Department of Communications Engineering

Test Bench Development for IEEE

802.11-based WLAN Performance

Evaluation and Measurements

Vitaly Petrov, MSc student

Department of Communications Engineering

Tampere University of Technology

Department of Communications Engineering

Problem topicality

2IEEE 802.11-based WLAN Performance Evaluation

802.11 (Wi-Fi) – de-facto standard for WLAN

Need for real performance evaluation

0

100

200

300

400

500

Generation

Declared

Achievable

Throughput, Mbit/s

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Mess of approaches

3IEEE 802.11-based WLAN Performance Evaluation

Measurements

SimulationAnalysis

Harmonization is required

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General use case

4IEEE 802.11-based WLAN Performance Evaluation

Nodes types:

1.Sender

2.Receiver

3.Sender /

Receiver

Infrastructure mode:

1. Widely used

2. Consequentive,

successful

implementations

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Harmonization is proposed

5IEEE 802.11-based WLAN Performance Evaluation

Measurements

Simulation

Analysis

Model

convergence

Best

practices

consideration

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Measurements

IEEE 802.11-based WLAN Performance Evaluation

Metrics:

1. Throughput

2. Packet Error

Trace (PET)

3. Average Delay

4. …

6

Open-source driver is required

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Simulation

7IEEE 802.11-based WLAN Performance Evaluation

Non-analytical models verification

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Analysis. Assumptions

8IEEE 802.11-based WLAN Performance Evaluation

Nodes number - const

Saturation

Every node has a packet ready to

transmit

Transmitting buffer is full

Data is sent by portions

Transmitting power – const

Rate – const

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Analysis.

Performance benchmarking

9IEEE 802.11-based WLAN Performance Evaluation

][32

)/(8)(1

maxmin iAIFSACKDATACTSRTSDIFSSLOTWW

bytebitsMbyteT

Extrapolation approaches

for N nodes exist

Throughput estimation for 2 nodes:

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Analysis. Channel models

10IEEE 802.11-based WLAN Performance Evaluation

Packet Error Trace Gilbert Elliott model

Pg Pb

10001010101101011

00010101010101010

10101000101010101

01110101011010010

000001010101010…

bbgb

bggg

pp

ppP

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Test bench structure

11IEEE 802.11-based WLAN Performance Evaluation

Metrics:

• Throughput

• QoS policy

• RTS/CTS Threshold

• Packet Error Trace

• Rate

• Error probability

• …

Benchmarking loop

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Different network scenarios

12IEEE 802.11-based WLAN Performance Evaluation

Modes:

802.11 g

802.11 n

802.11 ac

802.11 ad

1.

2.

3.

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Conclusions

13IEEE 802.11-based WLAN Performance Evaluation

Approaches harmonization

Performance benchmarking:

Measurements

Simulation

Analysis

Performance assessment

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Thank youWe are open for collaboration!

Thank you!

14IEEE 802.11-based WLAN Performance Evaluation