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[AMF] Implicit Network-initiated Deregistration 

Two timers are introduced (both with duration of T3512 + 4 min):
-MOBILE_REACHABLE
-IMPLICIT_DEREGISTRATION
MOBILE_REACHABLE is set when NAS connection for the UE is released.
IMPLICIT_DEREGISTRATION is set when MOBILE_REACHABLE expires.

On MOBILE_REACHABLE expiry Paging is ignored.
On IMPLICIT_DEREGISTRATION expiry:
-UE's RM_State is set to DEREGISTERED
-UE is Nudm_SDM_Unsubscribed
-UE is Nudm_UECM_Deregistered
-PDU sessions are released
-AM policies are deleted

Existing flag amf_ue->network_initiated_de_reg is used.
This commit is contained in:
Gaber Stare 2022-12-23 10:06:30 +00:00 committed by Sukchan Lee
parent 8553c77733
commit bfd5cefe53
6 changed files with 157 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
src/amf/context.c
View File

@ -1177,6 +1177,28 @@ void ran_ue_remove(ran_ue_t *ran_ue)
ogs_pool_free(&ran_ue_pool, ran_ue);
stats_remove_ran_ue();
if (ran_ue->amf_ue) {
if (ran_ue->amf_ue->rm_state == RM_STATE_REGISTERED) {
/* Start AMF_TIMER_MOBILE_REACHABLE
* TS 24.501
* 5.3.7 Handling of the periodic registration update timer and
* mobile reachable timer
* The network supervises the periodic registration update procedure
* of the UE by means of the mobile reachable timer.
* If the UE is not registered for emergency services,
* the mobile reachable timer shall be longer than the value of timer
* T3512. In this case, by default, the mobile reachable timer is
* 4 minutes greater than the value of timer T3512.
* The mobile reachable timer shall be reset and started with the
* value as indicated above, when the AMF releases the NAS signalling
* connection for the UE.
* TODO: If the UE is registered for emergency services, the AMF shall
* set the mobile reachable timer with a value equal to timer T3512.
*/
ogs_timer_start(ran_ue->amf_ue->mobile_reachable.timer,
ogs_time_from_sec(amf_self()->time.t3512.value + 240));
}
}
}
void ran_ue_switch_to_gnb(ran_ue_t *ran_ue, amf_gnb_t *new_gnb)
@ -1378,6 +1400,22 @@ amf_ue_t *amf_ue_add(ran_ue_t *ran_ue)
return NULL;
}
amf_ue->t3570.pkbuf = NULL;
amf_ue->mobile_reachable.timer = ogs_timer_add(
ogs_app()->timer_mgr, amf_timer_mobile_reachable_expire, amf_ue);
if (!amf_ue->mobile_reachable.timer) {
ogs_error("ogs_timer_add() failed");
ogs_pool_free(&amf_ue_pool, amf_ue);
return NULL;
}
amf_ue->mobile_reachable.pkbuf = NULL;
amf_ue->implicit_deregistration.timer = ogs_timer_add(
ogs_app()->timer_mgr, amf_timer_implicit_deregistration_expire, amf_ue);
if (!amf_ue->implicit_deregistration.timer) {
ogs_error("ogs_timer_add() failed");
ogs_pool_free(&amf_ue_pool, amf_ue);
return NULL;
}
amf_ue->implicit_deregistration.pkbuf = NULL;
/* SBI Type */
amf_ue->sbi.type = OGS_SBI_OBJ_UE_TYPE;
@ -1482,6 +1520,8 @@ void amf_ue_remove(amf_ue_t *amf_ue)
ogs_timer_delete(amf_ue->t3555.timer);
ogs_timer_delete(amf_ue->t3560.timer);
ogs_timer_delete(amf_ue->t3570.timer);
ogs_timer_delete(amf_ue->mobile_reachable.timer);
ogs_timer_delete(amf_ue->implicit_deregistration.timer);
/* Free SBI object memory */
ogs_sbi_object_free(&amf_ue->sbi);
@ -1827,6 +1867,18 @@ void amf_ue_associate_ran_ue(amf_ue_t *amf_ue, ran_ue_t *ran_ue)
amf_ue->ran_ue = ran_ue;
ran_ue->amf_ue = amf_ue;
/* Clear mobile_reachable and implicit_deregistration Timers
* TS 24.501
* 5.3.7 Handling of the periodic registration update timer and
* mobile reachable timer
* The mobile reachable timer shall be stopped when a NAS signalling
* connection is established for the UE.
* The implicit de-registration timer shall be stopped when a NAS
* signalling connection is established for the UE.
*/
CLEAR_AMF_UE_TIMER(amf_ue->mobile_reachable);
CLEAR_AMF_UE_TIMER(amf_ue->implicit_deregistration);
}
void ran_ue_deassociate(ran_ue_t *ran_ue)

