Dynamic rate and power adaptation for provisioning class-based QoS in cellular multirate WCDMA systems
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Date
2004-09-30T13:00:04Z
Authors
Kim, DI
Hossain, E
Bhargava, VK
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Abstract
This paper addresses the problem of dynamic link adaptation under multiple quality-of-service (QoS) constraints in cellular wideband code-division multiple-access (WCDMA) systems. A novel dynamic joint rate and power adaptation framework is proposed for downlink data transmission in a multicell variable spreading factor (VSF) WCDMA system where the different classes of users have different signal-to-interference ratio (SIR) requirements. Based on a general downlink SIR model, the problem of optimal dynamic rate and power adaptation under multiple SIR constraints is also formulated, for which the rate and power allocation can be found by an exhaustive search. Two schemes, namely, near-optimal and suboptimal schemes, are proposed for implementation-friendly dynamic rate and power adaptation. Performance of dynamic joint rate and power adaptation under the proposed framework is evaluated under random micro-mobility model with uncorrelated long-term fading and a directional micro-mobility model with correlated long-term fading in a cellular WCDMA environment.
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Keywords
dynamic rate and power adaptation, multicell multirate wideband code-division multiple-access (WCDMA) systems, class-based quality of service (QoS), priority-based rate adaptation
Citation
1536-1276; IEEE TRANS WIREL COMMUN, SEP 2004, vol. 3, no. 5, p.1590 to 1601.