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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 gNB_scheduler_ulsch.c
* \brief gNB procedures for the ULSCH transport channel
* \author Navid Nikaein and Raymond Knopp, Guido Casati
* \date 2019
* \email: guido.casati@iis.fraunhofer.de
* \version 1.0
* @ingroup _mac
*/
#include "LAYER2/NR_MAC_gNB/mac_proto.h"
#include "executables/softmodem-common.h"
//#define ENABLE_MAC_PAYLOAD_DEBUG 1
void nr_process_mac_pdu(
module_id_t module_idP,
rnti_t rnti,
uint8_t CC_id,
frame_t frameP,
uint8_t *pduP,
uint16_t mac_pdu_len)
{
// This function is adapting code from the old
// parse_header(...) and ue_send_sdu(...) functions of OAI LTE
uint8_t *pdu_ptr = pduP, rx_lcid, done = 0;
int pdu_len = mac_pdu_len;
uint16_t mac_ce_len, mac_subheader_len, mac_sdu_len;
// For both DL/UL-SCH
// Except:
// - UL/DL-SCH: fixed-size MAC CE(known by LCID)
// - UL/DL-SCH: padding
// - UL-SCH: MSG3 48-bits
// |0|1|2|3|4|5|6|7| bit-wise
// |R|F| LCID |
// | L |
// |0|1|2|3|4|5|6|7| bit-wise
// |R|F| LCID |
// | L |
// | L |
// For both DL/UL-SCH
// For:
// - UL/DL-SCH: fixed-size MAC CE(known by LCID)
// - UL/DL-SCH: padding, for single/multiple 1-oct padding CE(s)
// - UL-SCH: MSG3 48-bits
// |0|1|2|3|4|5|6|7| bit-wise
// |R|R| LCID |
// LCID: The Logical Channel ID field identifies the logical channel instance of the corresponding MAC SDU or the type of the corresponding MAC CE or padding as described in Tables 6.2.1-1 and 6.2.1-2 for the DL-SCH and UL-SCH respectively. There is one LCID field per MAC subheader. The LCID field size is 6 bits;
// L: The Length field indicates the length of the corresponding MAC SDU or variable-sized MAC CE in bytes. There is one L field per MAC subheader except for subheaders corresponding to fixed-sized MAC CEs and padding. The size of the L field is indicated by the F field;
// F: lenght of L is 0:8 or 1:16 bits wide
// R: Reserved bit, set to zero.
while (!done && pdu_len > 0){
mac_ce_len = 0;
mac_subheader_len = 1; // default to fixed-length subheader = 1-oct
mac_sdu_len = 0;
rx_lcid = ((NR_MAC_SUBHEADER_FIXED *)pdu_ptr)->LCID;
LOG_D(MAC, "LCID received at gNB side: %d \n", rx_lcid);
switch(rx_lcid){
// MAC CE
/*#ifdef DEBUG_HEADER_PARSING
LOG_D(MAC, "[UE] LCID %d, PDU length %d\n", ((NR_MAC_SUBHEADER_FIXED *)pdu_ptr)->LCID, pdu_len);
#endif*/
case UL_SCH_LCID_RECOMMENDED_BITRATE_QUERY:
// 38.321 Ch6.1.3.20
mac_ce_len = 2;
break;
case UL_SCH_LCID_CONFIGURED_GRANT_CONFIRMATION:
// 38.321 Ch6.1.3.7
break;
case UL_SCH_LCID_S_BSR:
//38.321 section 6.1.3.1
//fixed length
mac_ce_len =1;
/* Extract short BSR value */
break;
case UL_SCH_LCID_S_TRUNCATED_BSR:
//38.321 section 6.1.3.1
//fixed length
mac_ce_len =1;
/* Extract short truncated BSR value */
break;
case UL_SCH_LCID_L_BSR:
//38.321 section 6.1.3.1
//variable length
mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
mac_subheader_len = 2;
if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
mac_subheader_len = 3;
}
/* Extract long BSR value */
break;
case UL_SCH_LCID_L_TRUNCATED_BSR:
//38.321 section 6.1.3.1
//variable length
mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
mac_subheader_len = 2;
if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
mac_subheader_len = 3;
}
/* Extract long truncated BSR value */
break;
case UL_SCH_LCID_C_RNTI:
//38.321 section 6.1.3.2
//fixed length
mac_ce_len = 2;
/* Extract CRNTI value */
break;
case UL_SCH_LCID_SINGLE_ENTRY_PHR:
//38.321 section 6.1.3.8
//fixed length
mac_ce_len = 2;
/* Extract SINGLE ENTRY PHR elements for PHR calculation */
break;
case UL_SCH_LCID_MULTI_ENTRY_PHR_1_OCT:
//38.321 section 6.1.3.9
// varialbe length
mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
mac_subheader_len = 2;
if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
mac_subheader_len = 3;
}
/* Extract MULTI ENTRY PHR elements from single octet bitmap for PHR calculation */
break;
case UL_SCH_LCID_MULTI_ENTRY_PHR_4_OCT:
//38.321 section 6.1.3.9
// varialbe length
mac_ce_len |= (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
mac_subheader_len = 2;
if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
mac_ce_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
mac_subheader_len = 3;
}
/* Extract MULTI ENTRY PHR elements from four octets bitmap for PHR calculation */
break;
case UL_SCH_LCID_PADDING:
done = 1;
// end of MAC PDU, can ignore the rest.
