IEEE Network

Distribuir contenido
TOC Alert for Publication# 65
Updated: hace 18 horas 30 mins

Front Cover

Vie, 09/22/2017 - 06:00
Presents the front cover for this issue of the publication.
Categorías: research

Cover 2

Vie, 09/22/2017 - 06:00
Advertisement, IEEE.
Categorías: research

Table of Contents

Vie, 09/22/2017 - 06:00
Presents the table of contents for this issue of the publication.
Categorías: research

Editor's Note

Vie, 09/22/2017 - 06:00
Presents the introductory editorial for this issue of the publication.
Categorías: research

ComSoc Membership

Vie, 09/22/2017 - 06:00
Advertisement, IEEE.
Categorías: research

Scanning the Literature

Vie, 09/22/2017 - 06:00
Presents concise summaries of selected papers that are recently published in the field of networking. Each summary describes the paper's main idea, methodology, and technical contributions. The purpose of the column is to bring the state of the art of networking research to readers of IEEE Network. Authors are also welcome to recommend their recently published work to the column, and papers with novel ideas, solid work, and significant contributions to the field are especially appreciated. Authors wishing to have their papers presented in the column should contact the editor.
Categorías: research

Guest Editorial

Vie, 09/22/2017 - 06:00
The articles in this special issue focus on ultra-dense heterogeneous small cell deployment in 5G communications. Among enabling technologies for 5G communication systems and beyond, we are witnessing the explosive growth of ultra-dense heterogeneous deployment of small cells including micro eNBs, pico eNBs, femto eNBs, and remote radio heads (RRHs), driven by the stringent requirements of the fifth generation (5G) such as the increasing data rate, spectrum efficiency, and energy efficiency. The nature of an ultra-dense network, however, poses new challenges, not only in the deployment of massive base stations, but also in the frequent and complicated handovers, complex mobility management, QoE-ensured resource allocation, and inter-cell interference mitigation. These issues have to be carefully addressed to facilitate the successful deployment of ultra-dense heterogeneous networks. Toward this end, this Special Issue is devoted to presenting prominent research outcomes and the state-of-the-art advances in ultra-dense heterogeneous small cell deployment in emerging 5G and beyond.
Categorías: research

Resource Management in Non-Orthogonal Multiple Access Networks for 5G and Beyond

Vie, 09/22/2017 - 06:00
Non-orthogonal multiple access techniques have been proposed recently for 5G wireless systems and beyond to improve access efficiency by allowing many users to share the same spectrum. Due to the strong co-channel interference among mobile users introduced by NOMA, it poses significant challenges for system design and resource management. This article reviews resource management issues in NOMA systems. The main taxonomy of NOMA is presented by focusing on the two main categories of resource reuse: power-domain and code-domain NOMA. Then a novel radio resource management framework is proposed based on game-theoretic models for uplink and downlink transmissions. Finally, potential applications and open research directions in the area of resource management for NOMA are provided.
Categorías: research

Non-Orthogonal Multiple Access Vehicular Small Cell Networks: Architecture and Solution

Vie, 09/22/2017 - 06:00
Recently, the concept of 5G vehicular smallcell networking (V-SCN) has been proposed to meet the growing demand of mobile data services in vehicular communications. However, it is a great challenge to explore spectrum and energy efficiency due to the fast vehicle mobility and varying communication environment. In this article, we focus on critical issues, such as interference management and handover, when employing 5G V-SCNs. In order to solve these issues, the network architecture embedded with NOMA is deigned. Furthermore, we propose a hierarchical power control solution to perform the joint optimization of cell association and power control to improve the spectrum and energy efficiency in NOMA-enabled 5G V-SCNs. Numerical comparison results provide some guidelines for developing NOMA-enabled 5G V-SCNs in an economical and highly energy-efficient manner.
Categorías: research

Ultra-Dense Heterogeneous Relay Networks: A Non-Uniform Traffic Hotspot Case

Vie, 09/22/2017 - 06:00
Ultra-dense heterogeneous networks (UD-Het- Nets) with non-uniform traffic hotspots are important scenarios for future wireless networks, which, however, impose challenges on efficient framework and algorithm design due to the heavy congestion incurred by massive hotspot users. Considering these challenges, this article first develops a two-layer interference-aware heterogeneous relay network architecture that consists of macro base station networks and ultra-dense relay networks. Particularly, we develop an approach to formulate a QoE-aware optimization problem that enfolds connectivity and delay, both of which are crucial for hotspot users in our framework. Regarding this problem, we further devise a cost-efficient resource allocation algorithm that achieves almost the same performance as the optimal one.
Categorías: research

