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The limited backhaul capacity has been considered as an important issue that influences the performance of traffic offloading in small-cell networks. We thus investigate how mobile users (MUs) efficiently offload traffic to different small cells with the new paradigm of dual-connectivity, subject to different backhaul capacities of small cells. Specifically, we formulate an optimization problem that...
Device-to-device (D2D) communication is a promising technique to enhance spectrum efficiency of the cellular systems by enabling direct transmissions between end users close to each other. However, the arising interference issue should be carefully addressed to obtain the potential spectrum efficiency gains. In this paper, we develop an approximate interior point method to maximize the sum throughput...
Caching popular contents in the storage of users is deemed as an efficient approach to increase energy efficiency, decrease latency, as well as offload backhauls. Due to the mobility feature of use terminals in the real environment, the analysis of successful transmission is particular important in mobile networks. In this paper, the position of cache-enabled users are distributed as a Homogeneous...
The ever-increasing demand for multimedia contents has imposed severe traffic overload pressure on mobile network operators (MNOs). Cooperative data offloading is a promising approach to alleviate the traffic congestion, which leverages the device-to-device (D2D) communications among mobile users. However, mobile users may not be obligated to participate in cooperative data offloading, since it will...
Device-to-Device (D2D) communication is a promising way to improve spectral, energy and latency performance in future wireless networks. This paper focuses on the network-controlled approach considering that overlay D2D communications are enabled in a multi-cell system, where legacy users coexist with potential D2D pairs. Two of the most critical problems in the D2D concept, mode selection and user...
The device-to-device (D2D) enabled cloud radio access network (C-RAN) is regarded as a promising network architecture with high spectral efficiency and low latency. Considering that the centralized optimization puts heavy burdens on the fronthaul and baseband unit pool, the mode selection and resource allocation problem aiming at maximizing the system throughput in uplink is modeled as a coalition...
Driven by the rapid development of wireless communication system, more and more vehicular services can be efficiently supported via vehicle-to-everything (V2X) communications. In order to allocate radio resource with the reasonable implementation complexity in dense urban intersection, a two-stage allocation algorithm is proposed in this paper, whose main objective is to minimize delay and ensure...
In this paper we propose an energy harvesting-based cooperative jamming and full-duplex relaying scheme to enhance the secrecy rate for wireless communication between a source node and a destination node, in the presence of an eavesdropper. To characterize the performance, we develop a mathematical analysis framework for instantaneous and average secrecy rates. We consider the practical interference...
Location-disclosure is a major privacy issue in vehicular social networks when people are interested in traffic-related cooperation drive, location-aware services, and other applications. In this paper, we propose a Social-aware Location-privacy Protection (SLP) method in vehicular social networks to protect location privacy. This method enables trustworthy users to obfuscate an original sender's...
Network slicing is an emerging area of research, featuring a logical arrangement of resources to operate as individual networks, thus allowing for massively customizable service and tenant requirements. The focus of this paper is to present the design of a flexible 5G architecture for network slicing, building on SDN and NFV technologies as enablers. More specifically, we place the emphasis on techniques...
In this paper, we develop and analyze a novel performance metric, called interference efficiency (IE), that shows the number of transmitted bits per unit of interference energy imposed on the primary users (PUs) in an underlay cognitive radio network (CRN). Specifically, we develop a framework to maximize the IE of a CRN with multiple secondary users (SUs) while satisfying target constraints on the...
The realization of a smart grid requires deployment of sensors or measurement devices (MDs) that generate data; this data is securely collected in a central controller or power operator (PO) for further processing. AsMDs are scattered over a large geographical area, they need help of relaying nodes or data concentrators (DCs) to forward their data to the PO. However, the DC nodes are third party devices...
A spatial transformation scheme is proposed to be deployed at the radio-units (RUs) in cloud radio-access-networks (C-RAN) to alleviate the fronthaul burden and baseband signal processing complexity. The module transforms antenna domain signals to the beam domain, such that the spatial dimensionality is significantly reduced for RUs with large antenna arrays. A low-complexity transformation scheme...
In this paper, we present a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) based backhaul link in the presence of hardware impairments, such as phase noise (PN), residual carrier frequency offset (RCFO), and sampling frequency offset (SFO). Focusing on these adverse hardware effects on the MIMO-OFDM system, we propose corresponding signal processing algorithms...
Ultra-reliable low-latency communications (URLLC) entail the transmission of sporadic and small packets, with low latency and very high reliability. Among many potential areas of optimization for URLLC, the problems of large delays during HARQ retransmissions, and inaccurate link adaptation as a consequence of the rapidly-varying interference conditions are studied. The former is addressed by reducing...
State-of-the-art LTE Turbo-Code decoder architectures support throughputs of several Gbps by employing parallelism on different architectural levels. However, a very high flexibility with respect to code block sizes and code rates must also be retained. Sophisticated techniques are used to maintain communications performance at high code rates which are critical. In this paper, we propose new techniques...
In conventional large-scale networks, creation and management of network services are costly and complex tasks that often consume a lot of resources, including time and manpower. Network softwarization and network function virtualization have been introduced to tackle these problems, aiming at decreasing costs and complexity of implementing new services, maintaining the implemented services, and managing...
LTE-based satellite systems in LEO constellations are a promising solution for extending broadband coverage to areas not connected to a terrestrial infrastructure. However, the large delays and Doppler shifts over the satellite channel pose severe technical challenges to a traditional LTE system. In this paper, two architectures are proposed for a LEO mega-constellation realizing a satellite-enabled...
In this paper, the problem of cross-layer design of the link scheduling and flow control is studied in hybrid terrestrial-satellite wireless backhauling network. Considering network limitations and requirements, the target is to minimize the traffic delivery time by deciding the active backhauling links that can transmit simultaneously. Additionally, the proposed scheme provides a way to utilize the...
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