A Dynamic Utility Adaptation Framework for Efficient Multimedia Service Support in CDMA Wireless Networks

作者：Kastrinogiannis Timotheos; Papavassiliou Symeon^*

来源：EURASIP Journal on Wireless Communications and Networking, 2010, 375410.

DOI：10.1155/2010/375410

In this paper, the problem of channel-aware opportunistic resource allocation for the downlink in code division multiple access wireless networks supporting simultaneously real-time multimedia and non-real-time data services is addressed. In order to treat different types of services with diverse QoS prerequisites through common optimization formulation a utility-based power and rate allocation framework is adopted. Emphasis is placed on real-time services' strict short-term QoS prerequisites, the fulfillment of which requires a significantly more different treatment than the use of static utility functions, traditionally used to address long-term QoS or fairness prerequisites of delay-tolerant data services. To that end, we introduce a novel generic framework that enables the dynamic adaptation of real-time multimedia users' utilities as the system evolves, with respect to the corresponding short-term throughput service performance variations. The corresponding nonconvex network utility maximization (NUM) problem is then formulated and solved to obtain optimal downlink power and rate allocation. Via simulation and analysis, it is demonstrated that significant performance improvements are achieved in terms of real-time user's short-term throughput requirement satisfaction, without any considerable loss in the total system throughput. Finally, an essential tradeoff between efficiently fulfilling real-time services' short-term QoS prerequisites and maximizing overall system performance, under an opportunistic scheduling wireless environment, is revealed and quantified.

• 出版日期2010