Transmission Error Detector is a cross-layer kernel mechanism that provides applications information about the successful (unsuccessful) UDP datagram transmissions through a given wireless access point. Transmission Error Detector is a core module component of a distributed architecture called ABPS (Always Best Packet Switching).
http://www.cs.unibo.it/~ghini/didattica/sistdistrib/ABPS_VoIP_JSS.pdf
http://www.cs.unibo.it/~ghini/accepted/Ghini_JCM17.pdf
http://amslaurea.unibo.it/8982/1/dibernardo_gabriele_tesi.pdf (Italian only)
http://www.slideshare.net/GabrieleDiBernardo1/transmission-error-detector-per-wifi-su-kernel-linux-40 (Italian only)