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| creator |
Dürr, Frank
| | Rothermel, Kurt
| | date |
2006-10-09
| | | | description |
Geocast, which allows for forwarding messages to hosts residing at
specified geographic areas, is a promising communication paradigm
with a wide range of applications. Geocast target areas can be
specified either by geometric figures or symbolic addresses, such as
/usa/fl/miami/market-street.
In this paper, we present a novel geocast routing protocol for
symbolically addressed messages. Compared to geocast protocols based
on geometric information, our protocol can operate on simple
symbolic location models, and message forwarding does not require
costly geometric operations. The proposed protocol is based on an
overlay network that is mapped to an IP-based network
infrastructure. The overlay network is structured in a hierarchical
fashion, to ensure a scalable global geocast service supporting also
large target areas. Although our protocol does not rely on a layer 3
multicast protocol, we also show how to improve the performance of
message forwarding by integrating a light-weight layer 3 multicast
protocol. Our evaluations of the protocol underline the scalability
of our approach and show good routing quality leading to short
message paths.
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