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In a wireless body area networks (WBAN) with integrated sensor hubs, the proposed MAC protocol is a TDMA-based schedule used in active superframe interleaving and beacon shifting defined by the IEEE 802.15.6 standard. It considers the human dynamics and traffic information to meet the different QoS requirements of each sensor, improve bandwidth utilization and reduces packet collisions within networks...
With the categories of mobile communication services increasing, the positioning technology based on the base station (BS) in long term evolution (LTE) attracts more and more attention. When it comes to realize the indoor positioning of mobile phone, it is relatively difficult due to multipath, pedestrian interference, power attenuation and so on. In this paper, we use the sounding reference signal...
A new high-gain cylindrical dielectric resonator antenna (DRA) with a large bandwidth is proposed. A cylindrical dielectric resonator (DR), a double-annular patch and a metallic cylinder are used to obtain a large bandwidth and a high gain. The mode TM12 excited in the patch is used to enhance the gain of the DRA, and the cavity formed by the metallic cylinder provides a further higher gain and a...
Distributed interactive applications (DIAs) such as online gaming have attracted a vast number of users over the Internet. It is however known that the deployment of DIA systems comes with peculiar hardware/software requirements on the users' consoles. Recently, such industrial pioneers as Gaikai, Onlive and Ciinow have offered a new based distributed interactive applications generation of cloud (CDIAs),...
Existing research on cloud network (in)stability has primarily focused on communications between Virtual Machines (VMs) inside a cloud, leaving that of VM communications over higher-latency wide-area networks largely unexplored. Through measurement in real-world cloud platforms, we find that there are prevalent and significant degradation and variation for such VM communications with both TCP and...
We propose a Strip-oriented Asynchronous Prefetching (SoAP) for the parallel disk systems. This technique splits a prefetching request into multiple independent prefetching sub-requests, each of which contains a full data strip to exploit the maximum physical sequentiality of involved disks. In addition, SoAP associates each prefetching sub-request with a relative large time window, allowing every...
Live media streaming has become one of the most popular applications over the Internet. We have witnessed the successful deployment of commercial systems with CDN- or peer-to-peer based engines. While each being effective in certain aspects, having an all-round scalable, reliable, responsive and cost-effective solution remains an illusive goal. Moreover, today's live streaming services have become...
In application-level DDoS attacks, attackers mimic legitimate client behavior by sending proper-looking requests via bots. The previous DDoS solutions focus on bandwidth flooding attacks, and have encountered significant difficulty in deployment. This paper presents a deployable architecture that counts the application-level DDoS attacks against Web servers by combining overlay and IP anycast. In...
IEEE 802.16 standard is proposed for providing high data rate and middle-range access to Internet through wireless access channel. The increasing of data rate, access range, and total number of wireless nodes makes the wireless media access control more difficult and critical. Our objective is to provide a fair and efficient allocation to all the users to satisfy their quality of service. In this...
This paper presents a systematic in-depth study on the existence, importance, and application of stable nodes in peer- to-peer live video streaming. Using traces from a real large-scale system as well as analytical models, we show that, while the number of stable nodes is small throughout a whole session, their longer lifespans make them constitute a significant portion in a per-snapshot view of a...
The self-consistent nonlinear equations for beam-wave interaction and the equations of electronic are built up for Gyro-TWT in wave-guide with helical corrugation, numerical calculations of the equations above have been performed. The simulation results show: Among the center frequency 9.5 GHz, when the gain falls to 3dB the corresponding bandwidth is 19%.
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