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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 ra_procedures.c
* \brief Routines for UE MAC-layer Random-access procedures (36.321) V8.6 2009-03
* \author R. Knopp and Navid Nikaein
* \date 2011
* \version 0.1
* \company Eurecom
* \email: knopp@eurecom.fr navid.nikaein@eurecom.fr
* \note
* \warning
*/
#include "mac_extern.h"
#include "mac.h"
#include "mac_proto.h"
#include "common/utils/LOG/vcd_signal_dumper.h"
#include "PHY_INTERFACE/phy_interface_extern.h"
#include "SCHED_UE/sched_UE.h"
#include "COMMON/mac_rrc_primitives.h"
#include "RRC/LTE/rrc_extern.h"
#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
#include "common/utils/LOG/log.h"
#include "nfapi/oai_integration/vendor_ext.h"
#include "UTIL/OPT/opt.h"
#include "OCG.h"
#include "OCG_extern.h"
#include "SIMULATION/TOOLS/sim.h" // for taus
#include "PHY/LTE_TRANSPORT/transport_common_proto.h"
#include "PHY/LTE_ESTIMATION/lte_estimation.h"
extern UE_MODE_t get_ue_mode(uint8_t Mod_id,uint8_t CC_id,uint8_t eNB_index);
/// This routine implements Section 5.1.2 (UE Random Access Resource Selection) from 36.321
void
get_prach_resources(module_id_t module_idP,
int CC_id,
uint8_t eNB_index,
uint8_t t_id,
uint8_t first_Msg3,
LTE_RACH_ConfigDedicated_t *rach_ConfigDedicated) {
uint8_t Msg3_size = UE_mac_inst[module_idP].RA_Msg3_size;
PRACH_RESOURCES_t *prach_resources =
&UE_mac_inst[module_idP].RA_prach_resources;
LTE_RACH_ConfigCommon_t *rach_ConfigCommon = NULL;
uint8_t noGroupB = 0;
uint8_t f_id = 0, num_prach = 0;
int numberOfRA_Preambles;
int messageSizeGroupA;
int sizeOfRA_PreamblesGroupA;
int messagePowerOffsetGroupB;
int PLThreshold;
AssertFatal(CC_id == 0,
"Transmission on secondary CCs is not supported yet\n");
AssertFatal(UE_mac_inst[module_idP].radioResourceConfigCommon != NULL,
"[UE %d] FATAL radioResourceConfigCommon is NULL !!!\n",
module_idP);
rach_ConfigCommon =
&UE_mac_inst[module_idP].radioResourceConfigCommon->
rach_ConfigCommon;
numberOfRA_Preambles =
(1 + rach_ConfigCommon->preambleInfo.numberOfRA_Preambles) << 2;
if (rach_ConfigDedicated) { // This is for network controlled Mobility, later
if (rach_ConfigDedicated->ra_PRACH_MaskIndex != 0) {
prach_resources->ra_PreambleIndex =
rach_ConfigDedicated->ra_PreambleIndex;
prach_resources->ra_RACH_MaskIndex =
rach_ConfigDedicated->ra_PRACH_MaskIndex;
return;
}
}
/* TODO: gcc warns if this variable is not always set, let's put -1 for no more warning */
messageSizeGroupA = -1;
if (!rach_ConfigCommon->preambleInfo.preamblesGroupAConfig) {
noGroupB = 1;
} else {
sizeOfRA_PreamblesGroupA =
(rach_ConfigCommon->preambleInfo.
preamblesGroupAConfig->sizeOfRA_PreamblesGroupA + 1) << 2;
switch (rach_ConfigCommon->preambleInfo.
preamblesGroupAConfig->messageSizeGroupA) {
case 0:
messageSizeGroupA = 56;
break;
case 1:
messageSizeGroupA = 144;
break;
case 2:
messageSizeGroupA = 208;
break;
case 3:
messageSizeGroupA = 256;
break;
}
/* TODO: what value to use as default? */
messagePowerOffsetGroupB = -9999;
switch (rach_ConfigCommon->preambleInfo.
