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@ -380,7 +380,9 @@ bool rrc::ue::rrc_mobility::start_ho_preparation(uint32_t target_eci,
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* @param is_success flag to whether an HandoverCommand or HandoverReject was received
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* @param container RRC container with HandoverCommand to send to UE
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*/
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void rrc::ue::rrc_mobility::handle_ho_preparation_complete(bool is_success, srslte::unique_byte_buffer_t container)
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void rrc::ue::rrc_mobility::handle_ho_preparation_complete(bool is_success,
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const asn1::s1ap::ho_cmd_s& msg,
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srslte::unique_byte_buffer_t container)
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{
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if (not is_success) {
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log_h->info("Received S1AP HandoverFailure. Aborting Handover...");
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@ -405,7 +407,7 @@ void rrc::ue::rrc_mobility::handle_ho_preparation_complete(bool is_success, srsl
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return;
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}
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trigger(rrchocmd.crit_exts.c1().ho_cmd_r8());
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trigger(s1_source_ho_st::ho_cmd_msg{&msg, &rrchocmd.crit_exts.c1().ho_cmd_r8()});
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}
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bool rrc::ue::rrc_mobility::start_s1_tenb_ho(
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@ -476,12 +478,46 @@ void rrc::ue::rrc_mobility::fill_mobility_reconf_common(asn1::rrc::dl_dcch_msg_s
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true);
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}
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/*************************************
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* rrc_mobility FSM methods
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*************************************/
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bool rrc::ue::rrc_mobility::needs_s1_ho(idle_st& s, const ho_meas_report_ev& meas_result)
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{
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if (rrc_ue->get_state() != RRC_STATE_REGISTERED) {
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return false;
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}
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return rrc_details::eci_to_enbid(meas_result.target_eci) != rrc_enb->cfg.enb_id;
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}
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bool rrc::ue::rrc_mobility::needs_intraenb_ho(idle_st& s, const ho_meas_report_ev& meas_result)
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{
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if (rrc_ue->get_state() != RRC_STATE_REGISTERED) {
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return false;
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}
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if (rrc_details::eci_to_enbid(meas_result.target_eci) != rrc_enb->cfg.enb_id) {
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return false;
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}
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uint32_t cell_id = rrc_details::eci_to_cellid(meas_result.target_eci);
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return rrc_ue->get_ue_cc_cfg(UE_PCELL_CC_IDX)->cell_cfg.cell_id != cell_id;
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}
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/*************************************
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* s1_source_ho subFSM methods
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*************************************/
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rrc::ue::rrc_mobility::s1_source_ho_st::s1_source_ho_st(rrc_mobility* parent_) :
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base_t(parent_), rrc_enb(parent_->rrc_enb), rrc_ue(parent_->rrc_ue), logger(parent_->logger)
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{}
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/**
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* TS 36.413, Section 8.4.6 - eNB Status Transfer
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* Description: Send "eNBStatusTransfer" message from source eNB to MME
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* - Pass bearers' DL/UL HFN and PDCP SN to be put inside a transparent container
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* @brief: Send "eNBStatusTransfer" message from source eNB to MME, and setup Forwarding GTPU tunnel
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* - PDCP provides the bearers' DL/UL HFN and COUNT to be put inside a transparent container
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* - The eNB sends eNBStatusTransfer to MME
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* - A GTPU forwarding tunnel is opened to forward buffered PDCP PDUs and incoming GTPU PDUs
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*/
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bool rrc::ue::rrc_mobility::start_enb_status_transfer()
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bool rrc::ue::rrc_mobility::s1_source_ho_st::start_enb_status_transfer(const asn1::s1ap::ho_cmd_s& s1ap_ho_cmd)
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{
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std::vector<s1ap_interface_rrc::bearer_status_info> s1ap_bearers;
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s1ap_bearers.reserve(rrc_ue->bearer_list.get_erabs().size());
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@ -503,42 +539,41 @@ bool rrc::ue::rrc_mobility::start_enb_status_transfer()
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}
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Info("PDCP Bearer list sent to S1AP to initiate the eNB Status Transfer");
