How to understand of mobile data networks (GSM, CDMA, TDMA, GPRS, EDGE, UMTS)

Mobile operators will in mobile data services often involve a number of complicated abbreviations that are not entirely clear from them what you can expect in practice. This article the first part represented by technologies that in the Bangladesh have the largest coverage - the GSM, CDMA, TDMA, GPRS, EDGE, and UMTS.

GSM:

GSM stands for Global System for Mobile Communication. This network provides us Grameenphone and Robi. In the area of data services offers a very slow data connection speeds of 9.6 + 9.6 k-bit / s (speed will be featuring in the downlink  + uplink, which is important to consider when sending emails or recording data on your company's FTP server.

GSM network is now old purely on voice services. The data portion used today basically just a special encryption using phones as it will also bring in some industrial applications. For GSM as u only pay for data transfer by time and not by the volume of transmitted data. GSM network has coverage in all six BD operators almost the whole country. GSM networks fall into the category of. 2nd generation mobile networks.

GPRS:

GPRS or General Packet Radio Service is a mobile data network, which is added to the GSM network. With that shares all the radio part of the network as well as some elements of the backbone. Therefore, you will frequently encounter labeled GSM / GPRS. GPRS technology is also used occasionally marking grid 2.5 generation (2.5G). GPRS offers theoretical speeds of up to 85.2 + 42.6 k-bit / s.
In practice counting with more speed around 50 + 25 k-bit / s. GPRS is, therefore, now-a-days practically applicable only to small e-mails, surfing very slow in the mobile phone or called. Instant messaging. GPRS network coverage in the Bangladesh can be found wherever there is available GSM network coverage. GPRS offer in the Bangladesh, GrameenPhone, Banglalink, Citycell, Airtel, TeleTalk and Robi.

EDGE:

EDGE is basically a slightly modified version of GPRS (specifically here changed the modulation signal of GMSK and 8PSK on little has changed its encoding). EDGE offers theoretical speeds of up to 238.6 k-bit / s + 119.3 k-bit / s.
In practice, reach a speed of around 100 to 150 k-bit / s + 50 k-bit / s. Neither EDGE and already today is not applicable for surfing the web from your laptop or for processing large mail. For smaller mails and surfing the mobile phone with him but can easily manage. Emergency surfing from a laptop when you (eg. Resign off pictures and videos, )it can also be used. 

Moreover, all six Bangladeshi Mobile operators in recent years to invest in the modernization of 3G networks, making it now at GrameenPhone EDGE already available everywhere in Bangladesh and GrameenPhone offers it to 70% of the population (ie. Almost everywhere). EDGE bit behind but gradually until about the other five designated catch up.

The disadvantage of EDGE and GPRS tended to be the fact that when you have just downloaded the data, so you can not reach. Banglalink and Robi has this problem by completing the modernization of the network completely removed.
In the remaining five operators, can be assumed that the problem goes away with the completion of recovery of the GSM / GPRS/ 3G networks. EDGE technology is also sometimes referred to as technologies 2.75. generation, which illustrate the fact that it is just faster than GPRS. In practice, it is just the first EDGE technology for mobile data networks, which now has the practical usage make sense to start thinking.

All the 3G is grinding poverty:

Generally it can be stated that all mobile data networks 2nd, 2.5 or 2.75 generation are today for practical use, so to speak grinding poverty. With the use of GSM for data transfer already about to encounter, because, outside large cities, it is often the only technology for mobile data accessed directly from a regular mobile phone.
EDGE is suitable only for emergency surfing the web. For all these networks with us, unfortunately, true that their coverage is significantly lower than in networks GSM / GPRS / EDGE.

Cellular transmission Techniques:

FDMA

( Division Multiple Access Frequency, Frequency Division Multiple Access ) techniques based Cellular transmission mode Digital.

TDMA

(Division Multiple Access Time, Time Division Multiple Access) - CDMA (Division Multiple Access Code , Code Division Multiple Access) Actually, there are only two physical mode of signal transmission by means electronic: Digital and Analog ; else are variants, or; washed from brain .So no more (ie) the signs of smoke, telepathy and GSM actually are not new forms of transmission electron of information.
From the Digital mode, based TDMA technique arises; TDMA from the emerging marks PDC and

GSM

From the Digital mode, the technical basis CDMA, comes in different generations (CDMA2000 is a third generation CDMA)
The PDC ( Personal Digital Cellular) and the GSM, is one based on TDMA system, and only used Japan, but the similarity and alliances business, shares elements of GSM.

Another post of dedicated networks and technologies, UMTS, HSDPA, HSUPA, HSPA + and LTE can be found here.