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Implicit S1 Release

This commit is contained in:
Sukchan Lee 2018-01-29 19:10:54 +09:00
parent b704e94efa
commit 795ecc8cf8
6 changed files with 116 additions and 38 deletions
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40
src/mme/mme_context.c
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@ -75,7 +75,8 @@ status_t mme_context_init()
self.guti_ue_hash = hash_make();
/* Timer value */
self.t3413_value = 2; /* Paging retry Timer: 2 secs */
self.t3413_value = 2; /* Paging retry timer: 2 secs */
self.s1_holding_timer_value = 30; /* S1 holding timer: 30 secs */
context_initialized = 1;
@ -1718,6 +1719,12 @@ enb_ue_t* enb_ue_add(mme_enb_t *enb)
sizeof(enb_ue->mme_ue_s1ap_id), enb_ue);
list_append(&enb->enb_ue_list, enb_ue);
/* Create S1 holding timer */
enb_ue->holding_timer = timer_create(&self.tm_service,
MME_EVT_S1AP_S1_HOLDING_TIMER, self.s1_holding_timer_value * 1000);
d_assert(enb_ue->holding_timer, return NULL, "Null param");
timer_set_param1(enb_ue->holding_timer, enb_ue->index);
return enb_ue;
}
@ -1730,10 +1737,19 @@ unsigned int enb_ue_count()
status_t enb_ue_remove(enb_ue_t *enb_ue)
{
status_t rv;
d_assert(self.mme_ue_s1ap_id_hash, return CORE_ERROR, "Null param");
d_assert(enb_ue, return CORE_ERROR, "Null param");
d_assert(enb_ue->enb, return CORE_ERROR, "Null param");
/* De-associate S1 with NAS/EMM */
rv = enb_ue_deassociate(enb_ue);
d_assert(rv == CORE_OK,,);
/* Delete All Timers */
tm_delete(enb_ue->holding_timer);
list_remove(&enb_ue->enb->enb_ue_list, enb_ue);
hash_set(self.mme_ue_s1ap_id_hash, &enb_ue->mme_ue_s1ap_id,
sizeof(enb_ue->mme_ue_s1ap_id), NULL);
@ -1840,7 +1856,7 @@ mme_ue_t* mme_ue_add(enb_ue_t *enb_ue)
mme_self()->sgw = list_next(mme_self()->sgw);
/* Create t3413 timer */
/* Create paging retry timer */
mme_ue->t3413 = timer_create(&self.tm_service, MME_EVT_EMM_T3413,
self.t3413_value * 1000);
d_assert(mme_ue->t3413, return NULL, "Null param");
@ -1855,6 +1871,7 @@ mme_ue_t* mme_ue_add(enb_ue_t *enb_ue)
status_t mme_ue_remove(mme_ue_t *mme_ue)
{
status_t rv;
event_t e;
d_assert(mme_ue, return CORE_ERROR, "Null param");
@ -1895,6 +1912,9 @@ status_t mme_ue_remove(mme_ue_t *mme_ue)
/* Delete All Timers */
tm_delete(mme_ue->t3413);
rv = mme_ue_deassociate(mme_ue);
d_assert(rv == CORE_OK,,);
mme_sess_remove_all(mme_ue);
mme_pdn_remove_all(mme_ue);
@ -2172,17 +2192,19 @@ status_t mme_ue_associate_enb_ue(mme_ue_t *mme_ue, enb_ue_t *enb_ue)
return CORE_OK;
}
status_t mme_ue_deassociate_enb_ue(enb_ue_t *enb_ue)
status_t enb_ue_deassociate(enb_ue_t *enb_ue)
{
mme_ue_t *mme_ue = NULL;
d_assert(enb_ue, return CORE_ERROR, "Null param");
mme_ue = enb_ue->mme_ue;
d_assert(mme_ue, return CORE_ERROR, "Null param");
mme_ue->enb_ue = NULL;
enb_ue->mme_ue = NULL;
return CORE_OK;
}
status_t mme_ue_deassociate(mme_ue_t *mme_ue)
{
d_assert(mme_ue, return CORE_ERROR, "Null param");
mme_ue->enb_ue = NULL;
return CORE_OK;
}

