PROJECT TITLE :

Less Transmissions, More Throughput: Bringing Carpool to Public WLANs

ABSTRACT:

A typical state of affairs for public WLANs is giant audience surroundings where Wi-Fi hotspots serve various mobile devices. The performance of these Wi-Fi hotspots is extremely poor in terms of low goodput and severe delay thanks to serious competition and MAC inefficiency. When fastidiously investigating the traffic patterns in public WLANs, we propose Carpool, a sensible design that facilitates transmission sharing among multiple receivers, to tackle this drawback. The key idea is to reduce competition by feeding frames for multiple destinations into one transmission at physical layer (PHY). As such, each downlink transmission carries payloads for multiple receivers, which reduces competition overhead and allows in-time response to concurrent requests from multiple users. To attain economical and reliable transmission in Carpool, we propose i) a light-weight frame structure to support multiple receivers, and ii) a real-time channel estimation scheme to continuously calibrate channel estimation throughout the transmission of a Carpool frame. We have a tendency to have implemented the complete PHY of Carpool on the GNURadio/USRP platform and tested it in varied indoor environments. Furthermore, our trace-driven MAC evaluation shows that Carpool achieves up to goodput gain and reduces up to % delay compared to the IEEE 802.11n MAC frame aggregation theme.