Question

In GSM systems the signal direction from the
mobile station to the network or the base station is
referred to as uplink. Why are lower frequencies given
to the uplink? A mobile network operator was
allocated uplink frequency (890-915MHz) and
downlink frequency (935-960MHz). Calculate the
number of available RF channels for this operator and
the duplex distance if the spectrum has a carrier
separation of 100kHz. Why are Telco’s more
interested in Radio channels?

Answer 1

Lower frequencies are given to uplink because it is hard for mobile stations to transmit at large power and compensate for the losses that ever occured. Lower frequencies offer lesser space path dropping or loss.

The available channels would be around 124 with 45 MHz duplex spacing.

Radio channels offer audience target capabilities. It is easy to pinpoint the right kind of audience with Radio. It helps in targeting and reaching out to the good number of sales with age group, demographics, etc.