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srsLTE/lib/include/srsran/interfaces/gnb_interfaces.h

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/**
*
* \section COPYRIGHT
*
* Copyright 2013-2021 Software Radio Systems Limited
*
* By using this file, you agree to the terms and conditions set
* forth in the LICENSE file which can be found at the top level of
* the distribution.
*
*/
#ifndef SRSRAN_GNB_INTERFACES_H
#define SRSRAN_GNB_INTERFACES_H
#include "srsran/srsran.h"
#include "srsenb/hdr/stack/mac/sched_interface.h"
#include "srsran/common/interfaces_common.h"
#include "srsran/common/security.h"
#include "srsran/interfaces/pdcp_interface_types.h"
#include "srsran/interfaces/rlc_interface_types.h"
#include "srsran/interfaces/rrc_interface_types.h"
// EUTRA interfaces that are used unmodified
#include "srsran/interfaces/enb_mac_interfaces.h"
#include "srsran/interfaces/enb_rrc_interfaces.h"
namespace srsenb {
struct sched_nr_ue_cfg_t;
/*****************************
* RLC INTERFACES
****************************/
class rlc_interface_mac_nr
{
public:
/* MAC calls RLC to get RLC segment of nof_bytes length.
* Segmentation happens in this function. RLC PDU is stored in payload. */
virtual int read_pdu(uint16_t rnti, uint32_t lcid, uint8_t* payload, uint32_t nof_bytes) = 0;
virtual void read_pdu_pcch(uint8_t* payload, uint32_t buffer_size) = 0;
/* MAC calls RLC to push an RLC PDU. This function is called from an independent MAC thread.
* PDU gets placed into the buffer and higher layer thread gets notified. */
virtual void write_pdu(uint16_t rnti, uint32_t lcid, uint8_t* payload, uint32_t nof_bytes) = 0;
};
class rlc_interface_pdcp_nr
{
public:
/* PDCP calls RLC to push an RLC SDU. SDU gets placed into the RLC buffer and MAC pulls
* RLC PDUs according to TB size. */
virtual void write_sdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t sdu) = 0;
virtual bool rb_is_um(uint16_t rnti, uint32_t lcid) = 0;
virtual bool sdu_queue_is_full(uint16_t rnti, uint32_t lcid) = 0;
};
class rlc_interface_rrc_nr
{
public:
virtual void clear_buffer(uint16_t rnti) = 0;
virtual void add_user(uint16_t rnti) = 0;
virtual void rem_user(uint16_t rnti) = 0;
virtual void add_bearer(uint16_t rnti, uint32_t lcid, srsran::rlc_config_t cnfg) = 0;
virtual void add_bearer_mrb(uint16_t rnti, uint32_t lcid) = 0;
virtual void write_sdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t sdu) = 0;
};
/*****************************
* PDCP INTERFACES
****************************/
class pdcp_interface_rlc_nr
{
public:
/* RLC calls PDCP to push a PDCP PDU. */
virtual void write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t sdu) = 0;
virtual void notify_delivery(uint16_t rnti, uint32_t lcid, const srsran::pdcp_sn_vector_t& pdcp_sns) = 0;
virtual void notify_failure(uint16_t rnti, uint32_t lcid, const srsran::pdcp_sn_vector_t& pdcp_sns) = 0;
};
class pdcp_interface_rrc_nr
{
public:
virtual void reset(uint16_t rnti) = 0;
virtual void add_user(uint16_t rnti) = 0;
virtual void rem_user(uint16_t rnti) = 0;
virtual void write_sdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t sdu) = 0;
virtual void add_bearer(uint16_t rnti, uint32_t lcid, srsran::pdcp_config_t cnfg) = 0;
virtual void config_security(uint16_t rnti, uint32_t lcid, const srsran::as_security_config_t& sec_cfg) = 0;
virtual void enable_integrity(uint16_t rnti, uint32_t lcid) = 0;
virtual void enable_encryption(uint16_t rnti, uint32_t lcid) = 0;
};
class pdcp_interface_sdap_nr
{
public:
virtual void write_sdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) = 0;
};
/*****************************
* SDAP INTERFACES
****************************/
class sdap_interface_pdcp_nr
{
public:
virtual void write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) = 0;
};
class sdap_interface_gtpu_nr
{
public:
virtual void write_sdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) = 0;
};
/*****************************
* GTPU INTERFACES
****************************/
class gtpu_interface_rrc_nr
{
public:
};
class gtpu_interface_sdap_nr
{
public:
virtual void write_pdu(uint16_t rnti, uint32_t lcid, srsran::unique_byte_buffer_t pdu) = 0;
};
/*****************************
* RRC INTERFACES
****************************/
class rrc_interface_phy_nr
{};
class rrc_interface_mac_nr
{
public:
// Provides MIB packed message
virtual int read_pdu_bcch_bch(const uint32_t tti, srsran::byte_buffer_t& buffer) = 0;
virtual int read_pdu_bcch_dlsch(uint32_t sib_index, srsran::byte_buffer_t& buffer) = 0;
/// User management
