Rate and power control on a reverse link for multi-cell mobile data networks

摘要

Rate and power control are extremely important in determining the quality of service and radio resource utilization in mobile data networks. In the literature, the rate is assigned such that the system throughput is maximized and the transmit power at the mobile station (MS) is controlled in order to maintain a signal to interference ratio (SIR) that can provide a 1% frame error rate at the base station (BS). When the objective of radio resource allocation is the maximization of the system throughput, all MSs do not obtain the same rates. The current CDMA standard (cdma2000-1x-EV-DO) employs rate control in a probabilistic way. The rate assignment may not result in maximizing the system throughput and the interference at the BS may exceed the allowable levels. Power control based on a fixed target SIR that was suitable for voice cellular networks is still used in the emerging mobile data networks in spite of the different requirements of voice and data MSs. In this work, we propose new approachesof rate and power control that can provide high throughput and completely utilize the radio resources while overcoming these drawbacks. The proposed schemes attempt to maximize the throughput of each MS while staying within the maximum allowable interference. Each MS gets the same transmission rate. Moreover, the scheme can be implemented in practice unlike other theoretical approaches. The proposed scheme shows better throughput and radio resource utilization than the traditional schemes of 1x-EV-DO systems.