Assumes probability falls off gradually with distance src dst N1 N2 N3 N4 75 50

# Assumes probability falls off gradually with distance

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Assumes probability falls off gradually with distance src dst N1 N2 N3 N4 75% 50% N5 25% Example scenarios 8 CSE 222A – Lecture 18: Mesh Networking

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Issues to Address What we want: an effective protocol with low overhead How often should ExOR run? u Per packet is expensive u Use batches Who should participate the forwarding? u Too many participants cause large overhead When should each participant forward? u Avoid simultaneous transmissions What should each participant forward? u Avoid duplicate transmissions 9 CSE 222A – Lecture 18: Mesh Networking
Who should participate? A background process collects ETX information via periodic link-state flooding. The source chooses the participants (forwarder list) using ETX-like metric. u Only consider forward delivery rate » Why? u The source runs a simulation and selects only the nodes which transmit at least 10% of the total transmission in a batch. 10 CSE 222A – Lecture 18: Mesh Networking

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Forwarders are prioritized by ETX-like metric to the destination The highest priority forwarder transmits when the batch ends The remaining forwarders transmit in prioritized order Question: How does each forwarder know it is its turn to transmit? u Assume other higher priority nodes send for five packet durations if not hearing anything from them When to forward?
• Fall '08
• Vahdat,A
• Wireless mesh network, exOr

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