A new AMC scheme for QoS provisioning in cdma2000 1xEV-DV networks

摘要

cdma2000 1xEV-DV has been proposed as one of the standards for the next generation multimedia wireless generation (MWG) systems, which adopts new techniques such as adaptive modulation and coding (AMC) schemes to enhance wireless data services. Although many possible combinations of system parameters have been specified in the current 1xEV-DV standard, there is no further specification on how to dynamically choose the optimal combination of system parameters, such as the number of Walsh codes, the number of time slots, the modulation scheme, and the channel data rate, according to variations of buffer usage and channel quality. In this paper, we first review the latest cdma2000 1xEV-DV standard focusing on its unique features. Then, we propose a new delay-bounded dynamic resource allocation scheme for the QoS provisioning in cdma2000 1xEV-DV networks. The proposed scheme supports dynamic resource allocation by selecting the optimal combination of system parameters to satisfy the QoS requirements imposed by user applications, based on not only the channel quality but also the queue length. Simulation results show the proposed resource allocation scheme can provide delay-bounded services to multimedia applications such as voice and video.