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In this paper, we present a cooperative video multicast protocol for densely deployed small cells. We assume that the small cell Base Stations (BS) have overlapping coverages and they are allowed to have interfering transmissions. The proposed cooperative multicast protocol realizes a two-hop transmission system where each hop has its own time slot. In the first hop, the small cell base stations simultaneously...
In this article we present Meetecho Mobile, an innovative conferencing client designed for mobile devices. Such a client provides access to conferences compliant with the most recent standard proposals currently under definition within the IETF. It allows mobile users to participate in multimedia conferences involving, besides an XMPP-based chat, both audio and video streams. The article discusses...
This paper analyzes the reasons of asynchronous between audio and video image for current 3G video phones. A solution for improving the synchronization between audio and video data is proposed. The solution proposed in this work mainly consists of software components, according to which hardware needs to be selected. It also gives the video phone terminal structure, block diagram for H.324M video...
This paper presents a bandwidth-efficient method for improved decoding of critical data generated by the MPEG-4 AAC audio coder when encoded bitstreams are transmitted over noisy channels. The critical data of each encoded frame is estimated using the redundancy due to the correlation between successive frame headers and using an optional CRC as an error-correcting code. Simulation results for an...
To reduce signal overhead, we present a bitmap coding method which just codes changing bits between two continuous bitmaps sent by the same peer. Our method has a novel characteristic that the smaller the bitmap exchange interval is, the shorter the coded sequence is. The average compression ratio of our method is 13.46:1 for real bitmaps crawled from PPLive. For the same bitmap crawled from UUSee,...
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