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264 lines
10 KiB
C++
264 lines
10 KiB
C++
/**
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*
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* \section COPYRIGHT
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*
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* Copyright 2013-2020 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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#ifndef SRSLTE_SCHED_GRID_H
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#define SRSLTE_SCHED_GRID_H
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#include "lib/include/srslte/interfaces/sched_interface.h"
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#include "sched_phy_ch/sf_cch_allocator.h"
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#include "sched_ue.h"
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#include "srslte/adt/bounded_bitset.h"
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#include "srslte/srslog/srslog.h"
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#include <deque>
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#include <vector>
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namespace srsenb {
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/// Error code of alloc attempt
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struct alloc_outcome_t {
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enum result_enum {
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SUCCESS,
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DCI_COLLISION,
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RB_COLLISION,
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ERROR,
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NOF_RB_INVALID,
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PUCCH_COLLISION,
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MEASGAP_COLLISION,
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ALREADY_ALLOC,
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NO_DATA,
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INVALID_PRBMASK,
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INVALID_CARRIER,
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INVALID_CODERATE
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};
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result_enum result = ERROR;
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alloc_outcome_t() = default;
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alloc_outcome_t(result_enum e) : result(e) {}
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operator result_enum() { return result; }
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operator bool() { return result == SUCCESS; }
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const char* to_string() const;
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};
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//! Result of a Subframe sched computation
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struct cc_sched_result {
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tti_point tti_rx;
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sched_interface::dl_sched_res_t dl_sched_result = {};
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sched_interface::ul_sched_res_t ul_sched_result = {};
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rbgmask_t dl_mask = {}; ///< Accumulation of all DL RBG allocations
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prbmask_t ul_mask = {}; ///< Accumulation of all UL PRB allocations
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pdcch_mask_t pdcch_mask = {}; ///< Accumulation of all CCE allocations
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bool is_generated(tti_point tti_rx_) const { return tti_rx == tti_rx_; }
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};
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struct sf_sched_result {
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srslte::tti_point tti_rx;
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std::vector<cc_sched_result> enb_cc_list;
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cc_sched_result* new_cc(uint32_t enb_cc_idx);
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const cc_sched_result* get_cc(uint32_t enb_cc_idx) const
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{
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return enb_cc_idx < enb_cc_list.size() ? &enb_cc_list[enb_cc_idx] : nullptr;
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}
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cc_sched_result* get_cc(uint32_t enb_cc_idx)
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{
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return enb_cc_idx < enb_cc_list.size() ? &enb_cc_list[enb_cc_idx] : nullptr;
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}
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bool is_ul_alloc(uint16_t rnti) const;
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bool is_dl_alloc(uint16_t rnti) const;
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};
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struct sched_result_list {
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public:
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sf_sched_result* new_tti(srslte::tti_point tti_rx);
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sf_sched_result* get_sf(srslte::tti_point tti_rx);
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const sf_sched_result* get_sf(srslte::tti_point tti_rx) const;
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const cc_sched_result* get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx) const;
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cc_sched_result* get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx);
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private:
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std::array<sf_sched_result, TTIMOD_SZ> results;
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};
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/// manages a subframe grid resources, namely CCE and DL/UL RB allocations
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class sf_grid_t
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{
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public:
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struct dl_ctrl_alloc_t {
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alloc_outcome_t outcome;
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rbg_interval rbg_range;
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};
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sf_grid_t() : logger(srslog::fetch_basic_logger("MAC")) {}
