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Hi. If you mean why is the downlink frequency higher than the uplink frequency, it's because - all other things being equal - signals propagate for less distance the higher the frequency gets.

Having the (slightly) lower frequency transmitting from the handset allows for a slight advantage in achievable propagation distance from the handset to the base station. The base station has more power and larger antennas, so it can usually transmit further than the mobile station.

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Posted by jahangir1983

Hi. If you mean why is the downlink frequency higher than the uplink frequency, it's because - all other things being equal - signals propagate for less distance the higher the frequency gets.

Having the (slightly) lower frequency transmitting from the handset allows for a slight advantage in achievable propagation distance from the handset to the base station. The base station has more power and larger antennas, so it can usually transmit further than the mobile station.

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Posted by jahangir1983

1 GSM frequency bands. 1.1 GSM-900 and GSM-1800; 1.2 GSM-850 and GSM-1900 ... the base station (uplink) and 935–960 MHz for the other direction (downlink), ...for more details
en.wikipedia.org/wiki/GSM_frequency_bands - 48k -

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Posted by waqasahmad

The main reason is POWER difference between BTS and MS.

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Posted by HamidAliKhan

The power difference btwn BTS and Mobile is the main reason.

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Posted by waqqas1

Hi. If you mean why is the downlink frequency higher than the uplink frequency, it's because - all other things being equal - signals propagate for less distance the higher the frequency gets.

Having the (slightly) lower frequency transmitting from the handset allows for a slight advantage in achievable propagation distance from the handset to the base station. The base station has more power and larger antennas, so it can usually transmit further than the mobile station.

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Posted by sagitraz