sched,nr: changed scheduler nr api to not require slot_indication function

srsenb/hdr/stack/mac/nr/sched_nr.h

@@ -30,6 +30,7 @@ class sched_worker_manager;
 }
 
 class ue_event_manager;
+class sched_result_manager;
 
 class sched_nr final : public sched_nr_interface
 {
@@ -39,13 +40,14 @@ public:
   int  cell_cfg(srsran::const_span<cell_cfg_t> cell_list) override;
   void ue_cfg(uint16_t rnti, const ue_cfg_t& cfg) override;
 
-  void slot_indication(tti_point tti_rx) override;
-  int  generate_sched_result(tti_point tti_rx, uint32_t cc, tti_request_t& tti_req) override;
-
   void dl_ack_info(uint16_t rnti, uint32_t cc, uint32_t pid, uint32_t tb_idx, bool ack) override;
   void ul_sr_info(tti_point tti_rx, uint16_t rnti) override;
 
+  int get_dl_sched(tti_point pdsch_tti, uint32_t cc, dl_sched_t& result) override;
+  int get_ul_sched(tti_point pdcch_tti, uint32_t cc, ul_sched_t& result) override;
+
 private:
+  int  generate_slot_result(tti_point pdcch_tti, uint32_t cc);
   void ue_cfg_impl(uint16_t rnti, const ue_cfg_t& cfg);
 
   // args
@@ -59,8 +61,11 @@ private:
   std::mutex ue_db_mutex;
   ue_map_t   ue_db;
 
-  // management of PHY UE feedback
+  // management of UE feedback
   std::unique_ptr<ue_event_manager> pending_events;
+
+  // management of Sched Result buffering
+  std::unique_ptr<sched_result_manager> pending_results;
 };
 
 } // namespace srsenb

srsenb/hdr/stack/mac/nr/sched_nr_interface.h

@@ -84,23 +84,8 @@ public:
 
   ///// Sched Result /////
 
-  using pdcch_dl_t = mac_interface_phy_nr::pdcch_dl_t;
-  using pdcch_ul_t = mac_interface_phy_nr::pdcch_ul_t;
-
-  struct pdsch_grant {
-    srsran_dci_dl_nr_t dci = {};
-  };
-  using pdsch_list_t = srsran::bounded_vector<pdsch_grant, MAX_GRANTS>;
-
-  struct dl_tti_request_t {
-    tti_point    pdsch_tti;
-    pdsch_list_t pdschs;
-  };
-
-  struct pusch_grant {
-    srsran_dci_ul_nr_t dci = {};
-  };
-  using pusch_list_t = srsran::bounded_vector<pusch_grant, MAX_GRANTS>;
+  using dl_sched_t = mac_interface_phy_nr::dl_sched_t;
+  using ul_sched_t = mac_interface_phy_nr::ul_sched_t;
 
   struct pucch_resource_grant {
     uint16_t rnti;
@@ -112,22 +97,11 @@ public:
   };
   using pucch_list_t = srsran::bounded_vector<pucch_grant, MAX_GRANTS>;
 
-  struct ul_tti_request_t {
-    tti_point    pusch_tti;
-    pusch_list_t puschs;
-    pucch_list_t pucchs;
-  };
-
-  struct tti_request_t {
-    dl_tti_request_t dl_res;
-    ul_tti_request_t ul_res;
-  };
-
-  virtual ~sched_nr_interface()                                                            = default;
-  virtual int  cell_cfg(srsran::const_span<sched_nr_interface::cell_cfg_t> ue_cfg)         = 0;
-  virtual void ue_cfg(uint16_t rnti, const ue_cfg_t& ue_cfg)                               = 0;
-  virtual void slot_indication(tti_point tti_rx)                                           = 0;
-  virtual int  generate_sched_result(tti_point tti_rx, uint32_t cc, tti_request_t& result) = 0;
+  virtual ~sched_nr_interface()                                                    = default;
+  virtual int  cell_cfg(srsran::const_span<sched_nr_interface::cell_cfg_t> ue_cfg) = 0;
+  virtual void ue_cfg(uint16_t rnti, const ue_cfg_t& ue_cfg)                       = 0;
+  virtual int  get_dl_sched(tti_point tti_rx, uint32_t cc, dl_sched_t& result)     = 0;
+  virtual int  get_ul_sched(tti_point tti_rx, uint32_t cc, ul_sched_t& result)     = 0;
 
   virtual void dl_ack_info(uint16_t rnti, uint32_t cc, uint32_t pid, uint32_t tb_idx, bool ack) = 0;
   virtual void ul_sr_info(tti_point, uint16_t rnti)                                             = 0;

srsenb/hdr/stack/mac/nr/sched_nr_pdcch.h

@@ -29,11 +29,11 @@ enum class pdcch_grant_type_t { sib, dl_data, ul_data };
 
 class slot_ue;
 
-using bwp_cfg_t    = sched_nr_interface::bwp_cfg_t;
-using pdsch_list_t = sched_nr_interface::pdsch_list_t;
-using pdsch_grant  = sched_nr_interface::pdsch_grant;
-using pusch_list_t = sched_nr_interface::pusch_list_t;
-using pusch_grant  = sched_nr_interface::pusch_grant;
+using bwp_cfg_t       = sched_nr_interface::bwp_cfg_t;
+using pdcch_dl_t      = mac_interface_phy_nr::pdcch_dl_t;
+using pdcch_ul_t      = mac_interface_phy_nr::pdcch_ul_t;
+using pdcch_dl_list_t = srsran::bounded_vector<pdcch_dl_t, MAX_GRANTS>;
+using pdcch_ul_list_t = srsran::bounded_vector<pdcch_ul_t, MAX_GRANTS>;
 
 class coreset_region
 {
@@ -41,8 +41,8 @@ public:
   coreset_region(const bwp_cfg_t& bwp_cfg_,
                  uint32_t         coreset_id_,
                  uint32_t         slot_idx,
-                 pdsch_list_t&    pdcch_dl_list,
-                 pusch_list_t&    pdcch_ul_list);
+                 pdcch_dl_list_t& pdcch_dl_list,
+                 pdcch_ul_list_t& pdcch_ul_list);
   void reset();
 