30
src/mme/mme_context.h
View File

@ -108,7 +108,8 @@ typedef struct _mme_context_t {
c_uint8_t relative_capacity;
/* Timer value */
c_uint32_t t3413_value; /* Paging retry timer */
c_uint32_t t3413_value; /* Paging retry timer value */
c_uint32_t s1_holding_timer_value; /* S1 holding timer value */
/* Generator for unique identification */
c_uint32_t mme_ue_s1ap_id; /* mme_ue_s1ap_id generator */
@ -180,6 +181,23 @@ struct _enb_ue_t {
#define S1AP_UE_CTX_REL_DELETE_INDIRECT_TUNNEL 3
c_uint8_t ue_ctx_rel_action;
/*
* S1 holding timer
*
* When eNodeB sends Attach Request, TAU Request, Service Request repeatly,
* S1(enb_ue_t) context is repeatly created.
*
* NAS(mme_ue_t) context is associated with last created S1(enb_ue_t)
* context, and older S1(enb_ue_t) context might not be freed.
*
* If NAS(mme_ue_t) has already been associated with
* older S1(enb_ue_t) context, the holding timer(30secs) is started.
* Newly associated S1(enb_ue_t) context holding timer is stopped.
*
* If the holding timer expires, S1(enb_ue_t) context will be deleted.
*/
tm_block_id holding_timer;
/* Related Context */
mme_enb_t *enb;
mme_ue_t *mme_ue;
@ -509,19 +527,16 @@ CORE_DECLARE(status_t) mme_ue_set_imsi(
*
* o RECV Initial Context Setup Failure in EMM Registered State
* ### MME_UE_DEASSOCIATE_ENB_UE() ###
* ### MME_UE_ECM_IDLE() ###
* ### ENB_UE_REMOVE() ###
* ### MME_UE_DEASSOCIATE() ###
*
* o SEND UE Context Release Command with NO_ACTION
* - RECV UE Context Release Complete
* ### MME_UE_DEASSOCIATE_ENB_UE() ###
* ### MME_UE_ECM_IDLE() ###
* ### ENB_UE_REMOVE() ###
* ### MME_UE_DEASSOCIATE() ###
*
* o SEND UE Context Release Command with REMOVE_MME_UE_CONTEXT
* - RECV UE Context Release Complete
* ### MME_UE_DEASSOCIATE_ENB_UE() ###
* ### MME_UE_ECM_IDLE() ###
* ### ENB_UE_REMOVE() ###
* ### MME_UE_REMOVE() ###
*
@ -553,7 +568,8 @@ CORE_DECLARE(status_t) mme_ue_set_imsi(
*/
CORE_DECLARE(status_t) mme_ue_associate_enb_ue(
mme_ue_t *mme_ue, enb_ue_t *enb_ue);
CORE_DECLARE(status_t) mme_ue_deassociate_enb_ue(enb_ue_t *enb_ue);
CORE_DECLARE(status_t) enb_ue_deassociate(enb_ue_t *enb_ue);
CORE_DECLARE(status_t) mme_ue_deassociate(mme_ue_t *mme_ue);
CORE_DECLARE(status_t) source_ue_associate_target_ue(
enb_ue_t *source_ue, enb_ue_t *target_ue);
CORE_DECLARE(status_t) source_ue_deassociate_target_ue(enb_ue_t *enb_ue);

4
src/mme/mme_event.c
View File

@ -23,7 +23,9 @@ char* mme_event_get_name(event_t *e)
case MME_EVT_S1AP_LO_ACCEPT:
return "MME_EVT_S1AP_LO_ACCEPT";
case MME_EVT_S1AP_LO_CONNREFUSED:
return"MME_EVT_S1AP_LO_CONNREFUSED";
return "MME_EVT_S1AP_LO_CONNREFUSED";
case MME_EVT_S1AP_S1_HOLDING_TIMER:
return "MME_EVT_S1AP_S1_HOLDING_TIMER";
case MME_EVT_EMM_MESSAGE:
return "MME_EVT_EMM_MESSAGE";

1
src/mme/mme_event.h
View File

@ -17,6 +17,7 @@ typedef enum {
MME_EVT_S1AP_DELAYED_SEND,
MME_EVT_S1AP_LO_ACCEPT,
MME_EVT_S1AP_LO_CONNREFUSED,
MME_EVT_S1AP_S1_HOLDING_TIMER,
MME_EVT_EMM_MESSAGE,
MME_EVT_EMM_T3413,

