
48 ◾ IP Communications and Services for NGN
achieving high transmission rates. As such, this task group has objectives for the
future to evolve WiMAX to fulfill the requirements of future 4G mobile communi-
cation networks. rough multihop relay, the coverage range can be increased sig-
nificantly at low cost. Coverage range often shrinks due to the shadow fading effect
experienced by base stations. Relay communication mitigates this by ensuring a
smooth and continuous large rate over a large distance. us, coverage is increased
at low cost. Furthermore, by adopting selective power amplification, it amplifies the
desired signal per situation.
WiM