450 lines
16 KiB
C
450 lines
16 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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/*! \file s1ap_eNB_nnsf.c
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* \brief s1ap NAS node selection functions
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* \author Sebastien ROUX <sebastien.roux@eurecom.fr>
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* \date 2012
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* \version 0.1
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "intertask_interface.h"
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#include "s1ap_common.h"
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#include "s1ap_eNB_defs.h"
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#include "s1ap_eNB_nnsf.h"
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typedef struct MME_nnsf_inf {
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struct s1ap_eNB_mme_data_s *mme_p;
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uint64_t weight;
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} MME_nnsf_inf_t;
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struct s1ap_eNB_mme_data_s *
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s1ap_eNB_nnsf_select_mme(s1ap_eNB_instance_t *instance_p,
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rrc_establishment_cause_t cause)
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{
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struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
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struct s1ap_eNB_mme_data_s *mme_highest_capacity_p = NULL;
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uint16_t capacity_sum = 0;
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MME_nnsf_inf_t mme_inf[10];
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int cnt;
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int nb_mme = 0;
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uint64_t weight = 0;
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memset(mme_inf, 0, sizeof(mme_inf));
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RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head) {
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capacity_sum = capacity_sum + mme_data_p->relative_mme_capacity;
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if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
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/* The association between MME and eNB is not ready for the moment,
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* go to the next known MME.
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*/
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if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
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/* MME is overloaded. We have to check the RRC establishment
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* cause and take decision to the select this MME depending on
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* the overload state.
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*/
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if ((cause == RRC_CAUSE_MO_DATA)
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&& (mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_MO_DATA)) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_ALL_SIGNALLING)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA))) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_ONLY_EMERGENCY_AND_MT)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA)
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|| (cause == RRC_CAUSE_HIGH_PRIO_ACCESS))) {
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continue;
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}
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mme_inf[nb_mme].mme_p = mme_data_p;
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nb_mme++;
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/* At this point, the RRC establishment can be handled by the MME
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* even if it is in overload state.
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*/
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} else {
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/* The MME is not overloaded, association is simply not ready. */
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continue;
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}
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}
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}
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if( nb_mme != 0 ) {
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for( cnt = 0 ; cnt < nb_mme ; cnt++ ) {
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mme_inf[cnt].weight = (capacity_sum*10)/mme_inf[cnt].mme_p->relative_mme_capacity;
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mme_inf[cnt].weight = (mme_inf[cnt].weight)*(mme_inf[cnt].mme_p->nb_calls + 1);
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}
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mme_highest_capacity_p = mme_inf[0].mme_p;
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weight = mme_inf[0].weight;
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for( cnt = 1 ; cnt < nb_mme ; cnt++ ) {
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if( weight > mme_inf[cnt].weight ) {
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mme_highest_capacity_p = mme_inf[cnt].mme_p;
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weight = mme_inf[cnt].weight;
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}
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}
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} else {
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mme_highest_capacity_p = NULL;
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}
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if( mme_highest_capacity_p != NULL ) {
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mme_highest_capacity_p->nb_calls++;
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}
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return mme_highest_capacity_p;
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}
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struct s1ap_eNB_mme_data_s *
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s1ap_eNB_nnsf_select_mme_by_plmn_id(s1ap_eNB_instance_t *instance_p,
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rrc_establishment_cause_t cause,
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int selected_plmn_identity)
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{
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struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
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struct s1ap_eNB_mme_data_s *mme_highest_capacity_p = NULL;
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uint16_t capacity_sum = 0;
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MME_nnsf_inf_t mme_inf[10];
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int cnt;
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int nb_mme = 0;
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uint64_t weight = 0;
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memset(mme_inf, 0, sizeof(mme_inf));
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RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head) {
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struct served_gummei_s *gummei_p = NULL;
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struct plmn_identity_s *served_plmn_p = NULL;
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if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
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/* The association between MME and eNB is not ready for the moment,
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* go to the next known MME.
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*/
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if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
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/* MME is overloaded. We have to check the RRC establishment
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* cause and take decision to the select this MME depending on
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* the overload state.
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*/
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if ((cause == RRC_CAUSE_MO_DATA)
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&& (mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_MO_DATA)) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_ALL_SIGNALLING)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA))) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_ONLY_EMERGENCY_AND_MT)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA)
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|| (cause == RRC_CAUSE_HIGH_PRIO_ACCESS))) {
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continue;
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}
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/* At this point, the RRC establishment can be handled by the MME
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* even if it is in overload state.
