Research Article

An Improved Opportunistic Routing Protocol for Intermittently Connected Delay Tolerant Wireless Sensor Networks

Table 1

Parameter values.

ParameterValue

Area size (m2)4,500 × 3,400
RouterPRoPHET router
Pencounter0.75
0.98
0.25
Time unit for K (s)30
Movement modelPedestrians, car: shortest path map based movement tram: map route movement
Speed (m/s)Pedestrian: U[0.5, 1.5], car: U[2.7, 13.9], tram: U[7,10]
Number of nodesTotal = 100 (default value, pedestrians = 62, car = 31, tram = 6, sink node = 1)
Simulation time (s)43,200
Transmission range (m)10
Packet transmission speed (kbps)250
Buffer size (Mbytes)10, 20, 30 (default value), 40, 50, 60, 70, 80, 90, 100,
Message interval (s)12 (high traffic load), 60 (medium traffic load), 300 (low traffic load)
Message size (bytes)U[500 k∼1 M]