Robust SuperPoll Protocol for IEEE 802.11 Wireless LANs By Aura - - PowerPoint PPT Presentation

robust superpoll protocol for ieee 802 11 wireless lans
SMART_READER_LITE
LIVE PREVIEW

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


slide-1
SLIDE 1

1

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.

slide-2
SLIDE 2

2

Presentation Outline

■ IEEE 802.11 PCF ■ Single Polling Concept in Noisy

Environments

■ Proposed SuperPoll with Chaining

Approach

■ Performance Results ■ Summary

slide-3
SLIDE 3

3

IEEE 802.11 Point Coordination Function (PCF)

B PCF DCF CFP Repetition Interval CFP CP B PCF DCF CFP Repetition Interval CFP CP

slide-4
SLIDE 4

4

Single Polling

PTS X PTS X Data Data Ack Ack PTS Y Data Data Ack Ack PTS Y X Y Z AB

slide-5
SLIDE 5

5

Single Polling in Noisy Environment

X AB Y Z

Time

PTS(X) PTS(Y) PTS(Z) Data(X)

timeout

Data(Z)

slide-6
SLIDE 6

6

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

slide-7
SLIDE 7

7

SuperPoll with Chaining

n 1 2 3

AB

1 2 3 n

Chance to hear sPTS

slide-8
SLIDE 8

8

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

slide-9
SLIDE 9

9

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

slide-10
SLIDE 10

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
slide-11
SLIDE 11

11

Summary

■ SuperPoll is very robust and efficient in

noisy environment

■ Group size can be adjusted according to

station’s environment (location, etc.)

■ Easy integration within IEEE802.11 ■ SuperPoll algorithm is more complex than

single poll