Today's work force is demanding mobility, flexibility and real-time access to critical data. Over recent years, the trend towards the smaller and faster device, coupled with the need for information access on the move, has paved the way for a new technology of the Mobile Communications. Mobility is the ability to access information and services anywhere anytime anyhow. On the telecom front, numerous wireless technologies have been introduced in the country. It started with Global System Mobile telecommunications (GSM) based mobile phones, and today we can see General Packet Radio Service (GPRS) technologies being implemented as well.
This presentation involves the two ‘hot' telecom technologies fighting out in the markets, namely GSM and GPRS. It also includes a detail explanation of the advantages they offer, how they work, and their limitations. Also explained are some of the possible applications that can be made possible with them. Before going in detail into these technologies, a look towards the Basic Cellular Architecture has been made.
[...] A cellular mobile communication system uses a large number of low-power wireless transmitters to create cells the basic geographic service area of a wireless communication system. Variable power levels allow cells to be sized according to the subscriber density and demand within a particular region. As mobile users travel from cell to cell, their conversations are “handed between cells in order to maintain seamless service. Channels (frequencies) used in one cell can be reused in another cell some distance away. [...]
[...] Designed to supplement the existing mobile technologies, like GSM, CDMA, TDMA etc, GPRS aims to provide anytime-anywhere always-on” network connections to mobile devices. GPRS also enables mobile networks to provide speeds much higher than those offered by GSM alone Why GPRS? Though GSM uses circuit switching like a telephone line, data transfer over GSM is not quite the same as that over the PSTN line. For each of our data requests (Over GSM), first, a connection is established without network, our request sent, the data received and then, and this is important, that call is disconnected. [...]
[...] But once the connection has been established, communication is, for all practical purposes, instantaneous. The connection is maintained- even if no data transmission is taken place-until either side explicitly terminates it. Thus, all information travels the same path from the sender to the receiver and arrives in the same order as it was sent Packet Switching Using packet switching, however, eliminates the need to establish a connection before transmission can begin. The information to be sent is broken down into packets (of fixed size) and sent on to the network one after the other. [...]
[...] Conversations can be handed off from cell to cell to maintain constant phone service as the moves between cells The base station communication with mobiles is through a channel .The channel is made of frequencies, one for transmitting to the base station and one to receive information from the base station Cellular System Architecture Increases in demand and the poor quality of existing service led mobile service providers to research ways to improve the quality of service and to support more users in their systems. [...]
[...] A network would have as many as GGSNs as the number of external packet switching data networks linked to it Conclusion GPRS, which uses packet switching network, offers a better data transfer rate and proved to be a better communication system than circuit switched GSM. GPRS enables an existing GSM network to communicate with any applications and/or network that uses packet switching. Thus it allows mobile networks to connect to the INTERNET (and other IP and X.25 networks) G GPRS is [...]
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