In this paper. the effect of wireless internet traffic on the functionality of a radio resource metric estimation (RME) applicable to a TDD-CDMA system which incorporates a multirate transmission scheme (such as multicode and multislot) with simple call admission control algorithm is investigated. A solution for efficient inter-working between the physical layer and the higher layers is proposed, a resource metric mapping function (RMMF) that can deliver information about the state of the current channel load condition by the monitoring of signal-to-interference ratio (SIR) bursts and also the availability of a code pool by estimating the mean and the standard deviation of SIR bursts. This function is defined and demonstrated by means of an average raw BER mapping diagram as a function of the mean and the standard deviation of SIR bursts according to the multirate transmission method. By using this kind of mapping function combined with throughput estimation, the radio resource allocation algorithm can successfully reflect the current interference and mobile radio channel characteristics. Copyright (C) 2004 John Wiley Sons, Ltd.