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openairinterface5g/openair2/LAYER2/MAC/rar_tools.c
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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 1.0 (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 "defs.h"
#include "proto.h"
#include "extern.h"
#include "SIMULATION/TOOLS/defs.h"
#include "UTIL/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,
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;
// RAR_PDU *rar = (RAR_PDU *)(dlsch_buffer+1);
uint8_t *rar = (uint8_t *)(dlsch_buffer+1);
int i,ra_idx = -1;
RA_TEMPLATE *RA_template;
AssertFatal(CC_id < MAX_NUM_CCs, "CC_id %u < MAX_NUM_CCs %u", CC_id, MAX_NUM_CCs);
for (i=0; i<NB_RA_PROC_MAX; i++) {
if (RC.mac[module_idP]->common_channels[CC_id].RA_template[i].generate_rar == 1) {
ra_idx=i;
RC.mac[module_idP]->common_channels[CC_id].RA_template[i].generate_rar = 0;
break;
}
}
RA_template = &RC.mac[module_idP]->common_channels[CC_id].RA_template[ra_idx];
//DevAssert( ra_idx != -1 );
if (ra_idx==-1)
return(0);
// 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_template->preamble_index; // Respond to Preamble 0 only for the moment
rar[4] = (uint8_t)(RA_template->rnti>>8);
rar[5] = (uint8_t)(RA_template->rnti&0xff);
//RA_template->timing_offset = 0;
RA_template->timing_offset /= 16; //T_A = N_TA/16, where N_TA should be on a 30.72Msps
rar[0] = (uint8_t)(RA_template->timing_offset>>(2+4)); // 7 MSBs of timing advance + divide by 4
rar[1] = (uint8_t)(RA_template->timing_offset<<(4-2))&0xf0; // 4 LSBs of timing advance + divide by 4
RA_template->msg3_first_rb=1;
RA_template->msg3_nb_rb=1;
uint16_t rballoc = mac_computeRIV(N_RB_UL,RA_template->msg3_first_rb,RA_template->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_template->msg3_mcs = 10;
RA_template->msg3_TPC = 3;
RA_template->msg3_ULdelay = 0;
RA_template->msg3_cqireq = 0;
rar[2] |= ((RA_template->msg3_mcs&0x8)>>3); // mcs 10
rar[3] = (((RA_template->msg3_mcs&0x7)<<5)) | ((RA_template->msg3_TPC&7)<<2) | ((RA_template->msg3_ULdelay&1)<<1) | (RA_template->msg3_cqireq&1);
LOG_D(MAC,"[eNB %d][RAPROC] CC_id %d Frame %d Generating RAR (%02x|%02x.%02x.%02x.%02x.%02x.%02x) for ra_idx %d, CRNTI %x,preamble %d/%d,TIMING OFFSET %d\n",
module_idP, CC_id,
frameP,
*(uint8_t*)rarh,rar[0],rar[1],rar[2],rar[3],rar[4],rar[5],
ra_idx,
RA_template->rnti,
rarh->RAPID,RC.mac[module_idP]->common_channels[CC_id].RA_template[0].preamble_index,
RA_template->timing_offset);
if (opt_enabled) {
trace_pdu(1, dlsch_buffer, input_buffer_length, module_idP, 2, 1,
RC.mac[module_idP]->frame, RC.mac[module_idP]->subframe, 0, 0);
LOG_D(OPT,"[eNB %d][RAPROC] CC_id %d RAR Frame %d trace pdu for rnti %x and rapid %d size %d\n",
module_idP, CC_id, frameP, RA_template->rnti,
rarh->RAPID, input_buffer_length);
}
return(RA_template->rnti);
}
#ifdef Rel14
//------------------------------------------------------------------------------
unsigned short fill_rar_br(eNB_MAC_INST *eNB,
int CC_id,
RA_TEMPLATE *RA_template,
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);
int i;
uint8_t nb,rballoc,reps;
uint8_t mcs,TPC,ULdelay,cqireq;
int input_buffer_length;
AssertFatal(RA_template != 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_template->preamble_index; // Respond to Preamble 0 only for the moment
RA_template->timing_offset /= 16; //T_A = N_TA/16, where N_TA should be on a 30.72Msps
rar[0] = (uint8_t)(RA_template->timing_offset>>(2+4)); // 7 MSBs of timing advance + divide by 4
rar[1] = (uint8_t)(RA_template->timing_offset<<(4-2))&0xf0; // 4 LSBs of timing advance + divide by 4
int N_NB_index;
AssertFatal(1==0,"RAR for BL/CE Still to be finished ...\n");
// Copy the Msg2 narrowband
RA_template->msg34_narrowband = RA_template->msg2_narrowband;
if (ce_level<2) { //CE Level 0,1, CEmodeA
input_buffer_length =6;
N_NB_index = get_numnarrowbandbits(cc->mib->message.dl_Bandwidth);
rar[4] = (uint8_t)(RA_template->rnti>>8);
rar[5] = (uint8_t)(RA_template->rnti&0xff);
//cc->RA_template[ra_idx].timing_offset = 0;
nb = 0;
rballoc = mac_computeRIV(6,1+ce_level,1); // one PRB only for UL Grant in position 1+ce_level within Narrowband
rar[1] |= (rballoc&15)<<(4-N_NB_index); // Hopping = 0 (bit 3), 3 MSBs of rballoc
reps = 4;
mcs = 7;
TPC = 3; // no power increase
ULdelay = 0;
cqireq = 0;
rar[2] |= ((mcs&0x8)>>3); // mcs 10
rar[3] = (((mcs&0x7)<<5)) | ((TPC&7)<<2) | ((ULdelay&1)<<1) | (cqireq&1);
}
else { // CE level 2,3 => CEModeB
input_buffer_length =5;
rar[3] = (uint8_t)(RA_template->rnti>>8);
rar[4] = (uint8_t)(RA_template->rnti&0xff);
}
LOG_D(MAC,"[RAPROC] Frame %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,
*(uint8_t*)rarh,rar[0],rar[1],rar[2],rar[3],rar[4],rar[5],
ce_level,
RA_template->rnti,
rarh->RAPID,RA_template->preamble_index,
RA_template->timing_offset);
if (opt_enabled) {
trace_pdu(1, dlsch_buffer, input_buffer_length, eNB->Mod_id, 2, 1,
eNB->frame, eNB->subframe, 0, 0);
LOG_D(OPT,"[RAPROC] RAR Frame %d trace pdu for rnti %x and rapid %d size %d\n",
frameP, RA_template->rnti,
rarh->RAPID, input_buffer_length);
}
return(RA_template->rnti);
}
#endif
//------------------------------------------------------------------------------
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,"[eNB %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;
}
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