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General Packet Radio Service is  a standard for wireless Communications. The service facilitates access to Internet at Higher speeds. This enables services such as colour Internet browsing, e-mail on the move, powerful visual communications, multimedia messages.





The core network in GPRS (General Packet Radio Services) refereed to as the 2.5G wireless packet data networks will provide interoperability between the radio access network (RANs) and the external networks[1]. It will also provide and support the feature servers operators will deploy for increasing the number and variety of subscriber services. The core network extends internet protocol based packet data services to the radio access infrastructure and hence is capable of routing IP packets within the context of mobility. The basic GPRS core network infrastructure and elements will also be used in the release 99specifications for the 3G UMTS core networks which use the European wideband CDMA air interface standard. Therefore a discussion of the GPRS core network should cover the basic core network infrastructure and function in the 3G UMTS networks, as well.

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*   Chat
*    E-Mail on the move
*    Information Services
*    E-commerce
*    File Transfer
*    Moving Images
*    Remote LAN Access
*    Banking
*   Web Browsing and Downloading

The voice mail sercvices are proving to be the key factor for mobile operators to keep up with new services the market demands as they represent the means to enhance significantly the quality of the service, increase the customer base and speed up the development of the network.

Voice mail services will offer great benefits to the operator as well to the subscriber: the former wants higher profits, while the latter wants to communicate better. To accomplish this, the operator must stimulate traffic demand while the subscriber has to recognize the advantages of the new features, both at work and at home.

In the future, voice mail services will likely pave the way for the introduction of other advanced and innovative services, such as SMS and high-speed data services. Services such as specific point-to-point and point-to-multipoint services are supported for applications such as traffic telematics and UIC train control. A set of advanced services will be offered for bussines establishment and private people.

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The emerging 3G networks have been designed with wideband capabilities, allowing significantly higher data rates for mobile multimedia and Internet-based services of the future. The effects of the introduction of packet-switched services as well as higher data rates will pose significant challenges to the design of the core networks. The design of the core networks involves issues related to node location and dimensioning, the choice of appropriate transport technologies, interconnect topologies, traffic considerations, interconnect sizing and quality of service. This paper has reviewed the alternative choices and their merits as well as some of the design parameters that the network operator will face in providing a cost effective network to provide the necessary performance. Building the core network requires an operator to make several decisions, which will affect the scalability, reliability, quality, and cost of the network.

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