Health Diagnosis and Congestion Mitigation of WiFi Networks - PowerPoint PPT Presentation

Health Diagnosis and Congestion Mitigation of WiFi Networks Mukulika Maity Prof. Bhaskaran Raman & Prof. Mythili Vutukuru Mukulika Maity Health Diagnosis and Congestion Mitigation of WiFi Networks

Real-life WiFi Deployment AP Microwave Oven TCP Downloads Interfering AP Interference Poor Clients Coverage Mukulika Maity Health Diagnosis and Congestion Mitigation of WiFi Networks

Congestion Mitigation: WiFiRR AP MAC Queue G 3 G 2 G 1 . . . K G 3 G 2 G 1 Slot 1 Slot 2 T Slot 3 Improvement WiFiRR improves TCP download performance by 3 . 5 × . Mukulika Maity Health Diagnosis and Congestion Mitigation of WiFi Networks

Health Diagnosis: Witals Low level of Low RSSI aggregation (LowAggr) Rate adadptation A. Low offered load A Poor Downlink C. Inefficient utilization confuses non channel loss Low (LowLoad) Performance of provided airtime (e.g. collision) for bitrate channel loss (RA) 6 5 Wired or DCF collision High client issuesTCP slowdown B. Not enough airtime for AP loss rate Client side Client hardware or issues system bottleneck Non WiFi 4 interference Other Client hidden near client MAC BSS Ctl, mgt Wasted unfairness Upload Overcrowding overheads non decodable 1 (CtlMgtOvhd) energy 3 Co channel Slow talker Hidden Non WiFi interference terminal device (CoChInterf) 2 Mukulika Maity Health Diagnosis and Congestion Mitigation of WiFi Networks

Health Diagnosis: Witals Output of diagnosis algorithm in a real-life scenario Healthy Lowload NonWiFi CoChInterf CtlMgtOvhd OtherBssOvhd OtherBssData Upload SlowT alker Overcrowding LowRSSI RA LowAggr AggrThpt(Mbps) 0.5 0.2 0.0 0 60 120 180 240 300 Time(s) Mukulika Maity Health Diagnosis and Congestion Mitigation of WiFi Networks