Structured P2P Overlay of Mobile Brokers for Realizing Publish/Subscribe Communication in VANET
Table 1
Simulation parameters.
(1) Traffic type
Vehicle density
Time of the day
No. of vehicles
Peak traffic
07:00–10:00 and 17:00–19:00
800 to 1000
Moderate traffic
10:00–17:00 and 19:00–00:00
300 to 500
Low traffic
00:00–7:00
100 to 300
(2) Vehicle properties
Maximum speed of ordinary vehicle = 65 km/hour Maximum speed of city buses = 45 km/hour City bus pause time at bus stops = 3 minutes No. of city buses = 15% of total vehicles Maximum number of publishers at a time: 20% of total vehicles Maximum number of subscribers at a time: 40% of total vehicles
(3) Ad hoc communication properties
Protocol used: 802.11p Transmission range of vehicles: 200 meters Identification broadcast period of city bus: 5 seconds
Central server: one Number of city buses: zero Number of info-stations: variable Transmission range of info-stations: 200 meters Protocol used (for ad hoc communications): 802.11p Protocol used (for infrastructure communications): TCP/IP
(6) For Comparison-Scenario-2
Number of city buses: zero Number of info-stations: zero Protocol used (for ad hoc communications): 802.11p Protocol used (for infrastructure communications): TCP/IP
