
        	/* Extract MULTI ENTRY PHR elements from four octets bitmap for PHR calculation */
        	break;

        case UL_SCH_LCID_PADDING:
        	done = 1;
        	//  end of MAC PDU, can ignore the rest.
        	break;

182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
        // MAC SDUs
        case UL_SCH_LCID_SRB1:
              // todo
              break;
        case UL_SCH_LCID_SRB2:
              // todo
              break;
        case UL_SCH_LCID_SRB3:
              // todo
              break;
        case UL_SCH_LCID_CCCH_MSG3:
              // todo
              break;
        case UL_SCH_LCID_CCCH:
              // todo
              mac_subheader_len = 2;
              break;

200 201 202 203 204 205 206 207 208 209 210 211 212
        case UL_SCH_LCID_DTCH:
                //  check if LCID is valid at current time.
                if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
                    //mac_sdu_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
                    mac_subheader_len = 3;
                    mac_sdu_len = ((uint16_t)(((NR_MAC_SUBHEADER_LONG *) pdu_ptr)->L1 & 0x7f) << 8)
                    | ((uint16_t)((NR_MAC_SUBHEADER_LONG *) pdu_ptr)->L2 & 0xff);

                } else {
                  mac_sdu_len = (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
                  mac_subheader_len = 2;
                }

213
                LOG_D(MAC, "[UE %d] Frame %d : ULSCH -> UL-DTCH %d (gNB %d, %d bytes)\n", module_idP, frameP, rx_lcid, module_idP, mac_sdu_len);
214
		int UE_id = find_nr_UE_id(module_idP, rnti);
215
		RC.nrmac[module_idP]->UE_info.mac_stats[UE_id].lc_bytes_rx[rx_lcid] += mac_sdu_len;
216
                #if defined(ENABLE_MAC_PAYLOAD_DEBUG)
217
		    log_dump(MAC, pdu_ptr + mac_subheader_len, 32, LOG_DUMP_CHAR, "\n");
218 219

                #endif
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244
                if(IS_SOFTMODEM_NOS1){
                  mac_rlc_data_ind(module_idP,
                      0x1234,
                      module_idP,
                      frameP,
                      ENB_FLAG_YES,
                      MBMS_FLAG_NO,
                      rx_lcid,
                      (char *) (pdu_ptr + mac_subheader_len),
                      mac_sdu_len,
                      1,
                      NULL);
                }
                else{
                  mac_rlc_data_ind(module_idP,
                      rnti,
                      module_idP,
                      frameP,
                      ENB_FLAG_YES,
                      MBMS_FLAG_NO,
                      rx_lcid,
                      (char *) (pdu_ptr + mac_subheader_len),
                      mac_sdu_len,
                      1,
                      NULL);
245 246
                }

247

248 249 250 251 252
            break;

        default:
        	return;
        	break;
cig's avatar
cig committed
253 254 255 256
        }
        pdu_ptr += ( mac_subheader_len + mac_ce_len + mac_sdu_len );
        pdu_len -= ( mac_subheader_len + mac_ce_len + mac_sdu_len );

257
        if (pdu_len < 0) {
258
          LOG_E(MAC, "%s() residual mac pdu length < 0!, pdu_len: %d\n", __func__, pdu_len);
259 260
          return;
        }
261 262
    }
}
263

264
void handle_nr_ul_harq(uint16_t slot, NR_UE_sched_ctrl_t *sched_ctrl, NR_mac_stats_t *stats, nfapi_nr_crc_t crc_pdu) {
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288

  int max_harq_rounds = 4; // TODO define macro
  uint8_t hrq_id = crc_pdu.harq_id;
  NR_UE_ul_harq_t *cur_harq = &sched_ctrl->ul_harq_processes[hrq_id];
  if (cur_harq->state==ACTIVE_SCHED) {
    if (!crc_pdu.tb_crc_status) {
      cur_harq->ndi ^= 1;
      cur_harq->round = 0;
      cur_harq->state = INACTIVE; // passed -> make inactive. can be used by scheduder for next grant
#ifdef UL_HARQ_PRINT
      printf("[HARQ HANDLER] Ulharq id %d crc passed, freeing it for scheduler\n",hrq_id);
#endif
    } else {
      cur_harq->round++;
      cur_harq->state = ACTIVE_NOT_SCHED;
#ifdef UL_HARQ_PRINT
      printf("[HARQ HANDLER] Ulharq id %d crc failed, requesting retransmission\n",hrq_id);
#endif
    }

    if (!(cur_harq->round<max_harq_rounds)) {
      cur_harq->ndi ^= 1;
      cur_harq->state = INACTIVE; // failed after 4 rounds -> make inactive
      cur_harq->round = 0;
289 290
      LOG_D(MAC,"[HARQ HANDLER] RNTI %x: Ulharq id %d crc failed in all round, freeing it for scheduler\n",crc_pdu.rnti,hrq_id);
      stats->ulsch_errors++;
291 292 293
    }
    return;
  } else
294
    LOG_E(MAC,"Incorrect ULSCH HARQ process %d or invalid state %d\n",hrq_id,cur_harq->state);
295 296
}

