enb_app.c 13.8 KB
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/*******************************************************************************

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 Eurecom OpenAirInterface
 Copyright(c) 1999 - 2012 Eurecom
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 This program is free software; you can redistribute it and/or modify it
 under the terms and conditions of the GNU General Public License,
 version 2, as published by the Free Software Foundation.
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 This program is distributed in the hope it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 more details.
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 You should have received a copy of the GNU General Public License along with
 this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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 The full GNU General Public License is included in this distribution in
 the file called "COPYING".
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 Contact Information
 Openair Admin: openair_admin@eurecom.fr
 Openair Tech : openair_tech@eurecom.fr
 Forums       : http://forums.eurecom.fr/openairinterface
 Address      : EURECOM, Campus SophiaTech, 450 Route des Chappes
 06410 Biot FRANCE
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 *******************************************************************************/
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#include <string.h>

#include "enb_app.h"
#include "assertions.h"

#include "log.h"
#if defined(OAI_EMU)
# include "OCG.h"
# include "OCG_extern.h"
#endif

#if defined(ENABLE_ITTI)
# include "intertask_interface.h"
# include "timer.h"
# if defined(ENABLE_USE_MME)
#   include "s1ap_eNB.h"
#   include "sctp_eNB_task.h"
# endif
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extern unsigned char NB_eNB_INST;
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#endif

#if defined(ENABLE_ITTI)

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/*------------------------------------------------------------------------------*/
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# if defined(ENABLE_USE_MME)
#   define ENB_REGISTER_RETRY_DELAY 10
# endif
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typedef struct mme_ip_address_s {
    unsigned ipv4:1;
    unsigned ipv6:1;
    char *ipv4_address;
    char *ipv6_address;
} mme_ip_address_t;

typedef struct Enb_properties_s {
    /* Unique eNB_id to identify the eNB within EPC.
     * For macro eNB ids this field should be 20 bits long.
     * For home eNB ids this field should be 28 bits long.
     */
    uint32_t eNB_id;

    /* The type of the cell */
    enum cell_type_e cell_type;

    /* Optional name for the cell
     * NOTE: the name can be NULL (i.e no name) and will be cropped to 150
     * characters.
     */
    char *eNB_name;

    /* Tracking area code */
    uint16_t tac;

    /* Mobile Country Code
     * Mobile Network Code
     */
    uint16_t mcc;
    uint16_t mnc;

    /* Default Paging DRX of the eNB as defined in TS 36.304 */
    paging_drx_t default_drx;

    /* Nb of MME to connect to */
    uint8_t          nb_mme;
    /* List of MME to connect to */
    mme_ip_address_t mme_ip_address[S1AP_MAX_NB_MME_IP_ADDRESS];
} Enb_properties_t;

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/*------------------------------------------------------------------------------*/
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# if defined(ENABLE_USE_MME)
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static uint32_t enb_nb = 1; /* Default number of eNB */
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# endif
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/* eNB 0 properties */
static Enb_properties_t enb_0_properties =
{
    347472,
    CELL_MACRO_ENB,
    "eNB_Eurecom_0",
    0,
    208,
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    92,
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    PAGING_DRX_256,
    1, /* There are 2 addresses defined, but use only one by default */
    {
        {
            1,
            0,
            "192.168.12.87",
            "2001:660:5502:12:30da:829a:2343:b6cf"
        },
        {
            1,
            0,
            "192.168.12.86",
            ""
        }
    }
};

/* eNB 1 properties */
static Enb_properties_t enb_1_properties =
{
    347473,
    CELL_MACRO_ENB,
    "eNB_Eurecom_1",
    0,
    208,
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    92,
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    PAGING_DRX_256,
    1, /* There are 2 addresses defined, but use only one by default */
    {
        {
            1,
            0,
            "192.168.12.87",
            "2001:660:5502:12:30da:829a:2343:b6cf"
        },
        {
            1,
            0,
            "192.168.12.88",
            ""
        }
    }
};

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/* eNB 2 properties */
static Enb_properties_t enb_2_properties =
{
    347474,
    CELL_MACRO_ENB,
    "eNB_Eurecom_2",
    0,
    208,
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    92,
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    PAGING_DRX_256,
    1,
    {
        {
            1,
            0,
            "192.168.12.87",
            "2001:660:5502:12:30da:829a:2343:b6cf"
        },
    }
};

/* eNB 3 properties */
static Enb_properties_t enb_3_properties =
{
    347475,
    CELL_MACRO_ENB,
    "eNB_Eurecom_3",
    0,
    208,
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    92,
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    PAGING_DRX_256,
    1,
    {
        {
            1,
            0,
            "192.168.12.87",
            "2001:660:5502:12:30da:829a:2343:b6cf"
        },
    }
};