preamblesGroupAConfig->messagePowerOffsetGroupB) {
case 0:
messagePowerOffsetGroupB = -9999;
break;
case 1:
messagePowerOffsetGroupB = 0;
break;
case 2:
messagePowerOffsetGroupB = 5;
break;
case 3:
messagePowerOffsetGroupB = 8;
break;
case 4:
messagePowerOffsetGroupB = 10;
break;
case 5:
messagePowerOffsetGroupB = 12;
break;
case 6:
messagePowerOffsetGroupB = 15;
break;
case 7:
messagePowerOffsetGroupB = 18;
break;
}
PLThreshold =
0 - get_DELTA_PREAMBLE(module_idP,
CC_id) -
get_Po_NOMINAL_PUSCH(module_idP,
CC_id) - messagePowerOffsetGroupB;
// Note Pcmax is set to 0 here, we have to fix this
if (sizeOfRA_PreamblesGroupA == numberOfRA_Preambles) {
noGroupB = 1;
}
}
if (first_Msg3 == 1) {
if (noGroupB == 1) {
// use Group A procedure
UE_mac_inst[module_idP].RA_prach_resources.ra_PreambleIndex =
(taus()) % numberOfRA_Preambles;
UE_mac_inst[module_idP].RA_prach_resources.ra_RACH_MaskIndex =
0;
UE_mac_inst[module_idP].RA_usedGroupA = 1;
} else if ((Msg3_size < messageSizeGroupA) ||
(get_PL(module_idP, 0, eNB_index) > PLThreshold)) {
// use Group A procedure
UE_mac_inst[module_idP].RA_prach_resources.ra_PreambleIndex =
(taus()) % sizeOfRA_PreamblesGroupA;
UE_mac_inst[module_idP].RA_prach_resources.ra_RACH_MaskIndex =
0;
UE_mac_inst[module_idP].RA_usedGroupA = 1;
} else { // use Group B
UE_mac_inst[module_idP].RA_prach_resources.ra_PreambleIndex =
sizeOfRA_PreamblesGroupA +
(taus()) % (numberOfRA_Preambles -
sizeOfRA_PreamblesGroupA);
UE_mac_inst[module_idP].RA_prach_resources.ra_RACH_MaskIndex =
0;
UE_mac_inst[module_idP].RA_usedGroupA = 0;
}
UE_mac_inst[module_idP].
RA_prach_resources.ra_PREAMBLE_RECEIVED_TARGET_POWER =
get_Po_NOMINAL_PUSCH(module_idP, CC_id);
} else { // Msg3 is being retransmitted
if (UE_mac_inst[module_idP].RA_usedGroupA == 1) {
if (rach_ConfigCommon->preambleInfo.preamblesGroupAConfig) {
UE_mac_inst[module_idP].RA_prach_resources.
ra_PreambleIndex =
(taus()) %
rach_ConfigCommon->preambleInfo.
preamblesGroupAConfig->sizeOfRA_PreamblesGroupA;
} else {
UE_mac_inst[module_idP].RA_prach_resources.
ra_PreambleIndex = (taus()) & 0x3f;
}
UE_mac_inst[module_idP].RA_prach_resources.ra_RACH_MaskIndex =
0;
} else {
// FIXME rach_ConfigCommon->preambleInfo.preamblesGroupAConfig may be zero
UE_mac_inst[module_idP].RA_prach_resources.ra_PreambleIndex =
rach_ConfigCommon->preambleInfo.
preamblesGroupAConfig->sizeOfRA_PreamblesGroupA +
(taus()) %
(rach_ConfigCommon->preambleInfo.numberOfRA_Preambles -
rach_ConfigCommon->preambleInfo.
preamblesGroupAConfig->sizeOfRA_PreamblesGroupA);
UE_mac_inst[module_idP].RA_prach_resources.ra_RACH_MaskIndex =
0;
}
}
// choose random PRACH resource in TDD
if (UE_mac_inst[module_idP].tdd_Config) {
num_prach = get_num_prach_tdd(module_idP);
if ((num_prach > 0) && (num_prach < 6)) {
UE_mac_inst[module_idP].RA_prach_resources.ra_TDD_map_index =
(taus() % num_prach);
}
f_id = get_fid_prach_tdd(module_idP,
UE_mac_inst
[module_idP].RA_prach_resources.