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return rrc_enb->s1ap->send_enb_status_transfer_proc(rrc_ue->rnti, s1ap_bearers);
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}
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/*************************************
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* rrc_mobility FSM methods
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*************************************/
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bool rrc::ue::rrc_mobility::needs_s1_ho(idle_st& s, const ho_meas_report_ev& meas_result)
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{
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if (rrc_ue->get_state() != RRC_STATE_REGISTERED) {
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if (not rrc_enb->s1ap->send_enb_status_transfer_proc(rrc_ue->rnti, s1ap_bearers)) {
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return false;
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}
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return rrc_details::eci_to_enbid(meas_result.target_eci) != rrc_enb->cfg.enb_id;
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}
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bool rrc::ue::rrc_mobility::needs_intraenb_ho(idle_st& s, const ho_meas_report_ev& meas_result)
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{
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if (rrc_ue->get_state() != RRC_STATE_REGISTERED) {
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return false;
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}
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if (rrc_details::eci_to_enbid(meas_result.target_eci) != rrc_enb->cfg.enb_id) {
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return false;
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// Setup GTPU forwarding tunnel
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if (s1ap_ho_cmd.protocol_ies.erab_subjectto_data_forwarding_list_present) {
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const auto& fwd_erab_list = s1ap_ho_cmd.protocol_ies.erab_subjectto_data_forwarding_list.value;
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const auto& erab_list = rrc_ue->bearer_list.get_erabs();
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for (const auto& e : fwd_erab_list) {
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const auto& fwd_erab = e.value.erab_data_forwarding_item();
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auto it = erab_list.find(fwd_erab.erab_id);
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if (it == erab_list.end()) {
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Warning("E-RAB id=%d subject to forwarding not found\n", fwd_erab.erab_id);
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continue;
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}
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const bearer_cfg_handler::erab_t& erab = it->second;
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if (fwd_erab.dl_g_tp_teid_present and fwd_erab.dl_transport_layer_address_present) {
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gtpu_interface_rrc::bearer_props props;
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props.forward_from_teidin_present = true;
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props.forward_from_teidin = erab.teid_in;
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rrc_ue->bearer_list.add_gtpu_bearer(fwd_erab.erab_id,
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fwd_erab.dl_g_tp_teid.to_number(),
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fwd_erab.dl_transport_layer_address.to_number(),
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&props);
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}
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}
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}
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uint32_t cell_id = rrc_details::eci_to_cellid(meas_result.target_eci);
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return rrc_ue->get_ue_cc_cfg(UE_PCELL_CC_IDX)->cell_cfg.cell_id != cell_id;
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}
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/*************************************
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* s1_source_ho subFSM methods
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*************************************/
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return true;
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}
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void rrc::ue::rrc_mobility::s1_source_ho_st::wait_ho_req_ack_st::enter(s1_source_ho_st* f, const ho_meas_report_ev& ev)
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void rrc::ue::rrc_mobility::s1_source_ho_st::wait_ho_cmd::enter(s1_source_ho_st* f, const ho_meas_report_ev& ev)
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{
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srslte::console("Starting S1 Handover of rnti=0x%x to cellid=0x%x.\n", f->parent_fsm()->rrc_ue->rnti, ev.target_eci);
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f->get_log()->info(
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"Starting S1 Handover of rnti=0x%x to cellid=0x%x.", f->parent_fsm()->rrc_ue->rnti, ev.target_eci);
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srslte::console("Starting S1 Handover of rnti=0x%x to cellid=0x%x.\n", f->rrc_ue->rnti, ev.target_eci);
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f->get_log()->info("Starting S1 Handover of rnti=0x%x to cellid=0x%x.", f->rrc_ue->rnti, ev.target_eci);
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f->report = ev;
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bool success = f->parent_fsm()->start_ho_preparation(f->report.target_eci, f->report.meas_obj->meas_obj_id, false);
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@ -547,65 +582,74 @@ void rrc::ue::rrc_mobility::s1_source_ho_st::wait_ho_req_ack_st::enter(s1_source
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}
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}
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void rrc::ue::rrc_mobility::s1_source_ho_st::send_ho_cmd(wait_ho_req_ack_st& s, const ho_cmd_r8_ies_s& ho_cmd)