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static Enb_properties_t *enb_properties[] =
{
    &enb_0_properties,
    &enb_1_properties,
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    &enb_2_properties,
    &enb_3_properties,
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};
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/*------------------------------------------------------------------------------*/
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static void configure_rrc(void)
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{
    uint32_t eNB_id_start = 0;
    uint32_t eNB_id_end = 1;
    uint32_t eNB_id;
    MessageDef *msg_p;

#   if defined(OAI_EMU)
    eNB_id_start = oai_emulation.info.first_enb_local;
    eNB_id_end = oai_emulation.info.first_enb_local + oai_emulation.info.nb_enb_local;
#   endif

    for (eNB_id = eNB_id_start; (eNB_id < eNB_id_end) ; eNB_id++)
    {
        msg_p = itti_alloc_new_message (TASK_ENB_APP, RRC_CONFIGURATION_REQ);

        RRC_CONFIGURATION_REQ (msg_p).cell_identity =   enb_properties[eNB_id]->eNB_id;
        RRC_CONFIGURATION_REQ (msg_p).tac =             enb_properties[eNB_id]->tac;
        RRC_CONFIGURATION_REQ (msg_p).mcc =             enb_properties[eNB_id]->mcc;
        RRC_CONFIGURATION_REQ (msg_p).mnc =             enb_properties[eNB_id]->mnc;

        itti_send_msg_to_task (TASK_RRC_ENB, eNB_id, msg_p);
    }
}

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# if defined(ENABLE_USE_MME)
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static uint32_t eNB_app_register()
{
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    uint32_t eNB_id_start = 0;
    uint32_t eNB_id_end = 1;
    uint32_t eNB_id;
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    uint32_t mme_id;
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    MessageDef *msg_p;
    uint32_t register_enb_pending = 0;

#   if defined(OAI_EMU)
    eNB_id_start = oai_emulation.info.first_enb_local;
    eNB_id_end = oai_emulation.info.first_enb_local + oai_emulation.info.nb_enb_local;
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    DevCheck(eNB_id_end <= NUMBER_OF_eNB_MAX, eNB_id_end, NUMBER_OF_eNB_MAX, 0);
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#   endif
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    DevCheck(eNB_id_end <= (sizeof(enb_properties) / sizeof(enb_properties[0])), eNB_id_end, (sizeof(enb_properties) / sizeof(enb_properties[0])), 0);
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    for (eNB_id = eNB_id_start; (eNB_id < eNB_id_end) ; eNB_id++)
    {
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#   if defined(OAI_EMU)
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        if (oai_emulation.info.cli_start_enb[eNB_id] == 1)
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#   endif
        {
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            s1ap_register_enb_req_t *s1ap_register_eNB;
            uint32_t hash;

            /* Overwrite default eNB ID */
            hash = s1ap_generate_eNB_id ();
            enb_properties[eNB_id]->eNB_id = eNB_id + (hash & 0xFFFF8);

            if (EPC_MODE_ENABLED)
            {
                /* Overwrite default IP v4 address by value from command line */
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                enb_properties[eNB_id]->mme_ip_address[0].ipv4_address = EPC_MODE_MME_ADDRESS;
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            }

            /* 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);

            s1ap_register_eNB = &S1AP_REGISTER_ENB_REQ(msg_p);

            /* Some default/random parameters */
            s1ap_register_eNB->eNB_id = enb_properties[eNB_id]->eNB_id;
            s1ap_register_eNB->cell_type = enb_properties[eNB_id]->cell_type;
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            s1ap_register_eNB->eNB_name = enb_properties[eNB_id]->eNB_name;
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            s1ap_register_eNB->tac = enb_properties[eNB_id]->tac;
            s1ap_register_eNB->mcc = enb_properties[eNB_id]->mcc;
            s1ap_register_eNB->mnc = enb_properties[eNB_id]->mnc;
            s1ap_register_eNB->default_drx = enb_properties[eNB_id]->default_drx;

            s1ap_register_eNB->nb_mme = enb_properties[eNB_id]->nb_mme;
            DevCheck(s1ap_register_eNB->nb_mme <= S1AP_MAX_NB_MME_IP_ADDRESS, eNB_id, s1ap_register_eNB->nb_mme, S1AP_MAX_NB_MME_IP_ADDRESS);

