May 2003 Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 1 doc.: IEEE 802.11- 03/567r0 Submiss ion Throughput Enhancement Throughput Enhancement via Frame Aggregation – via Frame Aggregation – A Sequel A Sequel Youngsoo Kim *+ , Sunghyun Choi * , Hyosun Hwang + , and Kyunghun Jang + + Samsung Advance Institute of Technology (SAIT ) and * Seoul National University (SNU)
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Doc.: IEEE 802.11-03/567r0 Submission May 2003 Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 1 Throughput Enhancement via Frame Aggregation – A Sequel.
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May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 1
doc.: IEEE 802.11-03/567r0
Submission
Throughput Enhancement Throughput Enhancement via Frame Aggregation – A Sequelvia Frame Aggregation – A Sequel
Youngsoo Kim*+, Sunghyun Choi*,
Hyosun Hwang+, and Kyunghun Jang+
+Samsung Advance Institute of Technology (SAIT) and *Seoul National University (SNU)
May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 2
doc.: IEEE 802.11-03/567r0
Submission
ContentsContents
• Introduction
• Frame aggregation
• New Results– Numerical throughput analysis with channel
error
– Performance measurement using TCP and UDP traffic
• Conclusion
May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 3
doc.: IEEE 802.11-03/567r0
Submission
IntroductionIntroduction
• Objective– To achieve high throughput/efficient schemes to
improve the current 802.11 MAC
• Background– 802.11 MAC/PHY has fixed overheads irrespective of
packet size
– The small-size packet can cause more throughput degradation
– To reduce the overheads is the one of main concerns to enhance current 802.11 WLAN
May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 4
• Path loss exponent = 4 & Tx_power = 200 mW– Based on error performance analysis assuming
• Binary convolutional coding • Hard-decision Viterbi decoding with AWGN at the input
May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 9
doc.: IEEE 802.11-03/567r0
Submission
Numerical Analysis ResultNumerical Analysis Result
May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 10
doc.: IEEE 802.11-03/567r0
Submission
Some Lessons from Error PerformanceSome Lessons from Error Performance
Short distance (high Tx rate)
Long distance(low Tx rate)
Throughput gain
High Low
Error performance loss
Low High
• Frame aggregation seems a good solution to improve throughput when the distance between sender and receiver is relatively short !
May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 11
doc.: IEEE 802.11-03/567r0
Submission
Performance MeasurementPerformance Measurement• Implement frame aggregation in real platform• Linux & Intersil-based platform (11b)• Measure the throughput performance of UDP
and TCP traffic• Note: Frame aggregation is only applied when
there are multiple frames in the queue
Traffic generator AP STA
May 2003
Youngsoo Kim, Samsung/SNU and S. Choi, SNU Slide 12
doc.: IEEE 802.11-03/567r0
Submission
New Measurement Results - UDPNew Measurement Results - UDP