This paper focuses on the routing protocol for
driving safety that vehicle collects state message from roadside
sensors in VANET-WSN. Routing Protocol for Low Power and
Lossy Networks (RPL), a tree-based routing protocol, adapts
naturally to our routing requirement. But RPL is designed for
static wireless sensor network, so we need to modify RPL to fit
in with high dynamic topology of VANET-WSN. For the first
time, we utilize Geographical Information (GI) as the metric
for RPL (GI-RPL), which lets RPL in a timely fashion. We also
propose some strategies for tuning RPL in VANET-WSN. To
demonstrate the performance of GI-RPL, we set up a
simulation by using Cooja and compare with another modified
RPL. The result of simulation shows that GI-RPL has high
Package Delivery Ratio (PDR), reasonable overhead and low
delay.
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