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*/
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} else {
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/* The MME is not overloaded, association is simply not ready. */
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continue;
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}
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}
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/* Looking for served GUMMEI PLMN Identity selected matching the one provided by the UE */
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STAILQ_FOREACH(gummei_p, &mme_data_p->served_gummei, next) {
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STAILQ_FOREACH(served_plmn_p, &gummei_p->served_plmns, next) {
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if ((served_plmn_p->mcc == instance_p->mcc[selected_plmn_identity]) &&
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(served_plmn_p->mnc == instance_p->mnc[selected_plmn_identity])) {
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mme_inf[nb_mme].mme_p = mme_data_p;
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nb_mme++;
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break;
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}
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}
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/* if found, we can stop the outer loop, too */
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if (served_plmn_p) break;
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}
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/* if we didn't find such a served PLMN, go on with the next MME */
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if (!served_plmn_p) continue;
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}
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if( nb_mme != 0 ) {
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for( cnt = 0 ; cnt < nb_mme ; cnt++ ) {
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mme_inf[cnt].weight = (capacity_sum*10)/mme_inf[cnt].mme_p->relative_mme_capacity;
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mme_inf[cnt].weight = (mme_inf[cnt].weight)*(mme_inf[cnt].mme_p->nb_calls + 1);
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}
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mme_highest_capacity_p = mme_inf[0].mme_p;
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weight = mme_inf[0].weight;
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for( cnt = 1 ; cnt < nb_mme ; cnt++ ) {
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if( weight > mme_inf[cnt].weight ) {
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mme_highest_capacity_p = mme_inf[cnt].mme_p;
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weight = mme_inf[cnt].weight;
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}
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}
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} else {
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mme_highest_capacity_p = NULL;
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}
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if( mme_highest_capacity_p != NULL ) {
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mme_highest_capacity_p->nb_calls++;
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}
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return mme_highest_capacity_p;
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}
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struct s1ap_eNB_mme_data_s *
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s1ap_eNB_nnsf_select_mme_by_mme_code(s1ap_eNB_instance_t *instance_p,
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rrc_establishment_cause_t cause,
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int selected_plmn_identity,
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uint8_t mme_code)
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{
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struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
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RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head) {
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struct served_gummei_s *gummei_p = NULL;
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if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
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/* The association between MME and eNB is not ready for the moment,
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* go to the next known MME.
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*/
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if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
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/* MME is overloaded. We have to check the RRC establishment
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* cause and take decision to the select this MME depending on
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* the overload state.
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*/
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if ((cause == RRC_CAUSE_MO_DATA)
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&& (mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_MO_DATA)) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_ALL_SIGNALLING)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA))) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_ONLY_EMERGENCY_AND_MT)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA)
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|| (cause == RRC_CAUSE_HIGH_PRIO_ACCESS))) {
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continue;
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}
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/* At this point, the RRC establishment can be handled by the MME
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* even if it is in overload state.
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*/
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} else {
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/* The MME is not overloaded, association is simply not ready. */
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continue;
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}
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}
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/* Looking for MME code matching the one provided by NAS */
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STAILQ_FOREACH(gummei_p, &mme_data_p->served_gummei, next) {
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struct mme_code_s *mme_code_p = NULL;
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struct plmn_identity_s *served_plmn_p = NULL;
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STAILQ_FOREACH(served_plmn_p, &gummei_p->served_plmns, next) {
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if ((served_plmn_p->mcc == instance_p->mcc[selected_plmn_identity]) &&
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(served_plmn_p->mnc == instance_p->mnc[selected_plmn_identity])) {
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break;
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}
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}
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STAILQ_FOREACH(mme_code_p, &gummei_p->mme_codes, next) {
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if (mme_code_p->mme_code == mme_code) {
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break;
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}
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}
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/* The MME matches the parameters provided by the NAS layer ->
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* the MME is knwown and the association is ready.
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* Return the reference to the MME to use it for this UE.
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*/
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if (mme_code_p && served_plmn_p) {
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return mme_data_p;
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}
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}
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}
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/* At this point no MME matches the selected PLMN and MME code. In this case,
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* return NULL. That way the RRC layer should know about it and reject RRC
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* connectivity. */
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return NULL;
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}
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struct s1ap_eNB_mme_data_s *
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s1ap_eNB_nnsf_select_mme_by_gummei(s1ap_eNB_instance_t *instance_p,
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rrc_establishment_cause_t cause,
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s1ap_gummei_t gummei)
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{
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struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
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RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head) {
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struct served_gummei_s *gummei_p = NULL;
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if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
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/* The association between MME and eNB is not ready for the moment,
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* go to the next known MME.
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*/
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if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
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/* MME is overloaded. We have to check the RRC establishment
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* cause and take decision to the select this MME depending on
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* the overload state.
