MAC: Set sensible RAC/BSR defaults (maxRacAttempts=10, racBackoffMax=20)

Author: avarga

src/simu5g/stack/mac/LteMacUe.ned

@@ -27,9 +27,9 @@ simple LteMacUe extends LteMacBase
         @class("LteMacUe");
         string collectorModule = default("");
 
-        int maxRacAttempts = default(0);       // preambleTransMax; max RAC attempts (0 = give up after first failure)
+        int maxRacAttempts = default(10);      // preambleTransMax; max RAC attempts (0 = give up after first failure)
         int racBackoffMin = default(0);        // min random backoff (TTIs) after failed RAC
-        int racBackoffMax = default(0);        // max random backoff (TTIs) after failed RAC (0 = no backoff, instant retry)
+        int racBackoffMax = default(20);       // max random backoff (TTIs) after failed RAC (0 = no backoff, instant retry)
         int raResponseWindow = default(3);     // ra-ResponseWindow: TTIs to wait before retrying RAC
         int retxBsrTimer = default(40);        // retxBSR-Timer: BSR retransmission timer (TTIs; 0 = disabled)
 }