The recent witnessed evolution of cellular networks from a carefully planned deployment to more irregular, heterogeneous deployments Macro, Pico and Femto-BSs motivates new analysis design approaches. In this paper, we analyze the coverage probability in assuming repulsive point processes for base station deployment. particular, characterize, analytically using stochastic geometry, downlink under Matern hardcore process ensure minimum distance between randomly located stations. Assuming...

Coded caching can improve fundamental limits of communication, utilizing storage memory at individual users. This paper considers a centralized coded system, introducing heterogeneous cache sizes the users, i.e., users' memories are different size. The goal is to design placement and delivery policies that minimize worst-case load on server. To end, proposes an optimization framework for schemes which explicitly accounts heterogeneity sizes. We also characterize optimal scheme, case where...

This paper considers a cache-aided device-to-device (D2D) system where the users are equipped with cache memories of different size. During low traffic hours, server places content in users' memories, knowing that files requested by during peak hours will have to be delivered D2D transmissions only. The worst-case delivery load is minimized jointly designing uncoded placement and linear coded delivery. Next, novel lower bound on proposed used explicitly characterizing minimum (MD2DDL) for...

In cache-aided networks, the server populates cache memories at users during low-traffic periods in order to reduce delivery load peak-traffic hours. turn, there exists a fundamental tradeoff between on and sizes users. this paper, we study multicast network, where is connected with unequal number of less than or equal library files. We propose centralized uncoded placement linear schemes which are optimized by solving program. Additionally, derive lower bound memory that accounts for...

This paper considers a device-to-device (D2D) coded caching system where the users have differing cache sizes. During low traffic hours, server places subsets of files at users' memories, in manner that enables serving requests via D2D transmissions during peak hours. The objective is to jointly design contents and order minimize delivery load. In particular, we seek identify optimal uncoded placement linear schemes. We propose novel lower bound on load under placement, which us explicitly...

This paper considers centralized coded caching, where the server not only designs users' cache contents, but also assigns their sizes under a total memory budget. The is connected to each user via link of given finite capacity. For capacities and budget, we minimize worst-case delivery completion time by jointly optimizing sizes, placement schemes. optimal allocation caching scheme are characterized explicitly for case budget smaller than that library. Numerical results confirm savings in...

Energy harvesting (EH) is a promising technology for realizing energy-efficient wireless networks. In this paper, we utilize the ambient RF energy, particularly interference from neighboring transmissions, to replenish batteries of EH enabled nodes. However, energy imposes new challenges into analysis Our objective in paper investigate performance slotted Aloha random access network consisting two types nodes, namely Type I, which has unlimited supply and II, solely powered by an circuit....

In this work, we consider a cache-aided network where the users share end-caches. particular, user has access to only one of caches and number is less than users. We propose coded placement scheme that exploits asymmetry in associated with each cache. Some signals sent overloaded facilitate decoding subfiles stored at underloaded caches. present an explicit caching fully characterize gain for two-cache systems. Then, generalize our larger networks, optimal parameters are characterized by...

This paper considers heterogeneous coded caching where the users have unequal distortion requirements. The server is connected to via an error-free multicast link and designs users' cache sizes subject a total memory budget. In particular, in placement phase, jointly contents. To serve requests, delivery transmits signals that satisfy An optimization problem with objective of minimizing worst-case load budget requirements formulated. optimal solution for uncoded linear characterized...

Inter-cell Interference can be seen as a huge challenge towards meeting the high capacity and coverage targets, envisioned in 5G era. To this end, factors like expected density of access nodes reusing same spectrum, diverse sources interference from heterogeneous technologies, flexible wireless backhauling consideration multiple services with different KPIs have strong impact on way management is handled. This paper discusses three key drivers, good candidates for service-tailored...

In this work, we study coded placement in caching systems where the users have unequal cache sizes and demonstrate its performance advantage. particular, propose a scheme with for three-user that outperforms best uncoded placement. our proposed scheme, both pieces of files, at large memories are decoded using unicast/multicast signals intended to serve smaller memories. Furthermore, extend larger show reduction delivery load compared

We consider a distributed storage system where data nodes are equipped with energy harvesting transmitters. In particular, F files stored over n using regenerating codes. The main operations of the serving file requests collectors and repairing content that fail or leave system. Each operation has an associated expenditure. Under intermittent arrival profile, we study problem maximizing number retrieved given deadline. Additionally, minimizing repair time failed node. Both optimization...

Background Breast lesions including breast cancer represent a major public health issue in Sudan. Fine‐needle aspiration cytology (FNAC) is an established, simple, highly accurate, minimally invasive, and cost‐effective method of diagnosing most lesions. The aim this study to document the common conditions diagnosed by means FNAC over two‐year period Atbara, city north Methods A retrospective, descriptive, cross‐sectional, laboratory‐based which records all palpable years 2012 2013 were...

This paper considers a cache-aided network where the users have access to helper-caches with heterogeneous sizes. First, coded placement schemes are proposed that exploit heterogeneity in cache sizes when one user is connected each cache. In scheme, unicast/multicast signals intended serve small memories utilized decoding contents of larger memories. A reduction delivery load shown compared uncoded for three-user systems arbitrary and total memory regime. Next, equal-size caches multiple...

This paper presents the design foundations of an agile resource management (RM) framework for fifth generation (5G) radio access network (RAN) by describing essential building blocks (BBs). Overall, presented RM provides holistic solutions that consider and exploit novel aspects 5G systems, such as, diverse service requirements, co-existence multiple air interface (AI) variants (AIVs) in overall AI, dynamic topologies, communication modes. The proposed encompasses following key BBs: Advanced...

In this paper, we investigate the performance of an ALOHA random access wireless network consisting nodes with and without RF energy harvesting capability. We develop analyze a Markov model for system when capability are infinitely backlogged. Our results indicate that throughput is improved conventional underloaded. On contrary, all types have finite backlogs, numerically demonstrate delay overall overloaded. show there exists trade-off between efficiency delay, determine optimal number in...

Background: Placenta praevia is a source of drastic pregnancy, fetal and neonatal complications. There was variable incidence in the literature different parts world within same country regions. We carried out this study to find impact our area possible risk factors for serious obstetric problem.Methods: This cross-sectional descriptive, one-year retrospective prospective study, from April 2014 2016. All pregnant women attended antenatal care clinic Najran University Hospital during period,...

Energy harvesting (EH) is a promising technology for realizing energy efficient wireless networks. In this paper, we utilize the ambient RF energy, particularly interference from neighboring transmissions, to replenish batteries of EH enabled nodes. However, imposes new challenges into analysis Our objective in work investigate performance slotted Aloha random access network consisting two types nodes, namely Type I which has unlimited supply and II solely powered by an circuit. The...

In this work, we study energy cooperation in a two-user Gaussian multiple access channel (MAC), where the transmitters and receiver are powered by harvesters. particular, consumes harvested decoding received data bidirectional is allowed between any two nodes order to facilitate transmission decoding. Our objective maximize number of decoded bits at receiver, assuming offline knowledge state information (CSI) harvesting profiles. We first show that original problem can be decomposed into an...