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Uplink Power Control in QoS-aware Multi-Service CDMA Wireless Networks

Eirini Eleni Tsiropoulou , Timotheos Kastrinogiannis , and Symeon Papavassiliou
Institute of Communication and Computer Systems (ICCS)
School of Electrical and Computer Engineering, National Technical University of Athens, Athens 15780

Abstract— In this paper the problem of QoS-driven power control in the uplink of CDMA wireless networks supporting multiple services is considered. Due to the need for supporting simultaneously various services with diverse QoS requirements, each user is associated with a nested utility function which appropriately represents his degree of satisfaction in relation to the expected tradeoff between his QoS-aware actual uplink throughput performance and the corresponding power consumption. Based on this framework, the problem is formulated as a non-convex noncooperative Multi-Service Uplink Power Control (MSUPC) game where users aim selfishly at maximizing their utilitybased performance under the imposed physical limitations. We first prove the existence and uniqueness of a Nash equilibrium point of the MSUPC game, and then a decentralized iterative algorithm to obtain MSUPC game’s equilibrium point is introduced. Finally, through modeling and simulation, the operation and features of the proposed framework and the decentralized MSUPC algorithm are evaluated with respect to the fulfillment of assorted services’ QoS requirements, while numerical results and relevant discussions that demonstrate the tradeoffs among users’ channel conditions, corresponding power consumption and utility-based performance are presented.

Index Terms— CDMA networks, power control, QoS, resource allocation, multimedia services.

Cite:Eirini Eleni Tsiropoulou, Timotheos Kastrinogiannis, and Symeon Papavassiliou, "Uplink Power Control in QoS-aware Multi-Service CDMA Wireless Networks ," Journal of Communications, vol. 4, no.9, pp.654-668, 2009. Doi: 10.4304/jcm.4.9.654-668