4
src/amf/context.h
View File

@ -368,6 +368,8 @@ struct amf_ue_s {
CLEAR_AMF_UE_TIMER((__aMF)->t3555); \
CLEAR_AMF_UE_TIMER((__aMF)->t3560); \
CLEAR_AMF_UE_TIMER((__aMF)->t3570); \
CLEAR_AMF_UE_TIMER((__aMF)->mobile_reachable); \
CLEAR_AMF_UE_TIMER((__aMF)->implicit_deregistration); \
} while(0);
#define CLEAR_AMF_UE_TIMER(__aMF_UE_TIMER) \
do { \
@ -382,7 +384,7 @@ struct amf_ue_s {
ogs_pkbuf_t *pkbuf;
ogs_timer_t *timer;
uint32_t retry_count;;
} t3513, t3522, t3550, t3555, t3560, t3570;
} t3513, t3522, t3550, t3555, t3560, t3570, mobile_reachable, implicit_deregistration;
/* UE Radio Capability */
OCTET_STRING_t ueRadioCapability;

64
src/amf/gmm-sm.c
View File

@ -197,11 +197,24 @@ void gmm_state_de_registered(ogs_fsm_t *s, amf_event_t *e)
ogs_free(amf_ue->data_change_subscription_id);
amf_ue->data_change_subscription_id = NULL;
}
ogs_assert(true ==
amf_ue_sbi_discover_and_send(
OGS_SBI_SERVICE_TYPE_NAUSF_AUTH, NULL,
amf_nausf_auth_build_authenticate_delete,
amf_ue, NULL));
if (amf_ue->network_initiated_de_reg) {
amf_sbi_send_release_all_sessions(
amf_ue, AMF_RELEASE_SM_CONTEXT_NO_STATE);
if ((ogs_list_count(&amf_ue->sess_list) == 0) &&
(PCF_AM_POLICY_ASSOCIATED(amf_ue)))
{
ogs_assert(true ==
amf_ue_sbi_discover_and_send(
OGS_SBI_SERVICE_TYPE_NPCF_AM_POLICY_CONTROL, NULL,
amf_npcf_am_policy_control_build_delete, amf_ue, NULL));
}
} else {
ogs_assert(true ==
amf_ue_sbi_discover_and_send(
OGS_SBI_SERVICE_TYPE_NAUSF_AUTH, NULL,
amf_nausf_auth_build_authenticate_delete,
amf_ue, NULL));
}
break;
DEFAULT
ogs_warn("Ignoring invalid resource name [%s]",
@ -274,6 +287,7 @@ void gmm_state_de_registered(ogs_fsm_t *s, amf_event_t *e)
ogs_assert(OGS_OK ==
nas_5gs_send_de_registration_accept(amf_ue));
amf_ue->network_initiated_de_reg = false;
PCF_AM_POLICY_CLEAR(amf_ue);
break;
@ -403,6 +417,46 @@ void gmm_state_registered(ogs_fsm_t *s, amf_event_t *e)
}
break;
case AMF_TIMER_MOBILE_REACHABLE:
ogs_info("[%s] Mobile Reachable timer expired", amf_ue->supi);
/* Clear mobile_reachable Timers */
CLEAR_AMF_UE_TIMER(amf_ue->mobile_reachable);
/* Start AMF_TIMER_IMPLICIT_DEREGISTRATION
* TS 24.501
* 5.3.7 Handling of the periodic registration update timer and
* mobile reachable timer
* Upon expiry of the mobile reachable timer the network shall
* start the implicit de-registration timer over 3GPP access.
* The default value of the implicit de-registration timer over
* 3GPP access is 4 minutes greater than the value of timer T3512.
*/
ogs_timer_start(amf_ue->implicit_deregistration.timer,
ogs_time_from_sec(amf_self()->time.t3512.value + 240));
break;
case AMF_TIMER_IMPLICIT_DEREGISTRATION:
ogs_info("[%s] Implicit de-reg timer expired, de-register UE",
amf_ue->supi);
/* Clear implicit_deregistration Timers */
CLEAR_AMF_UE_TIMER(amf_ue->implicit_deregistration);
/* Implicitly de-register UE
* TS 24.501
* 5.3.7 Handling of the periodic registration update timer and
* mobile reachable timer
* If the implicit de-registration timer expires before the UE
* contacts the network, the network shall implicitly de-register
* the UE.
* TS 23.502
* 4.2.2.3.3 Network-initiated Deregistration
* The AMF does not send the Deregistration Request message to the UE
* for Implicit Deregistration.
*/
ogs_assert(true == amf_ue_sbi_discover_and_send(
OGS_SBI_SERVICE_TYPE_NUDM_SDM, NULL,
amf_nudm_sdm_build_subscription_delete, amf_ue, NULL));
amf_ue->network_initiated_de_reg = true;
amf_ue->rm_state = RM_STATE_DEREGISTERED;
OGS_FSM_TRAN(s, &gmm_state_de_registered);
break;
default:
ogs_error("Unknown timer[%s:%d]",
amf_timer_get_name(e->h.timer_id), e->h.timer_id);

