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In the next decades, hundreds of autonomous ships (AS) and Conventional ships (CS) will cross the Detroit of Gibraltar. For their autonomous operation, and remote control, these ships need to communicate with each other, with the vessel traffic system (VTS), with the port state control (PSC) and with the shore control centre (SCC). For a sustainable maritime industry, the biggest challenge will be...
The problem of managing the scarce radio spectrum resource is addressed in this paper; based upon the Worldwide Interoperability for Microwave Access (WiMAX) network. Emerging and innovative techniques such as spectrum virtualization and network federation are adopted to enable the sharing of spectrum amongst mobile operators. A novel entity known as the Virtual Spectrum Hypervisor (VS-Hypervisor)...
Based on the features and limitations of maritime communication in the associated areas, this paper focuses on the key technology of wide-band communication network at sea under E-navigation framework. New methods and strategies to realize wide-band communication as well as some issues to be tackled for ensuring its development had been addressed. Especially, the WiMAX (Worldwide Interoperability...
Nowadays, the mobile phone base stations are situated everywhere due to huge increment in mobile phone usage around the world. However, these mobile base stations have increased the radio frequency exposure level creating issue of health symptoms as the scientific studies has investigated. So a triple band stop frequency selective surface has been proposed with single sided FR-4 substrate inbuilt...
Power conservation mechanisms allow the operator to meet the QoS requirements of its customers while offering mobility service for longer duration. Therefore, it is essential to maximize the battery life of WiMAX equipments. In this paper, we study the mechanisms of power conservation already proposed for the WiMAX network. We then propose an improved mechanism for energy conservation in the IEEE802...
In the age of high speed communication. The demand for data speed, high downloading and fast internet increases day by day. Believable applications in the endurance of high speed communication, mobile web access, gaming services, IP telephony, high definition mobile TV, video Conference, 3D TV and Cloud Computing so, 3G Systems, Wimax, Wi-Fi are the technologies which are used and looking forward...
Demand for broadband wireless access is rising as the need for user mobility and data access at all times increases. WiMAX also called IEEE 802.16 provides various Quality of Service (QoS) support at medium access control (MAC) layer to various classes of traffics such as audio, video, images and text. Scheduling plays an important role in providing QoS. IEEE 802.16 standard has not specified a standard...
In this paper, the transmission performance considering an error of channel state information (CSI) feedback for a downlink mobile WiMAX system with multiuser multiple-input multiple-output (MU-MIMO) systems in a computer simulation and field experiment are described. In computer simulation, a downlink MU-MIMO system can be realized by using the block diagonalization algorithm, and each user can receive...
The handover technology is one of the most important technologies for the quality of real-time operation in mobile Internet. However, current IP-level mobility protocols have difficulties meeting the stringent handover delay requirements. In this paper, we propose an enhanced handover scheme in a heterogeneous mobile environment with the support of the Media Independent Handover (MIH) Services. The...
In the present day wireless communication networks, the main objective is to support different multimedia services with various requirements of Quality of Services and varying bandwidth requirements. The key role in effective resource management of WiMAX network is to enhance the performance of network. Gateway (GW) relocation of Access Service Network (ASN) includes changing the Anchor Point (AP)...
For Wireless networks with wide area connectivity; Mobile Wimax is highly growing as a prominent technology due to its potential of providing high-speed internet connectivity for long distance communication. Being a Broadband Wireless Technology, there are some security issues which need to be addressed. This paper gives security analysis of RSA and ECC in Mobile Wimax.
Electricity grid is one of the most critical national infrastructures. Therefore, governments around the world make the smart grid as one their priorities, in order to guarantee a safe, reliable and environment friendly energy. The smart grid can only be built on a two-way communication infrastructure, which in its turn must be safe, reliable and green as well. Wireless communications build an attractive...
The Network Management Center needs to be highly intelligent to control the network devices for Quality of Service (QoS) assurance. To make sure the traffic of the call and the data as well as the satisfaction from the customers, we develop a decision support (DS) mechanism for the 4G mobile networking with QoS awareness. In this study, real experimental results are explored from the WiMAX equipment...
The article describes and analyzes the situations of electromagnetic compatibility of WiMAX wireless technology and Wi-Fi. Experimentally authors obtained the optimal characteristics of receiving-transmitting equipment of two shared standards to meet the conditions of parameters compatibility in terms of electromagnetic compatibility and frequency-territorial planning for the safe and smooth operation...
In this paper, we propose a vertical handover decision algorithm. This algorithm executes the vertical handover based on several network criteria like the network delay, the available bandwidth, the received signal strength, etc. Fuzzy logic system was used to implement the handover initiation module while utility function was chosen for the network selection module. We compare our proposed algorithm...
Scalable video coding, together with adaptive modulation and coding, is a promising technique for providing real-time video multicast services on mobile stations (MSs) in heterogeneous channel conditions. On the other hand, since MSs are often powered by batteries, reducing the energy consumption of mobile devices is an important concern. In this paper, we study the problem of scalable video multicast...
The Handoff schemes should be seamless, only then can better service be provided. Hence for improved scheme we design a feasible handoff scheme for wireless heterogeneous networks. In the proposed handover method, a Vertical Handoff Manager (VHOM) is designed to control the handoff process based on the Markov Decision Process (MDP) in wide area network. In the proposed method STAs will choose the...
In heterogeneous Wireless communication network, transferring of data between moving nodes can be handled by well designed mobility management system, in which handover is a important factor in maintaining space connection to base station even in high speed. During handover (i.e. mobile node moving from one base station area to another base station area), there is a need to change initial point of...
During the last decade, wireless field has witnessed revolutionary technology developments. The need for high data rates to support various multimedia applications has increased many folds. 3G and 4G technologies like WiMax (Worldwide Interoperability for Microwave Access) and LTE (Long Term Evolution) etc. are providing solution for this requirement of high speed data and high bandwidth. This paper...
The IEEE 802.16e [Mobile Worldwide Interoperability for Microwave Access(MWiMAX)] standard supports the mobility of Subscriber Station (SS), thus making them Mobile Station (MS). This incurs one of the most challenging issues in IEEE 802.16e which is handover (HO). HO occurs whenever MS migrates from one cell to another. Reducing HO delay is significant to improve the Quality of Service (QoS). To...
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