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implementation of S1 E-RAB Release Indication and Error Indication messages

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master
Francisco 4 years ago committed by Francisco Paisana
parent ac62e3c398
commit d64ce7df77
4 changed files with 119 additions and 11 deletions
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6
lib/include/srslte/interfaces/enb_interfaces.h
Unescape Escape View File

@ -551,6 +551,12 @@ public:
* SeNB --> MME
*/
virtual void send_ho_cancel(uint16_t rnti) = 0;
/**
* Called during release of a subset of eNB E-RABs. Send E-RAB RELEASE INDICATION to MME.
* SeNB --> MME
*/
virtual bool release_erabs(uint16_t rnti, const std::vector<uint16_t>& erabs_successfully_released) = 0;
};
// Combined interface for PHY to access stack (MAC and RRC)

4
srsenb/hdr/stack/upper/s1ap.h
Unescape Escape View File

@ -82,6 +82,8 @@ public:
void send_ho_notify(uint16_t rnti, uint64_t target_eci) override;
void send_ho_cancel(uint16_t rnti) override;
// void ue_capabilities(uint16_t rnti, LIBLTE_RRC_UE_EUTRA_CAPABILITY_STRUCT *caps);
bool release_erabs(uint16_t rnti, const std::vector<uint16_t>& erabs_successfully_released) override;
bool send_error_indication(uint16_t rnti, const asn1::s1ap::cause_c& cause);
// Stack interface
bool
@ -197,6 +199,8 @@ private:
const std::vector<uint16_t>& erabs_failed_to_release);
bool send_erab_modify_response(const std::vector<uint16_t>& erabs_successfully_released,
const std::vector<uint16_t>& erabs_failed_to_release);
bool send_erab_release_indication(const std::vector<uint16_t>& erabs_successfully_released);
bool was_uectxtrelease_requested() const { return release_requested; }
ue_ctxt_t ctxt = {};

