Sanjeev Mehrotra, Jin Li, and Ying-zong Huang
There is an ongoing explosion of interactive Internet
By nature, these applications require responsive client-server data exchange
and lossless, in-order delivery.
In previous work, we have shown that a hybrid FEC-ARQ protocol which
combines sending original data packets with forward error correction (FEC)
packets is effective in reducing the latency caused by retransmissions
of lost packets.
However, the prior scheme only sends FEC packets when there are no
original packets pending transmission.
In this paper, we further expand the investigation of the
hybrid FEC-ARQ protocol
and show that sometimes, the transmission latency can be further reduced by
preempting original data packets with FEC packets.
We have formulated the decision of whether to send
new original data packets, FEC packets, or resend original data packets
as a transmission policy.
An optimal transmission policy is selected to minimize the
delay experienced by the application subject to a constraint on
the amount of waste.
By using this optimal policy,
we significantly improve the delay performance over
straightforward FEC schemes while controlling the amount of waste due to FEC.
|Published in||Proceedings of ICME 2010|