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Robust SuperPoll Protocol for IEEE 802.11 Wireless LANs By Aura - - PowerPoint PPT Presentation
Robust SuperPoll Protocol for IEEE 802.11 Wireless LANs By Aura - - PowerPoint PPT Presentation
Robust SuperPoll Protocol for IEEE 802.11 Wireless LANs By Aura Ganz*, Anan Phonphoem*, and Zvi Ganz** * ECE Department, University of Massachusetts, Amherst ** AIM Engineering Inc. 1 Presentation Outline IEEE 802.11 PCF Single
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IEEE 802.11 Point Coordination Function (PCF)
B PCF DCF CFP Repetition Interval CFP CP B PCF DCF CFP Repetition Interval CFP CP
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Single Polling
PTS X PTS X Data Data Ack Ack PTS Y Data Data Ack Ack PTS Y X Y Z AB
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Single Polling in Noisy Environment
X AB Y Z
Time
PTS(X) PTS(Y) PTS(Z) Data(X)
timeout
Data(Z)
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Proposed solution:
SuperPoll with Chaining Approach
sPTS X,Y,Z sPTS X,Y,Z sPTS X,Y,Z sPTS X,Y,Z AB X Z Y 1st 2nd 3rd Data Data Ack Ack
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SuperPoll with Chaining
n 1 2 3
AB
1 2 3 n
Chance to hear sPTS
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SuperPoll with Chaining
sPTS X,Y,Z sPTS X,Y,Z sPTS X,Y,Z sPTS X,Y,Z AB X Z 1st 2nd 3rd Ack Ack Data XYZ Y Data XYZ Data XYZ 2nd 3rd
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0.0 0.1 0.2 0.3 0.4 0.5 0.6 1 2 3 4 5 6 7 8 9 10 11 12 Group size
Average Probability (P*)
P = 0.5 P = 0.125
Average Probability that a station will not receive the SuperPoll
P = 0.5 P = 0.3 P = 0.1
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10 0.00 10.00 20.00 30.00 40.00 50.00 1 2 3 4 5 6 7 8 9 10 11 12
Group size % Gain
P = 0.3 P = 0.1 P = 0.5
Efficiency Gain
- f SuperPoll over Single Poll
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