sched_nr: add ue_exists() helper

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

@@ -41,6 +41,7 @@ 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 ue_rem(uint16_t rnti) override;
+  bool ue_exists(uint16_t rnti) override;
 
   int dl_rach_info(uint32_t cc, const dl_sched_rar_info_t& rar_info);
 

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

@@ -119,6 +119,7 @@ public:
   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 ue_rem(uint16_t rnti)                                                 = 0;
+  virtual bool ue_exists(uint16_t rnti)                                              = 0;
   virtual int  get_dl_sched(slot_point slot_rx, uint32_t cc, dl_sched_res_t& result) = 0;
   virtual int  get_ul_sched(slot_point slot_rx, uint32_t cc, ul_sched_t& result)     = 0;
 

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

@@ -100,6 +100,11 @@ void sched_nr::ue_rem(uint16_t rnti)
   sched_workers->enqueue_event(rnti, [this, rnti]() { ue_db.erase(rnti); });
 }
 
+bool sched_nr::ue_exists(uint16_t rnti)
+{
+  return ue_db.contains(rnti);
+}
+
 void sched_nr::ue_cfg_impl(uint16_t rnti, const ue_cfg_t& uecfg)
 {
   if (not ue_db.contains(rnti)) {