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Multicast services need to satisfy all mobile devices even under very bad channel conditions. However, the method for accommodating this will result in the throughput of the service being determined and limited by the channel state of the mobile device with the worst channel conditions. In this way, the capacity of mobile devices under a good channel state is determined based on the capacity of the...
This paper proposes an adaptive channel access (ACA) mechanism for LTE-U and WiFi coexistence in an unlicensed spectrum. To support the ACA mechanism, we introduce a new time-frequency structure, and a modified listen before talk (MLBT) functionality for channel contention of LTE-U users. Moreover, we also introduce a dynamic channel switch (DCS) sub-mechanism and an adaptive almost blank subframe...
The evolutionary trends of the Information Society have lead to the definition of the so-called Smart City, an environment characterized by the interaction of several heterogeneous technologies aiming at providing unprecedented services and efficiency. The Smart City is one of the most challenging scenarios for the Internet of Things (IoT) applicability. Among several things composing a Smart City,...
Ensuring fair co-existence between unlicensed LTE and WiFi networks is currently of major concern to both cellular operators and WiFi providers. Two main unlicensed LTE approaches currently being discussed, namely Carrier Sense Adaptive Transmission (CSAT) and Listen Before Talk (LBT). While these mechanisms differ in their compatibility with existing LTE specifications and regulatory compliance in...
Follow me cloud (FMC) is one of the solutions to the limitations of the service quality and type of functionality due to the inherent constraints of mobility management. In this paper, we address the tradeoff between the overhead and Quality of Experience (QoE) by proposing a mobility-based services migration prediction (MSMP). The aim of MSMP is to plan, for a given service, the sequence of data...
In this paper, we focus on the issue of maximizing the data collected by a mobile sink with unlimited energy which traverses a given straight path in an energy harvesting wireless sensor network (EH-WSN). Sensors are assumed to harvest energy periodically from the solar resources in their surrounding. Due to limitations on energy replenished within different time intervals, the sensors can reduce...
To increase the throughput and performance of the next-generation wireless cellular network, this paper proposes two clustering algorithms for integrated cellular and ad hoc relaying systems. In this system, we consider that all the available users are divided into two groups: One is the super group which locates in the cell central region, and another is the regular group which locates in the cell...
The development of Network Function Virtualization (NFV) and Software Defined Networks (SDN) standards is an opportunity for Mobile Network Operators (MNOs) to deploy Content Delivery Network (CDN) functionalities into the mobile network edge, such as Base Stations (BSs). In this paper, we investigated the content placement problem for the BS-based wireless CDN system. We call the storage resources...
In this paper, we address the relay selection problem in the cooperative energy harvesting (EH) network where the optimal mobile terminal will be selected as the relay if it can obtain expected profits. We model the utility as the power difference between the collected energy by using the time switching (TS) EH technique and the consumed energy by relaying signals. This relay selection problem is...
Deployment of portable access points (APs) in disaster affected areas has been heralded by many contemporary researchers as a key technique to formulate disaster recovery networks. However, existing research works do not effectively address one of its key problems, i.e., the low capacity of the backbone network (constructed by the APs) which is unable to satisfy the high user demands emanating from...
In this paper, the concept of moving small cells in mobile networks is presented and evaluated taking into account the dynamics of the system. We consider a small cell moving according to a Manhattan mobility model which is the case when the small cell is deployed on the top of a bus following a predefined trajectory in areas which are generally crowded. Taking into account the distribution of user...
Nowadays, LTE is widely used mobile communication technology. The development of mobile communications has never been faster. The main goal of mobile communications is to increase the data throughput and to ensure the best possible quality of communication between users, regardless of environment in which they are situated and type of data they share. In this paper, performance evaluation of different...
In this paper, we provide a comprehensive analysis of the multi-antenna transmission in a K-tier downlink heterogeneous cellular network (HCN). We first propose a reliability-oriented mobile access policy with an access threshold, in which each user connects to the strongest base station in terms of the truncated long-term received power. Under this policy, we derive for a random user explicit analytical...
With the explosive growth of mobile data demand, small cells densely deployed underlying the homogeneous macro-cells are emerging as a promising candidate for the fifth generation (5G) mobile network. The backhaul communication for small cells poses a significant challenge, and with huge bandwidth available in the mmWave band, the wireless backhaul at mmWave frequencies can be a promising backhaul...
This paper investigates the aspects of nanoscale information transmission based on ligand-receptor interactions in nanonetworks-based mobile molecular communication. Accordingly, the molecular communication means enables nanomachines to interconnect with another nanomachine in the nanonetwork. Analogous to intercellular communication, the communication in the proposed nanonetwork is performed by collision...
Pushing and caching hold the promise of significantly increasing the throughput of content-centric wireless networks. However, the throughput gain of these techniques is limited by the buffer size of the receiver. To overcome this, this paper presents a Joint Pushing and Caching (JPC) method that jointly determines the contents to be pushed to, and to be removed from, the receiver buffer in each timeslot...
In 4G and beyond 4G cellular communication systems, multi-hop relay network (MHR) plays a vital role. Improper deployment of relay station (RS) in MHR network creates some severe issues. The conventional studies on RS deployment have not considered the practical issue of link overloading. In this paper, a two-phase, fuzzy based selection and deployment scheme for RSs is proposed by considering link...
Instant messenger, often shortened to IM is one type of communication service that allows person to have a conversation (chat) privately with others via the internet. Within the calls & messaging on Android and iOS operating systems, they both have an equal value in the terms of innovation and performance. In this work, we focus on evaluate the performance of the IM application on Android and...
Due to proliferation of mobile devices, the demand for video in cellular networks has increased exorbitantly. However, cellular networks have limited resources and the wireless medium is time-varying in nature. This necessitates the video streaming protocols to be re-designed taking into account the overall quality of experience (QoE) of the end users. In this paper, we propose a metric called enhanced-time...
We present Janus, a system that adaptively selects and optimizes TCP implementations using existing off-the-shelf TCP versions based on observed network conditions and application requirements. We outline the theoretical motivations that drive the proposed selection algorithms in Janus, and demonstrate the benefits of our approach in an emulated network.
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