RTP Circuit Breaker: An Evaluation of RTP Circuit Breaker Performance on LTE Networks
15 February 2014
/ cc
Our paper on
An
Evaluation of RTP Circuit Breaker Performance on LTE Networks
will be presented in the IEEE Infocom Workshop on Communication
and Networking Techniques for Contemporary Video in Toronto, Canada,
in April 2014.
Real-time multimedia comprises a large, and growing,
fraction of mobile data traffic. An important subset of such flows are
from interactive conferencing applications using RTP on UDP/IP to
reduce latency. UDP has no congestion control, and while the IETF is
developing RTP-level congestion control algorithms as part of the
WebRTC standards, these will take time to finalise and deploy. In the
interim,
we proposed an RTP circuit breaker to the IETF. This can
detect and stop RTP flows that cause excessive network congestion,
acting as an envelope within which a congestion control algorithm can
operate. In this paper, we review the circuit breaker design, and present an initial
performance evaluation on LTE networks. The algorithm is shown to be
conservative in overload situations with low delay and high loss, which
can occur due to AQM in LTE networks. We propose changes to the circuit
breaker to better suit such networks.