Service fairness in CDMA cellular packet systems with site diversity reception

This paper examines fairness of service in the up-link of CDMA cellular slo tted-ALOHA packet communication systems with site diversity reception. Site diversity rescues the packets originating mainly from near the edge of the cells, whereas packets originating near the base stations can not obtain t he benefits of diversity reception. This situation causes an unfairness in packet reception that depends on location of the mobile station. Two transm ission control schemes for reducing this unfairness are proposed. In the fi rst scheme. mobile stations control the target received poser for the open- loop power control based on the reception level of the pilot signals of the surrounding base stations. In the second, mobile stations control transmit permission probability. Successful packet reception rate, fairness coeffic ient and throughput performance are evaluated in fading environments with i mperfect power control. Computer simulation shows that both schemes improve service fairness for all mobile stations and throughput performances. A pe rformance comparison between the two schemes concludes that transmission po wer control outperforms transmit permission probability control as a simple technique for maintaining fairness of services.