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/**
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* TS 36.413, Section 8.4.2 - Handover Resource Allocation
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* @brief: Send "eNBStatusTransfer" message from source eNB to MME, and setup Forwarding GTPU tunnel
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* - PDCP provides the bearers' DL/UL HFN and COUNT to be put inside a transparent container
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* - The eNB sends eNBStatusTransfer to MME
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* - A GTPU forwarding tunnel is opened to forward buffered PDCP PDUs and incoming GTPU PDUs
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*/
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void rrc::ue::rrc_mobility::s1_source_ho_st::handle_ho_cmd(wait_ho_cmd& s, const ho_cmd_msg& ho_cmd)
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{
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/* unpack DL-DCCH message containing the RRCRonnectionReconf (with MobilityInfo) to be sent to the UE */
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asn1::rrc::dl_dcch_msg_s dl_dcch_msg;
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{
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asn1::cbit_ref bref(&ho_cmd.ho_cmd_msg[0], ho_cmd.ho_cmd_msg.size());
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asn1::cbit_ref bref(&ho_cmd.ho_cmd->ho_cmd_msg[0], ho_cmd.ho_cmd->ho_cmd_msg.size());
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if (dl_dcch_msg.unpack(bref) != asn1::SRSASN_SUCCESS) {
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get_log()->warning("Unpacking of RRC DL-DCCH message with HO Command was unsuccessful.");
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Warning("Unpacking of RRC DL-DCCH message with HO Command was unsuccessful.");
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trigger(ho_cancel_ev{});
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return;
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}
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}
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if (dl_dcch_msg.msg.type().value != dl_dcch_msg_type_c::types_opts::c1 or
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dl_dcch_msg.msg.c1().type().value != dl_dcch_msg_type_c::c1_c_::types_opts::rrc_conn_recfg) {
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get_log()->warning("HandoverCommand is expected to contain an RRC Connection Reconf message inside");
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Warning("HandoverCommand is expected to contain an RRC Connection Reconf message inside");
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trigger(ho_cancel_ev{});
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return;
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}
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asn1::rrc::rrc_conn_recfg_s& reconf = dl_dcch_msg.msg.c1().rrc_conn_recfg();
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if (not reconf.crit_exts.c1().rrc_conn_recfg_r8().mob_ctrl_info_present) {
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get_log()->warning("HandoverCommand is expected to have mobility control subfield");
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Warning("HandoverCommand is expected to have mobility control subfield");
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trigger(ho_cancel_ev{});
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return;
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}
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// Disable DRBs
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parent_fsm()->rrc_ue->mac_ctrl.set_drb_activation(false);
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parent_fsm()->rrc_ue->mac_ctrl.update_mac(mac_controller::proc_stage_t::other);
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/* Enter Handover Execution */
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// TODO: Do anything with MeasCfg info within the Msg (e.g. update ue_var_meas)?
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// Disable DRBs in the MAC, while Reconfiguration is taking place.
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rrc_ue->mac_ctrl.set_drb_activation(false);
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rrc_ue->mac_ctrl.update_mac(mac_controller::proc_stage_t::other);
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/* Send HO Command to UE */
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if (not parent_fsm()->rrc_ue->send_dl_dcch(&dl_dcch_msg)) {
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// Send HO Command to UE
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if (not rrc_ue->send_dl_dcch(&dl_dcch_msg)) {
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trigger(ho_cancel_ev{});
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return;
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}
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/* Start S1AP eNBStatusTransfer Procedure */
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if (not start_enb_status_transfer(*ho_cmd.s1ap_ho_cmd)) {
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trigger(ho_cancel_ev{});
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}
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}
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//! Called in Source ENB during S1-Handover when there was a Reestablishment Request
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void rrc::ue::rrc_mobility::s1_source_ho_st::handle_ho_cancel(const ho_cancel_ev& ev)
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{
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parent_fsm()->rrc_enb->s1ap->send_ho_cancel(parent_fsm()->rrc_ue->rnti);
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}
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void rrc::ue::rrc_mobility::s1_source_ho_st::status_transfer_st::enter(s1_source_ho_st* f)
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{
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f->get_log()->info("HandoverCommand of rnti=0x%x handled successfully.", f->parent_fsm()->rrc_ue->rnti);
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// TODO: Do anything with MeasCfg info within the Msg (e.g. update ue_var_meas)?
