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Due to sparse network density, geographic routing in Intermittently Connected Networks (ICNs) suffers from challenges for making the feasible routing decision and handling the local maximum problem, which is in contrast with the conventional geographic approaches in Mobile Ad hoc NETworks (MANETs) relying on high network density. In this paper, the authors firstly explore the Delegation Replication (DR) approach to overcome the limitation of the geometric metric adopted in their proposed Come Phase to promote message replication coming towards destination, requiring pairwise encountered nodes moving towards destination.
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