/* * 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 rar_tools.c * \brief random access tools * \author Raymond Knopp and navid nikaein * \date 2011 - 2014 * \version 1.0 * @ingroup _mac */ #include "mac.h" #include "mac_proto.h" #include "mac_extern.h" #include "SIMULATION/TOOLS/sim.h" #include "common/utils/LOG/log.h" #include "OCG.h" #include "OCG_extern.h" #include "UTIL/OPT/opt.h" #include "common/ran_context.h" #define DEBUG_RAR extern unsigned int localRIV2alloc_LUT25[512]; extern unsigned int distRIV2alloc_LUT25[512]; extern unsigned short RIV2nb_rb_LUT25[512]; extern unsigned short RIV2first_rb_LUT25[512]; extern RAN_CONTEXT_t RC; //------------------------------------------------------------------------------ unsigned short fill_rar(const module_id_t module_idP, const int CC_id, RA_t *ra, const frame_t frameP, uint8_t *const dlsch_buffer, const uint16_t N_RB_UL, const uint8_t input_buffer_length) //------------------------------------------------------------------------------ { RA_HEADER_RAPID *rarh = (RA_HEADER_RAPID *) dlsch_buffer; uint8_t *rar = (uint8_t *) (dlsch_buffer + 1); // subheader fixed rarh->E = 0; // First and last RAR rarh->T = 1; // 0 for E/T/R/R/BI subheader, 1 for E/T/RAPID subheader rarh->RAPID = ra->preamble_index; // Respond to Preamble 0 only for the moment rar[4] = (uint8_t) (ra->rnti >> 8); rar[5] = (uint8_t) (ra->rnti & 0xff); //ra->timing_offset = 0; ra->timing_offset /= 16; //T_A = N_TA/16, where N_TA should be on a 30.72Msps rar[0] = (uint8_t) (ra->timing_offset >> (2 + 4)); // 7 MSBs of timing advance + divide by 4 rar[1] = (uint8_t) (ra->timing_offset << (4 - 2)) & 0xf0; // 4 LSBs of timing advance + divide by 4 COMMON_channels_t *cc = &RC.mac[module_idP]->common_channels[CC_id]; if(N_RB_UL == 25) { ra->msg3_first_rb = 1; } else { if (cc->tdd_Config && N_RB_UL == 100) { ra->msg3_first_rb = 3; } else { ra->msg3_first_rb = 2; } } ra->msg3_nb_rb = 1; uint16_t rballoc = mac_computeRIV(N_RB_UL, ra->msg3_first_rb, ra->msg3_nb_rb); // first PRB only for UL Grant rar[1] |= (rballoc >> 7) & 7; // Hopping = 0 (bit 3), 3 MSBs of rballoc rar[2] = ((uint8_t) (rballoc & 0xff)) << 1; // 7 LSBs of rballoc ra->msg3_mcs = 10; ra->msg3_TPC = 3; ra->msg3_ULdelay = 0; ra->msg3_cqireq = 0; ra->msg3_round = 0; rar[2] |= ((ra->msg3_mcs & 0x8) >> 3); // mcs 10 rar[3] = (((ra->msg3_mcs & 0x7) << 5)) | ((ra->msg3_TPC & 7) << 2) | ((ra->msg3_ULdelay & 1) << 1) | (ra->msg3_cqireq & 1); trace_pdu(DIRECTION_DOWNLINK, dlsch_buffer, input_buffer_length, module_idP, WS_RA_RNTI, 1, RC.mac[module_idP]->frame, RC.mac[module_idP]->subframe, 0, 0); return (ra->rnti); } #if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0)) //------------------------------------------------------------------------------ /* * Fill the RAR buffer (header + PDU) for LTE-M devices */ unsigned short