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Freshness of information is of critical importance for a host of applications of wireless communications. In order to deliver information from multiple sources in a timely and fair fashion through a wireless channel, we propose optimizing the link scheduling strategy in respect of age of information, which is a newly introduced metric that measures how fresh information is. Specifically, we consider...
Ultra-dense network is considered a promising solution for high network capacity. It is favored for its scalability and cost effectiveness. However, when a user equipment (UE) is in a long discontinuous reception cycle and at high speeds, it may suffer from poor mobility performance and high power consumption. While handover algorithms have been widely studied, the impact of mobility measurements...
Driven by new types of wireless devices and the proliferation of bandwidth-intensive applications, data traffic and the corresponding network load are increasing dramatically. Network densification has been recognized as a promising and efficient way to provide higher network capacity and enhanced coverage. Most prior work on performance analysis of ultra-dense networks (UDNs) has focused on random...
The Advanced Metering Infrastructure (AMI) is a key component of the Smart Grid architecture. The Neighborhood Area Network (NAN) is the portion of the AMI that enables two-way communication between electric, gas and water meters and City Utilities. Many companies are currently deploying wireless NAN architectures based on the IEEE 802.15.4g technology while the Routing Protocol for Low-Power and...
Fog computing based radio access network is a promising paradigm for the fifth generation wireless communication system to provide high spectral and energy efficiency. With the help of the new designed fog computing based access points (F-APs), the user-centric objectives can be achieved through the adaptive technique and will relieve the load of fronthaul and alleviate the burden of base band unit...
In modern symmetrical chip multiprocessor (CMP) architecture, problems in cache coherence, context switch overheads and serialized code bottleneck are major causes of excessive computing power dissipation in the application of simultaneous multithreading (SMT) technique. This research models and manages above-mentioned problems based on user application usage patterns identified in a mobile computing...
This paper presents a high-level overview of the Fundamental Limits studies for the DARPA SSPARC program. It focuses on the key techniques and insights that have resulted from this effort and presents possible future research directions that have been suggested by these studies1.
In this paper, we study the performance of Dynamic Point Selection (DPS) Cooperative Multipoint (CoMP) techniques in heterogeneous networks (Hetnets). We show that to obtain good performance with spectral efficiency (SE) based DPS, the transmission point (TP) switching metric should be based on weighted average of the Almost Blank Subframes (ABS) and non-ABS SE values, where the weights are the fraction...
In this paper we study the association performance of a small cell base station (SBS) when mobile users (MUs) are randomly located around the said SBS according to a homogeneous Poisson point process. In the analysis, we consider noise only, interference-plus-noise, and interference-limited systems. For each case of association metric, a closed form expression for the outage probability of a randomly...
Virtual Network Embedding (VNE) is a key step towards network virtualization. In this paper, we first introduce a new link interference metric for each link to quantify the interference caused by its bandwidth scarcity to accept VN requests, and then an Interference-based VNE (I-VNE) algorithm is proposed. Benefited from the new metric, I-VNE can jointly consider the temporal and spatial topology...
Network-Assisted Interference Cancellation and Suppression (NAICS) receivers have appeared as a promising way to curb inter-cell interference in future dense network deployments. This investigation compares the performance of a NAICS receiver with successive interference cancellation capabilities, known as Symbol-Level Interference Cancellation (SLIC), with respect to a baseline Minimum Mean Square...
In a cognitive radio system the failure of secondary user (SU) transceivers to promptly vacate the channel can introduce significant access-latency for primary or high-priority users (PU). In conventional cognitive radio systems, the backoff latency is exacerbated by frame structures that only allow sensing at periodic intervals. Concurrent transmission and sensing using self-interference suppression...
This paper proposes a rank-constrained beamforming design for multiple-input multiple-output (MIMO) cognitive radio(CR) network where single primary user (PU) coexists with multiple secondary users (SUs). The optimal beamforming is designed to minimize the total interference leakage of the cognitive links while aligning the CR interferences to the PU receiver(PU-Rx) into a reduced-dimensional subspace...
Adjacent channel interference (ACI) is often not considered when spectrum sharing schemes are designed for cognitive radio networks (CRNs). In practice, it is necessary to avoid interference by deploying guard bands between two distinct receptions. However, using guard bands typically reduces spectrum efficiency. In this work, we study the impact of guard bands on spectrum efficiency under different...
High channel load in vehicle-to-vehicle communication leads to a degradation of the vehicles’ communication range, due to interference and hence packet loss at larger distances. Packet loss results from two or more concurrent transmissions, colliding at receivers located in-between, which is also known as the hidden station problem. In previous works, our simulation study has shown that this packet...
In this paper, dual-layer multi-user multiple-input multiple-output systems are studied. Building on the low-complexity layered orthogonal lattice detector (LC-LORD), an efficient sub-optimal joint modulation classification (MC) of the co-scheduled user and data detection receiver is developed. By adjusting the Max-Log-Maximum-a-Posteriori MC approach to the limitations of LC-LORD, and expanding it...
We propose a cross layer design that optimizes the energy efficiency of spectrum sharing systems. The energy per good bit (EPG) is considered as an energy efficiency metric. We optimize the secondary user's transmission power and media access frame length to minimize the EPG metric. We protect the primary user transmission via an outage probability constraint. The non-convex targeted problem is optimized...
An analytical approach is developed to evaluate the performance of a hybrid base station (BS) location model which considers the location regularity of macro BSs and topological randomness of small BSs, where the coverage probability and spectral efficiency are derived and verified by simulation. When both tiers have the same BS intensity, the tier of tessellated macro BSs achieves a 50% advantage...
The system administrator, faces an arduous task of figuring out whether to consolidate storage workloads, which workloads to isolate, which workloads to co-locate, and how to reduce the interference on co-located workloads? This paper presents an approach to ease this arduous task. We consider different mixes of enterprise storage applications on a high-end SSD to study their performance, system throughput...
Industrial WiFi network planning for a very large industrial hall is performed and results are compared for two planning approaches, namely an experimental site survey and a software-based automated planning. A software-automated process and a site survey yield comparable results. Reliable results can be obtained using an automated network planner with much less effort than when executing a time-consuming...
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