   /**
@@ -76,8 +76,8 @@ private:
     slot_ue*           ue;
   };
   srsran::bounded_vector<alloc_record, MAX_GRANTS> dci_list;
-  pdsch_list_t&                                    pdcch_dl_list;
-  pusch_list_t&                                    pdcch_ul_list;
+  pdcch_dl_list_t&                                 pdcch_dl_list;
+  pdcch_ul_list_t&                                 pdcch_ul_list;
 
   // DFS decision tree of PDCCH grants
   struct tree_node {

srsenb/hdr/stack/mac/nr/sched_nr_rb_grid.h

@@ -25,11 +25,6 @@ namespace sched_nr_impl {
 using pdsch_bitmap = srsran::bounded_bitset<25, true>;
 using pusch_bitmap = srsran::bounded_bitset<25, true>;
 
-using pdsch_t      = sched_nr_interface::pdsch_grant;
-using pdsch_list_t = sched_nr_interface::pdsch_list_t;
-
-using pusch_list = sched_nr_interface::pusch_list_t;
-
 const static size_t MAX_CORESET_PER_BWP = 3;
 using slot_coreset_list                 = srsran::bounded_vector<coreset_region, MAX_CORESET_PER_BWP>;
 
@@ -39,8 +34,8 @@ struct bwp_slot_grid {
   bool              is_dl, is_ul;
   pdsch_bitmap      dl_rbgs;
   pusch_bitmap      ul_rbgs;
-  pdsch_list_t      pdschs;
-  pusch_list_t      puschs;
+  pdcch_dl_list_t   dl_pdcchs;
+  pdcch_ul_list_t   ul_pdcchs;
   slot_coreset_list coresets;
   pucch_list_t      pucchs;
 
@@ -52,8 +47,8 @@ struct bwp_slot_grid {
 struct bwp_res_grid {
   bwp_res_grid(const sched_cell_params& cell_cfg_, uint32_t bwp_id_);
 
-  bwp_slot_grid&           operator[](tti_point tti) { return slots[tti.sf_idx()]; };
-  const bwp_slot_grid&     operator[](tti_point tti) const { return slots[tti.sf_idx()]; };
+  bwp_slot_grid&           operator[](tti_point tti) { return slots[tti.to_uint() % slots.capacity()]; };
+  const bwp_slot_grid&     operator[](tti_point tti) const { return slots[tti.to_uint() % slots.capacity()]; };
   uint32_t                 id() const { return bwp_id; }
   uint32_t                 nof_prbs() const { return cell_cfg->cell_cfg.nof_prb; }
   const sched_cell_params& cell_params() const { return *cell_cfg; }

srsenb/hdr/stack/mac/nr/sched_nr_worker.h

@@ -22,12 +22,12 @@
 #include "srsran/adt/span.h"
 #include <condition_variable>
 #include <mutex>
-#include <semaphore.h>
 
 namespace srsenb {
 namespace sched_nr_impl {
 
-using slot_res_t = sched_nr_interface::tti_request_t;
+using dl_sched_t = sched_nr_interface::dl_sched_t;
+using ul_sched_t = sched_nr_interface::ul_sched_t;
 
 class slot_cc_worker
 {
@@ -55,27 +55,31 @@ private:
 
 class sched_worker_manager
 {
+  struct slot_worker_ctxt {
+    std::mutex                  slot_mutex; // lock of all workers of the same slot.
+    std::condition_variable     cvar;
+    tti_point                   tti_rx;
+    int                         nof_workers_waiting = 0;
+    std::atomic<int>            worker_count{0}; // variable shared across slot_cc_workers
+    std::vector<slot_cc_worker> workers;
+  };
+
 public:
   explicit sched_worker_manager(ue_map_t& ue_db_, const sched_params& cfg_);
   sched_worker_manager(const sched_worker_manager&) = delete;
   sched_worker_manager(sched_worker_manager&&)      = delete;
   ~sched_worker_manager();
 
-  void reserve_workers(tti_point tti_rx);
-  void start_tti(tti_point tti_rx);
-  bool run_tti(tti_point tti_rx, uint32_t cc, sched_nr_interface::tti_request_t& req);
-  void end_tti(tti_point tti_rx);
+  void start_slot(tti_point tti_rx, srsran::move_callback<void()> process_feedback);
+  bool run_slot(tti_point tti_rx, uint32_t cc);
+  void release_slot(tti_point tti_rx);
+  bool get_sched_result(tti_point pdcch_tti, uint32_t cc, dl_sched_t& dl_res, ul_sched_t& ul_res);
 
 private:
   const sched_params& cfg;
   ue_map_t&           ue_db;
+  std::mutex          ue_db_mutex;
 
-  struct slot_worker_ctxt {
-    sem_t                       sf_sem; // lock of all workers of the same slot. unlocked by last slot_cc_worker
-    tti_point                   tti_rx;
-    std::atomic<int>            worker_count{0}; // variable shared across slot_cc_workers
-    std::vector<slot_cc_worker> workers;
-  };
   std::vector<std::unique_ptr<slot_worker_ctxt> > slot_ctxts;
 
   srsran::bounded_vector<cell_res_grid, SCHED_NR_MAX_CARRIERS> cell_grid_list;

srsenb/src/stack/mac/nr/sched_nr.cc

@@ -16,10 +16,7 @@
 
 namespace srsenb {
 
-using sched_nr_impl::sched_worker_manager;
-using sched_nr_impl::ue;
-using sched_nr_impl::ue_carrier;
-using sched_nr_impl::ue_map_t;
+using namespace sched_nr_impl;
 
 static int assert_ue_cfg_valid(uint16_t rnti, const sched_nr_interface::ue_cfg_t& uecfg);
 
