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openairinterface5g/openair2/ENB_APP/enb_app.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 1.1 (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
*/
/*
enb_app.c
-------------------
AUTHOR : Laurent Winckel, Sebastien ROUX, Lionel GAUTHIER, Navid Nikaein
COMPANY : EURECOM
EMAIL : Lionel.Gauthier@eurecom.fr and Navid Nikaein
*/
#include <string.h>
#include <stdio.h>
#include "enb_app.h"
#include "enb_config.h"
#include "assertions.h"
#include "common/ran_context.h"
#include "common/utils/LOG/log.h"
#if defined(ENABLE_ITTI)
# include "intertask_interface.h"
# if defined(ENABLE_USE_MME)
# include "s1ap_eNB.h"
# include "sctp_eNB_task.h"
# include "gtpv1u_eNB_task.h"
/* temporary warning removale while implementing noS1 */
/* as config option */
# else
# ifdef EPC_MODE_ENABLED
# undef EPC_MODE_ENABLED
# endif
# define EPC_MODE_ENABLED 0
# endif
# include "x2ap_eNB.h"
# include "x2ap_messages_types.h"
# define X2AP_ENB_REGISTER_RETRY_DELAY 10
#include "openair1/PHY/INIT/phy_init.h"
extern unsigned char NB_eNB_INST;
#endif
extern RAN_CONTEXT_t RC;
#if defined(ENABLE_ITTI)
/*------------------------------------------------------------------------------*/
# if defined(ENABLE_USE_MME)
# define ENB_REGISTER_RETRY_DELAY 10
# endif
#include "targets/RT/USER/lte-softmodem.h"
/*------------------------------------------------------------------------------*/
/*
static void configure_phy(module_id_t enb_id, const Enb_properties_array_t* enb_properties)
{
MessageDef *msg_p;
int CC_id;
msg_p = itti_alloc_new_message (TASK_ENB_APP, PHY_CONFIGURATION_REQ);
for (CC_id=0; CC_id<MAX_NUM_CCs; CC_id++) {
PHY_CONFIGURATION_REQ (msg_p).frame_type[CC_id] = enb_properties->properties[enb_id]->frame_type[CC_id];
PHY_CONFIGURATION_REQ (msg_p).prefix_type[CC_id] = enb_properties->properties[enb_id]->prefix_type[CC_id];
PHY_CONFIGURATION_REQ (msg_p).downlink_frequency[CC_id] = enb_properties->properties[enb_id]->downlink_frequency[CC_id];
PHY_CONFIGURATION_REQ (msg_p).uplink_frequency_offset[CC_id] = enb_properties->properties[enb_id]->uplink_frequency_offset[CC_id];
PHY_CONFIGURATION_REQ (msg_p).nb_antennas_tx[CC_id] = enb_properties->properties[enb_id]->nb_antennas_tx[CC_id];
PHY_CONFIGURATION_REQ (msg_p).nb_antennas_rx[CC_id] = enb_properties->properties[enb_id]->nb_antennas_rx[CC_id];
PHY_CONFIGURATION_REQ (msg_p).tx_gain[CC_id] = enb_properties->properties[enb_id]->tx_gain[CC_id];
PHY_CONFIGURATION_REQ (msg_p).rx_gain[CC_id] = enb_properties->properties[enb_id]->rx_gain[CC_id];
}
itti_send_msg_to_task (TASK_PHY_ENB, ENB_MODULE_ID_TO_INSTANCE(enb_id), msg_p);
}
*/
/*------------------------------------------------------------------------------*/
static void configure_rrc(uint32_t enb_id)
{
MessageDef *msg_p = NULL;
// int CC_id;
msg_p = itti_alloc_new_message (TASK_ENB_APP, RRC_CONFIGURATION_REQ);
if (RC.rrc[enb_id]) {
RCconfig_RRC(msg_p,enb_id, RC.rrc[enb_id]);
LOG_I(ENB_APP,"Sending configuration message to RRC task\n");
itti_send_msg_to_task (TASK_RRC_ENB, ENB_MODULE_ID_TO_INSTANCE(enb_id), msg_p);
}
else AssertFatal(0,"RRC context for eNB %d not allocated\n",enb_id);
}
