A load-based transmission power control scheme for CDMA slotted-ALOHA packet radio communications

CDMA cellular slotted-ALOHA communication systems with open-loop power cont rol suffer a drastic degradation of throughput under heavy channel loads. T his degradation becomes a serious problem when systems offer services in wh ich traffic control is difficult to implement. This paper proposes an adapt ive transmission power control scheme to reduce throughput degradation unde r heavy channel loads. This scheme controls the target received power accor ding to both channel load and mobile station location. The target received power for each mobile station is controlled to make use of the capture effe ct under heavy channel loads. Computer simulation validates the effectivene ss of this scheme: throughput performance is improved and therefore the pro posed scheme can expand the allowable load area. (C) 2000 Scripta Technica, Electron Comm Jpn Pt 1, 84(1): 31-39, 2001.