/* * 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_dlsch.c * \brief procedures related to gNB for the DLSCH transport channel * \author Guido Casati * \date 2019 * \email: guido.casati@iis.fraunhofe.de * \version 1.0 * @ingroup _mac */ /*PHY*/ #include "PHY/CODING/coding_defs.h" #include "PHY/defs_nr_common.h" #include "PHY/NR_TRANSPORT/nr_transport_common_proto.h" /*MAC*/ #include "LAYER2/NR_MAC_COMMON/nr_mac.h" #include "LAYER2/NR_MAC_gNB/nr_mac_gNB.h" #include "LAYER2/NR_MAC_COMMON/nr_mac_extern.h" #include "LAYER2/MAC/mac.h" /*NFAPI*/ #include "nfapi_nr_interface.h" /*TAG*/ #include "NR_TAG-Id.h" int nr_generate_dlsch_pdu(module_id_t module_idP, unsigned char *sdus_payload, unsigned char *mac_pdu, unsigned char num_sdus, unsigned short *sdu_lengths, unsigned char *sdu_lcids, unsigned char drx_cmd, unsigned char *ue_cont_res_id, unsigned short post_padding){ gNB_MAC_INST *gNB = RC.nrmac[module_idP]; NR_MAC_SUBHEADER_FIXED *mac_pdu_ptr = (NR_MAC_SUBHEADER_FIXED *) mac_pdu; unsigned char * dlsch_buffer_ptr = sdus_payload; uint8_t last_size = 0; int offset = 0, mac_ce_size, i, timing_advance_cmd, tag_id = 0; // MAC CEs uint8_t mac_header_control_elements[16], *ce_ptr; ce_ptr = &mac_header_control_elements[0]; // 1) Compute MAC CE and related subheaders // DRX command subheader (MAC CE size 0) if (drx_cmd != 255) { mac_pdu_ptr->R = 0; mac_pdu_ptr->LCID = DL_SCH_LCID_DRX; //last_size = 1; mac_pdu_ptr++; } // Timing Advance subheader /* This was done only when timing_advance_cmd != 31 // now TA is always send when ta_timer resets regardless of its value // this is done to avoid issues with the timeAlignmentTimer which is // supposed to monitor if the UE received TA or not */ if (gNB->ta_len){ mac_pdu_ptr->R = 0; mac_pdu_ptr->LCID = DL_SCH_LCID_TA_COMMAND; //last_size = 1; mac_pdu_ptr++; // TA MAC CE (1 octet) timing_advance_cmd = gNB->ta_command; AssertFatal(timing_advance_cmd < 64,"timing_advance_cmd %d > 63\n", timing_advance_cmd); ((NR_MAC_CE_TA *) ce_ptr)->TA_COMMAND = timing_advance_cmd; //(timing_advance_cmd+31)&0x3f; if (gNB->tag->tag_Id != 0){ tag_id = gNB->tag->tag_Id; ((NR_MAC_CE_TA *) ce_ptr)->TAGID = tag_id; } LOG_D(MAC, "NR MAC CE timing advance command = %d (%d) TAG ID = %d\n", timing_advance_cmd, ((NR_MAC_CE_TA *) ce_ptr)->TA_COMMAND, tag_id); mac_ce_size = sizeof(NR_MAC_CE_TA); // Copying bytes for MAC CEs to the mac pdu pointer memcpy((void *) mac_pdu_ptr, (void *) ce_ptr, mac_ce_size); ce_ptr += mac_ce_size; mac_pdu_ptr += (unsigned char) mac_ce_size; } // Contention resolution fixed subheader and MAC CE if (ue_cont_res_id) { mac_pdu_ptr->R = 0; mac_pdu_ptr->LCID = DL_SCH_LCID_CON_RES_ID; mac_pdu_ptr++; //last_size = 1; // contention resolution identity MAC ce has a fixed 48 bit size // this contains the UL CCCH SDU. If UL CCCH SDU is longer than 48 bits, // it contains the first 48 bits of the UL CCCH SDU LOG_T(MAC, "[gNB ][RAPROC] Generate contention resolution msg: %x.%x.%x.%x.%x.%x\n", ue_cont_res_id[0], ue_cont_res_id[1], ue_cont_res_id[2], ue_cont_res_id[3], ue_cont_res_id[4], ue_cont_res_id[5]); // Copying bytes (6 octects) to CEs pointer mac_ce_size = 6; memcpy(ce_ptr, ue_cont_res_id, mac_ce_size); // Copying bytes for MAC CEs to mac pdu pointer memcpy((void *) mac_pdu_ptr, (void *) ce_ptr, mac_ce_size); ce_ptr += mac_ce_size; mac_pdu_ptr += (unsigned char) mac_ce_size; } // 2) Generation of DLSCH MAC SDU subheaders for (i = 0; i < num_sdus; i++) { LOG_D(MAC, "[gNB] Generate DLSCH header num sdu %d len sdu %d\n", num_sdus, sdu_lengths[i]); if (sdu_lengths[i] < 128) { ((NR_MAC_SUBHEADER_SHORT *) mac_pdu_ptr)->R = 0; ((NR_MAC_SUBHEADER_SHORT *) mac_pdu_ptr)->F = 0; ((NR_MAC_SUBHEADER_SHORT *) mac_pdu_ptr)->LCID = sdu_lcids[i]; ((NR_MAC_SUBHEADER_SHORT *) mac_pdu_ptr)->L = (unsigned char) sdu_lengths[i]; last_size = 2; } else { ((NR_MAC_SUBHEADER_LONG *) mac_pdu_ptr)->R = 0; ((NR_MAC_SUBHEADER_LONG *) mac_pdu_ptr)->F = 1; ((NR_MAC_SUBHEADER_LONG *) mac_pdu_ptr)->LCID = sdu_lcids[i]; ((NR_MAC_SUBHEADER_LONG *) mac_pdu_ptr)->L1 = ((unsigned short) sdu_lengths[i] >> 8) & 0x7f; ((NR_MAC_SUBHEADER_LONG *) mac_pdu_ptr)->L2 = (unsigned short) sdu_lengths[i] & 0xff; last_size = 3; } mac_pdu_ptr += last_size; // 3) cycle through SDUs, compute each relevant and place dlsch_buffer in memcpy((void *) mac_pdu_ptr, (void *) dlsch_buffer_ptr, sdu_lengths[i]); dlsch_buffer_ptr+= sdu_lengths[i]; mac_pdu_ptr += sdu_lengths[i]; } // 4) Compute final offset for padding if (post_padding > 0) { ((NR_MAC_SUBHEADER_FIXED *) mac_pdu_ptr)->R = 0; ((NR_MAC_SUBHEADER_FIXED *) mac_pdu_ptr)->LCID = DL_SCH_LCID_PADDING; mac_pdu_ptr++; } else { // no MAC subPDU with padding } // compute final offset offset = ((unsigned char *) mac_pdu_ptr - mac_pdu); //printf("Offset %d \n", ((unsigned char *) mac_pdu_ptr - mac_pdu)); return offset; } /* functionalities of this function have been moved to nr_schedule_uss_dlsch_phytest */ void nr_schedule_ue_spec(module_id_t module_idP, frame_t frameP, sub_frame_t slotP){ }