Downlink joint rate and power allocation in cellular multirate WCDMA systems

TitleDownlink joint rate and power allocation in cellular multirate WCDMA systems
Publication TypeJournal Article
Year of Publication2003
AuthorsKim, D. I., E. Hossain, and V. K. Bhargava
JournalWireless Communications, IEEE Transactions on
Pagination69 - 80
Date Publishedjan.
Keywords3G communication system, base station transmitter, cellular multirate WCDMA systems, cellular radio, channel capacity, code division multiple access, computational complexity, constrained SIR, correlated long-term fading, directional micromobility models, downlink, downlink data transmission, dynamic joint rate control, exhaustive search, exponential time complexity, fading channels, homogeneous traffic load, joint power allocation, joint rate allocation, land mobile radio, linear time complexity, multicell variable spreading factor, multiuser channels, nonuniform traffic load, optimal dynamic link adaptation, optimal link adaptation, optimality criterion, power control, QoS, quality-of-service, radio link level frame transmission, radio link level throughput fairness, radio links, radiofrequency interference, random micromobility models, sum-rate capacity, telecommunication control, telecommunication traffic, throughput, total radio link level capacity, uncorrelated long-term fading, uniform traffic load, wideband code-division multiple-access

This paper proposes a novel dynamic joint rate and power control procedure for downlink data transmission in a multicell variable spreading factor wideband code-division multiple-access (WCDMA) system where the different users have similar quality-of-service requirements in terms of the signal-to-interference ratio (SIR). Two variations of the dynamic joint rate and power allocation procedure, namely, Algorithm-1 and Algorithm-2, are presented. The performances of these two schemes are compared to the performance of the optimal dynamic link adaptation for which the rate and power allocation is found by an exhaustive search. The optimality criterion is the maximization of the total radio link level capacity (or sum-rate capacity) in terms of the average number of radio link level frame transmitted per adaptation interval under constrained SIR and power limit in the base station transmitter. The proposed schemes have linear time complexity as compared to the exponential time complexity of the optimal scheme and achieve better radio link level throughput fairness compared to the optimal link adaptation scheme with a moderate loss in total throughput. Performance evaluation is carried out under random and directional micromobility models with uncorrelated and correlated long-term fading, respectively, in a cellular WCDMA environment for both the homogeneous (or uniform) and the nonhomogeneous (or nonuniform) traffic load scenarios.


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