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Due to increasing demand for reconfigurability in embedded systems, real-time task scheduling is challenged by non-negligible reconfiguration overheads. We introduce the problem of real-time task scheduling under reconfiguration overhead on heterogeneous reconfigurable systems while considering the data dependencies and data communication overhead. We introduce a novel graph representation which captures...
Taking into account the fact that uneven video streams, instability of the network bandwidth , it's difficult to match the transmission bandwidth and video bit rate in video delivery procedure. Based on the SIP / SDP protocol, this paper presents an adaptive video streaming transmission control algorithm, customs a RTP / RTCP control strategy. Considering the current network status, receiver-side...
Owing to its potential to satisfy all outstanding requests for the same data item with a single response, on-demand data broadcast becomes a widely accepted approach to dynamic and scalable wireless information dissemination. In some emerging applications, such as road traffic navigation system, users prefer to request multiple dependent data items at a time. In addition, requests usually have deadline...
The pay-as-you-go economic model of cloud computing leads naturally to an earn-as-you-go profit model for many cloud based services. These applications can benefit from low level analyses for cost optimization and verification. Testing cloud applications to ensure they meet monetary cost objectives has not been well explored in the current literature. We present a static analysis approach for determining...
Nowadays, real-time applications expect the supporting computing system to be reconfigured at run-time. Even during such reconfiguration, timing requirements of the applications must be met. By extension, such requirements are relevant in the design of resource reservations techniques. In this work, we consider such a reconfiguration of the reservation provided by a constant bandwidth server (CBS)...
As the maximum of viewpoint in each optical-plate unit attached with the mobile phone is fixed, when the bandwidth of wireless network is insufficient, the data of videos with the maximum viewpoints will not be transferred perfectly. The multi-view adaptive display method on optical-plate stereo mobile phone can increase or decrease the multi-view stereo videos according to the network bandwidth,...
The paper designs the system of real-time streaming media transmission based on multiple 3G-card in the mobile environment especially for news workers to report news events quickly and duly. The paper introduces the system framework including 3 big modules: capturing and transportation subsystem, multiple 3G cards controlling subsystem and media receiving subsystem. Among them transmission and 3G...
ECG signals received from a long distance call through mobile phone network need to be displayed instantaneously, smoothly and recorded. Due to non-uniform load and inherent time delay in the network the real-time display is incoherent. This will cause some discomfort or inaccuracies in observing the waveform at the critical moment, and then more or less affect the quality of work performed by the...
This paper addresses the design of networks-on-chips for use in multi-processor systems-on-chips - the hardware platforms used in embedded systems. These platforms typically have to guarantee real-time properties, and as the network is a shared resource, it has to provide service guarantees (bandwidth and/or latency) to different communication flows. The paper reviews some past work in this field...
Recently, Peer-to-Peer (P2P) based multi-party video conference systems have been widely deployed. However, those solutions suffer from high cost when multiple users simultaneously distribute video streams to receivers. Most existing systems only support up to a dozen of users at the same time. In this paper, we propose a novel approach to construct and manage a heterogeneous P2P network for scalable...
In this paper, we consider several control loops sharing a common computation or communication resource. We assume the presence of a scheduler that approximates a fluid flow temporal partitioning of the resource among the different tasks. The goal of this paper is to expose the relation between the amount of resources allocated to each loop (Quality of Service) and the Quality of Control resulting...
Ethernet switches are increasingly used in real-time distributed systems as a technical solution to guarantee the timeliness in communications. However, there are still limitations related to real-time behavior caused by the limited number of priority levels and the possibility of memory overruns with consequent message losses. These limitations can be eliminated using a master/slave technique such...
Fully automated agricultural field treatments and Precise Farming are coming in shortly; yet increasing production needs demand a more efficient, planned and harmonized interaction between the machinery clusters involved in the work session. Soon a strong, effective and integrated standardization will be more than needed. This is the path the ISO standardization working group ISO TC-127/SC19/WG5 has...
A novel blocks placement strategy is developed for solving some shortages in recent Hadoop. With the Strategy, the optimal Data nodes, according to the real-time situation of Data nodes, are chosen dynamically to achieve load balancing. Finally, the simulation experiments indicate that our strategy behaves much better than the HDFS blocks placement when the situation is coherent to time.
We present a co-designed scheduling framework and platform architecture that together support compositional scheduling of real-time systems. The architecture is built on the Xen virtualization platform, and relies on compositional scheduling theory that uses periodic resource models as component interfaces. We implement resource models as periodic servers and consider enhancements to periodic server...
The efficient realization of self-organizing systems based on 2D stencil code applications, like our developed Marching Pixel algorithms, is a great challenge. They are data-intensive and also computational-intensive, because often a high number of iterations is required. FPGAs are predestined for the realization of these algorithms. They are very flexible, allow a scalable parallel processing and...
The current trend to move from homogeneous to heterogeneous multi-core systems promises further performance and energy-efficiency benefits. A typical future heterogeneous multi-core system includes two distinct types of cores, such as high performance sophisticated (``large'') cores and simple low-power (``small'') cores. In those heterogeneous platforms, execution phases of application threads that...
A central objective in designing LTE networks was to provide a better quality of experience for the end user. One of the implemented enhancements is a direct connection between neighbouring eNodeBs through the X2 interface. This interface enables mobility management and the transfer of the user's data in case of a handover. The aim of this paper is to provide an analytical model to dimension the X...
Selection of a Dynamic Routing Protocol has great impact on the utilization of various network resources. The factors like usage of bandwidth and behaviour towards growing entries in the routing table, determine the suitability of a protocol. In this paper, we have measured and compared the bandwidths utilised by the three IPv4 dynamic routing protocols, RIPv2 (Routing Information Protocol), EIGRP...
Ethernet is a popular technology for industrial networking thanks to its low cost and high bandwidth. The current proposals to achieve real-time communication over Ethernet do not consider the determinism of the control applications resulting in inefficient use of bandwidth resources. We proposed a protocol stack architecture that works with standard Ethernet to address this problem. This paper describes...
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