Department of Electrical and Computer Engineering
M.S. Thesis Abstract
Channel Allocation & Power Control in IS-136
In the North American TDMA digital cellular standards , the downlink is constrained in that the base station transmit power has to be kept constant over a frame. This implies that the base has to transmit over the entire duration of a frame even if there is just one active user in that frame. This introduces additional interference on the downlink in the unoccupied slots in a partially occupied frame and hence substantially reduces capacity. Ideally, we would like to vary the base station transmit power every slot and turn off during idle slots.
We evaluate the penalty in keeping the base transmit power constant over a frame as opposed to the ideal scheme of varying the powers every slot. We explore schemes like carrier packing to reduce the additional downlink interference and investigate various combinations of channel allocation, power control and hando# algorithms and their effectiveness in mitigating the above problem.
Thesis Director: Professor Roy Yates