Probabilistic congestion control for non-adaptable flows
NOSSDAV '02 Proceedings of the 12th international workshop on Network and operating systems support for digital audio and video
Service Diffusion Strategies for Push to Talk over Cellular
ICMB '05 Proceedings of the International Conference on Mobile Business
The effect of packet dispersion on voice applications in IP networks
IEEE/ACM Transactions on Networking (TON)
ISM '08 Proceedings of the 2008 Tenth IEEE International Symposium on Multimedia
Performance of VoIP with DCCP for satellite links
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Push-to-Talk Service for Intelligent Transportation Systems
IEEE Transactions on Intelligent Transportation Systems
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IP telephony suffers from the well-known fact that the Internet does only provide a best-effort service. Thus, minimum transmission quality cannot be guaranteed and, especially during times of network congestion or occasional link failures, UDP-based VoIP becomes unusable. To overcome these limitations, we have developed a rate-adaptive transmission system for highly scalable speech and audio codecs that uses the Delay Tolerant Networking (DTN) approach for very low bit rates. In this way, as soon as the available transmission capacity falls below the minimum coding rate, our system switches to a Push-To-Talk (PTT) like conversational mode. Subjective conversational quality tests have shown that the algorithm allows for a good and effective conversation (MOS-CQS is 3.5) even in cases where traditional UDP based VoIP telephony fails (MOS-CQS is 1).