Mobile Tv

Television have converged the technologies of movies and radio and now being converged with mobile phones. Mobile TV is the result of the convergence between mobile devices and television. Mobile TV is a key device and service that enrich civilization with applications, vast market and great investment. Mobile TV is an important subject that has a potential impact on leading edge technologies for promising future. In the time being Mobile TV is still in its early stages and has many potential; therefore some applications such as mobile advertising and learning are discussed in this paper. When it comes to advertising, Mobile TV presents a new opportunity different from the traditional TV advertisements producing an interactive type of advertisements, enabling user engagement. While in the case of mobile learning, mobile devices open up new chances for absorbing knowledge and most recent information without forgetting the practical experience aspect.

This contribution introduces a new transmission scheme for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The new scheme is efficient and suitable especially for symmetric channels such as the link between two base stations or between two antennas on radio beam transmission. The principle is based on the estimation of channel parameters of a pilot data send by the receiver to the transmitter. Then, the transmitter codes the transmitted signal using the estimated channel parameters to adapt the signal to the channel variations. Conducted Monte-Carlo simulation results show that the proposed scheme has better performance, in terms of bandwidth efficiency and complexity, compared to the conventional MIMO-OFDM scheme methods in the case of a symmetric channel.

H.264 Scalable Video Coding (SVC) is an extension to the Advanced Video Coding (AVC) H.264 standard which provides efficient scalability functionalities on top of the high coding efficiency of H.264/AVC. SVC allows for temporal, spatial, and quality scalability of the output video stream, encoding the video information into an H.264/AVC base layer and a series of enhancement layers which incrementally improve the quality, increase screen resolution and/or frame rate. SVC is particularly suited for mobile TV reception, since the received video quality is adaptable to variable reception conditions and heterogeneous receiver capabilities. However, mobile TV Digital Video Broadcasting (DVB) standards such as DVB-H and DVB-SH were designed prior to the introduction of SVC, and therefore the underlying transmission protocols are not optimized for scalable video delivery. In this overview paper, we review recently proposed solutions for SVC stream adaptation on the underlying DVB-H/SH protocols, and point out novel technical solutions that are currently under consideration for the next generation mobile broadcasting standard DVB-NGH.

Storage networking technology has enjoyed strong growth in recent years, but security concerns and threats facing networked data have grown equally fast. Today, there are many potential threats that are targeted at storage networks, including data modification, destruction and theft, DoS attacks, malware, hardware theft and unauthorized access, among others. In order for a Storage Area Network (SAN) to be secure, each of these threats must be individually addressed. In this paper, we present a comparative study by implementing different security methods in IP Storage network.

This paper presents the results from three lab-based studies that investigated different ways of delivering Mobile TV News by measuring user responses to different encoding bitrates, image resolutions and text quality. All studies were carried out with participants watching News content on mobile devices, with a total of 216 participants rating the acceptability of the viewing experience. Study 1 compared the acceptability of a 15-second video clip at different video and audio encoding bit rates on a 3G phone at a resolution of 176x144 and an iPAQ PDA (240x180). Study 2 measured the acceptability of video quality of full feature news clips of 2.5 minutes which were recorded from broadcast TV, encoded at resolutions ranging from 120x90 to 240x180, and combined with different encoding bit rates and audio qualities presented on an iPAQ. Study 3 improved the legibility of the text included in the video simulating a separate text delivery. The acceptability of News' video quality was greatly reduced at a resolution of 120x90. The legibility of text was a decisive factor in the participants' assessment of the video quality. Resolutions of 168x126 and higher were substantially more acceptable when they were accompanied by optimized high quality text compared to proportionally scaled inline text. When accompanied by high quality text TV news clips were acceptable to the vast majority of participants at resolutions as small as 168x126 for video encoding bitrates of 160kbps and higher. Service designers and operators can apply this knowledge to design a cost-effective mobile TV experience.

