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In a P2P network, it is common that data items are replicated on multiple peers for improving data availability. In such an environment, when a data item is updated on a particular peer, the update should be immediately propagated to other peers holding its replicas. However, in some applications, some replica holders do not need the update when the degree of change in the update is small. In this...
In ad hoc networks, to acquire only necessary data items, it is effective that each mobile node retrieves data items using a top-k query, in which data items are ordered by the score of a particular attribute, and the query-issuing mobile node acquires data items with the k highest scores. In this paper, we propose a message processing method for a top-k query for reducing traffic and keeping the...
In mobile ad hoc networks, when a mobile host receives a data request from another host, the host usually transmits the requested data item by unicast. However, if mobile hosts hold data items that are frequently requested by others, they have to transmit the data items many times and consume a large amount of power. In this paper, we propose a data transmission method for not only maintaining data...
Advances in wireless communication technology have led to an increasing interest in mobile sensor networks.In our previous work, we proposed a method that controls the movement of sensor nodes by using push-based broadcast and communication among nodes.In this method, nodes autonomously move based on the broadcast information on where they can communicate with the sink,and they construct a temporal...
In mobile sensor networks with a small number of nodes, because nodes' radio communication range does not cover the whole sensing area, every node has to move closer to the data sink to deliver its sensed data. Thus, the power consumption to deliver the sensed data to the data sink becomes large. In this paper, we propose two novel methods that nodes construct a temporal network to deliver the sensed...
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