Downlink transmission power control for CDMA/shared-TDD packet communications in cellular environments

The inter-cell interference between uplinks and downlinks in CDMA packet co mmunication systems, employing a shared-TDD scheme, is evaluated under cell ular environments. It is found that interference between base stations rare ly degrades uplink throughput. but interference between mobile stations sub stantially degrades downlink throughput. A transmission power control schem e is proposed to improve the downlink throughput. The proposed scheme incre ases the transmission power of downlink packets when they are re-transmitte d, and thus, improves the signal-to-interference ratio of the downlink re-t ransmission packets. Computer simulation shows that this scheme increases d ownlink throughput without sacrificing the uplink throughput until the upli nk throughput reaches a maximum value.