Lionel Gauthier
26495e6a0a
git-svn-id: http://svn.eurecom.fr/openair4G/trunk@5552 818b1a75-f10b-46b9-bf7c-635c3b92a50f
254 lines
10 KiB
C
254 lines
10 KiB
C
/*******************************************************************************
|
|
OpenAirInterface
|
|
Copyright(c) 1999 - 2014 Eurecom
|
|
|
|
OpenAirInterface is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
|
|
OpenAirInterface is distributed in the hope that 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.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with OpenAirInterface.The full GNU General Public License is
|
|
included in this distribution in the file called "COPYING". If not,
|
|
see <http://www.gnu.org/licenses/>.
|
|
|
|
Contact Information
|
|
OpenAirInterface Admin: openair_admin@eurecom.fr
|
|
OpenAirInterface Tech : openair_tech@eurecom.fr
|
|
OpenAirInterface Dev : openair4g-devel@eurecom.fr
|
|
|
|
Address : Eurecom, Compus SophiaTech 450, route des chappes, 06451 Biot, France.
|
|
|
|
*******************************************************************************/
|
|
|
|
/*! \file s1ap_eNB_nnsf.c
|
|
* \brief s1ap NAS node selection functions
|
|
* \author Sebastien ROUX <sebastien.roux@eurecom.fr>
|
|
* \date 2012
|
|
* \version 0.1
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "intertask_interface.h"
|
|
|
|
#include "s1ap_common.h"
|
|
|
|
#include "s1ap_eNB_defs.h"
|
|
#include "s1ap_eNB_nnsf.h"
|
|
|
|
struct s1ap_eNB_mme_data_s *
|
|
s1ap_eNB_nnsf_select_mme(s1ap_eNB_instance_t *instance_p,
|
|
rrc_establishment_cause_t cause)
|
|
{
|
|
struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
|
|
struct s1ap_eNB_mme_data_s *mme_highest_capacity_p = NULL;
|
|
uint8_t current_capacity = 0;
|
|
|
|
RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head)
|
|
{
|
|
if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
|
|
/* The association between MME and eNB is not ready for the moment,
|
|
* go to the next known MME.
|
|
*/
|
|
if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
|
|
/* MME is overloaded. We have to check the RRC establishment
|
|
* cause and take decision to the select this MME depending on
|
|
* the overload state.
|
|
*/
|
|
if ((cause == RRC_CAUSE_MO_DATA)
|
|
&& (mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_MO_DATA)) {
|
|
continue;
|
|
}
|
|
if ((mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_ALL_SIGNALLING)
|
|
&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA))) {
|
|
continue;
|
|
}
|
|
if ((mme_data_p->overload_state == S1AP_OVERLOAD_ONLY_EMERGENCY_AND_MT)
|
|
&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA)
|
|
|| (cause == RRC_CAUSE_HIGH_PRIO_ACCESS))) {
|
|
continue;
|
|
}
|
|
/* At this point, the RRC establishment can be handled by the MME
|
|
* even if it is in overload state.
|
|
*/
|
|
} else {
|
|
/* The MME is not overloaded, association is simply not ready. */
|
|
continue;
|
|
}
|
|
}
|
|
if (current_capacity < mme_data_p->relative_mme_capacity) {
|
|
/* We find a better MME, keep a reference to it */
|
|
current_capacity = mme_data_p->relative_mme_capacity;
|
|
mme_highest_capacity_p = mme_data_p;
|
|
}
|
|
}
|
|
|
|
return mme_highest_capacity_p;
|
|
}
|
|
|
|
struct s1ap_eNB_mme_data_s *
|
|
s1ap_eNB_nnsf_select_mme_by_mme_code(s1ap_eNB_instance_t *instance_p,
|
|
rrc_establishment_cause_t cause,
|
|
uint8_t mme_code)
|
|
{
|
|
struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
|
|
struct s1ap_eNB_mme_data_s *mme_highest_capacity_p = NULL;
|
|
uint8_t current_capacity = 0;
|
|
|
|
RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head) {
|
|
struct served_gummei_s *gummei_p = NULL;
|
|
|
|
if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
|
|
/* The association between MME and eNB is not ready for the moment,
|
|
* go to the next known MME.
|
|
*/
|
|
if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
|
|
/* MME is overloaded. We have to check the RRC establishment
|
|
* cause and take decision to the select this MME depending on
|
|
* the overload state.
|
|
*/
|
|
if ((cause == RRC_CAUSE_MO_DATA)
|
|
&& (mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_MO_DATA)) {
|
|
continue;
|
|
}
|
|
if ((mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_ALL_SIGNALLING)
|
|
&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA))) {
|
|
continue;
|
|
}
|
|
if ((mme_data_p->overload_state == S1AP_OVERLOAD_ONLY_EMERGENCY_AND_MT)
|
|
&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA)
|
|
|| (cause == RRC_CAUSE_HIGH_PRIO_ACCESS))) {
|
|
continue;
|
|
}
|
|
/* At this point, the RRC establishment can be handled by the MME
|
|
* even if it is in overload state.
