Tradeoff analysis of throughput and fairness on CDMA packet downlinks with location-dependent QoS

This work presents the quantitative tradeoff relation between system throughput and fairness on multirate code-division multiple-access (CDMA) downlinks. We develop and use an analytical model and a method for performance evaluation. The proposed model and method reflect the effects of multiplexing scheme, a limited data-rate set, log-normal shadowing, the best base station selection, and self-interference. System performance measures include asymptotic throughput, fairness performance factors, and outage probability . The performance of packet channels for delay-tolerant service is evaluated based on 3GPP wide-band code-division multiple-access (WCDMA) system model. Using the method developed, various algorithms for time resource assignment are applied and the system performance measures are derived and compared. We have derived the tradeoff between asymptotic throughput and fairness performance factors caused by the location-dependent carrier-to-interference ratio. The results show that we can control the tradeoff by applying various time resource-assignment schemes. It is also shown that the tradeoff in the system with the limited data-rate set can be improved by setting the number of simultaneous users properly.

[1]  Matthew S. Grob,et al.  CDMA/HDR: a bandwidth-efficient high-speed wireless data service for nomadic users , 2000, IEEE Commun. Mag..

[2]  E. Zehavi,et al.  Soft handoff extends CDMA cell coverage and increases reverse link capacity , 1994, IEEE J. Sel. Areas Commun..

[3]  John G. Proakis,et al.  Probability, random variables and stochastic processes , 1985, IEEE Trans. Acoust. Speech Signal Process..

[4]  Antti Toskala,et al.  Wcdma for Umts , 2002 .

[5]  Daehyoung Hong,et al.  Statistical model of downlink interference for the performance evaluation of CDMA systems , 2002, IEEE Communications Letters.

[6]  Xavier Lagrange,et al.  Radio resource management for packet transmission in UMTS WCDMA system , 1999, Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324).

[7]  Oriol Sallent,et al.  Radio Resource Management Strategies in UMTS , 2005 .

[8]  J. Wigard,et al.  Downlink radio resource management for IP packet services in UMTS , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[9]  Daehyoung Hong,et al.  Throughput comparison of CDM and TDM for downlink packet transmission in CDMA systems with a limited data rate set , 2004, IEEE Transactions on Wireless Communications.

[10]  Erik Dahlman,et al.  Wide-band services in a DS-CDMA based FPLMTS system , 1996, Proceedings of Vehicular Technology Conference - VTC.

[11]  Jack M. Holtzman,et al.  Asymptotic analysis of proportional fair algorithm , 2001, 12th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications. PIMRC 2001. Proceedings (Cat. No.01TH8598).

[12]  Kamyar Rohani,et al.  QoS and fairness for CDMA packet data , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[13]  Eric Miller,et al.  A simple analysis of CDMA soft handoff gain and its effect on the cell's coverage area , 1996 .

[14]  Matti Latva-aho.  Bit error probability analysis for FRAMES WCDMA downlink receivers , 1998 .

[15]  Kamyar Rohani,et al.  Spectral efficiency estimates for cdma2000-a third generation cellular standard , 1999, 1999 IEEE 49th Vehicular Technology Conference (Cat. No.99CH36363).

[16]  Sarvar Patel,et al.  Downlink scheduling in CDMA data networks , 2000, MobiCom '00.

[17]  Marina Ruggieri,et al.  Outage analysis in mobile radio systems with generically correlated log-normal interferers , 2000, IEEE Trans. Commun..

[18]  Michele Zorzi.  On the analytical computation of the interference statistics with applications to the performance evaluation of mobile radio systems , 1997, IEEE Trans. Commun..

[19]  Songwu Lu,et al.  Fair queuing in wireless networks: issues and approaches , 1999, IEEE Wirel. Commun..