Energy efficient video telephony over UMTS

A novel joint unequal error protection (UEP) and unequal power allocation (UPA) algorithm is proposed. UEP is performed through multiple radio bearers with different error correction capabilities. The perceived video quality is estimated based on the distortion calculation at the encoder. The transmission power on each bearer is controlled to maximize the expected perceived video quality for a given operating condition. The algorithm's performance is evaluated for MPEG-4 coded video transmission over a simulated UMTS network. Simulation results show that the joint UEP and UPA scheme is more energy efficient than applying them individually.