ra_TDD_map_index);
}
// choose RA-RNTI
UE_mac_inst[module_idP].RA_prach_resources.ra_RNTI =
1 + t_id + 10 * f_id;
}
void
Msg1_transmitted(module_id_t module_idP, uint8_t CC_id,
frame_t frameP, uint8_t eNB_id) {
AssertFatal(CC_id == 0,
"Transmission on secondary CCs is not supported yet\n");
// start contention resolution timer
UE_mac_inst[module_idP].RA_attempt_number++;
trace_pdu(DIRECTION_UPLINK, NULL, 0, module_idP, WS_NO_RNTI,
UE_mac_inst[module_idP].RA_prach_resources.
ra_PreambleIndex, UE_mac_inst[module_idP].txFrame,
UE_mac_inst[module_idP].txSubframe, 0,
UE_mac_inst[module_idP].RA_attempt_number);
}
void
Msg3_transmitted(module_id_t module_idP, uint8_t CC_id,
frame_t frameP, uint8_t eNB_id) {
AssertFatal(CC_id == 0,
"Transmission on secondary CCs is not supported yet\n");
// start contention resolution timer
LOG_D(MAC,
"[UE %d][RAPROC] Frame %d : Msg3_tx: Setting contention resolution timer\n",
module_idP, frameP);
UE_mac_inst[module_idP].RA_contention_resolution_cnt = 0;
UE_mac_inst[module_idP].RA_contention_resolution_timer_active = 1;
trace_pdu(DIRECTION_UPLINK, &UE_mac_inst[module_idP].CCCH_pdu.payload[0],
UE_mac_inst[module_idP].RA_Msg3_size, module_idP, WS_C_RNTI,
UE_mac_inst[module_idP].crnti,
UE_mac_inst[module_idP].txFrame,
UE_mac_inst[module_idP].txSubframe, 0, 0);
}
PRACH_RESOURCES_t *ue_get_rach(module_id_t module_idP, int CC_id,
frame_t frameP, uint8_t eNB_indexP,
sub_frame_t subframeP) {
uint8_t Size = 0;
UE_MODE_t UE_mode;
// Modification for phy_stub_ue operation
if(NFAPI_MODE == NFAPI_UE_STUB_PNF) { // phy_stub_ue mode
UE_mode = UE_mac_inst[module_idP].UE_mode[0];
LOG_D(MAC, "ue_get_rach , UE_mode: %d", UE_mode);
} else { // Full stack mode
UE_mode = get_ue_mode(module_idP,0,eNB_indexP);
}
uint8_t lcid = CCCH;
uint16_t Size16;
struct LTE_RACH_ConfigCommon *rach_ConfigCommon =
(struct LTE_RACH_ConfigCommon *) NULL;
int32_t frame_diff = 0;
uint8_t dcch_header_len = 0;
uint16_t sdu_lengths;
uint8_t ulsch_buff[MAX_ULSCH_PAYLOAD_BYTES];
AssertFatal(CC_id == 0,
"Transmission on secondary CCs is not supported yet\n");
if (UE_mode == PRACH) {
LOG_D(MAC, "ue_get_rach 3, RA_active value: %d", UE_mac_inst[module_idP].RA_active);
if (UE_mac_inst[module_idP].radioResourceConfigCommon) {
rach_ConfigCommon =
&UE_mac_inst[module_idP].
radioResourceConfigCommon->rach_ConfigCommon;
} else {
return (NULL);
}
if (UE_mac_inst[module_idP].RA_active == 0) {
LOG_I(MAC, "RA not active\n");
// check if RRC is ready to initiate the RA procedure
Size = mac_rrc_data_req_ue(module_idP,
CC_id,
frameP,
CCCH, 1,
&UE_mac_inst[module_idP].
