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Opportunistic Routing in Multi-Sink Mobile Ad Hoc Wireless Sensor ...

Opportunistic Routing in Multi-Sink Mobile Ad Hoc Wireless Sensor ...

Reduction of Collision

Reduction of Collision Rate Synchronization to Beacon Signals ● Sink beacons are transmitted without CSMA/CA (collisions) ● Beacon Period (BP) t BP =t 1 S b −t 1 S b −1 1 ● ● Next Contention Free Period (CFP) t next CFP =t S b t n BP n CFPs set Timing Table of Beacon Inter-Frame Spacing (BIFS) ● Complex structure, most collisions appear due to inappropriate beacon forwarding time ikom - ComNets

Reduction of Collision Rate Random Beacon Forwarding ● Simultaneous beacon forwarding causes high collision rate – Problem of RNG in OPNET. Results are dependent on RNS ikom - ComNets ● Multiple beacons from different sinks arriving with close interval will cause redundant beacon forwarding ● Introducing Random Beacon Forwarding Delay – forward: time of beacon forwarding – simulation: current time – wait_beacon: interval of waiting for several beacons – random: random waiting time (more randomness for CSMA/CA backoff) ● Simple structure, no additional coordination ● Reduced collision ratio

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