Abstract
In modern wireless communication systems, power control plays a fundamental
role for efficient resource utilization, in particular in the systems
where the users share the same bandwidth at the same time. In such
systems, in fact, many users transmit over the same radio channel
using the same frequency band and time slots so that the signal of
an individual user becomes interference for the other users. Hence
the transmission power levels need to be smartly manipulated so as
to achieve an adequate quality of service for as many users as possible
and, thus, an efficient network utilization. Conventional power control
algorithms adopt the Signal-to-Interference-plus-Noise Ratio (SINR)
as controlled variable and neglect the important effects of the manipulated
control variables (transmission powers) and of the retransmission
mechanism on the queueing dynamics. In this paper, we pursue a different
queue-based approach which takes into account the queueing dynamics
and adopts the queue size as controlled variable. In particular,
a novel queue-based power control algorithm with low on-line computational
burden is proposed and its performance is evaluated both theoretically
and via simulation experiments.
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