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Doc.: IEEE 802.11-08/1140r0 Submission 11n 40 MHz and BT coexistence test results Authors:

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Presentation on theme: "Doc.: IEEE 802.11-08/1140r0 Submission 11n 40 MHz and BT coexistence test results Authors:"— Presentation transcript:

1 doc.: IEEE 802.11-08/1140r0 Submission 11n 40 MHz and BT coexistence test results Authors:

2 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 2 Objective Measure performance impact on 802.11n and Bluetooth (BT) when 802.11n operates in 20 MHz and 40 MHz Measurements made in accordance to test scenarios specified in [1] and [2] Test Scenarios –BT Profiles: SCO, ACL and A2DP –802.11n: 20 MHz/40 MHz

3 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 3 Test Setup Anechoic shielded room used Separation of WLAN devices is 3m due to test facility constraints 11g performance not measured due to time constraints Laptop is the primary 802.11n transmitter 802.11n Setup –Throughput test using IxChariot –Aggregation ON and video priority used to maximize medium utilization

4 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 4 BT Adaptive Frequency Hopping (AFH) Definitions AFH off –All 79 MHz channels are used and none of the channels are blocked AFH on: Two types of AFH used –Manual AFH –Manually remove or blacklist channels that get affected by 802.11 and some margin at the edges. –For e.g. when using 40 MHz with 2, 6 channel, block all lower channels (except for first four) and enable all higher channels (top twenty seven) –Regular AFH Present results with both regular and manual AFH

5 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 5 Tests Outline Quantitative Test Setups –#1: SCO: Measure Mean Opinion Score (MOS) –#2: ACL: Measure BT throughput Qualitative Test Setups –#4: SCO –#5.1: A2DP: Distance between BT and 802.11n = 0.5 meters –#5.2: A2DP: Distance between BT and 802.11n = 0.5 meters –#5.3: A2DP: Distance between BT and 802.11n = 1.5 meters

6 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 6 Test Setup #1: BT SCO performance Refers to use-case 1 of [1] & [2]. Adjustments –22 Mbps data rate not measured due to time constraints Setup –Refer slide 3. –Bluetooth Setup SCO link: MOS measured using PESQ P.862 method AFH on: Manual AFH was used –The tester was standing between bluetooth devices

7 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 7 Test Setup #1: BT SCO performance No 802.11n throughput throttling Baseline (AFH off) 802.11n 20MHz (AFH off) 802.11n 40MHz (AFH off) Baseline (AFH on) 802.11n 20MHz (AFH on) 802.11n 40MHz (AFH on) BT MOS Average 3.62.11.74.24.1 802.11n Mbps Throughput 20 MHz: 98.4 40 MHz: 178.4 68.8135.14 20 MHz: 98.4 40 MHz: 178.4 94.7176 802.11n throughput: 1 Mbps Baseline (AFH off) 802.11n 20MHz (AFH off) 802.11n 40MHz (AFH off) Baseline (AFH on) 802.11n 20MHz (AFH on) 802.11n 40MHz (AFH on) BT MOS Average 3.63.5 4.2 4.1 802.11n Mbps Throughput 111111

8 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 8 Setup –Refer slide 3. –Bluetooth Setup ACL link: 10000 packets of length 160 bytes of type DH5 Maximum achievable throughput in this configuration is about 315 kbps BT performance: Measure throughput AFH on: Manual AFH was used Test Setup #2: ACL performance

9 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 9 Test Setup #2: ACL performance No 802.11n throughput throttling Baseline (AFH Off) 802.11n 20MHz (AFH off) 802.11n 40MHz (AFH off) Baseline (AFH on) 802.11n 20MHz (AFH on) 802.11n 40MHz (AFH on) BT Average (kbps) 30815947315312.2260.5 802.11 Average (Mbps) 20 MHz: 97.06 40 MHz: 175 6813220 MHz: 97.06 40 MHz: 175 98.7174.5 802.11n throughput 1 Mbps Baseline (AFH Off) 802.11n 20MHz (AFH off) 802.11n 40MHz (AFH off) Baseline (AFH on) 802.11n 20MHz (AFH on) 802.11n 40MHz (AFH on) BT Average (kbps) 308302301315314311 802.11 Average (Mbps) 1/111 11

