Experiences with a Centralized Scheduling Approach for Performance Management of IEEE 802.11 Wireless LANs
The authors present a centralized integrated approach for enhancing the performance of an IEEE 802.11 infrastructure WLAN and for managing the access link that connects the WLAN to the Internet. Their approach, which is implemented on a standard Linux platform and which they call ADWISER (ADvanced Wi-Fi Internet Service EnhanceR), is an extension of their previous system WM (WLAN Manager,). ADWISER addresses several infrastructure WLAN performance anomalies such as mixed-rate inefficiency, unfair medium sharing between simultaneous TCP uploads and downloads and inefficient utilization of the Internet access bandwidth when Internet transfers compete with LAN-WLAN transfers, etc. The approach is via centralized queuing and scheduling, using a novel, configurable, cascaded packet queuing and scheduling architecture, with an adaptive service rate.