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Providing LTE connectivity to emerging Machine-to-Machine (M2M) applications imposes several challenges to the operation and optimization of current and future 3GPP mobile broadband standard releases. Scheduling in an efficient way M2M traffic over the existing LTE MAC infrastructure is decisive for the smooth evolution towards an M2M-enabled LTE system. The large number of connecting devices compared...
Cognitive Radio Networks have been designed to increase spectrum utilization by utilizing temporarily unused spectrum bands in the primary user's licensed spectrum by secondary (unlicensed) users. In general, when a primary user appears in a band occupied by a secondary user, the secondary user will temporarily cease its transmission and change the operating channel. Unfortunately, successive spectrum...
Group communication plays an important role in the distribution of real-time data for IPTV, multimedia conferencing, or online multiplayer games, but IP multicast remains unsupported in today's global Internet. Hybrid solutions that bridge between overlay and underlay multicast are a promising escape from the deployment dilemma of multicast. In this paper, we examine the real-time capabilities of...
Network protocols can be designed to enable a reduction in energy use of data servers. We architect a new HTTP timed redirection response for a GET request to be redirected to another server with a given delay. This redirection response can be used in a hybrid web server to coalesce GET requests and allow a server to periodically sleep. In such a hybrid web server, a small low-power ARM-based Assistant...
Military tactical networks require reach back connectivity, and in most cases the only viable solution is a combination of satellite and radio links. This hybrid network is characterized by long delay, transmission errors and relative low capacity. Geostationary satellites add a substantial time delay. Terrestrial wireless packet networks might introduce comparable delays and jitter. Mobility and...
Nowadays Wireless Sensor Networks are increasingly accepted as a reliable solution to highly demanding and critical application scenarios such as military and medical environments, where security support is an absolute prerequisite. However, supporting security implies the execution of cipher algorithms posing significant overheads on WSN nodes, which suffer from scarce resource availability. Moreover,...
Supervisory control theory deals with automated synthesis of models of supervisory controllers that ensure safe and nonblocking behavior of the supervised system. Typically, (large) supervised systems cannot be guaranteed to meet elaborated performance requirements, as ensuring them during the synthesis procedure is a costly undertaking. We propose a model-based systems engineering framework that...
In this work, we are about to introduce a high performance NetFPGA based network measurement system, called Rnetprobe that implements a dual, multi-layer timestamping method for QoS analysis. The multi-layer timestamping idea came from the demand to perform end-to-end active measurements that enable improved cross-layer analysis to evaluate QoS for time sensitive services. Accordingly, for each captured...
As the number of processing elements which can be placed on a single chip doubles about every two years, both System-on-Chip (SoC) and the microprocessor market call for high-performance, flexible, scalable, and design-friendly interconnection network architectures [1]. Network-on-Chip (NoC) has been proposed as a solution to multi-core communication problems. The advantages of NoC include high bandwidth,...
Geographically distributed data centers for the rapid growth of worldwide cloud service bring the demand of massive inter-data center information exchange. Considering the capacity and costs, existing optical networks show their advantages to carry the non-interactive, delay tolerated and bulk inter-data center data. In order not to affect the real-time traffic, these bulk data is usually transferred...
In telecommunication services, alongside QoS, QoE provision has become essential, thus performance and quality evaluation measurement results need to reflect reality as much as possible. Our goal is to enhance QoE evaluation schemes and enable improved QoE provision for video applications and services anytime and anywhere. In order to eliminate potential erroneous conclusions of QoE assessment techniques,...
Machine Type Communication (MTC), which allows different devices to communicate without the needs of human to machine interactions, has been developed in recent years. However, MTC possibly resulting in an unexpectedly high collision rate is different from contemporary mobile communication service when it involves a very large number of communication terminals with little traffic requirement. As a...
In this paper we presented results of the performance evaluation of the WCDMA/HSPA radio access network when loaded with multiplayer real-time games and M2M applications traffic. Evaluation was done in a live network, on one Node B. Traffic, characteristic for the emerging Machine Type Communication and online multiplayer games, was generated by an application running on 10 mobile phones in parallel,...
In this paper, we described time synchronization performances with Precise Time Protocol (PTP). The synchronization experiments between a master clock and slave clocks were performed for two cases, that is, one with direct connection and the other with switches. From the experiments, the followings were observed. In the case of direct connection, actual and average offsets between the master and the...
Higher-Vth devices in the cross-coupled latches and the write access transistors, and lower-Vth devices in the read ports are preferred for reducing leakage current without sacrificing performance. However, at ultra-low supply voltage levels, higher-Vth devices can retard or nullify energy efficiency due to substantially slower write speed than read. This paper presents energy efficiency maximization...
Multipath routing has been proved effective in mobile ad-hoc networks (MANETs) for coping with link failures resulting from node mobility. In wireless mesh networks (WMNs) where routers are generally static, the traffic carried by the backup paths may adversely impact other flows and the multicast group itself, because these paths increase the number of transmissions and thus the level of interference...
A systematic method is proposed to address modeling challenges in accurate chip level leakage prediction, namely a precise total leakage width count method, a simple model to quantify leakage uplift caused by systematic across-chip variation, and a consistent model to capture 3-sigma leakage and leakage spread at fixed performance.
IEEE 802.15.4 is the first recognized standard that can replace the large number of proprietary PHY and MAC protocols for Low Rate Wireless Personal Area Networks (LR- WPANs). To balance the conflicting demands of low-delay data delivery and consumed energy, this standard employs CSMA-CA as the multiple-access scheme. However, a critical study of this protocol's operation under different conditions...
Increasing process variations result in increasing statistical diversity in manufactured devices. Test plans that are developed without this diversity in mind are bound to result in poor test quality/yield and/or long test times. Adaptive testing is a general term that is used to tailor the test strategy to accommodate a wide range of variation in the statistical characteristics of manufactured devices...
We propose an architecture of FL-net over Ethernet for a networked control system. FL-net over Ethernet is ease of broadcast which makes nodes exchange information easily and precisely. The proposed timed token passes among control units and determines which control unit has the data transmission right. Due to the token is unique in FL-net, only one control unit can send packets at time. This makes...
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