Multimedia telephony

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  • IMS – the IP Multimedia Subsystem of the 3GPP family of telecommunication standards – may very well be at the same time the worst and the best kept secret of the telecom world. “Secret” because it is essentially designed to be invisible – the modern version of the infrastructure that delivers communication to the world. “Worst kept” because it has dominated the strategies for communication evolution in the past years, and has thus been very visible, at least to those in the industry.

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  • We described earlier that the core IMS enables multimedia services and traditional telephony services. In this section we focus on the traditional telephony services that, in the context of the PSTN and ISDN, are globally known as PSTN/ISDN supplementary services. Traditional supplementary services are: Call Forwarding, Call Hold/Resume, Connected Line Identification Presentation/Restriction, etc.

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  • where A straight forward approach for BSS is to identify the unknown system first and then to apply the inverse of the identified system to the measurement signals in order to restore the signal sources. This approach can lead to problems of instability. Therefore it is desired that the demixing system be estimated based on the observations of mixed signals. The simplest case is the instantaneous mixing in which matrix is a constant matrix with all elements being scalar values.

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  • Two technologies that have profoundly impacted people on this planet recently are cellular telephony and the Internet. The former, with its tremendous advantages of tetherless and ubiquitous communication capabilities, was accepted worldwide. It met the expectations of a success story for wealthy nations. On the other hand, its reach into the developing and the not-so-prosperous parts of the world was even more profound.

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  • The mobile phone and portable device handset are currently undergoing a transformation caused by several different factors. For one, portable devices are getting more powerful and capable of performing tasks that would have been hard to imagine a few short years ago. Many of us carry a portable device that is capable of everything from using the World Wide Web to watching movies to playing 3D games--and it can even make phone calls! For another, consumers are becoming more savvy and demanding about what they want such a device to do....

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  • The merging of voice and data on a single network opens powerful new possibilities in communications. Only a fundamental understanding of both technologies will ensure you are equipped to maximise their full potential. Convergence Technologies for 3G Networks describes the evolution from cellular to a converged network that integrates traditional telecommunications and the technology of the Internet.

    pdf673p dieutan 17-05-2010 161 80   Download

  • The H.323 standard is a cornerstone technology for the transmission of real-time audio, video, and data communications over packet-based networks. It specifies the components, protocols, and procedures providing multimedia communication over packet-based networks (see Figure 1). Packet-based networks include IP–based (including the Internet) or Internet packet exchange (IPX)–based local-area networks (LANs), enterprise networks (ENs), metropolitan-area networks (MANs), and wide-area networks (WANs). H.

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  • Wireless communications is one of the most active areas of research over the past and the current decades. In fact, the demand for wireless services has been changing from the regular voice telephony services to mixed voice, data, and multimedia services over the wireless media. Since the mid-1990s, the wireless industry has been advancing at an incredible speed. For example, the 2G cellular systems (such as GSM, D-AMPS, and IS-95) have significantly improved the spectral efficiency and network capacity to support wireless telephony services....

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  • Currently, users identify wireless networks with first- and second-generation cellular telephony networks. Although voice and short messaging have driven the success of these networks so far, data and more sophisticated applications are emerging as the future driving forces for the extensive deployment of new wireless technologies. In this chapter, we will consider future wireless technologies that will provide support to different types of traffic including legacy voice applications, Internet data traffic, and sophisticated multimedia applications...

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  • In recent years, wireless and mobile communications have seen explosive growth both in terms of the number of services provided and the types of technologies that have become available. Indeed, cellular telephony, radio paging, cellular data, and even rudimentary multimedia services have become commonplace and the demand for enhanced capabilities will continue to grow into the foreseeable future [6, 12, 43, 46].

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  • Chapter 2 - The internet & the world wide web: Exploring cyberspace. This chapter includes contents: connecting to the internet: narrowband, broadband, & access providers; how does the internet work? The world wide web; email & other ways of communicating over the net; the online gold mine: telephony, multimedia, webcasting, blogs, e-commerce, & social networking; the intrusive internet: snooping, spamming, spoofing, phishing, pharming, cookies, & spyware.

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