110
srsenb/src/stack/upper/s1ap.cc
Unescape Escape View File

@ -533,6 +533,9 @@ bool s1ap::handle_s1ap_rx_pdu(srslte::byte_buffer_t* pdu)
if (rx_pdu.unpack(bref) != asn1::SRSASN_SUCCESS) {
logger.error("Failed to unpack received PDU");
cause_c cause;
cause.set_protocol().value = cause_protocol_opts::transfer_syntax_error;
send_error_indication(SRSLTE_INVALID_RNTI, cause);
return false;
}
@ -732,6 +735,13 @@ bool s1ap::handle_erabmodifyrequest(const erab_modify_request_s& msg)
return true;
}
/**
* @brief eNB handles MME's message "E-RAB RELEASE COMMAND"
* @remark TS 36.413, Section 8.2.3.2 - E-RAB Release - MME initiated (successful operation)
* @param erabs_successfully_released
* @param erabs_failed_to_release
* @return true if message was sent
*/
bool s1ap::handle_erabreleasecommand(const erab_release_cmd_s& msg)
{
logger.info("Received ERABReleaseCommand");
@ -1040,6 +1050,46 @@ void s1ap::send_ho_cancel(uint16_t rnti)
sctp_send_s1ap_pdu(tx_pdu, rnti, "HandoverCancel");
}
bool s1ap::release_erabs(uint16_t rnti, const std::vector<uint16_t>& erabs_successfully_released)
{
ue* user_ptr = users.find_ue_rnti(rnti);
if (user_ptr == nullptr) {
return false;
}
return user_ptr->send_erab_release_indication(erabs_successfully_released);
}
bool s1ap::send_error_indication(uint16_t rnti, const asn1::s1ap::cause_c& cause)
{
if (not mme_connected) {
return false;
}
s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_ERROR_IND);
auto& container = tx_pdu.init_msg().value.error_ind().protocol_ies;
if (rnti != SRSLTE_INVALID_RNTI) {
ue* user_ptr = users.find_ue_rnti(rnti);
if (user_ptr == nullptr) {
return false;
}
container.enb_ue_s1ap_id_present = true;
container.enb_ue_s1ap_id.value = user_ptr->ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id_present = user_ptr->ctxt.mme_ue_s1ap_id_present;
if (user_ptr->ctxt.mme_ue_s1ap_id_present) {
container.mme_ue_s1ap_id.value = user_ptr->ctxt.mme_ue_s1ap_id;
}
}
container.s_tmsi_present = false;
container.cause_present = true;
container.cause.value = cause;
return sctp_send_s1ap_pdu(tx_pdu, rnti, "Error Indication");
}
/*******************************************************************************
/* S1AP message senders
********************************************************************************/
@ -1268,6 +1318,13 @@ bool s1ap::ue::send_uectxtmodifyfailure(const cause_c& cause)
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "UEContextModificationFailure");
}
/**
* @brief eNB sends MME to "E-RAB RELEASE RESPONSE"
* @remark TS 36.413, Section 8.2.3.2 - E-RAB Release - MME initiated (successful operation)
* @param erabs_successfully_released
* @param erabs_failed_to_release
* @return true if message was sent
*/
bool s1ap::ue::send_erab_release_response(const std::vector<uint16_t>& erabs_successfully_released,
const std::vector<uint16_t>& erabs_failed_to_release)
{
@ -1350,6 +1407,34 @@ bool s1ap::ue::send_erab_modify_response(const std::vector<uint16_t>& erabs_succ
return s1ap_ptr->sctp_send_s1ap_pdu(tx_pdu, ctxt.rnti, "E_RABReleaseResponse");
}
bool s1ap::ue::send_erab_release_indication(const std::vector<uint16_t>& erabs_successfully_released)
{
if (not s1ap_ptr->mme_connected) {
return false;
}
if (not erabs_successfully_released.empty()) {
logger.error("Failed to initiate E-RAB RELEASE INDICATION procedure for user rnti=0x%x", ctxt.rnti);
return false;
}
asn1::s1ap::s1ap_pdu_c tx_pdu;
tx_pdu.set_init_msg().load_info_obj(ASN1_S1AP_ID_ERAB_RELEASE_IND);
erab_release_ind_ies_container& container = tx_pdu.init_msg().value.erab_release_ind().protocol_ies;
container.enb_ue_s1ap_id.value = ctxt.enb_ue_s1ap_id;
container.mme_ue_s1ap_id.value = ctxt.mme_ue_s1ap_id;
// Fill in which E-RABs were successfully released
container.erab_released_list.value.resize(erabs_successfully_released.size());
for (size_t i = 0; i < container.erab_released_list.value.size(); ++i) {
container.erab_released_list.value[i].load_info_obj(ASN1_S1AP_ID_ERAB_ITEM);
container.erab_released_list.value[i].value.erab_item().erab_id = erabs_successfully_released[i];
}
return true;
}
/*********************
* Handover Messages
********************/
@ -1539,16 +1624,27 @@ bool s1ap::sctp_send_s1ap_pdu(const asn1::s1ap::s1ap_pdu_c& tx_pdu, uint32_t rnt
s1ap::ue* s1ap::find_s1apmsg_user(uint32_t enb_id, uint32_t mme_id)
{
ue* user_ptr = users.find_ue_enbid(enb_id);
if (user_ptr == nullptr) {
logger.warning("enb_ue_s1ap_id=%d not found - discarding message", enb_id);
return nullptr;
}
if (user_ptr->ctxt.mme_ue_s1ap_id_present and user_ptr->ctxt.mme_ue_s1ap_id != mme_id) {
logger.warning("MME_UE_S1AP_ID has changed - old:%d, new:%d", user_ptr->ctxt.mme_ue_s1ap_id, mme_id);
}
cause_c cause;
if (user_ptr != nullptr) {
if (not user_ptr->ctxt.mme_ue_s1ap_id_present or user_ptr->ctxt.mme_ue_s1ap_id != mme_id) {
if (not user_ptr->ctxt.mme_ue_s1ap_id_present) {
user_ptr->ctxt.mme_ue_s1ap_id_present = true;
user_ptr->ctxt.mme_ue_s1ap_id = mme_id;
}
return user_ptr;
} else {
logger.warning("MME UE S1AP ID=%d not found - discarding message", enb_id);
cause.set_radio_network().value = cause_radio_network_opts::unknown_mme_ue_s1ap_id;
}
} else {
logger.warning("ENB UE S1AP ID=%d not found - discarding message", enb_id);
cause.set_radio_network().value = users.find_ue_mmeid(mme_id) != nullptr
? cause_radio_network_opts::unknown_enb_ue_s1ap_id
: cause_radio_network_opts::unknown_pair_ue_s1ap_id;
}
logger.warning("ENB UE S1AP ID=%d not found - discarding message", enb_id);
send_error_indication(SRSLTE_INVALID_RNTI, cause);
return nullptr;
}
std::string s1ap::get_cause(const cause_c& c)

2
srsenb/test/common/dummy_classes.h
Unescape Escape View File

@ -115,6 +115,8 @@ public:
void send_ho_notify(uint16_t rnti, uint64_t target_eci) override {}
void send_ho_cancel(uint16_t rnti) override {}
bool release_erabs(uint16_t rnti, const std::vector<uint16_t>& erabs_successfully_released) override { return true; }
};
class phy_dummy : public phy_interface_rrc_lte

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