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In this paper, we propose a novel cross-layer decoder design that efficiently recovers more video data in the presence of transmission errors for 3G-324M video telephony over WCDMA networks. The proposed method requires collaboration of the video decoder and multiplexing protocol. In particular, it considers loss characteristics of WCDMA channels and modifies demultiplexer to provide additional information to assist video decoder to locate the error position. Then, the video decoder performs error concealment only on the lost macroblocks (MBs), instead of all the MBs in a video slice. The simulation results show that the proposed method can reduce the number of concealed MBs by 22-27% and improve video quality by 0.3-0.7 dB, depending on the video contents and block error rates.