With the rapid increase of new and diverse cellular mobile services, the overlapping of cells has become typical in the majority of the coverage area of the network. Vertical handovers occur between two layers of cells when a user is switched from one layer to the other. In this paper we investigate the influence of network parameters on vertical hard handover performance in a cell environment. The work considers two layers of cells: a layer of macrocells and a layer of microcells. Handover requests enter the macrocell from neighbor macrocells and from microcells that belong to a different layer. Using Markov chain analysis and simulation we calculate network performance parameters such as mean queue delay, handover dropping probability and channel utilization. We also compare the handover performance for the macrocell and macrocell traffic separately. Our results show the influence of total channels, maximum queue size and handover request arrival rate on handover performance. They also show that when the traffic from each layer is treated with equal priority in the system, the performance of each layer is comparable.

This chapter provides an overview of the key factors that influence the Quality of Experience (QoE) of mobile TV services. It compiles the current knowledgefrom,empirical studies and recommendations,on four key requirements,for the uptake of mobile TV services: handset usability and its acceptance by the user, the technical performance and reliability of the

Whereas most of the studies and papers present mobile television as a personal mobile TV with isolated niche usage, mostly in mobile situations, our findings show that half of the usage is non-mobile and about 20% is shared with a family member, a friend or a colleague. Moreover, it is incorporated in routine social activities such as work and family life. Indeed, the content viewed depends on the other activities and other content accessed previously, read or seen on home TV, radio, MP3 devices or newspapers. On his way to work, the user will watch the news if he hasn't already done so, otherwise he will select a musical mobile TV channel. We found that working class participants view different content on mobile TV and on their home TV, as they focus on music, sport and news on mobile TV, a content which can easily fragmented to suit short or long viewing duration. Thus mobile TV is complementary to other devices and media. Finally, each usage is a new challenge to the user&#x...

Abstract. TV has often been regarded primarily as a traditional family medium [8], because it is mainly watched at home and used as a basis for interaction with others. Now that the mobile phone, which people seem to experience as a personal communication device, has developed functionalities peculiar to mass media, including a TV feature, it is interesting to know how these functionalities will be used throughout the day and in different everyday life contexts. Will mobile TV used mostly on the go or as an additional media at home? Will it become as a highly individualized media format or will the watching experience typically be shared with others? This paper examines the users ’ mobile TV choices in different everyday life contexts. The data is based on ongoing empirical research in Finland in 2006. The tested mobile TV services included both news and entertainment contents, and were tested in 3G and DVB-H networks.

As the network convergence with services for both static and mobile networks has been the principal object of the next generation networks, the recent research focus is converging in the direction of standardizing common infrastructure based on all-IP networks. IMS is a recent initiative. Moreover, designing and deploying a standard QoS provisioning mechanisms in large networks is not a trivial matter. IPTV services are considered between the important IMS flow, the actual QoS management mechanisms proposed by 3GPP allow providing the IMS network components control and efficient service delivery, however the 3GPP approach focuses entirely on the step of providing the service, but there is no mechanism for monitoring Qos dynamically. This paper discusses the issues, design and analysis related to on demand dynamic QoS control in these next generation networks and fuss both Quality of Service (QoS) information signaling and IPTV traffic engineering options that may serve as key components of IPTV service specific QoS policies, which are designed to accommodate with customer requirements and resource availability by using the eTOM process to monitor the Qos values and to propose optimal solution to provide the quality of delivered content. The eTOM process interact with implemented marking entities which execute an algorithm to marking IPTV packets, this cooperation must improve the quality of service of the IPTV traffic.

Studies on intention to use, adopting the technology acceptance model (TAM), have been reported but their extended models do not provide a good explanation of the determinants of intention to use 3G mobile TV. The present study develops and examines a more comprehensive technology acceptance model by introducing new typical constructs and identifying their role in promoting the behavioral intention to use 3G mobile TV service. The results show that constructs such as normative pressure, price level, perceived availability, and perceived quality are meaningful extensions of TAM, since they were found to be strong determinants in predicting the behavioral intention to use a 3G mobile TV service in Indonesia.

... In the past few years, wireless mesh network (WMN) has drawn significant attention from research commu-nity and industry as a fast, easy ... a station might have to wait for an arbitrarily long time to send a packet, and multimedia services may suffer intolerable delay and jitter. ...