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Today's data center topologies mostly comprise multi-rooted trees with many equal-cost paths between the (source, destination) node pairs. Equal Cost Multi-Path (ECMP) forwarding is extensively used to leverage the multipath diversity in data center networks. However, ECMP forwarding might reduce the overall throughput significantly because of the random hash collision between multiple large flows...
Minimizing the flow completion times (FCTs), especially for the short flows, is widely deemed an important optimization goal in designing data center networks, while flow scheduling strategies play great role in achieving this target. Existing optimal scheduling algorithms severely depend on the prior knowledge of flow size, which is hard to implement in practice. Therefore, it is necessary to estimate...
We propose two high spectral efficient relaying protocols with low overhead including: the priority based relay selection (PRS), and the priority based relay selection with incremental transmission (PRSIT). In PRS and PRSIT, relay selection and scheduling are integrated to achieve full diversity order and high spectral efficiency. We define the overhead per allocated time slot for a user as the number...
Cognitive Radio (CR) is a next-generation wireless communication system that enables unlicensed users to exploit underutilized licensed spectrum to optimize the utilization of the overall radio spectrum. A Distributed Cognitive Radio Network (DCRN) is a distributed wireless network established by a number of unlicensed users in the absence of fixed network infrastructure such as a base station. Context...
The following topics are dealt with: parallel processing; distributed processing; operating systems; middleware; scheduling; load balancing; computer networks; multiprocessing systems; mobile computing; pervasive computing; software development; Web services; wireless networks; data security; and cloud computing.
In this paper we present a review of the new concepts of resource categories, motivated by practical situations, which have appeared in the project scheduling theory over the last decade. A basic resource classification from the point of view of resource constraints, divisibility, and preemptibility is presented. A new category of multi-site resources is introduced, and a multi-more resource-constrained...
The paper deals with the following topics:industrial systems; production scheduling; system-on-chips; computer networks; wireless sensor networks; embedded systems; and formal verification.
We seek to provide an analytical answer whether the impact of the selection of link scheduling algorithms diminishes on long network paths. The answer is provided through a detailed multi-node delay analysis, which is applicable to a broad class of scheduling algorithms, and which can account for statistical multiplexing. The analysis is enabled by two contributions: (1) We derive a function that...
The message scheduling is an important mechanism in the context of Networked Control Systems. The message scheduling is, in several networks, mainly based on static priorities associated to the messages (for example the network CAN). This static priority scheme has intrinsic limitations and so here we will consider scheduling strategies based on hybrid priorities. Three hybrid priority schemes, resulting...
Parallel and distributed systems have intended to exploit local and remote multi-cores and multiprocessors for high performance. However, without popular single-image distributed operating systems, few systems can utilize all resources automatically and effectively. This paper proposed an MPI-like middleware, Pitcher, to distribute multithreaded parallel workloads across networked computers without...
This paper presents the system architecture designed by the ICT FP7 OPTIMIX project to enable enhanced multimedia streaming in a point to multi-point context on wireless heterogeneous systems. The peculiarity of the OPTIMIX system is the introduction of new control blocks, i.e., controllers and observer, to efficiently handle the optimization of the multimedia transmissions. The controllers, by collecting...
The multimedia enriched transport supported by the Internet today continues to pose a challenge to engineers who attempt to provide QoS for its users. The popular method of using Diffserv solutions is typically too static to meet the mixed user traffic model. This paper introduces a novel user-centric approach of dynamically evaluating and policing incoming Internet flows to control the ratio of traffic...
The existing opportunistic protocols of delay tolerant network (DTN) occupy much storage and the prediction-based protocols need to calculate and spread much predication information and the scheduling protocols cannot accommodate to huge complex network. This paper analyses and summarizes the existing DTN protocols and proposes a new DTN routing protocol called CRHC which is based on hierarchical...
Data broadcast is an efficient way to disseminate information to large numbers of users in mobile environments. Existing research on scheduling of multi-item broadcasting mostly consider access frequency or the relationships among data items, these scheduling algorithms only achieve local optimum. In this paper, we introduce the A* algorithm of artificial intelligence, considering both access frequency...
For the emerging concept of network virtualization where a multitude of virtual networks (VNs) coexist, the main challenge is to isolate and control the resources allocated for individual virtual networks. Realizing such resource allocation requires deliberate design of the router enhanced specifically for handling a large number of virtual network flows. This paper discusses fundamental challenges...
We investigate the scaling law of throughput capacity of hybrid networks with non-trivial node mobility. By non-trivial mobility, we mean it is strong enough to improve capacity. A general model with heterogeneous nodes and spatial inhomogeneities is adopted. We show in a network, whose physical extension grows at f(n), with n users and k base stations, the per-node capacity is ??(1/f(n)) + ??(k/n)...
Running time sensitive multimedia services such as voice-over-IP (VoIP) and video-on-demand (VoD) on all-ip networks may have lower quality, i.e. Quality of Service (QoS), than its counterpart on conventional circuit-switched networks. We could enhance overall QoS without investing more resources if routers could forward packets based on their timeliness and QoS class giving important late packets...
A smart adaptive antenna has multiple Degrees of Freedom (DOFs), which can be used for intended communications and interference suppression. In this paper, we study routing and scheduling in wireless backhaul networks with smart antennas. In a wireless backhaul network, a spanning tree rooted at the gateway node is usually constructed for routing. We formally define the Interference aware Tree Construction...
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