|
|
*/
|
|
} else {
|
|
/* The MME is not overloaded, association is simply not ready. */
|
|
continue;
|
|
}
|
|
}
|
|
if (current_capacity < mme_data_p->relative_mme_capacity) {
|
|
/* We find a better MME, keep a reference to it */
|
|
current_capacity = mme_data_p->relative_mme_capacity;
|
|
mme_highest_capacity_p = mme_data_p;
|
|
}
|
|
|
|
/* Looking for MME code matching the one provided by NAS */
|
|
STAILQ_FOREACH(gummei_p, &mme_data_p->served_gummei, next) {
|
|
struct mme_code_s *mme_code_p = NULL;
|
|
|
|
STAILQ_FOREACH(mme_code_p, &gummei_p->mme_codes, next) {
|
|
if (mme_code_p->mme_code == mme_code) {
|
|
return mme_data_p;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* At this point no MME matches the provided GUMMEI. Select the one with the
|
|
* highest relative capacity.
|
|
* In case the list of known MME is empty, simply return NULL, that way the RRC
|
|
* layer should know about it and reject RRC connectivity.
|
|
*/
|
|
return mme_highest_capacity_p;
|
|
}
|
|
|
|
struct s1ap_eNB_mme_data_s *
|
|
s1ap_eNB_nnsf_select_mme_by_gummei(s1ap_eNB_instance_t *instance_p,
|
|
rrc_establishment_cause_t cause,
|
|
s1ap_gummei_t gummei)
|
|
{
|
|
struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
|
|
struct s1ap_eNB_mme_data_s *mme_highest_capacity_p = NULL;
|
|
uint8_t current_capacity = 0;
|
|
|
|
RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head) {
|
|
struct served_gummei_s *gummei_p = NULL;
|
|
|
|
if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
|
|
/* The association between MME and eNB is not ready for the moment,
|
|
* go to the next known MME.
|
|
*/
|
|
if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
|
|
/* MME is overloaded. We have to check the RRC establishment
|
|
* cause and take decision to the select this MME depending on
|
|
* the overload state.
|
|
*/
|
|
if ((cause == RRC_CAUSE_MO_DATA)
|
|
&& (mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_MO_DATA)) {
|
|
continue;
|
|
}
|
|
if ((mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_ALL_SIGNALLING)
|
|
&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA))) {
|
|
continue;
|
|
}
|
|
if ((mme_data_p->overload_state == S1AP_OVERLOAD_ONLY_EMERGENCY_AND_MT)
|
|
&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA)
|
|
|| (cause == RRC_CAUSE_HIGH_PRIO_ACCESS))) {
|
|
continue;
|
|
}
|
|
/* At this point, the RRC establishment can be handled by the MME
|
|
* even if it is in overload state.
|
|
*/
|
|
} else {
|
|
/* The MME is not overloaded, association is simply not ready. */
|
|
continue;
|
|
}
|
|
}
|
|
if (current_capacity < mme_data_p->relative_mme_capacity) {
|
|
/* We find a better MME, keep a reference to it */
|
|
current_capacity = mme_data_p->relative_mme_capacity;
|
|
mme_highest_capacity_p = mme_data_p;
|
|
}
|
|
|
|
/* Looking for MME gummei matching the one provided by NAS */
|
|
STAILQ_FOREACH(gummei_p, &mme_data_p->served_gummei, next) {
|
|
struct served_group_id_s *group_id_p = NULL;
|
|
struct mme_code_s *mme_code_p = NULL;
|
|
struct plmn_identity_s *served_plmn_p = NULL;
|
|
|
|
STAILQ_FOREACH(served_plmn_p, &gummei_p->served_plmns, next) {
|
|
if ((served_plmn_p->mcc == gummei.mcc) &&
|
|
(served_plmn_p->mnc == gummei.mnc)) {
|
|
break;
|
|
}
|
|
}
|
|
STAILQ_FOREACH(mme_code_p, &gummei_p->mme_codes, next) {
|
|
if (mme_code_p->mme_code == gummei.mme_code) {
|
|
break;
|
|
}
|
|
}
|
|
STAILQ_FOREACH(group_id_p, &gummei_p->served_group_ids, next) {
|
|
if (group_id_p->mme_group_id == gummei.mme_group_id) {
|
|
break;
|
|
}
|
|
}
|
|
/* The MME matches the parameters provided by the NAS layer ->
|
|
* the MME is knwown and the association is ready.
|
|
* Return the reference to the MME to use it for this UE.
|
|
*/
|
|
if ((group_id_p != NULL) &&
|
|
(mme_code_p != NULL) &&
|
|
(served_plmn_p != NULL)) {
|
|
return mme_data_p;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* At this point no MME matches the provided GUMMEI. Select the one with the
|
|
* highest relative capacity.
|
|
* In case the list of known MME is empty, simply return NULL, that way the RRC
|
|
* layer should know about it and reject RRC connectivity.
|
|
*/
|
|
return mme_highest_capacity_p;
|
|
}
|