GSM Technology

Write-up by Dhruba M

GSM is the most popular standard for mobile phone service in the world. In a lot more then 200 countries in the world individuals using GSM mobile service. Nevertheless, distinct countries use distinct GSM Radio frequency for their mobile networks. Worldwide four frequencies are widely used for GSM mobile services. They are 850MHz, 900 MHz, 1800MHz and 1900MHzAlthough 850, 900 and 1800, 1900 frequency are quite close, usually mobile phones can’t obtain much more then 1 frequency at-a-time, a phone that works with one band, can not receive signals of other bands. So if you want your mobile to work with numerous bands, you need to have multi band mobiles. Based on your need, you can go for dual, tri or quad band mobile set.As a entire, both high and low frequency bands have some benefit and disadvantages. For high frequency service, the network is less effected by the influences of the weather. And you can have much more clear and un-interrupted connection. Another benefit of a high frequency is that you only require modest antenna. Major disadvantage of higher frequency band is its lower reach. These bands are good for cities where density of mobile users is a lot more. Where as, lower frequency bands are good for rural areas due to the fact of their big region reach.850 MHz is the lowest frequency used for GSM mobile service. As a result of this, 850 MHz network has a larger and a lot more penetrating reach then the 900, 1800 and 1900 MHz network. Apart from that, the difference between the 850 MHz and the 900 MHz network hardly noticeable. Lower frequency services are great in large building because of their much more penetrating reach. A disadvantage of a low frequency network is its low capacity.900 MHz networks are very old networks. Like 850 MHz, 900MHz also has a bigger and much more penetrating reach then the 1800 and 1900 MHz network.1800 MHz is a comparatively high frequency for cellular phones. Simply because of this, 1800 MHz networks have a smaller and less penetrating reach compare to 900 and 850 MHz networks. By this the reach in huge buildings is low. An benefit of 1800 MHz networks is that the capacity is larger. This band is idle for cities where density of mobile users high.1900 MHz readily available only in North America, some networks in Canada and South Africa. This band is not accessible in Europe or Asia. 1900 MHz quite comparable to 1800MHz. Because of high frequency 1900 MHz band network isn’t interrupted by the influences of the weather and you can have a crystal clear connection most of the times. For this network, GSM provider requirements to use a lot more mini antennas. An benefit of 1900 MHz networks is that the capacity is larger.

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