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A Proposal of Link Metric for Next-Hop
Forwarding Methods in Vehicular Ad Hoc
Networks
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指 導 教 授 ：許 子 衡
學
生：董藝興
教授
Outline
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 Introduction
 Next-Hop forwarding method
 Proposed Selection Scheme
 Performance evaluation
Introduction
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 Compared with topology-based routing protocols,
a
routing
protocol
using
GPS
position
information offers the possibility to alleviate
issues of scalability or control overhead.
A
next-hop forwarding method is a type of
position-based routing protocol.
Introduction
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 The
easiest scheme is greedy forwarding, in
which the neighbor node closest to the
destination node is selected as the next-hop node.
 This forwarding method requires the minimum
number of hops from the source node to the
destination node, but the forwarding distance of
one hop might be large.
Next-Hop forwarding method
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Next-Hop forwarding method
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Proposed Selection Scheme
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 Expected Progress Distance
 Expected transmission time(ETT)
 S is the packet size
 B is the transmission rate
 ETX is the expected number of transmissions
Proposed Selection Scheme
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 Where pf and pr are the packet error rates of
forward and reverse links, respectively.
Proposed Selection Scheme
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Performance evaluation
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Performance evaluation
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Performance evaluation
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Performance evaluation
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Performance evaluation
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Performance evaluation
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Performance evaluation
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