break;
// MAC SDUs
case UL_SCH_LCID_SRB1:
// todo
break;
case UL_SCH_LCID_SRB2:
// todo
break;
case UL_SCH_LCID_SRB3:
// todo
break;
case UL_SCH_LCID_CCCH_MSG3:
// todo
break;
case UL_SCH_LCID_CCCH:
// todo
mac_subheader_len = 2;
break;
case UL_SCH_LCID_DTCH:
// check if LCID is valid at current time.
if(((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->F){
//mac_sdu_len |= (uint16_t)(((NR_MAC_SUBHEADER_LONG *)pdu_ptr)->L2)<<8;
mac_subheader_len = 3;
mac_sdu_len = ((uint16_t)(((NR_MAC_SUBHEADER_LONG *) pdu_ptr)->L1 & 0x7f) << 8)
| ((uint16_t)((NR_MAC_SUBHEADER_LONG *) pdu_ptr)->L2 & 0xff);
} else {
mac_sdu_len = (uint16_t)((NR_MAC_SUBHEADER_SHORT *)pdu_ptr)->L;
mac_subheader_len = 2;
}
LOG_D(MAC, "[UE %d] Frame %d : ULSCH -> UL-DTCH %d (gNB %d, %d bytes)\n", module_idP, frameP, rx_lcid, module_idP, mac_sdu_len);
int UE_id = find_nr_UE_id(module_idP, rnti);
RC.nrmac[module_idP]->UE_info.mac_stats[UE_id].lc_bytes_rx[rx_lcid] += mac_sdu_len;
#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
LOG_T(MAC, "[UE %d] First 32 bytes of DLSCH : \n", module_idP);
for (i = 0; i < 32; i++)
LOG_T(MAC, "%x.", (pdu_ptr + mac_subheader_len)[i]);
LOG_T(MAC, "\n");
#endif
if(IS_SOFTMODEM_NOS1){
mac_rlc_data_ind(module_idP,
0x1234,
module_idP,
frameP,
ENB_FLAG_YES,
MBMS_FLAG_NO,
rx_lcid,
(char *) (pdu_ptr + mac_subheader_len),
mac_sdu_len,
1,
NULL);
}
else{
mac_rlc_data_ind(module_idP,
rnti,
module_idP,
frameP,
ENB_FLAG_YES,
MBMS_FLAG_NO,
rx_lcid,
(char *) (pdu_ptr + mac_subheader_len),
mac_sdu_len,
1,
NULL);
}
break;
default:
return;
break;
}
pdu_ptr += ( mac_subheader_len + mac_ce_len + mac_sdu_len );
pdu_len -= ( mac_subheader_len + mac_ce_len + mac_sdu_len );
if (pdu_len < 0) {
LOG_E(MAC, "%s() residual mac pdu length < 0!, pdu_len: %d\n", __func__, pdu_len);
return;
}
}
}
void handle_nr_ul_harq(uint16_t slot, NR_UE_sched_ctrl_t *sched_ctrl, NR_mac_stats_t *stats, nfapi_nr_crc_t crc_pdu) {
int max_harq_rounds = 4; // TODO define macro
uint8_t hrq_id = crc_pdu.harq_id;
NR_UE_ul_harq_t *cur_harq = &sched_ctrl->ul_harq_processes[hrq_id];
if (cur_harq->state==ACTIVE_SCHED) {
if (!crc_pdu.tb_crc_status) {
cur_harq->ndi ^= 1;
cur_harq->round = 0;
cur_harq->state = INACTIVE; // passed -> make inactive. can be used by scheduder for next grant
#ifdef UL_HARQ_PRINT
printf("[HARQ HANDLER] Ulharq id %d crc passed, freeing it for scheduler\n",hrq_id);
#endif
} else {
cur_harq->round++;
cur_harq->state = ACTIVE_NOT_SCHED;
#ifdef UL_HARQ_PRINT
printf("[HARQ HANDLER] Ulharq id %d crc failed, requesting retransmission\n",hrq_id);
#endif
}
if (!(cur_harq->round<max_harq_rounds)) {
cur_harq->ndi ^= 1;
cur_harq->state = INACTIVE; // failed after 4 rounds -> make inactive
cur_harq->round = 0;
LOG_D(MAC,"[HARQ HANDLER] RNTI %x: Ulharq id %d crc failed in all round, freeing it for scheduler\n",crc_pdu.rnti,hrq_id);
stats->ulsch_errors++;
}
return;
} else
LOG_E(MAC,"Incorrect ULSCH HARQ process %d or invalid state %d\n",hrq_id,cur_harq->state);
}
/*
* When data are received on PHY and transmitted to MAC