@@ -44,7 +41,7 @@ public:
     feedback_list.back().cc       = cc;
     feedback_list.back().callback = std::move(event);
   }
-  void new_tti()
+  void new_slot()
   {
     {
       std::lock_guard<std::mutex> lock(common_mutex);
@@ -81,6 +78,68 @@ private:
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
+class sched_result_manager
+{
+public:
+  explicit sched_result_manager(uint32_t nof_cc_)
+  {
+    for (auto& v : results) {
+      v.resize(nof_cc_);
+    }
+  }
+
+  dl_sched_t& add_dl_result(tti_point tti, uint32_t cc)
+  {
+    if (not has_dl_result(tti, cc)) {
+      results[tti.to_uint()][cc].tti_dl = tti;
+      results[tti.to_uint()][cc].dl_res = {};
+    }
+    return results[tti.to_uint()][cc].dl_res;
+  }
+  ul_sched_t& add_ul_result(tti_point tti, uint32_t cc)
+  {
+    if (not has_ul_result(tti, cc)) {
+      results[tti.to_uint()][cc].tti_ul = tti;
+      results[tti.to_uint()][cc].ul_res = {};
+    }
+    return results[tti.to_uint()][cc].ul_res;
+  }
+
+  bool has_dl_result(tti_point tti, uint32_t cc) const { return results[tti.to_uint()][cc].tti_dl == tti; }
+
+  bool has_ul_result(tti_point tti, uint32_t cc) const { return results[tti.to_uint()][cc].tti_ul == tti; }
+
+  dl_sched_t pop_dl_result(tti_point tti, uint32_t cc)
+  {
+    if (has_dl_result(tti, cc)) {
+      results[tti.to_uint()][cc].tti_dl.reset();
+      return results[tti.to_uint()][cc].dl_res;
+    }
+    return {};
+  }
+
+  ul_sched_t pop_ul_result(tti_point tti, uint32_t cc)
+  {
+    if (has_ul_result(tti, cc)) {
+      results[tti.to_uint()][cc].tti_ul.reset();
+      return results[tti.to_uint()][cc].ul_res;
+    }
+    return {};
+  }
+
+private:
+  struct slot_result_t {
+    tti_point  tti_dl;
+    tti_point  tti_ul;
+    dl_sched_t dl_res;
+    ul_sched_t ul_res;
+  };
+
+  srsran::circular_array<std::vector<slot_result_t>, TTIMOD_SZ> results;
+};
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
 sched_nr::sched_nr(const sched_cfg_t& sched_cfg) :
   cfg(sched_cfg), pending_events(new ue_event_manager(ue_db)), logger(srslog::fetch_basic_logger("MAC"))
 {}
@@ -94,6 +153,7 @@ int sched_nr::cell_cfg(srsran::const_span<cell_cfg_t> cell_list)
     cfg.cells.emplace_back(cc, cell_list[cc], cfg.sched_cfg);
   }
 
+  pending_results.reset(new sched_result_manager(cell_list.size()));
   sched_workers.reset(new sched_nr_impl::sched_worker_manager(ue_db, cfg));
   return SRSRAN_SUCCESS;
 }
@@ -113,33 +173,50 @@ void sched_nr::ue_cfg_impl(uint16_t rnti, const ue_cfg_t& uecfg)
   }
 }
 
-void sched_nr::slot_indication(tti_point tti_rx)
+/// Generate {tti,cc} scheduling decision
+int sched_nr::generate_slot_result(tti_point pdcch_tti, uint32_t cc)
 {
-  // Lock slot workers for provided tti_rx
-  sched_workers->reserve_workers(tti_rx);
+  tti_point tti_rx = pdcch_tti - TX_ENB_DELAY;
 
-  {
+  // Lock carrier workers for provided tti_rx
+  sched_workers->start_slot(tti_rx, [this]() {
+    // In case it is first worker for the given slot
     // synchronize {tti,cc} state. e.g. reserve UE resources for {tti,cc} decision, process feedback
-    std::lock_guard<std::mutex> lock(ue_db_mutex);
-    // Process pending events
-    pending_events->new_tti();
+    pending_events->new_slot();
+  });
 
-    sched_workers->start_tti(tti_rx);
+  // unlocked, parallel region
+  bool all_workers_finished = sched_workers->run_slot(tti_rx, cc);
+
+  if (all_workers_finished) {
+    // once all workers of the same subframe finished, synchronize sched outcome with ue_db
+    sched_workers->release_slot(tti_rx);
   }
+
+  // Copy results to intermediate buffer
+  dl_sched_t& dl_res = pending_results->add_dl_result(pdcch_tti, cc);
+  ul_sched_t& ul_res = pending_results->add_ul_result(pdcch_tti, cc);
+  sched_workers->get_sched_result(pdcch_tti, cc, dl_res, ul_res);
+
+  return SRSRAN_SUCCESS;
 }
 
-/// Generate {tti,cc} scheduling decision
-int sched_nr::generate_sched_result(tti_point tti_rx, uint32_t cc, tti_request_t& req)
+int sched_nr::get_dl_sched(tti_point tti_tx, uint32_t cc, dl_sched_t& result)
 {
-  // unlocked, parallel region
-  bool all_workers_finished = sched_workers->run_tti(tti_rx, cc, req);
+  if (not pending_results->has_dl_result(tti_tx, cc)) {
+    generate_slot_result(tti_tx, cc);
+  }
 