CCCH_pdu.payload[sizeof
(SCH_SUBHEADER_SHORT)
+ 1], eNB_indexP,
0);
Size16 = (uint16_t) Size;
// LOG_D(MAC,"[UE %d] Frame %d: Requested RRCConnectionRequest, got %d bytes\n",module_idP,frameP,Size);
LOG_I(RRC,
"[MSC_MSG][FRAME %05d][RRC_UE][MOD %02d][][--- MAC_DATA_REQ (RRCConnectionRequest eNB %d) --->][MAC_UE][MOD %02d][]\n",
frameP, module_idP, eNB_indexP, module_idP);
LOG_I(MAC,
"[UE %d] Frame %d: Requested RRCConnectionRequest, got %d bytes\n",
module_idP, frameP, Size);
if (Size > 0) {
UE_mac_inst[module_idP].RA_active = 1;
UE_mac_inst[module_idP].RA_PREAMBLE_TRANSMISSION_COUNTER =
1;
UE_mac_inst[module_idP].RA_Msg3_size =
Size + sizeof(SCH_SUBHEADER_SHORT) +
sizeof(SCH_SUBHEADER_SHORT);
UE_mac_inst[module_idP].RA_prachMaskIndex = 0;
UE_mac_inst[module_idP].RA_prach_resources.Msg3 =
UE_mac_inst[module_idP].CCCH_pdu.payload;
UE_mac_inst[module_idP].RA_backoff_cnt = 0; // add the backoff condition here if we have it from a previous RA reponse which failed (i.e. backoff indicator)
AssertFatal(rach_ConfigCommon != NULL,
"[UE %d] FATAL Frame %d: rach_ConfigCommon is NULL !!!\n",
module_idP, frameP);
UE_mac_inst[module_idP].RA_window_cnt =
2 +
rach_ConfigCommon->ra_SupervisionInfo.
ra_ResponseWindowSize;
if (UE_mac_inst[module_idP].RA_window_cnt == 9) {
UE_mac_inst[module_idP].RA_window_cnt = 10; // Note: 9 subframe window doesn't exist, after 8 is 10!
}
UE_mac_inst[module_idP].RA_tx_frame = frameP;
UE_mac_inst[module_idP].RA_tx_subframe = subframeP;
UE_mac_inst[module_idP].RA_backoff_frame = frameP;
UE_mac_inst[module_idP].RA_backoff_subframe = subframeP;
// Fill in preamble and PRACH resource
get_prach_resources(module_idP, CC_id, eNB_indexP,
subframeP, 1, NULL);
generate_ulsch_header((uint8_t *) & UE_mac_inst[module_idP].CCCH_pdu.payload[0], // mac header
1, // num sdus
0, // short pading
&Size16, // sdu length
&lcid, // sdu lcid
NULL, // power headroom
NULL, // crnti
NULL, // truncated bsr
NULL, // short bsr
NULL, // long_bsr
1); //post_padding
return (&UE_mac_inst[module_idP].RA_prach_resources);
} else if (UE_mac_inst[module_idP].
scheduling_info.BSR_bytes[UE_mac_inst[module_idP].
scheduling_info.LCGID
[DCCH]] > 0) {
// This is for triggering a transmission on DCCH using PRACH (during handover, or sending SR for example)
dcch_header_len = 2 + 2; /// SHORT Subheader + C-RNTI control element
LOG_USEDINLOG_VAR(mac_rlc_status_resp_t,rlc_status)=mac_rlc_status_ind(module_idP,
UE_mac_inst[module_idP].crnti,
eNB_indexP, frameP, subframeP,
ENB_FLAG_NO, MBMS_FLAG_NO, DCCH, 6
#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
,0, 0
#endif
);
if (UE_mac_inst[module_idP].crnti_before_ho)
LOG_D(MAC,
"[UE %d] Frame %d : UL-DCCH -> ULSCH, HO RRCConnectionReconfigurationComplete (%x, %x), RRC message has %d bytes to send throug PRACH (mac header len %d)\n",
module_idP, frameP,
UE_mac_inst[module_idP].crnti,
UE_mac_inst[module_idP].crnti_before_ho,
rlc_status.bytes_in_buffer, dcch_header_len);
else
LOG_D(MAC,
"[UE %d] Frame %d : UL-DCCH -> ULSCH, RRC message has %d bytes to send through PRACH(mac header len %d)\n",
module_idP, frameP, rlc_status.bytes_in_buffer,
dcch_header_len);
sdu_lengths = mac_rlc_data_req(module_idP, UE_mac_inst[module_idP].crnti, eNB_indexP, frameP, ENB_FLAG_NO, MBMS_FLAG_NO, DCCH, 6, //not used
(char *) &ulsch_buff[0]
#if (LTE_RRC_VERSION >= MAKE_VERSION(14, 0, 0))
,0,
0
#endif
);
if(sdu_lengths > 0)
LOG_D(MAC, "[UE %d] TX Got %d bytes for DCCH\n",
module_idP, sdu_lengths);
else
LOG_E(MAC, "[UE %d] TX DCCH error\n",
module_idP );
update_bsr(module_idP, frameP, subframeP, eNB_indexP);
UE_mac_inst[module_idP].
