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