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Cell sizes of the Fifth Generation (5G) of mobile networks grow inexorably smaller because of the massive Multiple-Input Multiple-Output (MIMO) and millimeter wave communication technologies to be used. It is therefore challenging to address the mobility management, especially vertical handover in 5G networks. In this paper, an intelligent vertical handover framework is proposed and discussed to simplify...
In this article, we introduce a new metric called ‘information centric coverage probability’ to characterize the performance of a two-tier cache enabled cellular network. The proposed metric unifies the dynamics of in-network caching and heterogeneous networking to provide a unified performance measure. Specifically, it quantifies the probability that a mobile user (MU) is covered at a desired rate...
To achieve higher spectral efficiency in future wireless networks, small cells have been conceived to be deployed over conventional macrocell networks, generating heterogeneous networks (HetNets). However, interference between different tiers of HetNets is the main bottleneck for high spectral efficiency. Spectrum access, including spectrum deployment and channel access, is one of the most powerful...
This paper develops a model evaluating the impact of mobility in heterogeneous wireless networks by the way of analytical expressions of the spatio-temporal evolution of QoS indicators. Such formulas are obtained by introducing a multiuser averaged mobility pattern named density of users. Among the set of densities, we use a Gaussian form of this quantity, which results from a modeling method based...
In this paper, we introduce new solutions to handle real-time video traffic, such as video conferencing, in the future software-defined radio access networks. The real-time video is well-known for its high peak-to-mean rate ratio. This is a major challenge for traffic engineering and radio resource allocation, especially in small cell radio networks. We first propose an online method to dynamically...
Ambient Assisted Living (AAL) describes an ICT based environment that exposes personalized and context-aware intelligent services, thus creating an appropriate experience to the end user to support independent living and improvement of the everyday quality of life of both healthy elderly and disabled people. The social and economic impact of AAL systems have boosted the research activities that combined...
This paper investigates a joint spectrum scheduling and power allocation problem in Cognitive Radio (CR) network composed of several secondary (SU) and primary users (PU). The objective is to minimize the overall SU system power consumption (over several orthogonal frequency bands) under minimum Quality of Service (QoS) constraints, maximum peak and average interference to the PUs constraints. The...
This paper investigates the Tomlinson-Harashima precoding (THP) design for secure communications in broadcast multiple-input multiple-output (MIMO) systems in the presence of a passive eavesdropper. We focus on optimizing the nonlinear transceiver to guarantee a certain Quality-of-Service (QoS) level for the intended receiver in terms of mean-squared-error (MSE). The scheme allocates the transmit...
This paper studies the resource allocation for multi-D2D (Device-to-Device) communications in heterogeneous networks with quality-of-service (QoS) guarantees for both cellular and D2D links. To improve the achievable rate of D2D communication and the spectrum utilization, one D2D pair is allowed to reuse multiple cellular spectrum resources. However, this scheme introduces more interference so that...
Device-to-device (D2D) communication, where user equipments (UEs) in proximity communicate directly with each other, is an alternative technology for densification in future wireless communications featuring extremely dense and heterogeneous networks. The intrinsic characteristics of D2D communication include (1) limited energy capacity of battery powered UEs, (2) necessary power consumption to maintain...
In this paper, we define a collision area in a heterogeneous cellular network for the purpose of interference management between Device-to-Device (D2D) and conventional cellular (CC) communications. Currently, most D2D routing algorithms assume synchronized accurate location knowledge among users and the base stations. In reality, this level of location accuracy is difficult and power consuming in...
In this paper, a power optimization strategy is studied in underlay Device-to-Device (D2D) communication coexisted heterogeneous wireless networks with relay-assisted. In order to reduce the power consumption of cellular users (CUs), especially those far away from the base station (BS), we introduce the relay node (RN) to help transport its data to BS with less power consumption. By taking the advantage...
Aiming at efficient utilizing the licensed spectrum, in this paper, we develop an interference cancellation based transmission strategy (ICTS) for the cooperative cognitive radio networks (CRN) which will take advantage of the opportunities that arise during the primary automatic repeat requests (ARQ) and cancel the primary interference in both the primary initial transmission and retransmission slots...
In the Wavelength Division Multiplexing (WDM) based optical circuit switching network, it takes longer time to set up the intermediate optical cross-connecting devices on the route. Thus, pre-computed routing approaches are desirable to instantly set up the connection. Most of their research works are based on the K Shortest Path (KSP) algorithm or it's variants considering route disjointness, because...
Today's data centers host wide variety of applications which generate diverse mix of internal data center traffic. In a data center environment 90% of the traffic flows, though they constitute only 10% of the data carried around, are short flows with sizes up to a maximum of 1MB. The rest 10% constitute long flows with sizes in the range of 1MB to 1GB. Throughput matters for the long flows whereas...
Consumer acceptance is of great interest in the adoption of novel multimedia products and services. A number of factors can greatly influence the customer experience during a video session, impacting the acceptability of the product or service. Factors such as the Technical Quality (TQ) which covers the technical aspects of the signal quality can be controlled from the network provider. On the other...
Quality of Experience (QoE) has emerged as the key performance metric to evaluate end-user service quality perception. We propose a system for video and web QoE assessment in LTE networks that we call QoE Analytics system. We build the proposed system and run it on a LTE network and successfully estimates QoE metrics per UE in real-time by inspecting user plane data on S1 interface without any QoE...
The interactivity in multimedia services concerns the input/output process of the user with the system, as well as its cooperativity. It is an important element that affects the overall Quality of Experience (QoE), which may even mask the impact of the quality level of the (audio and visual) signal itself on the overall user perception. This work is a preliminary study aimed at evaluating the weight...
In the video streaming arena, and especially within the wireless transmission domain, measuring users' quality of experience (QoE) has become a pressing issue for it offers several benefits to both the service provider and the end user. However, available measurement techniques that adopt a full reference model (FR) are impractical in real-time transmission scenarios since they require the original...
New display modalities in forthcoming media consumption scenarios require a realignment of currently employed Quality of Experience evaluation frameworks for these novel settings. We consider commercially available optical see-through devices, typically employed by operators in augmented vision or augmented reality scenarios. Based on current multimedia evaluation frameworks, we extrapolate onto the...
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