/*------------------------------------------------------------------------------*/
# if defined(ENABLE_USE_MME)
static uint32_t eNB_app_register(uint32_t enb_id_start, uint32_t enb_id_end)//, const Enb_properties_array_t *enb_properties)
{
uint32_t enb_id;
MessageDef *msg_p;
uint32_t register_enb_pending = 0;
for (enb_id = enb_id_start; (enb_id < enb_id_end) ; enb_id++) {
{
/* note: there is an implicit relationship between the data structure and the message name */
msg_p = itti_alloc_new_message (TASK_ENB_APP, S1AP_REGISTER_ENB_REQ);
RCconfig_S1(msg_p, enb_id);
if (enb_id == 0) RCconfig_gtpu();
LOG_I(ENB_APP,"default drx %d\n",((S1AP_REGISTER_ENB_REQ(msg_p)).default_drx));
LOG_I(ENB_APP,"[eNB %d] eNB_app_register for instance %d\n", enb_id, ENB_MODULE_ID_TO_INSTANCE(enb_id));
itti_send_msg_to_task (TASK_S1AP, ENB_MODULE_ID_TO_INSTANCE(enb_id), msg_p);
register_enb_pending++;
}
}
return register_enb_pending;
}
# endif
#endif
/*------------------------------------------------------------------------------*/
static uint32_t eNB_app_register_x2(uint32_t enb_id_start, uint32_t enb_id_end)
{
uint32_t enb_id;
MessageDef *msg_p;
uint32_t register_enb_x2_pending = 0;
for (enb_id = enb_id_start; (enb_id < enb_id_end) ; enb_id++) {
{
msg_p = itti_alloc_new_message (TASK_ENB_APP, X2AP_REGISTER_ENB_REQ);
RCconfig_X2(msg_p, enb_id);
itti_send_msg_to_task (TASK_X2AP, ENB_MODULE_ID_TO_INSTANCE(enb_id), msg_p);
register_enb_x2_pending++;
}
}
return register_enb_x2_pending;
}
/*------------------------------------------------------------------------------*/
void *eNB_app_task(void *args_p)
{
#if defined(ENABLE_ITTI)
uint32_t enb_nb = RC.nb_inst;
uint32_t enb_id_start = 0;
uint32_t enb_id_end = enb_id_start + enb_nb;
# if defined(ENABLE_USE_MME)
uint32_t register_enb_pending=0;
uint32_t registered_enb;
long enb_register_retry_timer_id;
# endif
uint32_t x2_register_enb_pending;
uint32_t x2_registered_enb;
long x2_enb_register_retry_timer_id;
uint32_t enb_id;
MessageDef *msg_p = NULL;
instance_t instance;
int result;
/* for no gcc warnings */
(void)instance;
itti_mark_task_ready (TASK_ENB_APP);
LOG_I(PHY, "%s() Task ready initialise structures\n", __FUNCTION__);
RCconfig_L1();
RCconfig_macrlc();
LOG_I(PHY, "%s() RC.nb_L1_inst:%d\n", __FUNCTION__, RC.nb_L1_inst);
if (RC.nb_L1_inst>0) AssertFatal(l1_north_init_eNB()==0,"could not initialize L1 north interface\n");
AssertFatal (enb_nb <= RC.nb_inst,
"Number of eNB is greater than eNB defined in configuration file (%d/%d)!",
enb_nb, RC.nb_inst);
LOG_I(ENB_APP,"Allocating eNB_RRC_INST for %d instances\n",RC.nb_inst);
RC.rrc = (eNB_RRC_INST **)malloc(RC.nb_inst*sizeof(eNB_RRC_INST *));
LOG_I(PHY, "%s() RC.nb_inst:%d RC.rrc:%p\n", __FUNCTION__, RC.nb_inst, RC.rrc);
for (enb_id = enb_id_start; (enb_id < enb_id_end) ; enb_id++) {
RC.rrc[enb_id] = (eNB_RRC_INST*)malloc(sizeof(eNB_RRC_INST));
LOG_I(PHY, "%s() Creating RRC instance RC.rrc[%d]:%p (%d of %d)\n", __FUNCTION__, enb_id, RC.rrc[enb_id], enb_id+1, enb_id_end);
memset((void *)RC.rrc[enb_id],0,sizeof(eNB_RRC_INST));
configure_rrc(enb_id);
}
# if defined(ENABLE_USE_MME)
/* Try to register each eNB */
registered_enb = 0;
