Transmit Msg3 only if available (2)

srsue/hdr/mac/mux.h

@@ -67,6 +67,9 @@ public:
   
   void     msg3_flush();
   bool     msg3_is_transmitted();
+
+  void     msg3_prepare();
+  bool     msg3_is_pending();
   
   void     append_crnti_ce_next_tx(uint16_t crnti); 
   
@@ -105,6 +108,7 @@ private:
   /* PDU Buffer */
   srslte::sch_pdu    pdu_msg; 
   bool msg3_has_been_transmitted;
+  bool msg3_pending;
 };
 
 } // namespace srsue

srsue/hdr/mac/ul_harq.h

@@ -238,7 +238,7 @@ private:
           reset();
 
           // Uplink grant in a RAR and there is a PDU in the Msg3 buffer
-          if (grant->is_from_rar && !harq_entity->mux_unit->msg3_is_transmitted()) {
+          if (grant->is_from_rar && harq_entity->mux_unit->msg3_is_pending()) {
             Debug("Getting Msg3 buffer payload, grant size=%d bytes\n", grant->n_bytes[0]);
             pdu_ptr  = harq_entity->mux_unit->msg3_get(payload_buffer, grant->n_bytes[0]);
             if (pdu_ptr) {
@@ -246,6 +246,7 @@ private:
             } else {
               Warning("UL RAR grant available but no Msg3 on buffer\n");
             }
+            printf("Transmitted Msg3\n");
 
             // Normal UL grant
           } else {

srsue/src/mac/mux.cc

@@ -65,6 +65,7 @@ void mux::reset()
   for (uint32_t i=0;i<lch.size();i++) {
     lch[i].Bj = 0;
   }
+  msg3_pending = false;
   pending_crnti_ce = 0;
 }
 
@@ -343,7 +344,8 @@ void mux::msg3_flush()
   if (log_h) {
     Debug("Msg3 buffer flushed\n");
   }
-  msg3_has_been_transmitted = false; 
+  msg3_has_been_transmitted = false;
+  msg3_pending = false;
   bzero(msg3_buff, sizeof(MSG3_BUFF_SZ));
 }
 
@@ -352,6 +354,14 @@ bool mux::msg3_is_transmitted()
   return msg3_has_been_transmitted; 
 }
 
+void mux::msg3_prepare() {
+  msg3_pending = true;
+}
+
+bool mux::msg3_is_pending() {
+  return msg3_pending;
+}
+
 /* Returns a pointer to the Msg3 buffer */
 uint8_t* mux::msg3_get(uint8_t *payload, uint32_t pdu_sz)
 {
@@ -363,6 +373,7 @@ uint8_t* mux::msg3_get(uint8_t *payload, uint32_t pdu_sz)
     }
     memcpy(payload, msg3_buff_start_pdu, sizeof(uint8_t)*pdu_sz);
     msg3_has_been_transmitted = true;
+    msg3_pending = false;
     return payload;
   } else {
     Error("Msg3 size (%d) is longer than internal msg3_buff size=%d, (see mux.h)\n", pdu_sz, MSG3_BUFF_SZ-32);

srsue/src/mac/proc_ra.cc

@@ -349,7 +349,8 @@ void ra_proc::tb_decoded_ok() {
         // Preamble selected by Network
         state = COMPLETION; 
       } else {
-        // Preamble selected by UE MAC 
+        // Preamble selected by UE MAC
+        mux_unit->msg3_prepare();
         rntis->temp_rnti = rar_pdu_msg.get()->get_temp_crnti();
         phy_h->pdcch_dl_search(SRSLTE_RNTI_TEMP, rar_pdu_msg.get()->get_temp_crnti());