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