Recursos VoIP - Enlaces

Fuente: Deb Shinder
Formato: PDF

The next step in network convergence is the combination of VoIP and wireless networking technologies. Although VoIP over wireless offers benefits, the technology isn't without drawbacks. Deb Shinder describes the advantages and challenges of VoIP over wireless.

Fuente: Harris
Formato: PDF

Incumbent users of fixed links in the 2 GHz band should see relocation as an opportunity to upgrade and enhance their existing systems. The next anticipated round of relocation will keep relocation designers, incumbent network operators, vendors' and network designers very busy, so early planning is key. Incentives for early relocation include a better choice of frequencies, an easier move and the early use of new upgraded equipment. As a full service vendor of relocation services and equipment, and a long-time provider of turnkey microwave communication systems, Harris has discovered a number of ways of meeting the needs of its clients with reliable, timely, high-performance and cost effective solutions.

Fuente: Teleca
Formato: PDF

The emergence of the third generation (3G) of mobile services, devices, and networks means that the connected society is here, together with its ubiquitous online services. This white paper presents an overview of critical business and technology aspects for operators and service providers with or without 3G frequency spectrum that currently struggle with the question of how to move their business over to a 3G basis.

Fuente: Technical University of Berlin
Formato: PDF

Traditional voice communication services have no potential for generating enough profit and bringing the expected return on investment on the 3G infrastructures and licenses. Operators' role could not be confined anymore to transport information. Therefore, actors in the mobile marketplace should be able to deliver an integrated value proposition that fulfills their customers' needs and supports business processes efficiently.

Fuente: Alcatel
Formato: PDF

This paper describes the evolution of 3G with HSDPA. This paper first explains market and technical motivations. Then the different introduction phases of HDSPA to the market are handled, improving the data throughput and the spectral efficiency in a step by step approach. Further subjects are an overview of the basic features for HSDPA phase 1, a system overview and the impact of introducing this functionality into the RNC and Node B. In a next chapter the basics of HSDPA phase 2 are explained with some remarks to Node B V2 HW impacts.

Fuente: Lucent Technologies
Formato: PDF

There is a segment of the market that demonstrates a pent up demand for a service based on 3G. Today, a huge number of enterprises need to rapidly deliver large amounts of data to their mobile workforces. Only a 3G High-Speed Data (HSD) service can deliver the speed and throughput that will satisfy the enterprise users' minimum service level demands. To win in the market for 3G HSD, operators need to move fast. Historically, one or two players have dominated the enterprise market for mobile services in most European countries. Lucent's primary research suggests the same will be true for the UMTS enterprise market.

Fuente: Brunel University
Formato: PDF

A 3G wireless solution for the OTELO system - a wireless tele-echography robotic system is introduced in this paper. Based on the analysis and understanding of the OTELO functional modalities, the IP Multimedia Subsystem (IMS) is introduced in the 3G wireless solution to the OTELO system. The OTELO system architecture identified for OTELO functional modality is illustrated. Quality of Service (QoS) issues for tele-robotic control and tele-echography image transmission are also discussed.

Fuente: RADVISION
Formato: PDF

VoIP defined new levels of communication services. 3G-324M enables these services using the current CS infrastructure to become a reality. 3G-324M enables 3G conversational services by gluing a new, proven technology with an existing, well-deployed legacy technology. All other common IP services, such as web browsing and e-mail, are enabled by reusing the cell phone as a modem to connect with an ISP, similar to the method used with 2G cell phones today. From the users' point of view, a new adventure world of conversational services is becoming available with the 3G-324M.

Fuente: Technical University of Denmark
Formato: PDF

The main question in this paper is: Which standard/technology will win the 3G mobile market? The most prominent contenders are WCDMA (also known as UMTS) and cdma2000. In addition, EDGE will also play a role as will (presumably) the Chinese TDSCDMA standard1. Furthermore, other kinds of wireless solutions such as WLAN (WiFi) are spreading fast and may pose a threat to (or complement) the cellular mobile technologies. Such phenomena should not be overlooked. However, this paper concentrates on 3G technologies and specifically on the two main contenders, WCDMA and cdma2000.

Fuente: North Star Leadership Group
Formato: PDF

After years of visionary hype, hope, and investment, third-generation wireless devices are here. The technology works fine. But the visions that drove those billions into 3G infrastructure have fallen flat. Still, for several players, 3G may be the investment that saves the company. Even without vision, and killer apps, and videophones, 3G can put major points on the scoreboard: market share gains for some, lower churn for others, and big increases in ARPU?even in a no-growth economy. The trick is understanding which part of the 3G playbook will work best for your company.

Fuente: European Communications
Formato: PDF

3G has been developed by the ITU (International Telecommunications Union) initiative IMT-2000 (International Mobile Telecommunication 2000). 3G will ensure interoperability and compatibility between differing 2G mobile systems, such as CDMA (Code Division Multiple Access) and TDMA (Time Division Multiple Access). 3G is a revolution in most respects. It is broadband and packet-based, allowing always-on Internet access and multimedia data transmission at 2Mbps (stationary) and 384kbps (mobile). And these fast, rich services will be the same anywhere in the world.

Fuente: McMaster University
Formato: PDF

In today's world, it is necessary to be able to access information everywhere, however in the past, this has been limited to the hardware available and consequently most people were bound to an office or desk at home. With the new technology that is emerging, wireless communication is breaking these barriers and allowing communication from virtually everywhere on this planet, limited only by the imagination of the engineers behind this technology. This paper will give a short discussion on 3G wireless communications and the impact it is having on the society one lives in.

Fuente: 3G Americas
Formato: PDF

In early 2003, 3G Americas reported on the progress of the Third Generation (3G) UMTS technology, noting that the industry was preparing for widespread commercialization of UMTS. Now, in less than two years, there are 53 3G UMTS networks in commercial service in 27 countries3 and many other UMTS networks in pre-commercial or trial phase with still other networks in planning/deployment stages.

Fuente: Institute of Electrical and Electronics Engineers
Formato: PDF

The growing importance of wireless networks requires an effort from the research community for the optimization of the transmission protocols, in order to achieve the best performance. This paper presents a novel approach for the performance enhancement of the most commonly used Transport Protocol (TCP) in a wireless environment. Cross-layer collaboration, achieved through the introduction of an ARQ Snoop agent within the protocol stack of a wireless host, creates the possibility for the exploitation of link layer ARQ messages within the TCP acknowledgement scheme, to the aim of enhancement of the level of achievable throughput.

Fuente: Marconi
Formato: PDF

Universal Mobile Telecommunication System (UMTS) technology has the potential to dominate the mobile broadband service market. The vision to move from a telephone-centric to a third-generation (3G) multimedia mobile infrastructure, however, creates challenges for network architectures, standards, and technologies. These challenges can directly translate into added risk and costs for UMTS providers. The UMTS solution from Marconi provides a low-risk and cost-effective platform (in terms of CapEx and OpEx) for both the short and long term.