September 14, 2014

WCDMA Technology

The offered services can be: audio, voice, text, image, video, signalling and data. In Brazil the frequency band that will shelter this standard will be of 1,9GHz.Aps the general specifications of system IMT-2000 some companies had initiated the elaboration of proposals for implantation of the service. Of thirteen proposals it presents only four had been selected: DECT, WCDMA, UTRA and CDMA2000, resulting in the junction of two proposals: the UTRA and the CDMA2000, appearing the called standard universal system telecommunications mobile UMTS). The UMTS is in phase of implantation for some operators of cellular in the Brasil.Atributo de UsurioVelocidade in Km/hEstacionrio0Km/hPedestreAt 10Km/hVeicular of low velocidadeAt to 100Km/hVeicular of high velocidadeAt 500Km/hAeronuticoAt 1.500Km/hSatliteAt 27.000Km/hTabela 2 Attributes of users of standard IMT-2000O standard 3G foresees the supply of the services that had been considered by the digital net of integrated services (RDSI) .CAPTULO 3 TRANSMISSION OF DATA IN the NET OF TELEPHONY MVELA industry of mobile telephony grew in rhythm sped up in the two last decades. The mobile Internet is a market in development and with developed potential of exponential growth on the platform of the cellular net, representing new model business-oriented for operators of the system and greater comfort for the user. The transmission of data for the net of mobile telephony is a demand of the market supported for the technology. In this context, market e> technology if complements and if they defy at the same time. Currently, two models exist standards for transference of data in the cellular net: the protocol WAP and standard GPRS/EDGE.A transmission of data for the net of mobile telephony were propitiated by the second generation of cellular, that it disponibilizou some services point the point and point multipoint as telemetry, quotations of currency, etc.

With 2G the services of sending of short messages (Shorts Messages Services - SMS) and the first transmissions of data had been disponibilizados point-the-point through connections in dedicated circuits. Some operators of mobile telephony in the world had tried, separately, to develop technology who made possible the transmission of data saw cellular. However, it was arrived conclusion of that technician and economically, was impossible to create an including technology in individualizado way e, being proprietor, would bring little benefit for the user and low profitability for the supplier. According to OMA (2007), the main problems were: the cost with research OMA) of is part currently the WAP Frum.O WAP Frum one is formed by approximately 350 on companies to the sector of present technology in telecommunications constitutes the OMA. The main objective of the WAP Frum is to create technology of access and standardized services directed toward transmission of data and the access to the Internet from the telephony net mvel.3.1

Sep 14, 2014 7:19:34 AM

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