ue,proc_ra_nr: add temporary flag to skip RAR reception

this will be removed again as soon as the eNB supports full RAR
transmission.

lib/include/srsran/interfaces/mac_interface_types.h

@@ -131,6 +131,7 @@ struct rach_nr_cfg_t {
   uint32_t powerRampingStep;
   uint32_t ra_responseWindow;
   uint32_t ra_ContentionResolutionTimer;
+  bool     skip_rar;
 
   rach_nr_cfg_t() { reset(); }
   void reset()
@@ -140,6 +141,7 @@ struct rach_nr_cfg_t {
     powerRampingStep            = 0;
     preambleTransMax            = 0;
     ra_responseWindow           = 0;
+    skip_rar                    = false;
   }
 };
 

srsue/hdr/stack/rrc/rrc_nr.h

@@ -42,6 +42,7 @@ struct rrc_nr_args_t {
   core_less_args_t      coreless;
   uint32_t              sim_nr_meas_pci;
   bool                  pdcp_short_sn_support;
+  bool                  skip_rar;
   std::string           supported_bands_nr_str;
   std::vector<uint32_t> supported_bands_nr;
   std::vector<uint32_t> supported_bands_eutra;

srsue/src/main.cc

@@ -132,6 +132,7 @@ static int parse_args(all_args_t* args, int argc, char* argv[])
     ("rrc.mbms_service_port",   bpo::value<uint32_t>(&args->stack.rrc.mbms_service_port)->default_value(4321),                    "Port of the MBMS service")
     ("rrc.nr_measurement_pci",  bpo::value<uint32_t>(&args->stack.rrc_nr.sim_nr_meas_pci)->default_value(500),                    "NR PCI for the simulated NR measurement")
     ("rrc.nr_short_sn_support", bpo::value<bool>(&args->stack.rrc_nr.pdcp_short_sn_support)->default_value(true),                 "Announce PDCP short SN support")
+    ("rrc.skip_nr_rar",         bpo::value<bool>(&args->stack.rrc_nr.skip_rar)->default_value(false),                             "Whether to skip RAR reception (temporary feature)")
 
     ("nas.apn",               bpo::value<string>(&args->stack.nas.apn_name)->default_value(""),          "Set Access Point Name (APN) for data services")
     ("nas.apn_protocol",      bpo::value<string>(&args->stack.nas.apn_protocol)->default_value(""),  "Set Access Point Name (APN) protocol for data services")

srsue/src/stack/mac_nr/proc_ra_nr.cc

@@ -344,6 +344,12 @@ void proc_ra_nr::prach_sent(uint32_t tti, uint32_t s_id, uint32_t t_id, uint32_t
     ra_window_start  = TTI_ADD(tti, 3);
     logger.debug("Calculated ra_window_start=%d, ra_window_length=%d", ra_window_start, ra_window_length);
     state = WAITING_FOR_RESPONSE_RECEPTION;
+
+    if (rach_cfg.skip_rar) {
+      // temp hack for NSA eNB development
+      state = WAITING_FOR_COMPLETION;
+      ra_completion();
+    }
   });
 }
 

srsue/src/stack/rrc/rrc_nr.cc

@@ -870,6 +870,7 @@ bool rrc_nr::apply_ul_common_cfg(const asn1::rrc_nr::ul_cfg_common_s& ul_cfg_com
     if (ul_cfg_common.init_ul_bwp.rach_cfg_common_present) {
       if (ul_cfg_common.init_ul_bwp.rach_cfg_common.type() == setup_release_c<rach_cfg_common_s>::types_opts::setup) {
         rach_nr_cfg_t rach_nr_cfg = make_mac_rach_cfg(ul_cfg_common.init_ul_bwp.rach_cfg_common.setup());
+        rach_nr_cfg.skip_rar      = args.skip_rar;
         mac->set_config(rach_nr_cfg);
 
         // Make the RACH configuration for PHY