Selected NR RA procedure PRACH send timeout according to system frame number period from PRACH PHY tables

srsue/hdr/stack/mac_nr/proc_ra_nr.h

@@ -51,6 +51,10 @@ public:
   void reset();
 
 private:
+  static const uint32_t PRACH_SEND_CALLBACK_TIMEOUT =
+      16 * 10; ///< Limited from frame system number opportunity period in TS 38.211 tables 6.3.3.2-2, 6.3.3.2-3
+               ///< and 6.3.3.2-4
+
   mac_interface_proc_ra_nr&             mac;
   srslog::basic_logger&                 logger;
   phy_interface_mac_nr*                 phy        = nullptr;

srsue/src/stack/mac_nr/proc_ra_nr.cc

@@ -172,7 +172,7 @@ void proc_ra_nr::ra_preamble_transmission()
   // instruct the physical layer to transmit the Random Access Preamble using the selected PRACH occasion, corresponding
   // RA-RNTI (if available), PREAMBLE_INDEX, and PREAMBLE_RECEIVED_TARGET_POWER.
   phy->send_prach(prach_occasion, preamble_index, preamble_received_target_power);
-  prach_send_timer.set(100, [this](uint32_t tid) { timer_expired(tid); }); // TODO find a suitable 100?
+  prach_send_timer.set(PRACH_SEND_CALLBACK_TIMEOUT, [this](uint32_t tid) { timer_expired(tid); });
   prach_send_timer.run();
   state = WAITING_FOR_PRACH_SENT;
 }