Beyond the Bits: Cooperative Packet Recovery Using Physical Layer Information
Users increasingly depend on WLAN for business and entertainment. However, they occasionally experience dead spots and high loss rates. The authors show that these problems can be addressed by exposing information readily available at the physical layer. They introduce SOFT, a new architecture that makes the physical layer convey its confidence that a particular bit is "0" or "1" to the higher layers. Access points that hear the same transmission communicate their confidence values over the wired Ethernet and combine their information to correct faulty bits in a corrupted packet.