Video Delivery in Dense 5G Cellular Networks

Vie, 09/22/2017 - 06:00
One of the main challenges for mobile network operators today is the efficient delivery of mobile VoD services. In order to satisfy their requirements, we must revolutionize the way we manage the densely deployed resources in 5G wireless networks, and tailor their operation for video content delivery. Two key approaches that leverage the density of the 5G infrastructure are the systematic usage of in-network storage resources available in BSs for the deployment of smart caching policies, and the video delivery optimization techniques that leverage the novel multi-tier, dense, and heterogeneous structure of 5G systems. We first provide an overview of the main features of the densely deployed 5G networks that are expected to shape mobile VoD services. Next, we present specific solutions that have recently been proposed for each one of the approaches above, and discuss the main lessons learned. Finally, we discuss a number of open problems for video delivery in dense 5G systems.
Categorías: research

Cooperative Hierarchical Caching in 5G Cloud Radio Access Networks

Vie, 09/22/2017 - 06:00
Over the last few years, C-RAN is proposed as a transformative architecture for 5G cellular networks that brings the flexibility and agility of cloud computing to wireless communications. At the same time, content caching in wireless networks has become an essential solution to lower the content- access latency and backhaul traffic loading, leading to user QoE improvement and network cost reduction. In this article, a novel cooperative hierarchical caching (CHC) framework in C-RAN is introduced where contents are jointly cached at the BBU and at the RRHs. Unlike in traditional approaches, the cache at the BBU, cloud cache, presents a new layer in the cache hierarchy, bridging the latency/capacity gap between the traditional edge-based and core-based caching schemes. Trace-driven simulations reveal that CHC yields up to 51 percent improvement in cache hit ratio, 11 percent decrease in average content access latency, and 18 percent reduction in backhaul traffic load compared to the edge-only caching scheme with the same total cache capacity. Before closing the article, we discuss the key challenges and promising opportunities for deploying content caching in C-RAN in order to make it an enabler technology in 5G ultra-dense systems.
Categorías: research

Socially Motivated Data Caching in Ultra-Dense Small Cell Networks

Vie, 09/22/2017 - 06:00
UDN is considered as a promising technique to boost the network capacity by reducing the path loss between the base station and UE for the upcoming 5G mobile communication, while the backhaul capacity has become the bottleneck in huge data traffic generated by UEs. One effective approach to coping with the bottleneck is caching the content at the edge of UDNs. Taking advantage of D2D communication, not only SBSs but also UE can serve as cache nodes to help others for data access by sharing a channel to directly communicate with each other, thus tackling the bandwidth limitation of backhaul links. However, due to the selfish nature of mobile users in the network, incentive is needed for UEs to cache for others. In this article, the data caching incentive problem in UDNs is studied by exploring caching cost of SBS and social factors among UEs. A social group utility maximization (SGUM) game is exploited to motivate data caching among SBSs and UEs. Based on SGUM, a socially motivated caching approach is proposed. The evaluation of the proposed socially motivated caching approach is provided and compared to baseline caching schemes. The corresponding results and observations support the vision of a socially motivated caching paradigm for the future UDNs.
Categorías: research

Handover Management in Software-Defined Ultra-Dense 5G Networks

Vie, 09/22/2017 - 06:00
Ultra-densification is a key approach aimed at satisfying high data traffic in next-generation 5G networks. However, the high number of small cell eNB deployments in such ultra-dense networks (UDNs) may result in unnecessary, frequent, and back-and-forth handovers, with additional problems related to increased delay and total failure of the handoff process. Additionally, due to the separation of control and data signaling in 5G technology, the handover operation must be executed in both tiers. In this article, we propose an SDN-based mobility and available resource estimation strategy to solve the handover delay problem. Here, we estimate the neighbor eNB transition probabilities of the mobile node and their available resource probabilities by using a Markov chain formulation. This allows a mathematically elegant framework to select the optimal eNBs and then assign these to mobile nodes virtually, with all connections completed through the use of OpenFlow tables. Finally, we compare the conventional LTE and our proposed handover strategies by analyzing the observed delays according to the densification ratio parameter. Also, we analyze the handover failure ratios of both strategies according to the user number. Results reveal that the proposed strategy reduces the handover delay and failures by 52 and 21 percent compared to the conventional approach.
Categorías: research

