Resource allocation with adaptive QoS for multimedia transmission over W-CDMA channels
This paper addresses the important issues of resource allocation and rate adaptation for multiple media, such as audio, video, email, and Web traffic, transmitted over W-CDMA (wideband code division multiple access) channel with adaptive QoS (quality of service) support. In order to have QoS support for different types of media, we develop an architecture combining the link layer with application layer controls. It consists of the following contributions: (1) an appropriate model to estimate the varying fading channel is proposed; (2) a hybrid delay-constrained ARQ (automatic repeat request) and UEP (unequal error protection) mechanism that dynamically adapt to the time-varying channel is presented to meet the QoS requirements for different applications; (3) a new resource allocation scheme that considers varying media characteristics is described to be adapted to changing bit error rate (BER) conditions. Simulation results demonstrate the effectiveness of our proposed scheme.