143 lines
5.6 KiB
C
143 lines
5.6 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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//------------------------------------------------------------------------------
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uint16_t ue_process_rar(const module_id_t module_idP, const int CC_id, const frame_t frameP, const rnti_t ra_rnti, uint8_t *const dlsch_buffer, rnti_t *const t_crnti, const uint8_t preamble_index,
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uint8_t *selected_rar_buffer // output argument for storing the selected RAR header and RAR payload
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)
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//------------------------------------------------------------------------------
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{
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uint16_t ret = 0; // return value
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RA_HEADER_RAPID *rarh = (RA_HEADER_RAPID *) dlsch_buffer;
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// RAR_PDU *rar = (RAR_PDU *)(dlsch_buffer+1);
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uint8_t *rar = (uint8_t *) (dlsch_buffer + 1);
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// get the last RAR payload for working with CMW500
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uint8_t n_rarpy = 0; // number of RAR payloads
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uint8_t n_rarh = 0; // number of MAC RAR subheaders
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uint8_t best_rx_rapid = -1; // the closest RAPID receive from all RARs
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while (1) {
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n_rarh++;
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if (rarh->T == 1) {
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n_rarpy++;
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LOG_D(MAC, "RAPID %d\n", rarh->RAPID);
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}
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if (rarh->RAPID == preamble_index) {
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LOG_D(PHY, "Found RAR with the intended RAPID %d\n",
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rarh->RAPID);
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rar = (uint8_t *) (dlsch_buffer + n_rarh + (n_rarpy - 1) * 6);
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UE_mac_inst[module_idP].UE_mode[0] = RA_RESPONSE;
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break;
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}
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if (abs((int) rarh->RAPID - (int) preamble_index) <
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abs((int) best_rx_rapid - (int) preamble_index)) {
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best_rx_rapid = rarh->RAPID;
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rar = (uint8_t *) (dlsch_buffer + n_rarh + (n_rarpy - 1) * 6);
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}
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if (rarh->E == 0) {
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LOG_I(MAC,
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"No RAR found with the intended RAPID. The closest RAPID in all RARs is %d\n",
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best_rx_rapid);
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UE_mac_inst[module_idP].UE_mode[0] = PRACH;
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break;
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} else {
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rarh++;
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}
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};
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LOG_D(MAC, "number of RAR subheader %d; number of RAR pyloads %d\n",
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n_rarh, n_rarpy);
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if (CC_id > 0) {
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LOG_W(MAC, "Should not have received RAR on secondary CCs! \n");
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return (0xffff);
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}
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LOG_A(MAC,
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"[UE %d][RAPROC] Frame %d Received RAR (%02x|%02x.%02x.%02x.%02x.%02x.%02x) for preamble %d/%d\n",
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module_idP, frameP, *(uint8_t *) rarh, rar[0], rar[1], rar[2],
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rar[3], rar[4], rar[5], rarh->RAPID, preamble_index);
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#ifdef DEBUG_RAR
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LOG_D(MAC, "[UE %d][RAPROC] rarh->E %d\n", module_idP, rarh->E);
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LOG_D(MAC, "[UE %d][RAPROC] rarh->T %d\n", module_idP, rarh->T);
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LOG_D(MAC, "[UE %d][RAPROC] rarh->RAPID %d\n", module_idP,
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rarh->RAPID);
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// LOG_I(MAC,"[UE %d][RAPROC] rar->R %d\n",module_idP,rar->R);
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LOG_D(MAC, "[UE %d][RAPROC] rar->Timing_Advance_Command %d\n",
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module_idP, (((uint16_t) (rar[0] & 0x7f)) << 4) + (rar[1] >> 4));
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// LOG_I(MAC,"[UE %d][RAPROC] rar->hopping_flag %d\n",module_idP,rar->hopping_flag);
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// LOG_I(MAC,"[UE %d][RAPROC] rar->rb_alloc %d\n",module_idP,rar->rb_alloc);
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// LOG_I(MAC,"[UE %d][RAPROC] rar->mcs %d\n",module_idP,rar->mcs);
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// LOG_I(MAC,"[UE %d][RAPROC] rar->TPC %d\n",module_idP,rar->TPC);
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// LOG_I(MAC,"[UE %d][RAPROC] rar->UL_delay %d\n",module_idP,rar->UL_delay);
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// LOG_I(MAC,"[UE %d][RAPROC] rar->cqi_req %d\n",module_idP,rar->cqi_req);
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LOG_D(MAC, "[UE %d][RAPROC] rar->t_crnti %x\n", module_idP,
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(uint16_t) rar[5] + (rar[4] << 8));
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#endif
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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 = n_rarh + n_rarpy * 6,
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.ueid = module_idP,
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.rntiType = WS_RA_RNTI,
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.rnti = ra_rnti,
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.sysFrame = UE_mac_inst[module_idP].rxFrame,
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.subframe = UE_mac_inst[module_idP].rxSubframe};
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trace_pdu(&tmp);
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if (preamble_index == rarh->RAPID) {
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*t_crnti = (uint16_t) rar[5] + (rar[4] << 8); //rar->t_crnti;
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UE_mac_inst[module_idP].crnti = *t_crnti; //rar->t_crnti;
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//return(rar->Timing_Advance_Command);
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ret = ((((uint16_t) (rar[0] & 0x7f)) << 4) + (rar[1] >> 4));
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} else {
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UE_mac_inst[module_idP].crnti = 0;
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ret = (0xffff);
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}
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// move the selected RAR to the front of the RA_PDSCH buffer
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memmove(selected_rar_buffer + 0, (uint8_t *) rarh, 1);
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memmove(selected_rar_buffer + 1, (uint8_t *) rar, 6);
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return ret;
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}
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