UAV-Assisted Dynamic Coverage in a Heterogeneous Cellular System

Vie, 09/22/2017 - 06:00
The growing popularity of mobile Internet and massive MTC with special traffic characteristics and locations have imposed huge challenges to current cellular networks. Deploying new base stations, however, becomes difficult and expensive, especially for complicated urban scenarios and MTC traffic. The UAV-assisted heterogeneous cellular solution is proposed in this article. It utilizes UAV-based floating relay (FR) to deploy FR cells inside the macrocell, and thus achieves dynamic and adaptive coverage. Comprehensive analyses on FR cells' deployment including frequency reuse, interference, backhaul resource allocation, and coverage are given.
Categorías: research

Take Renewable Energy into CRAN toward Green Wireless Access Networks

Vie, 09/22/2017 - 06:00
Wireless networks have experienced fast development in the past decades. Various advanced wireless technologies have been proposed. To catch up with the ever increasing diverse communication needs, one main developing trend is on the network virtualization. CRAN is proposed to abstract the physical network resources to allow flexible and efficient resource use and sharing. It has been widely recognized that huge energy consumption has been raised due to the massive deployment of cellular networks. Lowering the network energy consumption, therefore, becomes a topic of great concern. In this article, we are motivated to propose a novel architecture, Re-CRAN, which integrates DER, DESD, and energy routers into CRAN and enables ingenious management of both network resource and energy resource. By a case study on the RRH management in a dense Re-CRAN, we prove the high energy efficiency benefit from our design.
Categorías: research

IEEE.tv

Vie, 09/22/2017 - 06:00
Advertisement, IEEE.
Categorías: research

Security-Aware and Privacy-Preserving D2D Communications in 5G

Vie, 09/22/2017 - 06:00
Device-to-device communication is a promising technology that can offload heavy traffic in 5G networks. However, due to its open nature, there are several security issues. The LTE-A standard introduces security and protection mechanisms, which include mutual authentication between the UEs and the eNB. Unfortunately, D2D communications still face various threats: jamming, data modification, free-riding, and privacy violation. In this article, we first give an architecture for an LTE-D2D system and its application scenarios with various security threats and requirements. Then we investigate privacy concerns in terms of location privacy, identity privacy, and data privacy. Afterward, we propose security solutions from aspects of application-layer security and physical-layer security, respectively. Further, we propose two frameworks for cross-application-physical-layer security methods. Finally, the challenges and future research directions are presented.
Categorías: research

Efficient and Reliable Multicast Using Device-to-Device Communication and Network Coding for a 5G Network

Vie, 09/22/2017 - 06:00
How to achieve efficient reliable multicast with 100 percent reliability is an important issue of emerging 5G network. In the 5G network, besides the macro BSs, ultra-dense low-power BSs (e.g., micro, pico, and femto eNBs) are deployed throughout the macrocell to form ultradense small cells, which reduces the number of associated multicast receivers per BS and consequently reduces the number of retransmissions per packet (i.e., traffic load) at each BS. However, this gain is greatly limited by the nodes with bad channel quality. Adopting D2D-communication-based retransmission can effectively reduce the retransmissions at the BSs. There are some challenging issues to be addressed, like the selection of appropriate D2D links, extremely reducing D2D retransmissions, and the design of an efficient acknowledgment mechanism. In this article, considering the ultra-dense small cell deployment in a 5G network, we propose an efficient reliable multicast scheme that jointly utilizes D2D communication and network coding to achieve 100 percent reliability. In addition to discussing research issues that deserve further study, we present numerical results to illustrate the performance gains achieved by applying the proposed scheme in terms of traffic load reduction at the BSs.
Categorías: research

IEEE Standards

Vie, 09/22/2017 - 06:00
Advertisement, IEEE.
Categorías: research