11 CSE 222A Lecture 18 Mesh Networking ExOR batching Source estimates ETX

11 cse 222a lecture 18 mesh networking exor batching

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11 CSE 222A – Lecture 18: Mesh Networking
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ExOR batching Source estimates ETX between each node and the destination Source decides on a list of forwarders and prioritizes the list. Let the list be (dst, N4, N3, N2, N1) Node closest to the dst sends the overheard packet first u Other nodes listen, send remaining packets in turn src N3 dst N4 tx: 23 tx: 57 -23 @ 34 tx: @ 31 rx: 23 rx: 57 rx: 88 tx: 0 tx: @ 12 N1 N2 rx: 45 rx: 18 12 CSE 222A – Lecture 18: Mesh Networking
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Which packets: Batch maps Batch map indicates, for each packet in a batch, the highest-priority node known to have received a copy of that packet. N0 N1 N2 N3 1 st round Tx: 1, 2, 3, 4, 5, 6, 7, 8 Forwarder list: N3(dst), N2, N1, N0 (src) Rx:2,5,8 Rx: 2,4 Rx: 1,2,7,8 Batch map: 03030000 Batch map: 03032002 Batch map: 13032012 Tx: batch map only Tx: 5,8 Tx: 1,7 2 nd round Tx: 3,6 Batch map: 13032012 13 CSE 222A – Lecture 18: Mesh Networking
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End Game A nodes stops sending the remaining packets in the batch if its batch map indicates over 90% of this batch has been received by higher priority nodes. The remaining packets transferred with traditional routing. 14 CSE 222A – Lecture 18: Mesh Networking
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Example Forwarder list: N24( dst ), N20, N18, N11, N8, N17, N13, N5( src ) 15 CSE 222A – Lecture 18: Mesh Networking
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Using ExOR with TCP Node Proxy ExOR Gateway Web Proxy Client PC Web Server TCP TCP ExOR Batches (not TCP) Batching requires more packets than typical TCP window 16 CSE 222A – Lecture 18: Mesh Networking
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Evaluation on Roofnet 1 kilometer 17 CSE 222A – Lecture 18: Mesh Networking
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65 Node pairs 1.0-MB file transfer 1 Mbit/s 802.11 bit rate
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  • Fall '08
  • Vahdat,A
  • Wireless mesh network, exOr

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