2 research outputs found
Joint Source-Channel Coding for Real-Time Video Transmission to Multi-homed Mobile Terminals
This study focuses on the mobile video delivery from a video server to a
multi-homed client with a network of heterogeneous wireless. Joint
Source-Channel Coding is effectively used to transmit video over
bandwidth-limited, noisy wireless networks. But most existing JSCC methods only
consider single path video transmission of the server and the client network.
The problem will become more complicated when consider multi-path video
transmission, because involving low-bandwidth, high-drop-rate or high-latency
wireless network will only reduce the video quality. To solve this critical
problem, we propose a novel Path Adaption JSCC (PA-JSCC) method that contain
below characters: (1) path adaption, and (2) dynamic rate allocation. We use
Exata to evaluate the performance of PA-JSCC and Experiment show that PA-JSCC
has a good results in terms of PSNR (Peak Signal-to-Noise Ratio).Comment: 5 pages. arXiv admin note: text overlap with arXiv:1406.7054 by other
author
A QoS Guarantee Strategy for Multimedia Conferencing based on Bayesian Networks
Service Oriented Architecture (SOA) is commonly employed in the design and
implementation of web service systems. The key technology to enable media
communications in the context of SOA is the Service Oriented Communication. To
exploit the advantage of SOA, we design and implement a web-based multimedia
conferencing system that provides users with a hybrid orchestration of web and
communication services. As the current SOA lacks effective QoS guarantee
solutions for multimedia services, the user satisfaction is greatly challenged
with QoS violations, e.g., low video PSNR (Peak Signal-to-Noise Ratio) and long
playback delay. Motivated by addressing the critical problem, we firstly employ
the Business Process Execution Language (BPEL) service engine for the hybrid
services orchestration and execution. Secondly, we propose a novel
context-aware approach to quantify and leverage the causal relationships
between QoS metrics and available contexts based on Bayesian networks (CABIN).
This approach includes three phases: (1) information discretization, (2) causal
relationship profiling, and (3) optimal context tuning. We implement CABIN in a
real-life multimedia conferencing system and compare its performance with
existing delay and throughput oriented schemes. Experimental results show that
CABIN outperforms the competing approaches in improving the video quality in
terms of PSNR. It also provides a one-stop shop controls both the web and
communication services.Comment: 9 page