一个具备科研可验证性的 LoRa 多跳算法评估基线。

sim/radio/channel.py

@@ -5,6 +5,7 @@ Implements:
 - Broadcast propagation to all nodes in range
 - Airtime occupation tracking
 - Collision detection (time overlap + |RSSI1 - RSSI2| < 6 dB)
+- Transmission statistics for efficiency analysis
 """
 
 import simpy
@@ -25,6 +26,7 @@ class Transmission:
     end_time: float
     rssi: float
     channel_busy_until: float
+    airtime: float = 0.0  # Add airtime field
 
 
 @dataclass
@@ -46,6 +48,7 @@ class Channel:
     - Transmissions and their time slots
     - Collision detection based on time overlap and RSSI difference
     - Packet delivery to nodes within range
+    - Transmission statistics for efficiency analysis
     """
 
     COLLISION_RSSI_DIFF_DB = 6.0  # RSSI difference threshold for collision
@@ -61,6 +64,13 @@ class Channel:
         self.transmissions: List[Transmission] = []
         self.collision_count = 0
 
+        # Efficiency metrics
+        self.total_transmissions = 0
+        self.total_airtime = 0.0
+        self.hello_transmissions = 0
+        self.data_transmissions = 0
+        self.ack_transmissions = 0
+
         # Callback for packet reception (set by node manager)
         self.receive_callback: Optional[Callable[[int, ReceivedPacket], None]] = None
 
@@ -85,11 +95,18 @@ class Channel:
         # Calculate packet size and airtime
         if packet.is_hello:
             pkt_airtime = airtime_calc.get_hello_airtime()
+            self.hello_transmissions += 1
         elif packet.is_ack:
             pkt_airtime = airtime_calc.get_ack_airtime()
+            self.ack_transmissions += 1
         else:  # DATA
             payload_size = len(packet.payload) if packet.payload else 16
             pkt_airtime = airtime_calc.get_data_airtime(payload_size)
+            self.data_transmissions += 1
+
+        # Track transmission statistics
+        self.total_transmissions += 1
+        self.total_airtime += pkt_airtime
 
         start_time = self.env.now
         end_time = start_time + pkt_airtime
@@ -115,6 +132,7 @@ class Channel:
             end_time=end_time,
             rssi=sender_rssi,
             channel_busy_until=end_time,
+            airtime=pkt_airtime,
         )
 
         if colliding:
@@ -253,7 +271,22 @@ class Channel:
             return self.env.now
         return max(t.channel_busy_until for t in self.transmissions)
 
+    def get_efficiency_metrics(self) -> dict:
+        """Get efficiency metrics for analysis."""
+        return {
+            "total_transmissions": self.total_transmissions,
+            "total_airtime": self.total_airtime,
+            "hello_transmissions": self.hello_transmissions,
+            "data_transmissions": self.data_transmissions,
+            "ack_transmissions": self.ack_transmissions,
+        }
+
     def reset(self):
         """Reset channel state."""
         self.transmissions.clear()
         self.collision_count = 0
+        self.total_transmissions = 0
+        self.total_airtime = 0.0
+        self.hello_transmissions = 0
+        self.data_transmissions = 0
+        self.ack_transmissions = 0