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void init(const sched_cell_params_t& cell_params_);
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void new_tti(tti_point tti_rx);
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dl_ctrl_alloc_t alloc_dl_ctrl(uint32_t aggr_lvl, alloc_type_t alloc_type);
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alloc_outcome_t alloc_dl_ctrl(uint32_t aggr_lvl, rbg_interval rbg_range, alloc_type_t alloc_type);
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alloc_outcome_t alloc_dl_data(sched_ue* user, const rbgmask_t& user_mask, bool has_pusch_grant);
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bool reserve_dl_rbgs(uint32_t start_rbg, uint32_t end_rbg);
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alloc_outcome_t alloc_ul_data(sched_ue* user, prb_interval alloc, bool needs_pdcch, bool strict = true);
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alloc_outcome_t reserve_ul_prbs(const prbmask_t& prbmask, bool strict);
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alloc_outcome_t reserve_ul_prbs(prb_interval alloc, bool strict);
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bool find_ul_alloc(uint32_t L, prb_interval* alloc) const;
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// getters
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const rbgmask_t& get_dl_mask() const { return dl_mask; }
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const prbmask_t& get_ul_mask() const { return ul_mask; }
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uint32_t get_cfi() const { return pdcch_alloc.get_cfi(); }
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const sf_cch_allocator& get_pdcch_grid() const { return pdcch_alloc; }
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uint32_t get_pucch_width() const { return pucch_nrb; }
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private:
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alloc_outcome_t alloc_dl(uint32_t aggr_lvl,
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alloc_type_t alloc_type,
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rbgmask_t alloc_mask,
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sched_ue* user = nullptr,
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bool has_pusch_grant = false);
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// consts
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const sched_cell_params_t* cc_cfg = nullptr;
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srslog::basic_logger& logger;
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uint32_t nof_rbgs = 0;
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uint32_t si_n_rbg = 0, rar_n_rbg = 0;
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uint32_t pucch_nrb = 0;
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prbmask_t pucch_mask;
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// derived
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sf_cch_allocator pdcch_alloc = {};
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// internal state
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tti_point tti_rx;
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uint32_t avail_rbg = 0;
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rbgmask_t dl_mask = {};
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prbmask_t ul_mask = {};
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};
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/** Description: Stores the RAR, broadcast, paging, DL data, UL data allocations for the given subframe
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* Converts the stored allocations' metadata to the scheduler DL/UL result
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* Handles the generation of DCI formats
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*/
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class sf_sched
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{
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public:
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struct ctrl_alloc_t {
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size_t dci_idx;
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rbg_interval rbg_range;
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uint32_t req_bytes;
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};
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struct rar_alloc_t {
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sf_sched::ctrl_alloc_t alloc_data;
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sched_interface::dl_sched_rar_t rar_grant;
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rar_alloc_t(const sf_sched::ctrl_alloc_t& c, const sched_interface::dl_sched_rar_t& r) : alloc_data(c), rar_grant(r)
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{}
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};
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struct bc_alloc_t : public ctrl_alloc_t {
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sched_interface::dl_sched_bc_t bc_grant;
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bc_alloc_t() = default;
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explicit bc_alloc_t(const ctrl_alloc_t& c) : ctrl_alloc_t(c) {}
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};
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struct dl_alloc_t {
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size_t dci_idx;
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uint16_t rnti;
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rbgmask_t user_mask;
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uint32_t pid;
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};
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struct ul_alloc_t {
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enum type_t { NEWTX, NOADAPT_RETX, ADAPT_RETX };
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bool is_msg3 = false;
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size_t dci_idx;
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type_t type;
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uint16_t rnti;
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prb_interval alloc;
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int msg3_mcs = -1;
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bool is_retx() const { return type == NOADAPT_RETX or type == ADAPT_RETX; }
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bool needs_pdcch() const { return (type == NEWTX and not is_msg3) or type == ADAPT_RETX; }
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};
