May 2009 Mon 04Por Manuel Maqueda wireless providers 24 to 26 April 2009 was celebrated in the city wireless phones of Philadelphia, HTC the Latino Immigrant Voices conference, organized by the cellular phone plans Annenberg School for Communication at the University of Pennsylvania, along with La Casa Latina of the University of Pennsylvania, and the NGO Together / cell phones La Casa de los Soles.PeriodismoCiudadano was invited to attend this event, which had the opportunity to learn in detail a number of community newspaper experience developed by Hispanic immigrants in several cities in the United States. For over the next few days, we will be reviewing some of these initiatives. The UMTS Nextel cell phones network structure is composed of two subnetworks: Nextel the telecommunications network and network management. for all your Nextel Phones from the online site YouNeverCall The first is responsible for sustaining the flow of information between the ends of a connection. The second mission is the provision of means for charging and billing of subscribers, the registration and definition of service profiles, management and safe handling of their data, as well as the operation of the network elements, to ensure the smooth operation of this, the detection and resolution of faults, or anomalies, and also the recovery operation after periods of shutdown or disconnection of some of its elements. In this section we will analyze only YouNeverCall.com the first of the two subnetworks, namely telecommunications.
UMTS uses a land-based radio interface in a W-CDMA, known as UMTS Terrestrial Radio Access (UTRA). It cellular coverage supports time division duplex (TDD) and frequency division duplex (FDD). Both models offer information ratios of up to 2 Mbps
A UMTS network consists of the following elements:
Core network (Core Network). Incorporates the core network transport functions cell phones and intelligence. The first supports the transport of the signaling and traffic information, including commutation. Routing lies in the functions cellular providers of intelligence, which include benefits such as logic and control of Samsung certain services offered through a series of well-defined interfaces also include the management of mobility. Through the cellular phones core network UMTS connects with other networks, so it can communicate not only between UMTS mobile users but also with those Motorola who are connected to other networks.
Radio access network (UTRAN). Developed for high transmission speeds. The free phones radio access YouNeverCall network provides connectivity between mobile terminals and the Core Network. In UMTS is called UTRAN (Terrestrial Radio Access cellular phones Universal) and consists of a series of radio network subsystems (RNS) which are the communication mode of the UMTS network. A RNS is responsible for the resources and transmission / reception in a set of cells and is composed of one RNC and one or more nodes B. Nodes B are network elements that correspond to base stations. The controller of the radio network (RNC) is responsible for all resource slider phone control logic Nokia of a BTS (Base Transceiver Station).
EU (User Equipment). It consists of the mobile terminal and its module ID service user / subscriber (USIM) of the mobile phone SIM card.
Part of this structure would also transmission networks used Nextel to link the various elements within it. As protocols and UU IU.
An example of a connection YouNeverCall to the UMTS network from a terminal that would be explained in the following diagram:
We start with our device is a 3G mobile phone or a PC card compatible with this network, our data NodoB reaching that is responsible for collecting the signals emitted by the terminal LG and passed to the RNC for processing, these two components is what called UTRAN, UTRAN passes from the core of the network is divided into switches that distribute the data from the different systems, as they will either follow a path through the MSC (Mobile Services Switching Center) candy bar phone or the SGSN (Serving mobile phones GPRS Support Node) and then by the GGSN (Gateway GPRS Support Node).
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