feature - make minimum SNR, under which the RRC is notified with UL KO, configurable

lib/include/srsran/interfaces/enb_mac_interfaces.h

@@ -25,6 +25,7 @@ struct mac_args_t {
   int                           nr_tb_size = -1;
   uint32_t                      nof_prealloc_ues; ///< Number of UE resources to pre-allocate at eNB startup
   uint32_t                      max_nof_kos;
+  int                           rlf_min_ul_snr_estim;
 };
 
 /* Interface PHY -> MAC */

srsenb/enb.conf.example

@@ -338,6 +338,8 @@ enable = false
 # gtpu_tunnel_timeout:  Time that GTPU takes to release indirect forwarding tunnel since the last received GTPU PDU (0 for no timer).
 #ts1_reloc_prep_timeout: S1AP TS 36.413 TS1RelocPrep Expiry Timeout value in milliseconds
 #ts1_reloc_overall_timeout: S1AP TS 36.413 TS1RelocOverall Expiry Timeout value in milliseconds
+# rlf_release_timer_ms: Time taken by eNB to release UE context after it detects an RLF
+# rlf_min_ul_snr_estim: SNR threshold in dB below which the enb is notified with rlf ko
 #
 #####################################################################
 [expert]
@@ -369,3 +371,5 @@ enable = false
 #extended_cp         = false
 #ts1_reloc_prep_timeout = 10000
 #ts1_reloc_overall_timeout = 10000
+#rlf_release_timer_ms = 4000
+#rlf_min_ul_snr_estim = -2

srsenb/src/main.cc

@@ -241,6 +241,7 @@ void parse_args(all_args_t* args, int argc, char* argv[])
     ("expert.extended_cp", bpo::value<bool>(&args->phy.extended_cp)->default_value(false), "Use extended cyclic prefix")
     ("expert.ts1_reloc_prep_timeout", bpo::value<uint32_t>(&args->stack.s1ap.ts1_reloc_prep_timeout)->default_value(10000), "S1AP TS 36.413 TS1RelocPrep Expiry Timeout value in milliseconds")
     ("expert.ts1_reloc_overall_timeout", bpo::value<uint32_t>(&args->stack.s1ap.ts1_reloc_overall_timeout)->default_value(10000), "S1AP TS 36.413 TS1RelocOverall Expiry Timeout value in milliseconds")
+    ("expert.rlf_min_ul_snr_estim", bpo::value<int>(&args->stack.mac.rlf_min_ul_snr_estim)->default_value(-2), "SNR threshold in dB below which the eNB is notified with rlf ko.")
 
 
     // eMBMS section

srsenb/src/stack/mac/mac.cc

@@ -401,7 +401,7 @@ int mac::snr_info(uint32_t tti_rx, uint16_t rnti, uint32_t enb_cc_idx, float snr
     return SRSRAN_ERROR;
   }
 
-  rrc_h->set_radiolink_ul_state(rnti, snr > 0);
+  rrc_h->set_radiolink_ul_state(rnti, snr >= args.rlf_min_ul_snr_estim);
 
   return scheduler.ul_snr_info(tti_rx, rnti, enb_cc_idx, snr, (uint32_t)ch);
 }