a) For a cellular mobile system, the ratio of carrier-to-co-channel interference (C/I) at a mobile is required to be gre

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a) For a cellular mobile system, the ratio of
carrier-to-co-channel interference (C/I) at a mobile is required to
be greater than 23 dB. If a 4-cell cluster pattern were to be used
show, with the aid of sketches, which of the following options
would be acceptable in a fully developed cellular mobile
system.
i) All base stations have omnidirectional antennas
ii) All base stations have 120 degrees sector antennas
iii) All base stations have 60 degrees antennas State clearly
all assumptions made in your derivation. (15 marks)
b) For the acceptable choice of base station antennas, calculate
the traffic per cell which could be supported. The total number of
RF carriers available is 42. Each digital channel is 200kHz wide
and supports 8 timeslots per carrier. Assume also that all RF
channel timeslots are used for carrying traffic only. Assume a
blocking probability of 2%. (5 marks)
c) If the requirement is to support a traffic intensity of 3
Erlangs per square km, calculate the hexagonal dimension R of a
typical cell. (5 marks)