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openairinterface5g/openair2/LAYER2/NR_MAC_gNB/main.c
T
Robert Schmidt 7a298e73cd Repair reestablishment and make it work via F1 
This commit repairs the reestablishment after the introduction of the CU
UE ID in the CU, different from the DU UE ID. Now, the CU uses an
identifier different from the RNTI, used in the MAC, to refer to UEs.

To repair the reestablishment, a number of changes needed to be
introduced:

- Handle old_gNB_DU_UE_id in MAC

The MAC handles the old_gNB_DU_UE_id field in the DL RRC Message. The
commit adds encoding/decoding of the field. The MAC will drop the old
UE, but retain the CellGroup of the corresponding UE(!). Because a UE
releases the spCellGroup on reestablishment, the MAC does the same; it
needs to reapply the old configuration after a reconfiguration. For the
latter, introduce new variables to keep a "future" CellGroupConfig to be
applied (reconfigCellGroup) and a flag (expect_reconfiguration) that
applies the CellGroupConfig if a DL RRC Message transfer on DCCH, which
is assumed to be the reconfiguration.

- Add RNTI change in RLC

The RLC needs to reuse the old UE context. Hence, we simply change the
RNTI in the old context, and delete the new one.

- No PDCP UE ID change

The previous implementation of the PDCP used the RNTI; hence, the ID
needed to be switch (as above for the RLC). Since the PDCP now also uses
the CU UE ID, no identifier change is needed, and we remove all
corresponding code.

- No MAC modifications/update from CU

As foreseen by the spec, the CU does not modify or change the
cellGroupConfig in the RRC during reestablishment. This change will be
generalized in the future to all of the RRC.  Also, the
nr_rrc_mac_remove_ue() function has been removed: the MAC handles any UE
changes autonomeously, without being triggered from the RRC explicitly.

- Remove reestablish_rnti_map

The RRC does not use RNTIs for UE identification. Hence, a
reestablish_rnti_map to link two UEs to each other is not necessary
anymore.
2023-08-12 11:48:17 +02:00

