Bluetooth test cases with 802 11n 40 mhz
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Bluetooth test cases with 802.11n 40 MHz. Authors:. Date: 2008-08-18. Abstract. Test setup and test procedures to determine impact of 802.11n 40MHz channel operation in 2.4 GHz spectrum on Bluetooth (IEEE 802.15.1) devices sharing the same 2.4 GHz spectrum. Goal.

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Bluetooth test cases with 802 11n 40 mhz l.jpg
Bluetooth test cases with 802.11n 40 MHz

Authors:

Date: 2008-08-18

John R. Barr, Motorola, Inc.


Abstract l.jpg
Abstract

Test setup and test procedures to determine impact of 802.11n 40MHz channel operation in 2.4 GHz spectrum on Bluetooth (IEEE 802.15.1) devices sharing the same 2.4 GHz spectrum.

John R. Barr, Motorola, Inc.


Slide3 l.jpg
Goal

  • Determine the impact of 40MHz 802.11n operation on other devices sharing 2.4 GHz spectrum.

    • Impact shall be measured as the difference in channel access seen by victim devices with and without 40 MHz 802.11n operation.

    • Impact of turning on 40 MHz 802.11n operation when victim devices are operating.

    • The reduction in user’s quality of experience attributed to 40 MHz 802.11n operation.

    • The impact shall be measured as:

      • amount of channel capacity removed for access by victim devices

      • packet error rates experienced

      • deterioration of application level quality

      • deterioration of victim network systems capabilities (e.g., device discovery).

John R. Barr, Motorola, Inc.


Test cases l.jpg
Test Cases

  • At least two use cases shall be included in the analysis:

    • Headset to mobile phone receiving a continuous 1K tone.

    • A2DP streaming of music from mobile phone to stereo headset.

  • The same headset and phone can be used for each test. For these tests measurement of channel availability, packet error rates, and application level quality will be measured first with the 802.11n signal generator turned off and then with the signal generator turned on generating signals with low, medium, and high duty cycles.

  • The Bluetooth link should be configured with and without AFH operation.

  • The mobile phone will be placed 2-3 meters away from the signal generator and the headset will be moved between them to measure potential impact.

  • The headset will be moved to within 2-4 feet of the signal generator as would be seen when user is using mobile phone with headset and working on a laptop using 802.11n WLAN access.

  • It will be necessary to move the headset far enough away from the mobile phone to realize typical 75 dB path loss associated with using headset while mobile phone is in your pocket. This can also be done by having user place mobile phone in pocket and wear headset during the test.

John R. Barr, Motorola, Inc.


Use case 1 l.jpg

Applications:

Voice call on a cell phone with a wireless Bluetooth headset - Calling 1KHz tone generator source to better identify interference.

WLAN connectivity via a laptop connected to an AP with 802.11 (can be simulated with Agilent E4438C along with N7617B WLAN signal studio)

802.11n traffice needs to vary from small to large packets with different repitition rates to analyze AFH impact.

Use Case

A user makes a phone call with a cell phone with Bluetooth headset

Same user simultaneously accesses a network with a laptop with 802.11n

Or, user in same room as another user accesses network with laptop using 802.11n

BT link

devices separated by 3m to model typical path loss between headset and cell phone or phone in pocket and headset on ear

Voice link (SCO)

802.11 link

STA separated from AP by 5 m or less (depending on size of test facility)

Bluetooth link separated from the 802.11 client STA by 0.5 m to model same individual using both BT and WLAN

Bluetooth link separated from 802.11n signal source by 2-0.5 m to model user in room with others using 802.11n

Bluetooth Link

802.11 Link

Interference

Use Case 1

OR

Frontline

Bluetooth

Sniffer

Agilent

Signal

Generator

OR

John R. Barr, Motorola, Inc.


Use case 2 l.jpg

Applications:

A2DP connection between phone and stereo headset

WLAN connectivity via a laptop connected to an AP with 802.11 (can be simulated with Agilent E4438C along with N7617B WLAN signal studio)

802.11n traffice needs to vary from small to large packets with different repitition rates to analyze AFH impact.

Use Case

A user is listening to stereo music using mobile phone as source and stereo headset as sink

Same user simultaneously accesses a network with a laptop with 802.11n

Or, user in same room as another user accesses network with laptop using 802.11n

BT link

devices separated by 3m to model typical path loss between headset and cell phone or phone in pocket and headset on ear

Voice link (SCO)

802.11 link

STA separated from AP by 5 m or less (depending on size of test facility)

Bluetooth link separated from the 802.11 client STA by 0.5 m to model same individual using both BT and WLAN

Bluetooth link separated from 802.11n signal source by 2-0.5 m to model user in room with others using 802.11n

Bluetooth Link

802.11 Link

Interference

Use Case 2

Frontline

Bluetooth

Sniffer

Agilent

Signal

Generator

OR

John R. Barr, Motorola, Inc.


Test parameters for use cases l.jpg

All wireless links over-the-air

Separation of BT devices: 3 m or worn on body to obtain typical 75 dB path loss

Separation of WLAN devices: 5m

Separation of BT and WLAN devices: 0.5 m, (and 3 m if necessary)

BT configuration:

SCO

eSCO (only if there was any degradation in SCO test)

AFH on & impact during adaption

AFH on & let it adapt

AFH off

WLAN configuration

Make note whether aggregation is on or off

11n 40 MHz,

Channel pair

6, 2

Offered load

Max Throughput

22 Mbps

1 Mbps

11n 20 MHz

Channel

6

Offered load

Max Throughput

22 Mbps

1 Mbps

11g

Channel

6

Offered load

Max Throughput

1 Mbps

Test Parameters for Use Cases

John R. Barr, Motorola, Inc.


Data collection l.jpg
Data Collection

  • Test details

    • Each iteration runs for 3 minutes:

      • Bluetooth operation without 802.11n signal

      • Continued Bluetooth operation after start of 802.11n signal

      • Steady state operation of Bluetooth and 802.11n (after AFH adaption)

    • Repeat each iteration 3 times (or 5 if time allows)

    • collect average results and standard error

    • Initially run BT link test with no WLAN link present for baseline

      • With Test 2, run both BT links as baseline

  • BT link data

    • Amount of 1 KHz tone lost for each step

    • Amount of stereo music dropouts

    • Bit/packet error rate

    • Number of Bluetooth channels removed by AFH

  • 802.11 data

    • Throughput

John R. Barr, Motorola, Inc.


Other test cases to be considered l.jpg
Other test cases to be considered

  • 802.11n signals may be switching from 20 to 40 MHz operation intermittently. Need test to measure impact on Bluetooth AFH operation.

  • Impact on Bluetooth discovery operation in presence of 40 MHz 802.11n signals.

  • Use of bi-directional tones (400 and 500 Hz) during headset tests

  • Impact on devices other than Bluetooth (e.g., IEEE 802.15.4, 15.6, etc.)

  • Impact on power consumption of Bluetooth devices due to 802.11n 40 MHz interference

John R. Barr, Motorola, Inc.


References l.jpg
References

  • https://mentor.ieee.org/802.11/file/08/11-08-0893-00-000n-40mhz-bt-measurements.ppt

  • https://mentor.ieee.org/802.19/file/08/19-08-0027-02-0000-ieee-802-11n-40-mhz-impact-on-bt-performance.ppt

John R. Barr, Motorola, Inc.


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