why in GSM 900,1800 UPLINK FREQUENCIES ARE SMALLER THAN DOWNLINK FREQUENCIES?
niru_38 10-September-2008 10:28:49 PM
Comments


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.
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.
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 -
Posted by waqasahmad


The main reason is POWER difference between BTS and MS.
Posted by HamidAliKhan


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


Posted: 13-September-2008 01:44:25 AM By: sagitraz

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.

Posted: 12-November-2008 11:46:12 AM By: waqqas1

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

Posted: 28-December-2008 01:05:03 AM By: HamidAliKhan

The main reason is POWER difference between BTS and MS.

Posted: 31-January-2009 11:42:54 AM By: waqasahmad

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 -

Posted: 31-January-2009 12:06:14 PM 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.

Posted: 31-January-2009 12:09:39 PM 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.