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In the future Internet of Things (IoT), battery-powered devices equipped with short range radios may need to communicate with each other over multi-hop links. This may significantly increase their energy consumption. Whereas most research on IoT assumes that the devices use energy-efficient IEEE 802.15.4 wireless transceivers, we focus on IEEE 802.11(More)
Keywords: Internet of Things IEEE 802.11 Power saving Ad hoc networks Multi-hop networks a b s t r a c t The Future Internet of Things (IoT) will connect billions of battery-powered radio-enabled devices. Some of them may need to communicate with each other and with Internet gateways (border routers) over multi-hop links. While most IoT scenarios assume(More)
Ad hoc networks of wireless devices carried by theme park visitors can be used to support variety of services. In such networks, links between the devices sporadically appear and disappear with the mobility of visitors. The network performance strongly depends on how often they encounter each other and for how long the contact opportunities last. In this(More)
In this paper, we study the performance of the proportional fair scheduler, which has been proposed for the emerging 3.5G radio access systems. It maximizes the spectral efficiency of the systems, which is a strong incentive for network providers to use it. Our goal is to investigate whether the proportional fair scheduler also provides benefits to the(More)
We describe an application of the Legendre transform to communication networks. The Legendre transform applied to max-plus algebra linear systems corresponds to the Fourier transform applied to conventional linear systems. Hence, it is a powerful tool that can be applied to max-plus linear systems and their identification. Linear max-plus algebra has been(More)
We consider how relatively simple extensions of popular channel-aware schedulers can be used to multicast scalable video streams in high speed radio access networks. To support the evaluation, we first describe a model of the channel distortion of scalable video coding and validate it using eight commonly used test sequences. We use the distortion model in(More)
With the increasing acceptance of H.264/AVC as a video coding standard for mobile multimedia, it becomes very important to control the extreme burstiness of the traffic generated by the H.264/AVC encoder. Statistical multiplexing of video streams can be used to reduce the bit rate variations. In practice, the number of video streams that can be multiplexed(More)
—In this submission, emerging research challenges of smart toy networking are identified and discussed. We present a ToyBridge middleware platform that was developed to integrate physical-world smart toys with online activities, and a Visible Light Communications ToyTalk platform we developed for simple toy communications. Videos of ToyBridge and ToyTalk(More)