Chikara Sasaki

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Network coding is a novel technique to improve network throughput and performance by efficient encoding over the intermediate nodes in the network and works particularly well in multicasting. We expect that network coding will reduce the bandwidth utilization of IP broadcasting services that provide multichannel services and high quality videos using IP(More)
The rapid increase in traffic is a serious problem for mobile carriers. As the radio spectrum is a limited resource and mobile traffic is expected to continue increasing, utilizing multi-frequency bands will play an increasingly prominent role in relieving traffic overload. Extremely high-frequency bands, such as millimeter wave bands, can provide(More)
The growth of the Internet has facilitated data collection on a large scale. User opinions and behavior are private information and need to be collected using a method that protects their confidentiality. In this paper, we develop a method of collecting information that employs probability conversion. We make clear the relations among the answer functions'(More)
In this paper, we present a multicast tree discovery scheme reducing the number of routers to access. Recently, the broadcasting of rich content via IP multicast has been increasing. Network and/or service operators require continuous and accurate multicast tree discovery because a multicast tree can be changed dynamically by join/leave events among users,(More)
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