virtual int add_user(uint16_t rnti, const sched_nr_ue_cfg_t& uecfg) = 0;
virtual int update_user(uint16_t new_rnti, uint16_t old_rnti) = 0;
virtual void set_activity_user(uint16_t rnti) = 0;
};
// NR interface is almost identical to EUTRA version
class rrc_interface_rlc_nr : public rrc_interface_rlc
{
public:
virtual void read_pdu_pcch(uint8_t* payload, uint32_t payload_size) = 0;
virtual const char* get_rb_name(uint32_t lcid) = 0;
};
// NR interface identical to EUTRA version
class rrc_interface_pdcp_nr : public rrc_interface_pdcp
{};
class phy_interface_rrc_nr
{
public:
/**
* @brief Describes physical layer configuration common among all the UEs for a given cell
*/
struct common_cfg_t {
srsran_carrier_nr_t carrier;
srsran_pdcch_cfg_nr_t pdcch;
srsran_prach_cfg_t prach;
srsran_ssb_cfg_t ssb;
srsran_duplex_mode_t duplex_mode;
};
virtual int set_common_cfg(const common_cfg_t& common_cfg) = 0;
};
class phy_interface_mac_nr
{
public:
// TBD
};
// Combined interface for stack (MAC and RRC) to access PHY
class phy_interface_stack_nr : public phy_interface_rrc_nr, public phy_interface_mac_nr
{
public:
// TBD
};
class stack_interface_mac
{
public:
///< MAC calls stack to inform about new PDUs having arrived to be further processes in stack thread
virtual void process_pdus() = 0;
};
class mac_interface_phy_nr
{
public:
const static int MAX_SSB = 4;
const static int MAX_GRANTS = 4;
const static int MAX_PUCCH_MSG = 64;
const static int MAX_PUCCH_CANDIDATES = 2;
const static int MAX_NZP_CSI_RS = 4;
struct pdcch_dl_t {
srsran_dci_cfg_nr_t dci_cfg = {};
srsran_dci_dl_nr_t dci = {};
};
struct pdcch_ul_t {
srsran_dci_cfg_nr_t dci_cfg = {};
srsran_dci_ul_nr_t dci = {};
};
struct pdsch_t {
srsran_sch_cfg_nr_t sch = {}; ///< PDSCH configuration
std::array<srsran::byte_buffer_t*, SRSRAN_MAX_TB> data = {}; ///< Data pointer
};
struct ssb_t {
srsran_pbch_msg_nr_t pbch_msg = {};
};
struct dl_sched_t {
srsran::bounded_vector<ssb_t, MAX_SSB> ssb;
srsran::bounded_vector<pdcch_dl_t, MAX_GRANTS> pdcch_dl;
srsran::bounded_vector<pdcch_ul_t, MAX_GRANTS> pdcch_ul;
srsran::bounded_vector<pdsch_t, MAX_GRANTS> pdsch;
srsran::bounded_vector<srsran_csi_rs_nzp_resource_t, MAX_NZP_CSI_RS> nzp_csi_rs;
};
struct pusch_t {
uint32_t pid = 0; ///< HARQ process ID
srsran_sch_cfg_nr_t sch = {}; ///< PUSCH configuration
};
/**
* @brief Describes a possible PUCCH candidate transmission
* @note The physical layer shall try decoding all the possible PUCCH candidates and report back to the stack the
* strongest of the candidates. This is thought to be used in the case of SR opportunities in which the UE could
* transmit HARQ-ACK in two possible resources.
*/
struct pucch_candidate_t {
srsran_uci_cfg_nr_t uci_cfg; ///< UCI configuration for the opportunity
srsran_pucch_nr_resource_t resource; ///< PUCCH resource to use
};
struct pucch_t {
srsran_pucch_nr_common_cfg_t pucch_cfg; ///< UE dedicated PUCCH configuration
srsran::bounded_vector<pucch_candidate_t, MAX_PUCCH_CANDIDATES> candidates; ///< PUCCH candidates to decode
};
struct ul_sched_t {
srsran::bounded_vector<pusch_t, MAX_GRANTS> pusch;
srsran::bounded_vector<pucch_t, MAX_GRANTS> pucch;
};
struct pucch_info_t {
srsran_uci_data_nr_t uci_data; ///< RNTI is available under cfg->pucch->rnti
srsran_csi_trs_measurements_t csi; ///< DMRS based signal Channel State Information (CSI)
};
struct pusch_info_t {
// Context
uint16_t rnti; ///< UE temporal identifier
uint32_t pid = 0; ///< HARQ process ID
// SCH and UCI payload information
srsran_pusch_res_nr_t pusch_data;
srsran_uci_cfg_nr_t uci_cfg; ///< Provides UCI configuration, so stack does not need to keep the pending state
// Actual SCH PDU
srsran::unique_byte_buffer_t pdu = nullptr;
// PUSCH signal measurements
srsran_csi_trs_measurements_t csi; ///< DMRS based signal Channel State Information (CSI)
};
struct rach_info_t {
uint32_t slot_index;
uint32_t preamble;
uint32_t time_adv;
};
virtual int slot_indication(const srsran_slot_cfg_t& slot_cfg) = 0;
virtual dl_sched_t* get_dl_sched(const srsran_slot_cfg_t& slot_cfg) = 0;
virtual ul_sched_t* get_ul_sched(const srsran_slot_cfg_t& slot_cfg) = 0;
virtual int pucch_info(const srsran_slot_cfg_t& slot_cfg, const pucch_info_t& pucch_info) = 0;
virtual int pusch_info(const srsran_slot_cfg_t& slot_cfg, pusch_info_t& pusch_info) = 0;
virtual void rach_detected(const rach_info_t& rach_info) = 0;
};
class stack_interface_phy_nr : public mac_interface_phy_nr, public srsran::stack_interface_phy_nr
{};
} // namespace srsenb
#endif // SRSRAN_GNB_INTERFACES_H
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