            for (mme_id = 0; mme_id < s1ap_register_eNB->nb_mme; mme_id++)
            {
                s1ap_register_eNB->mme_ip_address[mme_id].ipv4 = enb_properties[eNB_id]->mme_ip_address[mme_id].ipv4;
                s1ap_register_eNB->mme_ip_address[mme_id].ipv6 = enb_properties[eNB_id]->mme_ip_address[mme_id].ipv6;
                strncpy (s1ap_register_eNB->mme_ip_address[mme_id].ipv4_address,
                         enb_properties[eNB_id]->mme_ip_address[mme_id].ipv4_address,
                         sizeof(s1ap_register_eNB->mme_ip_address[0].ipv4_address));
                strncpy (s1ap_register_eNB->mme_ip_address[mme_id].ipv6_address,
                         enb_properties[eNB_id]->mme_ip_address[mme_id].ipv6_address,
                         sizeof(s1ap_register_eNB->mme_ip_address[0].ipv6_address));
            }

            itti_send_msg_to_task (TASK_S1AP, eNB_id, msg_p);

            register_enb_pending++;
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        }
    }
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    return register_enb_pending;
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}
# endif
#endif

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/*------------------------------------------------------------------------------*/
void *eNB_app_task(void *args_p)
{
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#if defined(ENABLE_ITTI)
# if defined(ENABLE_USE_MME)
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    static uint32_t register_enb_pending;
    static uint32_t registered_enb;
    static long enb_register_retry_timer_id;
# endif
    MessageDef *msg_p;
    const char *msg_name;
    instance_t instance;
    itti_mark_task_ready (TASK_ENB_APP);

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# if defined(ENABLE_USE_MME)
#   if defined(OAI_EMU)
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    enb_nb = oai_emulation.info.nb_enb_local;
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#   endif
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# endif

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    configure_rrc();

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# if defined(ENABLE_USE_MME)
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    /* Try to register each eNB */
    registered_enb = 0;
    register_enb_pending = eNB_app_register ();
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# else
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    /* 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);
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# endif

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    do
    {
        // Wait for a message
        itti_receive_msg (TASK_ENB_APP, &msg_p);
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        msg_name = ITTI_MSG_NAME (msg_p);
        instance = ITTI_MSG_INSTANCE (msg_p);
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        switch (ITTI_MSG_ID(msg_p))
        {
            case TERMINATE_MESSAGE:
                itti_exit_task ();
                break;
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            case MESSAGE_TEST:
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                LOG_I(ENB_APP, "Received %s\n", ITTI_MSG_NAME(msg_p));
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                break;
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# if defined(ENABLE_USE_MME)
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            case S1AP_REGISTER_ENB_CNF:
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                LOG_I(ENB_APP, "[eNB %d] Received %s: associated MME %d\n", instance, msg_name,
                      S1AP_REGISTER_ENB_CNF(msg_p).nb_mme);
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                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);
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#   if defined(OAI_EMU)
                        /* If also inform all NAS UE tasks */
                        for (instance = NB_eNB_INST + oai_emulation.info.first_ue_local;
                            instance < (NB_eNB_INST + oai_emulation.info.first_ue_local + oai_emulation.info.nb_ue_local); instance ++)
                        {
                            msg_init_p = itti_alloc_new_message (TASK_ENB_APP, INITIALIZE_MESSAGE);
                            itti_send_msg_to_task (TASK_NAS_UE, instance, msg_init_p);
                        }
#   endif
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                    }
                    else
                    {
                        uint32_t not_associated = enb_nb - registered_enb;

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                        LOG_W(ENB_APP, " %d eNB %s not associated with a MME, retrying registration in %d seconds ...\n",
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                              not_associated, not_associated > 1 ? "are" : "is", 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)
                        {
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                            LOG_E(ENB_APP, " Can not start eNB register retry timer, use \"usleep\" instead!\n");
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                            usleep(ENB_REGISTER_RETRY_DELAY * 1000000);
                            /* Restart the registration process */
                            registered_enb = 0;
                            register_enb_pending = eNB_app_register ();
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                        }
                    }
                }
                break;

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            case S1AP_DEREGISTERED_ENB_IND:
                LOG_W(ENB_APP, "[eNB %d] Received %s: associated MME %d\n", instance, msg_name,
                      S1AP_DEREGISTERED_ENB_IND(msg_p).nb_mme);

                /* TODO handle recovering of registration */
                break;

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            case TIMER_HAS_EXPIRED:
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                LOG_I(ENB_APP, " Received %s: timer_id %d\n", msg_name, TIMER_HAS_EXPIRED(msg_p).timer_id);
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                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 ();
                }
                break;
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# endif

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            default:
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                LOG_E(ENB_APP, "Received unexpected message %s\n", msg_name);
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                break;
        }
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        itti_free (ITTI_MSG_ORIGIN_ID(msg_p), msg_p);
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    } while (1);
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#endif

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    return NULL;
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}