-  if (all_workers_finished) {
-    // once all workers of the same subframe finished, synchronize sched outcome with ue_db
-    std::lock_guard<std::mutex> lock(ue_db_mutex);
-    sched_workers->end_tti(tti_rx);
+  result = pending_results->pop_dl_result(tti_tx, cc);
+  return SRSRAN_SUCCESS;
+}
+int sched_nr::get_ul_sched(tti_point tti_rx, uint32_t cc, ul_sched_t& result)
+{
+  if (not pending_results->has_ul_result(tti_rx, cc)) {
+    return SRSRAN_ERROR;
   }
 
+  result = pending_results->pop_ul_result(tti_rx, cc);
   return SRSRAN_SUCCESS;
 }
 

srsenb/src/stack/mac/nr/sched_nr_pdcch.cc

@@ -19,8 +19,8 @@ namespace sched_nr_impl {
 coreset_region::coreset_region(const bwp_cfg_t& bwp_cfg_,
                                uint32_t         coreset_id_,
                                uint32_t         slot_idx_,
-                               pdsch_list_t&    dl_list_,
-                               pusch_list_t&    ul_list_) :
+                               pdcch_dl_list_t& dl_list_,
+                               pdcch_ul_list_t& ul_list_) :
   bwp_cfg(&bwp_cfg_),
   coreset_cfg(&bwp_cfg_.coresets[coreset_id_ - 1].value()),
   coreset_id(coreset_id_),
@@ -156,10 +156,10 @@ bool coreset_region::alloc_dfs_node(const alloc_record& record, uint32_t start_d
     alloc_dfs.push_back(node);
     // set new DCI position
     if (record.alloc_type == pdcch_grant_type_t::ul_data) {
-      pusch_grant& pdcch_ul     = pdcch_ul_list[record.idx];
+      pdcch_ul_t& pdcch_ul      = pdcch_ul_list[record.idx];
       pdcch_ul.dci.ctx.location = node.dci_pos;
     } else {
-      pdsch_grant& pdcch_dl     = pdcch_dl_list[record.idx];
+      pdcch_dl_t& pdcch_dl      = pdcch_dl_list[record.idx];
       pdcch_dl.dci.ctx.location = node.dci_pos;
     }
     return true;

srsenb/src/stack/mac/nr/sched_nr_rb_grid.cc

@@ -27,7 +27,7 @@ bwp_slot_grid::bwp_slot_grid(const sched_cell_params& cell_params, uint32_t bwp_
   is_ul(srsran_tdd_nr_is_ul(&cell_params.cell_cfg.tdd, NUMEROLOGY_IDX, slot_idx_))
 {
   const uint32_t coreset_id = 1; // Note: for now only one coreset per BWP supported
-  coresets.emplace_back(cell_params.cell_cfg.bwps[0], coreset_id, slot_idx_, pdschs, puschs);
+  coresets.emplace_back(cell_params.cell_cfg.bwps[0], coreset_id, slot_idx_, dl_pdcchs, ul_pdcchs);
 }
 
 void bwp_slot_grid::reset()
@@ -37,15 +37,15 @@ void bwp_slot_grid::reset()
   }
   dl_rbgs.reset();
   ul_rbgs.reset();
-  pdschs.clear();
-  puschs.clear();
+  dl_pdcchs.clear();
+  ul_pdcchs.clear();
   pucchs.clear();
 }
 
 bwp_res_grid::bwp_res_grid(const sched_cell_params& cell_cfg_, uint32_t bwp_id_) : bwp_id(bwp_id_), cell_cfg(&cell_cfg_)
 {
-  for (uint32_t sl = 0; sl < SCHED_NR_NOF_SUBFRAMES; ++sl) {
-    slots.emplace_back(cell_cfg_, bwp_id, sl);
+  for (uint32_t sl = 0; sl < slots.capacity(); ++sl) {
+    slots.emplace_back(cell_cfg_, bwp_id, sl % static_cast<uint32_t>(SRSRAN_NSLOTS_PER_FRAME_NR(0u)));
   }
 }
 
@@ -75,7 +75,7 @@ alloc_result slot_bwp_sched::alloc_pdsch(slot_ue& ue, const rbgmask_t& dl_mask)
     logger.warning("SCHED: Trying to allocate PDSCH in TDD non-DL slot index=%d", bwp_pdsch_slot.slot_idx);
     return alloc_result::no_sch_space;
   }
-  pdsch_list_t& pdsch_grants = bwp_pdsch_slot.pdschs;
+  pdcch_dl_list_t& pdsch_grants = bwp_pdsch_slot.dl_pdcchs;
   if (pdsch_grants.full()) {
     logger.warning("SCHED: Maximum number of DL allocations reached");
     return alloc_result::no_grant_space;
@@ -109,7 +109,7 @@ alloc_result slot_bwp_sched::alloc_pdsch(slot_ue& ue, const rbgmask_t& dl_mask)
   }
 