10 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 10 Discussion: Quantitative Test Results 802.11n High medium utilization (No throughput throttling) –Without AFH, performance of BT degrades in the presence of 802.11n for both 20 and 40MHz MOS is not acceptable for both 20 MHz and 40 MHz 802.11n throughput also gets severely affected (down 30 %) –Manual AFH greatly improves the performance of BT in the presence of 802.11n for both 20 and 40MHz MOS is comparable for 20 MHz and 40 MHz 802.11n throughput has slight degradation 802.11n Low medium utilization (1 Mbps) –802.11n and BT performance are not degraded considerably (<10%)

11 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 11 Qualitative Tests Perception tests for audio quality of BT SCO and A2DP in presence of 802.11n 20 MHz and 40 MHz The data presented here is for reference only and it is not intended to be interpreted as comparing different implementations and their performance. Results are presented for limited number of scenarios Note –“blips”: minor interruption in audio of duration <2 second –“dropouts”: major interruption in audio of duration >= 2seconds

12 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 12 Test Setup #4: BT SCO – Qualitative Tests Equipment –Plantronics Voyager 855 headset and Marvell BT Setup similar to use-case 1 of [1] & [2]. Adjustments 22 Mbps data rate not measured due to time constraints AFH –Regular AFH

13 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 13 Test Setup #4: BT SCO – Qualitative Test Results AFH Disabled –802.11n: No throughput throttling 20 MHz: Audio is distorted but remains intelligible (on the threshold of being acceptable/unacceptable) 40 MHz: Audio is heavily distorted and marginally intelligible (unacceptable) –Running 1 Mbps (Both 20 MHz and 40 MHz) Audio quality is very good but do hear occasional dropouts (not often) AFH Enabled –Regular AFH –802.11n: No throughput throttling Audio quality was very good for both 20 MHz and 40 MHz With 40 MHz hear slightly higher number of dropouts –802.11n: 1 Mbps throughput. For both 20 MHz and 40 MHz: No audible effect

14 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 14 Test Setup #5.1: BT A2DP Equipment –Marvell BT Devices Setup similar to use-case 3 of [1] & [2]. Refer slide 4. AFH –Manual AFH

15 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 15 Test Setup #5.1: BT A2DP – No 802.11n throughput throttling – Qualitative Test Results AFH802.11 Mode 802.11 Throughput (Mbps)BT Performance OFFBaseline20 MHz: 98.6 (802.11n only) 40 MHz: 179.2 (802.11n only) Good audio quality, Rare blips (BT Only) OFF20 MHz87.3Lower number of blips- ~10% - Audio quality is good OFF40 MHz119Several blips and some dropouts - ~25% - Audio quality is not good ONBaseline20 MHz: 98.6 (802.11n only) 40 MHz: 179.2 (802.11n only) Good audio quality, Rare blips (BT Only) ON20 MHz96.5Good audio quality, Rare blips ON40 MHz176.7Good audio quality, Very few blips

16 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 16 Test Setup #5.1: BT A2DP – Varying Throughput – Qualitative Test Results AFH802.11 Mode 802.11 Throughput (Mbps)BT Performance OFFBaseline20 MHz: 98.6 (802.11n only) 40 MHz: 179.2 (802.11n only) Good audio quality, Rare blips (BT only) OFF20 MHz< 60 Mbps*Good audio quality, Very few blips OFF40 MHz< 90 Mbps*Good audio quality, Very few blips * Empirical search: Throughput was varied in steps of 5 Mbps

17 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 17 Test Setup #5.2: BT A2DP – Qualitative Tests Equipment –Plantronics Pulsar 590A headset and stereo adapter Setup similar to use-case 3 of [1] & [2]. Adjustments: 22 Mbps data rate not measured due to time constraints AFH –Regular AFH

18 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 18 Test Setup #5.2 : BT A2DP – Qualitative Test Results AFH Disabled –802.11n: No throughput throttling. For both 20 MHz and 40 MHz Lots of dropouts. Audio quality was not acceptable –1 Mbps (Both 20 MHz and 40 MHz) Audio quality is very good but hear dropouts occasionally AFH Enabled –802.11n: No throughput throttling 20 MHz: Periods of music and periods of dropouts. 40 MHz: Lots of dropouts. Audio quality was not acceptable –Regular AFH algorithm i.e. no manual blacklisting

19 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 19 Test Setup #5.3: BT A2DP Equipment –Plantronics Pulsar 590A headset and stereo adapter Setup similar to use-case 3 of [1] & [2]. Adjustments: Increased distance between 802.11 tx and BT tx to 1.5m 22 Mbps data rate not measured due to time constraints AFH –Regular AFH algorithm i.e. no manual blacklisting