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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 main.c
* \brief top init of Layer 2
* \author Navid Nikaein and Raymond Knopp, WEI-TAI CHEN
* \date 2010 - 2014, 2018
* \version 1.0
* \company Eurecom, NTUST
* \email: navid.nikaein@eurecom.fr, kroempa@gmail.com
* @ingroup _mac
*/
#include "NR_MAC_gNB/mac_proto.h"
#include "NR_MAC_COMMON/nr_mac_extern.h"
#include "assertions.h"
#include "nr_pdcp/nr_pdcp_oai_api.h"
#include "RRC/NR/nr_rrc_defs.h"
#include "common/utils/LOG/log.h"
#include "nr_rlc/nr_rlc_oai_api.h"
#include "RRC/NR/MESSAGES/asn1_msg.h"
//#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
#include "openair2/F1AP/f1ap_ids.h"
#include "common/ran_context.h"
#include "executables/softmodem-common.h"
extern RAN_CONTEXT_t RC;
#define MACSTATSSTRLEN 16000
void *nrmac_stats_thread(void *arg) {
gNB_MAC_INST *gNB = (gNB_MAC_INST *)arg;
char output[MACSTATSSTRLEN] = {0};
const char *end = output + MACSTATSSTRLEN;
FILE *file = fopen("nrMAC_stats.log","w");
AssertFatal(file!=NULL,"Cannot open nrMAC_stats.log, error %s\n",strerror(errno));
while (oai_exit == 0) {
char *p = output;
NR_SCHED_LOCK(&gNB->sched_lock);
p += dump_mac_stats(gNB, p, end - p, false);
NR_SCHED_UNLOCK(&gNB->sched_lock);
p += snprintf(p, end - p, "\n");
p += print_meas_log(&gNB->eNB_scheduler, "DL & UL scheduling timing", NULL, NULL, p, end - p);
p += print_meas_log(&gNB->schedule_dlsch, "dlsch scheduler", NULL, NULL, p, end - p);
p += print_meas_log(&gNB->rlc_data_req, "rlc_data_req", NULL, NULL, p, end - p);
p += print_meas_log(&gNB->rlc_status_ind, "rlc_status_ind", NULL, NULL, p, end - p);
fwrite(output, p - output, 1, file);
fflush(file);
sleep(1);
fseek(file,0,SEEK_SET);
}
fclose(file);
return NULL;
}
void clear_mac_stats(gNB_MAC_INST *gNB) {
UE_iterator(gNB->UE_info.list, UE) {
memset(&UE->mac_stats,0,sizeof(UE->mac_stats));
}
}
size_t dump_mac_stats(gNB_MAC_INST *gNB, char *output, size_t strlen, bool reset_rsrp)
{
int num = 1;
const char *begin = output;
const char *end = output + strlen;
/* this function is called from gNB_dlsch_ulsch_scheduler(), so assumes the
* scheduler to be locked*/
NR_SCHED_ENSURE_LOCKED(&gNB->sched_lock);
NR_SCHED_LOCK(&gNB->UE_info.mutex);
UE_iterator(gNB->UE_info.list, UE) {
NR_UE_sched_ctrl_t *sched_ctrl = &UE->UE_sched_ctrl;
NR_mac_stats_t *stats = &UE->mac_stats;
const int avg_rsrp = stats->num_rsrp_meas > 0 ? stats->cumul_rsrp / stats->num_rsrp_meas : 0;
output += snprintf(output,
end - output,
"UE RNTI %04x (%d) PH %d dB PCMAX %d dBm, average RSRP %d (%d meas)\n",
UE->rnti,
num++,
sched_ctrl->ph,
sched_ctrl->pcmax,
avg_rsrp,
stats->num_rsrp_meas);
if(sched_ctrl->CSI_report.cri_ri_li_pmi_cqi_report.print_report)
output += snprintf(output,
end - output,
"UE %04x: CQI %d, RI %d, PMI (%d,%d)\n",
UE->rnti,
sched_ctrl->CSI_report.cri_ri_li_pmi_cqi_report.wb_cqi_1tb,
sched_ctrl->CSI_report.cri_ri_li_pmi_cqi_report.ri+1,
sched_ctrl->CSI_report.cri_ri_li_pmi_cqi_report.pmi_x1,
sched_ctrl->CSI_report.cri_ri_li_pmi_cqi_report.pmi_x2);
if (stats->srs_stats[0] != '\0') {
output += snprintf(output, end - output, "UE %04x: %s\n", UE->rnti, stats->srs_stats);
}
output += snprintf(output,
end - output,
"UE %04x: dlsch_rounds ", UE->rnti);
output += snprintf(output, end - output, "%"PRIu64, stats->dl.rounds[0]);
for (int i = 1; i < gNB->dl_bler.harq_round_max; i++)
output += snprintf(output, end - output, "/%"PRIu64, stats->dl.rounds[i]);
output += snprintf(output,
end - output,
", dlsch_errors %"PRIu64", pucch0_DTX %d, BLER %.5f MCS %d\n",
stats->dl.errors,
stats->pucch0_DTX,
sched_ctrl->dl_bler_stats.bler,
sched_ctrl->dl_bler_stats.mcs);
if (reset_rsrp) {
stats->num_rsrp_meas = 0;
stats->cumul_rsrp = 0;
}
output += snprintf(output,
end - output,
"UE %04x: dlsch_total_bytes %"PRIu64"\n",
UE->rnti, stats->dl.total_bytes);
output += snprintf(output,
end - output,
"UE %04x: ulsch_rounds ", UE->rnti);
output += snprintf(output, end - output, "%"PRIu64, stats->ul.rounds[0]);
for (int i = 1; i < gNB->ul_bler.harq_round_max; i++)
output += snprintf(output, end - output, "/%"PRIu64, stats->ul.rounds[i]);
output += snprintf(output,
end - output,
", ulsch_DTX %d, ulsch_errors %"PRIu64", BLER %.5f MCS %d\n",
stats->ulsch_DTX,
stats->ul.errors,
sched_ctrl->ul_bler_stats.bler,
sched_ctrl->ul_bler_stats.mcs);
output += snprintf(output,
end - output,
"UE %04x: ulsch_total_bytes_scheduled %"PRIu64", ulsch_total_bytes_received %"PRIu64"\n",
UE->rnti,