   // Allocation Successful
-  pdsch_grant& pdcch = bwp_pdcch_slot.pdschs.back();
+  pdcch_dl_t& pdcch = bwp_pdcch_slot.dl_pdcchs.back();
   fill_dci_ue_cfg(ue, dl_mask, bwp_grid.cell_params(), pdcch.dci);
   pdsch_mask |= dl_mask;
   bwp_uci_slot.pucchs.emplace_back();
@@ -127,13 +127,14 @@ alloc_result slot_bwp_sched::alloc_pusch(slot_ue& ue, const rbgmask_t& ul_mask)
     logger.warning("SCHED: Trying to allocate PUSCH for rnti=0x%x with no available HARQs", ue.rnti);
     return alloc_result::no_rnti_opportunity;
   }
+  auto& bwp_pdcch_slot = bwp_grid[ue.pdcch_tti];
   auto& bwp_pusch_slot = bwp_grid[ue.pusch_tti];
   if (not bwp_pusch_slot.is_ul) {
     logger.warning("SCHED: Trying to allocate PUSCH in TDD non-UL slot index=%d", bwp_pusch_slot.slot_idx);
     return alloc_result::no_sch_space;
   }
-  pusch_list& pusch_grants = bwp_pusch_slot.puschs;
-  if (pusch_grants.full()) {
+  pdcch_ul_list_t& pdcchs = bwp_pdcch_slot.ul_pdcchs;
+  if (pdcchs.full()) {
     logger.warning("SCHED: Maximum number of UL allocations reached");
     return alloc_result::no_grant_space;
   }
@@ -142,7 +143,7 @@ alloc_result slot_bwp_sched::alloc_pusch(slot_ue& ue, const rbgmask_t& ul_mask)
     return alloc_result::sch_collision;
   }
   const uint32_t aggr_idx = 2, coreset_id = 0;
-  if (not bwp_grid[ue.pdcch_tti].coresets[coreset_id].alloc_dci(pdcch_grant_type_t::ul_data, aggr_idx, &ue)) {
+  if (not bwp_pdcch_slot.coresets[coreset_id].alloc_dci(pdcch_grant_type_t::ul_data, aggr_idx, &ue)) {
     // Could not find space in PDCCH
     return alloc_result::no_cch_space;
   }
@@ -159,8 +160,8 @@ alloc_result slot_bwp_sched::alloc_pusch(slot_ue& ue, const rbgmask_t& ul_mask)
   }
 
   // Allocation Successful
-  pdsch_grant& pdsch = bwp_grid[ue.pdcch_tti].pdschs.back();
-  fill_dci_ue_cfg(ue, ul_mask, bwp_grid.cell_params(), pdsch.dci);
+  pdcch_ul_t& pdcch = pdcchs.back();
+  fill_dci_ue_cfg(ue, ul_mask, bwp_grid.cell_params(), pdcch.dci);
   pusch_mask |= ul_mask;
 
   return alloc_result::success;

srsenb/src/stack/mac/nr/sched_nr_worker.cc

@@ -103,7 +103,6 @@ sched_worker_manager::sched_worker_manager(ue_map_t& ue_db_, const sched_params&
   slot_ctxts.resize(cfg.sched_cfg.nof_concurrent_subframes);
   for (size_t i = 0; i < cfg.sched_cfg.nof_concurrent_subframes; ++i) {
     slot_ctxts[i].reset(new slot_worker_ctxt());
-    sem_init(&slot_ctxts[i]->sf_sem, 0, 1);
     slot_ctxts[i]->workers.reserve(cfg.cells.size());
     for (uint32_t cc = 0; cc < cfg.cells.size(); ++cc) {
       slot_ctxts[i]->workers.emplace_back(cfg.cells[cc], cell_grid_list[cc]);
@@ -111,44 +110,47 @@ sched_worker_manager::sched_worker_manager(ue_map_t& ue_db_, const sched_params&
   }
 }
 
-sched_worker_manager::~sched_worker_manager()
-{
-  // acquire all slot worker contexts
-  for (auto& slot_ctxt : slot_ctxts) {
-    sem_wait(&slot_ctxt->sf_sem);
-  }
-  // destroy all slot worker contexts
-  for (auto& slot_ctxt : slot_ctxts) {
-    sem_destroy(&slot_ctxt->sf_sem);
-  }
-}
+sched_worker_manager::~sched_worker_manager() = default;
 
 sched_worker_manager::slot_worker_ctxt& sched_worker_manager::get_sf(tti_point tti_rx)
 {
   return *slot_ctxts[tti_rx.to_uint() % slot_ctxts.size()];
 }
 
-void sched_worker_manager::reserve_workers(tti_point tti_rx_)
+void sched_worker_manager::start_slot(tti_point tti_rx, srsran::move_callback<void()> process_feedback)
 {
-  // lock if slot worker is already being used
-  auto& sf_worker_ctxt = get_sf(tti_rx_);
-  sem_wait(&sf_worker_ctxt.sf_sem);
+  auto& sf_worker_ctxt = get_sf(tti_rx);
+
+  std::unique_lock<std::mutex> lock(sf_worker_ctxt.slot_mutex);
+  while ((sf_worker_ctxt.tti_rx.is_valid() and sf_worker_ctxt.tti_rx != tti_rx)) {
+    // wait for previous slot to finish
+    sf_worker_ctxt.nof_workers_waiting++;
+    sf_worker_ctxt.cvar.wait(lock);
+    sf_worker_ctxt.nof_workers_waiting--;
+  }
+  if (sf_worker_ctxt.tti_rx == tti_rx) {
+    // another worker with the same slot idx already started
+    return;
+  }
 
-  sf_worker_ctxt.tti_rx = tti_rx_;
-  sf_worker_ctxt.worker_count.store(static_cast<int>(sf_worker_ctxt.workers.size()), std::memory_order_relaxed);
-}
+  {
+    std::lock_guard<std::mutex> db_lock(ue_db_mutex);
 
-void sched_worker_manager::start_tti(tti_point tti_rx_)
-{
-  auto& sf_worker_ctxt = get_sf(tti_rx_);
-  srsran_assert(sf_worker_ctxt.tti_rx == tti_rx_, "invalid run_tti(tti, cc) arguments");
+    process_feedback();
 
