  Multipath QUIC is a transport protocol that allows for the use of multiple
network interfaces for a single connection. It thereby offers, on the one hand,
the possibility to gather a higher throughput, while, on the other hand,
multiple paths can also be used to transmit data redundantly. Selective
redundancy combines these two applications and thereby offers the potential to
transmit time-critical data. This paper considers scenarios where data with
real-time requirements are transmitted redundantly while at the same time,
non-critical data should make use of the aggregated throughput. A new model
called congestion window reservation is proposed, which enables an immediate
transmission of time-critical data. The performance of this method and its
combination with selective redundancy is evaluated using emulab with real data.
The results show that this technique leads to a smaller end-to-end latency and
reliability for periodically generated priority data.