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struct pending_msg3_t {
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uint16_t rnti = 0;
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uint32_t L = 0;
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uint32_t n_prb = 0;
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uint32_t mcs = 0;
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};
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typedef std::pair<alloc_outcome_t, const ctrl_alloc_t> ctrl_code_t;
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// Control/Configuration Methods
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sf_sched();
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void init(const sched_cell_params_t& cell_params_);
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void new_tti(srslte::tti_point tti_rx_, sf_sched_result* cc_results);
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// DL alloc methods
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alloc_outcome_t alloc_sib(uint32_t aggr_lvl, uint32_t sib_idx, uint32_t sib_ntx, rbg_interval rbgs);
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alloc_outcome_t alloc_paging(uint32_t aggr_lvl, uint32_t paging_payload, rbg_interval rbgs);
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std::pair<alloc_outcome_t, uint32_t> alloc_rar(uint32_t aggr_lvl, const pending_rar_t& rar_grant);
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bool reserve_dl_rbgs(uint32_t rbg_start, uint32_t rbg_end) { return tti_alloc.reserve_dl_rbgs(rbg_start, rbg_end); }
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const std::vector<rar_alloc_t>& get_allocated_rars() const { return rar_allocs; }
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// UL alloc methods
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alloc_outcome_t alloc_msg3(sched_ue* user, const sched_interface::dl_sched_rar_grant_t& rargrant);
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alloc_outcome_t
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alloc_ul(sched_ue* user, prb_interval alloc, ul_alloc_t::type_t alloc_type, bool is_msg3 = false, int msg3_mcs = -1);
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bool reserve_ul_prbs(const prbmask_t& ulmask, bool strict) { return tti_alloc.reserve_ul_prbs(ulmask, strict); }
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bool alloc_phich(sched_ue* user, sched_interface::ul_sched_res_t* ul_sf_result);
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// compute DCIs and generate dl_sched_result/ul_sched_result for a given TTI
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void generate_sched_results(sched_ue_list& ue_db);
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alloc_outcome_t alloc_dl_user(sched_ue* user, const rbgmask_t& user_mask, uint32_t pid);
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tti_point get_tti_tx_dl() const { return to_tx_dl(tti_rx); }
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uint32_t get_nof_ctrl_symbols() const;
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const rbgmask_t& get_dl_mask() const { return tti_alloc.get_dl_mask(); }
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alloc_outcome_t alloc_ul_user(sched_ue* user, prb_interval alloc);
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const prbmask_t& get_ul_mask() const { return tti_alloc.get_ul_mask(); }
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tti_point get_tti_tx_ul() const { return to_tx_ul(tti_rx); }
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// getters
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tti_point get_tti_rx() const { return tti_rx; }
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bool is_dl_alloc(uint16_t rnti) const;
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bool is_ul_alloc(uint16_t rnti) const;
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uint32_t get_enb_cc_idx() const { return cc_cfg->enb_cc_idx; }
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const sched_cell_params_t* get_cc_cfg() const { return cc_cfg; }
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private:
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ctrl_code_t alloc_dl_ctrl(uint32_t aggr_lvl, uint32_t tbs_bytes, uint16_t rnti);
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void set_bc_sched_result(const sf_cch_allocator::alloc_result_t& dci_result,
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sched_interface::dl_sched_res_t* dl_result);
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void set_rar_sched_result(const sf_cch_allocator::alloc_result_t& dci_result,
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sched_interface::dl_sched_res_t* dl_result);
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void set_dl_data_sched_result(const sf_cch_allocator::alloc_result_t& dci_result,
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sched_interface::dl_sched_res_t* dl_result,
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sched_ue_list& ue_list);
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void set_ul_sched_result(const sf_cch_allocator::alloc_result_t& dci_result,
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sched_interface::ul_sched_res_t* ul_result,
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sched_ue_list& ue_list);
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// consts
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const sched_cell_params_t* cc_cfg = nullptr;
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srslog::basic_logger& logger;
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sf_sched_result* cc_results; ///< Results of other CCs for the same Subframe
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// internal state
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sf_grid_t tti_alloc;
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srslte::bounded_vector<bc_alloc_t, sched_interface::MAX_BC_LIST> bc_allocs;
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std::vector<rar_alloc_t> rar_allocs;
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std::vector<dl_alloc_t> data_allocs;
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std::vector<ul_alloc_t> ul_data_allocs;
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uint32_t last_msg3_prb = 0, max_msg3_prb = 0;
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// Next TTI state
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tti_point tti_rx;
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};
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} // namespace srsenb
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#endif // SRSLTE_SCHED_GRID_H
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