stats->ulsch_total_bytes_scheduled, stats->ul.total_bytes);
for (int lc_id = 0; lc_id < 63; lc_id++) {
if (stats->dl.lc_bytes[lc_id] > 0)
output += snprintf(output,
end - output,
"UE %04x: LCID %d: %"PRIu64" bytes TX\n",
UE->rnti,
lc_id,
stats->dl.lc_bytes[lc_id]);
if (stats->ul.lc_bytes[lc_id] > 0)
output += snprintf(output,
end - output,
"UE %04x: LCID %d: %"PRIu64" bytes RX\n",
UE->rnti,
lc_id,
stats->ul.lc_bytes[lc_id]);
}
}
NR_SCHED_UNLOCK(&gNB->UE_info.mutex);
return output - begin;
}
static void mac_rrc_init(gNB_MAC_INST *mac, ngran_node_t node_type)
{
switch (node_type) {
case ngran_gNB_CU:
AssertFatal(1 == 0, "nothing to do for CU\n");
break;
case ngran_gNB_DU:
mac_rrc_ul_f1ap_init(&mac->mac_rrc);
break;
case ngran_gNB:
mac_rrc_ul_direct_init(&mac->mac_rrc);
break;
default:
AssertFatal(0 == 1, "Unknown node type %d\n", node_type);
break;
}
}
void mac_top_init_gNB(ngran_node_t node_type)
{
module_id_t i;
gNB_MAC_INST *nrmac;
LOG_I(MAC, "[MAIN] Init function start:nb_nr_macrlc_inst=%d\n",RC.nb_nr_macrlc_inst);
if (RC.nb_nr_macrlc_inst > 0) {
RC.nrmac = (gNB_MAC_INST **) malloc16(RC.nb_nr_macrlc_inst *sizeof(gNB_MAC_INST *));
AssertFatal(RC.nrmac != NULL,"can't ALLOCATE %zu Bytes for %d gNB_MAC_INST with size %zu \n",
RC.nb_nr_macrlc_inst * sizeof(gNB_MAC_INST *),
RC.nb_nr_macrlc_inst, sizeof(gNB_MAC_INST));
for (i = 0; i < RC.nb_nr_macrlc_inst; i++) {
RC.nrmac[i] = (gNB_MAC_INST *) malloc16(sizeof(gNB_MAC_INST));
AssertFatal(RC.nrmac != NULL,"can't ALLOCATE %zu Bytes for %d gNB_MAC_INST with size %zu \n",
RC.nb_nr_macrlc_inst * sizeof(gNB_MAC_INST *),
RC.nb_nr_macrlc_inst, sizeof(gNB_MAC_INST));
LOG_D(MAC,"[MAIN] ALLOCATE %zu Bytes for %d gNB_MAC_INST @ %p\n",sizeof(gNB_MAC_INST), RC.nb_nr_macrlc_inst, RC.mac);
bzero(RC.nrmac[i], sizeof(gNB_MAC_INST));
RC.nrmac[i]->Mod_id = i;
RC.nrmac[i]->tag = (NR_TAG_t*)malloc(sizeof(NR_TAG_t));
memset((void*)RC.nrmac[i]->tag,0,sizeof(NR_TAG_t));
RC.nrmac[i]->ul_handle = 0;
RC.nrmac[i]->first_MIB = true;
RC.nrmac[i]->cset0_bwp_start = 0;
RC.nrmac[i]->cset0_bwp_size = 0;
pthread_mutex_init(&RC.nrmac[i]->sched_lock, NULL);
pthread_mutex_init(&RC.nrmac[i]->UE_info.mutex, NULL);
uid_linear_allocator_init(&RC.nrmac[i]->UE_info.uid_allocator);
if (get_softmodem_params()->phy_test) {
RC.nrmac[i]->pre_processor_dl = nr_preprocessor_phytest;
RC.nrmac[i]->pre_processor_ul = nr_ul_preprocessor_phytest;
} else {
RC.nrmac[i]->pre_processor_dl = nr_init_fr1_dlsch_preprocessor(0);
RC.nrmac[i]->pre_processor_ul = nr_init_fr1_ulsch_preprocessor(0);
}
if (!IS_SOFTMODEM_NOSTATS_BIT)
threadCreate(&RC.nrmac[i]->stats_thread, nrmac_stats_thread, (void*)RC.nrmac[i], "MAC_STATS", -1, sched_get_priority_min(SCHED_OAI)+1 );
mac_rrc_init(RC.nrmac[i], node_type);
}//END for (i = 0; i < RC.nb_nr_macrlc_inst; i++)
AssertFatal(rlc_module_init(1) == 0,"Could not initialize RLC layer\n");
// These should be out of here later
if (get_softmodem_params()->usim_test == 0 ) nr_pdcp_layer_init();
if(IS_SOFTMODEM_NOS1 && get_softmodem_params()->phy_test) {
// get default noS1 configuration
NR_RadioBearerConfig_t *rbconfig = NULL;
NR_RLC_BearerConfig_t *rlc_rbconfig = NULL;
fill_nr_noS1_bearer_config(&rbconfig, &rlc_rbconfig);
NR_RLC_BearerConfig_t *rlc_rbconfig_list[1] = {rlc_rbconfig};
struct NR_CellGroupConfig__rlc_BearerToAddModList rlc_bearer_list = {
.list = { .array = rlc_rbconfig_list, .count = 1, .size = 1, }
};
/* Note! previously, in nr_DRB_preconfiguration(), we passed ENB_FLAG_NO
* if ENB_NAS_USE_TUN was *not* set. It seems to me that we could not set
* this flag anywhere in the code, hence we would always configure PDCP
* with ENB_FLAG_NO in nr_DRB_preconfiguration(). This makes sense for
* noS1, because the result of passing ENB_FLAG_NO to PDCP is that PDCP
* will output the packets at a local interface, which is in line with
* the noS1 mode. Hence, below, we simply hardcode ENB_FLAG_NO */
// setup PDCP, RLC
nr_pdcp_add_drbs(ENB_FLAG_NO, 0x1234, rbconfig->drb_ToAddModList, 0, NULL, NULL, &rlc_bearer_list);
nr_rlc_add_drb(0x1234, rbconfig->drb_ToAddModList->list.array[0]->drb_Identity, rlc_rbconfig);
// free memory
free_nr_noS1_bearer_config(&rbconfig, &rlc_rbconfig);
}
} else {
RC.nrmac = NULL;
}
// Initialize Linked-List for Active UEs
for (i = 0; i < RC.nb_nr_macrlc_inst; i++) {
nrmac = RC.nrmac[i];
nrmac->if_inst = NR_IF_Module_init(i);
memset(&nrmac->UE_info, 0, sizeof(nrmac->UE_info));
}
du_init_f1_ue_data();
srand48(0);
}
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