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An efficient radio resource allocation scheme is crucial for guaranteeing the quality of service (QoS) requirements and fully utilizing the scarce radio resources in wireless multimedia networks. Most of previous work of radio resource allocation in traditional wireless networks concentrates on network layer connection blocking probability QoS. In this paper, we show that physical layer techniques and QoS have significant impacts on network layer QoS. We use a concept of cross-layer effective bandwidth to measure the unified radio resource usage taking into account both physical layer receivers and network layer traffic in code devision multiple access (CDMA) networks. Based on this concept, we can use rich theories developed in traditional wireless mobile networks for packet multimedia wireless networks. Moreover, since both physical layer QoS and network layer QoS are considered simultaneously, we can explore the tradeoff between physical layer QoS and network layer QoS in packet multimedia wireless networks.