  LoLa is a novel multi-path system for video conferencing applications over
cellular networks. It provides significant gains over single link solutions
when the link quality over different cellular networks fluctuate dramatically
and independently over time, or when aggregating the throughput across
different cellular links improves the perceived video quality. LoLa achieves
this by continuously estimating the quality of available cellular links to
decide how to strip video packets across them without inducing delays or packet
drops. It is also tightly coupled with state-of-the-art video codec to
dynamically adapt video frame size to respond quickly to changing network
conditions. Using multiple traces collected over 4 different cellular operators
in a large metropolitan city, we demonstrate that LoLa provides significant
gains in terms of throughput and delays compared to state-of-the-art real-time
video conferencing solution.
