  In wireless networks, stations can improve their received quality of service
(QoS) by handling packets of source flows with higher priority. Additionally,
in cooperative relay networks, the relays can handle transit flows with lower
priority. We use game theory to model a two-hop relay network where each of the
two involved stations can commit such selfish QoS manipulation. We design and
evaluate a reputation-based incentive scheme called RISC2WIN, whereby a trusted
third party (e.g., an access point) can limit selfish behavior and preserve
appropriate QoS for both stations.