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*/
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if ((cause == RRC_CAUSE_MO_DATA)
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&& (mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_MO_DATA)) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_REJECT_ALL_SIGNALLING)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA))) {
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continue;
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}
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if ((mme_data_p->overload_state == S1AP_OVERLOAD_ONLY_EMERGENCY_AND_MT)
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&& ((cause == RRC_CAUSE_MO_SIGNALLING) || (cause == RRC_CAUSE_MO_DATA)
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|| (cause == RRC_CAUSE_HIGH_PRIO_ACCESS))) {
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continue;
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}
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/* At this point, the RRC establishment can be handled by the MME
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* even if it is in overload state.
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*/
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} else {
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/* The MME is not overloaded, association is simply not ready. */
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continue;
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}
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}
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/* Looking for MME gummei matching the one provided by NAS */
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STAILQ_FOREACH(gummei_p, &mme_data_p->served_gummei, next) {
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struct served_group_id_s *group_id_p = NULL;
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struct mme_code_s *mme_code_p = NULL;
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struct plmn_identity_s *served_plmn_p = NULL;
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STAILQ_FOREACH(served_plmn_p, &gummei_p->served_plmns, next) {
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if ((served_plmn_p->mcc == gummei.mcc) &&
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(served_plmn_p->mnc == gummei.mnc)) {
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break;
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}
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}
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STAILQ_FOREACH(mme_code_p, &gummei_p->mme_codes, next) {
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if (mme_code_p->mme_code == gummei.mme_code) {
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break;
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}
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}
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STAILQ_FOREACH(group_id_p, &gummei_p->served_group_ids, next) {
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if (group_id_p->mme_group_id == gummei.mme_group_id) {
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break;
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}
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}
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/* The MME matches the parameters provided by the NAS layer ->
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* the MME is knwown and the association is ready.
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* Return the reference to the MME to use it for this UE.
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*/
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if ((group_id_p != NULL) &&
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(mme_code_p != NULL) &&
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(served_plmn_p != NULL)) {
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return mme_data_p;
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}
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}
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}
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/* At this point no MME matches the provided GUMMEI. In this case, return
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* NULL. That way the RRC layer should know about it and reject RRC
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* connectivity. */
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return NULL;
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}
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struct s1ap_eNB_mme_data_s *
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s1ap_eNB_nnsf_select_mme_by_gummei_no_cause(s1ap_eNB_instance_t *instance_p,
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s1ap_gummei_t gummei)
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{
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struct s1ap_eNB_mme_data_s *mme_data_p = NULL;
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struct s1ap_eNB_mme_data_s *mme_highest_capacity_p = NULL;
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uint8_t current_capacity = 0;
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RB_FOREACH(mme_data_p, s1ap_mme_map, &instance_p->s1ap_mme_head) {
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struct served_gummei_s *gummei_p = NULL;
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if (mme_data_p->state != S1AP_ENB_STATE_CONNECTED) {
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/* The association between MME and eNB is not ready for the moment,
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* go to the next known MME.
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*/
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if (mme_data_p->state == S1AP_ENB_OVERLOAD) {
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/* MME is overloaded. We have to check the RRC establishment
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* cause and take decision to the select this MME depending on
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* the overload state.
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*/
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} else {
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/* The MME is not overloaded, association is simply not ready. */
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continue;
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}
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}
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if (current_capacity < mme_data_p->relative_mme_capacity) {
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/* We find a better MME, keep a reference to it */
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current_capacity = mme_data_p->relative_mme_capacity;
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mme_highest_capacity_p = mme_data_p;
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}
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/* Looking for MME gummei matching the one provided by NAS */
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STAILQ_FOREACH(gummei_p, &mme_data_p->served_gummei, next) {
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struct served_group_id_s *group_id_p = NULL;
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struct mme_code_s *mme_code_p = NULL;
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struct plmn_identity_s *served_plmn_p = NULL;
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STAILQ_FOREACH(served_plmn_p, &gummei_p->served_plmns, next) {
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if ((served_plmn_p->mcc == gummei.mcc) &&
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(served_plmn_p->mnc == gummei.mnc)) {
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break;
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}
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}
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STAILQ_FOREACH(mme_code_p, &gummei_p->mme_codes, next) {
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if (mme_code_p->mme_code == gummei.mme_code) {
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break;
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}
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}
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STAILQ_FOREACH(group_id_p, &gummei_p->served_group_ids, next) {
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if (group_id_p->mme_group_id == gummei.mme_group_id) {
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break;
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}
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}
|
|
|
|
/* 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;
|
|
}
|