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In a disruption/delay tolerant network, message carriers are often used to act as relays between segregated nodes and gateways. In this paper, we study a special routing problem for message carriers in delay tolerant networks, the visiting frequency problem. Specifically, we present a detailed analysis on a near-optimal visiting frequency on the nodes in a subregion of the network, to ensure low average...
In situations where communication infrastructures are destroyed or do not exist at all, implementing a disruption/delay-tolerant network (DTN) may be the only choice. A special type of DTN, which is known as a pigeon network, utilizes controllable special-purpose vehicles called pigeons to convey messages among segregated nodes and gateways. This paper studies a basic scenario in a pigeon network,...
In this paper, we sought to understand the reasons causing failures and delays of message delivery in Delay Tolerant Networks (DTN), and to use this understanding for improving the network. By studying two real-world datasets, we found that node isolation is prevalent, which largely accounts for the inefficiencies in DTN's message delivery. In addition, by analyzing nodes' contact-location relationship,...
In this paper, we analyze a new type of delay tolerant networks (DTN) where each node owns multiple dedicated messengers, called pigeons. The only form of inter- node communication is for a pigeon to periodically carry a batch of messages originated at the home node, deliver to the corresponding destination nodes and return home. We name this as homing-pigeon (HoP) based routing mechanism, which is...
Routing algorithm is the key part of public traffic query system. It is important in GIS applications. This paper investigates a lot of the public traffic routing algorithm, analyzes the bus transit networkpsilas characteristic, and therefore constructs a new model of the least times transfer priority algorithm based on database. The algorithm takes the least times transfer as the first goal, considering...
The development of delay tolerant networks (DTN) has attracted significant attention in the networking research community. In this paper, we investigate a new type of delay tolerant network - homing pigeon based DTN (HoP-DTN) system. In HoP-DTN, each node owns multiple dedicated messengers (called pigeons), and each pigeon will take a round trip starting from its home, through the destination nodes...
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