Color-aware power and rate adaptation in IP-based CDMA radio access networks
With IP technology being in the epicenter of future wireless networks, IP-centric resource management is currently receiving an increasing research attention. In this paper, a power and rate adaptation semantic is proposed that integrates quality of service (QoS) information from the IP layer of the differentiated services (DiffServ) architecture together with lower layer criteria in order to optimize packet transmission over the wireless interface. An optimization problem is formulated based on the output of a time sliding window three color marker (TSWtcm) of the ingress DiffServ node in the radio access network (RAN), where color aware power and rate control are performed. The critical impetus of the proposed approach besides minimization of the transmitted power is mainly twofold. Firstly, to achieve the required per-class aggregate data rate, while prioritizing and ensuring QoS of inprofile packets and secondly, to increase aggregate power gains by penalizing out-of-profile packets. The seminal aspect of the proposed scheme is that tangible power gains can be achieved by differentiating transmission of conformant and non-conformant packets while at the same time the power gains within each AF classes can be utilized to enhance the performance of in-profile traffic. To buttress the case, both theoretical and simulation results are meticulously presented that depict architectural and performance related aspects of the proposed scheme. Copyright (c) 2005 John Wiley & Sons, Ltd.
power and rate adaptation cdma diffserv packet-drop precedence