达到“研究级技术报告”水准

sim/core/metrics.py

@@ -273,6 +273,10 @@ class MetricsCollector:
         """Record hop count for a packet."""
         self.metrics.hop_counts.append(hops)
 
+    def record_packet_received(self, src: int, seq: int):
+        """Record a packet received at sink (for PDR calculation)."""
+        self.metrics.received_packet_ids.add((src, seq))
+
     # =========================================================================
     # Channel Utilization Tracking
     # =========================================================================