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/* Start S1AP eNBStatusTransfer Procedure */
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if (not f->parent_fsm()->start_enb_status_transfer()) {
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f->trigger(srslte::failure_ev{});
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}
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rrc_enb->s1ap->send_ho_cancel(rrc_ue->rnti);
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}
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/*************************************
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* s1_target_ho state methods
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*************************************/
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void rrc::ue::rrc_mobility::handle_ho_req(idle_st& s, const ho_req_rx_ev& ho_req)
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/**
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* @brief handle S1AP "HO Requested" message from the MME
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* - MME --> TeNB
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* @param s initial state
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* @param ho_req event with received message
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*/
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void rrc::ue::rrc_mobility::handle_ho_requested(idle_st& s, const ho_req_rx_ev& ho_req)
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{
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const auto& rrc_container = ho_req.transparent_container->rrc_container;
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@ -685,12 +729,42 @@ void rrc::ue::rrc_mobility::handle_ho_req(idle_st& s, const ho_req_rx_ev& ho_req
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// Apply PHY updates
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rrc_ue->apply_reconf_phy_config(recfg_r8, true);
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/* send S1AP HandoverRequestAcknowledge */
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std::vector<asn1::fixed_octstring<4, true> > admitted_erabs;
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// Set admitted E-RABs
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std::vector<asn1::s1ap::erab_admitted_item_s> admitted_erabs;
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for (auto& erab : rrc_ue->bearer_list.get_erabs()) {
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admitted_erabs.emplace_back();
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srslte::uint32_to_uint8(erab.second.teid_in, admitted_erabs.back().data());
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asn1::s1ap::erab_admitted_item_s& admitted_erab = admitted_erabs.back();
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admitted_erab.erab_id = erab.second.id;
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srslte::uint32_to_uint8(erab.second.teid_in, admitted_erab.gtp_teid.data());
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// Establish GTPU Forwarding Paths
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if (ho_req.transparent_container->erab_info_list_present) {
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auto& lst = ho_req.transparent_container->erab_info_list;
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auto it = std::find_if(
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lst.begin(),
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lst.end(),
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[&erab](const asn1::s1ap::protocol_ie_single_container_s<asn1::s1ap::erab_info_list_ies_o>& fwd_erab) {
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return fwd_erab.value.erab_info_list_item().erab_id == erab.second.id;
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});
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if (it == lst.end()) {
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continue;
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}
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auto& fwd_erab = it->value.erab_info_list_item();
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if (fwd_erab.dl_forwarding_present and
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fwd_erab.dl_forwarding.value == asn1::s1ap::dl_forwarding_opts::dl_forwarding_proposed) {
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admitted_erab.dl_g_tp_teid_present = true;
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gtpu_interface_rrc::bearer_props props;
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props.flush_before_teidin_present = true;
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props.flush_before_teidin = erab.second.teid_in;
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uint32_t dl_teid_in = rrc_ue->bearer_list.add_gtpu_bearer(
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erab.second.id, erab.second.teid_out, erab.second.address.to_number(), &props);
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srslte::uint32_to_uint8(dl_teid_in, admitted_erabs.back().dl_g_tp_teid.data());
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}
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}
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}
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// send S1AP HandoverRequestAcknowledge
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if (not rrc_enb->s1ap->send_ho_req_ack(*ho_req.ho_req_msg, rrc_ue->rnti, std::move(ho_cmd_pdu), admitted_erabs)) {
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trigger(srslte::failure_ev{});
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return;
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@ -721,11 +795,12 @@ bool rrc::ue::rrc_mobility::apply_ho_prep_cfg(const ho_prep_info_r8_ies_s& ho
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get_log()->warning("Data Forwarding of E-RABs not supported");
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}
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// Create E-RAB and associated main GTPU tunnel
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uint32_t teid_out;
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srslte::uint8_to_uint32(erab.gtp_teid.data(), &teid_out);
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rrc_ue->bearer_list.add_erab(
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erab.erab_id, erab.erab_level_qos_params, erab.transport_layer_address, teid_out, nullptr);
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rrc_ue->bearer_list.add_gtpu_bearer(rrc_enb->gtpu, erab.erab_id);
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rrc_ue->bearer_list.add_gtpu_bearer(erab.erab_id);
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}
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// Regenerate AS Keys
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@ -900,8 +975,7 @@ void rrc::ue::rrc_mobility::handle_crnti_ce(intraenb_ho_st& s, const user_crnti_
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void rrc::ue::rrc_mobility::handle_recfg_complete(intraenb_ho_st& s, const recfg_complete_ev& ev)
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{
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logger.info(
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"User rnti=0x%x successfully handovered to cell_id=0x%x", rrc_ue->rnti, s.target_cell->cell_cfg.cell_id);
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logger.info("User rnti=0x%x successfully handovered to cell_id=0x%x", rrc_ue->rnti, s.target_cell->cell_cfg.cell_id);
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}
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} // namespace srsenb
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Francisco
4 years ago
committed by