register_enb_pending = eNB_app_register (enb_id_start, enb_id_end);//, enb_properties_p);
#else
/* Start L2L1 task */
msg_p = itti_alloc_new_message(TASK_ENB_APP, INITIALIZE_MESSAGE);
itti_send_msg_to_task(TASK_L2L1, INSTANCE_DEFAULT, msg_p);
#endif
/* Try to register each eNB with each other */
x2_registered_enb = 0;
x2_register_enb_pending = eNB_app_register_x2 (enb_id_start, enb_id_end);
do {
// Wait for a message
itti_receive_msg (TASK_ENB_APP, &msg_p);
instance = ITTI_MSG_INSTANCE (msg_p);
switch (ITTI_MSG_ID(msg_p)) {
case TERMINATE_MESSAGE:
LOG_W(ENB_APP, " *** Exiting ENB_APP thread\n");
itti_exit_task ();
break;
case MESSAGE_TEST:
LOG_I(ENB_APP, "Received %s\n", ITTI_MSG_NAME(msg_p));
break;
case SOFT_RESTART_MESSAGE:
handle_reconfiguration(instance);
break;
case S1AP_REGISTER_ENB_CNF:
# if defined(ENABLE_USE_MME)
LOG_I(ENB_APP, "[eNB %d] Received %s: associated MME %d\n", instance, ITTI_MSG_NAME (msg_p),
S1AP_REGISTER_ENB_CNF(msg_p).nb_mme);
DevAssert(register_enb_pending > 0);
register_enb_pending--;
/* Check if at least eNB is registered with one MME */
if (S1AP_REGISTER_ENB_CNF(msg_p).nb_mme > 0) {
registered_enb++;
}
/* Check if all register eNB requests have been processed */
if (register_enb_pending == 0) {
if (registered_enb == enb_nb) {
/* If all eNB are registered, start L2L1 task */
MessageDef *msg_init_p;
msg_init_p = itti_alloc_new_message (TASK_ENB_APP, INITIALIZE_MESSAGE);
itti_send_msg_to_task (TASK_L2L1, INSTANCE_DEFAULT, msg_init_p);
} else {
LOG_W(ENB_APP, " %d eNB not associated with a MME, retrying registration in %d seconds ...\n",
enb_nb - registered_enb, ENB_REGISTER_RETRY_DELAY);
/* Restart the eNB registration process in ENB_REGISTER_RETRY_DELAY seconds */
if (timer_setup (ENB_REGISTER_RETRY_DELAY, 0, TASK_ENB_APP, INSTANCE_DEFAULT, TIMER_ONE_SHOT,
NULL, &enb_register_retry_timer_id) < 0) {
LOG_E(ENB_APP, " Can not start eNB register retry timer, use \"sleep\" instead!\n");
sleep(ENB_REGISTER_RETRY_DELAY);
/* Restart the registration process */
registered_enb = 0;
register_enb_pending = eNB_app_register (enb_id_start, enb_id_end);//, enb_properties_p);
}
}
}
#endif
break;
case S1AP_DEREGISTERED_ENB_IND:
if (EPC_MODE_ENABLED) {
LOG_W(ENB_APP, "[eNB %d] Received %s: associated MME %d\n", instance, ITTI_MSG_NAME (msg_p),
S1AP_DEREGISTERED_ENB_IND(msg_p).nb_mme);
/* TODO handle recovering of registration */
}
break;
case TIMER_HAS_EXPIRED:
# if defined(ENABLE_USE_MME)
LOG_I(ENB_APP, " Received %s: timer_id %ld\n", ITTI_MSG_NAME (msg_p), TIMER_HAS_EXPIRED(msg_p).timer_id);
if (TIMER_HAS_EXPIRED (msg_p).timer_id == enb_register_retry_timer_id) {
/* Restart the registration process */
registered_enb = 0;
register_enb_pending = eNB_app_register (enb_id_start, enb_id_end);//, enb_properties_p);
}
if (TIMER_HAS_EXPIRED (msg_p).timer_id == x2_enb_register_retry_timer_id) {
/* Restart the registration process */
x2_registered_enb = 0;
x2_register_enb_pending = eNB_app_register_x2 (enb_id_start, enb_id_end);
}
# endif
break;
case X2AP_DEREGISTERED_ENB_IND:
LOG_W(ENB_APP, "[eNB %d] Received %s: associated eNB %d\n", instance, ITTI_MSG_NAME (msg_p),
X2AP_DEREGISTERED_ENB_IND(msg_p).nb_x2);
/* TODO handle recovering of registration */
