Cross-Layer QoS for Wireless Video Based on Priority-ARQ

The communication of video streams over wireless not only requires the stability of channel but also needs stringent QoS (quality-of-service) constraints, such as low packet loss and latency. Therefore, radio resource allocation for different traffic becomes one of the major challenges in designing a wireless multimedia network. In this paper, a priority-based cross-layer QoS scheme for wireless channel and video applications by MPEG4 codecs is introduced. In addition, we propose an efficient strategy for the transmission of scalable video over NS2 wireless systems. The main procedure can be summarized as follows: when the application layer is working, unequal error protection is adapted for retransmission decision. ARQ algorithm will be executed according to the priority-based adaptive QoS of MPEG4 video streams when packet-loss occurs. After several simulations, the final results demonstrate that video processed in cross-layer scheme experiences much better than that of traditional scheme.