fill_rar_br(eNB_MAC_INST *eNB, int CC_id, RA_t *ra, const frame_t frameP, const sub_frame_t subframeP, uint8_t *const dlsch_buffer, const uint8_t ce_level) //------------------------------------------------------------------------------ { RA_HEADER_RAPID *rarh = (RA_HEADER_RAPID *) dlsch_buffer; COMMON_channels_t *cc = &eNB->common_channels[CC_id]; uint8_t *rar = (uint8_t *)(dlsch_buffer + 1); uint32_t rballoc = 0; uint32_t ULdelay = 0; uint32_t cqireq = 0; uint32_t mpdcch_nb_index = 0; uint32_t TPC = 0; int input_buffer_length = 0; int N_NB_index = 0; AssertFatal(ra != NULL, "RA is null \n"); /* Subheader fixed */ rarh->E = 0; // First and last RAR rarh->T = 1; // 0 for E/T/R/R/BI subheader, 1 for E/T/RAPID subheader rarh->RAPID = ra->preamble_index; // Respond to Preamble /* RAR PDU */ /* TA Command */ ra->timing_offset /= 16; // T_A = N_TA/16, where N_TA should be on a 30.72Msps rar[0] = (uint8_t) (ra->timing_offset >> 4) & 0x7f; // 7 MSBs of timing advance rar[1] = (uint8_t) (ra->timing_offset & 0x0f) << 4; // 4 LSBs of timing advance /* Copy the Msg2 narrowband */ ra->msg34_narrowband = ra->msg2_narrowband; ra->msg3_first_rb = 0; ra->msg3_nb_rb = 2; if (ce_level < 2) { // CE Level 0, 1 (CEmodeA) input_buffer_length = 6; N_NB_index = get_numnarrowbandbits(cc->mib->message.dl_Bandwidth); /* UL Grant */ ra->msg3_mcs = 7; TPC = 3; // no power increase ULdelay = 0; cqireq = 0; mpdcch_nb_index = 0; rballoc = mac_computeRIV(6, ra->msg3_first_rb, ra->msg3_nb_rb); uint32_t buffer = 0; buffer |= ra->msg34_narrowband << (16 + (4 - N_NB_index)); buffer |= ((rballoc & 0x0F) << (12 + (4 - N_NB_index))); buffer |= ((ra->pusch_repetition_levels & 0x03) << (10 + (4 - N_NB_index))); buffer |= ((ra->msg3_mcs & 0x07) << (7 + (4 - N_NB_index))); buffer |= ((TPC & 0x07) << (4 + (4 - N_NB_index))); buffer |= ((cqireq & 0x01) << (3 + (4 - N_NB_index))); buffer |= ((ULdelay & 0x01) << (2 + (4 - N_NB_index))); buffer |= (mpdcch_nb_index << (4 - N_NB_index)); rar[1] |= (uint8_t) (buffer >> 16) & 0x0F; rar[2] = (uint8_t) (buffer >> 8) & 0xFF; rar[3] = (uint8_t) buffer & 0xFF; /* RA CRNTI */ rar[4] = (uint8_t)(ra->rnti >> 8); rar[5] = (uint8_t)(ra->rnti & 0xff); } else { // CE level 2, 3 (CEModeB) AssertFatal(1 == 0, "Shouldn't get here ...\n"); input_buffer_length = 5; rar[3] = (uint8_t)(ra->rnti >> 8); rar[4] = (uint8_t)(ra->rnti & 0xff); } LOG_I(MAC, "[RAPROC] Frame %d Subframe %d : Generating RAR BR (%02x|%02x.%02x.%02x.%02x.%02x.%02x) for ce_level %d, CRNTI %x, preamble %d/%d, TIMING OFFSET %d\n", frameP, subframeP, *(uint8_t *) rarh, rar[0], rar[1], rar[2], rar[3], rar[4], rar[5], ce_level, ra->rnti, rarh->RAPID, ra->preamble_index, ra->timing_offset); trace_pdu(DIRECTION_DOWNLINK, dlsch_buffer, input_buffer_length, eNB->Mod_id, WS_RA_RNTI, 1, eNB->frame, eNB->subframe, 0, 0); return (ra->rnti); } #endif