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Coflow scheduling without prior knowledge has been proposed recently. However, the previous solution, Aalo, has two problems: it does not explicitly control the flow rate; it assumes the network is ideally non-blocking (with perfect traffic balancing and no oversubscription). In this paper, we show the performance loss caused by the above two problems. We propose EAalo to cope with the problems. It...
MPEG Dynamic Adaptive Streaming over HTTP (DASH) has become the most used technology of video delivery nowadays. Considering the video segment more important than its location, new internet architecture such as Content Centric Network (CCN) is proposed to enhance DASH streaming. This architecture with its in-network caching salient feature improves Quality of Experience (QoE) from consumer side. It...
Nowadays, video streaming causes traffic over the Internet. Dynamic Adaptive video Streaming (DAS) has emerged as a promising solution. However, existing researches in DAS focus on single client instead of multi-client which is much closer to reality. Even if some methods are proposed for multi-client scenarios, they need to add coordinate proxy to the network or add additional function to routers...
The offers on cloud computing infrastructure have focused on providing computing and storage resources, and consider the network mostly as a required add-on and not truly as a resource itself. However, the need to have more robust solutions is becoming clearer. This paper argues that cloud infrastructure services will evolve and allow the definition of complete infrastructures that comprise both computing...
Single-source HTTP Adaptive Streaming protocols (HAS), such as MPEG-DASH, have become the de-facto solutions to deliver video over the Internet. By avoiding buffer stalling events that are mainly caused by the lack of throughput at client or at server side, HAS protocols increase end-user's Quality of Experience (QoE). We propose to extend HAS capabilities to a pragmatic DASH-compliant Multiple-Source...
Network services have been significantly increased in today's enterprise networks. The time and cost of deploying these services are recently considered as critical challenges for enterprise networks. Network Functions Virtualization (NFV) is a promising solution to offer cost-efficient, scalable and more rapid deployment of such services. It allows the implementation of fine-grained services as a...
Distributed file systems enable the reliable storage of exabytes of information on thousands of servers distributed throughout a network. These systems achieve reliability and performance by storing multiple copies of data blocks in different locations across the network. The management of these copies of data is commonly handled by intermediate servers that track and coordinate the placement of data...
ORAM scheme is becoming a study hotspot to access data securely, whether ORAM is based on layer or tree structure, client cache always exists in different ORAM. Some smart devices for example, ceil phone may be as a user with small capacity associated with cloud storage. The optimal client cache should be limited to small constant size or a strict small upper bound. The paper designs a novel client...
Service chaining composed of several different virtual network functions (VNFs) constitutes a use case of Network Functions Virtualization (NFV). In a conventional method, the optimal allocation of VNFs and logical paths was resolved by using integer linear programming. However, because the approach did not consider that the required resources of each service differ, the residual resources of the...
In flexible functional split, functions of a virtualized evolved NodeB (eNB) can be disaggregated in distributed computational resources. One of the main constraints for their placement is the latency experienced by the communication between the Virtual Machines (VM) hosting the functions. This paper evaluates experimentally the latency limits for different functional splits providing insights on...
Today, in the cloud computing context, the network is starting to arise as a true resource itself and not just as a required connectivity add-on. The ability to define network resources (e.g. routing/switching elements, bandwidth) in this context is still scarce, but there are clear evidences that this is a future reality. In this article, we consider that cloud infrastructure services will allow...
In this work we analyze the complex trade-off between data transfer, computation time, and power consumption when a multi-stage data-intensive algorithm (in this case video stabilization) is split between a low power mobile device and high power cloud server. We evaluate design choices in terms of which intermediate representations should be transferred to the server and back to the mobile device,...
In recent years, Dynamic Adaptive Streaming over HTTP (DASH) has gained momentum as an effective solution for delivering videos on the Internet. This trend is further driven by the deployment of existing HTTP cache infrastructures in DASH systems to reduce the traffic load as well as to serve clients better. However, deploying conventional cache servers in DASH systems still suffers from low cache...
The exponential growth of mobile videos has enabled a variety of video crowdsourcing applications. However, existing crowdsourcing approaches require all video files to be uploaded, wasting a large amount of bandwidth since not all crowdsourced videos are useful. Moreover, it is difficult for applications to find desired videos based on user-generated annotations, which can be inaccurate or miss important...
The proliferation of mobile devices and ubiquitous access of the wireless network enables many new mobile applications such as augmented reality, mobile gaming and so on. As the applications are latency sensitive, researchers propose to offload the complex computations of these applications to the nearby mobile edge cloud, in order to reduce the latency. Existing works mostly consider the problem...
In this paper, we propose a MTS-CFQ I/O scheduler that is implemented by modifying the existing Linux CFQ I/O scheduler. MTS-CFQ observes whether the user requested I/O bandwidth weight is well distributed. Based on the I/O bandwidth observation, we improved I/O performance of the existing bandwidth distribution ability by dynamically controlling the I/O time-slice of the virtual machine. The use...
Inter-domain link congestion can be caused by either under-provision or peer disputes. TSLP and M-Lab are two representative network-tomographic methods to detect congestion on inter-domain links. In this work, we propose a performancecost framework to evaluate and compare the two methods via a simulator built atop NS-3. Via detailed simulations, we obtained some insights on the two approaches and...
We develop an innovative PC2PC (personal computer to pervasive computing) system to enable the secure, robust and pervasive mobile workstyle. PC2PC server compresses the desktop screens of any virtualized system, and delivers the stream through any popular networks to PC2PC client remotely for stream decoding, rendering and end-user interaction (such as keyboard/mouse commands). We have implemented...
In order to integrate a large number of distributed energy resources in distribution grids a robust decentralized information and communication control structure is required. This paper proposes an overlay peer-to-peer (P2P) architecture for controlling and monitoring microgrids in real time, which has a great capacity of adaptation to the demanding network requirements of these environments. The...
This paper asks how much we can gain in terms of bandwidth and user satisfaction, if recommender systems became bandwidth aware and took into account not only the user preferences, but also the fact that they may need to serve these users under bandwidth constraints, as is the case over wireless networks. We formulate this as a new problem in the context of index coding: we relax the index coding...
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