-  for (uint32_t cc = 0; cc < sf_worker_ctxt.workers.size(); ++cc) {
-    sf_worker_ctxt.workers[cc].start(sf_worker_ctxt.tti_rx, ue_db);
+    for (uint32_t cc = 0; cc < sf_worker_ctxt.workers.size(); ++cc) {
+      sf_worker_ctxt.workers[cc].start(tti_rx, ue_db);
+    }
+  }
+
+  sf_worker_ctxt.tti_rx = tti_rx;
+  sf_worker_ctxt.worker_count.store(static_cast<int>(sf_worker_ctxt.workers.size()), std::memory_order_relaxed);
+  if (sf_worker_ctxt.nof_workers_waiting > 0) {
+    sf_worker_ctxt.cvar.notify_all();
   }
 }
 
-bool sched_worker_manager::run_tti(tti_point tti_rx_, uint32_t cc, slot_res_t& tti_req)
+bool sched_worker_manager::run_slot(tti_point tti_rx_, uint32_t cc)
 {
   auto& sf_worker_ctxt = get_sf(tti_rx_);
   srsran_assert(sf_worker_ctxt.tti_rx == tti_rx_, "invalid run_tti(tti, cc) arguments");
@@ -156,15 +158,6 @@ bool sched_worker_manager::run_tti(tti_point tti_rx_, uint32_t cc, slot_res_t& t
   // Get {tti, cc} scheduling decision
   sf_worker_ctxt.workers[cc].run();
 
-  // Copy requested TTI DL and UL sched result
-  tti_req.dl_res.pdsch_tti = tti_rx_ + TX_ENB_DELAY;
-  tti_req.dl_res.pdschs    = cell_grid_list[cc].bwps[0][tti_req.dl_res.pdsch_tti].pdschs;
-  cell_grid_list[cc].bwps[0][tti_req.dl_res.pdsch_tti].reset();
-  tti_req.ul_res.pusch_tti = tti_rx_ + TX_ENB_DELAY;
-  tti_req.ul_res.puschs    = cell_grid_list[cc].bwps[0][tti_req.ul_res.pusch_tti].puschs;
-  tti_req.ul_res.pucchs    = cell_grid_list[cc].bwps[0][tti_req.ul_res.pusch_tti].pucchs;
-  cell_grid_list[cc].bwps[0][tti_req.ul_res.pusch_tti].reset();
-
   // decrement the number of active workers
   int rem_workers = sf_worker_ctxt.worker_count.fetch_sub(1, std::memory_order_release) - 1;
   srsran_assert(rem_workers >= 0, "invalid number of calls to run_tti(tti, cc)");
@@ -172,18 +165,45 @@ bool sched_worker_manager::run_tti(tti_point tti_rx_, uint32_t cc, slot_res_t& t
   return rem_workers == 0;
 }
 
-void sched_worker_manager::end_tti(tti_point tti_rx_)
+void sched_worker_manager::release_slot(tti_point tti_rx_)
 {
   auto& sf_worker_ctxt = get_sf(tti_rx_);
   srsran_assert(sf_worker_ctxt.tti_rx == tti_rx_, "invalid run_tti(tti, cc) arguments");
   srsran_assert(sf_worker_ctxt.worker_count == 0, "invalid number of calls to run_tti(tti, cc)");
 
-  // All the workers of the same TTI have finished. Synchronize scheduling decisions with UEs state
-  for (slot_cc_worker& worker : sf_worker_ctxt.workers) {
-    worker.end_tti();
+  {
+    std::lock_guard<std::mutex> lock(ue_db_mutex);
+
+    // All the workers of the same slot have finished. Synchronize scheduling decisions with UEs state
+    for (slot_cc_worker& worker : sf_worker_ctxt.workers) {
+      worker.end_tti();
+    }
+  }
+
+  std::unique_lock<std::mutex> lock(sf_worker_ctxt.slot_mutex);
+  sf_worker_ctxt.tti_rx = {};
+  if (sf_worker_ctxt.nof_workers_waiting > 0) {
+    sf_worker_ctxt.cvar.notify_one();
   }
+}
+
+bool sched_worker_manager::get_sched_result(tti_point pdcch_tti, uint32_t cc, dl_sched_t& dl_res, ul_sched_t& ul_res)
+{
+  auto& pdcch_bwp_slot = cell_grid_list[cc].bwps[0][pdcch_tti];
+
+  dl_res.pdcch_dl = pdcch_bwp_slot.dl_pdcchs;
+  dl_res.pdcch_ul = pdcch_bwp_slot.ul_pdcchs;
+
+  ul_res.pucch.resize(pdcch_bwp_slot.pucchs.size());
+  for (uint32_t i = 0; i < pdcch_bwp_slot.pucchs.size(); ++i) {
+    ul_res.pucch[i].uci_cfg.pucch.rnti        = pdcch_bwp_slot.pucchs[i].resource.rnti;
+    ul_res.pucch[i].uci_cfg.pucch.resource_id = pdcch_bwp_slot.pucchs[i].resource.resource_id;
+  }
+
+  // clear up BWP slot
+  pdcch_bwp_slot.reset();
 
-  sem_post(&sf_worker_ctxt.sf_sem);
+  return true;
 }
 
 } // namespace sched_nr_impl

srsenb/test/mac/nr/sched_nr_sim_ue.cc

@@ -44,8 +44,8 @@ int sched_nr_ue_sim::update(const sched_nr_cc_output_res_t& cc_out)
 void sched_nr_ue_sim::update_dl_harqs(const sched_nr_cc_output_res_t& cc_out)
 {
   uint32_t cc = cc_out.cc;
-  for (uint32_t i = 0; i < cc_out.dl_cc_result->pdschs.size(); ++i) {
-    const auto& data = cc_out.dl_cc_result->pdschs[i];
+  for (uint32_t i = 0; i < cc_out.dl_cc_result->pdcch_dl.size(); ++i) {
+    const auto& data = cc_out.dl_cc_result->pdcch_dl[i];
     if (data.dci.ctx.rnti != ctxt.rnti) {
       continue;
     }
@@ -98,7 +98,7 @@ int sched_nr_sim_base::add_user(uint16_t rnti, const sched_nr_interface::ue_cfg_
   return SRSRAN_SUCCESS;
 }
 
