Adaptive joint source and channel coding scheme for H.264 video multicasting over wireless networks

摘要

An invention is described including calculating a real packet loss rate in a time slot at the end of the time slot, estimating average packet loss rate for a subsequent time slot, estimating variance of packet loss rate for the subsequent time slot and estimating the packet loss rate for the subsequent time slot. An invention is also described for dynamically allocating available bandwidth for video multicast including selecting an intra-frame rate, determining a packet loss rate threshold, receiving user topology information, receiving channel conditions for each user, determining an optimal operation point for encoding and transmitting video frames in a subsequent time slot, adapting dynamically quantization parameters and a forward error correction code rate, encoding the video frames using the quantization parameters and applying forward error correction code with the forward error correction code rate to data packets of the video frames to generate forward error correction packets.

主权项

1. A method for dynamically allocating available bandwidth in a wireless network for video multicast, said method comprising:
selecting an intra-frame rate; determining a packet loss rate threshold based on a desired serving area; receiving user topology information; receiving channel conditions for each receiver; determining target bit rate for encoding and transmitting video frames in a subsequent time slot; adapting quantization parameters and a forward error correction code rate based on said received channel conditions and said received user topology information, wherein said receivers having a packet loss rate greater than said packet loss rate threshold are ignored; encoding said video frames based on said quantization parameters and said intra-frame rate, wherein said quantization parameters and said forward error correction code rate are based on a target bit rate; and applying forward error correction code with said forward error correction code rate to data packets of said video frames to generate forward error correction packets.