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128 lines
5.4 KiB
C++
128 lines
5.4 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2021 Software Radio Systems Limited
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*
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* By using this file, you agree to the terms and conditions set
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* forth in the LICENSE file which can be found at the top level of
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* the distribution.
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*
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*/
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#include "srsran/asn1/s1ap_utils.h"
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#include "srsran/interfaces/rrc_interface_types.h"
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#ifndef SRSRAN_ENB_S1AP_INTERFACES_H
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#define SRSRAN_ENB_S1AP_INTERFACES_H
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namespace srsenb {
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struct s1ap_args_t {
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uint32_t enb_id; // 20-bit id (lsb bits)
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uint8_t cell_id; // 8-bit cell id
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uint16_t tac; // 16-bit tac
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uint16_t mcc; // BCD-coded with 0xF filler
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uint16_t mnc; // BCD-coded with 0xF filler
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std::string mme_addr;
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std::string gtp_bind_addr;
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std::string gtp_advertise_addr;
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std::string s1c_bind_addr;
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uint16_t s1c_bind_port;
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std::string enb_name;
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uint32_t ts1_reloc_prep_timeout;
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uint32_t ts1_reloc_overall_timeout;
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int32_t max_s1_setup_retries;
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};
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// S1AP interface for RRC
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class s1ap_interface_rrc
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{
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public:
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using failed_erab_list = std::map<uint32_t, asn1::s1ap::cause_c>;
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struct bearer_status_info {
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uint8_t erab_id;
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uint16_t pdcp_dl_sn, pdcp_ul_sn;
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uint16_t dl_hfn, ul_hfn;
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};
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virtual void initial_ue(uint16_t rnti,
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uint32_t enb_cc_idx,
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asn1::s1ap::rrc_establishment_cause_e cause,
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srsran::unique_byte_buffer_t pdu) = 0;
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virtual void initial_ue(uint16_t rnti,
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uint32_t enb_cc_idx,
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asn1::s1ap::rrc_establishment_cause_e cause,
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srsran::unique_byte_buffer_t pdu,
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uint32_t m_tmsi,
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uint8_t mmec) = 0;
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virtual void write_pdu(uint16_t rnti, srsran::unique_byte_buffer_t pdu) = 0;
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virtual bool user_exists(uint16_t rnti) = 0;
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virtual void user_mod(uint16_t old_rnti, uint16_t new_rnti) = 0;
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virtual bool user_release(uint16_t rnti, asn1::s1ap::cause_radio_network_e cause_radio) = 0;
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virtual bool is_mme_connected() = 0;
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// Notify S1AP of RRC reconfiguration successful finish.
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// Many S1AP procedures use this notification to indicate successful end (e.g InitialContextSetupRequest)
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virtual void notify_rrc_reconf_complete(uint16_t rnti) = 0;
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/**
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* Command the s1ap to transmit a HandoverRequired message to MME.
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* This message initiates the S1 handover preparation procedure at the Source eNB
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*
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* @param rnti user to perform S1 handover
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* @param target_eci eNB Id + Cell Id of the target eNB
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* @param target_plmn PLMN of the target eNB
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* @param fwd_erabs E-RABs that are candidates to DL forwarding
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* @param rrc_container RRC container with SourceENBToTargetENBTransparentContainer message.
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* @return true if successful
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*/
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virtual bool send_ho_required(uint16_t rnti,
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uint32_t target_eci,
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uint16_t target_tac,
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srsran::plmn_id_t target_plmn,
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srsran::span<uint32_t> fwd_erabs,
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srsran::unique_byte_buffer_t rrc_container,
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bool has_direct_fwd_path) = 0;
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/**
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* Command the s1ap to transmit eNBStatusTransfer message to MME. This message passes the PDCP context of the UE
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* performing S1 handover from source eNB to target eNB.
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*
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* @param rnti user to perform S1 handover
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* @param bearer_status_list PDCP SN and HFN status of the bearers to be preserved at target eNB
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* @return true if successful
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*/
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virtual bool send_enb_status_transfer_proc(uint16_t rnti, std::vector<bearer_status_info>& bearer_status_list) = 0;
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/**
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* Cancel on-going S1 Handover. MME should release UE context in target eNB
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* SeNB --> MME
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*/
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virtual void send_ho_cancel(uint16_t rnti, const asn1::s1ap::cause_c& cause) = 0;
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/*************************
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* Target eNB Handover
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************************/
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virtual bool send_ho_req_ack(const asn1::s1ap::ho_request_s& msg,
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uint16_t rnti,
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uint32_t enb_cc_idx,
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srsran::unique_byte_buffer_t ho_cmd,
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srsran::span<asn1::s1ap::erab_admitted_item_s> admitted_bearers,
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srsran::const_span<asn1::s1ap::erab_item_s> not_admitted_bearers) = 0;
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virtual void send_ho_notify(uint16_t rnti, uint64_t target_eci) = 0;
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/**
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* Called during release of a subset of eNB E-RABs. Send E-RAB RELEASE INDICATION to MME.
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* SeNB --> MME
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*/
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virtual bool release_erabs(uint16_t rnti, const std::vector<uint16_t>& erabs_successfully_released) = 0;
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virtual bool send_ue_cap_info_indication(uint16_t rnti, srsran::unique_byte_buffer_t ue_radio_cap) = 0;
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};
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} // namespace srsenb
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#endif // SRSRAN_ENB_S1AP_INTERFACES_H
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