47
src/mme/mme_sm.c
View File

@ -212,6 +212,36 @@ void mme_state_operational(fsm_t *s, event_t *e)
tm_delete(timer);
break;
}
case MME_EVT_S1AP_S1_HOLDING_TIMER:
{
enb_ue_t *enb_ue = NULL;
mme_ue_t *mme_ue = NULL;
enb_ue = enb_ue_find(event_get_param1(e));
d_assert(enb_ue, break, "No ENB UE context");
d_warn("Implicit S1 release");
d_warn(" ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]",
enb_ue->enb_ue_s1ap_id, enb_ue->mme_ue_s1ap_id);
mme_ue = enb_ue->mme_ue;
d_assert(mme_ue, break, "No MME UE context");
d_warn("Associated NAS/EMM");
d_warn(" GUTI[G:%d,C:%d,M_TMSI:0x%x] IMSI[%s]",
mme_ue->guti.mme_gid,
mme_ue->guti.mme_code,
mme_ue->guti.m_tmsi,
MME_UE_HAVE_IMSI(mme_ue) ? mme_ue->imsi_bcd : "Unknown");
if (mme_ue->enb_ue)
d_warn(" ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]",
mme_ue->enb_ue->enb_ue_s1ap_id,
mme_ue->enb_ue->mme_ue_s1ap_id);
else
d_warn(" No Associated S1");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,,);
break;
}
case MME_EVT_EMM_MESSAGE:
{
nas_message_t message;
@ -257,16 +287,21 @@ void mme_state_operational(fsm_t *s, event_t *e)
"nas_security_decode failed");
}
}
#if 0 /* FIXME : how can we release S1(enb_ue_t) context ? */
/* If NAS(mme_ue_t) has already been associated with
* older S1(enb_ue_t) context, the holding timer(30secs)
* is started. Newly associated S1(enb_ue_t) context
* holding timer is stopped. */
if (mme_ue->enb_ue)
{
d_warn("Implicitly S1 released");
d_warn("Start S1 holding timer");
d_warn(" ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]",
mme_ue->enb_ue->enb_ue_s1ap_id,
mme_ue->enb_ue->mme_ue_s1ap_id);
enb_ue_remove(mme_ue->enb_ue);
mme_ue->enb_ue->enb_ue_s1ap_id,
mme_ue->enb_ue->mme_ue_s1ap_id);
tm_start(mme_ue->enb_ue->holding_timer);
}
#endif
tm_stop(enb_ue->holding_timer);
mme_ue_associate_enb_ue(mme_ue, enb_ue);
}
else

32
src/mme/s1ap_handler.c
View File

@ -156,16 +156,21 @@ void s1ap_handle_initial_ue_message(mme_enb_t *enb, s1ap_message_t *message)
mme_ue->guti.m_tmsi,
MME_UE_HAVE_IMSI(mme_ue)
? mme_ue->imsi_bcd : "Unknown");
#if 0 /* FIXME : how can we release S1(enb_ue_t) context ? */
/* If NAS(mme_ue_t) has already been associated with
* older S1(enb_ue_t) context, the holding timer(30secs)
* is started. Newly associated S1(enb_ue_t) context
* holding timer is stopped. */
if (mme_ue->enb_ue)
{
d_warn("Implicitly S1 released");
d_warn("Start S1 holding timer");
d_warn(" ENB_UE_S1AP_ID[%d] MME_UE_S1AP_ID[%d]",
mme_ue->enb_ue->enb_ue_s1ap_id,
mme_ue->enb_ue->mme_ue_s1ap_id);
enb_ue_remove(mme_ue->enb_ue);
mme_ue->enb_ue->enb_ue_s1ap_id,
mme_ue->enb_ue->mme_ue_s1ap_id);
tm_start(mme_ue->enb_ue->holding_timer);
}
#endif
tm_stop(enb_ue->holding_timer);
mme_ue_associate_enb_ue(mme_ue, enb_ue);
}
}
@ -392,12 +397,11 @@ void s1ap_handle_initial_context_setup_failure(
#if 1 /* Implicit Release */
d_trace(5, " Implicit Release\n");
rv = mme_ue_deassociate_enb_ue(enb_ue);
d_assert(rv == CORE_OK,, "mme_ue_deassociate_enb_ue() failed");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_remove() failed");
rv = mme_ue_deassociate(mme_ue);
d_assert(rv == CORE_OK,, "enb_ue_remove() failed");
#else /* Explicit Release */
d_trace(5, " Explicit Release\n");
@ -669,19 +673,17 @@ void s1ap_handle_ue_context_release_complete(
case S1AP_UE_CTX_REL_NO_ACTION:
{
d_trace(5, " No Action\n");
rv = mme_ue_deassociate_enb_ue(enb_ue);
d_assert(rv == CORE_OK,, "mme_ue_deassociate_enb_ue() failed");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_remove() failed");
d_assert(mme_ue,,);
rv = mme_ue_deassociate(mme_ue);
d_assert(rv == CORE_OK,, "enb_ue_remove() failed");
break;
}
case S1AP_UE_CTX_REL_REMOVE_MME_UE_CONTEXT:
{
d_trace(5, " Action: UE(mme) context\n");
rv = mme_ue_deassociate_enb_ue(enb_ue);
d_assert(rv == CORE_OK,, "mme_ue_deassociate_enb_ue() failed");
rv = enb_ue_remove(enb_ue);
d_assert(rv == CORE_OK,, "enb_ue_removeI() failed");