Recursos VoIP - Enlaces

Fuente: Birdstep Technology
Formato: PDF

This whitepaper starts by outlining application areas (this includes requirements for enterprises and operators), then it describes some of the existing approaches to solve such requirements, it then explains how the Birdstep Mobile IP client is designed to solve the requirement of seamless VPN and finally it explains the automatic configuration features of the Mobile IP client. This paper focuses exclusively on the Universal Edition of the new Mobile IP client from Birdstep.

Fuente: Intermec Technologies
Formato: PDF

Wireless system standards and significantly reduced hardware prices have fueled an unprecedented boom in wireless networking, whetting people’s appetites for mobile wireless data communication and broadening the business model to accommodate the needs of the mobile worker. In this white paper we present four major reasons that make wireless networking a compelling choice.

Fuente: QUALCOMM
Formato: PDF

Although an operator's choice of a WLL technology may often depend on frequency band allotments, other factors such as infrastructure and handset availability, cost (which mainly depends on volume), spectral efficiency and data services capabilities of the technology also matter. CDMA2000, a 3G mobile communications technology, has been chosen by many operators as a preferred solution for their WLL requirements. CDMA2000 is delivering on the 3G promise today. This white paper is intended to provide a high-level analysis of how CDMA2000 mobile technology and its features can be leveraged successfully in the wireless local loop environment.

Fuente: Synergy Systems
Formato: PDF

There are a lot of information out there about CDMA and WCDMA and a person could easily get confused about the technology because of various names. This paper's goal is to help make it a little clearer on CDMA and 3G. cdma2000 is a name identifying the third generation technology that is an evolutionary outgrowth of cdmaOne offering operators who have deployed a second generation. cdmaOne system is a seamless migration path that economically supports upgrade to 3G features and services within existing spectrum allocations for both cellular and PCS operators.

Fuente: Texas Instruments
Formato: PDF

The purpose of this paper is to describe the beneficial effects on the economics of 3G channel card design brought about by the introduction of TI's high-density TMS320TCI1x UMTS Infrastructure Chipset. The paper considers the current needs of the changing wireless landscape. The paper breaks down the costs facing 3G basestation OEMs. The paper enumerates the various architectures from which manufacturers can choose to design their solutions.

Fuente: University Carlos III of Madrid
Formato: PDF

Web pre-fetching is a technique that tries to improve the QoS perceived by a user when surfing the web. Previous studies show that the cost of an effective hit rate is quite high in terms of bandwidth. This may be the reason why pre-fetching has not been commonly deployed in web proxies. Nevertheless, the situation can change in the context of 3G, where the radio access is a shared scarce resource and the operator may find useful to exchange fixed-network bandwidth by perceived QoS for subscribed customers.

Fuente: Institute of Electrical and Electronics Engineers
Formato: PDF

In this paper we develop a methodology to set the VoIP application parameters (voice packet size and dejittering delay) and the UMTS air interface parameters in such a way that the quality of VoIP calls involving a UMTS party is ensured. We use analytical techniques to determine the delay and packet loss contributions of the various transmission stages crossed by the voice packet flow, and the E-model to predict the perceived quality. Our numerical results show that provided the parameters of the VoIP application and the UMTS air interface are chosen properly, UMTS access and the stringent delay and packet loss requirements of VoIP are reconcilable.

Fuente: Cisco Systems
Formato: PDF

Cisco actively participates with all standards organizations and industry forums that are defining the IP Multimedia Subsystem (IMS) and IMS-based standards for all service provider segments. Cisco understands the unique service delivery and networking concerns that confront mobile carriers, wireline providers, and cable/Multiple System Operators (MSOs) as they pursue such a dramatic transformation. The Cisco IP Next Generation Network (IP NGN), which includes the Service Exchange Framework (SEF), supports IMS, simplifying and accelerating the delivery of Session Initiation Protocol (SIP) applications. Because not all of a provider's offerings are SIP-based, the Cisco SEF helps carriers quickly and profitably deploy both SIP and non-SIP services.

Fuente: Cisco Systems
Formato: PDF

To help service providers make a successful transition to these new opportunities, Cisco Systems has developed an architecture called the Cisco IP Next-Generation Network (IP NGN). Cisco IP NGN helps service providers develop and plan their organizations, their specific network architectures, and business models for the future. Within the NGN arena, a new set of standards is gaining momentum. The IP Multimedia Subsystem (IMS) is an open, standardized architecture that aims to merge multimedia services across the cellular world and IP networks, using the same standard protocols for both mobile and fixed IP services. Based on Session Initiation Protocol (SIP), IMS defines standard control plane interfaces for creating new applications.

Fuente: Hewlett-Packard
Formato: PDF

HP is developing a range of solutions that can be used to implement the content and event charging functionality of 3G services. To ease the implementation and development of such solutions, HP has defined the Content Mediation and Charging (CMC) framework. The HP CMC solution enables successful billing of mobile data, which is key to profitability in a voice, data and content environment. The HP CMC solution fully supports a strategy shift from a network-centric focus on delivering voice services to a rapidly expanding subscriber base, to a customer-centric focus aimed at delivering a rich portfolio of voice and data services that results in a significant increase in average revenue per user (ARPU).

Fuente: Liverpool John Moores University
Formato: PDF

Third Generation (3G) radio networks are based on the code division multiple access technology (CDMA) and are currently being installed in countries such as Japan and South Korea. Coverage and capacity are important issues in the planning process for cellular Third Generation (3G) mobile networks. The planning process aims to allow the maximum number of users sending and receiving adequate signal strength in a cell. This paper presents calculations for capacity, coverage for 3G networks.

Fuente: Swedish Institute of Computer Science
Formato: PDF

This paper reports on the suitability of 802.11b networks for real-time voice traffic. It measures 802.11b VoIP parameters in an outdoor environment, inside an office and considered the effect of competing traffic. Additionally the paper investigates the influence of the 802.11b protocol itself. It concludes that 802.11b can support real-time voice sessions for the scenarios included in this paper with the notable exception of a VoIP stream competing against multiple TCP sources in infrastructure mode.

Fuente: University of Hong Kong
Formato: PDF

In the most general sense any kind of reorganization is a kind of restructuring, so the first delineation that makes sense is to distinguish between 'internal' and 'external' restructuring, where 'internal' can refer to any reorganization within a company's setup. This paper considers the issue of restructuring in the context of uncertainty as the industry moves into the world of broadband Internet, and in particular the unanticipated implications of the 3G auctions for the largely involuntary restructuring that followed.

Fuente: University of Hong Kong
Formato: PDF

This paper introduces the prototype of design and implementation of a VideoConferencing (VC) system and protocol for 3G networks based on the 3G-324M protocol stack. Efficient multimedia processing and intelligent MCUs (Multipoint Control Unit) for efficient token transfer among a group of terminals are presented. The prototype system has shown its performance for VC in WLAN environment.

Fuente: Hewlett-Packard
Formato: PDF

The dynamics of mobile streaming media are inherently different from the rest of the streaming media market. Mobility is dependent upon the availability of a network, which supports streaming solutions. Trials and limited deployments of multimedia message services have begun on GPRS and other enhanced 2G networks as wireless operators cannot wait for widespread adoption or availability of 3G. However, mass deployment and support of rich content streaming media services is dependent on 3G networks. 3G networks will support high-speed data transmission (up to 144kbps) and IP-based services.