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Changed s1ap_ctx_mngmt_proc. Starting to address s1ap_nas_transport.

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master
Pedro Alvarez 6 years ago
parent e9528155b5
commit 40d53f8f45
1 changed files with 20 additions and 25 deletions
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43
srsepc/src/mme/s1ap_ctx_mngmt_proc.cc
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@ -241,49 +241,45 @@ s1ap_ctx_mngmt_proc::handle_initial_context_setup_response(LIBLTE_S1AP_MESSAGE_I
bool
s1ap_ctx_mngmt_proc::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT *ue_rel, struct sctp_sndrcvinfo *enb_sri, srslte::byte_buffer_t *reply_buffer, bool *reply_flag)
{
LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASEREQUEST_STRUCT ue_rel_req;
uint32_t mme_ue_s1ap_id = ue_rel->MME_UE_S1AP_ID.MME_UE_S1AP_ID;
m_s1ap_log->info("Received UE Context Release Request. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("Received UE Context Release Request. MME-UE S1AP Id %d\n", mme_ue_s1ap_id);
ue_ctx_t * ue_ctx = m_s1ap->find_ue_ctx_from_mme_ue_s1ap_id(mme_ue_s1ap_id);
if(ue_ctx == NULL)
{
nas * nas_ctx = m_s1ap->find_nas_ctx_from_mme_ue_s1ap_id(mme_ue_s1ap_id);
if (nas_ctx == NULL) {
m_s1ap_log->info("No UE context to release found. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("No UE context to release found. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
return false;
}
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
emm_ctx_t *emm_ctx = &nas_ctx->m_emm_ctx;
ecm_ctx_t *ecm_ctx = &nas_ctx->m_ecm_ctx;
//Delete user plane context at the SPGW (but keep GTP-C connection).
if (ecm_ctx->state == ECM_STATE_CONNECTED)
{
if (ecm_ctx->state == ECM_STATE_CONNECTED) {
//There are active E-RABs, send release access mearers request
m_s1ap_log->console("There are active E-RABs, send release access mearers request\n");
m_s1ap_log->info("There are active E-RABs, send release access mearers request\n");
//The handle_release_access_bearers_response function will make sure to mark E-RABS DEACTIVATED
//It will release the UEs downstream S1-u and keep the upstream S1-U connection active.
m_mme_gtpc->send_release_access_bearers_request(ecm_ctx->imsi);
m_mme_gtpc->send_release_access_bearers_request(emm_ctx->imsi);
//Send release context command to enb, so that it can release it's bearers
send_ue_context_release_command(ecm_ctx,reply_buffer);
}
else
{
} else {
//No ECM Context to release
m_s1ap_log->info("UE is not ECM connected. No need to release S1-U. MME UE S1AP Id %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("UE is not ECM connected. No need to release S1-U. MME UE S1AP Id %d\n", mme_ue_s1ap_id);
//Make sure E-RABS are merked as DEACTIVATED.
for(int i=0;i<MAX_ERABS_PER_UE;i++)
{
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
for (int i=0;i<MAX_ERABS_PER_UE;i++) {
nas_ctx->m_esm_ctx[i].state = ERAB_DEACTIVATED;
}
}
//Delete UE context
//Set UE context to ECM Idle
ecm_ctx->state = ECM_STATE_IDLE;
ecm_ctx->enb_ue_s1ap_id = 0;
ecm_ctx->mme_ue_s1ap_id = 0;
@ -293,7 +289,7 @@ s1ap_ctx_mngmt_proc::handle_ue_context_release_request(LIBLTE_S1AP_MESSAGE_UECON
}
bool
s1ap_ctx_mngmt_proc::send_ue_context_release_command(ue_ecm_ctx_t *ecm_ctx, srslte::byte_buffer_t *reply_buffer)
s1ap_ctx_mngmt_proc::send_ue_context_release_command(ecm_ctx_t *ecm_ctx, srslte::byte_buffer_t *reply_buffer)
{
//Prepare reply PDU
LIBLTE_S1AP_S1AP_PDU_STRUCT pdu;
@ -330,26 +326,25 @@ s1ap_ctx_mngmt_proc::send_ue_context_release_command(ue_ecm_ctx_t *ecm_ctx, srsl
bool
s1ap_ctx_mngmt_proc::handle_ue_context_release_complete(LIBLTE_S1AP_MESSAGE_UECONTEXTRELEASECOMPLETE_STRUCT *rel_comp)
{
uint32_t mme_ue_s1ap_id = rel_comp->MME_UE_S1AP_ID.MME_UE_S1AP_ID;
m_s1ap_log->info("Received UE Context Release Complete. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("Received UE Context Release Complete. MME-UE S1AP Id %d\n", mme_ue_s1ap_id);
ue_ctx_t * ue_ctx = m_s1ap->find_ue_ctx_from_mme_ue_s1ap_id(mme_ue_s1ap_id);
if(ue_ctx == NULL)
{
nas * nas_ctx = m_s1ap->find_nas_ctx_from_mme_ue_s1ap_id(mme_ue_s1ap_id);
if (nas_ctx == NULL) {
m_s1ap_log->info("No UE context to release found. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
m_s1ap_log->console("No UE context to release found. MME-UE S1AP Id: %d\n", mme_ue_s1ap_id);
return false;
}
ue_ecm_ctx_t *ecm_ctx = &ue_ctx->ecm_ctx;
emm_ctx_t *emm_ctx = &nas_ctx->m_emm_ctx;
ecm_ctx_t *ecm_ctx = &nas_ctx->m_ecm_ctx;
//Delete user plane context at the SPGW (but keep GTP-C connection).
if (ecm_ctx->state == ECM_STATE_CONNECTED) {
//There are active E-RABs, send release access mearers request
m_s1ap_log->console("There are active E-RABs, send release access mearers request");
m_s1ap_log->info("There are active E-RABs, send release access mearers request");
m_mme_gtpc->send_release_access_bearers_request(ecm_ctx->imsi);
m_mme_gtpc->send_release_access_bearers_request(emm_ctx->imsi);
//The handle_releease_access_bearers_response function will make sure to mark E-RABS DEACTIVATED
//It will release the UEs downstream S1-u and keep the upstream S1-U connection active.
} else {
@ -358,12 +353,12 @@ s1ap_ctx_mngmt_proc::handle_ue_context_release_complete(LIBLTE_S1AP_MESSAGE_UECO
m_s1ap_log->console("UE is not ECM connected. No need to release S1-U. MME UE S1AP Id %d\n", mme_ue_s1ap_id);
//Make sure E-RABS are marked as DEACTIVATED.
for (int i=0;i<MAX_ERABS_PER_UE;i++) {
ecm_ctx->erabs_ctx[i].state = ERAB_DEACTIVATED;
nas_ctx->m_esm_ctx[i].state = ERAB_DEACTIVATED;
}
}
//Delete UE context
m_s1ap->release_ue_ecm_ctx(ue_ctx->ecm_ctx.mme_ue_s1ap_id);
m_s1ap->release_ue_ecm_ctx(nas_ctx->m_ecm_ctx.mme_ue_s1ap_id);
m_s1ap_log->info("UE Context Release Completed.\n");
m_s1ap_log->console("UE Context Release Completed.\n");
return true;

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