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Given the rapid change in processor architecture in the past years, there is a driving necessity to assess processor performance for a high performance computation workload. Assessing performance for a given workload is important to understand which architecture parameters the workload performance is sensitive to. A given workload can be categorized as memory bounded, compute bounded, or in between...
Cloud networking typically leads to scenarii where a large number of TCP connections share a common bottleneck link. In this paper, we focus on the case of TCP Cubic, which is the default TCP version in the Linux kernel. TCP Cubic is designed to better utilize high bandwidth-delay product path in an IP network. To do so, Cubic modifies the linear window growth function of legacy TCP standards, e.g...
In this paper, we propose a realistic analytical framework to evaluate the performance of concurrent channel change stream delivery techniques. Our analysis utilizes the results from the latest statistical research on user distributions and channel switching activities in IPTV networks to improve the accuracy of performance evaluations. We discuss in detail the proposed framework and examine the critical...
The limited scope of Internet architecture forced network providers implementing centralized mechanisms (QoS, group communication, mobility, etc) to support attractive value added sessions. Besides ease to manage, performance aspects of such mechanisms, mainly in terms of scalability, robustness and availability, are shortcoming. In this sense, decentralization is promising, since complex networking...
This paper analyzes the deficiency of the average queue calculation in tradition RED queue, and presents a calculation algorithm for the calculation of RED's average queue based on the current network conditions in order to enhance the self-adaptation of RED and we use NS2 for the simulation. Experimental results show that the improved RED performances better than tradition RED in the middle congestion...
The Flexray protocol is rapidly emerging as the next generation in-vehicle communication protocol that will accommodate safety critical, high bandwidth and real time requirements coming from the burgeoning increase of automotive electronic content. The Flexray protocol provides a globally synchronized time base and has provisions for a Time Division Multiple Access (TDMA) based transmit model (static...
This paper proposes TD-uCSMA a synchronous distributed coordination function which is meant to provide CSMA/CA with a mechanism for QoS provisioning and bandwidth management over WiFi networks. TD-uCSMA relies on synchronization among nodes and the time-driven switching of contention parameters inside nodes. The TD-uCSMA operating principles and preliminary synchronization issues are presented here...
Due to the limited number of orthogonal channels and the dense deployment of IEEE 802.11 access points (APs), interference between neighboring basic service sets (BSSs) are very common in indoor environment. One consequence of such neighboring interference is the inter-BSSs hidden terminal problem in which some mobile stations may suffer from throughput starvation. In this paper, we advocate and develop...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
We designed and built a novel all-optical re-timing, re-amplifying, and re-shaping (3R) regeneration system based on terahertz optical asymmetric demultiplexers (TOADs) developed in our laboratory. The system is capable of parallel processing multiple wavelengths, a feature which will significantly improve the scalability of current wavelength division multiplexing (WDM) networks. Performance against...
Video-streaming can now be offered on third-generation (3G) mobile networks. Most research efforts have focused on video download. This paper presents a detailed study of challenges faced for successfully deploying applications requiring life video upload. Both subjective and objective qualities as well as the effects of mobility are analyzed on real 3G networks. Consequently, video profiles are identified...
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