An ARQ Retransmission Scheme for Multicasting Real-Time Video Streams over Mobile Communication Networks

This paper presents an ARQ (Automatic Repeated reQuest) blocks retransmission (ABR) for video multicasting over a mobile communication network (MCN). Multicast is an effective mechanism to save network bandwidth while transmitting a video stream. Yet, packet errors occur very easily in the last hop between a base station (BS) and a mobile station (MS) because of interferences and noises in the wireless channels. Large packet errors could bring a vital deterioration to the quality of video multicasting. The proposed ABR scheme considers three factors: (i) a percentage of a block in error among MS, (ii) the time constraint of a video frame, and (iii) the extra bandwidth for retransmitting the erroneous blocks. NS-3 simulation is performed to evaluate the proposed ABR. Simulation results demonstrate that a high quality of a multicast video can be reconstructed by using the ABR. Additionally, extra bandwidth for retransmitting the erroneous blocks is kept in a minimum.

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