scheduling_info.BSR[UE_mac_inst[module_idP].
scheduling_info.LCGID[DCCH]] =
locate_BsrIndexByBufferSize(BSR_TABLE, BSR_TABLE_SIZE,
UE_mac_inst
[module_idP].scheduling_info.BSR_bytes
[UE_mac_inst
[module_idP].scheduling_info.LCGID
[DCCH]]);
//TO DO: fill BSR infos in UL TBS
//header_len +=2;
UE_mac_inst[module_idP].RA_active = 1;
UE_mac_inst[module_idP].RA_PREAMBLE_TRANSMISSION_COUNTER =
1;
UE_mac_inst[module_idP].RA_Msg3_size =
Size + dcch_header_len;
UE_mac_inst[module_idP].RA_prachMaskIndex = 0;
UE_mac_inst[module_idP].RA_prach_resources.Msg3 =
ulsch_buff;
UE_mac_inst[module_idP].RA_backoff_cnt = 0; // add the backoff condition here if we have it from a previous RA reponse which failed (i.e. backoff indicator)
AssertFatal(rach_ConfigCommon != NULL,
"[UE %d] FATAL Frame %d: rach_ConfigCommon is NULL !!!\n",
module_idP, frameP);
UE_mac_inst[module_idP].RA_window_cnt =
2 +
rach_ConfigCommon->ra_SupervisionInfo.
ra_ResponseWindowSize;
if (UE_mac_inst[module_idP].RA_window_cnt == 9) {
UE_mac_inst[module_idP].RA_window_cnt = 10; // Note: 9 subframe window doesn't exist, after 8 is 10!
}
UE_mac_inst[module_idP].RA_tx_frame = frameP;
UE_mac_inst[module_idP].RA_tx_subframe = subframeP;
UE_mac_inst[module_idP].RA_backoff_frame = frameP;
UE_mac_inst[module_idP].RA_backoff_subframe = subframeP;
// Fill in preamble and PRACH resource
get_prach_resources(module_idP, CC_id, eNB_indexP,
subframeP, 1, NULL);
generate_ulsch_header((uint8_t *) ulsch_buff, // mac header
1, // num sdus
0, // short pading
&Size16, // sdu length
&lcid, // sdu lcid
NULL, // power headroom
&UE_mac_inst[module_idP].crnti, // crnti
NULL, // truncated bsr
NULL, // short bsr
NULL, // long_bsr
0); //post_padding
return (&UE_mac_inst[module_idP].RA_prach_resources);
}
} else { // RACH is active
LOG_D(MAC,
"[MAC][UE %d][RAPROC] frameP %d, subframe %d: RA Active, window cnt %d (RA_tx_frame %d, RA_tx_subframe %d)\n",
module_idP, frameP, subframeP,
UE_mac_inst[module_idP].RA_window_cnt,
UE_mac_inst[module_idP].RA_tx_frame,
UE_mac_inst[module_idP].RA_tx_subframe);
// compute backoff parameters
if (UE_mac_inst[module_idP].RA_backoff_cnt > 0) {
frame_diff =
(sframe_t) frameP -
UE_mac_inst[module_idP].RA_backoff_frame;
if (frame_diff < 0) {
frame_diff = -frame_diff;
}
UE_mac_inst[module_idP].RA_backoff_cnt -=
((10 * frame_diff) +
(subframeP -
UE_mac_inst[module_idP].RA_backoff_subframe));
UE_mac_inst[module_idP].RA_backoff_frame = frameP;
UE_mac_inst[module_idP].RA_backoff_subframe = subframeP;
}
// compute RA window parameters
