I would like to know why the Base station transmits higher frequencies
a)when the power required to transmit higher frequencies is more.
b)Higher the frequency shorter is the distance travelled by the wave.
Reference to your first reply about the question of our friend Madan, It is Ok that the power saving should be at the mobile station due to its low power budget while the base station has a reliable and continuous power resources, but the question is what is the relation between signal quality and the frequency if it is higher or lower.
base station transmit at down link ferquency band of930–960mhz because as u know higer the frequency lesser is the travelled distance.so in case of base station we can transmit at higer power and at higer frequency.
,while ms(mobile station )should be transmitting at lower frequency band ie—890–915Mhz(uplink) Mhz so it is more easy for mobile station to transmit to the base transiever station at lower power and that will consume less battery power .
the GSM 900 frequency is:
uplink is 890-915 MHZ
DOWN LINK IS 935-960
GSM (DCS)1800 frequency is:
up link 1710-1785MHZ.
down link is 1805-1880 MHZ.
gsm(PCS) 1900 frequency:
up link 1815-1910 MHZ
down link 1930-1990 MHZ