T3502 handling

src/ue/mm/register.cpp

@@ -857,7 +857,6 @@ void NasMm::resetRegAttemptCounter()
     // Additionally, the registration attempt counter shall be reset when the UE is in substate
     // 5GMM-DEREGISTERED.ATTEMPTING-REGISTRATION or 5GMM-REGISTERED.ATTEMPTING-REGISTRATION-UPDATE, and:
     // - a new tracking area is entered;
-    // - timer T3502 expires; or
     // - timer T3346 is started.
 }
 

src/ue/mm/timer.cpp

@@ -33,6 +33,15 @@ void NasMm::onTimerExpire(nas::NasTimer &timer)
         }
         break;
     }
+    case 3502: {
+        if (m_mmSubState == EMmSubState::MM_DEREGISTERED_ATTEMPTING_REGISTRATION ||
+            m_mmSubState == EMmSubState::MM_REGISTERED_ATTEMPTING_REGISTRATION_UPDATE)
+        {
+            logExpired();
+            resetRegAttemptCounter();
+        }
+        break;
+    }
     case 3510: {
         if (m_mmState == EMmState::MM_REGISTERED_INITIATED)
         {