297 298 299
/*
* When data are received on PHY and transmitted to MAC
*/
300 301 302
void nr_rx_sdu(const module_id_t gnb_mod_idP,
               const int CC_idP,
               const frame_t frameP,
303
               const sub_frame_t slotP,
304 305 306 307
               const rnti_t rntiP,
               uint8_t *sduP,
               const uint16_t sdu_lenP,
               const uint16_t timing_advance,
308 309
               const uint8_t ul_cqi,
               const uint16_t rssi){
310
  int current_rnti = 0, UE_id = -1, harq_pid = 0;
311
  gNB_MAC_INST *gNB_mac = NULL;
312
  NR_UE_info_t *UE_info = NULL;
313
  NR_UE_sched_ctrl_t *UE_scheduling_control = NULL;
314 315

  current_rnti = rntiP;
cig's avatar
cig committed
316
  UE_id = find_nr_UE_id(gnb_mod_idP, current_rnti);
317
  gNB_mac = RC.nrmac[gnb_mod_idP];
318
  UE_info = &gNB_mac->UE_info;
319
  int target_snrx10 = gNB_mac->pusch_target_snrx10;
320

321 322 323 324 325 326
  if (sduP != NULL) {
    T(T_GNB_MAC_UL_PDU_WITH_DATA, T_INT(gnb_mod_idP), T_INT(CC_idP),
      T_INT(rntiP), T_INT(frameP), T_INT(slotP), T_INT(-1) /* harq_pid */,
      T_BUFFER(sduP, sdu_lenP));
  }

327
  if (UE_id != -1) {
328
    UE_scheduling_control = &(UE_info->UE_sched_ctrl[UE_id]);
329

330
    UE_info->mac_stats[UE_id].ulsch_total_bytes_rx += sdu_lenP;
331
    LOG_D(MAC, "[gNB %d][PUSCH %d] CC_id %d %d.%d Received ULSCH sdu from PHY (rnti %x, UE_id %d) ul_cqi %d\n",
332 333 334 335
          gnb_mod_idP,
          harq_pid,
          CC_idP,
          frameP,
336
          slotP,
337 338 339 340
          current_rnti,
          UE_id,
          ul_cqi);

341 342 343
    // if not missed detection (10dB threshold for now)
    if (UE_scheduling_control->ul_rssi < (100+rssi)) {
      UE_scheduling_control->tpc0 = nr_get_tpc(target_snrx10,ul_cqi,30);
344 345
      if (timing_advance != 0xffff)
        UE_scheduling_control->ta_update = timing_advance;
Francesco Mani's avatar
Francesco Mani committed
346
      UE_scheduling_control->ul_rssi = rssi;
347
      LOG_D(MAC, "[UE %d] PUSCH TPC %d and TA %d\n",UE_id,UE_scheduling_control->tpc0,UE_scheduling_control->ta_update);
348 349 350 351 352
    }
    else{
      UE_scheduling_control->tpc0 = 1;
    }

353
#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
Laurent's avatar
Laurent committed
354

355 356
    LOG_I(MAC, "Printing received UL MAC payload at gNB side: %d \n");
    for (int i = 0; i < sdu_lenP ; i++) {
357 358 359
	  //harq_process_ul_ue->a[i] = (unsigned char) rand();
	  //printf("a[%d]=0x%02x\n",i,harq_process_ul_ue->a[i]);
	  printf("%02x ",(unsigned char)sduP[i]);
360 361
    }
    printf("\n");
Laurent's avatar
Laurent committed
362

363 364 365 366
#endif

    if (sduP != NULL){
      LOG_D(MAC, "Received PDU at MAC gNB \n");
367
      nr_process_mac_pdu(gnb_mod_idP, current_rnti, CC_idP, frameP, sduP, sdu_lenP);
cig's avatar
cig committed
368
    }
369 370 371
    else {

    }
372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419
  } else {
    if (!sduP) // check that CRC passed
      return;

    /* we don't know this UE (yet). Check whether there is a ongoing RA (Msg 3)
     * and check the corresponding UE's RNTI match, in which case we activate
     * it. */
    for (int i = 0; i < NR_NB_RA_PROC_MAX; ++i) {
      NR_RA_t *ra = &gNB_mac->common_channels[CC_idP].ra[i];
      if (ra->state != WAIT_Msg3)
        continue;

      // random access pusch with TC-RNTI
      if (ra->rnti != current_rnti) {
        LOG_W(MAC,
              "expected TC-RNTI %04x to match current RNTI %04x\n",
              ra->rnti,
              current_rnti);
        continue;
      }
      const int UE_id = add_new_nr_ue(gnb_mod_idP, ra->rnti);
      UE_info->secondaryCellGroup[UE_id] = ra->secondaryCellGroup;
      compute_csi_bitlen(ra->secondaryCellGroup, UE_info, UE_id);
      UE_info->UE_beam_index[UE_id] = ra->beam_id;
      struct NR_ServingCellConfig__downlinkBWP_ToAddModList *bwpList = ra->secondaryCellGroup->spCellConfig->spCellConfigDedicated->downlinkBWP_ToAddModList;
      AssertFatal(bwpList->list.count == 1,
                  "downlinkBWP_ToAddModList has %d BWP!\n",
                  bwpList->list.count);
      const int bwp_id = 1;
      UE_info->UE_sched_ctrl[UE_id].active_bwp = bwpList->list.array[bwp_id - 1];
      LOG_I(MAC,
            "[gNB %d][RAPROC] PUSCH with TC_RNTI %x received correctly, "
            "adding UE MAC Context UE_id %d/RNTI %04x\n",
            gnb_mod_idP,
            current_rnti,
            UE_id,
            ra->rnti);
      // re-initialize ta update variables afrer RA procedure completion
      UE_info->UE_sched_ctrl[UE_id].ta_frame = frameP;

      free(ra->preambles.preamble_list);
      ra->state = RA_IDLE;
      LOG_I(MAC,
            "reset RA state information for RA-RNTI %04x/index %d\n",
            ra->rnti,
            i);
      return;
    }
420
  }
421

422
}