break;
case X2AP_REGISTER_ENB_CNF:
LOG_I(ENB_APP, "[eNB %d] Received %s: associated eNB %d\n", instance, ITTI_MSG_NAME (msg_p),
X2AP_REGISTER_ENB_CNF(msg_p).nb_x2);
DevAssert(x2_register_enb_pending > 0);
x2_register_enb_pending--;
/* Check if at least eNB is registered with one target eNB */
if (X2AP_REGISTER_ENB_CNF(msg_p).nb_x2 > 0) {
x2_registered_enb++;
}
/* Check if all register eNB requests have been processed */
if (x2_register_enb_pending == 0) {
if (x2_registered_enb == enb_nb) {
/* If all eNB are registered, start RRC HO task */
}else {
uint32_t x2_not_associated = enb_nb - x2_registered_enb;
LOG_W(ENB_APP, " %d eNB %s not associated with the target\n",
x2_not_associated, x2_not_associated > 1 ? "are" : "is");
// timer to retry
/* Restart the eNB registration process in ENB_REGISTER_RETRY_DELAY seconds */
if (timer_setup (X2AP_ENB_REGISTER_RETRY_DELAY, 0, TASK_ENB_APP,
INSTANCE_DEFAULT, TIMER_ONE_SHOT, NULL,
&x2_enb_register_retry_timer_id) < 0) {
LOG_E(ENB_APP, " Can not start eNB X2AP register: retry timer, use \"sleep\" instead!\n");
sleep(X2AP_ENB_REGISTER_RETRY_DELAY);
/* Restart the registration process */
x2_registered_enb = 0;
x2_register_enb_pending = eNB_app_register_x2 (enb_id_start, enb_id_end);
}
}
}
break;
default:
LOG_E(ENB_APP, "Received unexpected message %s\n", ITTI_MSG_NAME (msg_p));
break;
}
result = itti_free (ITTI_MSG_ORIGIN_ID(msg_p), msg_p);
AssertFatal (result == EXIT_SUCCESS, "Failed to free memory (%d)!\n", result);
} while (1);
#endif
return NULL;
}
void handle_reconfiguration(module_id_t mod_id)
{
struct timespec start, end;
clock_gettime(CLOCK_MONOTONIC, &start);
flexran_agent_info_t *flexran = RC.flexran[mod_id];
LOG_I(ENB_APP, "lte-softmodem soft-restart requested\n");
if (ENB_WAIT == flexran->node_ctrl_state) {
/* this is already waiting, just release */
pthread_mutex_lock(&flexran->mutex_node_ctrl);
flexran->node_ctrl_state = ENB_NORMAL_OPERATION;
pthread_mutex_unlock(&flexran->mutex_node_ctrl);
pthread_cond_signal(&flexran->cond_node_ctrl);
return;
}
if (stop_L1L2(mod_id) < 0) {
LOG_E(ENB_APP, "can not stop lte-softmodem, aborting restart\n");
return;
}
/* node_ctrl_state should have value ENB_MAKE_WAIT only if this method is not
* executed by the FlexRAN thread */
if (ENB_MAKE_WAIT == flexran->node_ctrl_state) {
LOG_I(ENB_APP, " * eNB %d: Waiting for FlexRAN RTController command *\n", mod_id);
pthread_mutex_lock(&flexran->mutex_node_ctrl);
flexran->node_ctrl_state = ENB_WAIT;
while (ENB_NORMAL_OPERATION != flexran->node_ctrl_state)
pthread_cond_wait(&flexran->cond_node_ctrl, &flexran->mutex_node_ctrl);
pthread_mutex_unlock(&flexran->mutex_node_ctrl);
}
if (restart_L1L2(mod_id) < 0) {
LOG_E(ENB_APP, "can not restart, killing lte-softmodem\n");
exit_fun("can not restart L1L2, killing lte-softmodem");
return;
}
clock_gettime(CLOCK_MONOTONIC, &end);
end.tv_sec -= start.tv_sec;
if (end.tv_nsec >= start.tv_nsec) {
end.tv_nsec -= start.tv_nsec;
} else {
end.tv_sec -= 1;
end.tv_nsec = end.tv_nsec - start.tv_nsec + 1000000000;
}
LOG_I(ENB_APP, "lte-softmodem restart succeeded in %ld.%ld s\n", end.tv_sec, end.tv_nsec / 1000000);
}
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