20 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 20 Test Setup #5.3: BT A2DP – Qualitative Test Results AFH Disabled –802.11n: No throughput throttling 20 MHz: Audio quality is good but do hear blips 40 MHz: Audio quality is good but because of higher dropouts it is not acceptable AFH Enabled –802.11n: No throughput throttling 20 MHz: Audio quality is very good 40 MHz: Audio quality is good to very good with some blips

21 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 21 Discussion: Qualitative Test Results SCO –No tests were done with manual AFH –With regular AFH enabled, the audio went from unacceptable to near perfect A2DP –With regular AFH With distance between BT Tx and 802.11 Tx equal to 0.5 m, audio quality for both 20 MHz and 40 MHz was unacceptable With distance increased to 1.5 m, audio quality improved significantly for both 20 MHz and 40 MHz Note: The headset remained 0.5 m away from 802.11n Tx. This still emulates a user working on a laptop while listening to music and amounts to moving the BT tx (stereo) away by 1m –With manual AFH Audio quality is good in both 20 MHz and 40 MHz

22 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 22 References [1] “11n 40MHz BT test cases”, Eldad Perahia (Intel) et al –Available at https://mentor.ieee.org/802.11/file/08/11-08-0971-00- 000n-11n-40mhz-bt-test-cases.ppthttps://mentor.ieee.org/802.11/file/08/11-08-0971-00- 000n-11n-40mhz-bt-test-cases.ppt [2] “Bluetooth test cases for 802.11n 40 MHz”, John R. Barr (Motorola) et al –Available at https://mentor.ieee.org/802.11/file/08/11-08-0984-00- 000n-bluetooth-test-cases-for-802-11n-40-mhz.ppthttps://mentor.ieee.org/802.11/file/08/11-08-0984-00- 000n-bluetooth-test-cases-for-802-11n-40-mhz.ppt

23 doc.: IEEE 802.11-08/1140r0 Submission Backup Slides Setup, detailed test results etc.

24 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 24 Test Setup #1: SCO performance Baseline (AFH off) 11n 20MHz (AFH off) 11n 40MHz (AFH off) Baseline (AFH on) 11n 20MHz (AFH on) 11n 40MHz (AFH on) 3.412.121.544.284.274.28 3.6921.944.084.114 3.922.421.444.164.014.27 3.871.972.114.284.27 3.871.751.894.283.893.91 3.871.931.854.264.294.09 3.472.021.864.294.284.27 3.532.361.664.28 4.23 3.262.41.694.294.274.26 3.812.541.474.284.124.26 BT MOS Average 3.62.11.74.24.1 802.11n Mbps Throughput 98.4/178.468.8135.1498.4/178.494.7176

25 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 25 Test Setup #1: SCO performance with 1Mbps 11n Throughput Baseline (AFH off) 11n 20MHz (AFH off) 11n 40MHz (AFH off) Baseline (AFH on) 11n 20MHz (AFH on) 11n 40MHz (AFH on) 3.413.233.414.284.274.28 3.693.643.424.084.294 3.923.583.684.164.284.27 3.873.643.394.284.294.27 3.873.483.714.284.293.91 3.873.423.654.264.24.09 3.473.743.534.293.794.27 3.533.363.764.28 4.23 3.263.743.564.294.274.26 3.813.533.434.284.26 BT MOS Average 3.63.5 4.2 4.1 802.11n Mbps Throughput 1/111 11

26 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 26 Test Setup #2: ACL performance Baseline (AFH Off) 802.11n 20MHz (AFH off) 802.11n 40MHz (AFH off) Baseline (AFH on) 802.11n 20MHz (AFH on) 802.11n 40MHz (AFH on) 30915648313310274 30916346314312247 30715948316314262 317313259 BT Average (Kbps) 30815947315312.2260.5 802.11 Average (Mbps) 97.06/1756813297.06/17598.7174.5

27 doc.: IEEE 802.11-08/1140r0 SubmissionHarish Ramamurthy, Marvell Semiconductor Inc.Slide 27 Test Setup #2: ACL performance – 802.11n 1 Mbps throughput Baseline (AFH Off) 802.11n 20MHz (AFH off) 802.11n 40MHz (AFH off) Baseline (AFH on) 802.11n 20MHz (AFH on) 802.11n 40MHz (AFH on) 309303301313315312 309299302314 312 307304300316315310 317315311 BT Average (Kbps) 308302301315314311 802.11 Average (Mbps) 1/111 11

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