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With the pervasive deployment of various wireless communication systems, heterogeneous network environments are attracting much attention from academia and industry. Along with the advent of such environments, user devices begin to support multiple network interfaces simultaneously. This opens a possibility for a Mobile Collaborative Community (MCC), a(More)
— This paper proposes and evaluates a new aggrega-tion algorithm in wireless sensor networks with time constraint. In the proposed algorithm, each aggregation node controls its aggregation time in order to aggregate and transfer data from child nodes within a given deadline of the sink node. The objective of the algorithm is to deliver the time constrained(More)
In this paper, we deal with a cost minimization problem for a multihomed mobile terminal that downloads and plays a video-on-demand (VoD) stream. The cost consists of the user's dissatisfaction due to playback disruptions and communication cost for downloading the VoD stream. There are three components in our approach: parameter estimation, threshold(More)
—In wireless networks, maximizing throughput and minimizing energy consumption are two conflicting objectives. For elastic traffic, it is important to enhance the throughput since it directly affects the quality-of-service (QoS) of users. At the same time, the energy consumption should be minimized in order to prolong the battery lifetime of the mobile(More)
This paper considers a location system where a number of deployed sensor nodes collaborate with objects that need to be localized. Unlike existing works, we focus on reducing the energy consumption of the sensor nodes, which are assumed to be static and run on limited battery power. To minimize the total wake-up time of the sensor nodes, we control the(More)