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Cognitive communication networks, or simply cognitive networks (CNs), are one of the enabling technologies for next generation networks. Through dynamic spectrum access, CNs can make the best out of the underutilized radio spectrum resource. However, security threats can severely affect spectrum utilization in those networks. For instance, jamming can disrupt CN communications if not addressed properly...
Currently, the number of resources within a vehicle is growing. The vehicle can provide its idle resources to other vehicles through a cloud. Thus, these vehicles can communicate with each other to dynamically create a vehicular cloud. Therefore, this vehicular cloud needs to adapt according to the number of available resources that the vehicle members in the cloud are sharing. In this kind of cloud,...
In this paper we propose a novel online caching method to perform the update phase in a distributed caching system, with a natural application to heterogeneous scenarios with cache-equipped small-cell base stations. We investigate the performance of our scheme, showing in particular that it results in a significant reduction of backhaul load, to the point of converging to the performance of the optimal...
With ability to eliminate the cliff effect and achieve graceful degradation, analog-like transmission such as SoftCast has become a hot research issue for robust image/video delivery over wireless channels. However, it has not been well studied in the case of bandwidth compression, which usually occurs in bandwidth-constrained wireless environments such as satellite communication scenarios. In this...
In the mobile industrial human machine interaction (HMI) based on wireless sensor networks, the engineer has to manually select the target machine from a long list which may lead to wrong connection and waste of time. We observe that the engineer should face to the machine during the interaction to ensure that the machine works accurately, and this characteristic makes the proximity estimation algorithm...
In this paper, we investigate cooperative caching for spectrum access in cognitive radio networks. By cooperative caching, we mean that the unlicensed secondary base station (SBS) can cache certain primary contents to serve primary users, in exchange for the opportunities to access the licensed spectrum. We consider the joint optimization of caching and scheduling of the SBS to maximize the weighted...
Software-defined networking and mobile edge caching are promising technologies in next generation mobile networks. This paper proposes to jointly optimize bandwidth provisioning and caching strategies in software-defined mobile networks considering the quality of services and limitations of resources. The proposed scheme aims at maximizing gains from dynamically managing caches and efficiently utilizing...
Edge Cloud infrastructure will play a key role in extending the range of supported real-time cloud applications, by guaranteeing extremely fast response times. However, user mobility requires fast relocation of service instances, which represents an open challenge for resource-constrained cloudlets interconnected by high-latency and low-bandwidth links. In this paper, we investigate container-based...
We present MAP, a contention-free MAC protocol for fast and reliable multi-hop data dissemination in vehicular ad hoc networks which takes advantage of two-packet collisions to improve network capacity. MAP addresses both the problem of unwanted collisions due to hidden nodes in CSMA/CA-based networks, and the problem of excessive control messages in dense TDMA-based vehicular networks. MAP operation...
Inter-frequency scan (IFS) is a process performed by the user equipment (UE) to discover small cells in heterogeneous networks (HetNets) for high data rate and boosting the spectral efficiency. It is anticipated that the role of IFS will have a significant impact on the quality of service (QoS) and the energy efficiency in the future cellular systems. In this paper, a framework is presented to model...
Wireless networks can be categorized into infrastructure and infrastructure-less based on the network formation and architecture. Mobile Ad-hoc Networks are infrastructure-less networks with self-configuring property having a dynamic topology where nodes are free to move in any direction, due to this topological changes there are increased chances of link breaks in the network giving rise to path...
The paper presents issues related to the cooperative transmission in wireless vehicular networks. Cooperative transmission involves the use of mobile terminals as relay stations to improve the transmission quality, improve network performance and reduce energy consumption. The paper presents the methods used to implement cooperative transmission and the types of cooperative networks.
In this paper, we discuss a new model for context-aware computing in 5G networks in the context of emergency services. Our intention is to present a new model for mobile services (mobile web applications) that effectively harnesses the power of 5G networks. The true power of 5G networks is to enable applications that were previously not possible. In our model, we create a mirror (duplicate copy) for...
Nowadays, smart meters play a primordial role in the Smart Grid (SG) in order to optimize electricity production, distribution as well as consumption. By exchanging more frequent information between the smart meter and Utility Provider (UP), SG will operate more efficiently with less loss. However, this frequent exchange poses a serious privacy issue which can invade individual privacy since the UP...
Directional Antennas (DAs) provide higher gain, and reduce interference by directing beams toward the desired receiver. In this paper, we propose a new joint optimization framework considering the energy consumption and throughput in DAs Wireless Mesh Networks (WMNs). We formulate the joint optimization problem as a Mixed Integer Linear Problem (MILP) using a weighted objective function of both the...
Heterogeneous cellular network has become an important network architecture to improve network spectral efficiency. This paper works on a theoretical framework for analyzing outage probability and spectral efficiency in a two-tier heterogeneous network with joint processing cooperation. The heterogeneous network consists of high power nodes (HPNs) and low power nodes (LPNs). A range expansion association...
As a promising solution to offload cellular traffic, device-to-device (D2D) communication has been adopted to help disseminate contents. In this paper, the D2D offloading utility is maximized by proposing an optimal content pushing strategy based on the user interests and sharing willingness. Specifically, users are classified into groups by their interest probabilities and carry out D2D communications...
Ultra dense networks and device-to-device communications are expected to play a major role in 5G networks to meet tremendous traffic requirements. In our work, we address traffic offloading in dense device-to-device cooperative heterogeneous networks with focus on use cases where a very large number of users request simultaneously common streaming content from a remote server with quality of service...
This paper investigates a dynamic bandwidth allocation strategy with secrecy constraints, where big data can be viewed as a resource instead of a burden from the traditional perspective. Unlike usual cases, we take into account big data and security issues along with bandwidth allocation. It is reasonable to assume that big data derived from mobile network, by a series of processing, can generate...
Several applications involving the utilization of Small Unmanned Aerial Vehicles (SUAVs) require stationary and long-term coverage of a target area. Unfortunately, this goal is hard to achieve due the need for coordination and the limited flight autonomy of the SUAVs. In this paper, we investigate how to guarantee persistent coverage of a target area through SUAVs by exploiting characteristics of...
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