-void sched_nr_sim_base::slot_indication(srsran::tti_point tti_rx)
+void sched_nr_sim_base::new_slot(srsran::tti_point tti_rx)
 {
   {
     std::unique_lock<std::mutex> lock(mutex);
@@ -113,7 +113,6 @@ void sched_nr_sim_base::slot_indication(srsran::tti_point tti_rx)
       apply_tti_events(ue.second.get_ctxt(), events);
     }
   }
-  sched_ptr->slot_indication(tti_rx);
 }
 
 void sched_nr_sim_base::update(sched_nr_cc_output_res_t& cc_out)

srsenb/test/mac/nr/sched_nr_sim_ue.h

@@ -20,10 +20,10 @@
 namespace srsenb {
 
 struct sched_nr_cc_output_res_t {
-  tti_point                             tti_rx;
-  uint32_t                              cc;
-  sched_nr_interface::dl_tti_request_t* dl_cc_result;
-  sched_nr_interface::ul_tti_request_t* ul_cc_result;
+  tti_point                       tti_rx;
+  uint32_t                        cc;
+  sched_nr_interface::dl_sched_t* dl_cc_result;
+  sched_nr_interface::ul_sched_t* ul_cc_result;
 };
 
 struct ue_nr_cc_ctxt_t {
@@ -75,7 +75,7 @@ public:
 
   int add_user(uint16_t rnti, const sched_nr_interface::ue_cfg_t& ue_cfg_, uint32_t preamble_idx);
 
-  void slot_indication(srsran::tti_point tti_rx);
+  void new_slot(srsran::tti_point tti_rx);
   void update(sched_nr_cc_output_res_t& cc_out);
 
   sched_nr_ue_sim&       at(uint16_t rnti) { return ue_db.at(rnti); }

srsenb/test/mac/nr/sched_nr_test.cc

@@ -17,6 +17,8 @@
 
 namespace srsenb {
 
+using dl_sched_t = sched_nr_interface::dl_sched_t;
+
 srsran_coreset_t get_default_coreset()
 {
   srsran_coreset_t coreset{};
@@ -87,37 +89,46 @@ sched_nr_interface::ue_cfg_t get_default_ue_cfg(uint32_t nof_cc)
 }
 
 struct task_job_manager {
-  std::mutex              mutex;
-  std::condition_variable cond_var;
-  int                     tasks       = 0;
-  int                     res_count   = 0;
-  int                     pdsch_count = 0;
-  int                     max_tasks   = std::numeric_limits<int>::max() / 2;
-  srslog::basic_logger&   test_logger = srslog::fetch_basic_logger("TEST");
-
-  void start_task()
+  std::mutex            mutex;
+  int                   res_count   = 0;
+  int                   pdsch_count = 0;
+  srslog::basic_logger& test_logger = srslog::fetch_basic_logger("TEST");
+  struct slot_guard {
+    int                     count = 0;
+    std::condition_variable cvar;
+  };
+  srsran::bounded_vector<slot_guard, 10> slot_counter{};
+
+  explicit task_job_manager(int max_concurrent_slots = 4) : slot_counter(max_concurrent_slots) {}
+
+  void start_slot(tti_point tti, int nof_sectors)
   {
     std::unique_lock<std::mutex> lock(mutex);
-    while (tasks >= max_tasks) {
-      cond_var.wait(lock);
+    auto&                        sl = slot_counter[tti.to_uint() % slot_counter.size()];
+    while (sl.count > 0) {
+      sl.cvar.wait(lock);
     }
-    tasks++;
+    sl.count = nof_sectors;
   }
-  void finish_task(const sched_nr_interface::tti_request_t& res)
+  void finish_cc(tti_point tti, const dl_sched_t& dl_res, const sched_nr_interface::ul_sched_t& ul_res)
   {
     std::unique_lock<std::mutex> lock(mutex);
-    TESTASSERT(res.dl_res.pdschs.size() <= 1);
+    TESTASSERT(dl_res.pdcch_dl.size() <= 1);
     res_count++;
-    pdsch_count += res.dl_res.pdschs.size();
-    if (tasks-- >= max_tasks or tasks == 0) {
-      cond_var.notify_one();
+    pdsch_count += dl_res.pdcch_dl.size();
+    auto& sl = slot_counter[tti.to_uint() % slot_counter.size()];
+    if (--sl.count == 0) {
+      sl.cvar.notify_one();
     }
   }
   void wait_task_finish()
   {
     std::unique_lock<std::mutex> lock(mutex);
-    while (tasks > 0) {
-      cond_var.wait(lock);
+    for (auto& sl : slot_counter) {
+      while (sl.count > 0) {
+        sl.cvar.wait(lock);
+      }
+      sl.count = 1;
     }
   }
   void print_results() const
@@ -142,17 +153,19 @@ void sched_nr_cfg_serialized_test()
   sched_tester.add_user(0x46, uecfg, 0);
 
