KTH. Performance Analysis of Wireless LAN Access Points. Department of Microelectronics and Information Technology (IMIT). Royal Institute of Technology (KTH), Stockholm, Sweden. Licentiate Seminar Candidate: Iyad Al Khatib First Advisor: Prof. Rassul Ayani
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Performance Analysis of Wireless LAN Access Points
Department of Microelectronics and Information Technology (IMIT)
Royal Institute of Technology (KTH), Stockholm, Sweden
Candidate: Iyad Al Khatib
First Advisor: Prof. Rassul Ayani
Second Advisor: Prof. Gerald Q. Maguire Jr.
Opponent: Prof. George Liu, Linköping University, Sweden
May 27, 2003
2. Access Point (AP) Modeling
3. Experimental Setup
4. Test Design
5. Results (Queuing Model)
6. AP as a Data Link
7. Feedback Model for AP Throughput
9. Open Issues and Future Work
A system is “a group of devices or artificial objects or an organization forming a network especially for distributing something or serving a common purpose.”
Ta = Arrival time
Td = Departure time
Response time (R.T.) = Td - Ta
Si = Service time of packet i
Wi =Waiting time of packet i
Si and Wi calculated using our algorithms.
Si and Wi calculated using our special algorithms.
2. AP Modeling2.1. AP Queuing System
The testbed consists of Ethernet PCs (EPCs), WLAN PCs (WPCs), WLAN AP, and a Sniffer PC (SPC).
4. Tests Design4.1. The Link Scenario
(WPC or AP)
50μs for DIFS, ~4μs preamble, MAC header and trailer in DATA
10μs for SIFS, ~5μs link layer ACK period
AP2 (Lucent AP2000) Average Service Time (microsec)
5. Results (Queuing Model)5.1. Directional Service-Time Delay
UDC(,x) = |UST(,x)-DST(,x)|
5.3. Analysis of Directional Service-Time5.3.2. Convergent UDC plot
The packet pair property.
Mbps, for IPv4
Thanks to my advisors, Prof. Rassul Ayani and Prof. Gerald Q. Maguire Jr.
Also to Daimler Sweden AB for supporting us with WLAN APs, and for their interest.
..and to all, who helped.
Page 90, Section 6.3, Beginning of paragraph should be Figure 29
..and have a bright day!