Title :
Downlink throughput and fairness analysis in multi-rate CDMA systems
Author :
Cho, Jaeweon ; Hong, Daehyoung
Author_Institution :
Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea
Abstract :
This paper presents an analytical model and a method for the evaluation of the downlink throughput and fairness performance in multi-rate CDMA systems. We propose and use a model that can show the impact of self-interference to the received Eb/Nt. The analytical method reflects the effect of lognormal shadowing, the best BS connection procedure, the bit rate granularity and the peak available bit rate limitation, and the limited number of spreading codes. A scheduling scheme for the fairness control is also developed and applied. The performance of packet channels for delay-tolerant service is evaluated in a 3GPP WCDMA system model. The system performance measures include asymptotic throughput, fairness performance factor, outage probability, and code shortage probability. From the analysis results, we can draw the downlink packet transmission control policy that can improve the system performance
Keywords :
cellular radio; code division multiple access; packet radio networks; packet switching; probability; radiofrequency interference; 3GPP WCDMA system; asymptotic throughput; available bit rate limitation; base station connection procedure; bit rate granularity; code shortage probability; downlink fairness; downlink throughput; fairness performance factor; lognormal shadowing; multi-rate CDMA systems; outage probability; packet channels; scheduling scheme; self-interference; spreading codes; Analytical models; Bit rate; Control systems; Delay; Downlink; Multiaccess communication; Performance analysis; Shadow mapping; System performance; Throughput;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Spring. IEEE VTS 53rd
Conference_Location :
Rhodes
Print_ISBN :
0-7803-6728-6
DOI :
10.1109/VETECS.2001.944529