if (UE_mac_inst[module_idP].RA_window_cnt > 0) {
frame_diff =
(frame_t) frameP - UE_mac_inst[module_idP].RA_tx_frame;
if (frame_diff < 0) {
frame_diff = -frame_diff;
}
UE_mac_inst[module_idP].RA_window_cnt -=
((10 * frame_diff) +
(subframeP - UE_mac_inst[module_idP].RA_tx_subframe));
LOG_D(MAC,
"[MAC][UE %d][RAPROC] frameP %d, subframe %d: RA Active, adjusted window cnt %d\n",
module_idP, frameP, subframeP,
UE_mac_inst[module_idP].RA_window_cnt);
}
if ((UE_mac_inst[module_idP].RA_window_cnt <= 0) &&
(UE_mac_inst[module_idP].RA_backoff_cnt <= 0)) {
UE_mac_inst[module_idP].RA_tx_frame = frameP;
UE_mac_inst[module_idP].RA_tx_subframe = subframeP;
UE_mac_inst[module_idP].RA_PREAMBLE_TRANSMISSION_COUNTER++;
UE_mac_inst[module_idP].RA_prach_resources.ra_PREAMBLE_RECEIVED_TARGET_POWER += (rach_ConfigCommon->powerRampingParameters.powerRampingStep << 1); // 2dB increments in ASN.1 definition
int preambleTransMax = -1;
switch (rach_ConfigCommon->ra_SupervisionInfo.
preambleTransMax) {
case LTE_PreambleTransMax_n3:
preambleTransMax = 3;
break;
case LTE_PreambleTransMax_n4:
preambleTransMax = 4;
break;
case LTE_PreambleTransMax_n5:
preambleTransMax = 5;
break;
case LTE_PreambleTransMax_n6:
preambleTransMax = 6;
break;
case LTE_PreambleTransMax_n7:
preambleTransMax = 7;
break;
case LTE_PreambleTransMax_n8:
preambleTransMax = 8;
break;
case LTE_PreambleTransMax_n10:
preambleTransMax = 10;
break;
case LTE_PreambleTransMax_n20:
preambleTransMax = 20;
break;
case LTE_PreambleTransMax_n50:
preambleTransMax = 50;
break;
case LTE_PreambleTransMax_n100:
preambleTransMax = 100;
break;
case LTE_PreambleTransMax_n200:
preambleTransMax = 200;
break;
}
if (UE_mac_inst[module_idP].
RA_PREAMBLE_TRANSMISSION_COUNTER == preambleTransMax) {
LOG_D(MAC,
"[UE %d] Frame %d: Maximum number of RACH attempts (%d)\n",
module_idP, frameP, preambleTransMax);
// send message to RRC
UE_mac_inst[module_idP].
RA_PREAMBLE_TRANSMISSION_COUNTER = 1;
UE_mac_inst[module_idP].
RA_prach_resources.ra_PREAMBLE_RECEIVED_TARGET_POWER
= get_Po_NOMINAL_PUSCH(module_idP, CC_id);
}
UE_mac_inst[module_idP].RA_window_cnt =
2 +
rach_ConfigCommon->ra_SupervisionInfo.
ra_ResponseWindowSize;
UE_mac_inst[module_idP].RA_backoff_cnt = 0;
// Fill in preamble and PRACH resource
get_prach_resources(module_idP, CC_id, eNB_indexP,
subframeP, 0, NULL);
return (&UE_mac_inst[module_idP].RA_prach_resources);
}
}
} else if (UE_mode == PUSCH) {
LOG_D(MAC,
"[UE %d] FATAL: Should not have checked for RACH in PUSCH yet ...",
module_idP);
AssertFatal(1 == 0, "");
}
return (NULL);
}