*/
void nr_rx_sdu(const module_id_t gnb_mod_idP,
const int CC_idP,
const frame_t frameP,
const sub_frame_t slotP,
const rnti_t rntiP,
uint8_t *sduP,
const uint16_t sdu_lenP,
const uint16_t timing_advance,
const uint8_t ul_cqi,
const uint16_t rssi){
int current_rnti = 0, UE_id = -1, harq_pid = 0;
gNB_MAC_INST *gNB_mac = NULL;
NR_UE_info_t *UE_info = NULL;
NR_UE_sched_ctrl_t *UE_scheduling_control = NULL;
current_rnti = rntiP;
UE_id = find_nr_UE_id(gnb_mod_idP, current_rnti);
gNB_mac = RC.nrmac[gnb_mod_idP];
UE_info = &gNB_mac->UE_info;
int target_snrx10 = gNB_mac->pusch_target_snrx10;
if (UE_id != -1) {
UE_scheduling_control = &(UE_info->UE_sched_ctrl[UE_id]);
UE_info->mac_stats[UE_id].ulsch_total_bytes_rx += sdu_lenP;
LOG_D(MAC, "[gNB %d][PUSCH %d] CC_id %d %d.%d Received ULSCH sdu from PHY (rnti %x, UE_id %d) ul_cqi %d\n",
gnb_mod_idP,
harq_pid,
CC_idP,
frameP,
slotP,
current_rnti,
UE_id,
ul_cqi);
// if not missed detection (10dB threshold for now)
if (UE_scheduling_control->ul_rssi < (100+rssi)) {
UE_scheduling_control->tpc0 = nr_get_tpc(target_snrx10,ul_cqi,30);
UE_scheduling_control->ta_update = timing_advance;
UE_scheduling_control->ul_rssi = rssi;
LOG_D(MAC, "[UE %d] PUSCH TPC %d and TA %d\n",UE_id,UE_scheduling_control->tpc0,UE_scheduling_control->ta_update);
}
else{
UE_scheduling_control->tpc0 = 1;
}
#if defined(ENABLE_MAC_PAYLOAD_DEBUG)
LOG_I(MAC, "Printing received UL MAC payload at gNB side: %d \n");
for (int i = 0; i < sdu_lenP ; i++) {
//harq_process_ul_ue->a[i] = (unsigned char) rand();
//printf("a[%d]=0x%02x\n",i,harq_process_ul_ue->a[i]);
printf("%02x ",(unsigned char)sduP[i]);
}
printf("\n");
#endif
if (sduP != NULL){
LOG_D(MAC, "Received PDU at MAC gNB \n");
nr_process_mac_pdu(gnb_mod_idP, current_rnti, CC_idP, frameP, sduP, sdu_lenP);
}
else {
}
}
else if (sduP != NULL) { // if the CRC passed
// random access pusch with TC-RNTI
NR_RA_t *ra = &gNB_mac->common_channels[CC_idP].ra[0];
if (ra->state != WAIT_Msg3) {
LOG_E(MAC,
"expected RA state WAIT_Msg3/%d (but is %d) for RA-RNTI %04x\n",
WAIT_Msg3,
ra->state,
ra->rnti);
return;
}
if (ra->rnti != current_rnti) {
LOG_E(MAC,
"expected RA-RNTI %04x (C-RNTI %04x) to match current RNTI %04x\n",
ra->rnti,
ra->crnti,
current_rnti);
return;
}
free(ra->preambles.preamble_list);
ra->state = RA_IDLE;
LOG_I(MAC, "reset RA state information for RA-RNTI %04x\n", ra->rnti);
const int UE_id = add_new_nr_ue(gnb_mod_idP, ra->crnti);
UE_info->secondaryCellGroup[UE_id] = ra->secondaryCellGroup;
struct NR_ServingCellConfig__downlinkBWP_ToAddModList *bwpList =
ra->secondaryCellGroup->spCellConfig->spCellConfigDedicated->downlinkBWP_ToAddModList;
AssertFatal(bwpList->list.count == 1,
"downlinkBWP_ToAddModList has %d BWP!\n",
bwpList->list.count);
const int bwp_id = 1;
UE_info->UE_sched_ctrl[UE_id].active_bwp = bwpList->list.array[bwp_id - 1];
LOG_W(MAC,
"[gNB %d][RAPROC] PUSCH with TC_RNTI %x received correctly, "
"adding UE MAC Context UE_id %d/RNTI %04x\n",
gnb_mod_idP,
current_rnti,
UE_id,
ra->crnti);
}
}