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The effects of the coexistence of different wireless access technologies in the same area are not very easy to be evaluated and analysed. If these different networks interact with each other and form a heterogeneous wireless network, the analysis becomes even more difficult. Different approaches are possible: to build a pilot heterogeneous network (but, if new technologies or, at least, existing technologies...
In this paper we analyze the vertical handover latency for real time service VoIP G.711 using IEEE 802.21 standard during the vertical handover process between WiMAX and WLAN. We make comparison between MIPv6 and PMIPv6 protocols for different MN velocity and conclude that PMIPv6 reduces the vertical handover latency, so we obtain better VoIP performances during vertical handovers between WiMAX and...
Deployment of Broadband Internet is currently one of the most important global issues. Plans for developing agendas are very ambitious but implementation is not as expected. In this paper authors analyse broadband growth and its limitation factors, delays and gaps. Using logistic growth function, the growth limit, delay and gap for Serbia is calculated in reference to the average of EU countries....
This paper describes a method to emulate a MIH network i.e. to evaluate the real-life behaviour of a MIH network without the need for still not commercially available MIH equipments. The paper focuses on network-wide performance evaluation in the context of a WiFi-WiMAX vertical handover. The EXata Network Emulation tool is used to emulate the MIH network.
Nowadays the number of the services delivered to the mobile users grows rapidly. The guaranty of high quality level for each one service becomes even more complex. This requires new approaches for evaluating the quality parameters (provider centric) from one side and the customer satisfaction (customer centric) from the other side. The paper proposes an approach for the customer satisfaction, where...
Ad hoc networks are characterized by multihop wireless connectivity, frequently changing network topology and the need for efficient dynamic routing protocols plays an important role. In these networks there is no fixed topology due to the mobility of nodes, interference, multipath propagation and path loss. Hence a dynamic routing protocol is needed for these networks to function properly. Many of...
MUSIC based, joint estimation of synchronization parameters (Direction of Arrival — DoA, Time Offset — TO and Carrier Frequency Offset — CFO) on uplink of Mobile WiMAX system based on IEEE 802.16e standard is considered.
In this paper is introduced the Orbcomm space segment as a wide area packet switched and global two-way data transfer network providing satellite communication, tracking, monitoring and logistics services between mobile, remote, semi fixed or fixed Subscriber Communication Units (SCU) in Mobile Satellite Service (MSS) and Gateway Earth Stations (GES) or Gateway Control Centres (GCC) accomplished via...
This paper describes in particular Space Division Multiple Access (SDMA) applicable in Mobile Satellite Communications (MSC). In satellite communication systems, as a rule, especially in Mobile Satellite Communications (MSC) many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users, however, can be solved by using Multiple...
In this paper are introduced Low-Gain Omnidirectional Antennas for Mobile Satellite Communications (MSC) and Navigation. In many respects the Mobile Satellite Antenna (MSA) infrastructures currently available for MSC and Navigation. Medium and high gain MSA need to track the satellite, following both movements of mobiles and satellite orbital motions. Sometimes this is difficult and expensive to synchronize...
In this paper design aspects of application layer protocol for mobile telemetry are studied. The main design requirements include access independency and low power consumption. The protocol is on the top of Internet Protocol and has a layered structure. It provides mechanism for reliable message transfer using the transaction concept. The core protocol functions are domain specific and they are described...
The paper presents preliminary results of a European project, with the goal to design an integrated system for delivering real-time travel and traffic information on mobile navigation devices. The service matches together multiple data formats and operates via a Common Agreed Interface (CAI) to achieve data fusion from different information sources. The updated information is used to create specific...
This paper presents an overview of the spectrum management aspects underlying the transition of terrestrial television broadcasting from analog to digital and the allocation of the digital dividend, which is the spectrum made available by this transition.
The practical success of service platform technology for next-generation wireless multimedia relies largely on its flexibility in providing adaptive and cost effective services. This article aims to present an overview of existing work in the area, pointing out key research issues and possible solutions for successful implementation a well engineered next-generation services to be created, deployed...
Rapid changes in the sector of electronic communications, especially the development of new technologies and convergence of telecommunications, media and information technologies call for constant changes and adjustments of the legal framework regulating this sector. One of the prime tasks of the electronic communications sector regulation in the Republic of Serbia is the process of market analysis...
This paper presents the S-Commerce Framework (SC-F) that weaves social elements into mobile commerce. The SC-F consists of three blocks referring to consumers, providers, and brokers, and ensures their connection through different relationships that are then mapped onto social networks. Examples of relationships include competition, referral, and loyalty. This paper, also, discusses the Smart Mobile...
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