24
src/amf/ngap-path.c
View File

@ -369,6 +369,30 @@ int ngap_send_paging(amf_ue_t *amf_ue)
int i, j;
int rv;
if (amf_ue->implicit_deregistration.timer->running) {
/* Mobile Reachable timer has expired if implicit de-registration
* timer is running
* TS 24.501
* 5.3.7 Handling of the periodic registration update timer and
* mobile reachable timer
* The network behaviour upon expiry of the mobile reachable timer
* is network dependent, but typically the network stops sending
* paging messages to the UE on the first expiry
*/
ogs_info("[%s] Paging ignored due to Mobile Reachable timer expiration",
amf_ue->supi);
/* Clear Paging Info */
AMF_UE_CLEAR_PAGING_INFO(amf_ue);
/* Clear N2 Transfer */
AMF_UE_CLEAR_N2_TRANSFER(
amf_ue, pdu_session_resource_setup_request);
/* Clear 5GSM Message */
AMF_UE_CLEAR_5GSM_MESSAGE(amf_ue);
return OGS_OK;
}
ogs_list_for_each(&amf_self()->gnb_list, gnb) {
for (i = 0; i < gnb->num_of_supported_ta_list; i++) {
for (j = 0; j < gnb->supported_ta_list[i].num_of_bplmn_list; j++) {

14
src/amf/timer.c
View File

@ -93,6 +93,10 @@ const char *amf_timer_get_name(int timer_id)
return "AMF_TIMER_T3570";
case AMF_TIMER_NG_HOLDING:
return "AMF_TIMER_NG_HOLDING";
case AMF_TIMER_MOBILE_REACHABLE:
return "AMF_TIMER_MOBILE_REACHABLE";
case AMF_TIMER_IMPLICIT_DEREGISTRATION:
return "AMF_TIMER_IMPLICIT_DEREGISTRATION";
default:
break;
}
@ -183,3 +187,13 @@ void amf_timer_ng_holding_timer_expire(void *data)
ogs_event_free(e);
}
}
void amf_timer_mobile_reachable_expire(void *data)
{
gmm_timer_event_send(AMF_TIMER_MOBILE_REACHABLE, data);
}
void amf_timer_implicit_deregistration_expire(void *data)
{
gmm_timer_event_send(AMF_TIMER_IMPLICIT_DEREGISTRATION, data);
}

5
src/amf/timer.h
View File

@ -39,6 +39,8 @@ typedef enum {
AMF_TIMER_T3555,
AMF_TIMER_T3560,
AMF_TIMER_T3570,
AMF_TIMER_MOBILE_REACHABLE,
AMF_TIMER_IMPLICIT_DEREGISTRATION,
MAX_NUM_OF_AMF_TIMER,
@ -65,6 +67,9 @@ void amf_timer_t3570_expire(void *data);
void amf_timer_ng_holding_timer_expire(void *data);
void amf_timer_mobile_reachable_expire(void *data);
void amf_timer_implicit_deregistration_expire(void *data);
#ifdef __cplusplus
}
#endif