   for (uint32_t nof_ttis = 0; nof_ttis < max_nof_ttis; ++nof_ttis) {
-    tti_point tti(nof_ttis % 10240);
-    sched_tester.slot_indication(tti);
+    tti_point tti_rx(nof_ttis % 10240);
+    tti_point tti_tx = tti_rx + TX_ENB_DELAY;
+    tasks.start_slot(tti_rx, nof_sectors);
+    sched_tester.new_slot(tti_tx);
     for (uint32_t cc = 0; cc < cells_cfg.size(); ++cc) {
-      tasks.start_task();
-      sched_nr_interface::tti_request_t res;
-      TESTASSERT(sched_tester.get_sched()->generate_sched_result(tti, cc, res) == SRSRAN_SUCCESS);
-      sched_nr_cc_output_res_t out{tti, cc, &res.dl_res, &res.ul_res};
+      sched_nr_interface::dl_sched_t dl_res;
+      sched_nr_interface::ul_sched_t ul_res;
+      TESTASSERT(sched_tester.get_sched()->get_dl_sched(tti_tx, cc, dl_res) == SRSRAN_SUCCESS);
+      TESTASSERT(sched_tester.get_sched()->get_ul_sched(tti_tx, cc, ul_res) == SRSRAN_SUCCESS);
+      sched_nr_cc_output_res_t out{tti_tx, cc, &dl_res, &ul_res};
       sched_tester.update(out);
-      tasks.finish_task(res);
-      TESTASSERT(not srsran_tdd_nr_is_dl(&cells_cfg[cc].tdd, 0, (tti + TX_ENB_DELAY).sf_idx()) or
-                 res.dl_res.pdschs.size() == 1);
+      tasks.finish_cc(tti_rx, dl_res, ul_res);
+      TESTASSERT(not srsran_tdd_nr_is_dl(&cells_cfg[cc].tdd, 0, (tti_tx).sf_idx()) or dl_res.pdcch_dl.size() == 1);
     }
   }
 
@@ -162,11 +175,12 @@ void sched_nr_cfg_serialized_test()
 
 void sched_nr_cfg_parallel_cc_test()
 {
+  uint32_t         nof_sectors  = 4;
   uint32_t         max_nof_ttis = 1000;
   task_job_manager tasks;
 
   sched_nr_interface::sched_cfg_t             cfg;
-  std::vector<sched_nr_interface::cell_cfg_t> cells_cfg = get_default_cells_cfg(4);
+  std::vector<sched_nr_interface::cell_cfg_t> cells_cfg = get_default_cells_cfg(nof_sectors);
 
   sched_nr_sim_base sched_tester(cfg, cells_cfg, "Parallel CC Test");
 
@@ -174,16 +188,19 @@ void sched_nr_cfg_parallel_cc_test()
   sched_tester.add_user(0x46, uecfg, 0);
 
   for (uint32_t nof_ttis = 0; nof_ttis < max_nof_ttis; ++nof_ttis) {
-    tti_point tti(nof_ttis % 10240);
-    sched_tester.slot_indication(tti);
+    tti_point tti_rx(nof_ttis % 10240);
+    tti_point tti_tx = tti_rx + TX_ENB_DELAY;
+    tasks.start_slot(tti_tx, nof_sectors);
+    sched_tester.new_slot(tti_tx);
     for (uint32_t cc = 0; cc < cells_cfg.size(); ++cc) {
-      tasks.start_task();
-      srsran::get_background_workers().push_task([cc, tti, &tasks, &sched_tester]() {
-        sched_nr_interface::tti_request_t res;
-        TESTASSERT(sched_tester.get_sched()->generate_sched_result(tti, cc, res) == SRSRAN_SUCCESS);
-        sched_nr_cc_output_res_t out{tti, cc, &res.dl_res, &res.ul_res};
+      srsran::get_background_workers().push_task([cc, tti_tx, &tasks, &sched_tester]() {
+        sched_nr_interface::dl_sched_t dl_res;
+        sched_nr_interface::ul_sched_t ul_res;
+        TESTASSERT(sched_tester.get_sched()->get_dl_sched(tti_tx, cc, dl_res) == SRSRAN_SUCCESS);
+        TESTASSERT(sched_tester.get_sched()->get_ul_sched(tti_tx, cc, ul_res) == SRSRAN_SUCCESS);
+        sched_nr_cc_output_res_t out{tti_tx, cc, &dl_res, &ul_res};
         sched_tester.update(out);
-        tasks.finish_task(res);
+        tasks.finish_cc(tti_tx, dl_res, ul_res);
       });
     }
   }
@@ -191,6 +208,7 @@ void sched_nr_cfg_parallel_cc_test()
   tasks.wait_task_finish();
 
   tasks.print_results();
+  TESTASSERT(tasks.pdsch_count == (int)(max_nof_ttis * nof_sectors * 0.6));
 }
 
 void sched_nr_cfg_parallel_sf_test()
@@ -211,13 +229,14 @@ void sched_nr_cfg_parallel_sf_test()
 
   for (uint32_t nof_ttis = 0; nof_ttis < max_nof_ttis; ++nof_ttis) {
     tti_point tti(nof_ttis % 10240);
-    sched.slot_indication(tti);
+    tasks.start_slot(tti, nof_sectors);
     for (uint32_t cc = 0; cc < cells_cfg.size(); ++cc) {
-      tasks.start_task();
       srsran::get_background_workers().push_task([cc, &sched, tti, &tasks]() {
-        sched_nr_interface::tti_request_t res;
-        TESTASSERT(sched.generate_sched_result(tti, cc, res) == SRSRAN_SUCCESS);
-        tasks.finish_task(res);
+        sched_nr_interface::dl_sched_t dl_res;
+        sched_nr_interface::ul_sched_t ul_res;
+        TESTASSERT(sched.get_dl_sched(tti, cc, dl_res) == SRSRAN_SUCCESS);
+        TESTASSERT(sched.get_ul_sched(tti, cc, ul_res) == SRSRAN_SUCCESS);
+        tasks.finish_cc(tti, dl_res, ul_res);
       });
     }
   }